:root {
            --primary: #4a6fa5;
            --secondary: #ff7b54;
            --accent: #6b48ff;
            --dark: #2c3e50;
            --light: #f8f9fa;
            --gray: #6c757d;
            --success: #28a745;
            --shadow: 0 5px 15px rgba(0,0,0,0.08);
            --border-radius: 12px;
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: #fff;
            overflow-x: hidden;
        }
        .site-header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .my-logo i {
            color: var(--secondary);
        }
        .my-logo:hover {
            color: var(--accent);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
            transition: var(--transition);
        }
        .main-nav a:hover {
            color: var(--primary);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--secondary);
            transition: var(--transition);
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--dark);
            cursor: pointer;
        }
        .breadcrumb {
            max-width: var(--max-width);
            margin: 1rem auto;
            padding: 0 2rem;
            font-size: 0.9rem;
            color: var(--gray);
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .main-container {
            max-width: var(--max-width);
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        article {
            background: white;
            border-radius: var(--border-radius);
            padding: 2.5rem;
            box-shadow: var(--shadow);
        }
        .article-header {
            margin-bottom: 2.5rem;
            border-bottom: 2px solid var(--light);
            padding-bottom: 1.5rem;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--dark);
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            color: var(--gray);
            font-size: 0.95rem;
        }
        .update-time {
            background-color: #fff3cd;
            padding: 0.5rem 1rem;
            border-radius: 50px;
            color: #856404;
            font-weight: 600;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px dashed #ddd;
        }
        h3 {
            font-size: 1.6rem;
            color: var(--dark);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--gray);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--primary);
            background-color: #f0f7ff;
            padding: 1.5rem;
            border-left: 5px solid var(--accent);
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin-bottom: 2rem;
        }
        .content-img {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: var(--border-radius);
            margin: 2rem auto;
            display: block;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            transition: transform 0.5s ease;
        }
        .content-img:hover {
            transform: scale(1.01);
        }
        .highlight {
            background-color: #fff9e6;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            border-left: 4px solid var(--secondary);
            margin: 2rem 0;
        }
        .highlight strong {
            color: var(--secondary);
        }
        .link-list {
            background-color: var(--light);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            margin: 2rem 0;
        }
        .link-list h4 {
            margin-top: 0;
        }
        .link-list ul {
            list-style-position: inside;
            columns: 2;
        }
        .link-list li {
            margin-bottom: 0.5rem;
        }
        .link-list a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        .link-list a:hover {
            color: var(--accent);
            text-decoration: underline;
        }
        .interactive-module {
            background-color: #f8f9fa;
            border-radius: var(--border-radius);
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid #e9ecef;
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 1.5rem;
            color: var(--primary);
        }
        .module-title i {
            font-size: 1.8rem;
        }
        .search-form, .comment-form, .rating-form {
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        label {
            font-weight: 600;
            color: var(--dark);
        }
        input, textarea, select {
            padding: 0.9rem 1.2rem;
            border: 1px solid #ced4da;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.2);
        }
        button {
            padding: 0.9rem 2rem;
            background-color: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            align-self: flex-start;
        }
        button:hover {
            background-color: var(--accent);
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(107, 72, 255, 0.2);
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            font-size: 2rem;
            color: #ddd;
            margin: 0.5rem 0;
        }
        .star-rating .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating .star:hover,
        .star-rating .star.active {
            color: #ffc107;
        }
        aside {
            position: sticky;
            top: 120px;
            height: fit-content;
        }
        .sidebar-widget {
            background: white;
            border-radius: var(--border-radius);
            padding: 1.8rem;
            margin-bottom: 2rem;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            font-size: 1.3rem;
            margin-top: 0;
            margin-bottom: 1.2rem;
            color: var(--primary);
            padding-bottom: 0.5rem;
            border-bottom: 1px solid #eee;
        }
        .related-links a {
            display: block;
            padding: 0.8rem 0;
            color: var(--dark);
            text-decoration: none;
            border-bottom: 1px dotted #eee;
            transition: var(--transition);
        }
        .related-links a:hover {
            color: var(--primary);
            padding-left: 0.5rem;
        }
        .related-links a:last-child {
            border-bottom: none;
        }
        footer {
            background-color: var(--dark);
            color: white;
            padding: 3rem 2rem 2rem;
            margin-top: 4rem;
        }
        .footer-container {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            margin-bottom: 1rem;
            display: inline-block;
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #b0b7c3;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 0.5rem;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.05);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            margin-top: 1.5rem;
        }
        friend-link a {
            color: #4a9fff;
            font-weight: 600;
        }
        .copyright {
            max-width: var(--max-width);
            margin: 3rem auto 0;
            padding-top: 2rem;
            border-top: 1px solid #444;
            text-align: center;
            color: #b0b7c3;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .main-container {
                grid-template-columns: 1fr;
            }
            aside {
                position: static;
            }
            h1 {
                font-size: 2.3rem;
            }
            h2 {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                padding: 1rem;
            }
            .main-nav {
                position: fixed;
                top: 80px;
                left: 0;
                width: 100%;
                background-color: white;
                box-shadow: var(--shadow);
                clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
                transition: var(--transition);
                z-index: 999;
            }
            .main-nav.active {
                clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
            }
            .main-nav ul {
                flex-direction: column;
                padding: 2rem;
                gap: 1.5rem;
            }
            .hamburger {
                display: block;
            }
            .main-container, .breadcrumb {
                padding: 0 1rem;
            }
            article {
                padding: 1.5rem;
            }
            .link-list ul {
                columns: 1;
            }
            .footer-container {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }