* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f7f9fc;
            color: #1e293b;
            line-height: 1.7;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        /* 导航 */
        nav {
            background: #ffffff;
            border-bottom: 1px solid #e9edf2;
            padding: 14px 20px;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 8px rgba(0,0,0,0.02);
        }
        nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .logo {
            font-weight: 600;
            font-size: 1.25rem;
            letter-spacing: 0.5px;
            color: #0f172a;
        }
        .nav-links {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }
        .nav-links a {
            text-decoration: none;
            color: #334155;
            font-size: 0.95rem;
            padding: 6px 0;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s, color 0.2s;
        }
        .nav-links a:hover {
            color: #0ea5e9;
            border-bottom-color: #0ea5e9;
        }
        /* H1 */
        h1 {
            font-size: 2.2rem;
            font-weight: 600;
            text-align: center;
            padding: 50px 20px 20px;
            color: #0f172a;
            letter-spacing: -0.02em;
        }
        /* 区块通用 */
        section {
            background: #ffffff;
            border-radius: 24px;
            padding: 40px 30px;
            margin: 30px auto;
            max-width: 1200px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.02);
            border: 1px solid #eef2f6;
        }
        h2 {
            font-size: 1.6rem;
            font-weight: 500;
            margin-bottom: 20px;
            color: #0f172a;
            border-left: 4px solid #0ea5e9;
            padding-left: 14px;
        }
        .grid-2, .grid-3, .grid-4 {
            display: grid;
            gap: 24px;
        }
        .grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px,1fr)); }
        .grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); }
        .grid-4 { grid-template-columns: repeat(auto-fit, minmax(180px,1fr)); }
        .card {
            background: #fafcff;
            border: 1px solid #e9edf2;
            border-radius: 18px;
            padding: 20px;
            transition: transform 0.15s, box-shadow 0.2s;
        }
        .card:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.03);
        }
        .card img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-radius: 12px;
            margin-bottom: 14px;
            background: #eef2f6;
        }
        .card h3 {
            font-size: 1.1rem;
            font-weight: 500;
            margin-bottom: 8px;
            color: #0f172a;
        }
        .card p {
            color: #475569;
            font-size: 0.92rem;
        }
        .date-badge {
            display: inline-block;
            background: #e0f2fe;
            color: #0369a1;
            padding: 2px 10px;
            border-radius: 12px;
            font-size: 0.75rem;
            font-weight: 500;
            margin-bottom: 6px;
        }
        .btn {
            display: inline-block;
            background: #0ea5e9;
            color: white;
            padding: 10px 28px;
            border-radius: 40px;
            text-decoration: none;
            font-weight: 500;
            transition: background 0.2s;
            border: none;
        }
        .btn:hover {
            background: #0284c7;
        }
        .text-center { text-align: center; }
        .mt-20 { margin-top: 20px; }
        .mb-10 { margin-bottom: 10px; }
        .flex-center { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 16px; }
        /* 统计数字 */
        .stat-number {
            font-size: 2rem;
            font-weight: 600;
            color: #0ea5e9;
        }
        /* 页脚 */
        footer {
            background: #ffffff;
            border-top: 1px solid #e9edf2;
            padding: 40px 20px 30px;
            margin-top: 50px;
            font-size: 0.9rem;
            color: #475569;
        }
        footer .container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .footer-links a {
            color: #334155;
            text-decoration: none;
            border-bottom: 1px solid transparent;
        }
        .footer-links a:hover {
            color: #0ea5e9;
            border-bottom-color: #0ea5e9;
        }
        .footer-info {
            text-align: center;
            line-height: 1.8;
        }
        .footer-info a {
            color: #0ea5e9;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin: 10px 0;
        }
        .friend-links a {
            color: #334155;
            text-decoration: none;
            padding: 0 6px;
        }
        .friend-links a:hover {
            color: #0ea5e9;
        }
        @media (max-width: 640px) {
            h1 { font-size: 1.6rem; padding: 30px 16px 16px; }
            section { padding: 24px 16px; }
            .nav-links { gap: 12px; }
            .nav-links a { font-size: 0.85rem; }
        }