:root {
            --primary: #3498db;
            --secondary: #2c3e50;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --text: #34495e;
            --gray: #95a5a6;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --radius: 8px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: var(--text);
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: var(--secondary);
            color: white;
            padding: 1.5rem 0;
            border-radius: 0 0 var(--radius) var(--radius);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--accent);
            animation: rotate 4s linear infinite;
        }
        @keyframes rotate {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .logo:hover {
            color: var(--primary);
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        nav {
            display: flex;
            gap: 2rem;
            align-items: center;
        }
        .nav-links {
            display: flex;
            gap: 1.8rem;
            list-style: none;
        }
        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
            transition: var(--transition);
            position: relative;
        }
        .nav-links a:hover {
            background: var(--primary);
            transform: translateY(-3px);
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 50%;
            width: 0;
            height: 3px;
            background: var(--accent);
            transition: var(--transition);
            transform: translateX(-50%);
        }
        .nav-links a:hover::after {
            width: 80%;
        }
        .search-box {
            display: flex;
            background: white;
            border-radius: 50px;
            overflow: hidden;
            padding: 0.3rem;
        }
        .search-box input {
            border: none;
            padding: 0.7rem 1rem;
            width: 220px;
            outline: none;
        }
        .search-box button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0.7rem 1.5rem;
            border-radius: 50px;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-box button:hover {
            background: var(--accent);
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: var(--gray);
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        h1 {
            color: var(--secondary);
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.3;
            border-left: 6px solid var(--accent);
            padding-left: 1rem;
        }
        h2 {
            color: var(--secondary);
            margin: 2.5rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--light);
        }
        h3 {
            color: var(--primary);
            margin: 1.8rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.2rem;
            background: linear-gradient(to right, #e3f2fd, #f3e5f5);
            padding: 1.5rem;
            border-radius: var(--radius);
            margin-bottom: 2rem;
            border-left: 4px solid var(--primary);
        }
        .highlight {
            background: #fffacd;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .feature-img {
            width: 100%;
            border-radius: var(--radius);
            margin: 2rem 0;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            transition: transform 0.5s ease;
        }
        .feature-img:hover {
            transform: scale(1.02);
        }
        .stats-box {
            background: var(--light);
            padding: 1.5rem;
            border-radius: var(--radius);
            margin: 2rem 0;
            border-left: 5px solid var(--primary);
        }
        .stats-box h3 {
            margin-top: 0;
        }
        .tip {
            background: #e8f5e9;
            border-left: 5px solid #4CAF50;
            padding: 1.2rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .tip i {
            color: #4CAF50;
            margin-right: 10px;
        }
        .link-natural {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            border-bottom: 2px dotted var(--primary);
            transition: var(--transition);
        }
        .link-natural:hover {
            color: var(--accent);
            border-bottom-style: solid;
        }
        .emoji {
            font-size: 1.2em;
            margin: 0 3px;
        }
        blockquote {
            border-left: 4px solid var(--accent);
            padding-left: 1.5rem;
            margin: 2rem 0;
            font-style: italic;
            color: var(--gray);
            background: #f9f9f9;
            padding: 1.5rem;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        aside {
            background: white;
            padding: 1.8rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            height: fit-content;
            position: sticky;
            top: 120px;
        }
        .sidebar-section {
            margin-bottom: 2rem;
        }
        .sidebar-section h3 {
            color: var(--secondary);
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--light);
        }
        .quick-links {
            list-style: none;
        }
        .quick-links li {
            margin-bottom: 0.8rem;
        }
        .quick-links a {
            color: var(--text);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 0.7rem;
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .quick-links a:hover {
            background: var(--light);
            color: var(--primary);
            transform: translateX(5px);
        }
        .quick-links i {
            color: var(--primary);
        }
        .rating-widget {
            text-align: center;
            padding: 1.5rem;
            background: #f8f9fa;
            border-radius: var(--radius);
        }
        .stars {
            font-size: 1.8rem;
            color: #f1c40f;
            margin: 1rem 0;
            cursor: pointer;
        }
        .stars i:hover {
            transform: scale(1.2);
        }
        .comment-section {
            background: white;
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 3rem 0;
        }
        .comment-form textarea {
            width: 100%;
            padding: 1rem;
            border: 1px solid #ddd;
            border-radius: var(--radius);
            margin-bottom: 1rem;
            font-family: inherit;
            resize: vertical;
            min-height: 120px;
        }
        .comment-form button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: var(--radius);
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .comment-form button:hover {
            background: var(--secondary);
        }
        .comment {
            border-bottom: 1px solid #eee;
            padding: 1.5rem 0;
        }
        .comment:last-child {
            border-bottom: none;
        }
        .comment-author {
            font-weight: bold;
            color: var(--secondary);
        }
        .comment-date {
            color: var(--gray);
            font-size: 0.9rem;
        }
        .footer-links {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 1.5rem;
            margin: 3rem 0 2rem;
        }
        @media (max-width: 768px) {
            .footer-links {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        .web-link {
            background: white;
            padding: 1.2rem;
            border-radius: var(--radius);
            box-shadow: 0 3px 8px rgba(0,0,0,0.08);
            transition: var(--transition);
        }
        .web-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 15px rgba(0,0,0,0.1);
        }
        .web-link a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            display: block;
            text-align: center;
            line-height: 1.5;
        }
        .web-link a:hover {
            color: var(--accent);
        }
        footer {
            background: var(--secondary);
            color: white;
            padding: 2.5rem 0;
            text-align: center;
            border-radius: var(--radius) var(--radius) 0 0;
            margin-top: 3rem;
        }
        .copyright {
            margin-top: 1.5rem;
            color: #bdc3c7;
            font-size: 0.95rem;
        }
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            .mobile-toggle {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 20px;
            }
            nav {
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                margin-top: 1rem;
                display: none;
            }
            nav.active {
                display: flex;
            }
            .nav-links {
                flex-direction: column;
                width: 100%;
                gap: 0;
            }
            .nav-links li {
                width: 100%;
            }
            .nav-links a {
                display: block;
                padding: 1rem;
                border-radius: 0;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .search-box {
                width: 100%;
                margin-top: 1rem;
            }
            .search-box input {
                width: 100%;
            }
            h1 {
                font-size: 2.2rem;
            }
            .article-content {
                padding: 1.5rem;
            }
            .footer-links {
                grid-template-columns: 1fr;
            }
        }