```css

/* ========== 全局重置与颜色系统 (高可读性优先) ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background-color: #f8fafc;
    color: #1e293b; /* 深灰蓝，主正文高对比 */
    line-height: 1.7;
    transition: background 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 深色模式变量 */
:root {
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-alt: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #334155;
    --text-tertiary: #475569;
    --heading: #0f172a;
    --border: #cbd5e1;
    --brand: #b45309;
    --brand-dark: #92400e;
    --brand-light: #f59e0b;
    --link: #1d4ed8;
    --nav-bg: rgba(255,255,255,0.85);
    --footer-bg: #0f172a;
    --footer-text: #e2e8f0;
    --shadow: 0 4px 12px rgba(0,0,0,0.05);
    --shadow-hover: 0 12px 32px rgba(0,0,0,0.1);
    --hero-gradient: linear-gradient(135deg, #fef3c7 0%, #fde68a 50%, #fcd34d 100%);
    --card-hover-transform: translateY(-6px);
}

body.dark {
    --bg: #12171f;
    --surface: #1e293b;
    --surface-alt: #0f172a;
    --text-primary: #e2e8f0;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --heading: #f1f5f9;
    --border: #334155;
    --brand: #fbbf24;
    --brand-dark: #f59e0b;
    --brand-light: #fde68a;
    --link: #93c5fd;
    --nav-bg: rgba(15,23,42,0.9);
    --footer-bg: #0b111e;
    --footer-text: #cbd5e1;
    --shadow: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-hover: 0 12px 32px rgba(0,0,0,0.5);
    --hero-gradient: linear-gradient(135deg, #1e293b 0%, #0f172a 50%, #1e1b4b 100%);
}

/* 基础元素 */
h1, h2, h3, h4 { color: var(--heading); font-weight: 700; line-height: 1.3; }
p { color: var(--text-primary); }
a { color: var(--link); text-decoration: none; transition: color 0.2s ease; }
a:hover { text-decoration: underline; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* 滚动条 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--brand); }

/* 导航 */
.site-header {
    position: sticky; top: 0; z-index: 50;
    background: var(--nav-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(203, 213, 225, 0.3);
    box-shadow: 0 1px 20px rgba(0,0,0,0.05);
}

.nav-wrap { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 1rem; }

.logo a {
    font-size: 1.8rem; font-weight: 800; color: var(--brand-dark);
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--brand-dark), var(--brand-light));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: opacity 0.2s;
}
.logo a:hover { opacity: 0.8; text-decoration: none; }

body.dark .logo a { background: linear-gradient(135deg, var(--brand), var(--brand-light)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

.nav-links { display: flex; gap: 2rem; }
.nav-links a {
    font-weight: 500; color: var(--text-primary);
    padding: 0.5rem 0; border-bottom: 2px solid transparent;
    position: relative; transition: color 0.2s, border-color 0.2s;
}
.nav-links a::after {
    content: '';
    position: absolute; bottom: -2px; left: 0;
    width: 0; height: 2px;
    background: var(--brand);
    transition: width 0.3s ease;
}
.nav-links a:hover { color: var(--brand-dark); text-decoration: none; }
.nav-links a:hover::after { width: 100%; }
body.dark .nav-links a:hover { color: var(--brand); }

.nav-actions { display: flex; align-items: center; gap: 0.8rem; }

.search-box {
    display: flex; align-items: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 50px;
    padding: 0.3rem 0.3rem 0.3rem 1rem;
    transition: box-shadow 0.2s, border-color 0.2s;
    backdrop-filter: blur(10px);
}
.search-box:focus-within { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(180, 83, 9, 0.1); }
.search-box input {
    border: none; background: transparent; color: var(--text-primary);
    padding: 0.4rem 0.6rem; width: 160px; outline: none;
    font-size: 0.95rem;
}
.search-box input::placeholder { color: var(--text-tertiary); }
.search-box button {
    background: var(--brand-dark); border: none; color: #fff;
    font-size: 1rem; cursor: pointer;
    width: 36px; height: 36px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    transition: background 0.2s, transform 0.2s;
}
.search-box button:hover { background: var(--brand); transform: scale(1.05); }
body.dark .search-box button { background: var(--brand); color: #0f172a; }

.theme-toggle {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 42px; height: 42px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; font-size: 1.2rem;
    color: var(--text-primary);
    transition: transform 0.2s, background 0.2s, border-color 0.2s;
    backdrop-filter: blur(10px);
}
.theme-toggle:hover { transform: rotate(20deg); border-color: var(--brand); }

.mobile-menu-btn {
    display: none; background: none; border: none;
    font-size: 1.8rem; color: var(--text-primary); cursor: pointer;
    width: 42px; height: 42px;
    border-radius: 50%;
    transition: background 0.2s;
}
.mobile-menu-btn:hover { background: var(--surface-alt); }

/* 移动菜单 */
@media (max-width: 900px) {
    .nav-links, .search-box { display: none; }
    .mobile-menu-btn { display: flex; align-items: center; justify-content: center; }
    .mobile-nav-open .nav-links {
        display: flex; flex-direction: column;
        position: absolute; top: 72px; left: 0; right: 0;
        background: var(--nav-bg);
        backdrop-filter: blur(20px);
        padding: 1.5rem 2rem;
        box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border);
        gap: 0.8rem;
        animation: slideDown 0.3s ease;
    }
    .mobile-nav-open .search-box {
        display: flex;
        margin-top: 1rem;
        position: absolute; top: 100%; left: 1rem; right: 1rem;
        z-index: 60;
        background: var(--surface);
    }
    .mobile-nav-open .search-box input { width: 100%; }
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 按钮通用 */
.btn-primary {
    background: linear-gradient(135deg, var(--brand-dark), var(--brand-light));
    border: none; color: #fff;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 600; font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    display: inline-block;
    box-shadow: 0 4px 15px rgba(180, 83, 9, 0.3);
    text-align: center;
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(180, 83, 9, 0.4);
    text-decoration: none;
    color: #fff;
}
body.dark .btn-primary { background: linear-gradient(135deg, var(--brand), var(--brand-light)); color: #0f172a; box-shadow: 0 4px 15px rgba(251, 191, 36, 0.3); }

/* Hero Banner */
.hero {
    background: var(--hero-gradient);
    padding: 4rem 0;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%; right: -20%;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
}
.hero::after {
    content: '';
    position: absolute;
    bottom: -30%; left: -10%;
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1.2rem;
    line-height: 1.2;
    letter-spacing: -1px;
    background: linear-gradient(135deg, var(--heading), var(--brand-dark));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
body.dark .hero h1 { background: linear-gradient(135deg, var(--heading), var(--brand)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.3);
    color: var(--text-primary);
    padding: 0.4rem 1.2rem;
    border-radius: 50px;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
}
body.dark .hero-badge { background: rgba(255,255,255,0.1); color: var(--text-primary); }

.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-cta a:last-child {
    align-self: center;
    font-weight: 600;
    color: var(--text-primary);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    transition: color 0.2s, transform 0.2s;
}
.hero-cta a:last-child:hover { color: var(--brand-dark); transform: translateX(5px); text-decoration: none; }

.hero-media {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 24px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 20px 60px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}
.hero-media:hover { transform: scale(1.02); }
.hero-svg { width: 100%; max-width: 400px; border-radius: 16px; }

@media (max-width: 800px) {
    .hero { padding: 3rem 0; }
    .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
    .hero h1 { font-size: 2.2rem; }
}

/* 卡片区 */
.section {
    padding: 4.5rem 0;
    border-bottom: 1px solid var(--border);
    position: relative;
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 1rem;
    letter-spacing: -0.5px;
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 80px; height: 4px;
    background: linear-gradient(90deg, var(--brand), var(--brand-light));
    border-radius: 4px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.8rem;
    margin-top: 2.5rem;
}

.card {
    background: var(--surface);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(203, 213, 225, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}
.card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: linear-gradient(90deg, var(--brand), var(--brand-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}
.card:hover {
    transform: var(--card-hover-transform);
    box-shadow: var(--shadow-hover);
    border-color: var(--brand);
}
.card:hover::before { transform: scaleX(1); }

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    font-weight: 700;
}
.card p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 1rem; }
.card a {
    color: var(--brand-dark);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    transition: gap 0.2s;
}
.card a:hover { gap: 0.6rem; text-decoration: none; }
body.dark .card a { color: var(--brand); }

/* 双栏布局 */
.split-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
    align-items: start;
}
@media (max-width: 800px) {
    .split-grid { grid-template-columns: 1fr; }
}

/* 数据面板 */
.data-panel {
    background: var(--surface);
    padding: 2rem;
    border-radius: 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}
.data-panel:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }

.stat-line {
    display: flex;
    justify-content: space-between;
    padding: 0.8rem 0;
    border-bottom: 1px dashed var(--border);
}
.stat-line:last-child { border-bottom: none; }
.stat-line strong { color: var(--heading); }

.chip-group { display: flex; gap: 0.8rem; flex-wrap: wrap; margin-top: 1.2rem; }
.chip {
    background: var(--brand-light);
    padding: 0.3rem 1.2rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    border: 1px solid transparent;
    transition: all 0.2s;
}
.chip:hover { transform: scale(1.05); }
.chip-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

/* 文章列表 */
.article-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.8rem;
    margin-top: 2.5rem;
}
@media (max-width: 700px) { .article-list { grid-template-columns: 1fr; } }

.article-item {
    background: var(--surface);
    padding: 1.5rem 2rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}
.article-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.article-item h3 { font-size: 1.2rem; margin-bottom: 0.5rem; transition: color 0.2s; }
.article-item:hover h3 { color: var(--brand-dark); }
body.dark .article-item:hover h3 { color: var(--brand); }
.article-meta { color: var(--text-tertiary); font-size: 0.85rem; margin: 0.4rem 0; display: flex; gap: 1rem; align-items: center; }
.article-item p { color: var(--text-secondary); margin-bottom: 0.5rem; }
.article-item a { font-weight: 600; }

/* FAQ */
.faq-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    overflow: hidden;
}
.faq-item:hover { border-color: var(--brand); box-shadow: var(--shadow); }
.faq-question {
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--heading);
    font-size: 1.1rem;
    user-select: none;
    padding: 0.5rem 0;
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease, opacity 0.3s;
    color: var(--text-primary);
    opacity: 0;
    line-height: 1.8;
}
.faq-item.active {
    border-color: var(--brand);
    box-shadow: 0 4px 20px rgba(180, 83, 9, 0.08);
}
.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0.8rem 0 0.5rem;
    opacity: 1;
}
.faq-icon {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--brand-dark);
    transition: transform 0.3s;
    flex-shrink: 0;
    margin-left: 1rem;
}
.faq-item.active .faq-icon { transform: rotate(45deg); }
body.dark .faq-icon { color: var(--brand); }

/* 表格 */
.info-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--surface);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border);
}
.info-table th, .info-table td {
    padding: 1rem 1.2rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}
.info-table th {
    background: var(--surface-alt);
    color: var(--heading);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.info-table tr:last-child td { border-bottom: none; }
.info-table tr:hover td { background: var(--surface-alt); }

/* Footer */
.site-footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 3.5rem 0 2rem;
    margin-top: 2rem;
    position: relative;
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}
.site-footer h4 {
    color: #fff;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}
.site-footer a { color: #cbd5e1; transition: color 0.2s, padding-left 0.2s; }
.site-footer a:hover { color: #fff; padding-left: 3px; text-decoration: none; }
.footer-bottom {
    border-top: 1px solid rgba(148, 163, 184, 0.2);
    margin-top: 2rem;
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
    color: #94a3b8;
}
.footer-bottom p { color: #94a3b8; margin-bottom: 0.5rem; }

/* 其他 */
.breadcrumb {
    display: flex;
    gap: 0.6rem;
    padding: 1.5rem 0 0;
    color: var(--text-tertiary);
    font-size: 0.9rem;
}
.breadcrumb span:not(:last-child)::after {
    content: '›';
    margin-left: 0.6rem;
    color: var(--border);
}
.breadcrumb span:last-child { color: var(--brand-dark); font-weight: 500; }

.howto-box {
    background: var(--surface);
    border-left: 6px solid var(--brand);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    margin-top: 2rem;
    transition: transform 0.3s, box-shadow 0.3s;
}
.howto-box:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.howto-box h3 { margin-bottom: 1.5rem; font-size: 1.4rem; }
.step {
    margin-bottom: 1.2rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.8;
}
.step::before {
    content: '◆';
    position: absolute;
    left: 0;
    color: var(--brand);
    font-size: 0.8rem;
    top: 0.3rem;
}
.step strong { color: var(--heading); }
.step:last-child { margin-bottom: 0; }

.back-to-top {
    position: fixed;
    bottom: 30px; right: 30px;
    background: linear-gradient(135deg, var(--brand-dark), var(--brand-light));
    color: white;
    width: 50px; height: 50px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    border: none;
    font-size: 1.5rem;
    box-shadow: 0 8px 25px rgba(180, 83, 9, 0.3);
    z-index: 99;
    transition: transform 0.3s, box-shadow 0.3s;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}
.back-to-top:hover { transform: translateY(-5px) scale(1.05); box-shadow: 0 12px 35px rgba(180, 83, 9, 0.4); }
body.dark .back-to-top { background: linear-gradient(135deg, var(--brand), var(--brand-light)); color: #0f172a; box-shadow: 0 8px 25px rgba(251, 191, 36, 0.3); }

/* 滚动动画 */
.reveal { opacity: 1; transform: none; }

/* 工具类 */
.text-muted { color: var(--text-tertiary); }
.text-secondary { color: var(--text-secondary); }
.bg-alt { background: var(--surface-alt); }
.border-line { border-color: var(--border); }

/* 响应式调整 */
@media (max-width: 1200px) {
    .container { padding: 0 20px; }
}

@media (max-width: 768px) {
    .section { padding: 3rem 0; }
    .section-title { font-size: 1.8rem; }
    .card-grid { gap: 1.2rem; }
    .card { padding: 1.5rem; }
    .hero h1 { font-size: 2rem; }
    .footer-grid { gap: 1.5rem; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .search-box input { width: 100px; }
    .nav-wrap { gap: 0.5rem; }
    .logo a { font-size: 1.4rem; }
    .btn-primary { padding: 0.7rem 1.5rem; font-size: 0.9rem; }
    .hero-cta { flex-direction: column; }
    .hero-cta a { text-align: center; }
    .hero-badge { font-size: 0.8rem; }
    .faq-item { padding: 0.8rem 1rem; }
    .faq-question { font-size: 1rem; }
}

/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
    .card:hover, .article-item:hover, .btn-primary:hover { transform: none; }
}

/* 打印优化 */
@media print {
    .site-header, .back-to-top, .hero-cta, .search-box, .theme-toggle, .mobile-menu-btn { display: none !important; }
    body { background: #fff; color: #000; }
    .section { border-bottom: none; padding: 1.5rem 0; }
    .card, .article-item, .faq-item { box-shadow: none; border: 1px solid #ddd; }
}

/* 焦点可见性 */
a:focus-visible, button:focus-visible, input:focus-visible {
    outline: 3px solid var(--brand);
    outline-offset: 2px;
    border-radius: 4px;
}

/* 选择文本样式 */
::selection {
    background: var(--brand);
    color: #fff;
}

```