* { 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: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        a { color: #3498db; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #1d6fa5; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .emoji { font-size: 1.2em; }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #4a148c 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 900;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i { color: #00e5ff; }
        .my-logo:hover { color: #00e5ff; }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
        }
        .nav-desktop a {
            color: #ddd;
            font-weight: 500;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
        }
        .nav-desktop a:hover {
            color: #00e5ff;
            border-bottom-color: #00e5ff;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: #2c3e50;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        .nav-mobile.active { display: flex; }
        .nav-mobile a {
            color: #ecf0f1;
            padding: 0.8rem;
            border-bottom: 1px solid #34495e;
        }
        .nav-mobile a:hover { background: #1a252f; }
        .breadcrumb {
            padding: 1rem 0;
            background: #e3f2fd;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #555; }
        .breadcrumb a:hover { color: #1a237e; }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .sidebar {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
        }
        h2 {
            font-size: 2rem;
            color: #4a148c;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e3f2fd;
        }
        h3 {
            font-size: 1.6rem;
            color: #283593;
            margin: 2rem 0 0.8rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #4527a0;
            margin: 1.5rem 0 0.6rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            color: #555;
            font-weight: 500;
            margin-bottom: 2rem;
            padding: 1rem;
            background: #f1f8ff;
            border-left: 4px solid #3498db;
            border-radius: 0 8px 8px 0;
        }
        .feature-box {
            background: linear-gradient(to right, #f8f9fa, #e3f2fd);
            border-left: 5px solid #3498db;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-box h3 { margin-top: 0; }
        .article-image {
            margin: 2rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            max-width: 800px;
        }
        .article-image img {
            width: 100%;
            transition: transform 0.5s;
        }
        .article-image:hover img { transform: scale(1.03); }
        .caption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 0.8rem;
            background: #f9f9f9;
        }
        .interactive-form {
            background: #f1f8ff;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            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);
        }
        .btn {
            background: #3498db;
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s, transform 0.2s;
        }
        .btn:hover {
            background: #1d6fa5;
            transform: translateY(-2px);
        }
        .star-rating {
            display: flex;
            gap: 5px;
            margin: 1rem 0;
        }
        .star-rating input { display: none; }
        .star-rating label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label { color: #f39c12; }
        .related-links {
            background: #f8f9fa;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .related-links h3 { margin-top: 0; }
        .related-links ul { list-style: none; }
        .related-links li {
            padding: 0.5rem 0;
            border-bottom: 1px dashed #ddd;
        }
        .related-links li:last-child { border-bottom: none; }
        .related-links a {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-links a:hover { color: #1a237e; }
        .site-footer {
            background: #1a237e;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: #00e5ff;
            margin-bottom: 1.2rem;
            font-size: 1.3rem;
        }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a {
            color: #bdc3c7;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a:hover { color: #00e5ff; }
        friend-link {
            display: block;
            background: #0d47a1;
            color: white;
            padding: 1rem;
            margin: 1rem 0;
            border-radius: 6px;
            text-align: center;
            font-weight: 600;
        }
        friend-link a { color: white; }
        friend-link:hover { background: #1565c0; }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2c3e50;
            font-size: 0.9rem;
            color: #95a5a6;
        }
        .update-time {
            font-size: 0.9rem;
            color: #7f8c8d;
            text-align: right;
            margin-bottom: 1rem;
            font-style: italic;
        }