:root {
            --primary-color: #4CAF50;
            --secondary-color: #FF9800;
            --accent-color: #2196F3;
            --text-dark: #333333;
            --text-light: #666666;
            --bg-light: #f9f9f9;
            --bg-white: #ffffff;
            --border-color: #e0e0e0;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: var(--bg-light);
            overflow-x: hidden;
        }
        .site-header {
            background-color: var(--bg-white);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 0.8rem 2rem;
        }
        .header-container {
            max-width: var(--max-width);
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--secondary-color);
        }
        .my-logo:hover {
            color: var(--accent-color);
            transform: scale(1.02);
            transition: var(--transition);
        }
        .main-nav {
            display: flex;
            gap: 2rem;
        }
        .nav-link {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-link:hover {
            background-color: var(--primary-color);
            color: white;
        }
        .breadcrumb {
            max-width: var(--max-width);
            margin: 1rem auto;
            padding: 0 2rem;
            font-size: 0.9rem;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--accent-color);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .search-container {
            max-width: var(--max-width);
            margin: 2rem auto;
            padding: 0 2rem;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-input {
            flex-grow: 1;
            padding: 0.9rem 1.2rem;
            border: 2px solid var(--primary-color);
            border-radius: 50px 0 0 50px;
            font-size: 1rem;
            outline: none;
        }
        .search-btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 0 50px 50px 0;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .search-btn:hover {
            background-color: #3d8b40;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--text-dark);
            cursor: pointer;
        }
        .main-container {
            max-width: var(--max-width);
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        .content-area {
            background-color: var(--bg-white);
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid var(--secondary-color);
            padding-bottom: 0.8rem;
        }
        h2 {
            font-size: 2rem;
            color: var(--text-dark);
            margin: 2.5rem 0 1.2rem;
            padding-left: 0.8rem;
            border-left: 5px solid var(--accent-color);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--text-dark);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--text-light);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            color: var(--text-light);
            font-weight: 500;
            padding: 1rem;
            background-color: #f0f7ff;
            border-radius: 8px;
            margin-bottom: 2rem;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-light);
            font-size: 0.9rem;
        }
        .update-time {
            color: var(--accent-color);
            font-weight: 600;
        }
        .featured-image {
            width: 100%;
            height: auto;
            border-radius: 10px;
            margin: 2rem 0;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            transition: var(--transition);
        }
        .featured-image:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 25px rgba(0,0,0,0.15);
        }
        .highlight {
            background-color: #fff9e6;
            border-left: 4px solid var(--secondary-color);
            padding: 1.5rem;
            margin: 1.8rem 0;
            border-radius: 0 8px 8px 0;
        }
        .download-box {
            background: linear-gradient(135deg, #4CAF50, #2E7D32);
            color: white;
            padding: 2rem;
            border-radius: 10px;
            text-align: center;
            margin: 2.5rem 0;
            box-shadow: var(--shadow);
        }
        .download-btn {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            padding: 1rem 2.5rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: bold;
            font-size: 1.2rem;
            margin-top: 1rem;
            transition: var(--transition);
        }
        .download-btn:hover {
            background-color: #e68900;
            transform: scale(1.05);
        }
        .link-list {
            background-color: #f5f5f5;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
        }
        .link-list h3 {
            margin-top: 0;
        }
        .link-list ul {
            list-style-type: none;
            column-count: 2;
        }
        .link-list li {
            margin-bottom: 0.8rem;
        }
        .link-list a {
            color: var(--accent-color);
            text-decoration: none;
            transition: var(--transition);
        }
        .link-list a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background-color: var(--bg-white);
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .rating-widget {
            text-align: center;
        }
        .stars {
            font-size: 1.8rem;
            color: #FFD700;
            margin: 1rem 0;
        }
        .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover {
            transform: scale(1.2);
        }
        .rating-form input, .comment-form textarea, .comment-form input {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid var(--border-color);
            border-radius: 5px;
        }
        .rating-form button, .comment-form button {
            width: 100%;
            background-color: var(--accent-color);
            color: white;
            border: none;
            padding: 0.8rem;
            border-radius: 5px;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-form button:hover, .comment-form button:hover {
            background-color: #0b7dda;
        }
        .site-footer {
            background-color: #2c3e50;
            color: white;
            padding: 3rem 2rem 1.5rem;
            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: 2rem;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 800;
            color: white;
            margin-bottom: 1rem;
            display: block;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
        }
        friend-link a {
            color: #4CAF50;
            text-decoration: none;
            transition: var(--transition);
        }
        friend-link a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #3a506b;
            color: #bdc3c7;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            .main-container {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            .main-nav {
                flex-direction: column;
                width: 100%;
                display: none;
                margin-top: 1rem;
            }
            .main-nav.active {
                display: flex;
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 1.2rem;
                right: 2rem;
            }
            .breadcrumb {
                padding: 0 1rem;
            }
            .main-container, .search-container {
                padding: 0 1rem;
            }
            .content-area {
                padding: 1.5rem;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .link-list ul {
                column-count: 1;
            }
        }
        @media (max-width: 480px) {
            .site-header {
                padding: 0.8rem 1rem;
            }
            .download-btn {
                padding: 0.8rem 1.5rem;
                font-size: 1rem;
            }
            .footer-container {
                grid-template-columns: 1fr;
            }
        }