* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.8;
            color: #333;
            background-color: #f8f9fa;
            max-width: 120rem;
            margin: 0 auto;
            padding: 0 1rem;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: #3a86ff; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #ff006e; }
        .site-header {
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
            color: white;
            padding: 1.5rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            background: linear-gradient(90deg, #00dbde, #fc00ff);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            padding: 0.5rem;
            border-radius: 8px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        .my-logo:hover { transform: scale(1.03); }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #e2e2e2;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .main-nav a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            color: #fff;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: #666;
        }
        .breadcrumb a { color: #555; }
        .breadcrumb a:hover { color: #3a86ff; }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr minmax(300px, 25%);
            gap: 3rem;
            margin: 2rem 0;
        }
        main { background: white; padding: 2.5rem; border-radius: 16px; box-shadow: 0 6px 20px rgba(0,0,0,0.08); }
        aside { background: white; padding: 1.5rem; border-radius: 16px; box-shadow: 0 4px 12px rgba(0,0,0,0.06); }
        h1 {
            font-size: 3.2rem;
            color: #1a1a2e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 8px solid #ff006e;
            padding-left: 1rem;
        }
        h2 { font-size: 2.2rem; color: #16213e; margin: 2.5rem 0 1.5rem; padding-bottom: 0.5rem; border-bottom: 3px solid #00dbde; }
        h3 { font-size: 1.8rem; color: #3a86ff; margin: 2rem 0 1rem; }
        h4 { font-size: 1.4rem; color: #8338ec; margin: 1.5rem 0 0.8rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: #444;
            background: #f0f8ff;
            padding: 1.5rem;
            border-radius: 10px;
            border-left: 5px solid #3a86ff;
        }
        .highlight {
            background: linear-gradient(120deg, #ffef78 0%, #ffef78 100%);
            background-position: 0 90%;
            background-repeat: no-repeat;
            background-size: 100% 0.4em;
            padding: 0.1rem 0.2rem;
            font-weight: 700;
        }
        .quote {
            font-style: italic;
            border-left: 4px solid #8338ec;
            padding-left: 1.5rem;
            margin: 2rem 0;
            color: #555;
            background: #f9f5ff;
            padding: 1.5rem;
            border-radius: 0 10px 10px 0;
        }
        .note {
            background: #e8f4fd;
            border: 1px solid #b6d9ff;
            border-radius: 8px;
            padding: 1.2rem;
            margin: 1.5rem 0;
            display: flex;
            align-items: flex-start;
            gap: 1rem;
        }
        .note i { color: #3a86ff; font-size: 1.2rem; margin-top: 0.2rem; }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .stat-card {
            background: linear-gradient(145deg, #ffffff, #f0f0f0);
            border-radius: 12px;
            padding: 1.5rem;
            text-align: center;
            box-shadow: 5px 5px 15px #d9d9d9, -5px -5px 15px #ffffff;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 900;
            color: #ff006e;
            display: block;
            line-height: 1;
        }
        .feature-img {
            width: 100%;
            border-radius: 12px;
            margin: 2.5rem auto;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            border: 5px solid white;
            transition: transform 0.5s ease;
        }
        .feature-img:hover { transform: scale(1.01); }
        .interactive-module {
            background: #f8f9fa;
            border-radius: 12px;
            padding: 2rem;
            margin: 3rem 0;
            border: 2px solid #e9ecef;
        }
        .module-title { display: flex; align-items: center; gap: 0.8rem; margin-bottom: 1.5rem; color: #16213e; }
        .form-group { margin-bottom: 1.2rem; }
        label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #444; }
        input, textarea, select {
            width: 100%;
            padding: 0.9rem;
            border: 2px solid #ccc;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus { border-color: #3a86ff; outline: none; }
        .btn {
            background: linear-gradient(90deg, #3a86ff, #8338ec);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 50px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.7rem;
        }
        .btn:hover {
            background: linear-gradient(90deg, #ff006e, #ff9e00);
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(255, 0, 110, 0.3);
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star-rating input { display: none; }
        .star-rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label { color: #ffd700; }
        .toc {
            position: sticky;
            top: 120px;
        }
        .toc h3 { margin-top: 0; }
        .toc ul { list-style: none; }
        .toc li { margin-bottom: 0.8rem; padding-left: 1rem; border-left: 3px solid transparent; }
        .toc li:hover { border-left-color: #3a86ff; }
        .toc a { color: #555; display: block; }
        .toc a:hover { color: #3a86ff; font-weight: 600; }
        .update-time {
            background: #fff3cd;
            border: 1px solid #ffecb5;
            color: #856404;
            padding: 1rem;
            border-radius: 8px;
            margin-top: 2rem;
            font-size: 0.9rem;
        }
        .site-footer {
            background: #1a1a2e;
            color: #ccc;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
            border-radius: 16px 16px 0 0;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-links { display: flex; flex-wrap: wrap; gap: 2rem; }
        .footer-links section { min-width: 200px; }
        .footer-links h4 { color: #00dbde; margin-bottom: 1rem; }
        .footer-links ul { list-style: none; }
        .footer-links li { margin-bottom: 0.7rem; }
        friend-link {
            display: block;
            padding: 1rem;
            background: rgba(255,255,255,0.05);
            border-radius: 8px;
            margin-top: 1rem;
            border-left: 4px solid #ff006e;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #333;
            font-size: 0.9rem;
            color: #999;
        }
        @media (max-width: 992px) {
            .content-wrapper { grid-template-columns: 1fr; }
            .toc { order: -1; margin-bottom: 2rem; position: static; }
        }
        @media (max-width: 768px) {
            .header-container { flex-direction: column; align-items: flex-start; gap: 1rem; }
            .main-nav { width: 100%; display: none; }
            .main-nav.active { display: block; }
            .main-nav ul { flex-direction: column; gap: 0.5rem; }
            .hamburger { display: block; }
            h1 { font-size: 2.5rem; }
            h2 { font-size: 2rem; }
        }
        @media (max-width: 576px) {
            main, aside { padding: 1.5rem; }
            .stats-grid { grid-template-columns: 1fr; }
        }