:root {
            --primary: #4a6fa5;
            --secondary: #ff7b54;
            --accent: #6bc4b2;
            --light: #f8f9fa;
            --dark: #2d3748;
            --gray: #6c757d;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --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: 1.7;
            color: var(--dark);
            background-color: #fff;
            overflow-x: hidden;
        }
        .header {
            background: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
        }
        .logo:hover {
            color: var(--secondary);
        }
        .nav-desktop {
            display: flex;
            gap: 30px;
        }
        @media (max-width: 992px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-link {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            padding: 10px 5px;
            position: relative;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--secondary);
            transition: var(--transition);
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--primary);
            cursor: pointer;
        }
        @media (max-width: 992px) {
            .mobile-toggle {
                display: block;
            }
        }
        .mobile-nav {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background: white;
            padding: 20px;
            box-shadow: var(--shadow);
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
        }
        .mobile-nav.active {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }
        .mobile-nav .nav-link {
            display: block;
            padding: 15px 0;
            border-bottom: 1px solid #eee;
        }
        .breadcrumb {
            background: #f1f5f9;
            padding: 15px 0;
            margin-bottom: 30px;
        }
        .breadcrumb-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .breadcrumb-links {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
            font-size: 0.9rem;
        }
        .breadcrumb-links a {
            color: var(--gray);
            text-decoration: none;
        }
        .breadcrumb-links a:hover {
            color: var(--primary);
            text-decoration: underline;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 992px) {
            .container {
                grid-template-columns: 1fr;
            }
        }
        main {
            padding: 20px 0 50px;
        }
        .hero {
            text-align: center;
            padding: 40px 20px;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            border-radius: 15px;
            margin-bottom: 40px;
        }
        .hero h1 {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 20px;
            line-height: 1.2;
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.2rem;
            }
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
            color: var(--gray);
        }
        .search-box {
            max-width: 600px;
            margin: 30px auto;
            background: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .search-form {
            display: flex;
        }
        .search-input {
            flex: 1;
            padding: 15px;
            border: 2px solid #ddd;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
        }
        .search-input:focus {
            border-color: var(--primary);
        }
        .search-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-btn:hover {
            background: var(--secondary);
        }
        .content-section {
            margin-bottom: 50px;
        }
        h2 {
            color: var(--primary);
            margin-bottom: 25px;
            padding-bottom: 10px;
            border-bottom: 3px solid var(--accent);
            font-size: 2.2rem;
        }
        h3 {
            color: var(--dark);
            margin: 30px 0 15px;
            font-size: 1.6rem;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .highlight {
            background: #fff9e6;
            padding: 25px;
            border-left: 5px solid var(--secondary);
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat-card {
            background: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            text-align: center;
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--accent);
            margin-bottom: 15px;
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            display: block;
        }
        .stat-text {
            color: var(--gray);
            font-size: 1.1rem;
        }
        .image-container {
            margin: 30px 0;
            text-align: center;
        }
        .article-img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .article-img:hover {
            transform: scale(1.01);
        }
        .img-caption {
            margin-top: 10px;
            font-style: italic;
            color: var(--gray);
            font-size: 0.9rem;
        }
        .review-section {
            background: #f8f9fa;
            padding: 40px;
            border-radius: 15px;
            margin: 50px 0;
        }
        .rating-container {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }
        .stars {
            color: #ffc107;
            font-size: 1.5rem;
        }
        .rating-form, .comment-form {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin-bottom: 30px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        input, select, textarea {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.1);
        }
        .btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 14px 30px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            transition: var(--transition);
            display: inline-block;
            text-decoration: none;
        }
        .btn:hover {
            background: var(--secondary);
            transform: translateY(-2px);
        }
        aside {
            padding-top: 40px;
        }
        .sidebar-widget {
            background: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin-bottom: 30px;
        }
        .sidebar-widget h3 {
            font-size: 1.4rem;
            margin-top: 0;
            color: var(--primary);
        }
        .popular-puzzles {
            list-style: none;
        }
        .popular-puzzles li {
            padding: 12px 0;
            border-bottom: 1px solid #eee;
        }
        .popular-puzzles li:last-child {
            border-bottom: none;
        }
        .popular-puzzles a {
            color: var(--dark);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .popular-puzzles a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        .web-links-section {
            background: #f1f5f9;
            padding: 50px 0 30px;
            margin-top: 50px;
        }
        .web-links-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .web-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }
        .web-link {
            background: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
            transition: var(--transition);
        }
        .web-link:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .web-link a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            display: block;
        }
        .web-link a:hover {
            text-decoration: underline;
            color: var(--secondary);
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 50px 0 30px;
        }
        .footer-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            margin-bottom: 20px;
            display: block;
        }
        .footer-links a {
            color: #ccc;
            text-decoration: none;
            display: block;
            margin-bottom: 12px;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 30px;
            border-top: 1px solid #4a5568;
            color: #a0aec0;
            font-size: 0.9rem;
        }
        .text-bold {
            font-weight: 800;
            color: var(--primary);
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .text-center {
            text-align: center;
        }
        .mt-4 { margin-top: 2rem; }
        .mb-4 { margin-bottom: 2rem; }
        .py-4 { padding-top: 2rem; padding-bottom: 2rem; }