:root {
            --primary-color: #1a237e;
            --secondary-color: #e91e63;
            --accent-color: #4caf50;
            --light-bg: #f5f7ff;
            --dark-text: #222222;
            --light-text: #666666;
            --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;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--dark-text);
            background-color: #ffffff;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul {
            list-style: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary-color);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .logo span {
            color: var(--secondary-color);
        }
        .search-form {
            display: flex;
            flex: 0 1 400px;
        }
        .search-input {
            flex: 1;
            padding: 12px 18px;
            border: 2px solid var(--primary-color);
            border-radius: 30px 0 0 30px;
            font-size: 1rem;
            outline: none;
        }
        .search-btn {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 30px 30px 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .search-btn:hover {
            background: var(--secondary-color);
        }
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 0;
        }
        .main-nav ul {
            display: flex;
            gap: 30px;
        }
        .main-nav a {
            font-weight: 600;
            font-size: 1.05rem;
            padding: 8px 0;
            position: relative;
        }
        .main-nav a:hover {
            color: var(--secondary-color);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            transition: var(--transition);
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--primary-color);
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: var(--light-bg);
            font-size: 0.9rem;
            margin-bottom: 30px;
        }
        .breadcrumb a {
            color: var(--primary-color);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb i {
            margin: 0 8px;
            font-size: 0.8rem;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 30px 0;
        }
        .article-content h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 25px;
            color: var(--primary-color);
        }
        .article-meta {
            display: flex;
            gap: 20px;
            margin-bottom: 30px;
            color: var(--light-text);
            font-size: 0.95rem;
        }
        .article-meta i {
            margin-right: 6px;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: var(--primary-color);
            margin-bottom: 35px;
            padding: 20px;
            background-color: var(--light-bg);
            border-left: 5px solid var(--accent-color);
            border-radius: 5px;
        }
        h2, h3, h4 {
            margin-top: 40px;
            margin-bottom: 15px;
            color: var(--primary-color);
        }
        h2 {
            font-size: 2rem;
            border-bottom: 2px solid var(--border-color);
            padding-bottom: 10px;
        }
        h3 {
            font-size: 1.6rem;
            color: var(--secondary-color);
        }
        h4 {
            font-size: 1.3rem;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .highlight {
            background-color: #fff8e1;
            padding: 25px;
            border-radius: 10px;
            border-left: 5px solid #ffc107;
            margin: 30px 0;
        }
        .highlight p {
            margin-bottom: 0;
        }
        .stats-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat {
            background: var(--light-bg);
            padding: 20px;
            border-radius: 10px;
            text-align: center;
            box-shadow: var(--shadow);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--secondary-color);
            display: block;
        }
        .stat-label {
            font-size: 1rem;
            color: var(--light-text);
        }
        .image-container {
            margin: 30px 0;
            text-align: center;
        }
        .image-container img {
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin: 0 auto 15px;
        }
        .image-caption {
            font-style: italic;
            color: var(--light-text);
            font-size: 0.9rem;
        }
        blockquote {
            border-left: 5px solid var(--accent-color);
            padding-left: 25px;
            margin: 30px 0;
            font-style: italic;
            color: var(--light-text);
            background-color: var(--light-bg);
            padding: 25px;
            border-radius: 0 10px 10px 0;
        }
        .feature-list {
            margin: 25px 0;
            padding-left: 20px;
        }
        .feature-list li {
            margin-bottom: 12px;
            position: relative;
            padding-left: 30px;
        }
        .feature-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--accent-color);
            font-weight: bold;
            font-size: 1.2rem;
        }
        .interaction-section {
            background-color: var(--light-bg);
            padding: 30px;
            border-radius: 15px;
            margin: 40px 0;
        }
        .interaction-section h3 {
            margin-top: 0;
        }
        .rating-form, .comment-form {
            margin-top: 25px;
        }
        .stars {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
        }
        .star {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: #ffc107;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 14px;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            outline: none;
        }
        .btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-block;
        }
        .btn:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(233, 30, 99, 0.2);
        }
        .sidebar {
            position: sticky;
            top: 120px;
            align-self: start;
        }
        .sidebar-widget {
            background-color: var(--light-bg);
            padding: 25px;
            border-radius: 10px;
            margin-bottom: 30px;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            font-size: 1.4rem;
            margin-top: 0;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border-color);
        }
        .popular-links a {
            display: block;
            padding: 12px 0;
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .popular-links a:hover {
            color: var(--secondary-color);
            padding-left: 10px;
        }
        .popular-links a:last-child {
            border-bottom: none;
        }
        .tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag {
            background-color: white;
            padding: 8px 15px;
            border-radius: 30px;
            font-size: 0.9rem;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .tag:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        .long-tail-section {
            background-color: var(--light-bg);
            padding: 40px 0;
            margin: 50px 0;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
        }
        .web-link {
            background-color: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .web-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .web-link a {
            color: var(--primary-color);
            font-weight: 600;
            display: block;
        }
        .web-link a:hover {
            color: var(--secondary-color);
        }
        .footer {
            background-color: var(--primary-color);
            color: white;
            padding: 50px 0 20px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.4rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-section h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background-color: var(--secondary-color);
        }
        .footer-links a {
            display: block;
            padding: 8px 0;
            color: #cccccc;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 10px;
        }
        .social-icons {
            display: flex;
            gap: 20px;
            margin-top: 25px;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .social-icons a:hover {
            background-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        .copyright {
            text-align: center;
            padding-top: 25px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #aaaaaa;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                gap: 20px;
            }
            .search-form {
                width: 100%;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: 100px;
                left: 0;
                width: 100%;
                background-color: white;
                padding: 20px;
                box-shadow: var(--shadow);
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav li {
                width: 100%;
            }
            .main-nav a {
                display: block;
                padding: 15px 0;
                border-bottom: 1px solid var(--border-color);
            }
            .main-nav a::after {
                display: none;
            }
            .main-nav a:hover {
                background-color: var(--light-bg);
                padding-left: 15px;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .lead {
                font-size: 1.1rem;
            }
        }
        @media print {
            .header, .sidebar, .interaction-section, .long-tail-section, .footer {
                display: none;
            }
            .main-content {
                grid-template-columns: 1fr;
            }
            body {
                color: black;
                background: white;
            }
        }