* { 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: #2c3e50;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            background-attachment: fixed;
            max-width: 1400px;
            margin: 0 auto;
            box-shadow: 0 0 40px rgba(0, 0, 100, 0.08);
        }
        a { color: #2980b9; text-decoration: none; transition: all 0.3s ease; }
        a:hover { color: #e74c3c; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 95%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .site-header {
            background: linear-gradient(90deg, #1a237e, #283593, #3949ab);
            color: white;
            padding: 1.5rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-family: 'Trebuchet MS', sans-serif;
            font-size: 2.2rem;
            font-weight: 900;
            letter-spacing: -1px;
            background: linear-gradient(to right, #ffcc00, #ff9900);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        .my-logo a { background: transparent; }
        .my-logo a:hover { text-decoration: none; }
        .search-form {
            display: flex;
            flex-grow: 0.4;
            margin: 0 20px;
        }
        .search-input {
            flex-grow: 1;
            padding: 12px 18px;
            border: none;
            border-radius: 30px 0 0 30px;
            font-size: 1rem;
            background: rgba(255, 255, 255, 0.95);
        }
        .search-btn {
            background: linear-gradient(to right, #ff5722, #ff9800);
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 0 30px 30px 0;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.3s;
        }
        .search-btn:hover { background: linear-gradient(to right, #e64a19, #f57c00); }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #e3f2fd;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 5px;
        }
        .main-nav a:hover {
            background-color: rgba(255, 255, 255, 0.2);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #f1f8ff;
            border-bottom: 1px solid #d1e3ff;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #5c6bc0; }
        .breadcrumb a:hover { color: #3949ab; }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 2.5rem 0;
        }
        @media (max-width: 992px) {
            .content-wrapper { grid-template-columns: 1fr; }
        }
        .main-article {
            background: white;
            padding: 2.5rem;
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
        }
        .article-header { margin-bottom: 2.5rem; }
        .article-header h1 {
            font-size: 2.8rem;
            color: #1a237e;
            line-height: 1.2;
            margin-bottom: 1rem;
            border-left: 6px solid #ff9800;
            padding-left: 20px;
        }
        .meta-info {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            color: #7b8a8b;
            font-size: 0.95rem;
            border-bottom: 1px dashed #ddd;
            padding-bottom: 1rem;
        }
        .update-time { color: #e74c3c; font-weight: bold; }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #ffcc00;
        }
        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;
            font-size: 1.1rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.3rem;
            color: #2c3e50;
            background: #f0f8ff;
            padding: 1.5rem;
            border-radius: 10px;
            border-left: 5px solid #3498db;
            margin-bottom: 2.5rem;
        }
        .highlight {
            background: linear-gradient(120deg, #ffecb3 0%, #ffcc80 100%);
            padding: 1.5rem;
            border-radius: 10px;
            border-left: 5px solid #ff9800;
            margin: 2rem 0;
            font-weight: 600;
        }
        .stats-box {
            background: #e8f5e9;
            border: 2px solid #4caf50;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .stats-box h4 { color: #2e7d32; margin-top: 0; }
        .article-img {
            width: 100%;
            border-radius: 12px;
            margin: 2rem auto;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
            transition: transform 0.5s ease;
        }
        .article-img:hover { transform: scale(1.01); }
        .sidebar {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05);
            align-self: start;
            position: sticky;
            top: 140px;
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget h3 {
            font-size: 1.4rem;
            color: #1a237e;
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid #eee;
        }
        .related-links ul {
            list-style: none;
        }
        .related-links li {
            margin-bottom: 0.8rem;
            padding-left: 1.2rem;
            position: relative;
        }
        .related-links li:before {
            content: '🎯';
            position: absolute;
            left: 0;
        }
        .user-interaction {
            background: white;
            padding: 2.5rem;
            border-radius: 15px;
            margin-top: 3rem;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.06);
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2.5rem;
            margin-top: 1.5rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #2c3e50;
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #bdc3c7;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        .submit-btn {
            background: linear-gradient(to right, #3498db, #2ecc71);
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1.1rem;
            font-weight: bold;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .submit-btn:hover {
            background: linear-gradient(to right, #2980b9, #27ae60);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }
        .star-rating {
            display: flex;
            gap: 8px;
            font-size: 1.8rem;
            color: #ffd700;
            cursor: pointer;
            margin-bottom: 1rem;
        }
        .star-rating i { transition: transform 0.2s; }
        .star-rating i:hover { transform: scale(1.3); }
        .site-footer {
            background: linear-gradient(90deg, #1a237e, #0d1526);
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-widget h4 {
            color: #ffcc00;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.5rem;
        }
        .footer-widget h4:after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 50px;
            height: 3px;
            background: #3498db;
        }
        .footer-links ul { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #bdc3c7; }
        .footer-links a:hover { color: #ffcc00; padding-left: 5px; }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid #3498db;
            padding: 1.2rem;
            margin: 1rem 0;
            border-radius: 8px;
            transition: all 0.3s;
        }
        friend-link:hover {
            background: rgba(52, 152, 219, 0.2);
            border-color: #ffcc00;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #34495e;
            font-size: 0.95rem;
            color: #95a5a6;
        }
        @media (max-width: 768px) {
            .header-container { flex-direction: column; align-items: stretch; gap: 1.5rem; }
            .search-form { order: 3; width: 100%; margin: 1rem 0 0; }
            .hamburger { display: block; position: absolute; top: 1.5rem; right: 20px; }
            .main-nav { width: 100%; display: none; }
            .main-nav.active { display: block; }
            .main-nav ul { flex-direction: column; gap: 0.5rem; }
            .main-nav li { width: 100%; }
            .main-nav a { display: block; padding: 12px; text-align: center; border: 1px solid rgba(255,255,255,0.1); }
            .article-header h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .main-article, .sidebar, .user-interaction { padding: 1.8rem; }
        }