```css
/* 基础重置与全局样式 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; line-height: 1.7; color: #333; background: #f8f9fa; transition: background 0.3s, color 0.3s; }
a { color: #1a73e8; text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; padding-left: 0; }
h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.3; margin-top: 1.2em; margin-bottom: 0.6em; }
h1 { font-size: 2rem; }
h2 { font-size: 1.6rem; border-bottom: 2px solid #e9ecef; padding-bottom: 0.3em; }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.1rem; }
p { margin-bottom: 1em; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
/* 吸顶导航 */
.navbar { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,0.85); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); box-shadow: 0 2px 8px rgba(0,0,0,0.08); padding: 0 20px; transition: background 0.3s; }
.navbar-inner { display: flex; align-items: center; justify-content: space-between; max-width: 1200px; margin: 0 auto; height: 60px; }
.navbar .logo { font-size: 1.5rem; font-weight: 700; color: #2c3e50; display: flex; align-items: center; gap: 8px; }
.navbar .logo svg { width: 32px; height: 32px; }
.nav-links { display: flex; gap: 20px; }
.nav-links a { color: #555; font-size: 0.95rem; transition: color 0.2s; }
.nav-links a:hover { color: #1a73e8; text-decoration: none; }
.menu-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: #333; padding: 4px; }
/* 搜索框 */
.search-box { display: flex; align-items: center; gap: 6px; }
.search-box input { border: 1px solid #ccc; border-radius: 20px; padding: 6px 14px; font-size: 0.9rem; outline: none; width: 180px; transition: width 0.3s; }
.search-box input:focus { width: 240px; border-color: #1a73e8; }
.search-box button { background: #1a73e8; color: #fff; border: none; border-radius: 20px; padding: 6px 16px; font-size: 0.9rem; cursor: pointer; }
/* 面包屑 */
.breadcrumb { background: #f1f3f5; padding: 10px 20px; font-size: 0.85rem; color: #666; }
.breadcrumb a { color: #1a73e8; }
.breadcrumb span { margin: 0 4px; }
/* Banner */
.banner { position: relative; overflow: hidden; background: linear-gradient(135deg, #2c3e50 0%, #3498db 50%, #e67e22 100%); color: #fff; padding: 40px 20px; text-align: center; min-height: 300px; display: flex; align-items: center; justify-content: center; }
.banner-slide { display: none; flex-direction: column; align-items: center; gap: 16px; max-width: 800px; margin: 0 auto; }
.banner-slide.active { display: flex; }
.banner h1 { font-size: 2.4rem; margin: 0; color: #fff; }
.banner p { font-size: 1.1rem; opacity: 0.9; max-width: 600px; }
.banner .btn { background: #e67e22; color: #fff; padding: 12px 32px; border-radius: 30px; font-size: 1rem; font-weight: 600; border: none; cursor: pointer; transition: background 0.3s; }
.banner .btn:hover { background: #d35400; }
.banner-controls { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); display: flex; gap: 10px; }
.banner-controls button { background: rgba(255,255,255,0.3); border: none; width: 12px; height: 12px; border-radius: 50%; cursor: pointer; transition: background 0.3s; }
.banner-controls button.active { background: #fff; }
/* 模块通用 */
.section { padding: 50px 20px; }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { display: inline-block; border-bottom: 3px solid #1a73e8; padding-bottom: 8px; }
/* 网格与卡片 */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.card { background: rgba(255,255,255,0.75); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border-radius: 12px; padding: 24px; box-shadow: 0 4px 12px rgba(0,0,0,0.06); transition: transform 0.2s, box-shadow 0.2s, background 0.3s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.1); }
.card h3 { margin-top: 0; }
.card svg { width: 48px; height: 48px; margin-bottom: 12px; color: #1a73e8; }
/* 文章列表 */
.article-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; }
.article-item { background: rgba(255,255,255,0.75); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border-radius: 12px; padding: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.05); transition: transform 0.2s, box-shadow 0.2s; }
.article-item:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.1); }
.article-item h3 { font-size: 1.1rem; margin-top: 0; }
.article-item .meta { font-size: 0.85rem; color: #888; margin: 8px 0; }
.article-item p { font-size: 0.95rem; }
.article-item .read-more { display: inline-block; margin-top: 8px; color: #1a73e8; font-weight: 500; }
/* FAQ */
.faq-item { border-bottom: 1px solid #e9ecef; padding: 16px 0; }
.faq-question { font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-size: 1.05rem; }
.faq-question::after { content: '+'; font-size: 1.4rem; transition: transform 0.3s; }
.faq-item.open .faq-question::after { content: '−'; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; padding-top: 0; }
.faq-item.open .faq-answer { max-height: 600px; padding-top: 12px; }
.faq-answer p { margin-bottom: 0.5em; }
/* HowTo */
.howto-steps { counter-reset: step; }
.howto-step { padding: 12px 0; border-bottom: 1px dashed #ddd; display: flex; gap: 16px; align-items: flex-start; }
.howto-step::before { counter-increment: step; content: counter(step); background: #1a73e8; color: #fff; width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; }
/* 数字动画 */
.stats { display: flex; justify-content: space-around; flex-wrap: wrap; gap: 20px; text-align: center; padding: 30px 0; }
.stat-item h3 { font-size: 2rem; color: #1a73e8; margin: 0; }
.stat-item p { color: #666; margin: 4px 0 0; }
/* 页脚 */
.footer { background: #2c3e50; color: #ccc; padding: 40px 20px 20px; }
.footer a { color: #bbb; }
.footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 30px; margin-bottom: 30px; }
.footer h4 { color: #fff; margin-top: 0; }
.footer-bottom { border-top: 1px solid #444; padding-top: 20px; text-align: center; font-size: 0.85rem; }
/* 返回顶部 */
.back-to-top { position: fixed; bottom: 30px; right: 30px; background: #1a73e8; color: #fff; width: 44px; height: 44px; border-radius: 50%; display: none; align-items: center; justify-content: center; cursor: pointer; border: none; font-size: 1.2rem; box-shadow: 0 4px 12px rgba(0,0,0,0.2); z-index: 999; }
.back-to-top.visible { display: flex; }
/* 暗黑模式 */
body.dark { background: #1a1a2e; color: #e0e0e0; }
body.dark .navbar { background: rgba(22,33,62,0.85); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
body.dark .card, body.dark .article-item { background: rgba(30,42,74,0.75); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
body.dark .faq-item { background: transparent; }
body.dark .breadcrumb { background: #0f1a2e; }
body.dark .navbar .logo { color: #e0e0e0; }
body.dark .nav-links a { color: #ccc; }
body.dark .search-box input { background: #2a3a5a; color: #e0e0e0; border-color: #3a4a6a; }
.dark-toggle { background: none; border: none; cursor: pointer; font-size: 1.2rem; color: #333; padding: 4px; }
body.dark .dark-toggle { color: #e0e0e0; }
/* 移动菜单 */
@media (max-width: 768px) {
    .nav-links { display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0; background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); padding: 20px; box-shadow: 0 8px 16px rgba(0,0,0,0.1); }
    .nav-links.open { display: flex; }
    .menu-toggle { display: block; }
    .search-box input { width: 120px; }
    .search-box input:focus { width: 160px; }
    body.dark .nav-links { background: rgba(22,33,62,0.95); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
    h1 { font-size: 1.6rem; }
    .banner h1 { font-size: 1.8rem; }
}
/* 滚动动画 */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
/* 图片懒加载占位 */
.lazy-placeholder { background: #e9ecef; min-height: 100px; display: flex; align-items: center; justify-content: center; color: #aaa; }
```