```css
/* ===== 51爆料 - 完整样式表 ===== */
/* 作者：资深UI设计师 | 版本：1.0 | 最后更新：2025 */

/* ---------- CSS变量 / 主题令牌 ---------- */
:root {
    /* 主色板 - 深蓝 + 金色点缀 */
    --primary: #1e3a5f;
    --primary-light: #3b5f9e;
    --primary-dark: #0b2b44;
    --accent: #f5a623;
    --accent-light: #ffb347;
    --accent-dark: #d4891a;
    
    /* 中性色 */
    --bg: #f0f4f8;
    --bg-card: #ffffff;
    --bg-soft: #e8eef5;
    --text-primary: #1f2937;
    --text-secondary: #4a5a6a;
    --text-heading: #0b1e33;
    --text-link: #1d4ed8;
    --text-link-hover: #1e40af;
    --border: #d1d9e6;
    --border-light: #e2e8f0;
    
    /* 功能色 */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow: 0 4px 16px rgba(0,0,0,0.07);
    --shadow-md: 0 6px 24px rgba(0,0,0,0.10);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    
    /* 渐变 */
    --hero-gradient: linear-gradient(135deg, #0b2b44 0%, #1e4a6f 50%, #2d6a8f 100%);
    --card-gradient: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    --accent-gradient: linear-gradient(135deg, #f5a623 0%, #ffb347 100%);
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius: 14px;
    --radius-md: 18px;
    --radius-lg: 24px;
    --radius-full: 50px;
    
    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    
    /* 字体 */
    --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-serif: 'Georgia', 'Times New Roman', serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;
    
    /* 毛玻璃效果 */
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --glass-blur: 12px;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 暗色模式变量覆盖 */
    --dark-bg: #0b1220;
    --dark-bg-card: #16213a;
    --dark-bg-soft: #1e2a44;
    --dark-text-primary: #e2e8f0;
    --dark-text-secondary: #cbd5e1;
    --dark-text-heading: #f8fafc;
    --dark-text-link: #7aa7ff;
    --dark-border: #2a3b5a;
    --dark-border-light: #334155;
    --dark-nav-bg: rgba(16, 27, 46, 0.85);
    --dark-glass-bg: rgba(22, 33, 58, 0.72);
}

/* 暗色模式 */
[data-theme="dark"] {
    --bg: var(--dark-bg);
    --bg-card: var(--dark-bg-card);
    --bg-soft: var(--dark-bg-soft);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --text-heading: var(--dark-text-heading);
    --text-link: var(--dark-text-link);
    --text-link-hover: #93c5fd;
    --border: var(--dark-border);
    --border-light: var(--dark-border-light);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-md: 0 6px 24px rgba(0,0,0,0.5);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.6);
    --glass-bg: var(--dark-glass-bg);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    --card-gradient: linear-gradient(145deg, #16213a 0%, #1a2744 100%);
    --hero-gradient: linear-gradient(135deg, #0a1628 0%, #132c44 60%, #1a3a5c 100%);
    --accent-gradient: linear-gradient(135deg, #d4891a 0%, #f5a623 100%);
    color-scheme: dark;
}

/* ---------- 基础重置与全局设置 ---------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    font-size: 16px;
}

body {
    background-color: var(--bg);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.75;
    font-weight: 400;
    transition: background-color var(--transition), color var(--transition);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-soft);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 10px;
    border: 2px solid var(--bg-soft);
}

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

/* 选中文本样式 */
::selection {
    background-color: var(--accent);
    color: #ffffff;
}

/* 可访问性 */
:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}

/* 图片自适应 */
img,
svg {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 链接基础 */
a {
    color: var(--text-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--text-link-hover);
    text-decoration: underline;
}

/* 标题设置 */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-heading);
    font-weight: 650;
    line-height: 1.3;
    margin: 0 0 0.5em;
    letter-spacing: -0.01em;
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    font-weight: 650;
    margin-top: var(--space-lg);
    position: relative;
    padding-bottom: 0.35em;
}

/* 标题装饰线 */
section h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 60px;
    height: 4px;
    background: var(--accent-gradient);
    border-radius: 4px;
}

h3 {
    font-size: clamp(1.2rem, 2.5vw, 1.5rem);
    font-weight: 600;
}

h4 {
    font-size: clamp(1rem, 2vw, 1.2rem);
    font-weight: 600;
}

p {
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

/* 列表 */
ul, ol {
    padding-left: 1.5rem;
    margin-bottom: var(--space-md);
}

li {
    margin-bottom: 0.4em;
}

/* 引用 */
blockquote {
    border-left: 4px solid var(--accent);
    background: var(--bg-soft);
    padding: var(--space-sm) var(--space-md);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-style: italic;
    margin: var(--space-md) 0;
}

/* 表格 */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: var(--space-lg) 0;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-light);
}

th, td {
    padding: 0.9rem 1.2rem;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

th {
    background-color: var(--primary);
    color: #ffffff;
    font-weight: 600;
    letter-spacing: 0.02em;
}

tr:last-child td {
    border-bottom: none;
}

/* 交替行颜色 */
tbody tr:nth-child(even) {
    background-color: var(--bg-soft);
}

/* 容器 */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* ---------- 导航栏 ---------- */
.navbar {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--glass-shadow);
    transition: all var(--transition);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 0;
    gap: 1rem;
}

.logo {
    font-size: 1.9rem;
    font-weight: 800;
    color: var(--text-heading);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 0.1em;
    line-height: 1;
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.logo:hover {
    text-decoration: none;
    transform: scale(1.02);
}

.logo span {
    color: var(--accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    list-style: none;
}

.nav-links a {
    color: var(--text-primary);
    font-weight: 500;
    padding: 0.5rem 0.9rem;
    border-radius: var(--radius-full);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    font-size: 0.95rem;
}

.nav-links a:hover {
    background: var(--bg-soft);
    color: var(--primary);
    text-decoration: none;
}

/* 导航CTA按钮 */
.nav-links .btn-nav {
    background: var(--primary);
    color: #ffffff;
    padding: 0.5rem 1.2rem;
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: all var(--transition-fast);
    border: none;
    cursor: pointer;
}

.nav-links .btn-nav:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* 暗色模式切换按钮 */
.dark-toggle {
    background: var(--bg-soft);
    border: none;
    border-radius: var(--radius-full);
    padding: 0.5rem 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
}

.dark-toggle:hover {
    background: var(--border);
    transform: scale(1.03);
}

/* 汉堡菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--text-heading);
    cursor: pointer;
    line-height: 1;
    padding: 0.2rem;
}

/* 移动端导航 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        padding: 1rem 0;
        gap: 0.2rem;
        background: var(--glass-bg);
        backdrop-filter: blur(var(--glass-blur));
        border-radius: var(--radius);
        border: 1px solid var(--glass-border);
        box-shadow: var(--glass-shadow);
        position: absolute;
        top: 100%;
        left: 20px;
        right: 20px;
    }
    
    .nav-links.show {
        display: flex;
        animation: slideDown 0.3s ease;
    }
    
    .nav-links a {
        width: 100%;
        padding: 0.6rem 1rem;
    }
    
    .nav-links .btn-nav {
        width: 100%;
        text-align: center;
        margin-top: 0.5rem;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .nav-inner {
        flex-wrap: wrap;
    }
}

/* 下拉动画 */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
    padding: 1rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: transparent;
}

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

.breadcrumb a:hover {
    color: var(--text-link-hover);
}

/* ---------- Hero区 ---------- */
.hero {
    background: var(--hero-gradient);
    padding: clamp(3rem, 8vw, 5rem) 0;
    border-radius: 0 0 48px 48px;
    position: relative;
    overflow: hidden;
    color: #ffffff;
    margin-bottom: var(--space-lg);
}

/* 装饰性背景形状 */
.hero::before {
    content: '';
    position: absolute;
    top: -60%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: 10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(245,166,35,0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero h1 {
    color: #ffffff;
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    margin-bottom: 0.6em;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    font-weight: 800;
}

.hero p {
    color: rgba(255, 255, 255, 0.95);
    font-size: clamp(1rem, 2vw, 1.25rem);
    max-width: 700px;
    margin-bottom: 1.5em;
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.2);
}

.hero .btn {
    background: var(--accent-gradient);
    color: #1a1a1a;
    border: none;
    font-weight: 600;
    padding: 0.8rem 2rem;
    border-radius: var(--radius-full);
    box-shadow: 0 4px 16px rgba(245, 166, 35, 0.3);
    transition: all var(--transition);
    display: inline-block;
    cursor: pointer;
    font-size: 1rem;
}

.hero .btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 24px rgba(245, 166, 35, 0.4);
    filter: brightness(0.95);
}

/* ---------- 按钮通用 ---------- */
.btn {
    background-color: var(--primary);
    color: #ffffff;
    padding: 0.7rem 1.8rem;
    border-radius: var(--radius-full);
    font-weight: 500;
    border: none;
    transition: all var(--transition);
    display: inline-block;
    cursor: pointer;
    font-size: 0.95rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.btn:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
    text-decoration: none;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-accent {
    background: var(--accent-gradient);
    color: #1a1a1a;
}

.btn-accent:hover {
    filter: brightness(0.95);
    transform: translateY(-2px);
}

/* ---------- 内容区块 ---------- */
.content-section {
    background: var(--bg-card);
    padding: clamp(1.5rem, 4vw, 2.5rem);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin: var(--space-lg) 0;
    border: 1px solid var(--border-light);
    transition: transform var(--transition), box-shadow var(--transition);
}

.content-section:hover {
    box-shadow: var(--shadow-md);
}

/* 卡片网格 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin: var(--space-lg) 0;
}

/* 卡片样式 */
.card {
    background: var(--card-gradient);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow);
    transition: all var(--transition);
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition);
}

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

.card:hover::before {
    opacity: 1;
}

.card h3,
.card h4 {
    margin-top: 0;
    margin-bottom: 0.6em;
    font-size: 1.2rem;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex-grow: 1;
}

.card .meta {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: auto;
    padding-top: var(--space-sm);
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 图标卡片 */
.card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
    display: block;
}

/* 数据卡片 */
.stat-card {
    text-align: center;
    padding: var(--space-lg) var(--space-md);
}

.stat-number {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    display: block;
    margin-bottom: 0.2em;
}

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

/* 客户评价卡片 */
.testimonial-card {
    background: var(--bg-soft);
    border-radius: var(--radius);
    padding: var(--space-lg);
    border-left: 4px solid var(--accent);
    margin-bottom: var(--space-md);
}

.testimonial-card p {
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.testimonial-author {
    font-weight: 600;
    color: var(--primary);
    font-size: 0.9rem;
}

/* 文章列表 */
.article-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.article-list li {
    padding: 0.9rem 0;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    transition: all var(--transition-fast);
}

.article-list li:last-child {
    border-bottom: none;
}

.article-list li:hover {
    padding-left: 0.5rem;
    background: var(--bg-soft);
}

.article-list a {
    font-weight: 500;
    color: var(--text-primary);
    transition: color var(--transition-fast);
    flex: 1;
}

.article-list a:hover {
    color: var(--primary);
    text-decoration: none;
}

.article-date {
    color: var(--text-secondary);
    font-size: 0.85rem;
    white-space: nowrap;
}

/* ---------- FAQ样式 ---------- */
.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius);
    margin-bottom: 0.8rem;
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: all var(--transition-fast);
}

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

.faq-question {
    font-weight: 600;
    font-size: 1.05rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.2rem;
    color: var(--text-heading);
    background: var(--bg-soft);
    transition: background-color var(--transition-fast);
    gap: 1rem;
}

.faq-question:hover {
    background: var(--border-light);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 400;
    transition: transform var(--transition);
    color: var(--primary);
    line-height: 1;
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.2rem 1rem;
    color: var(--text-primary);
    border-top: 1px solid var(--border-light);
    padding-top: 0.9rem;
    margin-top: 0;
    line-height: 1.7;
}

/* 初始隐藏FAQ答案 */
.faq-answer {
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------- 页脚 ---------- */
.site-footer {
    background: var(--primary-dark);
    color: var(--text-footer);
    margin-top: var(--space-xl);
    padding: var(--space-xl) 0 var(--space-md);
    position: relative;
}

.site-footer a {
    color: #b6c8e0;
    transition: color var(--transition-fast);
}

.site-footer a:hover {
    color: var(--accent);
    text-decoration: none;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.site-footer h4 {
    color: #d1e0f5;
    margin-bottom: var(--space-sm);
    font-size: 1.1rem;
}

.site-footer p {
    color: #b6c8e0;
    font-size: 0.95rem;
}

.site-footer ul {
    list-style: none;
    padding: 0;
}

.site-footer ul li {
    margin-bottom: 0.5rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    text-align: center;
    color: #b0c4db;
    font-size: 0.9rem;
}

.footer-bottom p {
    color: #b0c4db;
    margin-bottom: 0;
}

/* 友情链接 */
.footer-links a {
    margin-right: 0.5rem;
    display: inline-block;
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--primary);
    color: #ffffff;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: none;
    font-size: 1.5rem;
    box-shadow: var(--shadow-md);
    z-index: 999;
    transition: all var(--transition);
}

.back-to-top:hover {
    background: var(--accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ---------- 滚动动画 ---------- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 延迟动画 */
.reveal.delay-1 {
    transition-delay: 0.1s;
}

.reveal.delay-2 {
    transition-delay: 0.2s;
}

.reveal.delay-3 {
    transition-delay: 0.3s;
}

/* ---------- 图片占位 ---------- */
.svg-placeholder {
    background-color: var(--bg-soft);
    border-radius: var(--radius);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 160px;
    color: var(--text-secondary);
    border: 1px dashed var(--border);
    width: 100%;
}

/* ---------- 响应式设计 ---------- */
@media (max-width: 1024px) {
    .container {
        padding: 0 16px;
    }
    
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: var(--space-md);
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .container {
        padding: 0 14px;
    }
    
    .nav-inner {
        padding: 0.6rem 0;
    }
    
    .logo {
        font-size: 1.6rem;
    }
    
    .content-section {
        padding: 1.2rem;
        border-radius: var(--radius-md);
    }
    
    .card-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .article-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.2rem;
    }
    
    .article-date {
        margin-left: 0;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .back-to-top {
        bottom: 1.2rem;
        right: 1.2rem;
        width: 42px;
        height: 42px;
        font-size: 1.2rem;
    }
    
    .hero {
        border-radius: 0 0 32px 32px;
    }
    
    table {
        font-size: 0.9rem;
    }
    
    th, td {
        padding: 0.7rem 0.8rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding: 0 12px;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 0.95rem;
    }
    
    .card {
        padding: var(--space-md);
    }
    
    .faq-question {
        font-size: 0.95rem;
        padding: 0.8rem 1rem;
    }
    
    .faq-answer {
        padding: 0 1rem 0.8rem;
    }
    
    .btn {
        padding: 0.6rem 1.4rem;
        font-size: 0.9rem;
    }
}

/* ---------- 工具类 ---------- */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-secondary);
}

.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }

.flex {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* 隐藏 */
.hidden {
    display: none !important;
}

/* 无障碍 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ---------- 动画效果 ---------- */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

/* 加载骨架屏 */
.skeleton {
    background: linear-gradient(90deg, var(--bg-soft) 25%, var(--border-light) 37%, var(--bg-soft) 63%);
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
    border-radius: var(--radius);
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ---------- 打印样式 ---------- */
@media print {
    .navbar,
    .back-to-top,
    .hero .btn {
        display: none !important;
    }
    
    body {
        background: #ffffff;
        color: #000000;
    }
    
    .content-section {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}
```