:root {
            --primary: #2c3e50;
            --secondary: #e74c3c;
            --accent: #3498db;
            --light: #ecf0f1;
            --dark: #1a252f;
            --text: #333333;
            --text-light: #7f8c8d;
            --success: #27ae60;
            --warning: #f39c12;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --border-radius: 8px;
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text);
            background-color: #f9f9f9;
            overflow-x: hidden;
        }
        .site-header {
            background-color: var(--primary);
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            letter-spacing: 2px;
            display: flex;
            align-items: center;
            transition: var(--transition);
        }
        .my-logo:hover {
            color: var(--accent);
            transform: scale(1.05);
        }
        .my-logo i {
            color: var(--secondary);
            margin-right: 10px;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
        }
        .main-nav li {
            margin-left: 30px;
        }
        .main-nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 8px 12px;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .main-nav a:hover,
        .main-nav a.active {
            background-color: var(--accent);
            color: white;
        }
        .breadcrumb {
            background-color: var(--light);
            padding: 12px 20px;
            font-size: 0.9rem;
            border-bottom: 1px solid #ddd;
        }
        .breadcrumb ol {
            max-width: var(--max-width);
            margin: 0 auto;
            display: flex;
            list-style: none;
        }
        .breadcrumb li {
            margin-right: 10px;
        }
        .breadcrumb li:after {
            content: ">";
            margin-left: 10px;
            color: var(--text-light);
        }
        .breadcrumb li:last-child:after {
            content: "";
        }
        .breadcrumb a {
            color: var(--accent);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 10px;
        }
        .container {
            max-width: var(--max-width);
            margin: 30px auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .main-content {
            background-color: white;
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 25px;
        }
        .widget {
            background-color: white;
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .widget h3 {
            color: var(--primary);
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent);
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary);
            margin-bottom: 20px;
            line-height: 1.2;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary);
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid #eee;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--dark);
            margin: 30px 0 15px;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--text);
            margin: 25px 0 10px;
        }
        p {
            margin-bottom: 20px;
            font-size: 1.1rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: var(--primary);
            background-color: var(--light);
            padding: 20px;
            border-left: 4px solid var(--accent);
            border-radius: var(--border-radius);
            margin-bottom: 30px;
        }
        .highlight {
            background-color: #fff9e6;
            padding: 15px;
            border-left: 4px solid var(--warning);
            margin: 20px 0;
            border-radius: var(--border-radius);
        }
        .content-link {
            color: var(--accent);
            text-decoration: none;
            font-weight: 600;
            border-bottom: 1px dotted var(--accent);
            transition: var(--transition);
        }
        .content-link:hover {
            color: var(--secondary);
            border-bottom: 1px solid var(--secondary);
        }
        .article-image {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: var(--border-radius);
            margin: 25px 0;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .article-image:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }
        .search-form,
        .comment-form,
        .rating-form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .form-group label {
            font-weight: 600;
            color: var(--primary);
        }
        .form-control {
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        .btn {
            padding: 12px 25px;
            background-color: var(--accent);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        .btn:hover {
            background-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }
        .btn-secondary {
            background-color: var(--secondary);
        }
        .btn-secondary:hover {
            background-color: #c0392b;
        }
        .rating-stars {
            display: flex;
            gap: 5px;
            margin: 10px 0;
        }
        .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: var(--warning);
        }
        .site-footer {
            background-color: var(--dark);
            color: white;
            padding: 50px 20px 30px;
            margin-top: 60px;
        }
        .footer-container {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.5rem;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent);
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255, 255, 255, 0.1);
            padding: 15px;
            border-radius: var(--border-radius);
            margin-bottom: 15px;
            transition: var(--transition);
        }
        friend-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateX(5px);
        }
        friend-link a {
            color: white;
            text-decoration: none;
            font-weight: 600;
        }
        .copyright {
            max-width: var(--max-width);
            margin: 40px auto 0;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            color: #bdc3c7;
            font-size: 0.9rem;
        }
        .update-time {
            background-color: var(--light);
            padding: 15px;
            border-radius: var(--border-radius);
            margin: 30px 0;
            display: flex;
            align-items: center;
            gap: 10px;
            font-style: italic;
            color: var(--text-light);
        }
        @media (max-width: 992px) {
            .container {
                grid-template-columns: 1fr;
            }
            .sidebar {
                order: -1;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                height: 70px;
            }
            .main-nav {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--primary);
                flex-direction: column;
                align-items: center;
                padding: 20px 0;
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
                box-shadow: var(--shadow);
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .main-nav ul {
                flex-direction: column;
                width: 100%;
                align-items: center;
            }
            .main-nav li {
                margin: 0;
                width: 100%;
                text-align: center;
            }
            .main-nav a {
                display: block;
                padding: 15px;
                border-radius: 0;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .main-content {
                padding: 25px;
            }
        }
        @media print {
            .site-header, .sidebar, .site-footer, .search-form, .comment-form, .rating-form {
                display: none;
            }
            .container {
                grid-template-columns: 1fr;
                margin: 0;
                padding: 0;
            }
            .main-content {
                box-shadow: none;
                padding: 0;
            }
            h1, h2, h3, h4 {
                page-break-after: avoid;
            }
            p {
                page-break-inside: avoid;
            }
        }