```css
/* ===== CSS变量 (浅色/深色) ===== */
:root {
    --bg: #f5f7fa;
    --surface: #ffffff;
    --surface-alt: #eef1f5;
    --text-main: #1f2937;   /* 深灰蓝，正文高对比 */
    --text-title: #0b1a2f;  /* 深蓝黑，标题 */
    --text-sub: #334155;    /* 次级文字 */
    --text-link: #1e4a7a;   /* 深蓝链接 */
    --border: #d1d9e6;
    --btn-bg: #0b1a2f;
    --btn-text: #ffffff;
    --nav-bg: #0b1a2f;
    --nav-text: #e2e8f0;
    --footer-bg: #111e2e;
    --footer-text: #cbd5e1;
    --card-bg: #ffffff;
    --shadow: 0 4px 12px rgba(0,0,0,0.05);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
    --gradient-banner: linear-gradient(135deg, #0b1a2f 0%, #1e3a5f 50%, #2d6a9f 100%);
    --card-hover-shadow: 0 12px 24px rgba(0,0,0,0.1);
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    --bg: #0e1622;
    --surface: #1a2533;
    --surface-alt: #1f2b39;
    --text-main: #e2e8f0;
    --text-title: #f8fafc;
    --text-sub: #b0c4de;
    --text-link: #8ab4f8;
    --border: #2d3e55;
    --btn-bg: #2d4a7a;
    --btn-text: #ffffff;
    --nav-bg: #0b111e;
    --nav-text: #e2e8f0;
    --footer-bg: #0d1520;
    --footer-text: #b0c4de;
    --card-bg: #1a2533;
    --shadow: 0 4px 12px rgba(0,0,0,0.4);
    --glass-bg: rgba(26, 37, 51, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --gradient-banner: linear-gradient(135deg, #0b111e 0%, #1a2533 50%, #2d4a7a 100%);
    --card-hover-shadow: 0 12px 24px rgba(0,0,0,0.6);
}

/* 全局重置与基础 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    background-color: var(--bg);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.7;
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: var(--text-link);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

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

/* 标题层级颜色 */
h1, h2, h3, h4 {
    color: var(--text-title);
    line-height: 1.3;
    font-weight: 600;
    letter-spacing: -0.02em;
}

h1 {
    font-size: 2.2rem;
    margin: 0.5rem 0 1rem;
    color: var(--text-title);
}

h2 {
    font-size: 1.8rem;
    margin: 2.5rem 0 1rem;
    border-left: 6px solid #2d6a9f;
    padding-left: 1rem;
    position: relative;
}

h2::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 0;
    width: 6px;
    height: 100%;
    background: linear-gradient(to bottom, #2d6a9f, #1e4a7a);
    border-radius: 3px;
}

h3 {
    font-size: 1.4rem;
    margin: 1.8rem 0 0.8rem;
}

h4 {
    font-size: 1.2rem;
    margin: 1.2rem 0 0.5rem;
    color: var(--text-main);
    font-weight: 600;
}

p {
    margin-bottom: 1.2rem;
    color: var(--text-main);
    line-height: 1.8;
}

ul, ol {
    margin: 0 0 1.5rem 1.5rem;
    color: var(--text-main);
}

li {
    margin-bottom: 0.4rem;
    line-height: 1.8;
}

/* 导航 */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--nav-bg);
    color: var(--nav-text);
    box-shadow: 0 2px 12px rgba(0,0,0,0.1);
    transition: background 0.3s ease, box-shadow 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1300px;
    margin: 0 auto;
    padding: 0.8rem 1.5rem;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 1px;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.logo a:hover {
    opacity: 0.85;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.8rem;
    align-items: center;
}

.nav-links a {
    color: var(--nav-text);
    font-weight: 500;
    transition: color 0.2s ease, transform 0.2s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: #ffffff;
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: #ffffff;
    text-decoration: none;
    transform: translateY(-1px);
}

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

.theme-toggle, .search-toggle {
    background: none;
    border: none;
    color: var(--nav-text);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover, .search-toggle:hover {
    background: rgba(255,255,255,0.15);
    transform: scale(1.1);
}

/* 移动菜单 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--nav-text);
    font-size: 1.8rem;
    cursor: pointer;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    transition: background 0.2s ease;
}

.menu-toggle:hover {
    background: rgba(255,255,255,0.15);
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--nav-bg);
        padding: 1rem 2rem;
        gap: 1rem;
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border-bottom: 1px solid rgba(255,255,255,0.1);
        box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    .nav-links.open {
        display: flex;
        animation: slideDown 0.3s ease;
    }
    .menu-toggle {
        display: block;
    }
}

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

/* 搜索条 */
.search-bar {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0.5rem 1.5rem;
    display: none;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s ease;
}

.search-bar.show {
    display: block;
    animation: slideDown 0.3s ease;
}

.search-bar input {
    width: 100%;
    padding: 0.7rem 1rem;
    border: 2px solid var(--border);
    border-radius: 30px;
    background: var(--surface);
    color: var(--text-main);
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    outline: none;
}

.search-bar input:focus {
    border-color: var(--text-link);
    box-shadow: 0 0 0 3px rgba(30, 74, 122, 0.1);
}

/* 主容器 */
.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 1.5rem;
}

/* 卡片区域 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.8rem;
    margin: 2rem 0;
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    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;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--text-link), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-hover-shadow);
    border-color: var(--text-link);
}

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

.card h3 {
    margin-top: 0.2rem;
    font-size: 1.3rem;
}

.card p {
    color: var(--text-main);
    margin-bottom: 0.8rem;
}

/* 按钮 */
.btn {
    display: inline-block;
    background: var(--btn-bg);
    color: var(--btn-text);
    padding: 0.6rem 1.4rem;
    border-radius: 30px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    text-decoration: none;
    font-size: 0.95rem;
}

.btn:hover {
    opacity: 0.9;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    text-decoration: none;
}

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

/* 文章列表 */
.article-list {
    margin: 2rem 0;
}

.article-item {
    padding: 1.2rem 0;
    border-bottom: 1px solid var(--border);
    transition: padding-left 0.3s ease, background 0.3s ease;
    border-radius: 8px;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}

.article-item:hover {
    padding-left: 1rem;
    background: var(--surface-alt);
}

.article-item h4 {
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.article-item:hover h4 {
    color: var(--text-link);
}

.article-meta {
    font-size: 0.9rem;
    color: var(--text-sub);
    margin-bottom: 0.5rem;
}

/* FAQ */
.faq-container {
    margin: 2rem 0;
}

.faq-item {
    background: var(--surface);
    border-radius: 12px;
    margin-bottom: 1rem;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.faq-item:hover {
    border-color: var(--text-link);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.faq-item.open {
    border-color: var(--text-link);
}

.faq-question {
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-title);
    transition: background 0.3s ease;
    user-select: none;
}

.faq-question:hover {
    background: var(--surface-alt);
}

.faq-question span {
    font-size: 1.5rem;
    font-weight: 300;
    transition: transform 0.3s ease;
    color: var(--text-link);
}

.faq-item.open .faq-question span {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.5rem 1rem;
    display: none;
    color: var(--text-main);
    animation: fadeIn 0.3s ease;
}

.faq-item.open .faq-answer {
    display: block;
}

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

/* 表格 */
.table-wrap {
    overflow-x: auto;
    margin: 1.5rem 0;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    min-width: 600px;
}

th, td {
    padding: 0.8rem 1rem;
    border: 1px solid var(--border);
    text-align: left;
    color: var(--text-main);
    transition: background 0.2s ease;
}

th {
    background: var(--surface-alt);
    font-weight: 600;
    color: var(--text-title);
}

tr:hover td {
    background: var(--surface-alt);
}

/* footer */
.footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 2.5rem 1.5rem 1.5rem;
    margin-top: 3rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer a {
    color: #b0c4de;
    transition: color 0.2s ease;
}

.footer a:hover {
    color: #ffffff;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 1300px;
    margin: 0 auto;
}

.footer h4 {
    color: #ffffff;
    margin-bottom: 0.5rem;
}

.footer-bottom {
    text-align: center;
    margin-top: 2rem;
    border-top: 1px solid #2d3e55;
    padding-top: 1.5rem;
    color: var(--footer-text);
    font-size: 0.9rem;
}

/* 回到顶部 */
.to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--btn-bg);
    color: #fff;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    border: none;
    z-index: 999;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.to-top.show {
    opacity: 1;
    visibility: visible;
}

.to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.3);
}

/* 数字动画 */
.stat-number {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-title);
}

/* 横幅 */
.banner {
    background: var(--gradient-banner);
    color: #f1f5f9;
    padding: 3rem 1.5rem;
    border-radius: 24px;
    margin: 1.5rem 0;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.1) 0%, transparent 50%);
}

.banner::after {
    content: '';
    position: absolute;
    bottom: -50%;
    right: -20%;
    width: 60%;
    height: 100%;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(3deg);
    }
}

.banner h2 {
    color: #ffffff;
    border-left: none;
    position: relative;
    z-index: 1;
}

.banner h1 {
    color: #ffffff;
    position: relative;
    z-index: 1;
}

.banner p {
    color: #e2e8f0;
    position: relative;
    z-index: 1;
}

/* 滚动动画 */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* 毛玻璃效果 */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
}

/* 响应式细节 */
@media (max-width: 600px) {
    h1 {
        font-size: 1.8rem;
    }
    h2 {
        font-size: 1.4rem;
    }
    .nav-inner {
        padding: 0.6rem 1rem;
    }
    .container {
        padding: 1rem;
    }
    .banner {
        padding: 2rem 1rem;
        border-radius: 16px;
    }
    .card-grid {
        grid-template-columns: 1fr;
    }
    .to-top {
        bottom: 1rem;
        right: 1rem;
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}

@media (max-width: 400px) {
    h1 {
        font-size: 1.5rem;
    }
    .nav-inner {
        flex-wrap: wrap;
    }
    .logo {
        font-size: 1.2rem;
    }
}

/* 打印风格 */
@media print {
    .navbar, .footer, .to-top, .search-bar {
        display: none !important;
    }
    body {
        background: #ffffff;
        color: #000000;
    }
    .container {
        max-width: 100%;
    }
}

/* 辅助功能 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 5px;
}

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

/* 选中文本 */
::selection {
    background: var(--text-link);
    color: #ffffff;
}
```