@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');
/* font-display: swap applied via display=swap parameter above */

/* ===== 基础变量 ===== */
:root {
    /* Pastel editorial palette — inspired by Mr. Marcel School */
    --bg-primary: #faf9f6;
    --bg-secondary: #f5f3ef;
    --bg-card: #ffffff;
    --bg-card-hover: #f8f7f4;
    --text-primary: #1a1a1a;
    --text-secondary: #555555;
    --text-muted: #999999;
    --accent-blue: #1a1a1a;
    --accent-purple: #1a1a1a;
    --accent-cyan: #555555;
    --accent-green: #1a1a1a;
    --gradient: linear-gradient(135deg, #1a1a1a, #333333);
    --border-color: #1a1a1a;
    --border-color-hover: #000000;
    --glow-blue: transparent;
    --glow-purple: transparent;

    /* Pastel block colors */
    --pastel-pink: #f5cac3;
    --pastel-green: #d5e8d0;
    --pastel-yellow: #fef3d0;
    --pastel-blue: #d5dff5;
    --pastel-peach: #f2ddd5;
    --pastel-mint: #d0f0e0;

    /* Semantic colors — difficulty / status */
    --color-easy: #22c55e;
    --color-medium: #f59e0b;
    --color-hard: #ef4444;
    --color-info: #3b82f6;
    --color-success: #10b981;

    /* Radius — flatter, more editorial */
    --radius: 0px;
    --radius-sm: 0px;
    --radius-xs: 0px;

    /* Type scale — clear hierarchy */
    --text-xs: 0.75rem;
    --text-sm: 0.85rem;
    --text-base: 0.95rem;
    --text-lg: 1.1rem;
    --text-xl: 1.35rem;
    --text-2xl: 2rem;
    --text-3xl: 3.2rem;

    /* Spacing scale (4px base) */
    --sp-1: 4px;
    --sp-2: 8px;
    --sp-3: 12px;
    --sp-4: 16px;
    --sp-5: 24px;
    --sp-6: 32px;
    --sp-8: 48px;
    --sp-10: 64px;
    --sp-section: 80px;
}

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

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: var(--text-base);
    line-height: 1.7;
    letter-spacing: 0.02em;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== 统一卡片基础 ===== */
.card-base {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 24px;
    transition: transform 0.2s ease, border-color 0.2s, box-shadow 0.2s;
}
.card-base:hover {
    transform: translateY(-2px);
    border-color: var(--border-color-hover);
    box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}
[data-theme="dark"] .card-base:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent-cyan);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
}

/* ===== 页面入场动画 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes breathe {
    0%, 100% {
        transform: translateX(-50%) scale(1);
        opacity: 0.6;
    }
    50% {
        transform: translateX(-50%) scale(1.08);
        opacity: 1;
    }
}

@keyframes shimmer {
    0% { background-position: -200% center; }
    100% { background-position: 200% center; }
}

.animate-in {
    animation: fadeInUp 0.5s ease-out both;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(250, 249, 246, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid #e8e5e0;
    padding: 14px 0;
    transition: padding 0.3s, background 0.3s;
}

.navbar.scrolled {
    padding: 10px 0;
    background: rgba(250, 249, 246, 0.98);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary) !important;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.02em;
}

.logo-icon {
    font-size: 1.6rem;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 4px;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: color 0.2s, background 0.2s;
    padding: 7px 14px;
    border-radius: 0;
    position: relative;
    white-space: nowrap;
}

.nav-links a:hover {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.04);
}

.nav-links a.active {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.06);
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* Right-side actions group */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* Nav dropdown — "我的" */
.nav-dropdown {
    position: relative;
}

.nav-user-btn {
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-primary);
    background: transparent;
    border: 1.5px solid var(--text-primary);
    padding: 6px 14px;
    border-radius: 9999px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    line-height: 1.4;
}

.nav-user-btn:hover {
    color: #fff;
    border-color: var(--text-primary);
    background: var(--text-primary);
}

.nav-user-btn.active {
    color: var(--text-primary);
    border-color: var(--text-primary);
    background: transparent;
}

.nav-arrow {
    font-size: 0.7em;
    opacity: 0.6;
    margin-left: 2px;
}

.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background: var(--bg-card);
    border: 1.5px solid var(--text-primary);
    border-radius: 0;
    padding: var(--sp-1) 0;
    min-width: 120px;
    box-shadow: none;
    z-index: 100;
}

.nav-dropdown-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 0;
    right: 0;
    height: 8px;
}

.nav-dropdown:hover .nav-dropdown-menu {
    display: block;
}

.nav-dropdown-menu a {
    display: block;
    padding: 8px 16px;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    white-space: nowrap;
    transition: all 0.15s;
}

.nav-dropdown-menu a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

[data-theme="light"] .nav-links a:hover {
    background: rgba(58, 54, 50, 0.05);
}

[data-theme="light"] .nav-links a.active {
    background: rgba(126, 146, 168, 0.12);
    color: var(--accent-blue);
}

[data-theme="light"] .nav-dropdown-menu {
    background: var(--bg-card);
    box-shadow: 0 8px 24px rgba(58, 54, 50, 0.08);
}

[data-theme="light"] .nav-dropdown-menu a:hover {
    background: rgba(58, 54, 50, 0.05);
}

[data-theme="light"] .nav-user-btn {
    background: rgba(58, 54, 50, 0.04);
    border-color: var(--border-color);
}

[data-theme="light"] .nav-user-btn:hover {
    background: rgba(58, 54, 50, 0.07);
}

[data-theme="light"] .nav-user-btn.active {
    color: var(--accent-blue);
    border-color: rgba(126, 146, 168, 0.3);
    background: rgba(126, 146, 168, 0.1);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    padding: 160px 0 60px;
    text-align: center;
    overflow: hidden;
    background: var(--pastel-pink);
}

.hero-bg-effect {
    display: none;
}

/* 侧边装饰光晕 */
.hero::before,
.hero::after {
    display: none;
}

.hero-content {
    position: relative;
    animation: fadeInUp 0.7s ease-out;
}

.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    background: transparent;
    border: 1.5px solid var(--text-primary);
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 28px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero h1 {
    font-size: var(--text-3xl);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: var(--sp-5);
    letter-spacing: -0.03em;
}

.gradient-text {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-thickness: 3px;
    text-underline-offset: 4px;
}

.hero-desc {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 580px;
    margin: 0 auto var(--sp-8);
    line-height: 1.9;
    background: transparent;
    padding: 12px 24px;
    border-radius: 0;
    border: none;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 40px;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 9999px;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.25s ease;
    cursor: pointer;
    border: 1.5px solid var(--text-primary);
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--text-primary);
    color: #ffffff;
}

.btn-primary:hover {
    opacity: 0.85;
    color: #ffffff;
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--text-primary);
}

.btn-secondary:hover {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #ffffff;
}

/* ===== 统计 + 每日一句 并排 ===== */
.hero-duo-section {
    padding: 0;
    position: relative;
}

.hero-duo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    align-items: stretch;
}

.hero-stats-card {
    background: transparent;
    border: none;
    border-radius: 0;
    padding: 60px 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.stats-card-title {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 24px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 4px;
    letter-spacing: 0.02em;
}

.daily-quote {
    text-align: center;
    padding: 60px 32px;
    background: transparent;
    border: none;
    border-left: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 0;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.quote-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 16px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.quote-en {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.7;
    color: var(--text-primary);
    margin: 0 0 12px;
    font-style: italic;
    border: none;
    padding: 0;
}

.quote-zh {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.6;
}

.quote-author {
    font-size: 0.82rem;
    color: var(--accent-blue);
    font-weight: 500;
}

/* ===== 通用 Section ===== */
.section {
    padding: 80px 0;
    position: relative;
}

/* Full-width section color blocks — Mr. Marcel style */
.section-yellow {
    background: var(--pastel-yellow);
}

.section-blue {
    background: var(--pastel-blue);
}

.section-green {
    background: var(--pastel-green);
}

.section-pink {
    background: var(--pastel-pink);
}

.section-peach {
    background: var(--pastel-peach);
}

.section-mint {
    background: var(--pastel-mint);
}

.section-dark {
    background: #1a1a1a;
    color: #eee1d3;
}

.section-dark .section-title {
    color: #eee1d3;
}

.section-dark .section-subtitle {
    color: #c5b9ad;
}

.section-purple {
    background: #3c3466;
    color: #f7c8b9;
}

.section-purple .section-title {
    color: #f7c8b9;
}

.section-purple .section-subtitle {
    color: #c9b3a8;
}

.section-title {
    font-size: var(--text-2xl);
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--sp-3);
    letter-spacing: -0.02em;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 48px;
    font-size: 0.95rem;
}

/* ===== 卡片网格 ===== */
.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.card {
    background: var(--pastel-yellow);
    border: none;
    border-radius: 0;
    padding: 28px;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.5s ease-out both;
}

.card::before {
    display: none;
}

.card:hover {
    background: var(--pastel-yellow);
    transform: translateY(-2px);
    border-color: transparent;
}

.card:hover::before {
    opacity: 0;
}

/* 特色卡片：多章节长文 */
.card.card-featured {
    padding: 32px;
    border-color: transparent;
    background: var(--pastel-blue);
}

.card.card-featured::before {
    display: none;
}

.card-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: 0.78rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.02em;
}

.tag-twitter {
    background: #1DA1F2;
    color: #fff;
}

.tag-blog {
    background: #10b981;
    color: #fff;
}

.tag-video {
    background: #FF0000;
    color: #fff;
}

.card-source {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.avatar {
    width: 42px;
    height: 42px;
    border-radius: 0;
    background: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    color: white;
    flex-shrink: 0;
    box-shadow: none;
}

.card-source strong {
    display: block;
    font-size: 0.95rem;
}

.handle {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.card-text-en {
    font-size: 0.92rem;
    line-height: 1.85;
    color: var(--text-primary);
    margin-bottom: 12px;
    font-style: italic;
    opacity: 0.9;
}

.card-text-zh {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.75;
    padding-left: 14px;
    border-left: 2px solid var(--accent-purple);
    margin-bottom: 18px;
}

.vocab {
    color: #2a8a8a;
    border-bottom: 1px dashed #2a8a8a;
    cursor: help;
    position: relative;
    transition: border-color 0.2s;
}

.vocab:hover {
    border-bottom-color: #1a6a6a;
}

.vocab-tip {
    position: absolute;
    background: var(--bg-card);
    color: #2a8a8a;
    padding: 8px 16px;
    border-radius: 0;
    font-size: 0.82rem;
    white-space: nowrap;
    z-index: 100;
    pointer-events: none;
    border: 1px solid #2a8a8a;
    box-shadow: none;
    font-style: normal;
    font-weight: 500;
    max-width: 300px;
    white-space: normal;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
}

.difficulty {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.card-link {
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s;
    padding: 4px 0;
}

.card-link:hover {
    letter-spacing: 0.03em;
}

.parts-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 0;
    margin-left: 8px;
    letter-spacing: 0.02em;
}

/* ===== 学习步骤 ===== */
.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.step {
    text-align: center;
    padding: 40px 28px;
    background: var(--pastel-mint);
    border: none;
    border-radius: 0;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.step::after {
    display: none;
}

.step:hover {
    transform: translateY(-2px);
    border-color: transparent;
    box-shadow: none;
}

.step:hover::after {
    transform: scaleX(0);
}

.step-icon {
    width: 40px;
    height: 40px;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.06);
}

.step-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.step h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.step p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* ===== 内容来源标签 ===== */
.sources {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
    max-width: 900px;
    margin: 0 auto;
}

.source-item {
    padding: 12px 28px;
    background: transparent;
    border: 1.5px solid var(--text-primary);
    border-radius: 9999px;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
    cursor: default;
    position: relative;
    overflow: hidden;
}

.source-item::before {
    display: none;
}

.source-item:hover {
    border-color: var(--text-primary);
    color: #fff;
    background: var(--text-primary);
    transform: translateY(-1px);
    box-shadow: none;
}

.source-item:hover::before {
    opacity: 0;
}

/* ===== 页脚 ===== */
.footer {
    background: var(--pastel-peach);
    border-top: none;
    padding: 48px 0 24px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 32px;
}

.footer-brand {
    font-size: 1.2rem;
    font-weight: 700;
}

.footer-brand p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 8px;
    font-weight: 400;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== 每日学习页面 ===== */
.page-header {
    padding: 120px 0 40px;
    text-align: center;
    background: var(--pastel-blue);
}

.page-header.page-header-green {
    background: var(--pastel-green);
}

.page-header.page-header-yellow {
    background: var(--pastel-yellow);
}

.page-header.page-header-pink {
    background: var(--pastel-pink);
}

.page-header.page-header-peach {
    background: var(--pastel-peach);
}

.page-header.page-header-mint {
    background: var(--pastel-mint);
}

.page-header h1 {
    font-size: var(--text-2xl);
    font-weight: 800;
    margin-bottom: var(--sp-2);
    letter-spacing: -0.02em;
}

.page-header p {
    color: var(--text-muted);
}

.lesson-card {
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    padding: 40px;
    margin-bottom: 28px;
    transition: transform 0.2s ease, border-color 0.2s, box-shadow 0.2s;
    animation: fadeInUp 0.5s ease-out both;
}

.lesson-card:hover {
    border-color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

/* === 推文卡片 — 左侧蓝色竖条 === */
.lesson-card[data-type="twitter"] {
    border-left: 4px solid #1DA1F2;
}

/* === 视频卡片 — 影院风格 === */
.lesson-card[data-type="video"] {
    padding: 0;
    overflow: hidden;
}

.lesson-card[data-type="video"] .video-hero {
    background: #0a0a0a;
    margin: 0;
}

.lesson-card[data-type="video"] .video-hero .video-embed {
    margin-bottom: 0;
    border-radius: 0;
}

.lesson-card[data-type="video"] .lesson-header {
    padding: 28px 40px 0;
    margin-bottom: 20px;
}

.lesson-card[data-type="video"] .video-card-body {
    padding: 0 40px 40px;
}

/* === 长推文展开/收起 === */
.tweet-content-wrap {
    position: relative;
}

.tweet-content-wrap.collapsed {
    max-height: 600px;
    overflow: hidden;
}

.tweet-content-wrap.collapsed::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(transparent, var(--bg-card));
    pointer-events: none;
}

.tweet-expand-btn {
    display: block;
    margin: 16px auto 0;
    padding: 10px 32px;
    background: var(--text-primary);
    color: var(--bg-card);
    border: none;
    border-radius: 24px;
    font-size: var(--text-sm);
    cursor: pointer;
    transition: opacity 0.2s;
}

.tweet-expand-btn:hover {
    opacity: 0.85;
}

.lesson-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
    flex-wrap: wrap;
    gap: 12px;
}

.lesson-meta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.lesson-content-en {
    font-size: var(--text-lg);
    line-height: 2.1;
    margin-bottom: var(--sp-5);
    padding: var(--sp-5) var(--sp-6);
    background: var(--pastel-yellow);
    border-radius: 0;
    border-left: 3px solid var(--text-primary);
    letter-spacing: 0.01em;
    font-family: "Inter", -apple-system, sans-serif;
}

.lesson-content-en p {
    margin-bottom: 16px;
}

.lesson-content-en p:last-child {
    margin-bottom: 0;
}

.lesson-content-zh {
    font-size: var(--text-base);
    line-height: 1.9;
    color: var(--text-secondary);
    margin-bottom: var(--sp-6);
    padding: var(--sp-5) var(--sp-6);
    background: var(--pastel-peach);
    border-radius: 0;
    border-left: 3px solid var(--text-muted);
    letter-spacing: 0.04em;
}

.vocab-section {
    margin-top: 32px;
    padding-top: 28px;
    border-top: 1px solid var(--border-color);
}

.vocab-section h3 {
    font-size: 1.05rem;
    margin-bottom: 16px;
    color: #2a8a8a;
    font-weight: 600;
}

.vocab-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 12px;
}

.vocab-item:hover {
    background: rgba(42, 138, 138, 0.1);
    border-color: rgba(42, 138, 138, 0.25);
}

.vocab-word {
    font-weight: 700;
    color: #2a8a8a;
    font-size: 0.95rem;
    white-space: nowrap;
}

.vocab-def {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
    flex: 1;
    min-width: 0;
}

/* 词汇项：主行 + 例句 */
.vocab-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 14px 18px;
    background: rgba(42, 138, 138, 0.06);
    border-radius: 0;
    border: 1px solid rgba(42, 138, 138, 0.12);
    transition: all 0.2s;
}

.vocab-main {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 8px 12px;
}

.vocab-main .vocab-word {
    min-width: 100px;
}

.vocab-main .vocab-def {
    flex: 1 1 180px;
}

.vocab-actions {
    display: flex;
    gap: 6px;
    margin-left: auto;
}

.vocab-example {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.6;
    padding-left: 42px;
    font-style: italic;
}

.vocab-example-zh {
    font-style: normal;
    color: var(--text-muted);
    opacity: 0.75;
    font-size: 0.8rem;
}

/* 语法解析 */
.grammar-section {
    margin-top: 32px;
    padding-top: 28px;
    border-top: 1px solid var(--border-color);
}

.grammar-section h3 {
    font-size: 1.05rem;
    margin-bottom: 16px;
    color: var(--accent-purple);
    font-weight: 600;
}

.grammar-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.grammar-item {
    padding: 18px 22px;
    background: rgba(139, 92, 246, 0.04);
    border: 1px solid rgba(139, 92, 246, 0.1);
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.grammar-item:hover {
    background: rgba(139, 92, 246, 0.07);
    border-color: rgba(139, 92, 246, 0.2);
}

.grammar-pattern {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--accent-purple);
    margin-bottom: 8px;
}

.grammar-example {
    font-size: 0.88rem;
    color: var(--text-primary);
    font-style: italic;
    line-height: 1.7;
    margin-bottom: 8px;
    opacity: 0.85;
}

.grammar-example-zh {
    font-size: 0.84rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 8px;
    padding-left: 12px;
    border-left: 2px solid rgba(139, 92, 246, 0.2);
}

.grammar-explanation {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 视频嵌入 */
.video-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--radius);
    margin-bottom: 24px;
}

.video-embed iframe,
.video-embed video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    object-fit: contain;
    background: #000;
}

.video-fallback-link {
    position: absolute;
    bottom: 16px;
    right: 16px;
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: var(--text-sm);
    text-decoration: none;
    z-index: 10;
    transition: background 0.2s;
}

.video-fallback-link:hover {
    background: rgba(255, 0, 0, 0.85);
    color: #fff;
}

/* ===== 横向时间轴 ===== */
.timeline-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 24px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}

.timeline-arrow {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1.5px solid var(--text-primary);
    border-radius: 0;
    color: var(--text-primary);
    font-size: 1.3rem;
    cursor: pointer;
    transition: all 0.2s;
    z-index: 2;
}

.timeline-arrow:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.timeline-track {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    padding: 8px 4px;
    flex: 1;
    mask-image: linear-gradient(to right, transparent, black 32px, black calc(100% - 32px), transparent);
    -webkit-mask-image: linear-gradient(to right, transparent, black 32px, black calc(100% - 32px), transparent);
}

.timeline-track::-webkit-scrollbar {
    display: none;
}

.tl-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 52px;
    padding: 8px 6px 10px;
    background: none;
    border: 1px solid transparent;
    border-radius: 0;
    cursor: default;
    color: var(--text-muted);
    font-size: 0.75rem;
    transition: all 0.2s;
    scroll-snap-align: center;
    position: relative;
    opacity: 0.4;
}

.tl-item:disabled {
    cursor: default;
}

.tl-month {
    font-size: 0.62rem;
    font-weight: 700;
    color: var(--accent-purple);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 2px;
    opacity: 1;
}

.tl-day {
    font-size: 1.2rem;
    font-weight: 800;
    line-height: 1.2;
    color: inherit;
}

.tl-wd {
    font-size: 0.62rem;
    font-weight: 500;
    color: inherit;
    margin-top: 1px;
}

.tl-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--accent-blue);
    margin-top: 4px;
}

/* 有内容的日期 */
.tl-has-content {
    opacity: 1;
    color: var(--text-primary);
    cursor: pointer;
    border-color: var(--text-primary);
    background: var(--pastel-blue);
}

.tl-has-content:hover {
    background: var(--pastel-yellow);
    border-color: var(--text-primary);
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* 今天 */
.tl-today:not(.tl-active) {
    border-color: var(--text-primary);
    border-width: 2px;
    opacity: 1;
}

.tl-today .tl-day {
    color: var(--text-primary);
}

/* 选中 */
.tl-active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #ffffff;
    box-shadow: none;
    transform: translateY(-3px) scale(1.08);
}

.tl-active .tl-day {
    color: #ffffff;
    background: none;
    -webkit-background-clip: unset;
    -webkit-text-fill-color: #ffffff;
    background-clip: unset;
}

.tl-active .tl-wd {
    color: rgba(255,255,255,0.7);
}

.tl-active .tl-dot {
    background: #ffffff;
    box-shadow: none;
}

/* ===== 白皮书首页卡片 ===== */
.whitepaper-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.whitepaper-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 16px;
    padding: 32px 24px;
    background: rgba(255, 255, 255, 0.1);
    border: 1.5px solid rgba(255, 255, 255, 0.2);
    border-radius: 0;
    text-decoration: none;
    color: #f7c8b9;
    transition: all 0.25s ease;
}


.whitepaper-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.3);
    color: inherit;
}

.wp-icon {
    font-size: 3rem;
    min-width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.15);
    color: #f7c8b9;
    border-radius: 0;
    flex-shrink: 0;
}


.wp-info {
    flex: 1;
}

.wp-info h3 {
    font-size: 1.25rem;
    margin-bottom: 4px;
    font-weight: 600;
}

.wp-author {
    font-size: 0.85rem;
    color: #c9b3a8;
    margin-bottom: 8px;
}

.wp-desc {
    font-size: 0.88rem;
    color: #c9b3a8;
    line-height: 1.65;
    margin-bottom: 12px;
}

.wp-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.wp-tags span {
    padding: 3px 10px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 9999px;
    font-size: 0.75rem;
    color: #f7c8b9;
}

.wp-arrow {
    font-size: 1.2rem;
    color: #c9b3a8;
    flex-shrink: 0;
    transition: all 0.25s;
    margin-top: 4px;
}

.whitepaper-card:hover .wp-arrow {
    transform: translateX(5px);
    color: #f7c8b9;
}

/* ===== 白皮书学习页 ===== */
.wp-page-icon {
    font-size: 3.5rem;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--text-primary);
    color: #ffffff;
    border-radius: 0;
    margin: 0 auto 16px;
    box-shadow: none;
}

.wp-page-icon.wp-eth {
    background: var(--text-primary);
    box-shadow: none;
}

.wp-page-icon.wp-bnb {
    background: var(--text-primary);
    box-shadow: none;
}

.wp-page-author {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 4px;
}

.wp-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 36px;
    margin-bottom: 28px;
    transition: border-color 0.3s;
}

.wp-section:hover {
    border-color: var(--border-color-hover);
}

.wp-section-header {
    margin-bottom: 24px;
}

.wp-chapter {
    display: inline-block;
    padding: 4px 14px;
    background: rgba(139, 92, 246, 0.12);
    color: var(--accent-purple);
    border-radius: var(--radius-xs);
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.wp-section-header h2 {
    font-size: 1.35rem;
    margin-top: 8px;
    font-weight: 600;
}

/* ===== 语音选择器 ===== */
.voice-picker {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 16px;
}

.voice-picker label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.voice-picker select {
    padding: 6px 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0;
    color: var(--text-primary);
    font-size: 0.85rem;
    outline: none;
    cursor: pointer;
    max-width: 280px;
    transition: border-color 0.2s;
}

.voice-picker select:focus {
    border-color: var(--accent-blue);
}

/* ===== 发音按钮 ===== */
.speak-btn {
    background: var(--pastel-blue);
    border: 1px solid #c0cde8;
    border-radius: 9999px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.8rem;
    padding: 4px 10px;
    transition: all 0.2s;
    flex-shrink: 0;
    font-weight: 500;
}

.speak-btn:hover {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #ffffff;
}

.speak-btn:active {
    transform: scale(0.95);
}

.speak-btn.speaking,
.speak-btn-sm.speaking {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #ffffff;
}

[data-theme="light"] .speak-btn {
    background: rgba(126, 146, 168, 0.1);
    border-color: rgba(126, 146, 168, 0.25);
    color: var(--accent-blue);
}

[data-theme="light"] .speak-btn:hover {
    background: rgba(126, 146, 168, 0.18);
    border-color: rgba(126, 146, 168, 0.4);
}

.speak-full {
    margin-bottom: 14px;
    padding: 8px 18px;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
    background: rgba(75, 141, 248, 0.12);
    border-color: rgba(75, 141, 248, 0.3);
    letter-spacing: 0.02em;
}

.speak-full:hover {
    background: rgba(75, 141, 248, 0.22);
    border-color: var(--accent-blue);
}

/* ===== 词汇库页面 ===== */
.search-bar {
    margin-bottom: 20px;
}

.search-bar input {
    width: 100%;
    padding: 14px 20px;
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: all 0.2s;
}

.search-bar input::placeholder {
    color: var(--text-muted);
}

.search-bar input:focus {
    border-color: var(--text-primary);
    box-shadow: none;
}

.filter-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 20px;
    background: transparent;
    border: 1.5px solid var(--text-primary);
    border-radius: 9999px;
    color: var(--text-primary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-btn:hover {
    border-color: var(--text-primary);
    color: #fff;
    background: var(--text-primary);
}

.filter-btn.active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: white;
    box-shadow: none;
}

.vocab-count {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 20px;
}

.vocab-row {
    display: flex;
    align-items: baseline;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid #e0dcd6;
    border-radius: 0;
    margin-bottom: 8px;
    transition: transform 0.15s ease, background 0.15s;
}

.vocab-row:hover {
    background: var(--pastel-yellow);
    border-color: var(--text-primary);
    transform: translateX(4px);
}

.vocab-row-word {
    font-weight: 700;
    color: var(--accent-cyan);
    min-width: 180px;
    font-size: 1rem;
}

.vocab-row-def {
    flex: 1;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.vocab-row-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    min-width: 120px;
}

.vocab-row-source {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.vocab-row-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ===== 关于页面 ===== */
.about-card {
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    padding: 36px;
    margin-bottom: 24px;
}

.about-card h2 {
    font-size: 1.35rem;
    margin-bottom: 16px;
    color: var(--text-primary);
    font-weight: 700;
}

.about-card > p {
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 12px;
}

.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 20px;
}

.about-value {
    text-align: center;
    padding: 28px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.about-value:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-2px);
}

.about-value-icon {
    width: 44px;
    height: 44px;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
}

.about-value-icon--blue   { color: var(--text-primary); background: var(--pastel-blue); }
.about-value-icon--cyan   { color: var(--text-primary); background: var(--pastel-mint); }
.about-value-icon--purple { color: var(--text-primary); background: var(--pastel-pink); }

.about-value h3 {
    font-size: 1rem;
    margin-bottom: 8px;
}

.about-value p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.about-sources {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 16px;
}

.about-source-group h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--accent-blue);
}

.about-source-group ul {
    list-style: none;
    padding: 0;
}

.about-source-group li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 4px 0;
}

.about-steps {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 16px;
}

.about-step {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: var(--pastel-mint);
    border-radius: 0;
    border: 1.5px solid var(--text-primary);
    transition: all 0.2s;
}

.about-step:hover {
    box-shadow: none;
}

.about-step-num {
    width: 36px;
    height: 36px;
    min-width: 36px;
    border-radius: 0;
    background: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    font-size: 0.9rem;
}

.about-step h3 {
    font-size: 1rem;
    margin-bottom: 4px;
}

.about-step p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: #d0cdc8;
    border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
    background: #b0ada8;
}

/* ===== 选中文字样式 ===== */
::selection {
    background: var(--pastel-yellow);
    color: var(--text-primary);
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .hero {
        padding: 140px 0 80px;
    }

    .hero h1 {
        font-size: 2.4rem;
    }

    .hero-desc {
        font-size: 1rem;
    }

    .hero-desc br {
        display: none;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-duo {
        grid-template-columns: 1fr;
    }

    .hero-stats {
        gap: 30px;
    }

    .stat-number {
        font-size: 1.6rem;
    }

    .card-grid {
        max-width: 100%;
    }

    .steps {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(250, 249, 246, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px 24px;
        gap: 4px;
        border-bottom: 1px solid #e0dcd6;
    }

    .nav-links.show {
        display: flex;
    }

    [data-theme="light"] .nav-links {
        background: rgba(250, 249, 246, 0.98);
    }

    .mobile-menu-btn {
        display: block;
    }

    .nav-user-btn {
        padding: 5px 10px;
        font-size: 0.78rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 24px;
    }

    .lesson-card {
        padding: 24px;
    }

    .lesson-content-en {
        padding: 20px;
        font-size: 1.05rem;
        line-height: 2;
    }

    .lesson-content-zh {
        padding: 16px 20px;
    }

    .vocab-list {
        grid-template-columns: 1fr;
    }

    .vocab-row {
        flex-direction: column;
        gap: 8px;
    }

    .vocab-row-word {
        min-width: auto;
    }

    .vocab-row-meta {
        flex-direction: row;
        gap: 12px;
        align-items: center;
        min-width: auto;
    }

    .about-values {
        grid-template-columns: 1fr;
    }

    .about-sources {
        grid-template-columns: 1fr;
    }

    .about-card {
        padding: 24px;
    }

    .whitepaper-grid {
        grid-template-columns: 1fr;
    }

    .whitepaper-card {
        flex-direction: column;
        text-align: center;
        padding: 24px;
    }

    .wp-arrow {
        display: none;
    }

    .wp-section {
        padding: 24px;
    }

    .timeline-wrapper {
        max-width: 100%;
    }

    .tl-item {
        min-width: 46px;
    }

    .timeline-arrow {
        width: 30px;
        height: 30px;
        font-size: 1.1rem;
    }
}

/* ===== 阅读模式切换 ===== */
.read-mode-bar {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-bottom: 24px;
    padding: 6px;
    background: var(--bg-card);
    border: 1.5px solid var(--text-primary);
    border-radius: 0;
    max-width: 420px;
    margin-left: auto;
    margin-right: auto;
}

.read-mode-btn {
    padding: 8px 18px;
    background: none;
    border: none;
    border-radius: 0;
    color: var(--text-muted);
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.read-mode-btn:hover {
    color: var(--text-primary);
    background: var(--pastel-yellow);
}

.read-mode-btn.active {
    background: var(--text-primary);
    color: white;
    box-shadow: none;
}

/* 隐藏中文区域 */
.mode-en-only .lesson-content-zh { display: none; }

/* 揭示模式：中文默认模糊 */
.mode-reveal .lesson-content-zh {
    filter: blur(8px);
    cursor: pointer;
    transition: filter 0.3s;
    position: relative;
}
.mode-reveal .lesson-content-zh::after {
    content: '点击查看翻译';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    filter: none;
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 600;
    background: var(--text-primary);
    padding: 6px 16px;
    border-radius: 0;
}
.mode-reveal .lesson-content-zh.revealed {
    filter: none;
    cursor: default;
}
.mode-reveal .lesson-content-zh.revealed::after {
    display: none;
}

/* ===== 难度筛选栏 ===== */
.daily-filter-bar {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.daily-filter-btn {
    padding: 7px 18px;
    background: var(--bg-card);
    border: 1.5px solid var(--text-primary);
    border-radius: 9999px;
    color: var(--text-secondary);
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.2s;
}

.daily-filter-btn:hover {
    background: var(--pastel-yellow);
    color: var(--text-primary);
}

.daily-filter-btn.active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: white;
    box-shadow: none;
}

/* ===== 全站搜索 ===== */
.global-search-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(26, 26, 26, 0.4);
    backdrop-filter: blur(12px);
    display: none;
    justify-content: center;
    padding-top: 15vh;
}

.global-search-overlay.open {
    display: flex;
}

.global-search-box {
    width: 90%;
    max-width: 640px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 0;
    max-height: 70vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: none;
    animation: fadeInUp 0.25s ease-out;
}

.global-search-input {
    width: 100%;
    padding: 20px 24px;
    background: none;
    border: none;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.1rem;
    outline: none;
}

.global-search-input::placeholder {
    color: var(--text-muted);
}

.global-search-results {
    overflow-y: auto;
    padding: 16px;
    flex: 1;
}

.search-section-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 8px 8px 4px;
    font-weight: 600;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 0;
    cursor: pointer;
    transition: background 0.15s;
}

.search-result-item:hover {
    background: var(--bg-card-hover);
}

.search-result-icon {
    width: 32px;
    height: 32px;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.search-result-icon.vocab-icon {
    background: var(--pastel-mint);
    color: var(--text-primary);
}

.search-result-icon.article-icon {
    background: var(--pastel-pink);
    color: var(--text-primary);
}

.search-result-text strong {
    font-size: 0.9rem;
    display: block;
}

.search-result-text span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.search-hint {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* 导航栏搜索按钮 */
.nav-search-btn {
    background: none;
    border: 1.5px solid var(--text-primary);
    border-radius: 0;
    color: var(--text-muted);
    padding: 6px 12px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 8px;
}

.nav-search-btn:hover {
    background: var(--text-primary);
    color: #ffffff;
}

.nav-search-btn kbd {
    background: var(--pastel-yellow);
    padding: 1px 6px;
    border-radius: 0;
    font-size: 0.7rem;
    font-family: inherit;
}

/* ===== 单词收藏按钮 ===== */
.vocab-collect-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.78rem;
    padding: 3px 8px;
    transition: all 0.2s;
    margin-left: auto;
    flex-shrink: 0;
}

.vocab-collect-btn:hover {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #ffffff;
}

.vocab-collect-btn.collected {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #ffffff;
}

/* ===== 测验区域 ===== */
.quiz-section {
    margin-top: 32px;
    padding-top: 28px;
    border-top: 1px solid var(--border-color);
}

.quiz-section h3 {
    font-size: 1.05rem;
    margin-bottom: 16px;
    color: var(--accent-green);
    font-weight: 600;
}

.quiz-start-btn {
    display: inline-block;
    padding: 10px 24px;
    background: var(--pastel-green);
    border: 1.5px solid var(--text-primary);
    border-radius: 0;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.quiz-start-btn:hover {
    background: var(--text-primary);
    color: #ffffff;
    transform: translateY(-1px);
}

.quiz-container {
    margin-top: 16px;
}

.quiz-question {
    padding: 20px;
    background: var(--pastel-green);
    border: 1.5px solid #c5d8c0;
    border-radius: 0;
    margin-bottom: 12px;
}

.quiz-question-text {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.quiz-example-text {
    font-size: 0.88rem;
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 12px;
    padding-left: 12px;
    border-left: 3px solid var(--text-primary);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.quiz-option {
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    color: var(--text-secondary);
    font-size: 0.88rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.quiz-option:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
    background: var(--pastel-yellow);
}

.quiz-option.correct {
    background: var(--pastel-green);
    border-color: #4a8a4a;
    color: #2d6b2d;
}

.quiz-option.wrong {
    background: #fde8e8;
    border-color: #d05050;
    color: #d05050;
}

.quiz-option:disabled {
    cursor: default;
    opacity: 0.7;
}

.quiz-score {
    text-align: center;
    padding: 24px;
    background: var(--pastel-yellow);
    border: 1.5px solid var(--text-primary);
    border-radius: 0;
    margin-top: 16px;
}

.quiz-score-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-primary);
    -webkit-text-fill-color: var(--text-primary);
    background: none;
    -webkit-background-clip: unset;
    background-clip: unset;
}

.quiz-score-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ===== 分页 ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    padding: 20px 0 40px;
}

.page-btn {
    min-width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1.5px solid var(--text-primary);
    border-radius: 9999px;
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.page-btn:hover:not(.disabled):not(.active) {
    background: var(--pastel-yellow);
    color: var(--text-primary);
}

.page-btn.active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #fff;
    box-shadow: none;
}

.page-btn.disabled {
    opacity: 0.3;
    cursor: default;
}

/* ===== 分享按钮 ===== */
.share-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.78rem;
    padding: 3px 8px;
    transition: all 0.2s;
    flex-shrink: 0;
}

.share-btn:hover {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #ffffff;
}

/* ===== 单词本页面 ===== */
.wordbook-empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.wordbook-empty p {
    margin-bottom: 16px;
}

.review-card {
    max-width: 500px;
    margin: 0 auto;
    perspective: 1000px;
}

.review-card-inner {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    min-height: 250px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
}

.review-card-inner:hover {
    border-color: var(--border-color-hover);
}

.review-card-word {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-cyan);
    margin-bottom: 12px;
}

.review-card-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.review-card-answer {
    display: none;
    flex-direction: column;
    gap: 8px;
}

.review-card-answer.show {
    display: flex;
}

.review-card-def {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.review-card-example {
    font-size: 0.88rem;
    color: var(--text-muted);
    font-style: italic;
}

.review-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 20px;
}

.review-btn-wrong,
.review-btn-correct {
    padding: 10px 28px;
    border: 1.5px solid var(--text-primary);
    border-radius: 9999px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.review-btn-wrong {
    background: #fde8e8;
    color: #d05050;
    border-color: #d05050;
}

.review-btn-wrong:hover {
    background: #d05050;
    color: #ffffff;
}

.review-btn-correct {
    background: var(--pastel-green);
    color: #2d6b2d;
    border-color: #2d6b2d;
}

.review-btn-correct:hover {
    background: #2d6b2d;
    color: #ffffff;
}

.review-progress {
    text-align: center;
    margin-bottom: 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== 模态框（分享预览）===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 3000;
    background: rgba(26, 26, 26, 0.4);
    backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
}

.modal-overlay.open { display: flex; }

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    max-width: 90%;
    text-align: center;
}

.modal-content img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
}

.modal-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.wordbook-nav-badge {
    background: var(--text-primary);
    color: white;
    font-size: 0.65rem;
    padding: 1px 6px;
    border-radius: 0;
    margin-left: 4px;
    font-weight: 700;
}

/* ===== 浅色主题 · 莫兰迪色系 ===== */
[data-theme="light"] {
    /* Same as root — light is now default */
}

/* ===== 深色主题 ===== */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #222222;
    --bg-card: #2a2a2a;
    --bg-card-hover: #333333;
    --text-primary: #f0ede8;
    --text-secondary: #b0ada8;
    --text-muted: #999999;
    --border-color: #555555;
    --border-color-hover: #888888;
    --pastel-pink: #4a3538;
    --pastel-green: #2f3e2d;
    --pastel-yellow: #3e3a28;
    --pastel-blue: #2d3340;
    --pastel-peach: #3e3230;
    --pastel-mint: #283830;
    --color-easy: #4ade80;
    --color-medium: #fbbf24;
    --color-hard: #f87171;
    --color-info: #60a5fa;
    --color-success: #34d399;
}

[data-theme="dark"] .navbar {
    background: rgba(26, 26, 26, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom-color: #333;
}

[data-theme="dark"] .navbar.scrolled {
    background: rgba(26, 26, 26, 0.98);
}

[data-theme="dark"] .hero-bg-effect {
    display: none;
}

[data-theme="dark"] .skeleton-line,
[data-theme="dark"] .skeleton-block {
    background: linear-gradient(90deg, #333 25%, #444 50%, #333 75%);
    background-size: 200% 100%;
}

[data-theme="dark"] .nav-links {
    background: rgba(26, 26, 26, 0.98) !important;
    border-bottom-color: #333;
}

[data-theme="dark"] .auth-card,
[data-theme="dark"] .auth-input {
    background: #2a2a2a;
    border-color: #555;
}

[data-theme="dark"] .auth-input:focus {
    border-color: var(--text-primary);
}

[data-theme="dark"] .dialog-card,
[data-theme="dark"] .mission-card,
[data-theme="dark"] .dash-card,
[data-theme="dark"] .hotword-card,
[data-theme="dark"] .achievement-badge,
[data-theme="dark"] .mastery-summary {
    border-color: #444;
}

[data-theme="dark"] .quiz-option {
    border-color: #444;
}

[data-theme="dark"] .quiz-question {
    border-color: #3a4a3a;
}

[data-theme="dark"] .kp-item {
    border-color: #4a4530;
}

[data-theme="dark"] .dialog-culture-tip {
    border-color: #304030;
}

[data-theme="dark"] .speaker-a .dialog-bubble {
    border-color: #3a4050;
}

[data-theme="dark"] .speaker-b .dialog-bubble {
    border-color: #503a38;
}

[data-theme="dark"] .mission-item {
    border-color: #444;
    background: #2a2a2a;
}

[data-theme="dark"] .mission-item.done {
    border-color: #5cc8c8;
    background: #1e3030;
    color: #5cc8c8;
}

[data-theme="dark"] .mission-check {
    border-color: #666;
}

[data-theme="dark"] .mission-item.done .mission-check {
    background: #5cc8c8;
    border-color: #5cc8c8;
    color: #1a1a1a;
}

[data-theme="dark"] .mastery-bar-bg,
[data-theme="dark"] .mastery-summary-bar,
[data-theme="dark"] .bar-track,
[data-theme="dark"] .source-bar-bg,
[data-theme="dark"] .dash-hm-cell {
    background: #333;
}

[data-theme="dark"] .dash-hm-cell[data-level="1"] { background: #2d3340; }
[data-theme="dark"] .dash-hm-cell[data-level="2"] { background: #3a4560; }
[data-theme="dark"] .dash-hm-cell[data-level="3"] { background: #4a5878; }
[data-theme="dark"] .dash-hm-cell[data-level="4"] { background: #5a6a90; }
[data-theme="dark"] .dash-hm-cell[data-level="5"] { background: #6a80a8; }

[data-theme="dark"] .bar-fill,
[data-theme="dark"] .source-bar-fill {
    background: var(--text-primary);
}

[data-theme="dark"] .global-search-overlay {
    background: rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .quiz-option.correct {
    background: #2a3a2a;
    border-color: #4a7a4a;
    color: #8ac88a;
}

[data-theme="dark"] .quiz-option.wrong {
    background: #3a2828;
    border-color: #8a4040;
    color: #d08080;
}

[data-theme="dark"] .review-btn-wrong {
    background: #3a2828;
    color: #d08080;
    border-color: #8a4040;
}

[data-theme="dark"] .review-btn-correct {
    background: #2a3a2a;
    color: #8ac88a;
    border-color: #4a7a4a;
}

[data-theme="dark"] .hotword-trend.hot {
    background: #3a2828;
    color: #d08080;
}

[data-theme="dark"] .hotword-trend.rising {
    background: #3e3a28;
    color: #c0a050;
}

[data-theme="dark"] .hotword-trend.stable {
    background: #2a3a2a;
    color: #8ac88a;
}

[data-theme="dark"] .auth-tabs {
    background: #333;
}

[data-theme="dark"] .auth-tab.active {
    background: #2a2a2a;
}

[data-theme="dark"] .theme-toggle::before {
    width: 14px;
    height: 14px;
    background: #f0ede8;
    box-shadow: none;
    transform: rotate(180deg);
}

[data-theme="dark"] ::selection {
    background: #4a5878;
}

[data-theme="dark"] .whitepaper-card {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
}


[data-theme="dark"] .wp-icon,
[data-theme="dark"] .wp-page-icon {
    background: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .wp-tags span {
    border-color: #888;
    color: var(--text-secondary);
}

[data-theme="dark"] .about-step {
    border-color: #555;
}

[data-theme="dark"] .about-step-num {
    background: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .about-value {
    border-color: #555;
}

[data-theme="dark"] .lesson-card {
    background: var(--bg-card);
    border-color: #444;
}

[data-theme="dark"] .lesson-content-en {
    background: var(--pastel-yellow);
}

[data-theme="dark"] .lesson-content-zh {
    background: var(--pastel-peach);
}

[data-theme="dark"] .grammar-item {
    background: rgba(139, 92, 246, 0.12);
    border-color: rgba(139, 92, 246, 0.25);
}
[data-theme="dark"] .grammar-item:hover {
    background: rgba(139, 92, 246, 0.18);
    border-color: rgba(139, 92, 246, 0.35);
}
[data-theme="dark"] .grammar-pattern {
    color: #c4b5fd;
}
[data-theme="dark"] .grammar-example {
    color: var(--text-primary);
    opacity: 0.95;
}
[data-theme="dark"] .grammar-example-zh {
    color: #ccc;
    border-left-color: rgba(139, 92, 246, 0.4);
}
[data-theme="dark"] .grammar-explanation {
    color: #d0cdc8;
}

[data-theme="dark"] .vocab-row {
    background: var(--bg-card);
    border-color: #444;
}

[data-theme="dark"] .vocab-row-word {
    color: #5cc8c8;
}

[data-theme="dark"] .vocab-row:hover {
    background: var(--pastel-yellow);
}

[data-theme="dark"] .search-bar input,
[data-theme="dark"] .search-input {
    background: var(--bg-card);
    border-color: #555;
    color: var(--text-primary);
}

[data-theme="dark"] .page-header {
    background: #1a1e2e;
}

[data-theme="dark"] .page-header.page-header-green {
    background: #1a251a;
}

[data-theme="dark"] .page-header.page-header-yellow {
    background: #2a2518;
}

[data-theme="dark"] .page-header.page-header-pink {
    background: #2a1e1e;
}

[data-theme="dark"] .page-header.page-header-peach {
    background: #2a2018;
}

[data-theme="dark"] .page-header.page-header-mint {
    background: #1a2520;
}

[data-theme="dark"] .filter-btn {
    border-color: #555;
}

[data-theme="dark"] .filter-btn.active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .diff-btn,
[data-theme="dark"] .daily-filter-btn {
    border-color: #555;
}

[data-theme="dark"] .diff-btn.active,
[data-theme="dark"] .daily-filter-btn.active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .page-btn {
    border-color: #555;
}

[data-theme="dark"] .page-btn.active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .btn-roleplay {
    border-color: #555;
}

[data-theme="dark"] .btn-roleplay:hover {
    background: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .read-mode-bar {
    border-color: #555;
}

[data-theme="dark"] .read-mode-btn.active {
    background: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .nav-search-btn {
    border-color: #555;
}

[data-theme="dark"] .theme-toggle {
    border-color: #555;
}

[data-theme="dark"] .nav-user-btn {
    border-color: #555;
}

[data-theme="dark"] .nav-user-btn:hover {
    background: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .speak-btn {
    background: var(--pastel-blue);
    border-color: #3a4560;
}

[data-theme="dark"] .speak-btn-sm {
    background: var(--pastel-blue);
}

[data-theme="dark"] .dictation-play-btn {
    background: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .dash-kpi {
    background: var(--pastel-yellow);
}

[data-theme="dark"] .achievement-toast {
    background: var(--pastel-yellow);
    border-color: #555;
}

/* 深色模式日历 */
[data-theme="dark"] .tl-item {
    opacity: 0.6;
    color: #888;
}

[data-theme="dark"] .tl-has-content {
    opacity: 1;
    background: #3a4560;
    border-color: #8899bb;
    color: #ffffff;
}

[data-theme="dark"] .tl-has-content:hover {
    background: #4a5878;
    border-color: #aabbdd;
    color: #ffffff;
}

[data-theme="dark"] .tl-today:not(.tl-active) {
    border-color: #aabbdd;
    border-width: 2px;
    opacity: 1;
}

[data-theme="dark"] .tl-today .tl-day {
    color: #ffffff;
}

[data-theme="dark"] .tl-active {
    background: #f0ede8;
    border-color: #f0ede8;
    color: #1a1a1a;
}

[data-theme="dark"] .tl-active .tl-day {
    color: #1a1a1a;
    -webkit-text-fill-color: #1a1a1a;
}

[data-theme="dark"] .tl-active .tl-wd {
    color: #555;
}

[data-theme="dark"] .tl-active .tl-dot {
    background: #1a1a1a;
}

[data-theme="dark"] .tl-dot {
    background: #8899bb;
}

[data-theme="dark"] .timeline-arrow {
    border-color: #666;
    color: #ccc;
    background: #2a2a2a;
}

[data-theme="dark"] .timeline-arrow:hover {
    background: #f0ede8;
    color: #1a1a1a;
    border-color: #f0ede8;
}

[data-theme="dark"] .empty-state-cta {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .hero .btn-primary {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .hero .btn-secondary {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

[data-theme="dark"] .note-toggle-btn.has-note {
    background: var(--pastel-yellow);
    border-color: #555;
}

[data-theme="dark"] .vocab-collect-btn.collected {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .auth-google-btn {
    background: var(--bg-secondary);
    border-color: #555;
}

[data-theme="dark"] .auth-btn {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #1a1a1a;
}

[data-theme="dark"] .card {
    border-color: #444;
}

[data-theme="dark"] .section-dark {
    background: #111111;
}

/* Dark mode section colors — deeper, muted versions */
[data-theme="dark"] .section-yellow {
    background: #2a2518;
}

[data-theme="dark"] .section-blue {
    background: #1a1e2e;
}

[data-theme="dark"] .section-green {
    background: #1a251a;
}

[data-theme="dark"] .section-pink {
    background: #2a1e1e;
}

[data-theme="dark"] .section-peach {
    background: #2a2018;
}

[data-theme="dark"] .section-mint {
    background: #1a2520;
}

[data-theme="dark"] .section-purple {
    background: #1e1a2e;
}

[data-theme="dark"] .hotwords-section {
    background: #111111;
}

[data-theme="dark"] .footer {
    background: #2a2018;
}

[data-theme="dark"] .hero {
    background: #2a1e1e;
}

[data-theme="dark"] .stats-card {
    background: var(--pastel-yellow);
}

[data-theme="dark"] .daily-quote {
    background: transparent;
    border-left-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .quiz-score {
    background: var(--pastel-yellow);
    border-color: #555;
}

[data-theme="dark"] .vocab {
    color: #5cc8c8;
    border-bottom-color: #5cc8c8;
}

[data-theme="dark"] .vocab:hover {
    border-bottom-color: #7adada;
}

[data-theme="dark"] .vocab-tip {
    color: #5cc8c8;
    border-color: #5cc8c8;
}

[data-theme="dark"] .vocab-word {
    color: #5cc8c8;
}

[data-theme="dark"] .vocab-section h3 {
    color: #5cc8c8;
}

[data-theme="dark"] .vocab-item {
    background: rgba(92, 200, 200, 0.08);
    border-color: rgba(92, 200, 200, 0.15);
}

[data-theme="dark"] .vocab-item:hover {
    background: rgba(92, 200, 200, 0.14);
    border-color: rgba(92, 200, 200, 0.3);
}

[data-theme="dark"] .quiz-section h3 {
    color: #5cc8c8;
}

[data-theme="light"] body {
}

[data-theme="light"] .navbar {
    background: rgba(250, 249, 246, 0.95);
    border-bottom-color: #e0dcd6;
}

[data-theme="light"] .navbar.scrolled {
    background: rgba(250, 249, 246, 0.98);
    box-shadow: none;
}

[data-theme="light"] .hero {
    background: var(--pastel-pink);
}

[data-theme="light"] .hero-bg-effect {
    display: none;
}

[data-theme="light"] .card,
[data-theme="light"] .lesson-card,
[data-theme="light"] .whitepaper-card {
}

[data-theme="light"] .section-dark {
    background: #1a1a1a;
}

[data-theme="light"] .global-search-overlay {
    background: rgba(58, 54, 50, 0.2);
}

[data-theme="light"] .global-search-box {
    background: var(--bg-card);
    box-shadow: 0 16px 48px rgba(58, 54, 50, 0.12);
}

/* ===== 主题切换按钮 ===== */
.theme-toggle {
    width: 34px;
    height: 34px;
    border-radius: 0;
    border: 1.5px solid var(--text-primary);
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.25s;
    flex-shrink: 0;
    padding: 0;
    font-size: 0;
    color: transparent;
    overflow: hidden;
}

.theme-toggle::before {
    content: '';
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: transparent;
    box-shadow: inset -6px -1px 0 0 var(--text-primary);
    transition: all 0.35s ease;
}

.theme-toggle:hover {
    background: var(--text-primary);
}

.theme-toggle:hover::before {
    box-shadow: inset -6px -1px 0 0 #ffffff;
}

[data-theme="light"] .theme-toggle {
    border-color: var(--text-primary);
    background: transparent;
}

[data-theme="light"] .theme-toggle:hover {
    background: var(--text-primary);
}

[data-theme="light"] .theme-toggle::before {
    width: 14px;
    height: 14px;
    background: #c4a46c;
    box-shadow: none;
    transform: rotate(180deg);
}

[data-theme="light"] .theme-toggle:hover::before {
    background: #ffffff;
}

/* ===== 打字机光标 ===== */
.typewriter-cursor {
    font-weight: 100;
    animation: blink 1s step-end infinite;
    color: var(--accent-cyan);
}

@keyframes blink {
    50% { opacity: 0; }
}

/* ===== 仪表盘 ===== */
.dash-kpi-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.dash-kpi {
    background: var(--pastel-yellow);
    border: none;
    border-radius: 0;
    padding: 24px 16px;
    text-align: center;
    transition: all 0.2s;
}

.dash-kpi:hover {
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: none;
}

.dash-kpi-icon {
    width: 38px;
    height: 38px;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 10px;
}

.dash-kpi-icon--blue   { color: var(--text-primary); background: var(--pastel-blue); }
.dash-kpi-icon--green  { color: var(--text-primary); background: var(--pastel-green); }
.dash-kpi-icon--cyan   { color: var(--text-primary); background: var(--pastel-mint); }
.dash-kpi-icon--purple { color: var(--text-primary); background: var(--pastel-pink); }

.dash-kpi-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
}

.dash-kpi-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.dash-charts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.dash-card {
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    padding: 24px;
    transition: transform 0.2s ease, border-color 0.2s, box-shadow 0.2s;
}

.dash-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

.dash-card-title {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

/* Mastery bars */
.mastery-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.mastery-label {
    font-size: 0.78rem;
    font-weight: 600;
    width: 50px;
    text-align: right;
}

.mastery-bar-bg {
    flex: 1;
    height: 8px;
    background: #f0ede8;
    border-radius: 0;
    overflow: hidden;
}

[data-theme="light"] .mastery-bar-bg {
    background: #f0ede8;
}

.mastery-bar-fill {
    height: 100%;
    border-radius: 0;
    transition: width 0.8s ease;
}

.mastery-count {
    font-size: 0.78rem;
    color: var(--text-muted);
    width: 24px;
}

/* Bar chart */
.dash-bar-chart {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    height: 160px;
    padding-top: 10px;
}

.bar-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    height: 100%;
}

.bar-value {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 600;
}

.bar-track {
    flex: 1;
    width: 100%;
    background: #f0ede8;
    border-radius: 0;
    display: flex;
    align-items: flex-end;
    overflow: hidden;
}

[data-theme="light"] .bar-track {
    background: #f0ede8;
}

.bar-fill {
    width: 100%;
    background: var(--text-primary);
    border-radius: 0;
    min-height: 2px;
    transition: height 0.6s ease;
}

.bar-label {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* Heatmap */
.dash-heatmap {
    display: grid;
    grid-template-columns: repeat(13, 1fr);
    gap: 3px;
}

.dash-hm-cell {
    aspect-ratio: 1;
    border-radius: 0;
    background: #f0ede8;
    max-width: 20px;
    transition: all 0.15s;
}

[data-theme="light"] .dash-hm-cell {
    background: #f0ede8;
}

[data-theme="light"] .dash-hm-cell[data-level="1"] { background: var(--pastel-blue); }
[data-theme="light"] .dash-hm-cell[data-level="2"] { background: #b8c8e8; }
[data-theme="light"] .dash-hm-cell[data-level="3"] { background: #95aed5; }
[data-theme="light"] .dash-hm-cell[data-level="4"] { background: #7090c0; }
[data-theme="light"] .dash-hm-cell[data-level="5"] { background: #4a6ea0; }

.dash-hm-cell[data-level="1"] { background: var(--pastel-blue); }
.dash-hm-cell[data-level="2"] { background: #b8c8e8; }
.dash-hm-cell[data-level="3"] { background: #95aed5; }
.dash-hm-cell[data-level="4"] { background: #7090c0; }
.dash-hm-cell[data-level="5"] { background: #4a6ea0; }

.dash-hm-cell:hover {
    transform: scale(1.4);
}

.dash-heatmap-legend {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 4px;
    margin-top: 8px;
    font-size: 0.68rem;
    color: var(--text-muted);
}

.dash-heatmap-legend span {
    width: 12px;
    height: 12px;
    border-radius: 0;
    display: inline-block;
}

/* Source distribution */
.source-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.source-name {
    font-size: 0.82rem;
    width: 120px;
    text-align: right;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.source-bar-bg {
    flex: 1;
    height: 6px;
    background: #f0ede8;
    border-radius: 0;
    overflow: hidden;
}

[data-theme="light"] .source-bar-bg {
    background: #f0ede8;
}

.source-bar-fill {
    height: 100%;
    background: var(--text-primary);
    border-radius: 0;
    transition: width 0.6s ease;
}

.source-count {
    font-size: 0.72rem;
    color: var(--text-muted);
    width: 40px;
}

/* ===== 骨架屏 ===== */
.skeleton-card {
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    padding: 28px;
    margin-bottom: 24px;
}

.skeleton-line {
    height: 14px;
    background: linear-gradient(90deg, #f0ede8 25%, #faf9f6 50%, #f0ede8 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 0;
    margin-bottom: 12px;
}

.skeleton-line.w40 { width: 40%; }
.skeleton-line.w50 { width: 50%; }
.skeleton-line.w60 { width: 60%; }
.skeleton-line.w70 { width: 70%; }
.skeleton-line.w80 { width: 80%; }

.skeleton-block {
    height: 120px;
    background: linear-gradient(90deg, #f0ede8 25%, #faf9f6 50%, #f0ede8 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 0;
    margin-bottom: 12px;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ===== 浮动目录 ===== */
.floating-toc {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 90;
    display: flex;
    flex-direction: column;
    gap: 2px;
    max-width: 140px;
}

.toc-title {
    font-size: 0.68rem;
    color: var(--text-muted);
    padding: 4px 10px;
    font-weight: 600;
}

.toc-item {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 6px 10px;
    border-left: 2px solid var(--border-color);
    transition: all 0.2s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.toc-item:hover {
    color: var(--text-secondary);
    border-left-color: var(--accent-blue);
}

.toc-item.active {
    color: var(--accent-blue);
    border-left-color: var(--accent-blue);
    font-weight: 600;
}

/* ===== 词汇库掌握度总览 ===== */
.mastery-overview {
    margin-bottom: 20px;
}

.mastery-summary {
    display: flex;
    gap: 24px;
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    padding: 16px 20px;
}

.mastery-summary-item {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.mastery-summary-bar {
    flex: 1;
    height: 6px;
    background: #f0ede8;
    border-radius: 0;
    overflow: hidden;
}

[data-theme="light"] .mastery-summary-bar {
    background: #f0ede8;
}

.mastery-summary-fill {
    height: 100%;
    border-radius: 0;
    transition: width 0.8s ease;
}

/* ===== 日常对话页面 ===== */
.dialog-category-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.dialog-difficulty-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.diff-btn {
    background: var(--bg-card);
    border: 1.5px solid var(--text-primary);
    color: var(--text-secondary);
    padding: 6px 16px;
    border-radius: 9999px;
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.2s;
}

.diff-btn:hover {
    background: var(--pastel-yellow);
    color: var(--text-primary);
}

.diff-btn.active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #fff;
}

/* 对话卡片 */
.dialog-card {
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    padding: 28px;
    margin-bottom: 24px;
    transition: transform 0.2s ease, border-color 0.2s, box-shadow 0.2s;
}

.dialog-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

.dialog-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 24px;
}

.dialog-scene {
    display: flex;
    align-items: center;
    gap: 12px;
}

.dialog-scene-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.dialog-scene-en {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.dialog-diff {
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--pastel-yellow);
    padding: 4px 12px;
    border-radius: 0;
    white-space: nowrap;
}

[data-theme="light"] .dialog-diff {
    background: var(--pastel-yellow);
}

/* 对话行 */
.dialog-lines {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.dialog-line {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.dialog-line.speaker-b {
    flex-direction: row-reverse;
}

.dialog-avatar {
    width: 36px;
    height: 36px;
    border-radius: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
}

.speaker-a .dialog-avatar {
    background: var(--pastel-blue);
    color: var(--text-primary);
}

.speaker-b .dialog-avatar {
    background: var(--pastel-pink);
    color: var(--text-primary);
}

.dialog-bubble {
    max-width: 75%;
    padding: 12px 16px;
    border-radius: var(--radius);
    position: relative;
}

.speaker-a .dialog-bubble {
    background: var(--pastel-blue);
    border: 1.5px solid #c0cde8;
    border-radius: 0;
}

.speaker-b .dialog-bubble {
    background: var(--pastel-pink);
    border: 1.5px solid #e0b5ad;
    border-radius: 0;
    text-align: right;
}

.dialog-role {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.dialog-en {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.6;
    transition: filter 0.3s, opacity 0.3s;
    display: flex;
    align-items: flex-start;
    gap: 6px;
}

.speaker-b .dialog-en {
    justify-content: flex-end;
}

.dialog-en.blurred {
    filter: blur(6px);
    cursor: pointer;
    user-select: none;
}

.dialog-en.blurred:hover {
    filter: blur(4px);
}

.dialog-zh {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 4px;
    line-height: 1.5;
}

.speak-btn-sm {
    background: var(--pastel-blue);
    border: none;
    cursor: pointer;
    font-size: 0.7rem;
    padding: 0;
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border-radius: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all 0.2s;
    vertical-align: middle;
    margin-right: 4px;
}

.speak-btn-sm:hover {
    background: var(--text-primary);
    color: #ffffff;
}

/* 关键表达 & 文化贴士 */
.dialog-sections {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    margin-bottom: 16px;
}

.dialog-key-phrases h4,
.dialog-culture-tip h4 {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.kp-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 10px;
    margin-bottom: 20px;
}

.kp-item {
    background: var(--pastel-yellow);
    border: 1px solid #e5ddb5;
    border-radius: 0;
    padding: 10px 14px;
}

[data-theme="light"] .kp-item {
    background: var(--pastel-yellow);
}

.kp-en {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-blue);
    margin-bottom: 2px;
}

.kp-zh {
    font-size: 0.82rem;
    color: var(--text-primary);
}

.kp-usage {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 4px;
    font-style: italic;
}

.dialog-culture-tip {
    background: var(--pastel-mint);
    border: 1px solid #b5d8c0;
    border-radius: 0;
    padding: 16px;
}

.ct-zh {
    font-size: 0.88rem;
    color: var(--text-primary);
    line-height: 1.7;
    margin-bottom: 6px;
}

.ct-en {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.6;
    font-style: italic;
}

/* 角色扮演按钮 */
.dialog-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-roleplay {
    background: var(--bg-card);
    border: 1.5px solid var(--text-primary);
    color: var(--text-secondary);
    padding: 8px 18px;
    border-radius: 9999px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-roleplay:hover {
    background: var(--text-primary);
    color: #ffffff;
}

.btn-roleplay-reset {
    background: #fde8e8;
    border-color: #d05050;
    color: #d05050;
}

.btn-roleplay-reset:hover {
    background: #d05050;
    border-color: #d05050;
    color: #ffffff;
}

/* 角色扮演模式的提示 */
.roleplay-mode .dialog-en.blurred::after {
    content: '点击揭示';
    position: absolute;
    font-size: 0.72rem;
    color: var(--accent-blue);
    filter: none;
    white-space: nowrap;
}

@media (max-width: 1200px) {
    .floating-toc { display: none !important; }
    .dash-charts { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.9rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 16px;
        align-items: center;
    }

    .container {
        padding: 0 16px;
    }

    .section {
        padding: 56px 0;
    }

    .lesson-card {
        padding: 18px;
    }

    .dialog-card {
        padding: 16px;
    }

    .dialog-bubble {
        max-width: 85%;
    }

    .kp-list {
        grid-template-columns: 1fr;
    }

    .dialog-card-header {
        flex-direction: column;
        gap: 8px;
    }
}

/* ===== 登录页 ===== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px 24px 40px;
}

.auth-card {
    width: 100%;
    max-width: 400px;
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    padding: 40px 32px;
    text-align: center;
}

.auth-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: 6px;
}

.auth-subtitle {
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin-bottom: 28px;
}

.auth-tabs {
    display: flex;
    gap: 4px;
    background: var(--pastel-yellow);
    border-radius: 0;
    padding: 3px;
    margin-bottom: 24px;
}

.auth-tab {
    flex: 1;
    padding: 8px 0;
    border: none;
    border-radius: 0;
    background: transparent;
    color: var(--text-muted);
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.auth-tab.active {
    background: var(--bg-card);
    color: var(--text-primary);
    box-shadow: none;
}

.auth-input {
    width: 100%;
    padding: 12px 16px;
    margin-bottom: 12px;
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--text-base);
    outline: none;
    transition: border-color 0.2s;
}

.auth-input:focus {
    border-color: var(--text-primary);
}

.auth-input::placeholder {
    color: var(--text-muted);
}

.auth-btn {
    width: 100%;
    padding: 12px 0;
    margin-top: 8px;
    border: 1.5px solid var(--text-primary);
    border-radius: 0;
    background: var(--text-primary);
    color: #fff;
    font-family: inherit;
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.auth-btn:hover {
    opacity: 0.9;
}

.auth-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.auth-error {
    display: none;
    padding: 10px 14px;
    margin-bottom: 16px;
    border-radius: var(--radius-xs);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #ef4444;
    font-size: var(--text-sm);
    text-align: left;
}

.nav-logout-link {
    color: #b86060 !important;
    border-top: 1px solid var(--border-color);
    margin-top: 4px;
    padding-top: 8px !important;
}

.nav-logout-link:hover {
    color: #d05050 !important;
}

[data-theme="light"] .auth-error {
    background: #fde8e8;
    border-color: #d0a0a0;
    color: #a05050;
}

.nav-logout-link:hover {
    color: #d05050 !important;
}

[data-theme="light"] .nav-logout-link {
    color: #a05050 !important;
}

[data-theme="light"] .nav-logout-link:hover {
    color: #8a3a3a !important;
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
    color: var(--text-muted);
    font-size: var(--text-sm);
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.auth-google-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 11px 0;
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.auth-google-btn:hover {
    border-color: var(--text-primary);
    background: var(--pastel-yellow);
}

.auth-google-icon {
    flex-shrink: 0;
}

/* =============================================
   NEW FEATURES — 2025 升级版
   ============================================= */

/* ===== 页面过渡动画 ===== */
body {
    animation: pageEnter 0.3s ease both;
}
@keyframes pageEnter {
    from { opacity: 0.6; }
    to   { opacity: 1; }
}
body.page-enter {
    opacity: 1;
}

/* ===== 导航下拉改为 click（替代 hover）===== */
.nav-dropdown:hover .nav-dropdown-menu {
    display: none;
}
.nav-dropdown-menu.open {
    display: block !important;
    animation: fadeInUp 0.2s ease-out;
}

/* ===== 微交互动效 ===== */

/* 收藏按钮弹跳 */
@keyframes collectBounce {
    0%   { transform: scale(1); }
    30%  { transform: scale(1.25); }
    50%  { transform: scale(0.9); }
    70%  { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.vocab-collect-btn.just-collected {
    animation: collectBounce 0.5s ease;
}

/* 收藏星星粒子 */
@keyframes particleFly {
    0%   { opacity: 1; transform: translate(0, 0) scale(1); }
    100% { opacity: 0; transform: translate(var(--px), var(--py)) scale(0); }
}

.collect-particle {
    position: absolute;
    pointer-events: none;
    font-size: 14px;
    animation: particleFly 0.6s ease-out forwards;
    z-index: 50;
}

/* 测验选项动效 */
@keyframes quizCorrectPulse {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.02); box-shadow: 0 0 16px rgba(16,185,129,0.3); }
    100% { transform: scale(1); }
}

@keyframes quizWrongShake {
    0%, 100% { transform: translateX(0); }
    20%      { transform: translateX(-6px); }
    40%      { transform: translateX(6px); }
    60%      { transform: translateX(-4px); }
    80%      { transform: translateX(4px); }
}

.quiz-option.correct {
    animation: quizCorrectPulse 0.4s ease;
}

.quiz-option.wrong {
    animation: quizWrongShake 0.4s ease;
}

/* 词汇行 hover 色条 */
.vocab-row {
    position: relative;
    padding-left: 24px;
}

.vocab-row::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--text-primary);
    border-radius: 0;
    transition: height 0.25s ease;
}

.vocab-row:hover::before {
    height: 60%;
}

.vocab-row:hover {
    transform: translateX(4px);
    transition: all 0.25s ease;
}

/* 卡片进入 stagger 弹性 */
@keyframes cardEnter {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.lesson-card,
.dialog-card,
.card {
    animation: cardEnter 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* ===== 成就 Toast ===== */
.achievement-toast {
    position: fixed;
    top: 80px;
    right: -360px;
    z-index: 5000;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 22px;
    background: var(--pastel-yellow);
    border: 1.5px solid var(--text-primary);
    border-radius: 0;
    box-shadow: none;
    transition: right 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    min-width: 280px;
}

.achievement-toast.show {
    right: 24px;
}

.achievement-toast-icon {
    font-size: 2.2rem;
    flex-shrink: 0;
}

.achievement-toast-title {
    font-size: 0.72rem;
    color: var(--accent-blue);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 600;
}

.achievement-toast-name {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 2px 0;
}

.achievement-toast-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== 每日任务卡片 ===== */
.mission-card {
    background: var(--bg-card);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    padding: 24px;
    margin-bottom: 24px;
}

.mission-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
}

.mission-title {
    font-size: 1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.mission-icon {
    font-size: 1.3rem;
}

.mission-progress-ring {
    position: relative;
    width: 48px;
    height: 48px;
}

.mission-progress-ring svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.mission-pct {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.mission-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mission-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border: 1px solid #e0dcd6;
    border-radius: 0;
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: all 0.25s;
}

[data-theme="light"] .mission-item {
    background: var(--bg-secondary);
}

.mission-item.done {
    background: var(--pastel-green);
    border-color: #b5d8b0;
    color: var(--text-primary);
}

.mission-check {
    width: 22px;
    height: 22px;
    border-radius: 0;
    border: 2px solid #e0dcd6;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    flex-shrink: 0;
    transition: all 0.25s;
}

.mission-item.done .mission-check {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: white;
}

.mission-item-icon {
    font-size: 1.1rem;
}

.mission-label {
    flex: 1;
}

.mission-complete {
    text-align: center;
    margin-top: 14px;
    padding: 12px;
    background: var(--pastel-green);
    border-radius: 0;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.92rem;
}

/* ===== 成就展示面板（仪表盘）===== */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
}

.achievement-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 20px 12px;
    background: var(--bg-secondary);
    border: 1.5px solid #e0dcd6;
    border-radius: 0;
    transition: all 0.25s;
}

[data-theme="light"] .achievement-badge {
    background: var(--bg-secondary);
}

.achievement-badge.unlocked {
    border-color: var(--text-primary);
    background: var(--pastel-yellow);
}

.achievement-badge.unlocked:hover {
    transform: translateY(-3px);
    box-shadow: none;
}

.achievement-badge.locked {
    opacity: 0.4;
    filter: grayscale(1);
}

.achievement-badge-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.achievement-badge-title {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.achievement-badge-desc {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* ===== Crypto 热词 ===== */
.hotwords-section {
    padding: 80px 0;
    background: #1a1a1a;
    color: #eee1d3;
}

.hotwords-section .section-title {
    color: #eee1d3;
}

.hotwords-section .section-subtitle {
    color: #c5b9ad;
}

.hotwords-section .container {
    overflow: visible;
}

.hotwords-track {
    display: flex;
    gap: 14px;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding: 4px 0;
    margin: 0 -32px;
    padding-left: 32px;
    padding-right: 32px;
}

.hotwords-track::-webkit-scrollbar { display: none; }

.hotword-card {
    min-width: 240px;
    max-width: 280px;
    flex-shrink: 0;
    padding: 18px 20px;
    background: rgba(255, 255, 255, 0.08);
    border: 1.5px solid rgba(255, 255, 255, 0.15);
    border-radius: 0;
    transition: all 0.25s;
    cursor: default;
}

.hotword-card:hover {
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
}

.hotword-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.hotword-word {
    font-size: 1rem;
    font-weight: 700;
    color: #ffffff;
}

.hotword-trend {
    font-size: 0.68rem;
    padding: 2px 8px;
    border-radius: 9999px;
    font-weight: 600;
}

.hotword-trend.hot {
    background: #fde8e8;
    color: #d05050;
}

.hotword-trend.rising {
    background: var(--pastel-yellow);
    color: #a07000;
}

.hotword-trend.stable {
    background: var(--pastel-green);
    color: #2d6b2d;
}

.hotword-def {
    font-size: 0.82rem;
    color: #c5b9ad;
    line-height: 1.6;
}

/* ===== 听写模式 ===== */
.dictation-area {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
}

.dictation-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 40px;
    margin-bottom: 20px;
}

.dictation-prompt {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.dictation-play-btn {
    width: 64px;
    height: 64px;
    border-radius: 0;
    background: var(--text-primary);
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.25s;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    box-shadow: none;
}

.dictation-play-btn:hover {
    transform: scale(1.08);
    box-shadow: none;
}

.dictation-play-btn:active {
    transform: scale(0.95);
}

.dictation-input {
    width: 100%;
    padding: 14px 20px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
    outline: none;
    transition: border-color 0.25s;
    font-family: inherit;
    letter-spacing: 0.02em;
}

.dictation-input:focus {
    border-color: var(--accent-blue);
}

.dictation-input.correct {
    border-color: var(--accent-green);
    background: rgba(16, 185, 129, 0.06);
}

.dictation-input.wrong {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.06);
}

.dictation-answer {
    margin-top: 16px;
    font-size: 0.92rem;
    color: var(--text-secondary);
}

.dictation-answer .correct-word {
    color: var(--accent-green);
    font-weight: 700;
}

.dictation-controls {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
}

/* ===== 笔记系统 ===== */
.note-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.78rem;
    padding: 3px 8px;
    transition: all 0.2s;
    flex-shrink: 0;
}

.note-toggle-btn:hover {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #ffffff;
}

.note-toggle-btn.has-note {
    border-color: var(--text-primary);
    color: var(--text-primary);
    background: var(--pastel-yellow);
}

.note-editor {
    margin-top: 12px;
    display: none;
}

.note-editor.open {
    display: block;
    animation: fadeInUp 0.2s ease-out;
}

.note-textarea {
    width: 100%;
    min-height: 80px;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-family: inherit;
    line-height: 1.6;
    outline: none;
    resize: vertical;
    transition: border-color 0.2s;
}

.note-textarea:focus {
    border-color: var(--accent-purple);
}

.note-textarea::placeholder {
    color: var(--text-muted);
}

.note-save-hint {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 6px;
    text-align: right;
}

/* ===== 空状态优化 ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-state-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto 24px;
    position: relative;
}

.empty-state-icon svg {
    width: 100%;
    height: 100%;
}

.empty-state-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state-desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 20px;
    line-height: 1.6;
}

.empty-state-cta {
    display: inline-block;
    padding: 10px 24px;
    background: var(--text-primary);
    color: white;
    border-radius: 0;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.25s;
    border: 1.5px solid var(--text-primary);
    cursor: pointer;
    text-decoration: none;
}

.empty-state-cta:hover {
    background: transparent;
    color: var(--text-primary);
}

/* ===== 滚动指示器 ===== */
.scroll-indicator {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-top: 8px;
}

.scroll-indicator::after {
    content: '← 滑动查看更多 →';
    font-size: 0.72rem;
    color: var(--text-muted);
    opacity: 0.6;
}

/* ===== 移动端浮动目录 ===== */
@media (max-width: 1200px) {
    .floating-toc {
        display: none !important;
    }
}

/* ===== 响应式补充 ===== */
@media (max-width: 768px) {
    .achievement-toast {
        left: 16px;
        right: 16px !important;
        min-width: auto;
    }
    .achievement-toast.show {
        right: 16px !important;
    }
    .achievements-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .hotword-card {
        min-width: 200px;
    }
    .mission-card {
        padding: 18px;
    }
}

@media (max-width: 480px) {
    .achievements-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===== 加密热词卡片 ===== */
.hw-term-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 24px;
    margin-bottom: 16px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.hw-term-card:hover {
    border-color: var(--text-muted);
    transform: translateY(-2px);
}

.hw-term-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.hw-term-title-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.hw-term-word {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.hw-term-zh {
    font-size: 0.92rem;
    color: var(--text-muted);
    font-weight: 500;
}

.hw-term-badges {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-shrink: 0;
}

.hw-term-cat {
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: 9999px;
    background: var(--pastel-blue);
    color: var(--text-secondary);
    font-weight: 500;
}

[data-theme="dark"] .hw-term-cat {
    background: rgba(75, 141, 248, 0.15);
    color: #8bb8f8;
}

.hw-term-diff {
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: 9999px;
    border: 1px solid;
    font-weight: 600;
}

.hw-term-body {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.hw-term-def {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.hw-term-def-label {
    flex-shrink: 0;
    font-size: 0.7rem;
    font-weight: 700;
    color: #fff;
    background: var(--text-primary);
    padding: 1px 6px;
    border-radius: 4px;
    margin-top: 2px;
}

.hw-term-def-text {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.hw-term-example {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    border-left: 3px solid var(--pastel-mint);
}

.hw-term-example-en {
    font-size: 0.88rem;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 6px;
    display: flex;
    align-items: flex-start;
    gap: 6px;
}

.hw-term-example-zh {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.6;
    padding-left: 26px;
}

@media (max-width: 768px) {
    .hw-term-header {
        flex-direction: column;
    }
    .hw-term-card {
        padding: 18px;
    }
}

/* English content readability */
.hw-term-def-text,
.hw-term-example-en,
.dialog-en,
.kp-en,
.kp-usage {
    line-height: 1.8;
}

/* ===== 导航分组下拉 ===== */
.nav-dropdown-learn {
    position: relative;
}

.nav-link-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    padding: 7px 14px;
    display: flex;
    align-items: center;
    gap: 4px;
    font-family: inherit;
    transition: color 0.2s, background 0.2s;
    border-radius: 0;
    white-space: nowrap;
}

.nav-link-btn:hover {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.04);
}

.nav-link-btn.active {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.06);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.nav-dropdown-learn .nav-dropdown-menu {
    top: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 140px;
}

/* ===== 随机学习浮动按钮 ===== */
.random-learn-float {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 900;
}

.random-learn-float .btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 20px;
    border-radius: 9999px;
    background: var(--text-primary);
    color: var(--bg-primary);
    font-weight: 600;
    font-size: 0.88rem;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
}

.random-learn-float .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0,0,0,0.2);
}

@media (max-width: 768px) {
    .random-learn-float {
        bottom: 20px;
        right: 16px;
    }
}

/* ===== 收藏按钮（热词/对话） ===== */
.hw-term-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.hw-collect-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    font-size: 0.78rem;
    border-radius: 9999px;
    border: 1px solid var(--border-color);
    background: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}

.hw-collect-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.hw-collect-btn.collected {
    border-color: var(--color-easy);
    color: var(--color-easy);
    background: rgba(34, 197, 94, 0.06);
}

.kp-collect-btn {
    display: inline-block;
    padding: 2px 8px;
    font-size: 0.72rem;
    border-radius: 9999px;
    border: 1px solid var(--border-color);
    background: none;
    color: var(--text-muted);
    cursor: pointer;
    margin-top: 6px;
    transition: all 0.2s;
}

.kp-collect-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

/* ===== 下一步推荐模块 ===== */
.next-step {
    text-align: center;
    padding: 40px 20px;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
}

.next-step-title {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.next-step-links {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.next-step-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border: 1.5px solid var(--border-color);
    border-radius: 9999px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.88rem;
    text-decoration: none;
    transition: all 0.2s;
}

.next-step-link:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

/* ===== 每日一词高亮卡 ===== */
.daily-word-highlight {
    background: var(--pastel-mint);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 20px 24px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.daily-word-badge {
    background: var(--text-primary);
    color: var(--bg-primary);
    font-size: 0.72rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 9999px;
    flex-shrink: 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.daily-word-content {
    flex: 1;
    min-width: 200px;
}

.daily-word-en {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.daily-word-zh {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

[data-theme="dark"] .daily-word-highlight {
    background: var(--pastel-mint);
}

/* ===== 空状态引导卡片 ===== */
.empty-guide-card {
    text-align: center;
    padding: 48px 24px;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
}

.empty-guide-icon {
    font-size: 2rem;
    margin-bottom: 16px;
    color: var(--text-muted);
}

.empty-guide-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-guide-desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 20px;
    line-height: 1.6;
}

.empty-guide-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 24px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.2s;
}

.empty-guide-btn:hover {
    transform: translateY(-1px);
}