:root {
            --primary-color: #6366f1;
            --secondary-color: #8b5cf6;
            --accent-color: #06b6d4;
            --dark-color: #1e293b;
            --light-color: #f8fafc;
            --gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8fafc;
            padding-top: 80px;
        }

        .navbar {
            background: var(--gradient);
            box-shadow: 0 2px 20px rgba(99, 102, 241, 0.1);
            padding: 1rem 0;
        }

        .navbar-brand {
            font-weight: bold;
            font-size: 1.5rem;
            color: white !important;
        }

        .navbar-nav .nav-link {
            color: rgba(255, 255, 255, 0.9) !important;
            font-weight: 500;
            margin: 0 0.5rem;
            transition: all 0.3s ease;
        }

        .navbar-nav .nav-link:hover {
            color: white !important;
            transform: translateY(-2px);
        }

        .article-hero {
            background: var(--gradient);
            color: white;
            padding: 3rem 0;
            margin-bottom: 2rem;
        }

        .article-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 1rem;
            line-height: 1.3;
        }

        .article-meta {
            display: flex;
            align-items: center;
            gap: 2rem;
            margin-bottom: 1.5rem;
            font-size: 0.95rem;
        }

        .meta-item {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            opacity: 0.9;
        }

        .breadcrumb {
            background: rgba(255, 255, 255, 0.1);
            border-radius: 10px;
            padding: 0.75rem 1rem;
            margin-bottom: 2rem;
        }

        .breadcrumb-item a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
        }

        .breadcrumb-item.active {
            color: white;
        }

        .article-content {
            background: white;
            border-radius: 20px;
            padding: 3rem;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            margin-bottom: 2rem;
        }

        .article-content h2 {
            color: var(--dark-color);
            font-weight: 600;
            margin: 2rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--primary-color);
        }

        .article-content h3 {
            color: var(--dark-color);
            font-weight: 600;
            margin: 1.5rem 0 1rem;
        }

        .article-content p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }

        .article-content ul, 
        .article-content ol {
            margin-bottom: 1.5rem;
            padding-left: 2rem;
        }

        .article-content li {
            margin-bottom: 0.5rem;
        }

        .code-block {
            background: #2d3748;
            border-radius: 10px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            overflow-x: auto;
        }

        .code-block pre {
            margin: 0;
            font-family: 'Fira Code', 'Monaco', 'Consolas', monospace;
        }

        .highlight-box {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 1.5rem;
            border-radius: 15px;
            margin: 2rem 0;
        }

        .highlight-box h4 {
            margin-bottom: 1rem;
            font-weight: 600;
        }

        .info-box {
            background: #e0f2fe;
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            border-radius: 0 10px 10px 0;
            margin: 2rem 0;
        }

        .warning-box {
            background: #fff3e0;
            border-left: 4px solid #ff9800;
            padding: 1.5rem;
            border-radius: 0 10px 10px 0;
            margin: 2rem 0;
        }

        .table-responsive {
            margin: 2rem 0;
        }

        .table {
            border-radius: 10px;
            overflow: hidden;
        }

        .table th {
            background: var(--gradient);
            color: white;
            border: none;
            font-weight: 600;
        }

        .article-tags {
            margin: 2rem 0;
        }

        .tag {
            display: inline-block;
            background: var(--gradient);
            color: white;
            padding: 0.4rem 1rem;
            border-radius: 20px;
            font-size: 0.875rem;
            font-weight: 500;
            margin: 0.25rem;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        .tag:hover {
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(99, 102, 241, 0.3);
        }

        .social-share {
            background: white;
            border-radius: 15px;
            padding: 2rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            margin-bottom: 2rem;
        }

        .share-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.5rem;
            border-radius: 25px;
            text-decoration: none;
            font-weight: 500;
            margin: 0.25rem;
            transition: all 0.3s ease;
        }

        .share-facebook { background: #1877f2; color: white; }
        .share-twitter { background: #1da1f2; color: white; }
        .share-linkedin { background: #0077b5; color: white; }
        .share-line { background: #00b900; color: white; }

        .share-btn:hover {
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }

        .related-articles {
            background: white;
            border-radius: 15px;
            padding: 2rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }

        .related-item {
            display: flex;
            gap: 1rem;
            padding: 1rem 0;
            border-bottom: 1px solid #f1f5f9;
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        .related-item:last-child {
            border-bottom: none;
        }

        .related-item:hover {
            background: #f8fafc;
            border-radius: 10px;
            margin: 0 -1rem;
            padding: 1rem;
        }

        .related-image {
            width: 80px;
            height: 80px;
            background: var(--gradient);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .related-image i {
            font-size: 1.5rem;
            color: white;
        }

        .related-info h6 {
            margin: 0 0 0.5rem;
            font-weight: 600;
            color: var(--dark-color);
            line-height: 1.3;
        }

        .related-info small {
            color: #666;
        }

        .toc {
            background: #f8fafc;
            border-radius: 15px;
            padding: 2rem;
            margin-bottom: 2rem;
            position: sticky;
            top: 100px;
        }

        .toc h5 {
            color: var(--dark-color);
            font-weight: 600;
            margin-bottom: 1rem;
        }

        .toc ul {
            list-style: none;
            padding: 0;
        }

        .toc li {
            margin-bottom: 0.5rem;
        }

        .toc a {
            color: #64748b;
            text-decoration: none;
            transition: all 0.3s ease;
            display: block;
            padding: 0.25rem 0;
        }

        .toc a:hover {
            color: var(--primary-color);
            padding-left: 0.5rem;
        }

        .ad-banner {
            background: #f0f0f0;
            border: 2px dashed #ccc;
            padding: 2rem;
            text-align: center;
            margin: 2rem 0;
            border-radius: 10px;
            color: #666;
            font-weight: 500;
        }

        .ad-sidebar {
            background: #f9f9f9;
            border: 2px dashed #ddd;
            padding: 1.5rem;
            text-align: center;
            margin-bottom: 2rem;
            border-radius: 10px;
            color: #777;
            min-height: 250px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .footer {
            background: var(--dark-color);
            color: white;
            padding: 3rem 0 2rem;
            margin-top: 4rem;
        }

        .footer-title {
            font-size: 1.25rem;
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--accent-color);
        }

        .footer-link {
            color: rgba(255, 255, 255, 0.7);
            text-decoration: none;
            transition: all 0.3s ease;
            display: block;
            margin-bottom: 0.5rem;
        }

        .footer-link:hover {
            color: var(--accent-color);
            padding-left: 0.5rem;
        }

        @media (max-width: 768px) {
            .article-title {
                font-size: 2rem;
            }
            
            .article-content {
                padding: 2rem;
            }
            
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 1rem;
            }
            
            .toc {
                position: static;
            }
        }

        /* Reading Progress Bar */
        .reading-progress {
            position: fixed;
            top: 0;
            left: 0;
            width: 0%;
            height: 3px;
            background: var(--gradient);
            z-index: 9999;
            transition: width 0.3s ease;
        }