* {
            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%, #e4edf5 100%);
            min-height: 100vh;
        }
        a {
            color: #2c5282;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        a:hover {
            color: #1a365d;
            text-decoration: underline;
        }
        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; }
        .highlight {
            background-color: #fffacd;
            padding: 2px 5px;
            border-radius: 3px;
        }
        .site-header {
            background: linear-gradient(90deg, #1e3c72, #2a5298);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 900;
            color: white;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .my-logo:hover {
            text-decoration: none;
            color: #ffdd40;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
        }
        .main-nav li {
            margin-left: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
        }
        .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;
        }
        .breadcrumb {
            background-color: #edf2f7;
            padding: 1rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: #4a5568;
        }
        .breadcrumb a:hover {
            color: #2d3748;
        }
        .breadcrumb span {
            color: #718096;
        }
        .main-content {
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 25px rgba(0,0,0,0.08);
            padding: 2.5rem;
            margin: 2rem auto;
        }
        article h1 {
            font-size: 2.8rem;
            color: #1a365d;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 4px solid #ffdd40;
            padding-bottom: 0.5rem;
        }
        article h2 {
            font-size: 2rem;
            color: #2d3748;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
        }
        article h3 {
            font-size: 1.6rem;
            color: #4a5568;
            margin: 2rem 0 1rem;
        }
        article h4 {
            font-size: 1.3rem;
            color: #718096;
            margin: 1.5rem 0 0.8rem;
        }
        article p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        article ul, article ol {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        article li {
            margin-bottom: 0.7rem;
        }
        .featured-image {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: 10px;
            margin: 2rem 0;
            border: 5px solid #edf2f7;
        }
        .update-time {
            background: #e6fffa;
            padding: 1rem;
            border-left: 5px solid #38b2ac;
            margin: 2rem 0;
            font-style: italic;
        }
        .interactive-module {
            background: #f7fafc;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            padding: 2rem;
            margin: 3rem 0;
        }
        .module-title {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            color: #2d3748;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .module-title i {
            color: #4299e1;
        }
        .search-form, .comment-form, .rating-form {
            display: grid;
            gap: 1rem;
            max-width: 600px;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid #cbd5e0;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: #4299e1;
            box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
        }
        .btn {
            background: #4299e1;
            color: white;
            padding: 0.85rem 1.8rem;
            border: none;
            border-radius: 6px;
            font-weight: bold;
            cursor: pointer;
            transition: background 0.3s;
            font-size: 1rem;
        }
        .btn:hover {
            background: #3182ce;
        }
        .stars {
            display: flex;
            gap: 10px;
            margin-bottom: 1rem;
        }
        .star {
            font-size: 2rem;
            color: #cbd5e0;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star:hover,
        .star.active {
            color: #f6ad55;
        }
        .related-links {
            background: #ebf8ff;
            padding: 2rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .related-links h3 {
            color: #2b6cb0;
            margin-top: 0;
        }
        .related-links ul {
            list-style: none;
            margin-left: 0;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
        }
        .related-links li {
            background: white;
            padding: 1rem;
            border-radius: 6px;
            transition: transform 0.3s;
        }
        .related-links li:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .site-footer {
            background: #2d3748;
            color: #cbd5e0;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #cbd5e0;
        }
        .footer-links a:hover {
            color: #ffdd40;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
            padding: 0.8rem;
            background: #4a5568;
            border-radius: 5px;
            text-align: center;
        }
        friend-link a {
            color: #90cdf4;
            font-weight: bold;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #4a5568;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #1e3c72;
                padding: 1rem;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
            }
            .main-nav.active ul {
                display: flex;
            }
            .main-nav li {
                margin: 0.5rem 0;
                margin-left: 0;
            }
            .main-nav a {
                display: block;
                padding: 1rem;
            }
            article h1 {
                font-size: 2.2rem;
            }
            article h2 {
                font-size: 1.7rem;
            }
            .header-container {
                flex-wrap: wrap;
            }
            .related-links ul {
                grid-template-columns: 1fr;
            }
        }