:root {
            --primary: #4a6fa5; 
            --secondary: #ff9a3c; 
            --accent: #2ecc71; 
            --dark: #2c3e50;
            --light: #ecf0f1;
            --text: #333333;
            --gray: #95a5a6;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --radius: 12px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.7;
            color: var(--text);
            background-color: #f8f9fa;
            overflow-x: hidden;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        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 0;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        nav a {
            font-weight: 600;
            padding: 8px 0;
            position: relative;
        }
        nav a:after {
            content: '';
            position: absolute;
            width: 0;
            height: 3px;
            background: var(--secondary);
            left: 0;
            bottom: 0;
            transition: var(--transition);
        }
        nav a:hover:after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--dark);
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: var(--light);
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a.active {
            color: var(--primary);
            font-weight: 600;
        }
        .breadcrumb i {
            margin: 0 8px;
            color: var(--gray);
        }
        main {
            padding: 40px 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        article {
            background: white;
            border-radius: var(--radius);
            padding: 40px;
            box-shadow: var(--shadow);
        }
        h1 {
            color: var(--dark);
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 20px;
            border-bottom: 4px solid var(--secondary);
            padding-bottom: 15px;
        }
        h2 {
            color: var(--primary);
            font-size: 2rem;
            margin: 35px 0 20px;
            padding-top: 10px;
            border-top: 1px dashed var(--gray);
        }
        h3 {
            color: var(--dark);
            font-size: 1.5rem;
            margin: 25px 0 15px;
        }
        h4 {
            color: var(--dark);
            font-size: 1.2rem;
            margin: 20px 0 10px;
        }
        p {
            margin-bottom: 20px;
            font-size: 1.1rem;
        }
        strong {
            color: var(--dark);
            font-weight: 700;
        }
        .intro {
            font-size: 1.3rem;
            color: var(--dark);
            background: linear-gradient(90deg, var(--light) 0%, transparent 100%);
            padding: 20px;
            border-left: 5px solid var(--accent);
            margin-bottom: 30px;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .feature-img {
            margin: 30px auto;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            overflow: hidden;
        }
        .feature-img img:hover {
            transform: scale(1.02);
            transition: var(--transition);
        }
        .tip-box, .warning-box {
            padding: 20px;
            border-radius: var(--radius);
            margin: 25px 0;
            display: flex;
            align-items: flex-start;
            gap: 15px;
        }
        .tip-box {
            background-color: #e8f6ef;
            border-left: 5px solid var(--accent);
        }
        .warning-box {
            background-color: #ffefec;
            border-left: 5px solid #e74c3c;
        }
        .tip-box i, .warning-box i {
            font-size: 1.5rem;
            flex-shrink: 0;
        }
        .tip-box i { color: var(--accent); }
        .warning-box i { color: #e74c3c; }
        .link-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
            margin: 25px 0;
        }
        .link-list a {
            display: block;
            padding: 12px 20px;
            background: var(--light);
            border-radius: var(--radius);
            border: 1px solid #ddd;
            font-weight: 600;
        }
        .link-list a:hover {
            background: var(--primary);
            color: white;
            transform: translateY(-3px);
        }
        aside {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .widget {
            background: white;
            padding: 25px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .widget h3 {
            margin-top: 0;
            border-bottom: 2px solid var(--secondary);
            padding-bottom: 10px;
            font-size: 1.4rem;
        }
        .search-form {
            display: flex;
            margin-top: 15px;
        }
        .search-form input {
            flex: 1;
            padding: 12px 15px;
            border: 2px solid #ddd;
            border-radius: var(--radius) 0 0 var(--radius);
            font-size: 1rem;
        }
        .search-form button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0 20px;
            border-radius: 0 var(--radius) var(--radius) 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-form button:hover {
            background: var(--secondary);
        }
        .rating-widget form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .stars {
            display: flex;
            gap: 5px;
            font-size: 1.8rem;
            color: var(--gray);
            cursor: pointer;
            justify-content: center;
        }
        .stars i:hover,
        .stars i:hover ~ i {
            color: #ffc107;
        }
        .rating-widget input, .rating-widget textarea, .comment-form input, .comment-form textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: var(--radius);
            font-family: inherit;
        }
        .rating-widget button, .comment-form button {
            background: var(--accent);
            color: white;
            border: none;
            padding: 12px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-widget button:hover, .comment-form button:hover {
            background: #27ae60;
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 15px;
            color: white;
        }
        friend-link {
            display: block;
            margin-top: 20px;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 15px;
        }
        .friend-links a {
            color: var(--light);
            background: rgba(255,255,255,0.1);
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
        }
        .friend-links a:hover {
            background: var(--secondary);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: var(--gray);
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            h1 {
                font-size: 2.4rem;
            }
            article {
                padding: 30px;
            }
        }
        @media (max-width: 768px) {
            nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: white;
                box-shadow: var(--shadow);
                padding: 20px;
                gap: 15px;
            }
            nav ul.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .header-container {
                padding: 12px 0;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .intro {
                font-size: 1.1rem;
                padding: 15px;
            }
        }