:root {
            --primary-color: #1a5fb4;
            --secondary-color: #e95420;
            --accent-color: #2ec27e;
            --dark-color: #333333;
            --light-color: #f6f5f4;
            --text-color: #2c2c2c;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
            --border-radius: 8px;
            --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: 1.7;
            color: var(--text-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: var(--primary-color);
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-color);
        }
        ul {
            list-style: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .btn {
            display: inline-block;
            padding: 12px 28px;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .site-header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .my-logo span {
            color: var(--secondary-color);
        }
        .main-nav ul {
            display: flex;
            gap: 25px;
        }
        .main-nav a {
            font-weight: 600;
            font-size: 1rem;
            padding: 5px 0;
            position: relative;
        }
        .main-nav a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--secondary-color);
            transition: var(--transition);
        }
        .main-nav a:hover:after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--dark-color);
        }
        .breadcrumb {
            padding: 15px 20px;
            background-color: var(--light-color);
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--dark-color);
        }
        .breadcrumb a:hover {
            color: var(--primary-color);
        }
        .breadcrumb span {
            margin: 0 8px;
            color: #888;
        }
        .hero {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1590958494546-8d1a7c16b332?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 80px 20px;
            text-align: center;
            margin-bottom: 40px;
        }
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 20px 0 60px;
        }
        .article-content {
            background-color: white;
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .sidebar {
            background-color: var(--light-color);
            padding: 25px;
            border-radius: var(--border-radius);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        h1, h2, h3, h4 {
            color: var(--dark-color);
            margin-top: 1.8em;
            margin-bottom: 0.7em;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 15px;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-color);
            padding-bottom: 8px;
            border-bottom: 1px solid #eee;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--secondary-color);
        }
        h4 {
            font-size: 1.2rem;
            color: #555;
        }
        p {
            margin-bottom: 1.5em;
            font-size: 1.05rem;
        }
        .intro {
            font-size: 1.2rem;
            background-color: #f0f7ff;
            padding: 25px;
            border-left: 5px solid var(--primary-color);
            border-radius: var(--border-radius);
            margin-bottom: 2em;
        }
        .highlight {
            background-color: #fff9e6;
            padding: 20px;
            border-radius: var(--border-radius);
            border-left: 5px solid var(--accent-color);
            margin: 2em 0;
        }
        .feature-img {
            margin: 2.5em auto;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            max-width: 900px;
        }
        .caption {
            text-align: center;
            font-style: italic;
            color: #666;
            font-size: 0.95rem;
            margin-top: 10px;
        }
        .content-link {
            font-weight: 600;
            border-bottom: 1px dashed var(--primary-color);
        }
        .content-link:hover {
            border-bottom-style: solid;
        }
        .interactive-module {
            background-color: #f9f9f9;
            border-radius: var(--border-radius);
            padding: 25px;
            margin: 3em 0;
            border: 1px solid #e1e1e1;
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
            color: var(--primary-color);
        }
        .module-title i {
            font-size: 1.5rem;
        }
        .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(--dark-color);
        }
        .form-control {
            padding: 12px 15px;
            border: 1px solid #ccc;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(26, 95, 180, 0.1);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
            font-family: inherit;
        }
        .star-rating {
            display: flex;
            gap: 10px;
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            margin: 10px 0;
        }
        .star-rating .star:hover,
        .star-rating .star.active {
            color: #ffc107;
        }
        .site-footer {
            background-color: var(--dark-color);
            color: #ccc;
            padding: 50px 0 20px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            margin-bottom: 15px;
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.2rem;
        }
        .footer-links ul {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .footer-links a {
            color: #aaa;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.05);
            padding: 20px;
            border-radius: var(--border-radius);
            margin-top: 30px;
        }
        friend-link h4 {
            color: white;
            margin-bottom: 15px;
        }
        friend-link a {
            color: var(--accent-color);
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #444;
            font-size: 0.9rem;
            color: #888;
        }
        .update-time {
            background-color: var(--light-color);
            padding: 15px;
            border-radius: var(--border-radius);
            margin-top: 40px;
            font-size: 0.9rem;
            color: #666;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .update-time i {
            color: var(--accent-color);
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: 90px;
                left: 0;
                width: 100%;
                background-color: white;
                box-shadow: var(--shadow);
                padding: 20px;
                transform: translateY(-150%);
                opacity: 0;
                transition: var(--transition);
                z-index: 999;
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 15px;
            }
            .header-container {
                padding: 15px;
            }
            .hero {
                padding: 60px 20px;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .article-content {
                padding: 20px;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
        }
        @media (max-width: 480px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            .btn {
                padding: 10px 20px;
            }
            .interactive-module {
                padding: 20px;
            }
        }