```css
/* ==========================================================================
   芒果传媒 - 芒果传媒内容站，综艺剧集一手掌握
   yaszb.cn
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 基础重置与主题变量
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 品牌色 */
    --brand-primary: #1e3a8a;
    --brand-primary-light: #2563eb;
    --brand-secondary: #f97316;
    --brand-secondary-dark: #ea580c;
    --brand-accent: #06b6d4;
    --brand-accent-light: #22d3ee;

    /* 背景 */
    --bg-body: #ffffff;
    --bg-surface: #f8fafc;
    --bg-card: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.72);
    --bg-glass-border: rgba(255, 255, 255, 0.35);

    /* 文字 */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;

    /* 边框 */
    --border-color: #e2e8f0;
    --border-glass: rgba(226, 232, 240, 0.6);

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 40px rgba(30, 58, 138, 0.15);

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition: 0.25s ease;
    --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

    /* 布局 */
    --max-width: 1280px;
    --header-height: 72px;

    /* 渐变 */
    --gradient-brand: linear-gradient(135deg, #1e3a8a 0%, #0f172a 100%);
    --gradient-hero: linear-gradient(135deg, #1e3a8a 0%, #312e81 40%, #0f172a 100%);
    --gradient-accent: linear-gradient(135deg, #f97316 0%, #ec4899 100%);
    --gradient-cyan: linear-gradient(135deg, #06b6d4 0%, #2563eb 100%);
    --gradient-surface: linear-gradient(180deg, rgba(30, 58, 138, 0.04) 0%, rgba(6, 182, 212, 0.04) 100%);
}

/* 暗色模式 */
[data-theme="dark"] {
    --bg-body: #0b1120;
    --bg-surface: #111827;
    --bg-card: #1e293b;
    --bg-glass: rgba(30, 41, 59, 0.72);
    --bg-glass-border: rgba(51, 65, 85, 0.5);

    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;

    --border-color: #334155;
    --border-glass: rgba(51, 65, 85, 0.6);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.2);

    --gradient-brand: linear-gradient(135deg, #1e3a8a 0%, #0b1120 100%);
    --gradient-hero: linear-gradient(135deg, #1e3a8a 0%, #1e1b4b 40%, #0b1120 100%);
    --gradient-surface: linear-gradient(180deg, rgba(37, 99, 235, 0.06) 0%, rgba(6, 182, 212, 0.06) 100%);
}

/* --------------------------------------------------------------------------
   2. 全局样式
   -------------------------------------------------------------------------- */
html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica,
        Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.7;
    transition: background-color var(--transition), color var(--transition);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--brand-primary);
    text-decoration: none;
    transition: color var(--transition), opacity var(--transition);
}

a:hover {
    color: var(--brand-secondary);
}

[data-theme="dark"] a {
    color: var(--brand-accent-light);
}

[data-theme="dark"] a:hover {
    color: var(--brand-secondary);
}

img,
svg {
    max-width: 100%;
    height: auto;
    display: block;
}

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
}

input {
    font-family: inherit;
}

::selection {
    background-color: var(--brand-secondary);
    color: #fff;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--brand-primary);
}

/* --------------------------------------------------------------------------
   3. 布局容器
   -------------------------------------------------------------------------- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* --------------------------------------------------------------------------
   4. 顶部导航 - 毛玻璃效果
   -------------------------------------------------------------------------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--bg-glass);
    border-bottom: 1px solid var(--border-glass);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    transition: background-color var(--transition), border-color var(--transition),
        box-shadow var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: 16px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--text-primary);
    white-space: nowrap;
    transition: opacity var(--transition), transform var(--transition);
}

.logo:hover {
    opacity: 0.85;
    transform: scale(1.02);
    color: var(--text-primary);
}

.logo svg {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    transition: transform var(--transition-slow);
}

.logo:hover svg {
    transform: rotate(-6deg) scale(1.05);
}

/* 主导航 */
.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-links a {
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
    transition: color var(--transition);
}

.nav-links a:hover {
    color: var(--brand-primary);
}

[data-theme="dark"] .nav-links a:hover {
    color: var(--brand-accent-light);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.nav-links a:hover::after {
    width: 100%;
}

/* 头部操作区 */
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* 搜索框 */
.search-box {
    display: flex;
    align-items: center;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 4px 4px 4px 16px;
    transition: border-color var(--transition), box-shadow var(--transition),
        background-color var(--transition);
}

.search-box:focus-within {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.12);
    background-color: var(--bg-card);
}

[data-theme="dark"] .search-box:focus-within {
    border-color: var(--brand-accent);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    font-size: 0.9rem;
    color: var(--text-primary);
    width: 150px;
    padding: 6px 0;
    transition: width var(--transition);
}

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

.search-box input:focus {
    width: 200px;
}

.search-box button {
    background: var(--gradient-brand);
    border: none;
    border-radius: var(--radius-full);
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition),
        box-shadow var(--transition);
    flex-shrink: 0;
}

.search-box button:hover {
    background: var(--gradient-accent);
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
}

.search-box button:active {
    transform: scale(0.95);
}

.search-box button svg {
    width: 16px;
    height: 16px;
    stroke: #fff;
}

/* 主题切换 & 移动端菜单按钮 */
.theme-toggle,
.mobile-menu-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: border-color var(--transition), background-color var(--transition),
        transform var(--transition), box-shadow var(--transition);
    flex-shrink: 0;
}

.theme-toggle:hover,
.mobile-menu-btn:hover {
    border-color: var(--brand-primary);
    background-color: var(--bg-card);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

[data-theme="dark"] .theme-toggle:hover,
[data-theme="dark"] .mobile-menu-btn:hover {
    border-color: var(--brand-accent);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}

.theme-toggle:active,
.mobile-menu-btn:active {
    transform: translateY(0) scale(0.95);
}

.theme-toggle svg,
.mobile-menu-btn svg {
    width: 20px;
    height: 20px;
    stroke: var(--text-secondary);
    transition: stroke var(--transition), transform var(--transition);
}

.theme-toggle:hover svg {
    transform: rotate(20deg);
}

.mobile-menu-btn {
    display: none;
}

/* --------------------------------------------------------------------------
   5. 面包屑
   -------------------------------------------------------------------------- */
.breadcrumb {
    padding: 14px 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-body);
    transition: background-color var(--transition), border-color var(--transition);
}

.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
}

.breadcrumb li {
    display: flex;
    align-items: center;
    gap: 6px;
}

.breadcrumb li:not(:last-child)::after {
    content: '/';
    color: var(--text-muted);
    opacity: 0.6;
}

.breadcrumb a {
    color: var(--text-secondary);
    transition: color var(--transition);
}

.breadcrumb a:hover {
    color: var(--brand-primary);
}

[data-theme="dark"] .breadcrumb a:hover {
    color: var(--brand-accent-light);
}

/* --------------------------------------------------------------------------
   6. Banner 轮播 - 渐变背景
   -------------------------------------------------------------------------- */
.hero-banner {
    position: relative;
    overflow: hidden;
    background: var(--gradient-hero);
    color: #fff;
    padding: 72px 0 80px;
    min-height: 460px;
    display: flex;
    align-items: center;
}

/* 装饰性光斑 */
.hero-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(249, 115, 22, 0.25) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: floatGlow 12s ease-in-out infinite;
}

.hero-banner::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -5%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: floatGlow 15s ease-in-out infinite reverse;
}

@keyframes floatGlow {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.8;
    }
    50% {
        transform: translate(30px, -30px) scale(1.1);
        opacity: 1;
    }
}

.hero-slides {
    position: relative;
    width: 100%;
    z-index: 2;
}

.hero-slide {
    display: none;
    animation: fadeInUp 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-slide.active {
    display: block;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content {
    max-width: 720px;
}

.hero-content h1 {
    font-size: 2.6rem;
    line-height: 1.25;
    margin-bottom: 18px;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.1rem;
    color: #cbd5e1;
    margin-bottom: 28px;
    max-width: 600px;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-slow);
    border: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.5s ease, height 0.5s ease;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-accent);
    color: #fff;
    box-shadow: 0 4px 14px rgba(249, 115, 22, 0.35);
}

.btn-primary:hover {
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(249, 115, 22, 0.45);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    color: #fff;
    border: 1.5px solid rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(8px);
}

.btn-outline:hover {
    border-color: #fff;
    background-color: rgba(255, 255, 255, 0.12);
    color: #fff;
    transform: translateY(-3px);
}

.btn-outline:active {
    transform: translateY(-1px);
}

/* 轮播指示点 */
.hero-dots {
    position: absolute;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 5;
}

.hero-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.35);
    cursor: pointer;
    transition: background-color var(--transition), transform var(--transition),
        width var(--transition-slow);
    border: none;
    padding: 0;
}

.hero-dot:hover {
    background-color: rgba(255, 255, 255, 0.6);
}

.hero-dot.active {
    background: var(--gradient-accent);
    width: 28px;
    transform: scale(1);
}

/* --------------------------------------------------------------------------
   7. 数字统计
   -------------------------------------------------------------------------- */
.stats-section {
    padding: 48px 0;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    background-image: var(--gradient-surface);
    transition: background-color var(--transition), border-color var(--transition);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 16px;
    border-radius: var(--radius-md);
    transition: transform var(--transition-slow), background-color var(--transition);
}

.stat-item:hover {
    transform: translateY(-4px);
    background-color: var(--bg-card);
    box-shadow: var(--shadow-md);
}

.stat-item h3 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--brand-primary);
    margin-bottom: 4px;
    letter-spacing: -0.02em;
    transition: color var(--transition);
}

[data-theme="dark"] .stat-item h3 {
    color: var(--brand-accent-light);
}

.stat-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   8. 通用区块
   -------------------------------------------------------------------------- */
.section {
    padding: 72px 0;
    transition: background-color var(--transition);
}

.section-alt {
    background-color: var(--bg-surface);
    background-image: var(--gradient-surface);
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 52px;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 14px;
    letter-spacing: -0.01em;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 48px;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
}

.section-header p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 16px;
}

/* --------------------------------------------------------------------------
   9. 品牌介绍
   -------------------------------------------------------------------------- */
.brand-intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.brand-intro-text h2 {
    font-size: 1.8rem;
    margin-bottom: 18px;
    font-weight: 700;
}

.brand-intro-text p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.98rem;
    line-height: 1.85;
}

.brand-intro-visual {
    background: linear-gradient(145deg, var(--brand-primary) 0%, var(--brand-accent) 100%);
    border-radius: var(--radius-lg);
    padding: 40px;
    color: #fff;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.brand-intro-visual:hover {
    transform: translateY(-6px) scale(1.01);
    box-shadow: 0 30px 60px -15px rgba(30, 58, 138, 0.4);
}

.brand-intro-visual::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -20%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.brand-intro-visual svg {
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* --------------------------------------------------------------------------
   10. 产品卡片
   -------------------------------------------------------------------------- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: transform var(--transition-slow), box-shadow var(--transition-slow),
        border-color var(--transition), background-color var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--brand-primary);
}

[data-theme="dark"] .card:hover {
    border-color: var(--brand-accent);
    box-shadow: 0 20px 40px -10px rgba(6, 182, 212, 0.2);
}

.card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    transition: transform var(--transition-slow), background var(--transition);
}

.card:hover .card-icon {
    transform: scale(1.1) rotate(-4deg);
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.15) 0%, rgba(236, 72, 153, 0.15) 100%);
}

.card-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--brand-primary);
    transition: stroke var(--transition);
}

[data-theme="dark"] .card-icon svg {
    stroke: var(--brand-accent-light);
}

.card h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    font-weight: 600;
    transition: color var(--transition);
}

.card:hover h3 {
    color: var(--brand-primary);
}

[data-theme="dark"] .card:hover h3 {
    color: var(--brand-accent-light);
}

.card p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* --------------------------------------------------------------------------
   11. 文章列表
   -------------------------------------------------------------------------- */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 28px;
}

.article-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: transform var(--transition-slow), box-shadow var(--transition-slow),
        border-color var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
}

.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: var(--brand-primary);
}

[data-theme="dark"] .article-card:hover {
    border-color: var(--brand-accent);
}

.article-thumb {
    width: 100%;
    height: 180px;
    background-color: var(--bg-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.article-thumb svg {
    width: 100%;
    height: 100%;
    transition: transform var(--transition-slow);
}

.article-card:hover .article-thumb svg {
    transform: scale(1.08);
}

.article-thumb::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(0, 0, 0, 0.15) 100%);
    opacity: 0;
    transition: opacity var(--transition);
}

.article-card:hover .article-thumb::after {
    opacity: 1;
}

.article-body {
    padding: 22px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.article-meta span {
    display: inline-flex;
    align-items: center;
}

.article-meta span:first-child::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--brand-secondary);
    margin-right: 6px;
}

.article-body h3 {
    font-size: 1.05rem;
    margin-bottom: 10px;
    line-height: 1.45;
    font-weight: 600;
    transition: color var(--transition);
}

.article-card:hover .article-body h3 {
    color: var(--brand-primary);
}

[data-theme="dark"] .article-card:hover .article-body h3 {
    color: var(--brand-accent-light);
}

.article-body p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    flex: 1;
    margin-bottom: 14px;
    line-height: 1.75;
}

.read-more {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--brand-primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--transition), color var(--transition);
    align-self: flex-start;
}

.read-more:hover {
    gap: 10px;
    color: var(--brand-secondary);
}

[data-theme="dark"] .read-more {
    color: var(--brand-accent-light);
}

[data-theme="dark"] .read-more:hover {
    color: var(--brand-secondary);
}

/* --------------------------------------------------------------------------
   12. FAQ 手风琴
   -------------------------------------------------------------------------- */
.faq-list {
    max-width: 860px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    overflow: hidden;
    background-color: var(--bg-card);
    transition: border-color var(--transition), box-shadow var(--transition),
        background-color var(--transition);
}

.faq-item:hover {
    border-color: var(--brand-primary);
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .faq-item:hover {
    border-color: var(--brand-accent);
}

.faq-item.open {
    border-color: var(--brand-primary);
    box-shadow: var(--shadow-md);
}

[data-theme="dark"] .faq-item.open {
    border-color: var(--brand-accent);
}

.faq-question {
    width: 100%;
    text-align: left;
    padding: 18px 22px;
    font-size: 1rem;
    font-weight: 600;
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    transition: background-color var(--transition), color var(--transition);
}

.faq-question:hover {
    background-color: var(--bg-surface);
    color: var(--brand-primary);
}

[data-theme="dark"] .faq-question:hover {
    color: var(--brand-accent-light);
}

.faq-question span {
    flex: 1;
    line-height: 1.5;
}

.faq-question svg {
    width: 20px;
    height: 20px;
    stroke: var(--text-muted);
    transition: transform var(--transition-slow), stroke var(--transition);
    flex-shrink: 0;
}

.faq-item.open .faq-question svg {
    transform: rotate(180deg);
    stroke: var(--brand-secondary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1),
        padding 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    padding: 0 22px;
    color: var(--text-secondary);
    font-size: 0.94rem;
    line-height: 1.8;
}

.faq-item.open .faq-answer {
    max-height: 600px;
    padding: 0 22px 20px;
}

/* --------------------------------------------------------------------------
   13. HowTo 步骤
   -------------------------------------------------------------------------- */
.howto-steps {
    display: grid;
    gap: 20px;
    max-width: 860px;
    margin: 0 auto;
}

.howto-step {
    display: flex;
    gap: 20px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: transform var(--transition-slow), box-shadow var(--transition-slow),
        border-color var(--transition);
    position: relative;
    overflow: hidden;
}

.howto-step::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-accent);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--transition-slow);
}

.howto-step:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--brand-primary);
}

[data-theme="dark"] .howto-step:hover {
    border-color: var(--brand-accent);
}

.howto-step:hover::before {
    transform: scaleY(1);
}

.step-num {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-brand);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
    font-size: 0.95rem;
    transition: transform var(--transition-slow), box-shadow var(--transition);
    box-shadow: 0 4px 10px rgba(30, 58, 138, 0.25);
}

.howto-step:hover .step-num {
    transform: scale(1.1) rotate(-6deg);
    box-shadow: 0 6px 16px rgba(249, 115, 22, 0.35);
    background: var(--gradient-accent);
}

.howto-step h4 {
    margin-bottom: 6px;
    font-size: 1rem;
    font-weight: 600;
    transition: color var(--transition);
}

.howto-step:hover h4 {
    color: var(--brand-primary);
}

[data-theme="dark"] .howto-step:hover h4 {
    color: var(--brand-accent-light);
}

.howto-step p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* --------------------------------------------------------------------------
   14. 联系我们
   -------------------------------------------------------------------------- */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    padding: 20px;
    border-radius: var(--radius-md);
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-slow), box-shadow var(--transition-slow),
        border-color var(--transition);
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--brand-primary);
}

[data-theme="dark"] .contact-item:hover {
    border-color: var(--brand-accent);
}

.contact-item svg {
    width: 22px;
    height: 22px;
    stroke: var(--brand-primary);
    flex-shrink: 0;
    margin-top: 3px;
    transition: stroke var(--transition), transform var(--transition-slow);
}

[data-theme="dark"] .contact-item svg {
    stroke: var(--brand-accent-light);
}

.contact-item:hover svg {
    stroke: var(--brand-secondary);
    transform: scale(1.15);
}

.contact-item h4 {
    font-size: 0.95rem;
    margin-bottom: 4px;
    font-weight: 600;
}

.contact-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --------------------------------------------------------------------------
   15. 页脚
   -------------------------------------------------------------------------- */
.site-footer {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 56px 0 24px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: background-color var(--transition), border-color var(--transition);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 36px;
}

.footer-col h4 {
    font-size: 0.95rem;
    margin-bottom: 16px;
    color: var(--text-primary);
    font-weight: 600;
    position: relative;
    padding-bottom: 8px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: var(--text-secondary);
    font-size: 0.86rem;
    transition: color var(--transition), padding-left var(--transition);
    display: inline-block;
}

.footer-col ul li a:hover {
    color: var(--brand-primary);
    padding-left: 4px;
}

[data-theme="dark"] .footer-col ul li a:hover {
    color: var(--brand-accent-light);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.footer-bottom a {
    color: var(--text-muted);
    transition: color var(--transition);
}

.footer-bottom a:hover {
    color: var(--brand-primary);
}

[data-theme="dark"] .footer-bottom a:hover {
    color: var(--brand-accent-light);
}

/* --------------------------------------------------------------------------
   16. 返回顶部
   -------------------------------------------------------------------------- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--gradient-brand);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px) scale(0.9);
    transition: all var(--transition-slow);
    z-index: 900;
    box-shadow: var(--shadow-lg);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.back-to-top:hover {
    background: var(--gradient-accent);
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 12px 28px rgba(249, 115, 22, 0.4);
}

.back-to-top:active {
    transform: translateY(-2px) scale(0.98);
}

.back-to-top svg {
    width: 22px;
    height: 22px;
    stroke: #fff;
}

/* --------------------------------------------------------------------------
   17. 滚动动画
   -------------------------------------------------------------------------- */
.fade-up {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-up.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* 错开动画延迟 */
.fade-up:nth-child(1) { transition-delay: 0s; }
.fade-up:nth-child(2) { transition-delay: 0.08s; }
.fade-up:nth-child(3) { transition-delay: 0.16s; }
.fade-up:nth-child(4) { transition-delay: 0.24s; }
.fade-up:nth-child(5) { transition-delay: 0.32s; }
.fade-up:nth-child(6) { transition-delay: 0.4s; }

/* --------------------------------------------------------------------------
   18. 移动端菜单
   -------------------------------------------------------------------------- */
.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    z-index: 999;
    padding: 24px;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.mobile-nav a {
    display: block;
    padding: 14px 0;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: color var(--transition), padding-left var(--transition);
}

.mobile-nav a:hover {
    color: var(--brand-primary);
    padding-left: 8px;
}

[data-theme="dark"] .mobile-nav a:hover {
    color: var(--brand-accent-light);
}

/* --------------------------------------------------------------------------
   19. 响应式设计
   -------------------------------------------------------------------------- */

/* 大屏平板 */
@media (max-width: 1024px) {
    .nav-links {
        display: none;
    }

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

    .mobile-nav {
        display: block;
    }

    .brand-intro-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .hero-content h1 {
        font-size: 2.2rem;
    }
}

/* 平板 */
@media (max-width: 768px) {
    .hero-banner {
        padding: 56px 0 72px;
        min-height: 400px;
    }

    .hero-content h1 {
        font-size: 1.9rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .section {
        padding: 56px 0;
    }

    .section-header h2 {
        font-size: 1.7rem;
    }

    .article-list {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

/* 手机 */
@media (max-width: 640px) {
    .container {
        padding: 0 16px;
    }

    .header-inner {
        gap: 8px;
    }

    .logo {
        font-size: 1.15rem;
    }

    .logo svg {
        width: 30px;
        height: 30px;
    }

    .hero-banner {
        padding: 40px 0 64px;
        min-height: 360px;
    }

    .hero-content h1 {
        font-size: 1.6rem;
        line-height: 1.3;
    }

    .hero-content p {
        font-size: 0.95rem;
        margin-bottom: 22px;
    }

    .hero-cta {
        gap: 10px;
    }

    .btn {
        padding: 10px 22px;
        font-size: 0.9rem;
    }

    .search-box {
        display: none;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .stat-item {
        padding: 12px 8px;
    }

    .stat-item h3 {
        font-size: 1.5rem;
    }

    .stat-item p {
        font-size: 0.8rem;
    }

    .section {
        padding: 44px 0;
    }

    .section-header {
        margin-bottom: 36px;
    }

    .section-header h2 {
        font-size: 1.4rem;
    }

    .section-header p {
        font-size: 0.92rem;
    }

    .brand-intro-text h2 {
        font-size: 1.5rem;
    }

    .brand-intro-visual {
        padding: 28px;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .card {
        padding: 22px;
    }

    .article-list {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .article-thumb {
        height: 160px;
    }

    .howto-step {
        flex-direction: column;
        gap: 12px;
        padding: 20px;
    }

    .howto-step:hover {
        transform: translateY(-4px);
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .contact-item {
        padding: 16px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }

    .faq-question {
        padding: 16px 18px;
        font-size: 0.95rem;
    }

    .faq-answer {
        padding: 0 18px;
        font-size: 0.9rem;
    }

    .faq-item.open .faq-answer {
        padding: 0 18px 18px;
    }
}

/* 超小屏 */
@media (max-width: 380px) {
    .hero-content h1 {
        font-size: 1.4rem;
    }

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

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }
}

/* --------------------------------------------------------------------------
   20. 无障碍与动效偏好
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .fade-up {
        opacity: 1;
        transform: none;
    }
}

/* 焦点可见性 */
:focus-visible {
    outline: 2px solid var(--brand-secondary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* 打印样式 */
@media print {
    .site-header,
    .mobile-nav,
    .back-to-top,
    .hero-dots,
    .search-box {
        display: none !important;
    }

    body {
        color: #000;
        background: #fff;
    }

    .card,
    .article-card,
    .faq-item,
    .howto-step {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}
```