:root {
            --primary: #4a6fa5; 
            --secondary: #ff9800; 
            --accent: #2ecc71; 
            --dark: #2c3e50;
            --light: #ecf0f1;
            --gray: #7f8c8d;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --radius: 8px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f9f9f9;
            overflow-x: hidden;
        }
        .header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo-icon {
            color: var(--secondary);
            font-size: 2rem;
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            font-size: 1rem;
            padding: 0.5rem 0;
            position: relative;
            transition: var(--transition);
        }
        .nav-desktop a:hover {
            color: var(--primary);
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--secondary);
            transition: width 0.3s ease;
        }
        .nav-desktop a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--dark);
            cursor: pointer;
            padding: 5px;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .nav-mobile {
            position: fixed;
            top: 80px;
            left: 0;
            width: 100%;
            background-color: white;
            box-shadow: var(--shadow);
            padding: 20px;
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
        }
        .nav-mobile.active {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }
        .nav-mobile a {
            display: block;
            padding: 12px 0;
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            border-bottom: 1px solid #eee;
        }
        .nav-mobile a:last-child {
            border-bottom: none;
        }
        .breadcrumb {
            max-width: 1200px;
            margin: 20px auto;
            padding: 0 20px;
            font-size: 0.9rem;
            color: var(--gray);
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .search-container {
            max-width: 1200px;
            margin: 30px auto;
            padding: 0 20px;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-input {
            flex: 1;
            padding: 15px 20px;
            border: 2px solid #ddd;
            border-right: none;
            border-radius: var(--radius) 0 0 var(--radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-input:focus {
            outline: none;
            border-color: var(--primary);
        }
        .search-button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 var(--radius) var(--radius) 0;
            cursor: pointer;
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-button:hover {
            background-color: #3a5a8c;
        }
        .main-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 992px) {
            .main-container {
                grid-template-columns: 1fr;
            }
        }
        .content-area {
            background-color: white;
            padding: 40px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .article-title {
            color: var(--dark);
            font-size: 2.5rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .article-meta {
            color: var(--gray);
            font-size: 0.95rem;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 1px solid #eee;
            display: flex;
            gap: 20px;
        }
        .article-meta span i {
            margin-right: 5px;
        }
        h2 {
            color: var(--primary);
            font-size: 1.8rem;
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light);
        }
        h3 {
            color: var(--dark);
            font-size: 1.4rem;
            margin: 30px 0 15px;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .highlight {
            background-color: #fff9e6;
            border-left: 4px solid var(--secondary);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .highlight p:last-child {
            margin-bottom: 0;
        }
        .tip-box {
            background-color: #e8f4fd;
            border: 1px solid #b6e0ff;
            padding: 20px;
            border-radius: var(--radius);
            margin: 25px 0;
        }
        .tip-title {
            color: var(--primary);
            font-weight: 700;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat-card {
            background: linear-gradient(135deg, var(--primary), #6a8cc5);
            color: white;
            padding: 25px 20px;
            border-radius: var(--radius);
            text-align: center;
            box-shadow: var(--shadow);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 5px;
        }
        .stat-label {
            font-size: 0.9rem;
            opacity: 0.9;
        }
        .image-container {
            margin: 40px 0;
            text-align: center;
        }
        .article-image {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .image-caption {
            font-size: 0.9rem;
            color: var(--gray);
            margin-top: 10px;
            font-style: italic;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background-color: white;
            padding: 25px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .widget-title {
            color: var(--dark);
            font-size: 1.3rem;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light);
        }
        .rating-container {
            text-align: center;
        }
        .rating-stars {
            font-size: 2rem;
            color: #ffc107;
            margin: 15px 0;
        }
        .rating-stars .far {
            color: #ddd;
        }
        .rating-form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .rating-select {
            padding: 10px;
            border-radius: var(--radius);
            border: 1px solid #ddd;
            font-size: 1rem;
        }
        .rating-button {
            background-color: var(--accent);
            color: white;
            border: none;
            padding: 12px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-button:hover {
            background-color: #27ae60;
        }
        .comments-section {
            margin-top: 60px;
            padding-top: 40px;
            border-top: 2px solid var(--light);
        }
        .comment-form {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-bottom: 40px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .form-input, .form-textarea {
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: var(--radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-input:focus, .form-textarea:focus {
            outline: none;
            border-color: var(--primary);
        }
        .form-textarea {
            min-height: 150px;
            resize: vertical;
        }
        .form-button {
            align-self: flex-start;
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .form-button:hover {
            background-color: #3a5a8c;
        }
        .comment {
            background-color: #f8f9fa;
            padding: 25px;
            border-radius: var(--radius);
            margin-bottom: 25px;
            border-left: 4px solid var(--primary);
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 15px;
            flex-wrap: wrap;
            gap: 10px;
        }
        .comment-author {
            font-weight: 700;
            color: var(--dark);
        }
        .comment-date {
            color: var(--gray);
            font-size: 0.9rem;
        }
        .long-tail-links {
            max-width: 1200px;
            margin: 60px auto 30px;
            padding: 0 20px;
        }
        .web-link {
            display: inline-block;
            background-color: white;
            padding: 15px 25px;
            margin: 0 15px 15px 0;
            border-radius: 50px;
            box-shadow: var(--shadow);
            text-decoration: none;
            color: var(--primary);
            font-weight: 600;
            transition: var(--transition);
        }
        .web-link:hover {
            background-color: var(--primary);
            color: white;
            transform: translateY(-3px);
        }
        .footer {
            background-color: var(--dark);
            color: white;
            padding: 60px 20px 30px;
            margin-top: 60px;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 20px;
            color: white;
        }
        .footer-about {
            color: #bdc3c7;
            line-height: 1.6;
        }
        .footer-links h4, .footer-contact h4 {
            font-size: 1.2rem;
            margin-bottom: 25px;
            color: white;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary);
            padding-left: 5px;
        }
        .footer-contact p {
            margin-bottom: 15px;
            color: #bdc3c7;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #34495e;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .header-container {
                height: 70px;
                padding: 0 15px;
            }
            .article-title {
                font-size: 2rem;
            }
            .content-area, .sidebar-widget {
                padding: 25px 20px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .main-container {
                padding: 15px;
                gap: 30px;
            }
            .breadcrumb, .search-container, .long-tail-links {
                padding: 0 15px;
            }
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .bold {
            font-weight: 700;
            color: var(--dark);
        }
        .keyword {
            background-color: #eef7ff;
            padding: 2px 6px;
            border-radius: 4px;
            font-weight: 600;
            color: var(--primary);
        }