/* ============================================================
   文言智学 - 样式表
   设计系统 v1.0：新中式 · 书卷气 · 有温度
   依据 docs/specifications/界面设计规范_v1.0.md
   （Phase 1：设计 token 奠基；旧变量名保留别名，存量代码零破坏）
   ============================================================ */

/* --- 基础重置 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* ══════════════════════════════════════════════════════════
       文言智学 · 设计 token v1.0（新中式 · 书卷气）
       依据 docs/specifications/界面设计规范_v1.0.md
       ══════════════════════════════════════════════════════════ */

    /* —— 第一组：表面（Surfaces） —— */
    --color-bg-base:          #f5f3ef;   /* 宣纸白：主背景 */
    --color-surface-primary:  #ffffff;    /* 卡片/面板表面 */
    --color-surface-secondary:#faf8f5;    /* 次级表面（嵌套卡片/输入框） */
    --color-surface-tertiary: #f0ede7;    /* 三级表面（hover/分组背景） */
    --color-surface-elevated: #ffffff;    /* 浮层（modal/drawer/toast） */

    /* —— 第二组：文字（Text） —— */
    --color-text-primary:    #1a1a2a;     /* 墨色：正文主文字 */
    --color-text-secondary:  #4a4a5a;     /* 次要文字：说明、标签 */
    --color-text-tertiary:   #5f5f6f;     /* 辅助文字：placeholder、时间戳（WCAG AA ≥4.5:1） */
    --color-text-inverse:    #ffffff;     /* 反白文字 */
    --color-text-link:       #2d5f8a;     /* 靛蓝链接 */
    --color-text-on-accent:  #ffffff;     /* 强调色上的文字 */

    /* —— 第三组：品牌色（Brand） —— */
    --color-brand-ink:        #1a1a2a;    /* 墨：Logo、一级标题、主按钮实心 */
    --color-brand-vermilion:   #c53d43;    /* 朱砂：CTA、错误、重要标记 */
    --color-brand-jade:        #3d8b6e;    /* 竹青：成功、正确、正向进度 */
    --color-brand-gold:        #b8860b;    /* 琥珀：星级、徽章 */
    --color-brand-gold-light:  #f5e6c8;    /* 淡金：星级/徽章背景 */
    --color-brand-indigo:      #4a6fa5;    /* 靛蓝：AI、链接、科技感 */
    --color-brand-warm-gray:   #6b615c;    /* 暖灰：分割线、边框文字 */

    /* —— 第四组：语义状态色（Semantic） —— */
    --color-success:        #3d8b6e;
    --color-success-bg:     #edf7f2;
    --color-success-text:   #1a5c3a;
    --color-success-border: #a8d5bf;
    --color-error:          #c53d43;
    --color-error-bg:       #fdf2f1;
    --color-error-text:     #8b2529;
    --color-error-border:   #e8a8aa;
    --color-warning:        #c98226;
    --color-warning-bg:     #fef8ed;
    --color-warning-text:   #8b5e0f;
    --color-warning-border: #e8d4a0;
    --color-info:           #4a6fa5;
    --color-info-bg:        #f0f4fa;
    --color-info-text:      #2d4a70;
    --color-info-border:    #b8c8e0;

    /* —— 第五组：交互态（Interaction） —— */
    --color-hover-overlay:  rgba(26, 26, 42, 0.04);
    --color-press-overlay:  rgba(26, 26, 42, 0.08);
    --color-focus-ring:     rgba(74, 111, 165, 0.5);
    --color-disabled:       #c8c5c0;
    --color-disabled-bg:    #f0ede7;
    --color-overlay:        rgba(26, 26, 42, 0.5);

    /* —— 第六组：渐变（仅装饰） —— */
    --gradient-hero:       linear-gradient(135deg, #f5f3ef 0%, #ede9e1 50%, #f0ede7 100%);
    --gradient-gold-shine: linear-gradient(135deg, #d4a853 0%, #b8860b 100%);
    --gradient-progress:   linear-gradient(90deg, #3d8b6e 0%, #5ba88a 100%);

    /* —— 第七组：边框与阴影 —— */
    --border-default:  1px solid #e8e4dd;
    --border-strong:   1px solid #d4cfc5;
    --border-subtle:   1px solid #f0ede7;
    --shadow-xs:  0 1px 3px rgba(26, 26, 42, 0.04);
    --shadow-sm:  0 2px 8px rgba(26, 26, 42, 0.06);
    --shadow-md:  0 4px 16px rgba(26, 26, 42, 0.08);
    --shadow-lg:  0 8px 32px rgba(26, 26, 42, 0.12);
    --shadow-hover: 0 6px 20px rgba(26, 26, 42, 0.12); /* [修复C-02] hover态阴影 */
    --shadow-inner: inset 0 2px 4px rgba(26, 26, 42, 0.04);

    /* —— 第八组：字体 —— */
    --font-main:  'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', 'STSong', serif;
    --font-mono:  'JetBrains Mono', 'SF Mono', 'Consolas', 'Courier New', monospace;

    /* —— 第九组：字号阶梯（基准 16px / 1.25 Major Third） —— */
    --text-display:     48px;
    --text-h1:          28px;
    --text-h2:          22px;
    --text-h3:          18px;
    --text-body:        16px;
    --text-body-large:  17px;
    --text-body-small:  14px;
    --text-caption:     12px;
    --text-overline:    11px;

    /* —— 第十组：间距（8pt 基准） —— */
    --space-0:  0;
    --space-1:  4px;
    --space-2:  8px;
    --space-3:  12px;
    --space-4:  16px;
    --space-5:  20px;
    --space-6:  24px;
    --space-8:  32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;

    /* —— 第十一组：圆角 —— */
    --radius-sm:   6px;
    --radius-md:   10px;
    --radius-lg:   14px;
    --radius-xl:   20px;
    --radius-full: 9999px;

    /* —— 第十二组：过渡 —— */
    --transition-fast:   150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow:   500ms ease;

    /* ══════════════════════════════════════════════════════════
       旧变量名别名映射（兼容存量 435 行引用，勿删）
       ══════════════════════════════════════════════════════════ */
    --color-bg:            #f5f3ef;   /* → bg-base */
    --color-white:         #ffffff;   /* → surface-primary */
    --color-dark:          #1a1a2a;   /* → brand-ink */
    --color-text:          #1a1a2a;   /* → text-primary */
    --color-text-light:    #5f5f6f;   /* → text-tertiary（WCAG AA ≥4.5:1） */
    --color-gold:          #b8860b;   /* → brand-gold */
    --color-gold-text:     #8a5a12;
    --color-gold-light:    #f5e6c8;   /* → brand-gold-light */
    --color-border:        #e8e4dd;   /* → border-default */
    --color-card-bg:       #faf8f5;   /* → surface-secondary */
    --color-highlight:     #c53d43;   /* → brand-vermilion */
    --color-star:          #b8860b;   /* → brand-gold */
    --color-primary:       #4a6fa5;   /* → brand-indigo */
    --color-surface-alt:   #faf8f5;   /* → surface-secondary */
    --color-step-done:     #3d8b6e;   /* → brand-jade */
    --color-active-bg:     #f0ede7;   /* → surface-tertiary */
    --radius:              12px;      /* 保持原值，避免布局位移 */
    --shadow:              0 2px 8px rgba(26, 26, 42, 0.06);
    --transition:          background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, opacity 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease; /* [修复C-04] 避免transition:all性能问题 */
}

/* --- 暗色模式变量覆盖（暖黑底，非冷黑） --- */
[data-theme="dark"] {
    /* 表面 */
    --color-bg-base:          #1a1816;
    --color-surface-primary:  #242220;
    --color-surface-secondary:#1e1c1a;
    --color-surface-tertiary: #282624;
    --color-surface-elevated: #2a2826;

    /* 文字 */
    --color-text-primary:    #e8e4df;
    --color-text-secondary:  #b0aba3;
    --color-text-tertiary:   #9a948c;     /* WCAG AA on dark bg */
    --color-text-inverse:    #1a1a2a;
    --color-text-link:       #8eaad4;
    --color-text-on-accent:  #1a1a2a;

    /* 品牌色 */
    --color-brand-ink:        #e8e4df;
    --color-brand-vermilion:   #e0555b;
    --color-brand-jade:        #5dba94;
    --color-brand-gold:        #d4a84a;
    --color-brand-gold-light:  #3a3020;
    --color-brand-indigo:      #7a9fcf;
    --color-brand-warm-gray:   #6b655e;

    /* 语义态 */
    --color-success:        #5dba94;
    --color-success-bg:     #1a2e22;
    --color-success-text:   #7ed4a8;
    --color-success-border: #2e5a44;
    --color-error:          #e0555b;
    --color-error-bg:       #2e1a1a;
    --color-error-text:     #e88a8e;
    --color-error-border:   #5a2e2e;
    --color-warning:        #e8c06a;
    --color-warning-bg:     #2e2414;
    --color-warning-text:   #e8c06a;
    --color-warning-border: #5a4a2a;
    --color-info:           #7a9fcf;
    --color-info-bg:        #1a2030;
    --color-info-text:      #8eaad4;
    --color-info-border:    #2e3a52;

    /* 交互态 */
    --color-hover-overlay:  rgba(232, 228, 223, 0.06);
    --color-press-overlay:  rgba(232, 228, 223, 0.1);
    --color-focus-ring:     rgba(122, 159, 207, 0.6);
    --color-disabled:       #5a554e;
    --color-disabled-bg:    #282624;
    --color-overlay:        rgba(0, 0, 0, 0.7);

    /* 渐变 */
    --gradient-hero:       linear-gradient(135deg, #1a1816 0%, #201e1c 50%, #1a1816 100%);
    --gradient-gold-shine: linear-gradient(135deg, #d4a84a 0%, #b8860b 100%);
    --gradient-progress:   linear-gradient(90deg, #5dba94 0%, #7ed4a8 100%);

    /* 边框与阴影 */
    --border-default:  1px solid #4a463f;
    --border-strong:   1px solid #5a554e;
    --border-subtle:   1px solid #2e2c29;
    --shadow-xs:  0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-sm:  0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md:  0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg:  0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.35); /* [修复C-02] hover态阴影 */
    --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.2);

    /* 旧变量名别名映射（暗色值） */
    --color-bg:            #1a1816;
    --color-white:         #242220;
    --color-dark:          #e8e4df;
    --color-text:          #e8e4df;
    --color-text-light:    #9a948c;
    --color-gold:          #d4a84a;
    --color-gold-text:     #e8c476;
    --color-gold-light:    #3a3020;
    --color-border:        #4a463f;
    --color-card-bg:       #242220;
    --color-highlight:     #e0555b;
    --color-star:          #d4a84a;
    --color-primary:       #7a9fcf;
    --color-surface-alt:   #1e1c1a;
    --color-step-done:     #5dba94;
    --color-active-bg:     #2a2826;
    --radius:              12px;
    --shadow:              0 2px 8px rgba(0, 0, 0, 0.2);
    --transition:          background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, opacity 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease; /* [修复C-04] 避免transition:all性能问题 */
}

/* 尊重系统暗色偏好（未手动选择主题时自动跟随） */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]):not([data-theme="dark"]) {
        --color-bg-base:          #1a1816;
        --color-surface-primary:  #242220;
        --color-surface-secondary:#1e1c1a;
        --color-surface-tertiary: #282624;
        --color-surface-elevated: #2a2826;
        --color-text-primary:    #e8e4df;
        --color-text-secondary:  #b0aba3;
        --color-text-tertiary:   #9a948c;     /* 与 [data-theme="dark"] 一致，WCAG AA on dark bg */
        --color-text-inverse:    #1a1a2a;
        --color-text-link:       #8eaad4;
        --color-text-on-accent:  #1a1a2a;
        --color-brand-ink:        #e8e4df;
        --color-brand-vermilion:   #e0555b;
        --color-brand-jade:        #5dba94;
        --color-brand-gold:        #d4a84a;
        --color-brand-gold-light:  #3a3020;
        --color-brand-indigo:      #7a9fcf;
        --color-brand-warm-gray:   #6b655e;
        --color-success:        #5dba94;
        --color-success-bg:     #1a2e22;
        --color-success-text:   #7ed4a8;
        --color-success-border: #2e5a44;
        --color-error:          #e0555b;
        --color-error-bg:       #2e1a1a;
        --color-error-text:     #e88a8e;
        --color-error-border:   #5a2e2e;
        --color-warning:        #e8c06a;
        --color-warning-bg:     #2e2414;
        --color-warning-text:   #e8c06a;
        --color-warning-border: #5a4a2a;
        --color-info:           #7a9fcf;
        --color-info-bg:        #1a2030;
        --color-info-text:      #8eaad4;
        --color-info-border:    #2e3a52;
        --color-hover-overlay:  rgba(232, 228, 223, 0.06);
        --color-press-overlay:  rgba(232, 228, 223, 0.1);
        --color-focus-ring:     rgba(122, 159, 207, 0.6);
        --color-disabled:       #5a554e;
        --color-disabled-bg:    #282624;
        --color-overlay:        rgba(0, 0, 0, 0.7);
        --gradient-hero:       linear-gradient(135deg, #1a1816 0%, #201e1c 50%, #1a1816 100%);
        --gradient-gold-shine: linear-gradient(135deg, #d4a84a 0%, #b8860b 100%);
        --gradient-progress:   linear-gradient(90deg, #5dba94 0%, #7ed4a8 100%);
        --border-default:  1px solid #4a463f;
        --border-strong:   1px solid #5a554e;
        --border-subtle:   1px solid #2e2c29;
        --shadow-xs:  0 1px 3px rgba(0, 0, 0, 0.2);
        --shadow-sm:  0 2px 8px rgba(0, 0, 0, 0.2);
        --shadow-md:  0 4px 16px rgba(0, 0, 0, 0.3);
        --shadow-lg:  0 8px 32px rgba(0, 0, 0, 0.4);
        --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.35);
        --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.2);

        /* 旧变量名别名映射（暗色值） */
        --color-bg:            #1a1816;
        --color-white:         #242220;
        --color-dark:          #e8e4df;
        --color-text:          #e8e4df;
        --color-text-light:    #9a948c;
        --color-gold:          #d4a84a;
        --color-gold-text:     #e8c476;
        --color-gold-light:    #3a3020;
        --color-border:        #4a463f;
        --color-card-bg:       #242220;
        --color-highlight:     #e0555b;
        --color-star:          #d4a84a;
        --color-primary:       #7a9fcf;
        --color-surface-alt:   #1e1c1a;
        --color-step-done:     #5dba94;
        --color-active-bg:     #2a2826;
        --radius:              12px;
        --shadow:              0 2px 8px rgba(0, 0, 0, 0.2);
        --transition:          background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, opacity 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    }
}

body {
    font-family: var(--font-main);
    font-size: var(--text-body); /* C3 决策：正文基准 16px（界面设计规范_v1.0），中学生长时间阅读友好 */
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    min-height: 100vh;
    min-height: 100dvh;
}

/* --- 键盘可达性：统一焦点态（WCAG 2.4.7） --- */
:focus-visible {
    outline: 2px solid var(--color-focus-ring);
    outline-offset: 2px;
    border-radius: 4px;
}

/* --- 尊重「减少动态效果」系统偏好（WCAG 2.3.3） --- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}


/* --- 顶部导航 --- */
.header {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: baseline;
    gap: 12px;
    cursor: pointer;
    transition: opacity 0.2s ease;
    -webkit-user-select: none;
    user-select: none;
}

.logo:hover {
    opacity: 0.7;
}

.logo:active {
    opacity: 0.5;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 2px;
}

.logo-sub {
    font-size: 13px;
    color: var(--color-text-light);
}

.nav {
    display: flex;
    gap: 8px;
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 15px;
    padding: 8px 16px;
    border-radius: 8px;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-dark);
    background: var(--color-card-bg);
}

.nav-link.active {
    color: var(--color-dark);
    font-weight: 600;
    background: var(--color-card-bg);
}

/* --- 主题切换按钮 --- */
.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 18px;
    color: var(--color-text-secondary);
    transition: var(--transition);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: var(--color-surface-alt);
    color: var(--color-gold);
    border-color: var(--color-gold);
}

/* --- 汉堡菜单按钮 --- */
.hamburger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-direction: column;
    gap: 5px;
    z-index: 101;
}

.hamburger-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-dark);
    transition: var(--transition);
    border-radius: 2px;
}

/* --- 移动端导航遮罩 --- */
.mobile-nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 200;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-nav-overlay.open {
    display: block;
    opacity: 1;
}

/* --- 移动端导航菜单 --- */
.mobile-nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    height: 100dvh;
    background: var(--color-white);
    z-index: 201;
    transition: transform 0.3s ease;
    overflow-y: auto;
    transform: translateX(100%);
}

.mobile-nav.open {
    transform: translateX(0);
}

.mobile-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--color-border);
}

.mobile-nav-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-dark);
}

.mobile-nav-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 0 8px;
    line-height: 1;
}

.mobile-nav-link {
    display: block;
    padding: 16px 20px;
    text-decoration: none;
    color: var(--color-text);
    font-size: 16px;
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition);
}

.mobile-nav-link:active {
    background: var(--color-card-bg);
}

.mobile-nav-link.active {
    color: var(--color-dark);
    font-weight: 600;
    background: var(--color-card-bg);
    border-left: 3px solid var(--color-gold);
}

/* --- 主内容区 --- */
.main {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* --- 首页：搜索英雄区（简化，去掉了独立hero，融入首页） --- */
.home-search {
    text-align: center;
    padding: 32px 0 24px;
}

.home-search-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 20px;
    letter-spacing: 2px;
    font-family: var(--font-serif);
}

/* --- 搜索框 --- */
.search-box {
    display: flex;
    justify-content: center;
    gap: 12px;
    max-width: 480px;
    margin: 0 auto;
}

.search-input {
    flex: 1;
    height: 56px;
    padding: 0 24px;
    font-size: 20px;
    font-family: var(--font-serif);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-white);
    color: var(--color-text);
    outline: none;
    transition: var(--transition);
    text-align: center;
    letter-spacing: 8px;
}

.search-input:focus {
    border-color: var(--color-dark);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
}

.search-input::placeholder {
    font-size: 14px;
    letter-spacing: 2px;
    color: var(--color-text-light);
}

.search-btn {
    height: 56px;
    padding: 0 32px;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-white);
    background: var(--color-dark);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.search-btn:hover {
    background: #34495e;
}

.search-hint {
    margin-top: 16px;
    font-size: 14px;
    color: var(--color-highlight);
    min-height: 20px;
}

/* --- 搜索结果 --- */
.search-result {
    padding: 0 0 40px;
}

/* === 同音字列表（拼音查询结果） === */
.homonym-list {
    padding: 0 0 24px;
    animation: fadeInUp 0.4s ease;
}

.homonym-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    padding: 0 4px;
}

.homonym-items {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.homonym-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    min-width: 80px;
    padding: 16px 12px;
    background: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 2px solid transparent;
}

.homonym-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: var(--color-primary);
}

.homonym-item:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.homonym-char {
    font-size: 36px;
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--color-dark);
}

.homonym-pinyin {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.homonym-star {
    font-size: 12px;
    color: var(--color-star);
}

.result-card {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
    animation: fadeInUp 0.4s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-header {
    display: flex;
    align-items: center;
    gap: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 32px;
}

.result-char {
    font-size: 72px;
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--color-dark);
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-card-bg);
    border-radius: var(--radius);
    flex-shrink: 0;
}

.result-meta {
    flex: 1;
}

.result-pinyin {
    font-size: 22px;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.result-star {
    font-size: 20px;
    color: var(--color-star);
    margin-bottom: 4px;
}

.result-star.word-badge {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1px;
    color: #fff;
    background: linear-gradient(135deg, #c9a86a, #a07b3c);
    padding: 3px 12px;
    border-radius: 999px;
    margin-bottom: 6px;
}

.result-freq {
    font-size: 14px;
    color: var(--color-text-light);
}

/* --- 义项列表 --- */
.result-meanings {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.meaning-item {
    padding: 20px 24px;
    background: var(--color-card-bg);
    border-radius: var(--radius);
    border-left: 4px solid var(--color-border);
    transition: var(--transition);
}

.meaning-item:hover {
    border-left-color: var(--color-dark);
}

.meaning-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.meaning-seq {
    width: 28px;
    height: 28px;
    background: var(--color-dark);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    flex-shrink: 0;
}

.meaning-content {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-dark);
}

.meaning-example {
    margin-top: 8px;
    padding-left: 40px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

/* 每条例句独立成行；行首展示册次（如「九上」）与出处，不贴来源类别签（方案A，遵循收录原则6.4） */
.eg-line {
    display: flex;
    align-items: baseline;
    gap: 8px;
    font-size: 15px;
    color: var(--color-text-secondary);
    font-family: var(--font-serif);
    line-height: 1.9;
}

/* 册次标签（方案A，2026-07-10）：中性样式，仅提示教材册次（如「九上」），
   不做来源类别着色判定；严禁标注「常用」「教材」等类别签 */
.eg-grade {
    flex-shrink: 0;
    font-family: var(--font-main, sans-serif);
    font-size: 11px;
    font-weight: 600;
    line-height: 1.4;
    padding: 2px 7px;
    border-radius: 8px;
    align-self: flex-start;
    margin-top: 4px;
    letter-spacing: 0.5px;
    color: #666;
    background: rgba(128, 128, 128, 0.10);
    border: 1px solid rgba(128, 128, 128, 0.22);
}

.eg-source {
    flex-shrink: 0;
    font-family: var(--font-main, sans-serif);
    font-size: 12px;
    color: #6b5530;
    background: rgba(138, 109, 59, 0.10);
    padding: 1px 8px;
    border-radius: 10px;
    white-space: nowrap;
    align-self: flex-start;
    margin-top: 4px;
}

.eg-text {
    flex: 1;
}

.eg-empty {
    color: #6b6558;
    font-style: italic;
}

/* --- 热门字 --- */
.hot-words {
    padding: 40px 0 60px;
}

.hot-words h2 {
    font-size: 18px;
    color: var(--color-text-light);
    font-weight: 400;
    margin-bottom: 20px;
}

.hot-words-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.hot-word-btn {
    width: 56px;
    height: 56px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.hot-word-btn:hover {
    border-color: var(--color-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.hot-word-char {
    font-size: 22px;
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--color-dark);
    line-height: 1.2;
}

.hot-word-star {
    font-size: 10px;
    color: var(--color-star);
    line-height: 1;
}

/* --- 高频字表页 --- */
.rank-header {
    text-align: center;
    padding: 60px 0 40px;
}

.rank-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 12px;
}

.rank-header p {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.rank-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-btn {
    padding: 8px 16px;
    font-size: 14px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--color-dark);
}

.filter-btn.active {
    background: var(--color-dark);
    color: var(--color-white);
    border-color: var(--color-dark);
}

/* --- 字表 --- */
.rank-table {
    padding-bottom: 60px;
}

.rank-row {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    background: var(--color-white);
    border-radius: var(--radius);
    margin-bottom: 8px;
    transition: var(--transition);
    cursor: pointer;
}

.rank-row:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.rank-num {
    width: 40px;
    font-size: 14px;
    color: var(--color-text-light);
    font-weight: 600;
}

.rank-char {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--color-dark);
    background: var(--color-card-bg);
    border-radius: 8px;
    margin-right: 16px;
    flex-shrink: 0;
}

.rank-info {
    flex: 1;
}

.rank-pinyin {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.rank-star {
    color: var(--color-star);
    font-size: 16px;
}

.rank-freq {
    font-size: 13px;
    color: var(--color-text-light);
    margin-left: auto;
    padding-left: 16px;
}

/* --- 关于页 --- */
.about-content {
    padding: 60px 0;
}

.about-content h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 40px;
    text-align: center;
}

.about-card {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.about-card h2 {
    font-size: 18px;
    color: var(--color-dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-border);
}

.about-card p {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    line-height: 2;
}

/* [v2.1新增] 首页"关于"入口（简洁文字链接） */
.home-about-entry {
    text-align: center;
    padding: 24px 0 16px;
    max-width: 860px;
    margin: 0 auto;
}
.home-about-link {
    font-size: 14px;
    color: var(--color-text-tertiary);
    text-decoration: none;
    transition: color 0.2s;
}
.home-about-link:hover {
    color: var(--color-text-link);
}

/* [v2.1新增] 关于页面样式 */
/* 规范依据：docs/specifications/关于页面开发规范_v1.0.md 第三章 */
.about-page-wrapper {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 24px 48px;
}
.about-page-wrapper .btn-back-home {
    display: inline-block;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: 14px;
    cursor: pointer;
    padding: 16px 0;
    transition: color 0.2s;
}
.about-page-wrapper .btn-back-home:hover {
    color: var(--color-brand-vermilion);
}
.about-page-header {
    text-align: center;
    padding: 32px 24px 48px;
}
.about-page-title {
    font-family: var(--font-serif);
    font-size: 28px;
    font-weight: 700;
    color: var(--color-brand-ink);
    margin: 0 0 8px;
    letter-spacing: 2px;
}
.about-page-subtitle {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin: 0;
}
.about-page-container {
    /* 章节卡片容器 */
}
.about-page-footer {
    text-align: center;
    font-size: 13px;
    color: var(--color-text-tertiary);
    padding: 48px 0 16px;
}

/* --- 章节卡片 --- */
.about-card {
    max-width: 720px;
    margin: 0 auto 32px;
    padding: 32px 28px;
    background: var(--color-surface-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border-left: 3px solid var(--color-brand-vermilion);
    /* 滚动入场动效：初始隐藏 */
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 300ms ease-out, transform 300ms ease-out;
}
.about-card--visible {
    opacity: 1;
    transform: translateY(0);
}
.about-card--hero {
    padding-top: 40px;
}
.about-card-number {
    font-size: 20px;
    color: var(--color-brand-vermilion);
    margin-bottom: 8px;
    line-height: 1;
}
.about-card-title {
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 600;
    color: var(--color-brand-ink);
    margin: 0 0 20px;
    padding-bottom: 12px;
    border-bottom: var(--border-default);
}
.about-card--hero .about-card-title {
    font-size: 20px;
}
.about-card--hero .about-card-body::first-letter {
    font-size: 3.2em;
    float: left;
    line-height: 0.8;
    margin-right: 8px;
    margin-top: 4px;
    color: var(--color-brand-vermilion);
    font-family: var(--font-serif);
    font-weight: 700;
}
.about-card-body {
    font-size: 15px;
    line-height: 1.85;
    color: var(--color-text-primary);
}
.about-card-body p {
    margin: 0 0 14px;
}
.about-card-body p:last-child {
    margin-bottom: 0;
}
.about-card-body strong {
    font-weight: 600;
    color: var(--color-brand-ink);
}

/* --- 数据指标网格（data 类型章节） --- */
.about-metrics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 0 0 24px;
}
.about-metric-item {
    background: var(--color-surface-secondary);
    border-radius: var(--radius-md);
    padding: 20px 16px;
    text-align: center;
}
.about-metric-value {
    font-family: var(--font-serif);
    font-size: 32px;
    font-weight: 700;
    color: var(--color-brand-ink);
    line-height: 1.1;
    margin-bottom: 6px;
}
.about-metric-unit {
    font-size: 16px;
    font-weight: 400;
}
.about-metric-label {
    font-size: 13px;
    color: var(--color-text-tertiary);
}

/* --- 六步翻译法标签行（method 类型） --- */
.about-steps-row {
    font-family: var(--font-serif);
    font-size: 16px;
    letter-spacing: 0.15em;
    color: var(--color-brand-vermilion);
    text-align: center;
    padding: 12px 0 20px;
    font-weight: 600;
}

/* --- 收束章节三关键词（closing 类型） --- */
.about-keywords {
    font-family: var(--font-serif);
    font-size: 20px;
    color: var(--color-brand-vermilion);
    text-align: center;
    padding: 20px 0 8px;
    letter-spacing: 0.1em;
    font-weight: 600;
}

/* --- 关于页面响应式 --- */
@media (max-width: 768px) {
    .about-page-wrapper {
        padding: 0 16px 32px;
    }
    .about-card {
        padding: 24px 20px;
        margin-bottom: 24px;
    }
    .about-metrics-grid {
        gap: 8px;
    }
    .about-metric-value {
        font-size: 24px;
    }
    .about-page-title {
        font-size: 24px;
    }
    .about-page-header {
        padding: 24px 16px 32px;
    }
}
@media (max-width: 480px) {
    .about-page-header {
        padding: 16px 16px 24px;
    }
    .about-card {
        padding: 20px 16px;
    }
    /* 移动端去掉 Drop Cap 效果 */
    .about-card--hero .about-card-body::first-letter {
        font-size: inherit;
        float: none;
        margin: 0;
        color: inherit;
        font-family: inherit;
        font-weight: inherit;
    }
}

/* --- 底部 --- */
.footer {
    text-align: center;
    padding: 40px 24px;
    border-top: 1px solid var(--color-border);
    margin-top: 40px;
}

.footer p {
    font-size: 14px;
    color: var(--color-text-light);
}

.footer-sub {
    margin-top: 8px;
    font-size: 13px;
}

/* --- 无结果 --- */
.no-result {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-light);
}

.no-result-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.no-result-text {
    font-size: 16px;
}

.no-result-hint {
    font-size: 13px;
    color: var(--color-text-light);
    margin-top: 8px;
}

/* --- 加载状态 --- */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--color-text-light);
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-dark);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 8px;
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* --- 六步翻译法页 --- */
.translate-hero {
    text-align: center;
    padding: 60px 0 40px;
}

.translate-hero h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 12px;
}

.translate-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
}

/* 句子选择器 */
.sentence-selector {
    padding-bottom: 40px;
}

.sentence-selector h2 {
    font-size: 18px;
    color: var(--color-text-light);
    font-weight: 400;
    margin-bottom: 20px;
}

.sentence-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sentence-item {
    display: flex;
    align-items: center;
    padding: 20px 24px;
    background: var(--color-white);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

.sentence-item:hover {
    border-color: var(--color-dark);
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.sentence-text {
    font-size: 20px;
    font-family: var(--font-serif);
    font-weight: 600;
    color: var(--color-dark);
    letter-spacing: 2px;
}

.sentence-source {
    margin-left: auto;
    font-size: 13px;
    color: var(--color-text-light);
    padding-left: 16px;
    white-space: nowrap;
}

/* 翻译工作区 */
.translate-workspace {
    padding-bottom: 60px;
}

/* 原文展示 */
.translate-source {
    text-align: center;
    padding: 40px;
    background: var(--color-white);
    border-radius: var(--radius);
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}

.source-sentence {
    font-size: 32px;
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 6px;
    margin-bottom: 8px;
}

.source-from {
    font-size: 14px;
    color: var(--color-text-light);
}

/* 步骤进度条 */
.step-progress {
    display: flex;
    gap: 4px;
    margin-bottom: 24px;
}

.step-dot {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--color-border);
    transition: var(--transition);
    position: relative;
}

.step-dot.active {
    background: var(--color-dark);
}

.step-dot.completed {
    background: var(--color-gold);
}

.step-dot-label {
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    color: var(--color-text-light);
    white-space: nowrap;
}

/* 步骤卡片 */
.step-card {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    animation: fadeInUp 0.4s ease;
}

.step-card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.step-card-num {
    width: 44px;
    height: 44px;
    background: var(--color-dark);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    flex-shrink: 0;
}

.step-card-name {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-dark);
}

.step-card-instruction {
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    padding: 20px 24px;
    background: linear-gradient(135deg, var(--color-card-bg) 0%, var(--color-white) 100%);
    border-radius: 12px;
    margin-bottom: 24px;
    border: 1px solid var(--color-border);
    position: relative;
}

.step-card-instruction::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    bottom: 12px;
    width: 4px;
    background: var(--color-gold);
    border-radius: 0 3px 3px 0;
}

/* 回答区域 */
.answer-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.answer-input {
    width: 100%;
    min-height: 120px;
    padding: 18px 20px;
    font-size: 16px;
    font-family: var(--font-main);
    border: 1.5px solid var(--color-border);
    border-radius: 12px;
    background: var(--color-white);
    color: var(--color-text);
    outline: none;
    resize: none;
    transition: var(--transition);
    line-height: 1.8;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.04);
}

.answer-input:focus {
    border-color: var(--color-gold);
    box-shadow: 0 0 0 4px rgba(201, 169, 108, 0.12), inset 0 1px 3px rgba(0, 0, 0, 0.04);
}

.answer-input::placeholder {
    color: var(--color-text-light);
    font-size: 14px;
}

.answer-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

/* 步骤卡片按钮区 */
.step-card-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 20px;
}

.btn-primary {
    padding: 12px 32px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-white);
    background: var(--color-dark);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background: #34495e;
}

.btn-secondary {
    padding: 12px 32px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-dark);
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    border-color: var(--color-dark);
}

/* 参考答案 */
.reference-answer {
    margin-top: 16px;
    padding: 16px 20px;
    background: var(--color-warning-bg);
    border-left: 4px solid var(--color-gold);
    border-radius: 0 8px 8px 0;
    animation: fadeInUp 0.3s ease;
}

.reference-answer-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-gold-text);
    margin-bottom: 8px;
}

.reference-answer-text {
    font-size: 15px;
    color: var(--color-text);
    line-height: 1.8;
}

/* 详细解析 */
.step-card-explanation {
    margin-top: 24px;
    padding: 20px 24px;
    background: var(--color-info-bg);
    border-left: 4px solid var(--color-info);
    border-radius: 0 8px 8px 0;
    animation: fadeInUp 0.3s ease;
}

.explanation-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-info);
    margin-bottom: 8px;
}

/* 已完成步骤历史（累积式） */
.step-history {
    margin-bottom: 8px;
}

.step-history-item {
    margin-bottom: 12px;
    border-radius: 12px;
    overflow: hidden;
    animation: fadeInUp 0.3s ease;
}

.step-history-item .step-history-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
    transition: background 0.2s;
}

.step-history-item .step-history-header:hover {
    background: rgba(0,0,0,0.03);
}

.step-history-header .history-step-num {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-success-bg);
    color: var(--color-step-done);
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.step-history-header .history-step-name {
    font-weight: 600;
    font-size: 14px;
    color: var(--color-step-done);
}

.step-history-header .history-step-result {
    flex: 1;
    text-align: right;
    font-size: 13px;
    color: #666;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 50%;
}

.step-history-header .history-eval-badge {
    font-size: 12px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
    flex-shrink: 0;
}

.step-history-header .history-eval-badge.correct {
    background: var(--color-success-bg);
    color: var(--color-step-done);
}

.step-history-header .history-eval-badge.partial {
    background: #fff8e1;
    color: #f57f17;
}

.step-history-header .history-eval-badge.incorrect {
    background: #fce4ec;
    color: #c62828;
}

.step-history-header .history-eval-badge.skipped {
    background: #f5f5f5;
    color: #9e9e9e;
}

.step-history-header .history-toggle {
    font-size: 12px;
    color: var(--color-text-light);
    transition: transform 0.2s;
    flex-shrink: 0;
}

.step-history-item.expanded .history-toggle {
    transform: rotate(180deg);
}

.step-history-body {
    display: none;
    padding: 0 16px 16px;
    border-top: 1px solid #f0f0f0;
}

.step-history-item.expanded .step-history-body {
    display: block;
}

.step-history-section {
    margin-top: 12px;
    font-size: 13px;
    line-height: 1.7;
    color: #555;
}

.step-history-section .section-label {
    font-weight: 600;
    color: #333;
    margin-bottom: 2px;
}

.step-history-section.user-answer-text {
    background: #fafafa;
    padding: 8px 12px;
    border-radius: 6px;
    border-left: 3px solid #aaa;
    white-space: pre-wrap;
}

.step-history-section.reference-text {
    background: var(--color-info-bg);
    padding: 8px 12px;
    border-radius: 6px;
    border-left: 3px solid var(--color-info);
}

.step-history-section.explanation-text {
    background: var(--color-surface-alt);
    padding: 8px 12px;
    border-radius: 6px;
}

/* 前序步骤参考答案摘要（当前步骤卡片顶部） */
.prior-steps-summary {
    padding: 12px 16px;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #f6f8fa 0%, #eef2f7 100%);
    border-radius: 10px;
    border: 1px solid #e0e6ed;
    font-size: 13px;
    line-height: 1.7;
}

.prior-steps-summary .summary-sentence {
    font-size: 18px;
    font-weight: 700;
    color: #1a1a2e;
    padding: 8px 0 10px;
    border-bottom: 1px solid #d0d7e2;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.prior-steps-summary .summary-title {
    font-weight: 600;
    font-size: 12px;
    color: #6c7a89;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.prior-steps-summary .summary-item {
    display: flex;
    align-items: baseline;
    gap: 6px;
    padding: 3px 0;
}

.prior-steps-summary .summary-step-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 4px;
    background: var(--color-success-bg);
    color: var(--color-step-done);
    font-size: 11px;
    font-weight: 700;
    flex-shrink: 0;
}

.prior-steps-summary .summary-step-name {
    font-weight: 600;
    color: var(--color-step-done);
    flex-shrink: 0;
}

.prior-steps-summary .summary-answer {
    color: #444;
    word-break: break-all;
}

.prior-steps-summary .summary-divider {
    height: 1px;
    background: #e0e6ed;
    margin: 4px 0;
}

/* 历史卡片折叠时降低视觉权重 */
.step-history-item {
    opacity: 0.7;
    transition: opacity 0.2s;
}

.step-history-item:hover {
    opacity: 1;
}

.explanation-content {
    font-size: 15px;
    color: var(--color-text);
    line-height: 2;
}

/* 最终翻译结果 */
.final-result {
    animation: fadeInUp 0.5s ease;
}

.final-card {
    text-align: center;
    padding: 48px 40px;
    background: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.final-card h2 {
    font-size: 24px;
    color: var(--color-dark);
    margin-bottom: 32px;
}

.final-original {
    font-size: 28px;
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 4px;
    padding: 20px;
    background: var(--color-card-bg);
    border-radius: 8px;
}

.final-arrow {
    font-size: 28px;
    color: var(--color-gold-text);
    margin: 16px 0;
}

.final-translated {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
    padding: 20px;
    background: var(--color-warning-bg);
    border-radius: 8px;
    border: 1px solid var(--color-gold-light);
}

.final-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 32px;
}

/* --- 六步翻译法：模式选择卡片 --- */
.translate-modes {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 0 20px 40px;
}

.translate-mode-card {
    background: var(--color-card-bg);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--color-border);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.translate-mode-card:hover {
    border-color: var(--color-gold-text);
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.translate-mode-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-dark);
    margin: 0 0 6px 0;
}

.translate-mode-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin: 0 0 14px 0;
    line-height: 1.5;
}

.free-input-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 16px;
    font-family: var(--font-serif);
    resize: vertical;
    margin-bottom: 12px;
    transition: border-color 0.2s;
}

.free-input-textarea:focus {
    outline: none;
    border-color: var(--color-gold-text);
}

.btn-start-translate {
    width: 100%;
}

/* --- 六步翻译法：课文面板 --- */
.text-panel {
    background: var(--color-card-bg);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--color-border);
    margin-bottom: 20px;
}

.text-panel-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
}

.text-panel-content {
    font-size: 15px;
    line-height: 2;
    color: var(--color-dark);
    font-family: var(--font-serif);
}

.text-panel-content .text-sentence {
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
}

.text-panel-content .text-sentence:hover {
    background: var(--color-bg);
}

.text-panel-content .text-sentence.active {
    background: var(--color-gold-light);
    color: var(--color-gold-text);
    font-weight: 600;
}

.text-panel-content .text-sentence.completed {
    background: var(--color-success-bg);
}

.text-panel-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--color-border);
}

.text-progress {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.btn-sm {
    font-size: 13px;
    padding: 6px 14px;
}

/* --- 六步翻译法：返回按钮和loading --- */
.btn-back-to-modes {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: 14px;
    cursor: pointer;
    padding: 8px 0;
    margin-bottom: 16px;
    transition: color 0.2s;
}

.btn-back-to-modes:hover {
    color: var(--color-dark);
}

.analyze-loading {
    text-align: center;
    padding: 60px 20px;
}

.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-gold-text);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 15px;
    color: var(--color-text-secondary);
}

/* --- 六步翻译法：工作区布局 --- */
.translate-workspace {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px 40px;
}

.translate-main {
    background: var(--color-card-bg);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--color-border);
}

/* --- 六步翻译法：AI评价反馈 --- */
.step-card-feedback {
    margin-top: 20px;
    padding: 20px 24px;
    border-radius: 12px;
    border: 1px solid var(--color-border);
    background: var(--color-white);
    animation: fadeInUp 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.feedback-evaluation {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feedback-evaluation.correct { background: var(--color-success-bg); color: var(--color-success-text); }
.feedback-evaluation.partial { background: var(--color-warning-bg); color: var(--color-warning-text); }
.feedback-evaluation.incorrect { background: var(--color-error-bg); color: var(--color-error-text); }

.feedback-text {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.feedback-hint {
    font-size: 14px;
    color: var(--color-text-secondary);
    font-style: italic;
}

/* --- 六步翻译法：最终评分 --- */
.final-score {
    margin-top: 24px;
    padding: 20px;
    background: var(--color-card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

.score-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 12px;
}

.score-steps {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.score-step-item {
    flex: 1;
    text-align: center;
    padding: 8px 4px;
    border-radius: 8px;
    font-size: 12px;
    line-height: 1.5;
}

.score-step-name {
    font-weight: 600;
    margin-bottom: 2px;
}

.score-step-item.correct { background: var(--color-success-bg); color: var(--color-success-text); }
.score-step-item.partial { background: var(--color-warning-bg); color: var(--color-warning-text); }
.score-step-item.incorrect { background: var(--color-error-bg); color: var(--color-error-text); }
.score-step-item.skipped { background: #e2e3e5; color: #6c757d; }
.score-step-item.early-finish { background: #d1ecf1; color: #0c5460; }

.score-total {
    font-size: 20px;
    font-weight: 700;
    text-align: center;
    color: var(--color-gold-text);
}

/* --- 六步翻译法：AI综合点评 --- */
.final-ai-comment {
    margin-top: 16px;
    padding: 16px 20px;
    background: var(--color-card-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    animation: fadeInUp 0.3s ease;
}

.ai-comment-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.ai-comment-text {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-dark);
}

/* --- 词语练习页 --- */
.practice-hero {
    text-align: center;
    padding: 60px 0 40px;
}

.practice-hero h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 12px;
}

.practice-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
}

.practice-config {
    display: flex;
    gap: 24px;
    padding-bottom: 60px;
}

.config-card {
    flex: 2;
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
}

.config-card h2 {
    font-size: 18px;
    color: var(--color-dark);
    margin-bottom: 20px;
}

.stats-card {
    flex: 1;
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
}

.stats-card h2 {
    font-size: 18px;
    color: var(--color-dark);
    margin-bottom: 20px;
}

/* 模式选择 */
.mode-selector {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 28px;
}

.mode-card {
    padding: 20px 16px;
    text-align: center;
    background: var(--color-card-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.mode-card:hover {
    border-color: var(--color-dark);
    transform: translateY(-2px);
}

.mode-card.active {
    border-color: var(--color-dark);
    background: var(--color-active-bg);
}

.mode-icon {
    font-size: 28px;
    margin-bottom: 8px;
}

.mode-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 4px;
}

.mode-desc {
    font-size: 12px;
    color: var(--color-text-light);
}

/* 配置行 */
.config-row {
    margin-bottom: 24px;
}

.config-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 12px;
}

.count-selector {
    display: flex;
    gap: 8px;
}

.count-btn {
    flex: 1;
    padding: 10px 0;
    font-size: 14px;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.count-btn:hover {
    border-color: var(--color-dark);
}

.count-btn.active {
    border-color: var(--color-dark);
    background: var(--color-dark);
    color: var(--color-white);
}

.count-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    border-color: var(--color-border);
    background: var(--color-white);
    color: var(--color-text-light);
}

/* 内联返回按钮（用于子页面顶部） */
.btn-back-inline {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    margin-bottom: 16px;
    font-size: 14px;
    color: var(--color-text-secondary);
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.btn-back-inline:hover {
    color: var(--color-dark);
    border-color: var(--color-dark);
    background: rgba(0, 0, 0, 0.02);
}

/* 标签选择 */
.tag-selector {
    margin-bottom: 24px;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-item {
    padding: 6px 14px;
    font-size: 13px;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.tag-item:hover {
    border-color: var(--color-dark);
}

.tag-item.active {
    background: var(--color-dark);
    color: var(--color-white);
    border-color: var(--color-dark);
}

/* 题型筛选器 */
.type-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.type-item {
    padding: 6px 14px;
    font-size: 13px;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.type-item:hover {
    border-color: var(--color-dark);
}

.type-item.active {
    background: var(--color-dark);
    color: var(--color-white);
    border-color: var(--color-dark);
}

/* 年级筛选器 */
.grade-selector {
    margin-bottom: 24px;
}

.grade-selector .config-label {
    display: flex;
    align-items: center;
    gap: 8px;
}

.grade-selector .config-label::before {
    content: '📚';
}

.grade-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.grade-item {
    padding: 8px 16px;
    font-size: 14px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
    -webkit-user-select: none;
    user-select: none;
}

.grade-item:hover {
    border-color: var(--color-dark);
    background: var(--color-card-bg);
}

.grade-item.active {
    background: var(--color-dark);
    color: var(--color-white);
    border-color: var(--color-dark);
}

/* 课文筛选器 */
.text-selector {
    margin-bottom: 24px;
}

.text-selector .config-label {
    display: flex;
    align-items: center;
    gap: 8px;
}

.text-selector .config-label::before {
    content: '📖';
}

.text-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    max-height: 200px;
    overflow-y: auto;
    padding-right: 8px;
}

.text-list::-webkit-scrollbar {
    width: 4px;
}

.text-list::-webkit-scrollbar-track {
    background: var(--color-border);
    border-radius: 2px;
}

.text-list::-webkit-scrollbar-thumb {
    background: var(--color-text-light);
    border-radius: 2px;
}

.text-item {
    padding: 6px 14px;
    font-size: 13px;
    border: 1px solid var(--color-border);
    border-radius: 20px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
    -webkit-user-select: none;
    user-select: none;
}

.text-item:hover {
    border-color: var(--color-dark);
}

.text-item.active {
    background: var(--color-dark);
    color: var(--color-white);
    border-color: var(--color-dark);
}

/* 多选状态样式 */
.multi-select .grade-item.active,
.multi-select .text-item.active {
    position: relative;
    padding-left: 32px;
}

.multi-select .grade-item.active::before,
.multi-select .text-item.active::before {
    content: '✓';
    position: absolute;
    left: 10px;
    font-size: 12px;
    font-weight: 700;
}

/* 词频选择器 */
.freq-selector {
    margin-bottom: 24px;
}

.freq-selector .config-row {
    margin-bottom: 16px;
}

.freq-source-toggle {
    display: flex;
    gap: 8px;
}

.freq-source-btn {
    flex: 1;
    padding: 10px 0;
    font-size: 14px;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.freq-source-btn:hover {
    border-color: var(--color-dark);
}

.freq-source-btn.active {
    border-color: var(--color-dark);
    background: var(--color-dark);
    color: var(--color-white);
}

.freq-tier-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.freq-tier-btn {
    padding: 8px 16px;
    font-size: 13px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
    -webkit-user-select: none;
    user-select: none;
}

.freq-tier-btn:hover {
    border-color: var(--color-dark);
    background: var(--color-card-bg);
}

.freq-tier-btn.active {
    background: var(--color-dark);
    color: var(--color-white);
    border-color: var(--color-dark);
}

.freq-preview {
    margin-top: 8px;
}

.freq-preview-info {
    font-size: 13px;
    color: var(--color-text-secondary);
    padding: 10px 14px;
    background: var(--color-card-bg);
    border-radius: 8px;
}

.freq-preview-source {
    font-weight: 600;
    color: var(--color-dark);
}

.freq-preview-tier {
    font-weight: 600;
    color: var(--color-dark);
}

.freq-preview-count {
    font-weight: 600;
    color: var(--color-primary, #2563eb);
}

.btn-large {
    width: 100%;
    padding: 16px;
    font-size: 16px;
}

/* 统计网格 */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.stat-item {
    text-align: center;
    padding: 16px 8px;
    background: var(--color-card-bg);
    border-radius: 8px;
}

.stat-num {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 4px;
}

.stat-num.stat-correct {
    color: var(--color-success);
}

.stat-num.stat-wrong {
    color: var(--color-error);
}

.stat-num.stat-rate {
    color: var(--color-gold-text);
}

.stat-label {
    font-size: 12px;
    color: var(--color-text-light);
}

/* ===== 练习配置区 · 新中式书卷气 token 重做（覆盖上方旧别名规则） ===== */
.practice-config { padding-bottom: 60px; }

/* 首屏：两级入口 */
.practice-entry { display: flex; gap: var(--space-6); align-items: flex-start; }
.entry-main { flex: 2; display: flex; flex-direction: column; gap: var(--space-4); }
.entry-card { position: relative; border-radius: var(--radius-lg); padding: var(--space-6) var(--space-8); box-shadow: var(--shadow-md); cursor: default; transition: transform var(--transition-normal), box-shadow var(--transition-normal); }
.entry-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.entry-card--smart { background: var(--gradient-gold-shine); color: var(--color-text-on-accent); border: none; }
.entry-card--smart .entry-title,
.entry-card--smart .entry-desc,
.entry-card--smart .smart-preview-line { color: var(--color-text-on-accent); }
.entry-card--manual { background: var(--color-surface-primary); border: var(--border-default); color: var(--color-text-primary); }
.entry-badge { position: absolute; top: var(--space-5); right: var(--space-6); background: var(--gradient-gold-shine); color: var(--color-text-on-accent); font-size: var(--text-caption); font-weight: 700; letter-spacing: 0.5px; padding: 4px 12px; border-radius: var(--radius-full); box-shadow: var(--shadow-sm); }
.entry-title { font-family: var(--font-serif); font-size: var(--text-h2); font-weight: 700; margin-bottom: var(--space-2); }
.entry-desc { font-family: var(--font-main); font-size: var(--text-body); line-height: 1.6; opacity: 0.92; margin-bottom: var(--space-4); }
.smart-preview { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-family: var(--font-main); font-size: var(--text-body-small); margin-bottom: var(--space-4); }
.smart-preview-line { font-weight: 500; }
.smart-preview-line strong { font-size: var(--text-body); font-weight: 700; }
.smart-preview-sep { opacity: 0.6; margin: 0 2px; }
.entry-cta { display: inline-flex; align-items: center; gap: var(--space-2); font-family: var(--font-main); font-size: var(--text-body); font-weight: 600; padding: 10px 22px; border: none; border-radius: var(--radius-full); cursor: pointer; transition: transform var(--transition-fast), opacity var(--transition-fast); }
.entry-card--smart .entry-cta { background: rgba(255, 255, 255, 0.95); color: var(--color-brand-ink); }
.entry-card--manual .entry-cta { background: var(--color-brand-jade); color: var(--color-text-on-accent); }
.entry-cta:hover { opacity: 0.92; transform: translateY(-1px); }

/* 第二屏容器 */
.practice-config-2 { max-width: 880px; margin: 0 auto; }
.btn-back-entry { display: inline-flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-5); padding: 8px 16px; font-family: var(--font-main); font-size: var(--text-body); color: var(--color-text-secondary); background: transparent; border: var(--border-default); border-radius: var(--radius-full); cursor: pointer; transition: var(--transition-normal); }
.btn-back-entry:hover { color: var(--color-brand-jade); border-color: var(--color-brand-jade); background: var(--color-success-bg); }

/* 配置卡片 */
.config-card { background: var(--color-surface-primary); border: var(--border-default); border-radius: var(--radius-lg); padding: var(--space-8); box-shadow: var(--shadow-md); }
.config-card h2 { font-family: var(--font-serif); font-size: var(--text-h2); font-weight: 700; color: var(--color-brand-ink); margin-bottom: var(--space-5); }

/* 模式分组 */
.mode-group { margin-bottom: var(--space-6); }
.mode-group-title { display: flex; align-items: center; gap: var(--space-2); font-family: var(--font-main); font-size: var(--text-body-small); font-weight: 600; color: var(--color-text-secondary); margin-bottom: var(--space-3); padding-left: 12px; border-left: 3px solid var(--color-brand-jade); }
.mode-group .mode-selector { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: var(--space-3); margin-bottom: 0; }

/* 模式卡片（覆盖默认） */
.mode-card { background: var(--color-surface-secondary); border: 2px solid var(--border-default); border-radius: var(--radius-md); }
.mode-card:hover { border-color: var(--color-brand-jade); }
.mode-card.active { border-color: var(--color-brand-jade); background: var(--color-success-bg); }
.mode-name { font-family: var(--font-main); color: var(--color-brand-ink); }
.mode-desc { color: var(--color-text-tertiary); }

/* 配置行与标签 */
.config-row { margin-bottom: var(--space-6); }
.config-label { display: flex; align-items: center; gap: var(--space-2); font-family: var(--font-main); font-size: var(--text-body); font-weight: 600; color: var(--color-brand-ink); margin-bottom: var(--space-3); }
.config-default-hint { font-family: var(--font-main); font-size: var(--text-caption); font-weight: 400; color: var(--color-text-tertiary); }

/* 题型 / 难度 / 数量 选择器 */
.type-list, .tag-list, .grade-list, .text-list, .kp-list { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.type-selector, .difficulty-selector, .count-selector { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.type-item, .tag-item, .grade-item, .text-item, .kp-item { padding: 6px 14px; font-family: var(--font-main); font-size: var(--text-body-small); border: 1px solid var(--border-default); border-radius: var(--radius-full); background: var(--color-surface-primary); color: var(--color-text-secondary); cursor: pointer; transition: var(--transition-normal); -webkit-user-select: none; user-select: none; }
.type-item:hover, .tag-item:hover, .grade-item:hover, .text-item:hover, .kp-item:hover { border-color: var(--color-brand-jade); background: var(--color-surface-secondary); }
.type-item.active, .tag-item.active, .grade-item.active, .text-item.active, .kp-item.active { background: var(--color-brand-jade); color: var(--color-text-on-accent); border-color: var(--color-brand-jade); }
.count-btn, .difficulty-btn, .freq-source-btn { flex: 1; min-width: 72px; padding: 10px 0; font-family: var(--font-main); font-size: var(--text-body); border: 2px solid var(--border-default); border-radius: var(--radius-md); background: var(--color-surface-primary); color: var(--color-text-secondary); cursor: pointer; transition: var(--transition-normal); }
.count-btn:hover, .difficulty-btn:hover, .freq-source-btn:hover { border-color: var(--color-brand-jade); }
.count-btn.active, .difficulty-btn.active, .freq-source-btn.active { border-color: var(--color-brand-jade); background: var(--color-brand-jade); color: var(--color-text-on-accent); }
.count-btn:disabled, .difficulty-btn:disabled { opacity: 0.4; cursor: not-allowed; border-color: var(--border-default); background: var(--color-surface-primary); color: var(--color-text-tertiary); }
.difficulty-hint { font-size: var(--text-caption); color: var(--color-text-tertiary); }

/* 年级 / 课文 选择器图标前缀 */
.grade-selector .config-label::before { content: '📚'; }
.text-selector .config-label::before { content: '📖'; }

/* 课文列表滚动条 */
.text-list { max-height: 200px; overflow-y: auto; padding-right: var(--space-2); }
.text-list::-webkit-scrollbar { width: 4px; }
.text-list::-webkit-scrollbar-track { background: var(--border-default); border-radius: 2px; }
.text-list::-webkit-scrollbar-thumb { background: var(--color-text-tertiary); border-radius: 2px; }

/* 词频档位 / 来源（覆盖默认 active） */
.freq-tier-btn { padding: 8px 16px; font-family: var(--font-main); font-size: var(--text-body-small); border: 1px solid var(--border-default); border-radius: var(--radius-md); background: var(--color-surface-primary); color: var(--color-text-secondary); cursor: pointer; transition: var(--transition-normal); -webkit-user-select: none; user-select: none; }
.freq-tier-btn:hover { border-color: var(--color-brand-jade); background: var(--color-surface-secondary); }
.freq-tier-btn.active { background: var(--color-brand-jade); color: var(--color-text-on-accent); border-color: var(--color-brand-jade); }
.freq-preview-info { font-family: var(--font-main); font-size: var(--text-body-small); color: var(--color-text-secondary); padding: 10px 14px; background: var(--color-surface-secondary); border-radius: var(--radius-md); }
.freq-preview-source, .freq-preview-tier, .freq-preview-count { font-weight: 600; color: var(--color-brand-ink); }

/* 统计网格（覆盖默认） */
.stats-card { background: var(--color-surface-primary); border: var(--border-default); border-radius: var(--radius-lg); padding: var(--space-8); box-shadow: var(--shadow-md); }
.stats-card h2 { font-family: var(--font-serif); font-size: var(--text-h2); font-weight: 700; color: var(--color-brand-ink); margin-bottom: var(--space-5); }
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.stat-item { text-align: center; padding: var(--space-4) var(--space-2); background: var(--color-surface-secondary); border-radius: var(--radius-md); }
.stat-num { font-size: 24px; font-weight: 700; color: var(--color-brand-ink); margin-bottom: 4px; }
.stat-num.stat-correct { color: var(--color-brand-jade); }
.stat-num.stat-wrong { color: var(--color-brand-vermilion); }
.stat-num.stat-rate { color: var(--color-brand-gold); }
.stat-label { font-size: var(--text-caption); color: var(--color-text-tertiary); }

/* 练习区 */
.practice-area {
    padding-bottom: 60px;
}

.practice-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 24px;
    padding: 16px 24px;
    background: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.progress-info {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-dark);
    min-width: 60px;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-dark), var(--color-gold));
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.practice-score {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-gold-text);
    min-width: 80px;
    text-align: right;
}

/* 题目卡片 */
.question-card {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
    animation: fadeInUp 0.4s ease;
}

.question-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.question-id {
    font-size: 12px;
    color: var(--color-text-light);
    font-family: monospace;
}

.question-difficulty {
    font-size: 14px;
    color: var(--color-star);
}

.question-source {
    font-size: 13px;
    color: var(--color-text-secondary);
    padding: 2px 10px;
    background: var(--color-card-bg);
    border-radius: 12px;
}

.question-sentence {
    font-size: 24px;
    font-family: var(--font-serif);
    line-height: 2;
    color: var(--color-dark);
    text-align: center;
    padding: 32px 24px;
    background: var(--color-card-bg);
    border-radius: var(--radius);
    margin-bottom: 32px;
    letter-spacing: 3px;
}

.question-stem {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 16px;
    line-height: 1.6;
}

.question-sentence .highlight-word {
    font-weight: 700;
    color: var(--color-highlight);
    text-decoration: underline wavy var(--color-highlight);
    text-underline-offset: 4px;
}

.question-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--color-card-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.option-item:hover {
    border-color: var(--color-dark);
    transform: translateX(4px);
}

.option-item.selected {
    border-color: var(--color-dark);
    background: var(--color-active-bg);
}

.option-item.correct {
    border-color: var(--color-success);
    background: var(--color-success-bg);
}

.option-item.wrong {
    border-color: var(--color-error);
    background: var(--color-error-bg);
}

/* 答题反馈动画 */
@keyframes pulse-correct {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(39, 174, 96, 0.4);
    }
    50% {
        transform: scale(1.02);
        box-shadow: 0 0 0 8px rgba(39, 174, 96, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(39, 174, 96, 0);
    }
}

@keyframes shake-wrong {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-4px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(4px);
    }
}

.option-item.correct {
    animation: pulse-correct 0.6s ease-out;
}

.option-item.wrong {
    animation: shake-wrong 0.5s ease-out;
}

.option-item.disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.option-label {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 2px solid var(--color-border);
    border-radius: 50%;
    font-weight: 700;
    font-size: 14px;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

.option-item.correct .option-label {
    background: var(--color-success);
    border-color: var(--color-success);
    color: white;
}

.option-item.wrong .option-label {
    background: var(--color-error);
    border-color: var(--color-error);
    color: white;
}

.option-text {
    flex: 1;
    font-size: 16px;
    color: var(--color-text);
}

/* 答题结果 */
.question-result {
    margin-top: 24px;
    padding: 20px 24px;
    border-radius: var(--radius);
    animation: fadeInUp 0.3s ease;
}

.question-result.correct {
    background: var(--color-success-bg);
    border-left: 4px solid var(--color-success);
}

.question-result.wrong {
    background: var(--color-error-bg);
    border-left: 4px solid var(--color-error);
}

.result-icon {
    font-size: 24px;
    margin-bottom: 8px;
    animation: result-icon-appear 0.4s ease-out;
}

@keyframes result-icon-appear {
    0% {
        opacity: 0;
        transform: scale(0.5);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.result-text {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.question-result.correct .result-text {
    color: var(--color-success);
}

.question-result.wrong .result-text {
    color: var(--color-error);
}

.result-explanation {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.question-actions {
    margin-top: 24px;
    text-align: right;
}

/* 练习结果页 */
.practice-result-page {
    padding: 40px 0 60px;
    animation: fadeInUp 0.5s ease;
}

.practice-result-page .result-card {
    max-width: 500px;
    margin: 0 auto;
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 48px 40px;
    box-shadow: var(--shadow);
    text-align: center;
}

.result-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 32px;
}

.result-score-display {
    margin-bottom: 32px;
}

.score-circle {
    display: inline-flex;
    align-items: baseline;
    justify-content: center;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-gold-light), var(--color-gold));
    color: var(--color-dark);
    font-size: 56px;
    font-weight: 700;
    box-shadow: 0 8px 24px rgba(212, 168, 83, 0.3);
}

.score-circle span {
    line-height: 160px;
}

.score-total {
    font-size: 18px !important;
    font-weight: 400 !important;
    margin-left: 4px;
}

.result-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 32px;
}

.result-stat {
    text-align: center;
}

.result-stat-label {
    display: block;
    font-size: 13px;
    color: var(--color-text-light);
    margin-bottom: 4px;
}

.result-stat-value {
    font-size: 24px;
    font-weight: 700;
}

.result-stat-value.correct {
    color: var(--color-success);
}

.result-stat-value.wrong {
    color: var(--color-error);
}

.result-stat-value.rate {
    color: var(--color-gold-text);
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.result-actions .btn-primary,
.result-actions .btn-secondary {
    width: 100%;
}

/* 结果页统计优化 */
.practice-result-page .result-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding: 24px;
    background: var(--color-card-bg);
    border-radius: var(--radius);
    margin-bottom: 32px;
}

.result-stat-item {
    text-align: center;
    padding: 12px 8px;
}

.result-stat-icon {
    font-size: 24px;
    margin-bottom: 8px;
}

.result-stat-value-large {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 4px;
}

.result-stat-value-large.correct {
    color: var(--color-success);
}

.result-stat-value-large.wrong {
    color: var(--color-error);
}

.result-stat-value-large.rate {
    color: var(--color-gold-text);
}

/* 错题列表 */
.wrong-list {
    margin-top: 32px;
    padding: 24px;
    background: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.wrong-list-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.wrong-list-title::before {
    content: '❌';
}

.wrong-list-empty {
    text-align: center;
    padding: 24px;
    color: var(--color-text-light);
    font-size: 15px;
}

.wrong-list-empty::before {
    content: '🎉';
    font-size: 32px;
    display: block;
    margin-bottom: 12px;
}

.wrong-item {
    padding: 16px 20px;
    background: var(--color-error-bg);
    border-radius: 8px;
    margin-bottom: 12px;
    border-left: 4px solid var(--color-error);
    transition: var(--transition);
}

.wrong-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
}

.wrong-item:last-child {
    margin-bottom: 0;
}

.wrong-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.wrong-item-sentence {
    font-size: 16px;
    font-family: var(--font-serif);
    color: var(--color-dark);
    letter-spacing: 2px;
}

.wrong-item-word {
    font-size: 14px;
    color: var(--color-highlight);
    font-weight: 600;
    padding: 2px 8px;
    background: #fef5f5;
    border-radius: 4px;
}

.wrong-item-detail {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.wrong-item-your-answer {
    color: var(--color-error);
}

.wrong-item-correct-answer {
    color: var(--color-success);
}

.wrong-item-source {
    margin-left: auto;
    color: var(--color-text-light);
}

.wrong-item-toggle,
.wrong-item-ai-btn {
    margin-top: 12px;
    padding: 6px 14px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.wrong-item-toggle:hover,
.wrong-item-ai-btn:hover {
    border-color: var(--color-dark);
    color: var(--color-dark);
}

.wrong-item-ai-btn {
    margin-left: 8px;
    background: linear-gradient(135deg, var(--color-dark), #3d5a70);
    color: var(--color-white);
    border-color: var(--color-dark);
}

.wrong-item-ai-btn:hover {
    opacity: 0.9;
    color: var(--color-white);
}

.wrong-item-ai-btn .btn-icon {
    font-size: 14px;
}

/* 知识点分布图表 */
.knowledge-chart {
    margin-top: 32px;
    padding: 24px;
    background: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.knowledge-chart-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.knowledge-chart-title::before {
    content: '📊';
}

.knowledge-chart-bars {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.knowledge-bar {
    display: flex;
    align-items: center;
    gap: 12px;
}

.knowledge-bar-label {
    min-width: 80px;
    font-size: 13px;
    color: var(--color-text-secondary);
    text-align: right;
}

.knowledge-bar-track {
    flex: 1;
    height: 24px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.knowledge-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-dark), var(--color-gold));
    border-radius: 4px;
    transition: width 0.5s ease-out;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 8px;
}

.knowledge-bar-count {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-white);
}

.knowledge-bar-fill.low-count {
    background: var(--color-dark);
}

.knowledge-bar-fill.medium-count {
    background: linear-gradient(90deg, var(--color-dark), var(--color-info));
}

.knowledge-bar-fill.high-count {
    background: linear-gradient(90deg, var(--color-gold), var(--color-error));
}

/* --- 响应式 --- */
@media (max-width: 768px) {
    /* 导航栏移动端优化 */
    .header-inner {
        height: 60px;
        padding: 0 16px;
        flex-direction: row;
        gap: 0;
    }

    .nav {
        display: none;
    }

    .hamburger-btn {
        display: flex;
    }

    .logo-sub {
        display: none;
    }

    .logo-text {
        font-size: 20px;
    }

    /* 主内容区 */
    .main {
        padding: 0 16px;
    }

    /* 搜索区 */
    .search-box {
        flex-direction: column;
        gap: 12px;
    }

    .search-input {
        letter-spacing: 4px;
        height: 52px;
    }

    .search-btn {
        width: 100%;
        height: 52px;
    }

    .result-card {
        padding: 20px;
    }

    .result-header {
        flex-direction: column;
        text-align: center;
        gap: 16px;
        padding-bottom: 24px;
        margin-bottom: 24px;
    }

    .result-char {
        width: 80px;
        height: 80px;
        font-size: 56px;
    }

    .result-pinyin {
        font-size: 18px;
    }

    .meaning-item {
        padding: 16px;
    }

    .meaning-example {
        padding-left: 0;
        font-size: 14px;
    }

    .eg-line {
        font-size: 14px;
    }

    .eg-source {
        font-size: 11px;
        margin-top: 3px;
    }

    .hot-words {
        padding: 32px 0 48px;
    }

    .hot-word-btn {
        width: 52px;
        height: 52px;
    }

    .hot-word-char {
        font-size: 20px;
    }

    /* 每日一词页 */
    .daily-hero {
        padding: 32px 0 16px;
    }

    .daily-title {
        font-size: 22px;
    }

    /* 练习页 */
    .practice-hero {
        padding: 40px 0 24px;
    }

    .practice-hero h1 {
        font-size: 24px;
    }

    .practice-desc {
        font-size: 14px;
    }

    .practice-config {
        flex-direction: column;
        padding-bottom: 48px;
    }

    .config-card {
        padding: 24px 20px;
    }

    .config-card h2 {
        font-size: 16px;
        margin-bottom: 16px;
    }

    .mode-selector {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
        margin-bottom: 20px;
    }

    .mode-card {
        padding: 16px 12px;
    }

    .mode-icon {
        font-size: 24px;
    }

    .mode-name {
        font-size: 14px;
    }

    .mode-desc {
        font-size: 11px;
    }

    .count-selector {
        gap: 6px;
    }

    .count-btn {
        padding: 10px 0;
        font-size: 13px;
    }

    .stats-card {
        padding: 24px 20px;
    }

    .stats-card h2 {
        font-size: 16px;
        margin-bottom: 16px;
    }

    .btn-primary,
    .btn-secondary {
        min-height: 48px;
        font-size: 15px;
    }

    .btn-large {
        padding: 14px;
        font-size: 16px;
    }

    .practice-header {
        flex-wrap: wrap;
        gap: 12px;
        padding: 14px 16px;
    }

    .progress-bar {
        order: 3;
        width: 100%;
    }

    .question-card {
        padding: 24px 20px;
    }

    .question-sentence {
        font-size: 18px;
        padding: 20px 16px;
        letter-spacing: 2px;
    }

    .question-options {
        gap: 10px;
    }

    .option-item {
        padding: 14px 16px;
        min-height: 48px;
    }

    .option-label {
        width: 32px;
        height: 32px;
        font-size: 13px;
    }

    .option-text {
        font-size: 15px;
    }

    .result-stats {
        gap: 20px;
    }

    .score-circle {
        width: 140px;
        height: 140px;
        font-size: 48px;
    }

    .score-circle span {
        line-height: 140px;
    }

    /* 翻译页 */
    .translate-hero {
        padding: 40px 0 24px;
    }

    .translate-hero h1 {
        font-size: 24px;
    }

    .translate-desc {
        font-size: 14px;
    }

    .translate-source {
        padding: 28px 20px;
    }

    .source-sentence {
        font-size: 22px;
        letter-spacing: 3px;
    }

    /* 步骤指示器紧凑网格（2列×3行，节省约40%纵向空间） */
    .step-progress {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 6px;
        margin-bottom: 16px;
    }

    .step-dot {
        width: 100%;
        height: 32px;
        border-radius: 6px;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 0 8px;
    }

    .step-dot-label {
        position: static;
        transform: none;
        font-size: 12px;
        color: var(--color-text-secondary);
    }

    .step-dot.active .step-dot-label {
        color: var(--color-white);
        font-weight: 600;
    }

    .step-dot.completed .step-dot-label {
        color: var(--color-dark);
        font-weight: 500;
    }

    .step-card {
        padding: 24px 20px;
    }

    .step-card-header {
        gap: 12px;
        margin-bottom: 16px;
    }

    .step-card-num {
        width: 36px;
        height: 36px;
        font-size: 15px;
    }

    .step-card-name {
        font-size: 18px;
    }

    .step-card-instruction {
        font-size: 14px;
        padding: 12px 16px;
        margin-bottom: 20px;
    }

    .answer-input {
        padding: 12px 14px;
        font-size: 16px; /* [修复C-03] 防止iOS Safari自动缩放(需>=16px) */
    }

    .answer-actions {
        flex-direction: column;
    }

    .answer-actions .btn-primary,
    .answer-actions .btn-secondary {
        width: 100%;
    }

    .sentence-source {
        display: none;
    }

    .sentence-item {
        padding: 14px 16px;
    }

    .sentence-text {
        font-size: 17px;
        letter-spacing: 1px;
    }

    .final-card {
        padding: 32px 24px;
    }

    .final-original {
        font-size: 20px;
    }

    .final-translated {
        font-size: 16px;
    }

    .final-actions {
        flex-direction: column;
    }

    .final-actions .btn-primary,
    .final-actions .btn-secondary {
        width: 100%;
    }

    /* 字表页 */
    .rank-header {
        padding: 48px 0 28px;
    }

    .rank-header h1 {
        font-size: 24px;
    }

    .rank-header p {
        font-size: 14px;
        margin-bottom: 24px;
    }

    .rank-filter {
        gap: 6px;
    }

    .filter-btn {
        padding: 10px 12px;
        font-size: 13px;
        min-height: 44px;
    }

    .rank-table {
        padding-bottom: 48px;
    }

    .rank-row {
        padding: 14px 16px;
        min-height: 64px;
    }

    .rank-num {
        width: 28px;
        font-size: 13px;
    }

    .rank-char {
        width: 44px;
        height: 44px;
        font-size: 22px;
        margin-right: 12px;
    }

    .rank-pinyin {
        font-size: 13px;
    }

    .rank-star {
        font-size: 14px;
    }

    .rank-freq {
        font-size: 12px;
    }

    /* 关于页 */
    .about-content {
        padding: 48px 0;
    }

    .about-content h1 {
        font-size: 24px;
        margin-bottom: 28px;
    }

    .about-card {
        padding: 24px 20px;
    }

    .about-card h2 {
        font-size: 16px;
        margin-bottom: 12px;
        padding-bottom: 10px;
    }

    .about-card p {
        font-size: 14px;
        line-height: 1.9;
    }

    /* 底部 */
    .footer {
        padding: 32px 16px;
        margin-top: 32px;
    }

    /* 筛选组件移动端样式 */
    .grade-selector,
    .text-selector {
        margin-bottom: 16px;
    }

    .freq-selector {
        margin-bottom: 16px;
    }

    .freq-source-btn {
        font-size: 13px;
        padding: 8px 0;
    }

    .freq-tier-btn {
        padding: 6px 12px;
        font-size: 12px;
    }

    .freq-preview-info {
        font-size: 12px;
        padding: 8px 12px;
    }

    .grade-list,
    .text-list {
        gap: 6px;
    }

    .grade-item {
        padding: 8px 14px;
        font-size: 13px;
        min-height: 36px;
        display: inline-flex;
        align-items: center;
    }

    .text-item {
        padding: 6px 12px;
        font-size: 12px;
    }

    .text-list {
        max-height: 150px;
    }

    /* 多选状态移动端 */
    .multi-select .grade-item.active,
    .multi-select .text-item.active {
        padding-left: 28px;
    }

    .multi-select .grade-item.active::before,
    .multi-select .text-item.active::before {
        left: 8px;
        font-size: 11px;
    }

    /* 结果页统计移动端 */
    .practice-result-page .result-stats {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 16px;
    }

    .result-stat-item {
        padding: 8px;
    }

    .result-stat-value-large {
        font-size: 24px;
    }

    /* 错题列表移动端 */
    .wrong-list {
        padding: 16px;
        margin-top: 24px;
    }

    .wrong-list-title {
        font-size: 16px;
        margin-bottom: 16px;
    }

    .wrong-item {
        padding: 12px 16px;
        margin-bottom: 8px;
    }

    .wrong-item-header {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }

    .wrong-item-sentence {
        font-size: 14px;
        letter-spacing: 1px;
    }

    .wrong-item-detail {
        flex-direction: column;
        gap: 8px;
    }

    .wrong-item-source {
        margin-left: 0;
    }

    /* 知识点图表移动端 */
    .knowledge-chart {
        padding: 16px;
        margin-top: 24px;
    }

    .knowledge-chart-title {
        font-size: 16px;
        margin-bottom: 16px;
    }

    .knowledge-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 6px;
    }

    .knowledge-bar-label {
        min-width: auto;
        text-align: left;
        font-size: 12px;
    }

    .knowledge-bar-track {
        height: 20px;
    }

    .knowledge-bar-fill {
        padding-right: 6px;
    }

    .knowledge-bar-count {
        font-size: 11px;
    }
}

/* === 每日一词页 === */
/* ========================================
   每日一词 — 新中式社交卡片风格
   设计理念：宣纸质感 · 印章点缀 · 山水留白
   ======================================== */

.daily-hero {
    text-align: center;
    padding: 36px 0 20px;
}

.daily-title {
    font-size: 26px;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 6px;
    letter-spacing: 4px;
}

.daily-subtitle {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
}

.daily-countdown {
    font-size: 13px;
    color: var(--color-text-light);
    letter-spacing: 1px;
}

/* 卡片外层容器 */
.daily-card-wrapper {
    max-width: 440px;
    margin: 0 auto 28px;
    animation: fadeInUp 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    padding: 0 4px;
}

/* ========== 分享卡片主体 ========== */
.daily-share-card {
    position: relative;
    width: 100%;
    min-height: 560px;
    /* 移除固定 aspect-ratio，改为 min-height 自适应，解决多义项内容截断问题 */
    background: linear-gradient(175deg, #faf8f3 0%, #f5f0e6 40%, #efe9dd 100%);
    border-radius: 16px;
    overflow: visible;
    box-shadow:
        0 4px 24px rgba(44, 62, 80, 0.08),
        0 1px 3px rgba(44, 62, 80, 0.04),
        inset 0 0 60px rgba(139, 119, 88, 0.04);
    display: flex;
    flex-direction: column;
    padding: 32px 28px 24px;
}

/* 宣纸纹理叠加 */
.daily-share-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background:
        radial-gradient(ellipse at 20% 10%, rgba(180, 160, 120, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 90%, rgba(180, 160, 120, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* 装饰性细线边框 */
.daily-share-card::after {
    content: '';
    position: absolute;
    top: 12px;
    right: 12px;
    bottom: 12px;
    left: 12px;
    border: 1px solid rgba(180, 160, 120, 0.18);
    border-radius: 8px;
    pointer-events: none;
    z-index: 0;
}

/* 背景山水装饰（右上角淡墨远山） */
.card-bg-mountains {
    position: absolute;
    top: -20px;
    right: -30px;
    width: 200px;
    height: 160px;
    opacity: 0.035;
    z-index: 0;
    pointer-events: none;
    background:
        /* 远山第一层 */
        radial-gradient(ellipse 180px 50px at 60% 80%, #3a3530 0%, transparent 70%),
        /* 远山第二层 */
        radial-gradient(ellipse 140px 60px at 40% 65%, #4a4540 0%, transparent 70%),
        /* 远山第三层 */
        radial-gradient(ellipse 160px 40px at 70% 55%, #3a3530 0%, transparent 70%);
}

/* 背景装饰圆（左下角水墨晕染） */
.card-bg-circle {
    position: absolute;
    bottom: -40px;
    left: -40px;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(180, 160, 120, 0.06) 0%, transparent 70%);
    z-index: 0;
    pointer-events: none;
}

/* 印章装饰 — 改为 relative 定位，随内容流排列，不再遮挡义项 */
.card-seal-row {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: flex-end;
    margin-top: 12px;
    margin-bottom: 0;
    padding-right: 4px;
}

.card-seal {
    position: relative;
    width: 40px;
    height: 40px;
    border: 2.5px solid #c0392b;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 700;
    color: #c0392b;
    opacity: 0.55;
    transform: rotate(-6deg);
    z-index: 1;
    letter-spacing: 0;
    line-height: 1;
}

/* 顶部日期栏 */
.card-date-bar {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 16px;
}

.card-date-label {
    font-size: 12px;
    color: #7a6a58;
    letter-spacing: 2px;
    font-weight: 500;
}

.card-date-value {
    font-size: 12px;
    color: #8a7a68;
    font-family: var(--font-serif);
    letter-spacing: 1px;
}

/* 字词主体区域 */
.card-main {
    position: relative;
    z-index: 1;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-char-row {
    display: flex;
    align-items: flex-end;
    gap: 20px;
    margin-bottom: 24px;
}

.card-char {
    font-size: 108px;
    font-family: var(--font-serif);
    color: #2c2420;
    line-height: 1;
    letter-spacing: -2px;
    text-shadow: 0 2px 8px rgba(44, 36, 32, 0.06);
}

.card-side-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-bottom: 12px;
}

.card-pinyin {
    font-size: 20px;
    color: #7a6a58;
    font-weight: 400;
    letter-spacing: 1px;
}

.card-star {
    color: #c0392b;
    font-size: 13px;
    opacity: 0.7;
    letter-spacing: 1px;
}

/* 分隔线 */
.card-divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, transparent, rgba(180, 160, 120, 0.3), transparent);
    margin-bottom: 20px;
}

/* 释义区域 */
.card-meanings {
    flex: 1;
}

.card-meanings .daily-meaning-item {
    display: flex;
    gap: 10px;
    margin-bottom: 14px;
    font-size: 15px;
    line-height: 1.7;
}

.card-meanings .daily-meaning-seq {
    color: #7a6a58;
    font-weight: 500;
    min-width: 20px;
    font-size: 13px;
}

.card-meanings .daily-meaning-content {
    flex: 1;
    color: #3a3530;
    font-size: 15px;
    line-height: 1.7;
}

.card-meanings .daily-meaning-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.card-meanings .daily-meaning-example {
    font-family: var(--font-serif);
    font-size: 13px;
    color: #8a7a68;
    line-height: 1.8;
    padding-left: 2px;
    border-left: 2px solid rgba(180, 160, 120, 0.25);
    margin-top: 2px;
}

.card-meanings .daily-meaning-source {
    display: inline;
    font-size: 11px;
    color: #b0a090;
    font-family: var(--font-main);
    font-style: normal;
}

/* 紧凑模式：义项数量 > 4 时自动启用，缩小间距避免卡片过长 */
.daily-share-card.compact-meanings .daily-meaning-item {
    margin-bottom: 10px;
    line-height: 1.6;
}

.daily-share-card.compact-meanings .daily-meaning-content {
    font-size: 14px;
    line-height: 1.6;
}

.daily-share-card.compact-meanings .daily-meaning-example {
    font-size: 12px;
    line-height: 1.6;
    margin-top: 1px;
}

.daily-share-card.compact-meanings .card-char-row {
    margin-bottom: 18px;
}

.daily-share-card.compact-meanings .card-divider {
    margin-bottom: 14px;
}

/* 深色主题下义项例句的颜色由 [data-theme="dark"] 规则统一管理 */

/* 例句区域 */
.card-example {
    position: relative;
    z-index: 1;
    margin-top: 16px;
    padding: 16px 20px;
    background: rgba(255, 253, 248, 0.7);
    border-radius: 10px;
    border-left: 3px solid rgba(180, 160, 120, 0.3);
}

.card-example .daily-example-sentence {
    font-family: var(--font-serif);
    font-size: 17px;
    color: #3a3530;
    line-height: 1.9;
    margin-bottom: 6px;
}

.card-example .daily-example-source {
    font-size: 12px;
    color: #b0a090;
    text-align: right;
    font-style: italic;
}

/* 底部品牌 */
.card-footer {
    position: relative;
    z-index: 1;
    margin-top: 16px;
    text-align: center;
}

.card-footer-line {
    width: 60px;
    height: 1px;
    background: rgba(180, 160, 120, 0.25);
    margin: 0 auto 10px;
}

.card-footer-text {
    font-size: 10px;
    color: #8a7a6a;
    letter-spacing: 2px;
}

/* ========== 操作按钮区 ========== */
.daily-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    justify-content: center;
}

.btn-daily-action {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 22px;
    font-size: 14px;
    border: 1.5px solid var(--color-border);
    border-radius: 28px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-main);
}

.btn-daily-action .btn-icon {
    font-size: 16px;
    line-height: 1;
}

.btn-daily-action:hover {
    border-color: var(--color-dark);
    color: var(--color-dark);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.btn-master.active {
    background: var(--color-gold-light);
    border-color: var(--color-gold-text);
    color: var(--color-dark);
}

.btn-share:hover {
    background: var(--color-dark);
    border-color: var(--color-dark);
    color: var(--color-white);
}

.btn-refresh:hover .btn-icon {
    transform: rotate(180deg);
    transition: transform 0.4s ease;
}

/* ========== 历史记录 ========== */
.daily-history {
    max-width: 440px;
    margin: 0 auto;
    background: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.daily-history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    cursor: pointer;
    font-weight: 600;
    color: var(--color-dark);
    transition: var(--transition);
}

.daily-history-header:hover {
    background: var(--color-card-bg);
}

.daily-history-arrow {
    font-size: 12px;
    transition: transform 0.3s ease;
}

.daily-history.expanded .daily-history-arrow {
    transform: rotate(180deg);
}

.daily-history-list {
    border-top: 1px solid var(--color-border);
    max-height: 300px;
    overflow-y: auto;
}

.daily-history-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 24px;
    border-bottom: 1px solid var(--color-border);
    cursor: pointer;
    transition: var(--transition);
}

.daily-history-item:hover {
    background: var(--color-card-bg);
}

.daily-history-item:last-child {
    border-bottom: none;
}

.daily-history-date {
    font-size: 13px;
    color: var(--color-text-light);
    min-width: 80px;
}

.daily-history-char {
    font-size: 24px;
    font-family: var(--font-serif);
    color: var(--color-dark);
    min-width: 40px;
}

.daily-history-info {
    flex: 1;
}

.daily-history-pinyin {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.daily-history-mastered {
    padding: 2px 8px;
    background: var(--color-gold);
    color: var(--color-dark);
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
}

/* --- 历史回溯查看 --- */
.daily-rewind-bar {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 10px 16px;
    margin-bottom: 12px;
    background: rgba(180, 160, 120, 0.12);
    border-radius: 10px;
    font-size: 13px;
    color: #8a7a68;
}

.daily-rewind-bar.visible {
    display: flex;
}

.btn-rewind-back {
    background: none;
    border: 1px solid rgba(180, 160, 120, 0.3);
    border-radius: 6px;
    padding: 4px 12px;
    font-size: 12px;
    color: #7a6a58;
    cursor: pointer;
    font-family: var(--font-main);
    transition: background 0.2s, color 0.2s;
}

.btn-rewind-back:hover {
    background: rgba(180, 160, 120, 0.15);
    color: #3a3530;
}

/* 历史条目可点击状态 */
.daily-history-item.clickable {
    cursor: pointer;
    transition: background 0.2s;
    position: relative;
}

.daily-history-item.clickable:hover {
    background: rgba(180, 160, 120, 0.08);
}

.daily-history-arrow {
    margin-left: auto;
    font-size: 16px;
    color: var(--color-text-light);
    line-height: 1;
}

/* 回溯模式卡片边框提示 */
.daily-share-card.rewind-mode::after {
    border-color: rgba(180, 160, 120, 0.35);
}

/* 响应式 */
@media (max-width: 768px) {
    .daily-card-wrapper {
        max-width: 340px;
    }

    .daily-share-card {
        padding: 24px 22px 20px;
    }

    .card-char {
        font-size: 72px;
    }

    .card-side-info {
        padding-bottom: 8px;
    }

    .card-pinyin {
        font-size: 17px;
    }

    .card-meanings .daily-meaning-content {
        font-size: 14px;
    }

    .card-meanings .daily-meaning-example {
        font-size: 12px;
    }

    .card-example .daily-example-sentence {
        font-size: 15px;
    }

    .card-seal {
        width: 34px;
        height: 34px;
        font-size: 18px;
    }

    .card-seal-row {
        margin-top: 8px;
    }
}

@media (max-width: 320px) {
    .daily-share-card {
        max-width: calc(100vw - 32px);
        padding: 20px 16px;
    }
    .daily-share-card .card-char {
        font-size: 56px;
    }
    .header-inner {
        padding: 0 12px;
    }
    .home-features-grid {
        grid-template-columns: 1fr;
    }
    .practice-hero h1,
    .translate-hero h1,
    .rank-header h1 {
        font-size: 20px;
    }
}

@media (max-width: 380px) {
    .daily-card-wrapper {
        max-width: calc(100vw - 40px);
    }

    .daily-share-card {
        padding: 20px 18px 16px;
    }

    .card-char {
        font-size: 72px;
    }

    .daily-actions {
        flex-direction: column;
        align-items: center;
    }
}

/* ========== 深色主题（夜读模式） ========== */
/* 深色主题样式已统一由 [data-theme="dark"] 规则管理，见文件末尾暗色主题区域 */

/* 在操作区显示的主题切换 */
.btn-daily-action.btn-theme {
    font-size: 14px;
}

/* === 答题交互优化 === */

/* 选项点击反馈 */
.option-item {
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), background-color 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), border-color 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.option-item:active {
    transform: scale(0.97);
}

/* 选项正确状态 */
.option-item.correct {
    border-color: var(--color-success);
    background: linear-gradient(135deg, var(--color-success-bg) 0%, #d4f5e6 100%);
    animation: pulse-correct 0.5s ease;
}

/* 选项错误状态 */
.option-item.wrong {
    border-color: var(--color-error);
    background: linear-gradient(135deg, var(--color-error-bg) 0%, #fce4e1 100%);
    animation: shake-wrong 0.5s ease;
}

/* 正确答案高亮动画 */
.option-item.highlight-correct {
    border-color: var(--color-success);
    background: var(--color-success-bg);
    animation: highlight-glow 0.8s ease;
}

/* pulse-correct 和 shake-wrong 已在上方 line 2566-2591 定义，此处不再重复 */

@keyframes highlight-glow {
    0% { box-shadow: 0 0 0 0 rgba(39, 174, 96, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(39, 174, 96, 0); }
    100% { box-shadow: 0 0 0 0 rgba(39, 174, 96, 0); }
}

/* 结果图标动画 */
.result-icon {
    animation: icon-pop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes icon-pop {
    0% { transform: scale(0) rotate(-180deg); opacity: 0; }
    100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

/* 进度条优化 */
.progress-fill {
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background: linear-gradient(90deg, var(--color-dark), var(--color-gold));
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* 得分动画 */
.practice-score {
    transition: transform 0.2s ease;
}

.practice-score.bump {
    animation: score-bump 0.3s ease;
}

@keyframes score-bump {
    0% { transform: scale(1); }
    50% { transform: scale(1.3); color: var(--color-gold-text); }
    100% { transform: scale(1); }
}

/* === 结果页优化 === */
.practice-result-page .result-card {
    animation: fadeInUp 0.6s ease;
}

/* 分数显示动画 */
.result-score-display {
    animation: score-reveal 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes score-reveal {
    0% { transform: scale(0.5); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

/* 统计数字动画 */
.result-stats {
    animation: stats-slide 0.6s ease 0.3s both;
}

@keyframes stats-slide {
    0% { transform: translateY(20px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

/* 知识点图表动画 */
.knowledge-chart {
    animation: chart-expand 0.6s ease 0.4s both;
}

@keyframes chart-expand {
    0% { transform: scaleY(0); opacity: 0; }
    100% { transform: scaleY(1); opacity: 1; }
}

.knowledge-bar {
    animation: bar-fill 0.8s ease both;
}

.knowledge-bar:nth-child(1) { animation-delay: 0.5s; }
.knowledge-bar:nth-child(2) { animation-delay: 0.6s; }
.knowledge-bar:nth-child(3) { animation-delay: 0.7s; }
.knowledge-bar:nth-child(4) { animation-delay: 0.8s; }
.knowledge-bar:nth-child(5) { animation-delay: 0.9s; }

@keyframes bar-fill {
    0% { width: 0% !important; }
    100% { width: var(--bar-width); }
}

/* 错题列表动画 */
.wrong-list {
    animation: list-fade 0.6s ease 0.5s both;
}

@keyframes list-fade {
    0% { transform: translateY(10px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

/* 操作按钮优化 */
.result-actions {
    display: flex;
    gap: 12px;
    animation: buttons-appear 0.5s ease 0.7s both;
}

@keyframes buttons-appear {
    0% { transform: translateY(20px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

.result-actions .btn-primary,
.result-actions .btn-secondary {
    flex: 1;
    padding: 14px 20px;
}

/* === 筛选流程优化 === */

/* 筛选条件预览 */
.filter-preview {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px 16px;
    background: var(--color-card-bg);
    border-radius: var(--radius);
    margin-bottom: 16px;
}

.filter-preview-label {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.filter-preview-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: var(--color-dark);
    color: var(--color-white);
    border-radius: 12px;
    font-size: 12px;
}

.filter-preview-tag .remove {
    cursor: pointer;
    opacity: 0.7;
}

.filter-preview-tag .remove:hover {
    opacity: 1;
}

.filter-clear-all {
    padding: 4px 12px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    font-size: 12px;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.filter-clear-all:hover {
    border-color: var(--color-dark);
    color: var(--color-dark);
}

/* 题量显示 */
.count-available {
    font-size: 13px;
    color: var(--color-text-light);
    text-align: center;
    margin-top: 12px;
}

.count-available strong {
    color: var(--color-dark);
    font-weight: 600;
}

/* 移动端优化 */
@media (max-width: 768px) {
    /* 答题卡片移动端优化 */
    .question-card {
        padding: 20px;
    }
    
    .option-item {
        padding: 14px 16px;
    }
    
    /* 结果页移动端 */
    .result-stats {
        flex-direction: column;
        gap: 16px;
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .result-actions .btn-primary,
    .result-actions .btn-secondary {
        width: 100%;
    }
    
    /* 绛涢€夐瑙堢Щ鍔ㄧ */
    .filter-preview {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ========================================
   AI智能讲解组件样式
   ======================================== */

/* 遮罩层 */
.ai-drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 500;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.ai-drawer-overlay.open {
    opacity: 1;
    visibility: visible;
}

/* 侧边抽屉 */
.ai-drawer {
    position: fixed;
    top: 0;
    right: 0;
    width: 420px;
    height: 100vh;
    height: 100dvh;
    background: var(--color-white);
    z-index: 501;
    display: flex;
    flex-direction: column;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(100%);
}

.ai-drawer.open {
    transform: translateX(0);
}

/* 头部 */
.ai-drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.ai-drawer-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 600;
    color: var(--color-dark);
}

.ai-icon {
    font-size: 22px;
}

.ai-mode-badge {
    font-size: 12px;
    padding: 2px 8px;
    background: var(--color-gold-light);
    color: var(--color-gold-text);
    border-radius: 10px;
    font-weight: normal;
}

.ai-drawer-close {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
    transition: var(--transition);
}

.ai-drawer-close:hover {
    color: var(--color-dark);
}

/* 内容区 */
.ai-drawer-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    line-height: 1.8;
}

/* 思考中动画 */
.ai-thinking {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 40px 0;
}

.thinking-dots {
    display: flex;
    gap: 6px;
}

.thinking-dots span {
    width: 8px;
    height: 8px;
    background: var(--color-gold);
    border-radius: 50%;
    animation: thinking-bounce 1.4s ease-in-out infinite both;
}

.thinking-dots span:nth-child(1) { animation-delay: -0.32s; }
.thinking-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes thinking-bounce {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1.2);
        opacity: 1;
    }
}

.thinking-text {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* AI消息内容 */
.ai-message {
    font-size: 15px;
    color: var(--color-text);
    word-wrap: break-word;
}

.ai-message h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-dark);
    margin: 20px 0 8px 0;
    padding-bottom: 4px;
    border-bottom: 2px solid var(--color-gold-light);
    display: inline-block;
}

.ai-message h3:first-child {
    margin-top: 0;
}

.ai-message p {
    margin: 8px 0;
}

.ai-message ul,
.ai-message ol {
    margin: 8px 0;
    padding-left: 20px;
}

.ai-message li {
    margin: 4px 0;
}

.ai-message strong {
    color: var(--color-dark);
    font-weight: 600;
}

.ai-message em {
    color: var(--color-gold-text);
    font-style: italic;
}

/* 光标 */
.ai-cursor {
    display: inline-block;
    font-size: 16px;
    color: var(--color-dark);
    animation: cursor-blink 0.8s infinite;
    font-weight: 300;
}

@keyframes cursor-blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* 底部操作栏 */
.ai-drawer-footer {
    border-top: 1px solid var(--color-border);
    padding: 16px 24px;
    flex-shrink: 0;
    background: var(--color-card-bg);
}

.ai-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.ai-btn {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-white);
    color: var(--color-text);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.ai-btn:hover {
    border-color: var(--color-dark);
}

.ai-btn-retry {
    background: var(--color-dark);
    color: var(--color-white);
    border-color: var(--color-dark);
}

.ai-btn-retry:hover {
    opacity: 0.9;
}

/* 反馈 */
.ai-feedback {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 8px 0;
    border-top: 1px solid var(--color-border);
    margin-bottom: 12px;
    padding-top: 12px;
}

.feedback-text {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.feedback-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: var(--transition);
}

.feedback-btn:hover {
    background: var(--color-border);
    transform: scale(1.1);
}

/* 设置提示 */
.ai-settings-hint {
    text-align: center;
    font-size: 12px;
    color: var(--color-text-light);
}

.ai-settings-hint a {
    color: var(--color-gold-text);
    text-decoration: none;
    font-weight: 500;
}

.ai-settings-hint a:hover {
    text-decoration: underline;
}

/* AI讲解按钮（通用） */
.ai-explain-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--color-dark), #3d5a70);
    color: var(--color-white);
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(44, 62, 80, 0.2);
}

.ai-explain-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.3);
}

.ai-explain-btn:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 16px;
}

.ai-explain-btn-wrap {
    margin: 16px 0;
    display: flex;
    justify-content: center;
    gap: 12px;
}

.practice-word-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--color-white);
    color: var(--color-dark);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.practice-word-btn:hover {
    background: var(--color-bg);
    border-color: var(--color-dark);
    transform: translateY(-1px);
}

.btn-check-word-meaning {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    padding: 8px 16px;
    background: var(--color-bg);
    color: var(--color-dark);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-check-word-meaning:hover {
    background: var(--color-white);
    border-color: var(--color-dark);
    transform: translateY(-1px);
}

.ai-analyze-btn-wrap {
    margin: 12px 0;
    text-align: center;
}

/* 设置页面 */
.settings-header {
    text-align: center;
    padding: 48px 0 24px;
}

.settings-header h1 {
    font-size: 28px;
    color: var(--color-dark);
    margin-bottom: 8px;
}

.settings-header p {
    color: var(--color-text-secondary);
    font-size: 15px;
}

.settings-card {
    background: var(--color-white);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}

.settings-card h2 {
    font-size: 18px;
    color: var(--color-dark);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

/* [v2.1新增] 设置页分区布局 */
.settings-section {
    background: var(--color-white);
    border-radius: var(--radius);
    margin-bottom: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.settings-section-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
}

.settings-section-icon {
    flex-shrink: 0;
    font-size: 24px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    border-radius: 50%;
}

.settings-section-titles {
    flex: 1;
    min-width: 0;
}

.settings-section-titles h2 {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-dark);
    margin: 0 0 2px;
    padding: 0;
    border: none;
}

.settings-section-titles p {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin: 0;
}

.settings-section-badge {
    flex-shrink: 0;
    font-size: 12px;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 12px;
    background: var(--color-bg);
    color: var(--color-text-secondary);
}

.settings-section-body {
    padding: 24px;
}

/* 账号区样式 */
.account-local-mode {
    text-align: center;
}

.account-hint {
    color: var(--color-text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.6;
}

#btn-account-login:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 账号区（Phase 2 匿名云同步） —— 仅新增 .account- 前缀类，沿用全局 CSS 变量主题，不改动既有组件 */
.account-badge--local {
    background: var(--color-surface-tertiary, #f0ede7);
    color: var(--color-text-secondary, #4a4a5a);
}
.account-badge--signed {
    background: var(--color-success-bg, #edf7f2);
    color: var(--color-success-text, #1a5c3a);
}
.account-uid {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text-primary, #1a1a2a);
    margin: 0 0 4px;
}
.account-hint {
    color: var(--color-text-secondary, #4a4a5a);
    font-size: 14px;
    margin: 0 0 16px;
    line-height: 1.6;
}
.account-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    border-top: 1px solid var(--color-border, #e8e2d8);
}
.account-toggle-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text, #1a1a2a);
}
/* 云端同步开关 */
.account-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    cursor: pointer;
}
.account-switch input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    margin: 0;
    cursor: pointer;
}
.account-switch-track {
    position: absolute;
    inset: 0;
    background: var(--color-disabled, #c8c5c0);
    border-radius: 999px;
    transition: background 0.2s;
}
.account-switch-track::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.2s;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}
.account-switch input:checked + .account-switch-track {
    background: var(--color-brand-jade, #3d8b6e);
}
.account-switch input:checked + .account-switch-track::after {
    transform: translateX(20px);
}
.account-switch input:focus-visible + .account-switch-track {
    box-shadow: 0 0 0 3px var(--color-focus-ring, rgba(74, 111, 165, 0.5));
}
.account-actions {
    margin-top: 8px;
}
.account-btn {
    font-size: 14px;
    padding: 9px 18px;
    border-radius: var(--radius, 12px);
    border: 1px solid var(--color-border, #e8e2d8);
    background: var(--color-surface-primary, #fff);
    color: var(--color-text-primary, #1a1a2a);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}
.account-btn:hover {
    background: var(--color-surface-tertiary, #f0ede7);
}
.account-btn--danger {
    border-color: var(--color-error-border, #e8a8aa);
    color: var(--color-error-text, #8b2529);
}
.account-btn--danger:hover {
    background: var(--color-error-bg, #fdf2f1);
}
.account-note {
    margin: 12px 0 0;
    font-size: 12px;
    color: var(--color-text-tertiary, #5f5f6f);
    line-height: 1.5;
}

/* 响应式：移动端调整 */
@media (max-width: 768px) {
    .settings-section-header {
        padding: 16px 18px;
        gap: 12px;
    }
    .settings-section-icon {
        width: 36px;
        height: 36px;
        font-size: 20px;
    }
    .settings-section-titles h2 {
        font-size: 16px;
    }
    .settings-section-titles p {
        font-size: 12px;
    }
    .settings-section-body {
        padding: 18px;
    }
}

.settings-item {
    margin-bottom: 20px;
}

.settings-item label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 8px;
}

.settings-select,
.settings-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 16px; /* [修复C-03] 防止iOS Safari自动缩放(需>=16px) */
    color: var(--color-text);
    background: var(--color-white);
    transition: var(--transition);
}

.settings-select:focus,
.settings-input:focus {
    outline: none;
    border-color: var(--color-dark);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
}

.api-key-input-wrapper {
    position: relative;
}

.api-key-input-wrapper .settings-input {
    padding-right: 48px;
}

.toggle-key-visibility {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    padding: 4px;
}

.settings-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.settings-actions .btn-primary,
.settings-actions .btn-secondary {
    flex: 1;
}

.settings-hint-text {
    margin-top: 8px;
    font-size: 12px;
    color: #666;
}

.settings-hint {
    margin-top: 16px;
    padding: 12px;
    border-radius: 8px;
    font-size: 13px;
    text-align: center;
    display: none;
}

.settings-hint.success {
    display: block;
    background: var(--color-success-bg);
    color: var(--color-success);
}

.settings-hint.error {
    display: block;
    background: var(--color-error-bg);
    color: var(--color-error);
}

/* AI模式选择卡片 */
.ai-mode-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 8px;
}

.ai-mode-card {
    position: relative;
    padding: 24px 20px;
    border: 2px solid var(--color-border);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    background: var(--color-white);
}

.ai-mode-card:hover {
    border-color: var(--color-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.ai-mode-card.active {
    border-color: var(--color-dark);
    background: linear-gradient(135deg, var(--color-surface-alt), #e9ecef);
}

.ai-mode-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.ai-mode-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 6px;
}

.ai-mode-desc {
    font-size: 12px;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.ai-mode-badge {
    position: absolute;
    top: -8px;
    right: 12px;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 600;
}

.ai-mode-badge.recommended {
    background: linear-gradient(135deg, var(--color-primary), var(--color-error));
    color: white;
}

.settings-divider {
    height: 1px;
    background: var(--color-border);
    margin: 0 0 20px 0;
}

.ai-provider-config {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px dashed var(--color-border);
}

.settings-advanced {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

.settings-advanced-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    padding: 8px 0;
    font-size: 14px;
    color: var(--color-text-secondary);
    -webkit-user-select: none;
    user-select: none;
}

.settings-advanced-toggle:hover {
    color: var(--color-text);
}

.toggle-arrow {
    font-size: 10px;
    transition: transform 0.2s;
}

.local-mode-tip {
    padding: 20px;
    background: var(--color-bg);
    border-radius: 8px;
    text-align: center;
}

.local-mode-tip p {
    margin: 8px 0;
    color: var(--color-text-secondary);
    font-size: 14px;
}

.local-mode-tip .btn-secondary {
    margin-top: 12px;
    width: 100%;
}

/* AI 网关状态卡片 */
.ai-status-card {
    padding: 16px;
    background: var(--color-bg);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.ai-status-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border-light, rgba(0,0,0,0.06));
}

.ai-status-row:last-child {
    border-bottom: none;
}

.ai-status-label {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.ai-status-value {
    font-size: 14px;
    color: var(--color-text);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.ai-status-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.ai-status-dot-ok {
    background: #22c55e;
}

.ai-status-dot-warning {
    background: #f59e0b;
}

.ai-status-dot-error {
    background: #ef4444;
}

.ai-status-dot-loading {
    background: #94a3b8;
    animation: ai-status-pulse 1.2s infinite;
}

@keyframes ai-status-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* 响应式 */
@media (max-width: 768px) {
    .ai-mode-cards {
        grid-template-columns: 1fr;
    }
    
    .settings-card {
        padding: 20px;
    }
    .ai-drawer {
        width: 100%;
    }
    
    .ai-drawer-header {
        padding: 16px 20px;
    }
    
    .ai-drawer-content {
        padding: 20px;
    }
    
    .ai-drawer-footer {
        padding: 12px 20px;
    }
    
    .settings-header {
        padding: 32px 0 16px;
    }
    
    .settings-header h1 {
        font-size: 24px;
    }
    
    .settings-card {
        padding: 20px;
    }
    
    .settings-actions {
        flex-direction: column;
    }
}

/* =============================================
   首页专用样式
   设计方向：古典雅致 · 书卷气 · 东方美学
   ============================================= */

/* === 首页每日一词（横向卡片，融入首页首屏） === */
.home-daily {
    padding-top: 32px;
    animation: homeFadeIn 0.6s ease;
}

.home-daily-inner {
    background: linear-gradient(175deg, #faf8f3 0%, #f5f0e6 40%, #efe9dd 100%);
    border-radius: 16px;
    padding: 32px;
    display: flex;
    align-items: center;
    gap: 28px;
    position: relative;
    overflow: hidden;
    box-shadow:
        0 4px 24px rgba(44, 62, 80, 0.06),
        0 1px 3px rgba(44, 62, 80, 0.03);
}

/* 宣纸纹理 */
.home-daily-inner::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background:
        radial-gradient(ellipse at 85% 15%, rgba(180, 160, 120, 0.08) 0%, transparent 45%),
        radial-gradient(ellipse at 10% 85%, rgba(180, 160, 120, 0.06) 0%, transparent 45%);
    pointer-events: none;
}

/* 细线装饰边框 */
.home-daily-inner::after {
    content: '';
    position: absolute;
    top: 10px;
    right: 10px;
    bottom: 10px;
    left: 10px;
    border: 1px solid rgba(180, 160, 120, 0.15);
    border-radius: 10px;
    pointer-events: none;
}

.home-daily-left {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.home-daily-label {
    display: flex;
    align-items: center;
    gap: 8px;
}

.home-daily-tag {
    display: inline-block;
    background: var(--color-dark);
    color: var(--color-white);
    font-size: 11px;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 10px;
    letter-spacing: 1px;
}

.home-daily-date {
    font-size: 13px;
    color: var(--color-text-light);
}

.home-daily-char {
    width: 96px;
    height: 96px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 56px;
    font-family: var(--font-serif);
    font-weight: 700;
    color: var(--color-dark);
    background: rgba(255, 255, 255, 0.6);
    border-radius: 14px;
    position: relative;
    /* 米字格底纹 */
    background-image:
        linear-gradient(rgba(180, 160, 120, 0.15) 1px, transparent 1px),
        linear-gradient(90deg, rgba(180, 160, 120, 0.15) 1px, transparent 1px);
    background-size: 32px 32px;
    background-position: center;
}

.home-daily-char::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background:
        linear-gradient(45deg, rgba(180, 160, 120, 0.1) 1px, transparent 1px),
        linear-gradient(-45deg, rgba(180, 160, 120, 0.1) 1px, transparent 1px);
    background-size: 45px 45px;
    background-position: center;
    border-radius: 14px;
}

.home-daily-right {
    flex: 1;
    min-width: 0;
    position: relative;
    z-index: 1;
}

.home-daily-pinyin {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: 4px;
    font-style: italic;
}

.home-daily-star {
    font-size: 16px;
    color: var(--color-star);
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.home-daily-meaning {
    font-size: 15px;
    color: var(--color-text);
    line-height: 1.7;
    margin-bottom: 8px;
}

.home-daily-example {
    font-size: 13px;
    color: var(--color-text-light);
    line-height: 1.6;
    font-family: var(--font-serif);
    padding-left: 12px;
    border-left: 2px solid rgba(180, 160, 120, 0.3);
}

.home-daily-source {
    font-size: 11px;
    color: var(--color-text-light);
    font-family: var(--font-main);
    opacity: 0.7;
    margin-right: 4px;
}

.home-daily-actions {
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.home-daily-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(180, 160, 120, 0.2);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.home-daily-btn:hover {
    background: rgba(255, 255, 255, 0.8);
    border-color: rgba(180, 160, 120, 0.4);
    color: var(--color-dark);
    transform: translateX(2px);
}

.home-daily-btn svg {
    transition: transform 0.25s ease;
}

.home-daily-btn:hover svg {
    transform: translateX(3px);
}

/* === 搜索框样式升级（首页内联版） === */
.home-search .search-box {
    max-width: 520px;
}

.home-search .search-input {
    height: 52px;
    font-size: 18px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.7);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border: 1.5px solid var(--color-border);
    transition: var(--transition);
}

.home-search .search-input:focus {
    border-color: var(--color-dark);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.08), 0 4px 16px rgba(0, 0, 0, 0.04);
    background: var(--color-white);
}

.home-search .search-btn {
    height: 52px;
    border-radius: 10px;
    padding: 0 28px;
    font-size: 15px;
}

/* === 功能导航卡片 === */
.home-features {
    margin-top: 36px;
    animation: homeFadeIn 0.6s ease 0.15s both;
}

.home-features-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.home-features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.feature-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--color-white);
    border-radius: 14px;
    border: 1px solid var(--color-border);
    text-decoration: none;
    color: var(--color-text);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.feature-card-badge {
    position: absolute;
    top: 0;
    right: 0;
    padding: 3px 10px;
    background: var(--color-highlight);
    color: var(--color-white);
    font-size: 10px;
    font-weight: 600;
    border-radius: 0 14px 0 6px;
    z-index: 1;
}

.feature-card.featured {
    border-color: var(--color-highlight);
    box-shadow: 0 2px 12px rgba(231, 76, 60, 0.1);
}

.feature-card.featured:hover {
    border-color: var(--color-highlight);
    box-shadow: 0 4px 20px rgba(231, 76, 60, 0.15);
}

.feature-card.featured .feature-card-icon {
    background: var(--color-highlight);
    color: var(--color-white);
}

.feature-card.featured:hover .feature-card-icon {
    background: #c0392b;
    color: var(--color-white);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-gold);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    border-color: var(--color-dark);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card-icon {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-card-bg);
    border-radius: 12px;
    color: var(--color-dark);
    transition: var(--transition);
}

.feature-card:hover .feature-card-icon {
    background: var(--color-dark);
    color: var(--color-white);
}

.feature-card-body {
    flex: 1;
    min-width: 0;
}

.feature-card-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 2px;
}

.feature-card-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 2px;
}

.feature-card-meta {
    font-size: 12px;
    color: var(--color-text-light);
}

.feature-card-arrow {
    flex-shrink: 0;
    color: var(--color-text-light);
    transition: var(--transition);
}

.feature-card:hover .feature-card-arrow {
    color: var(--color-dark);
    transform: translateX(3px);
}

/* === 新用户引导横幅 (UX8) === */
.onboarding-banner {
    margin-top: 24px;
    animation: homeFadeIn 0.5s ease 0.4s both;
}
.onboarding-content {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 20px;
    background: linear-gradient(135deg, var(--color-gold-light), var(--color-card-bg));
    border: 1px solid var(--color-gold);
    border-radius: var(--radius);
    position: relative;
}
.onboarding-icon {
    font-size: 28px;
    flex-shrink: 0;
    line-height: 1.4;
}
.onboarding-text {
    flex: 1;
    min-width: 0;
}
.onboarding-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-gold-text);
    margin-bottom: 4px;
}
.onboarding-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}
.onboarding-dismiss {
    position: absolute;
    top: 8px;
    right: 8px;
    background: none;
    border: none;
    font-size: 16px;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--transition);
    line-height: 1;
}
.onboarding-dismiss:hover {
    background: rgba(0, 0, 0, 0.06);
    color: var(--color-text);
}
.onboarding-banner.fade-out {
    animation: onboardFadeOut 0.3s ease forwards;
}
@keyframes onboardFadeOut {
    to { opacity: 0; transform: translateY(-8px); }
}

/* === 热门查询区（首页版，更紧凑） === */
.home .hot-words {
    margin-top: 40px;
    animation: homeFadeIn 0.6s ease 0.25s both;
}

.hot-words-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.hot-words-header h2 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-dark);
}

.hot-words-count {
    font-size: 12px;
    color: var(--color-text-light);
}

/* === 数据亮点 === */
.home-data-highlights {
    margin: 40px 0 20px;
    padding: 28px 32px;
    background: var(--color-dark);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    animation: homeFadeIn 0.6s ease 0.35s both;
}

.data-highlight-item {
    flex: 1;
    text-align: center;
    padding: 0 16px;
}

.data-highlight-num {
    font-size: 32px;
    font-weight: 800;
    color: var(--color-gold-text);
    line-height: 1.2;
    font-family: var(--font-serif);
}

.data-highlight-unit {
    font-size: 16px;
    font-weight: 600;
    opacity: 0.8;
}

.data-highlight-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 4px;
}

.data-highlight-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.15);
    flex-shrink: 0;
}

/* [v2.2修复] B-06: 今日学习路径 */
.home-today-path {
    max-width: 860px;
    margin: 24px auto 0;
    padding: 20px 24px;
    background: var(--color-surface-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border-left: 3px solid var(--color-brand-indigo);
}

.home-today-path-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-brand-ink);
    margin-bottom: 12px;
}

.home-today-path-items {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.today-path-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--color-surface-secondary);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--color-text-primary);
    font-size: 14px;
    transition: background 0.2s;
}

.today-path-item:hover {
    background: var(--color-surface-elevated);
}

.today-path-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.today-path-text {
    flex: 1;
}

.today-path-arrow {
    color: var(--color-text-tertiary);
    font-size: 13px;
}

@media (max-width: 768px) {
    .home-today-path {
        margin-top: 16px;
        padding: 16px 20px;
    }
}

/* === 首页搜索结果区域 === */
.home .search-result {
    padding: 0 0 16px;
    animation: fadeInUp 0.4s ease;
}

/* === 首页入场动画 === */
@keyframes homeFadeIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* === 首页响应式 === */
@media (max-width: 768px) {
    .home-daily {
        padding-top: 20px;
    }

    .home-daily-inner {
        flex-direction: column;
        padding: 24px;
        text-align: center;
        gap: 20px;
    }

    .home-daily-left {
        flex-direction: row;
    }

    .home-daily-char {
        width: 80px;
        height: 80px;
        font-size: 44px;
    }

    .home-daily-actions {
        width: 100%;
    }

    .home-daily-btn {
        width: 100%;
        justify-content: center;
    }

    .home-daily-example {
        border-left: none;
        padding-left: 0;
        text-align: center;
    }

    .home-features-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .feature-card {
        padding: 16px;
    }

    .home-data-highlights {
        flex-direction: column;
        padding: 24px;
        gap: 20px;
    }

    .data-highlight-divider {
        width: 40px;
        height: 1px;
    }

    .home-search-title {
        font-size: 20px;
    }

    .home-search .search-box {
        flex-direction: column;
    }

    .home-search .search-input,
    .home-search .search-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .home-daily-char {
        width: 68px;
        height: 68px;
        font-size: 38px;
    }

    .data-highlight-num {
        font-size: 28px;
    }

    .feature-card-icon {
        width: 48px;
        height: 48px;
    }

    .feature-card-icon svg {
        width: 26px;
        height: 26px;
    }
}

/* ==================== 断句题样式 (Punctuation Question) ==================== */
.pj-raw-text {
    background: linear-gradient(135deg, #fdf6e3 0%, #fef9ef 100%);
    border: 1px solid #e8d5b7;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    text-align: center;
}

.pj-label {
    font-size: 14px;
    color: #8b7355;
    margin-bottom: 12px;
    font-weight: 500;
}

.pj-characters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2px;
    line-height: 1.8;
}

.pj-char {
    font-size: 22px;
    color: #2c3e50;
    font-family: "KaiTi", "楷体", "STKaiti", serif;
    padding: 2px 1px;
    letter-spacing: 2px;
}

.pj-option-text {
    font-family: "KaiTi", "楷体", "STKaiti", serif;
    font-size: 16px;
    letter-spacing: 1px;
    line-height: 1.6;
}

.pj-break {
    display: inline-block;
    color: var(--color-error);
    font-weight: bold;
    font-size: 20px;
    margin: 0 2px;
    vertical-align: middle;
    text-shadow: 0 0 4px rgba(231, 76, 60, 0.3);
}

/* ==================== 比较阅读题样式 (Comparative Reading) ==================== */
.cr-passages {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 16px;
}

.cr-passage {
    background: var(--color-surface-alt);
    border-left: 4px solid var(--color-info);
    border-radius: 0 8px 8px 0;
    padding: 14px 16px;
    position: relative;
}

.cr-passage:nth-child(2) {
    border-left-color: #e67e22;
}

.cr-passage-label {
    font-size: 14px;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.cr-passage-source {
    font-size: 12px;
    color: #7f8c8d;
    font-weight: 400;
}

.cr-passage-text {
    font-size: 16px;
    line-height: 1.8;
    color: #34495e;
    font-family: "KaiTi", "楷体", "STKaiti", serif;
}

.cr-stem {
    background: linear-gradient(135deg, #eef2f7 0%, #e8edf5 100%);
    border: 1px solid #d1d9e6;
    border-radius: 10px;
    padding: 14px 18px;
    margin-bottom: 16px;
    font-size: 15px;
    font-weight: 600;
    color: #2c3e50;
    line-height: 1.6;
}

/* 断句题和比较阅读题的响应式适配 */
@media (max-width: 768px) {
    .pj-char {
        font-size: 18px;
    }
    .pj-option-text {
        font-size: 14px;
    }
    .cr-passage-text {
        font-size: 15px;
    }
    .cr-stem {
        font-size: 14px;
        padding: 12px 14px;
    }
}

/* ==================== 过渡题型样式 (Transition Questions) ==================== */
.transition-question {
    margin-bottom: 16px;
}

.transition-sentence {
    background: linear-gradient(135deg, var(--color-surface-secondary) 0%, var(--color-surface-tertiary) 100%);
    border: 1px solid #d4c5f9;
    border-radius: 12px;
    padding: 20px 24px;
    text-align: center;
    margin-bottom: 10px;
}

.transition-sentence em {
    font-style: normal;
    font-weight: 700;
    color: var(--color-brand-vermilion);
    text-decoration: underline wavy var(--color-brand-vermilion);
    text-underline-offset: 4px;
}

.transition-source {
    text-align: center;
    font-size: 13px;
    color: #95a5a6;
    margin-bottom: 12px;
}

.transition-stem {
    background: linear-gradient(135deg, var(--color-surface-tertiary) 0%, var(--color-surface-secondary) 100%);
    border: 1px solid #d1d9e6;
    border-radius: 10px;
    padding: 12px 16px;
    font-size: 15px;
    font-weight: 600;
    color: #2c3e50;
    line-height: 1.6;
}

/* 过渡题型响应式适配 */
@media (max-width: 768px) {
    .transition-sentence {
        font-size: 16px;
        padding: 16px;
    }
    .transition-stem {
        font-size: 14px;
        padding: 10px 14px;
    }
}

/* ==================== 退出练习按钮 & 确认弹窗 ==================== */
.btn-exit-practice {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 36px;
    padding: 0 16px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-white);
    color: var(--color-text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.btn-exit-practice:hover {
    background: var(--color-bg);
    color: var(--color-highlight);
    border-color: var(--color-highlight);
}

.btn-exit-practice:active {
    transform: scale(0.98);
}

/* 弹窗遮罩 */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: modalFadeIn 0.2s ease;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* 弹窗卡片 */
.modal-card {
    background: #fff;
    border-radius: 16px;
    padding: 32px;
    max-width: 380px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    text-align: center;
    animation: modalSlideIn 0.25s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-icon {
    color: var(--color-star);
    margin-bottom: 16px;
}

.modal-title {
    font-size: 18px;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 8px;
}

.modal-desc {
    font-size: 14px;
    color: #5a6364;
    line-height: 1.6;
    margin-bottom: 24px;
}

.modal-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.modal-actions .btn-primary,
.modal-actions .btn-secondary {
    width: 100%;
    padding: 12px;
    font-size: 15px;
    border-radius: 10px;
}

/* 弹窗移动端适配 */
@media (max-width: 768px) {
    .modal-card {
        padding: 24px 20px;
        max-width: 320px;
    }
    .modal-title {
        font-size: 16px;
    }
    .modal-desc {
        font-size: 13px;
    }
    .btn-exit-practice {
        padding: 0 12px;
        font-size: 12px;
    }
}

/* ==================== Toast通知样式 ==================== */
.toast-container {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}

.toast {
    background: #fff;
    color: #333;
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    font-size: 14px;
    max-width: 90vw;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s, transform 0.3s;
    pointer-events: auto;
    border-left: 4px solid var(--color-info);
}

.toast-show {
    opacity: 1;
    transform: translateY(0);
}

.toast-hide {
    opacity: 0;
    transform: translateY(-10px);
}

.toast-info {
    border-left-color: var(--color-info);
}

.toast-warning {
    border-left-color: var(--color-star);
    background: #fffbf0;
}

.toast-error {
    border-left-color: var(--color-error);
    background: #fff5f5;
}

.toast-success {
    border-left-color: #2ecc71;
    background: #f0fff4;
}

@media (max-width: 768px) {
    .toast-container {
        top: 70px;
    }
    .toast {
        font-size: 13px;
        padding: 10px 16px;
    }
}

/* 例句中的字可点击跳查字典 */
.eg-word {
    cursor: pointer;
    border-bottom: 1px dashed transparent;
    transition: color 150ms ease, border-color 150ms ease;
}
.eg-word:hover {
    color: var(--color-gold-text);
    border-bottom-color: var(--color-gold-text);
}
.eg-word:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* --- 提前完成提示 --- */
.early-finish-hint {
    margin-top: 12px;
    padding: 12px 16px;
    background: linear-gradient(135deg, var(--color-success-bg), #c8e6c9);
    border-radius: 10px;
    border: 1px solid #a5d6a7;
}
.early-finish-title {
    font-weight: 600;
    color: var(--color-step-done);
    margin-bottom: 4px;
}
.early-finish-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}
.early-finish-btn {
    background: var(--color-step-done) !important;
    margin-right: 8px;
}

/* --- AI配置提示 --- */
.ai-config-hint {
    background: var(--color-warning-bg);
    border: 1px solid #ff9800;
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 16px;
    color: var(--color-warning-text);
    font-size: 14px;
    line-height: 1.6;
}
.ai-config-hint a {
    color: var(--color-info);
    text-decoration: underline;
    font-weight: bold;
}

/* ========================================
   暗色模式 - 组件级覆盖
   针对使用硬编码颜色（渐变、阴影、复杂背景）
   无法通过 CSS 变量自动适配的组件
   ======================================== */

/* --- 每日一词分享卡片 --- */
[data-theme="dark"] .daily-share-card {
    background: linear-gradient(175deg, #2c3038 0%, #1e2428 40%, #1a2024 100%);
    box-shadow:
        0 4px 24px rgba(0, 0, 0, 0.3),
        0 1px 3px rgba(0, 0, 0, 0.2),
        inset 0 0 60px rgba(200, 180, 140, 0.03);
}
[data-theme="dark"] .daily-share-card::before {
    background:
        radial-gradient(ellipse at 20% 10%, rgba(200, 180, 140, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 90%, rgba(200, 180, 140, 0.03) 0%, transparent 50%);
}
[data-theme="dark"] .daily-share-card::after {
    border-color: rgba(200, 180, 140, 0.12);
}
[data-theme="dark"] .daily-share-card .card-bg-mountains { opacity: 0.06; }
[data-theme="dark"] .daily-share-card .card-seal {
    color: var(--color-error);
    border-color: var(--color-error);
    opacity: 0.7;
}
[data-theme="dark"] .daily-share-card .card-date-label { color: #8a8070; }
[data-theme="dark"] .daily-share-card .card-date-value { color: #9a9080; }
[data-theme="dark"] .card-char { color: #f0ebe4; }
[data-theme="dark"] .card-pinyin { color: #b0a898; }
[data-theme="dark"] .card-star { color: var(--color-error); opacity: 0.8; }
[data-theme="dark"] .daily-share-card .card-divider {
    background: linear-gradient(to right, transparent, rgba(200, 180, 140, 0.15), transparent);
}
[data-theme="dark"] .daily-share-card .daily-meaning-seq { color: #8a8070; }
[data-theme="dark"] .daily-meaning-content { color: #d0c8b8; }
[data-theme="dark"] .daily-share-card .daily-meaning-example {
    color: #8a8070;
    border-left-color: rgba(200, 180, 140, 0.15);
}
[data-theme="dark"] .daily-share-card .daily-meaning-source {
    color: #7a7060;
}
[data-theme="dark"] .daily-share-card .card-example {
    background: rgba(255, 253, 248, 0.04);
    border-left-color: rgba(200, 180, 140, 0.15);
}
[data-theme="dark"] .daily-example-sentence { color: #d0c8b8; }
[data-theme="dark"] .daily-share-card .daily-example-source { color: #7a7060; }
[data-theme="dark"] .daily-share-card .card-footer-line { background: rgba(200, 180, 140, 0.12); }
[data-theme="dark"] .card-footer-text { color: #9a8a7a; }

/* --- 首页每日一词横向卡片 --- */
[data-theme="dark"] .home-daily-inner {
    background: linear-gradient(175deg, #2a2826 0%, #242220 40%, #1e1c1a 100%);
    box-shadow:
        0 4px 24px rgba(0, 0, 0, 0.25),
        0 1px 3px rgba(0, 0, 0, 0.15);
}
[data-theme="dark"] .home-daily-inner::before {
    background:
        radial-gradient(ellipse at 85% 15%, rgba(200, 180, 140, 0.05) 0%, transparent 45%),
        radial-gradient(ellipse at 10% 85%, rgba(200, 180, 140, 0.04) 0%, transparent 45%);
}
[data-theme="dark"] .home-daily-inner::after {
    border-color: rgba(200, 180, 140, 0.1);
}
[data-theme="dark"] .home-daily-char {
    background: rgba(36, 34, 32, 0.6);
    background-image:
        linear-gradient(rgba(200, 180, 140, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(200, 180, 140, 0.1) 1px, transparent 1px);
    background-size: 32px 32px;
}
[data-theme="dark"] .home-daily-char::before {
    background:
        linear-gradient(45deg, rgba(200, 180, 140, 0.06) 1px, transparent 1px),
        linear-gradient(-45deg, rgba(200, 180, 140, 0.06) 1px, transparent 1px);
    background-size: 45px 45px;
}
[data-theme="dark"] .home-daily-btn {
    background: rgba(42, 40, 38, 0.5);
    border-color: rgba(200, 180, 140, 0.15);
}
[data-theme="dark"] .home-daily-btn:hover {
    background: rgba(42, 42, 62, 0.8);
    border-color: rgba(200, 180, 140, 0.3);
}
[data-theme="dark"] .home-search .search-input {
    background: rgba(42, 42, 62, 0.7);
}
[data-theme="dark"] .home-search .search-input:focus {
    background: var(--color-white);
}

/* --- 前序步骤摘要 --- */
[data-theme="dark"] .prior-steps-summary {
    background: linear-gradient(135deg, #242838 0%, #1e2230 100%);
    border-color: #3a3a4e;
}
[data-theme="dark"] .prior-steps-summary .summary-sentence {
    color: #e8e6e3;
    border-bottom-color: #3a3a4e;
}
[data-theme="dark"] .prior-steps-summary .summary-title { color: #8a8a9a; }
[data-theme="dark"] .prior-steps-summary .summary-answer { color: #b0b0b0; }
[data-theme="dark"] .prior-steps-summary .summary-divider { background: #3a3a4e; }

/* --- 步骤历史 --- */
[data-theme="dark"] .step-history-header .history-step-result { color: #a0a0a0; }
[data-theme="dark"] .step-history-header .history-eval-badge.partial {
    background: #2e2a1e;
    color: #fbbf24;
}
[data-theme="dark"] .step-history-header .history-eval-badge.incorrect {
    background: #2e1a1a;
    color: #fca5a5;
}
[data-theme="dark"] .step-history-header .history-eval-badge.skipped {
    background: #282624;
    color: #9a948c;
}
[data-theme="dark"] .step-history-body { border-top-color: #4a463f; }
[data-theme="dark"] .step-history-section { color: #b0b0b0; }
[data-theme="dark"] .step-history-section .section-label { color: #d4d4d4; }
[data-theme="dark"] .step-history-section.user-answer-text {
    background: #1e1c1a;
    border-left-color: #5a4a3a;
}
[data-theme="dark"] .step-history-item .step-history-header:hover {
    background: rgba(255, 255, 255, 0.03);
}

/* --- 评分步骤项 --- */
[data-theme="dark"] .score-step-item.skipped {
    background: #282624;
    color: #9a948c;
}
[data-theme="dark"] .score-step-item.early-finish {
    background: #2a2820;
    color: #d4c4a8;
}

/* --- 选项正确/错误反馈渐变 --- */
[data-theme="dark"] .option-item.correct {
    background: linear-gradient(135deg, var(--color-success-bg) 0%, #1a3a2a 100%);
}

/* =========================================================================
   个性化学习系统样式（独立前缀 .identity- / .mastery-，不污染已有选择器）
   规范依据：个性化学习系统开发规范.md v2.0 §2.5 规则 5
   ========================================================================= */

/* --- 首页身份引导卡片 --- */
.identity-guide-card {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, var(--color-surface-elevated) 0%, var(--color-surface-secondary) 100%);
    border: 1px solid var(--color-brand-indigo);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 12px;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.12);
    animation: identity-fade-in 0.4s ease;
}
.identity-guide-inner {
    display: flex;
    align-items: center;
    gap: 16px;
}
.identity-guide-icon {
    font-size: 40px;
    flex-shrink: 0;
}
.identity-guide-body {
    flex: 1;
    min-width: 0;
}
.identity-guide-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 4px;
}
.identity-guide-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
    line-height: 1.5;
}
.identity-guide-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.identity-guide-btn {
    cursor: pointer;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    padding: 8px 16px;
    transition: var(--transition);
}
.identity-guide-btn--primary {
    background: var(--color-brand-indigo);
    color: #fff;
}
.identity-guide-btn--primary:hover {
    background: #4f46e5;
    transform: translateY(-1px);
}
.identity-guide-btn--link {
    background: transparent;
    color: var(--color-text-secondary);
    text-decoration: underline;
    padding: 8px 12px;
}
@keyframes identity-fade-in {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- 身份选择对话框 --- */
.identity-dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(4px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: identity-fade-in 0.2s ease;
}
.identity-dialog {
    background: var(--color-surface-primary);
    border-radius: 20px;
    padding: 28px 24px;
    max-width: 440px;
    width: calc(100% - 32px);
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: identity-dialog-pop 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes identity-dialog-pop {
    from { transform: scale(0.92); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
.identity-dialog-close {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 32px;
    height: 32px;
    border: none;
    background: var(--color-surface-tertiary);
    border-radius: 50%;
    font-size: 22px;
    line-height: 1;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: background 0.2s;
}
.identity-dialog-close:hover {
    background: var(--color-hover-overlay);
}
.identity-dialog-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0 0 6px;
}
.identity-dialog-subtitle {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin: 0 0 20px;
}
.identity-dialog-step--hidden {
    display: none;
}
.identity-step-label {
    font-size: 15px;
    color: var(--color-text-primary);
    margin-bottom: 12px;
    font-weight: 500;
}
.identity-role-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}
.identity-role-card {
    background: var(--color-surface-secondary);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 18px 10px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}
.identity-role-card:hover {
    border-color: var(--color-brand-indigo);
    background: var(--color-surface-elevated);
    transform: translateY(-2px);
}
.identity-role-icon {
    font-size: 30px;
}
.identity-role-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
}
.identity-grade-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 16px;
}
.identity-grade-card {
    background: var(--color-surface-secondary);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 20px 16px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text-primary);
    transition: var(--transition);
}
.identity-grade-card:hover {
    border-color: var(--color-brand-indigo);
    background: var(--color-surface-elevated);
    transform: translateY(-2px);
}
.identity-semester-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 16px;
}
.identity-semester-card {
    background: var(--color-surface-secondary);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 20px 16px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text-primary);
    transition: var(--transition);
}
.identity-semester-card:hover {
    border-color: var(--color-brand-indigo);
    background: var(--color-surface-elevated);
    transform: translateY(-2px);
}
.identity-back-btn {
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 13px;
    padding: 6px 0;
}
.identity-back-btn:hover {
    color: var(--color-text-primary);
}

/* --- 设置页身份管理区 --- */
.identity-settings-card {
    margin-top: 0;
}
.identity-settings-body {
    margin-top: 16px;
}
.identity-current {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    padding: 12px 16px;
    background: var(--color-surface-secondary);
    border-radius: 10px;
}
.identity-current-label {
    font-size: 14px;
    color: var(--color-text-secondary);
}
.identity-current-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-brand-indigo);
}
.identity-prefs {
    margin-bottom: 16px;
}

/* --- 掌握度展示（字词查询/每日一词卡片共用） --- */
.mastery-dot {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 500;
    line-height: 1.4;
    margin-left: 8px;
    vertical-align: middle;
}
.mastery-dot::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
}
.mastery-dot--new {
    background: var(--color-surface-tertiary);
    color: var(--color-text-tertiary);
}
.mastery-dot--learning {
    background: var(--color-info-bg);
    color: var(--color-info);
}
.mastery-dot--review {
    background: var(--color-warning-bg);
    color: var(--color-warning);
}
.mastery-dot--mastered {
    background: var(--color-success-bg);
    color: var(--color-success);
}
.mastery-label {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-left: 8px;
}
.mastery-due-time {
    font-size: 11px;
    color: var(--color-text-tertiary);
    margin-left: 4px;
}

/* --- 首页掌握度分布条 --- */
.home-mastery-distribution {
    margin-top: 16px;
    padding: 14px 16px;
    background: var(--color-surface-secondary);
    border-radius: 12px;
}
.mastery-bar {
    display: flex;
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
    background: var(--color-surface-tertiary);
    margin-bottom: 10px;
}
.mastery-bar-seg {
    height: 100%;
    transition: width 0.4s ease;
}
.mastery-bar-seg.mastery-dot--mastered { background: var(--color-success); }
.mastery-bar-seg.mastery-dot--review   { background: var(--color-warning); }
.mastery-bar-seg.mastery-dot--learning { background: var(--color-info); }
.mastery-bar-seg.mastery-dot--new      { background: var(--color-surface-tertiary); }
.mastery-bar-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 12px;
    font-size: 12px;
}
.mastery-bar-legend .mastery-dot {
    margin-left: 0;
    padding: 2px 6px;
}

/* --- 暗色主题微调 --- */
[data-theme="dark"] .identity-guide-card {
    background: linear-gradient(135deg, #1e1b4b 0%, #1a2438 100%);
    border-color: #4f46e5;
}
[data-theme="dark"] .identity-role-card,
[data-theme="dark"] .identity-grade-card,
[data-theme="dark"] .identity-semester-card {
    background: #2a3447;
}
[data-theme="dark"] .identity-role-card:hover,
[data-theme="dark"] .identity-grade-card:hover,
[data-theme="dark"] .identity-semester-card:hover {
    background: #374151;
}
[data-theme="dark"] .identity-current {
    background: #1f2937;
}

/* --- 响应式 --- */
@media (max-width: 480px) {
    .identity-guide-inner {
        flex-direction: column;
        text-align: center;
    }
    .identity-role-cards {
        grid-template-columns: 1fr;
    }
    .identity-grade-grid {
        grid-template-columns: 1fr;
    }
}
[data-theme="dark"] .option-item.wrong {
    background: linear-gradient(135deg, var(--color-error-bg) 0%, #3a1a1a 100%);
}

/* --- 错题列表字词高亮 --- */
[data-theme="dark"] .wrong-item-word {
    background: #3a1e1e;
}

/* --- 断句题 --- */
[data-theme="dark"] .pj-raw-text {
    background: linear-gradient(135deg, #2a2820 0%, #242218 100%);
    border-color: #4a4030;
}
[data-theme="dark"] .pj-label { color: #b0a080; }
[data-theme="dark"] .pj-char { color: #d4d4d4; }

/* --- 比较阅读题 --- */
[data-theme="dark"] .cr-passage {
    background: var(--color-surface-alt);
}
[data-theme="dark"] .cr-passage:nth-child(2) {
    border-left-color: #e67e22;
}
[data-theme="dark"] .cr-passage-label { color: #d4d4d4; }
[data-theme="dark"] .cr-passage-source { color: #8a8a9a; }
[data-theme="dark"] .cr-passage-text { color: #c0c0c0; }
[data-theme="dark"] .cr-stem {
    background: linear-gradient(135deg, #242838 0%, #1e2230 100%);
    border-color: #3a3a4e;
    color: #d4d4d4;
}

/* --- 过渡题型 --- */
[data-theme="dark"] .transition-sentence {
    background: linear-gradient(135deg, var(--color-surface-secondary) 0%, var(--color-surface-tertiary) 100%);
    border-color: #4a3a6e;
}
[data-theme="dark"] .transition-source { color: #8a8a9a; }
[data-theme="dark"] .transition-stem {
    background: linear-gradient(135deg, var(--color-surface-tertiary) 0%, var(--color-surface-secondary) 100%);
    border-color: #3a3a4e;
    color: #d4d4d4;
}

/* --- Modal 弹窗 --- */
[data-theme="dark"] .modal-overlay {
    background: rgba(0, 0, 0, 0.7);
}
[data-theme="dark"] .modal-card {
    background: var(--color-surface-elevated);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}
[data-theme="dark"] .modal-title { color: #e8e6e3; }

/* --- Toast 通知 --- */
[data-theme="dark"] .toast {
    background: var(--color-surface-elevated);
    color: #d4d4d4;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}
[data-theme="dark"] .toast-info {
    background: #242838;
}
[data-theme="dark"] .toast-success {
    background: #1e2e1e;
}
[data-theme="dark"] .toast-warning {
    background: #2e2a1e;
}
[data-theme="dark"] .toast-error {
    background: #2e1e1e;
}

/* --- 提前完成提示 --- */
[data-theme="dark"] .early-finish-hint {
    background: linear-gradient(135deg, var(--color-success-bg), #1e3a1e);
    border-color: #2e5a2e;
}

/* --- AI配置提示 --- */
[data-theme="dark"] .ai-config-hint {
    border-color: #b36b00;
}

/* --- Toast 成功状态边框 --- */
[data-theme="dark"] .toast-success {
    border-left-color: #4ade80;
}

/* --- AI 讲解抽屉 --- */
[data-theme="dark"] .ai-drawer {
    background: var(--color-surface-primary);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.4);
}
[data-theme="dark"] .ai-drawer-overlay {
    background: rgba(0, 0, 0, 0.7);
}
[data-theme="dark"] .ai-mode-card.active {
    background: linear-gradient(135deg, var(--color-surface-alt), #2a2a3e);
}

/* --- 退出练习按钮 hover --- */
[data-theme="dark"] .btn-exit-practice:hover {
    background: #3a3a4e;
    border-color: #5a5a7e;
}

/* --- 搜索按钮和主按钮 hover 态 --- */
[data-theme="dark"] .search-btn:hover,
[data-theme="dark"] .btn-primary:hover {
    background: #4a5568;
}

/* --- 输入框和文本域 --- */
[data-theme="dark"] input,
[data-theme="dark"] textarea,
[data-theme="dark"] select {
    background: #2a2a3e;
    color: #d4d4d4;
    border-color: #3a3a4e;
}
[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder {
    color: #6a6a7e;
}

/* --- 滚动条 --- */
[data-theme="dark"] ::-webkit-scrollbar-track { background: #1a1a2e; }
[data-theme="dark"] ::-webkit-scrollbar-thumb { background: #3a3a4e; }
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover { background: #4a4a5e; }

/* --- 焦点态 box-shadow 覆盖 --- */
[data-theme="dark"] .search-input:focus,
[data-theme="dark"] .settings-select:focus,
[data-theme="dark"] .settings-input:focus {
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.15);
}

[data-theme="dark"] .answer-input:focus {
    box-shadow: 0 0 0 4px rgba(201, 169, 108, 0.15), inset 0 1px 3px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .answer-input {
    background: #2a2a3e;
    border-color: #3a3a4e;
    color: #d4d4d4;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] .answer-input::placeholder {
    color: #6a6a7e;
}

/* --- 新用户引导横幅 --- */
[data-theme="dark"] .onboarding-content {
    background: linear-gradient(135deg, #2a2820, #242438);
    border-color: #5a4a2a;
}
[data-theme="dark"] .onboarding-dismiss:hover {
    background: rgba(255, 255, 255, 0.08);
}

/* --- 第三轮审查修复：暗色模式下对比度覆盖 --- */
[data-theme="dark"] .eg-grade {
    color: #a0a0b0;
    background: rgba(160, 160, 176, 0.12);
    border-color: rgba(160, 160, 176, 0.25);
}
[data-theme="dark"] .eg-source {
    color: #c0a878;
    background: rgba(192, 168, 120, 0.12);
}
[data-theme="dark"] .eg-empty {
    color: #8a8a9a;
}
[data-theme="dark"] .modal-desc {
    color: #9a9aaa;
}
[data-theme="dark"] .settings-hint-text {
    color: #9a9aaa;
}
[data-theme="dark"] .word-badge {
    color: #fff;
    background: linear-gradient(135deg, #8a7a5a, #6a5a3a);
}

/* ========================================
   间隔复习页（SRS + 生成式练习 + 错因诊断）
   ======================================== */
.review-page {
    max-width: 720px;
    margin: 0 auto;
    padding: 32px 20px 64px;
}
.review-header { text-align: center; margin-bottom: 28px; }
.review-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 8px;
}
.review-subtitle {
    margin: 0;
    color: var(--color-text-light);
    font-size: 15px;
}

.review-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 18px 12px;
    margin-bottom: 24px;
    box-shadow: var(--shadow);
}
.review-stat { flex: 1; text-align: center; }
.review-stat-num {
    display: block;
    font-size: 26px;
    font-weight: 700;
    color: var(--color-gold-text);
    line-height: 1.2;
}
.review-stat-label {
    font-size: 13px;
    color: var(--color-text-light);
}
.review-stat-divider {
    width: 1px;
    height: 32px;
    background: var(--color-border);
}

.review-filters {
    display: flex;
    flex-direction: column;
    gap: 14px;
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 18px 16px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}
.review-filter-group {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.review-filter-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-secondary);
    min-width: 32px;
}
.review-scope {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* 收藏按钮"已加入"高亮态（查询页/练习页的「加入复习」按钮通用） */
.bank-toggle-btn.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.review-start-btn {
    display: block;
    width: 100%;
    max-width: 320px;
    margin: 0 auto 28px;
    padding: 14px 20px;
    font-size: 16px;
}

.review-progress {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    font-size: 13px;
    color: var(--color-text-light);
}
.review-progress-track {
    flex: 1;
    height: 6px;
    background: var(--color-border);
    border-radius: 999px;
    overflow: hidden;
}
.review-progress-fill {
    height: 100%;
    width: 0;
    background: var(--color-primary);
    border-radius: 999px;
    transition: width 0.3s ease;
}

.review-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow);
    text-align: center;
}
.review-card-tag {
    display: inline-block;
    font-size: 12px;
    color: var(--color-gold-text);
    background: var(--color-gold-light);
    border-radius: 999px;
    padding: 4px 12px;
    margin-bottom: 18px;
}
.review-source {
    color: var(--color-text-light);
    font-size: 14px;
    margin-bottom: 10px;
}
.review-hint {
    display: inline-block;
    color: var(--color-text-secondary);
    font-size: 15px;
    background: var(--color-gold-light);
    border: 1px solid var(--color-brand-gold);
    border-radius: 8px;
    padding: 8px 14px;
    margin-bottom: 16px;
    max-width: 100%;
}
.review-sentence {
    font-size: 22px;
    line-height: 2;
    color: var(--color-text);
    margin-bottom: 22px;
    letter-spacing: 1px;
}
.cloze-input {
    width: 1.6em;
    padding: 2px 0;
    margin: 0 2px;
    text-align: center;
    font-size: 22px;
    font-family: inherit;
    color: var(--color-primary);
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--color-primary);
    outline: none;
}
.cloze-input:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 4px;
}
.cloze-reveal { font-weight: 700; padding: 0 2px; }
.cloze-reveal.correct { color: #16a34a; }
.cloze-reveal.incorrect { color: #dc2626; text-decoration: underline; }

.review-recall-char {
    font-size: 64px;
    font-weight: 700;
    color: var(--color-gold-text);
    line-height: 1.1;
    margin-bottom: 6px;
}
.review-recall-pinyin { color: var(--color-text-light); margin-bottom: 18px; }
.review-recall-input {
    width: 100%;
    font-family: inherit;
    font-size: 16px;
    color: var(--color-text);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 12px;
    resize: vertical;
    outline: none;
}
.review-recall-input:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.review-actions { margin: 8px 0 4px; }
.review-result {
    margin-top: 18px;
    padding: 14px;
    background: var(--color-surface-alt);
    border-radius: var(--radius);
    color: var(--color-text);
    font-size: 15px;
    text-align: left;
}
.review-answer { font-weight: 700; color: var(--color-gold-text); }
.review-meta-result { display: block; margin-top: 8px; color: var(--color-text-light); font-size: 14px; }
.review-meta-result .meta-label { color: var(--color-gold-text); font-weight: 600; }
.review-answer-list { margin-top: 6px; color: var(--color-text-secondary); font-size: 14px; }

.review-grade {
    margin-top: 16px;
    text-align: center;
}
.review-grade-label { display: block; color: var(--color-text-light); margin-bottom: 10px; font-size: 14px; }
.review-grade-btns { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.review-grade-btn {
    min-width: 88px;
    padding: 10px 16px;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    color: var(--color-text);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}
.review-grade-btn:hover { border-color: var(--color-primary); color: var(--color-primary); transform: translateY(-1px); }
.review-grade-btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

.review-summary {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow);
    text-align: center;
}
.review-summary-title { font-size: 20px; color: var(--color-text); margin: 0 0 18px; }
.review-summary-counts { display: flex; justify-content: center; gap: 28px; margin-bottom: 22px; }
.summary-stat { text-align: center; }
.summary-num { display: block; font-size: 28px; font-weight: 700; color: var(--color-gold-text); }
.summary-label { font-size: 13px; color: var(--color-text-light); }

.review-weak { text-align: left; margin-bottom: 22px; }
.weak-title { font-size: 14px; color: var(--color-text-light); margin-bottom: 10px; }
.weak-list { display: flex; flex-direction: column; gap: 8px; }
.weak-item {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 14px;
    background: var(--color-surface-alt);
    border-radius: var(--radius);
    font-size: 14px;
}
.weak-name { color: var(--color-text); font-weight: 600; }
.weak-rate { color: #dc2626; font-size: 13px; }
.weak-empty { color: var(--color-text-light); font-size: 14px; padding: 8px 0; }

.review-summary-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

@media (max-width: 640px) {
    .review-sentence { font-size: 19px; }
    .review-summary-counts { gap: 16px; }
}

@media (prefers-reduced-motion: reduce) {
    .review-progress-fill, .review-grade-btn { transition: none; }
}

/* ========================================
   导航重构：下拉菜单 + 学习仪表盘
   ======================================== */

/* --- 桌面端下拉菜单 --- */
.nav-dropdown {
    position: relative;
    display: flex;
    align-items: center;
}

.nav-dropdown > .nav-link {
    display: flex;
    align-items: center;
}

.nav-caret {
    font-size: 10px;
    opacity: 0.7;
    margin-left: 4px;
    display: inline-flex;
    align-items: center;
    line-height: 1;
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 140px;
    background: var(--color-white);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    padding: 6px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
    z-index: 100;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-item {
    display: block;
    padding: 10px 18px;
    color: var(--color-text);
    text-decoration: none;
    font-size: 14px;
    transition: background 0.15s;
    cursor: pointer;
}

.nav-dropdown-item:hover {
    background: var(--color-active-bg);
    color: var(--color-primary);
}

/* --- 移动端导航分组 --- */
.mobile-nav-group {
    padding: 0;
    margin: 0;
}

.mobile-nav-group-title {
    padding: 12px 24px 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mobile-nav-sub {
    padding-left: 36px !important;
    font-size: 14px;
}

/* --- 首页学习进度卡片 --- */
.home-progress {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.home-progress-card {
    flex: 1;
    background: var(--color-white);
    border-radius: 12px;
    padding: 20px 16px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
    border: 1px solid var(--color-border);
}

.home-progress-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.home-progress-num {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.home-progress-label {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 4px;
}

/* --- [v5修复] 六步翻译法历史评分徽章暗色适配 --- */
[data-theme="dark"] .step-history-header .history-eval-badge.partial {
    background: var(--color-warning-bg);
    color: var(--color-warning-text);
}
[data-theme="dark"] .step-history-header .history-eval-badge.incorrect {
    background: var(--color-error-bg);
    color: var(--color-error-text);
}
[data-theme="dark"] .step-history-header .history-eval-badge.skipped {
    background: var(--color-disabled-bg);
    color: var(--color-text-tertiary);
}
[data-theme="dark"] .step-history-body {
    border-top-color: var(--color-border);
}
[data-theme="dark"] .step-history-section {
    color: var(--color-text-secondary);
}

/* --- [v5修复] 翻译评分步骤 skipped/early-finish 暗色适配 --- */
[data-theme="dark"] .score-step-item.skipped {
    background: var(--color-disabled-bg);
    color: var(--color-text-tertiary);
}
[data-theme="dark"] .score-step-item.early-finish {
    background: #2a2820;
    color: #d4c4a8;
}

/* --- [v5修复] 练习模块题卡暗色适配 --- */
[data-theme="dark"] .practice-option {
    background: var(--color-surface-secondary);
    border-color: var(--color-border);
    color: var(--color-text-primary);
}
[data-theme="dark"] .practice-option:hover {
    background: var(--color-hover-overlay);
    border-color: var(--color-text-tertiary);
}
[data-theme="dark"] .practice-option.correct {
    background: var(--color-success-bg);
    border-color: var(--color-success-border);
    color: var(--color-success-text);
}
[data-theme="dark"] .practice-option.wrong {
    background: var(--color-error-bg);
    border-color: var(--color-error-border);
    color: var(--color-error-text);
}

/* --- [v5修复] 间隔复习卡片暗色适配 --- */
[data-theme="dark"] .review-card {
    background: var(--color-surface-primary);
    border-color: var(--color-border);
}
[data-theme="dark"] .review-grade-btn {
    background: var(--color-surface-tertiary);
    border-color: var(--color-border);
    color: var(--color-text-primary);
}
[data-theme="dark"] .review-grade-btn:hover {
    background: var(--color-surface-elevated);
}

@media (max-width: 768px) {
    .home-progress {
        gap: 8px;
    }
    .home-progress-card {
        padding: 14px 8px;
    }
    .home-progress-num {
        font-size: 22px;
    }
    .home-progress-label {
        font-size: 12px;
    }
}

/* ==================== 反馈浮动按钮与弹窗 ==================== */

/* 浮动按钮 */
.feedback-fab {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9000;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border: none;
    border-radius: 28px;
    background: var(--color-primary);
    color: #fff;
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(74, 111, 165, 0.4);
    transition: transform 0.25s ease, box-shadow 0.25s ease, opacity 0.25s ease;
    opacity: 0.92;
}
.feedback-fab:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 111, 165, 0.5);
    opacity: 1;
}
.feedback-fab:active {
    transform: translateY(0);
}
.feedback-fab-text {
    font-weight: 500;
    letter-spacing: 1px;
}

/* 遮罩 */
.feedback-overlay {
    position: fixed;
    inset: 0;
    z-index: 9100;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}
.feedback-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

/* 弹窗主体 */
.feedback-modal {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) translateY(100%);
    z-index: 9200;
    width: 100%;
    max-width: 480px;
    max-height: 85vh;
    overflow-y: auto;
    background: var(--color-surface-primary, #fff);
    border-radius: 20px 20px 0 0;
    box-shadow: 0 -4px 30px rgba(0, 0, 0, 0.12);
    transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.feedback-modal.show {
    transform: translateX(-50%) translateY(0);
}

/* 弹窗头部 */
.feedback-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px 12px;
    border-bottom: 1px solid var(--color-border, #e8e4dd);
}
.feedback-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary, #1a1a2a);
}
.feedback-close {
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    font-size: 24px;
    line-height: 1;
    color: var(--color-text-tertiary, #999);
    cursor: pointer;
    border-radius: 50%;
    transition: background 0.2s, color 0.2s;
}
.feedback-close:hover {
    background: var(--color-surface-tertiary, #f0ede7);
    color: var(--color-text-primary, #333);
}

/* 弹窗内容 */
.feedback-modal-body {
    padding: 16px 24px;
}
.feedback-hint {
    font-size: 14px;
    color: var(--color-text-secondary, #666);
    margin-bottom: 16px;
}

/* 选项 */
.feedback-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}
.feedback-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border: 1.5px solid var(--color-border, #e8e4dd);
    border-radius: 10px;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    user-select: none;
}
.feedback-option:hover {
    border-color: var(--color-primary, #4a6fa5);
    background: var(--color-surface-tertiary, #f8f6f2);
}
.feedback-option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary, #4a6fa5);
    cursor: pointer;
    flex-shrink: 0;
}
.feedback-option input[type="checkbox"]:checked + span {
    color: var(--color-primary, #4a6fa5);
    font-weight: 500;
}
.feedback-option span {
    font-size: 14px;
    color: var(--color-text-primary, #333);
    transition: color 0.2s, font-weight 0.2s;
}

/* 文本框 */
.feedback-textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid var(--color-border, #e8e4dd);
    border-radius: 10px;
    font-size: 14px;
    font-family: inherit;
    color: var(--color-text-primary, #333);
    background: var(--color-surface-secondary, #faf8f5);
    resize: vertical;
    min-height: 80px;
    transition: border-color 0.2s;
    box-sizing: border-box;
}
.feedback-textarea:focus {
    outline: none;
    border-color: var(--color-primary, #4a6fa5);
}
.feedback-textarea::placeholder {
    color: var(--color-text-tertiary, #aaa);
}
.feedback-counter {
    text-align: right;
    font-size: 12px;
    color: var(--color-text-tertiary, #999);
    margin-top: 4px;
}

/* 底部按钮 */
.feedback-modal-footer {
    display: flex;
    gap: 12px;
    padding: 16px 24px 24px;
}
.feedback-btn-primary {
    flex: 1;
    padding: 12px 20px;
    border: none;
    border-radius: 10px;
    background: var(--color-primary, #4a6fa5);
    color: #fff;
    font-size: 15px;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}
.feedback-btn-primary:hover {
    background: var(--color-primary-dark, #3a5a8a);
}
.feedback-btn-primary:active {
    transform: scale(0.98);
}
.feedback-btn-secondary {
    flex: 1;
    padding: 12px 20px;
    border: 1.5px solid var(--color-border, #e8e4dd);
    border-radius: 10px;
    background: transparent;
    color: var(--color-text-secondary, #666);
    font-size: 15px;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
}
.feedback-btn-secondary:hover {
    background: var(--color-surface-tertiary, #f0ede7);
    border-color: var(--color-text-tertiary, #ccc);
}

/* 成功弹窗 */
.feedback-success {
    position: fixed;
    bottom: 50%;
    left: 50%;
    transform: translate(-50%, 50%);
    z-index: 9300;
    width: calc(100% - 48px);
    max-width: 360px;
    padding: 32px 24px;
    background: var(--color-surface-primary, #fff);
    border-radius: 20px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.15);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}
.feedback-success-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--color-step-done, #3d8b6e);
    color: #fff;
    font-size: 28px;
    line-height: 56px;
    margin-bottom: 8px;
}
.feedback-success-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary, #1a1a2a);
}
.feedback-success-desc {
    font-size: 14px;
    color: var(--color-text-secondary, #666);
    margin-bottom: 16px;
}
.feedback-success .feedback-btn-primary,
.feedback-success .feedback-btn-secondary {
    width: 100%;
    flex: none;
}
.feedback-success .feedback-btn-primary {
    margin-bottom: 8px;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .feedback-fab {
        bottom: 16px;
        right: 16px;
        padding: 10px 16px;
    }
    .feedback-fab-text {
        display: none;
    }
    .feedback-fab svg {
        width: 20px;
        height: 20px;
    }
    .feedback-modal {
        max-width: 100%;
    }
}

/* 暗色模式适配 */
[data-theme="dark"] .feedback-fab {
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
}
[data-theme="dark"] .feedback-modal {
    box-shadow: 0 -4px 30px rgba(0, 0, 0, 0.3);
}
[data-theme="dark"] .feedback-close:hover {
    background: var(--color-surface-tertiary);
}
[data-theme="dark"] .feedback-option:hover {
    background: var(--color-surface-tertiary);
}
[data-theme="dark"] .feedback-textarea {
    background: var(--color-surface-secondary);
}
[data-theme="dark"] .feedback-success {
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
}

/* ══════════════════════════════════════════════════════════
   移动端底部 Tab 栏（C1 决策，2026-07-21）
   主任务一步直达；仅 ≤768px 显示；与汉堡抽屉并存（抽屉收纳低频项）
   ══════════════════════════════════════════════════════════ */
.mobile-tab-bar {
    display: none; /* 桌面端隐藏，移动端在媒体查询中显示 */
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 300;
    background: var(--color-surface-primary);
    border-top: 1px solid var(--color-border);
    padding-bottom: env(safe-area-inset-bottom, 0); /* iPhone 底部安全区 */
    box-shadow: 0 -2px 12px rgba(26, 26, 42, 0.06);
}

.mobile-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    min-height: 52px; /* ≥44px 触控目标 */
    padding: 6px 2px;
    text-decoration: none;
    color: var(--color-text-secondary);
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-main);
    transition: color var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.mobile-tab:active {
    background: var(--color-hover-overlay);
}

.mobile-tab.active {
    color: var(--color-brand-indigo);
    font-weight: 600;
}

.mobile-tab-icon {
    font-size: 20px;
    line-height: 1;
}

.mobile-tab-label {
    font-size: 11px;
    line-height: 1.2;
}

/* "学习"二级菜单（底部弹出） */
.mobile-study-menu {
    display: none;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 320;
    background: var(--color-surface-elevated);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    box-shadow: 0 -8px 32px rgba(26, 26, 42, 0.16);
    padding: 8px 0 calc(8px + env(safe-area-inset-bottom, 0));
    transform: translateY(100%);
    transition: transform var(--transition-normal);
}

.mobile-study-menu.open {
    transform: translateY(0);
}

.mobile-study-item {
    display: block;
    padding: 14px 24px;
    text-decoration: none;
    color: var(--color-text-primary);
    font-size: 16px;
    transition: background var(--transition-fast);
}

.mobile-study-item:active {
    background: var(--color-surface-tertiary);
}

.mobile-study-scrim {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 310;
    background: var(--color-overlay);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.mobile-study-scrim.open {
    opacity: 1;
}

/* 移动端启用底部 Tab：隐藏汉堡按钮、为主内容留底部空间 */
@media (max-width: 768px) {
    .mobile-tab-bar {
        display: flex;
    }
    .mobile-study-menu,
    .mobile-study-scrim {
        display: block;
    }
    .mobile-study-menu {
        visibility: hidden;
    }
    .mobile-study-menu.open {
        visibility: visible;
    }
    .mobile-study-scrim {
        visibility: hidden;
        pointer-events: none;
    }
    .mobile-study-scrim.open {
        visibility: visible;
        pointer-events: auto;
    }
    /* 底部 Tab 接管主导航 → 隐藏右上角汉堡按钮（抽屉保留但入口改到"学习"二级/低频） */
    .hamburger-btn {
        display: none !important;
    }
    /* P2-U6: 汉堡入口已隐藏，抽屉无触发入口 → 移动端彻底隐藏避免死代码占空间 */
    #mobile-nav {
        display: none;
    }
    /* 主内容底部留白，避免被 fixed Tab 遮挡 */
    .main {
        padding-bottom: calc(72px + env(safe-area-inset-bottom, 0));
    }
    .footer {
        margin-bottom: calc(72px + env(safe-area-inset-bottom, 0));
    }
    /* 反馈悬浮按钮上移，避免与底部 Tab 重叠 */
    .feedback-fab {
        bottom: calc(84px + env(safe-area-inset-bottom, 0));
    }
}

/* 暗色模式适配 */
[data-theme="dark"] .mobile-tab-bar {
    background: var(--color-surface-primary);
    border-top-color: var(--color-border);
    box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.4);
}
[data-theme="dark"] .mobile-study-menu {
    background: var(--color-surface-elevated);
}