:root {
            --primary: #0051ba;
            --secondary: #ff4747;
            --accent: #00a8e1;
            --dark: #121212;
            --light: #f8f9fa;
            --gray: #6c757d;
            --border: #dee2e6;
            --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;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--light);
            color: var(--dark);
            line-height: 1.6;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .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-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            border-bottom: 1px solid var(--border);
        }
        .logo {
            font-size: 2rem;
            font-weight: 900;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: -1px;
        }
        .logo span {
            color: var(--secondary);
        }
        .search-form {
            display: flex;
            flex: 0 1 400px;
        }
        .search-input {
            flex-grow: 1;
            padding: 10px 15px;
            border: 2px solid var(--primary);
            border-radius: var(--radius) 0 0 var(--radius);
            font-size: 1rem;
        }
        .search-btn {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 0 20px;
            border-radius: 0 var(--radius) var(--radius) 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-btn:hover {
            background-color: var(--secondary);
        }
        .mobile-toggle {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: var(--primary);
            cursor: pointer;
        }
        .nav {
            background-color: var(--dark);
        }
        .nav-list {
            display: flex;
            list-style: none;
        }
        .nav-item {
            position: relative;
        }
        .nav-link {
            display: block;
            padding: 15px 20px;
            color: white;
            font-weight: 600;
            text-transform: uppercase;
            font-size: 0.9rem;
            letter-spacing: 0.5px;
        }
        .nav-link:hover,
        .nav-item.active .nav-link {
            background-color: var(--primary);
            color: white;
        }
        .nav-link i {
            margin-right: 8px;
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: #e9ecef;
            font-size: 0.9rem;
        }
        .breadcrumb-list {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb-item + .breadcrumb-item::before {
            content: "/";
            padding: 0 10px;
            color: var(--gray);
        }
        .main-content {
            flex: 1;
            padding: 30px 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 30px;
        }
        .article {
            background-color: white;
            border-radius: var(--radius);
            padding: 30px;
            box-shadow: var(--shadow);
        }
        .article-header {
            margin-bottom: 30px;
            border-bottom: 2px solid var(--border);
            padding-bottom: 20px;
        }
        .article-title {
            font-size: 2.5rem;
            color: var(--dark);
            margin-bottom: 10px;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            gap: 20px;
            color: var(--gray);
            font-size: 0.9rem;
        }
        .article-meta i {
            margin-right: 5px;
        }
        .content-section {
            margin-bottom: 40px;
        }
        h2 {
            font-size: 1.8rem;
            color: var(--primary);
            margin: 25px 0 15px;
            padding-bottom: 8px;
            border-bottom: 1px dashed var(--accent);
        }
        h3 {
            font-size: 1.4rem;
            color: var(--dark);
            margin: 20px 0 12px;
        }
        p {
            margin-bottom: 18px;
            text-align: justify;
        }
        .highlight {
            background-color: #fff8e1;
            border-left: 4px solid #ffc107;
            padding: 15px;
            margin: 20px 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .step-box {
            background-color: var(--light);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px;
            margin: 20px 0;
        }
        .step-number {
            display: inline-block;
            background-color: var(--primary);
            color: white;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            text-align: center;
            line-height: 30px;
            margin-right: 10px;
            font-weight: bold;
        }
        ul, ol {
            padding-left: 25px;
            margin-bottom: 20px;
        }
        li {
            margin-bottom: 8px;
        }
        .image-container {
            margin: 25px 0;
            text-align: center;
        }
        .image-container img {
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 0 auto;
        }
        .image-caption {
            font-style: italic;
            color: var(--gray);
            margin-top: 10px;
            font-size: 0.9rem;
        }
        .related-links {
            background-color: #f1f8ff;
            padding: 20px;
            border-radius: var(--radius);
            margin: 25px 0;
        }
        .related-links h3 {
            color: var(--primary);
            margin-top: 0;
        }
        .link-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 10px;
        }
        .link-grid a {
            display: block;
            padding: 8px 12px;
            background-color: white;
            border-radius: 4px;
            border: 1px solid var(--border);
        }
        .link-grid a:hover {
            background-color: var(--primary);
            color: white;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 25px;
        }
        .widget {
            background-color: white;
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
        }
        .widget-title {
            font-size: 1.3rem;
            color: var(--primary);
            margin-bottom: 15px;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--accent);
        }
        .rating-form, .comment-form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .stars {
            display: flex;
            gap: 5px;
            font-size: 1.8rem;
            color: #ffc107;
            margin: 10px 0;
        }
        .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover {
            transform: scale(1.2);
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 5px;
        }
        .form-control {
            padding: 12px;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            font-size: 1rem;
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .btn {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 12px 20px;
            border-radius: var(--radius);
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            background-color: var(--secondary);
            transform: translateY(-2px);
        }
        .btn-block {
            width: 100%;
        }
        .comment-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 20px;
        }
        .comment {
            border-bottom: 1px solid var(--border);
            padding-bottom: 15px;
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
            color: var(--gray);
            font-size: 0.9rem;
        }
        .comment-author {
            font-weight: bold;
            color: var(--primary);
        }
        .footer {
            background-color: var(--dark);
            color: white;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 900;
            color: white;
            margin-bottom: 15px;
        }
        .footer-links h3 {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 15px;
        }
        .footer-links ul {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: #ccc;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.05);
            padding: 15px;
            border-radius: var(--radius);
            margin-top: 20px;
        }
        friend-link h3 {
            color: var(--accent);
            margin-bottom: 10px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            .article-title {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .header-top {
                flex-wrap: wrap;
            }
            .search-form {
                order: 3;
                flex: 1 0 100%;
                margin-top: 15px;
            }
            .mobile-toggle {
                display: block;
            }
            .nav-list {
                flex-direction: column;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease;
            }
            .nav-list.active {
                max-height: 500px;
            }
            .nav-link {
                padding: 12px 20px;
            }
            .article {
                padding: 20px;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }