* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #2c5aa0; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #e63946; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .site-header {
            background: linear-gradient(90deg, #1a237e 0%, #283593 50%, #3949ab 100%);
            color: white;
            padding: 1.2rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 2px;
            background: linear-gradient(to right, #ffcc00, #ff9966);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        .my-logo a { background: transparent; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #e3f2fd;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
        }
        .main-nav a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #edf2f7;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #cbd5e0;
        }
        .breadcrumb a { color: #4a5568; }
        .breadcrumb a:hover { color: #2d3748; }
        .breadcrumb span { color: #718096; }
        main { flex: 1; padding: 2.5rem 0; }
        article {
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            padding: 2.5rem;
            margin-bottom: 2.5rem;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #ffcc00;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin: 2.5rem 0 1.2rem;
            padding-left: 0.5rem;
            border-left: 5px solid #e63946;
        }
        h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #5c6bc0;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            hyphens: auto;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: #2d3748;
            background-color: #f7fafc;
            padding: 1.2rem;
            border-left: 4px solid #4299e1;
            border-radius: 0 6px 6px 0;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fffacd;
            padding: 0.2rem 0.4rem;
            border-radius: 3px;
            font-weight: 600;
        }
        .img-container {
            margin: 2.5rem auto;
            max-width: 800px;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            border: 1px solid #e2e8f0;
        }
        .img-container img { width: 100%; }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #718096;
            padding: 0.8rem;
            background-color: #f8f9fa;
            font-size: 0.95rem;
        }
        .link-list {
            background-color: #f8f9fa;
            border: 1px dashed #cbd5e0;
            border-radius: 8px;
            padding: 1.5rem;
            margin: 2rem 0;
        }
        .link-list ul { list-style-position: inside; }
        .link-list li { margin-bottom: 0.7rem; }
        .update-time {
            text-align: right;
            font-size: 0.9rem;
            color: #718096;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px solid #e2e8f0;
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .feature-box {
            background: linear-gradient(145deg, #ffffff, #f0f4f8);
            border-radius: 10px;
            padding: 1.8rem;
            box-shadow: 0 6px 15px rgba(0,0,0,0.05);
            border: 1px solid #e2e8f0;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .feature-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 25px rgba(0,0,0,0.1);
        }
        .feature-box h3 { margin-top: 0; }
        form input, form textarea, form select {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid #cbd5e0;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
        }
        form button {
            background: linear-gradient(to right, #2c5aa0, #e63946);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: opacity 0.3s ease;
        }
        form button:hover { opacity: 0.9; }
        .stars { color: #ffcc00; font-size: 1.5rem; margin: 0.5rem 0; }
        .stars i { cursor: pointer; margin-right: 0.2rem; }
        footer {
            background: linear-gradient(90deg, #1a237e, #283593);
            color: white;
            padding: 2.5rem 0 1.5rem;
            margin-top: auto;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: #ffcc00;
            margin-bottom: 1.2rem;
            font-size: 1.4rem;
        }
        .footer-section ul { list-style: none; }
        .footer-section li { margin-bottom: 0.7rem; }
        .footer-section a { color: #e3f2fd; }
        .footer-section a:hover { color: #ffcc00; }
        friend-link {
            display: inline-block;
            background-color: rgba(255,255,255,0.1);
            padding: 0.5rem 1rem;
            border-radius: 4px;
            margin-right: 0.8rem;
            margin-bottom: 0.8rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #cbd5e0;
        }
        @media (max-width: 768px) {
            .header-content { flex-wrap: wrap; }
            .main-nav { order: 3; width: 100%; margin-top: 1rem; display: none; }
            .main-nav.active { display: block; }
            .main-nav ul { flex-direction: column; gap: 0.5rem; }
            .hamburger { display: block; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            article { padding: 1.8rem; }
            .interactive-section { grid-template-columns: 1fr; }
        }