:root {
            --primary: #2c3e50;
            --secondary: #e74c3c;
            --accent: #3498db;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --gray: #95a5a6;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background-color: #f9f9f9;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        header {
            background: linear-gradient(135deg, var(--primary) 0%, #1a252f 100%);
            color: white;
            padding: 1.5rem 0;
            border-radius: 0 0 12px 12px;
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo span {
            color: var(--secondary);
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 1.8rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 6px;
        }
        .main-nav a:hover, .main-nav a:focus {
            background-color: rgba(255,255,255,0.15);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: var(--light);
            padding: 0.8rem 1.5rem;
            border-radius: 8px;
            margin: 1rem 0 2rem;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--dark);
        }
        .breadcrumb i {
            margin: 0 8px;
            color: var(--gray);
        }
        .search-container {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            margin-bottom: 2.5rem;
            text-align: center;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-form input {
            flex: 1;
            padding: 1rem 1.2rem;
            border: 2px solid var(--accent);
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
        }
        .search-form button {
            background: var(--accent);
            color: white;
            border: none;
            padding: 0 1.8rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .search-form button:hover {
            background: #2980b9;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin-bottom: 3rem;
        }
        article {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        h1 {
            color: var(--primary);
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 6px solid var(--secondary);
            padding-left: 1.2rem;
        }
        h2 {
            color: var(--dark);
            font-size: 2rem;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--light);
        }
        h3 {
            color: var(--primary);
            font-size: 1.6rem;
            margin: 2rem 0 1rem;
        }
        h4 {
            color: #555;
            font-size: 1.3rem;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.25rem;
            color: #2c3e50;
            font-weight: 500;
            background: #f8f9fa;
            padding: 1.2rem;
            border-radius: 8px;
            border-left: 4px solid var(--accent);
        }
        .highlight {
            background-color: #fffde7;
            padding: 1.5rem;
            border-radius: 10px;
            border: 1px dashed #fbc02d;
            margin: 1.5rem 0;
        }
        .img-container {
            text-align: center;
            margin: 2rem 0;
        }
        .feature-img {
            max-width: 100%;
            height: auto;
            border-radius: 12px;
            box-shadow: 0 6px 15px rgba(0,0,0,0.1);
        }
        .caption {
            font-style: italic;
            color: var(--gray);
            font-size: 0.9rem;
            margin-top: 0.5rem;
        }
        aside {
            background: white;
            padding: 1.8rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
            align-self: start;
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget h3 {
            font-size: 1.4rem;
            margin-bottom: 1.2rem;
            color: var(--secondary);
            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;
            color: var(--accent);
        }
        .rating-widget, .comment-widget {
            background: #f8f9fa;
            padding: 1.8rem;
            border-radius: 10px;
            margin-top: 2rem;
        }
        .rating-widget h3, .comment-widget h3 {
            margin-top: 0;
        }
        .stars {
            display: flex;
            gap: 5px;
            margin: 1rem 0;
            font-size: 1.8rem;
            color: #ffc107;
        }
        .stars a {
            color: #ddd;
            transition: var(--transition);
        }
        .stars a:hover {
            color: #ffc107;
        }
        .comment-form textarea, .comment-form input {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-family: inherit;
        }
        .comment-form button {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 0.8rem 1.8rem;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .comment-form button:hover {
            background: #c0392b;
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 3rem 0 1.5rem;
            border-radius: 12px 12px 0 0;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 1.2rem;
            font-size: 1.2rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.6rem;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
            padding: 0.8rem;
            background: rgba(255,255,255,0.1);
            border-radius: 6px;
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(255,255,255,0.2);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #bbb;
        }
        .update-time {
            background: #e8f4fc;
            padding: 0.8rem;
            border-radius: 8px;
            text-align: center;
            margin-top: 2rem;
            font-style: italic;
            color: #2c3e50;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            .main-nav ul {
                flex-direction: column;
                width: 100%;
                display: none;
                margin-top: 1.5rem;
            }
            .main-nav.active ul {
                display: flex;
            }
            .hamburger {
                display: block;
                position: absolute;
                right: 20px;
                top: 1.5rem;
            }
            h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 576px) {
            body {
                padding: 0 15px;
            }
            article, aside {
                padding: 1.5rem;
            }
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.6rem;
            }
        }