:root {
            --primary-green: #2ecc71;
            --secondary-blue: #3498db;
            --accent-orange: #e67e22;
            --dark-bg: #2c3e50;
            --light-bg: #ecf0f1;
            --text-dark: #2c3e50;
            --text-light: #f5f7fa;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background-color: #f9f9f9;
            color: var(--text-dark);
            line-height: 1.7;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--dark-bg) 0%, #1a2530 100%);
            color: var(--text-light);
            padding: 1.5rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            text-decoration: none;
            color: var(--primary-green);
            text-transform: uppercase;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
        }
        .my-logo i {
            color: var(--accent-orange);
            margin-right: 10px;
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .desktop-nav a {
            color: var(--text-light);
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .desktop-nav a:hover, .desktop-nav a.active {
            background-color: var(--primary-green);
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background-color: var(--dark-bg);
            flex-direction: column;
            padding: 1rem 0;
            box-shadow: var(--shadow);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav a {
            color: var(--text-light);
            text-decoration: none;
            padding: 1rem 2rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            transition: background-color 0.3s;
        }
        .mobile-nav a:hover {
            background-color: var(--primary-green);
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: var(--light-bg);
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '>';
            margin: 0 10px;
            color: #7f8c8d;
        }
        .breadcrumb a {
            color: var(--secondary-blue);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: var(--shadow);
        }
        .article-content h1 {
            color: var(--dark-bg);
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid var(--primary-green);
            padding-bottom: 0.5rem;
        }
        .article-content h2 {
            color: var(--secondary-blue);
            font-size: 2rem;
            margin: 2.5rem 0 1.2rem;
            padding-top: 1rem;
        }
        .article-content h3 {
            color: var(--accent-orange);
            font-size: 1.5rem;
            margin: 2rem 0 1rem;
        }
        .article-content h4 {
            color: #27ae60;
            font-size: 1.2rem;
            margin: 1.5rem 0 0.8rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .article-content img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 1.5rem auto;
            display: block;
            box-shadow: var(--shadow);
            border: 3px solid var(--light-bg);
        }
        .highlight-box {
            background-color: #e8f4fc;
            border-left: 5px solid var(--secondary-blue);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .tip {
            background-color: #fff8e1;
            border-left: 5px solid #ffc107;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 5px 5px 0;
        }
        .link-list {
            background: var(--light-bg);
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
        }
        .link-list ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
        }
        .link-list a {
            color: var(--secondary-blue);
            text-decoration: none;
            display: flex;
            align-items: center;
            padding: 0.5rem;
            border-radius: 4px;
            transition: background 0.3s;
        }
        .link-list a:hover {
            background: rgba(52, 152, 219, 0.1);
            text-decoration: underline;
        }
        .link-list i {
            margin-right: 10px;
            color: var(--accent-orange);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .widget {
            background: white;
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: var(--shadow);
        }
        .widget h3 {
            color: var(--dark-bg);
            font-size: 1.3rem;
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--primary-green);
        }
        .search-form input, .comment-form input, .comment-form textarea, .rating-form select {
            width: 100%;
            padding: 12px 15px;
            margin-bottom: 1rem;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .search-form input:focus, .comment-form input:focus, .comment-form textarea:focus, .rating-form select:focus {
            border-color: var(--primary-green);
            outline: none;
        }
        .btn {
            background: linear-gradient(to right, var(--primary-green), #27ae60);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.3s, box-shadow 0.3s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(46, 204, 113, 0.3);
        }
        .btn i {
            margin-right: 8px;
        }
        .stars {
            color: #ffc107;
            font-size: 1.5rem;
            margin: 0.5rem 0;
        }
        .update-time {
            background-color: #fff3cd;
            color: #856404;
            padding: 1rem;
            border-radius: 8px;
            text-align: center;
            font-weight: 600;
            margin-top: 2rem;
        }
        footer {
            background-color: var(--dark-bg);
            color: var(--text-light);
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
        }
        friend-link a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }
        friend-link a:hover {
            color: var(--primary-green);
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #95a5a6;
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .article-content {
                padding: 1.5rem;
            }
            .article-content h1 {
                font-size: 2.2rem;
            }
            .article-content h2 {
                font-size: 1.7rem;
            }
            .header-container, .footer-content {
                flex-direction: column;
                text-align: center;
            }
        }