:root {
            --primary: #1a365d;
            --secondary: #c53030;
            --accent: #e2e8f0;
            --text: #2d3748;
            --light: #f7fafc;
            --gray: #718096;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Georgia', 'Times New Roman', serif;
            line-height: 1.8;
            color: var(--text);
            background-color: var(--light);
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        /* Header */
        header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .main-header {
            padding: 20px 0;
        }

        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
        }

        .logo-icon {
            font-size: 2.5rem;
            color: var(--secondary);
            margin-right: 10px;
        }

        .logo-text {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary);
        }

        .logo-text span {
            color: var(--secondary);
        }

        .nav-menu {
            display: flex;
            list-style: none;
            gap: 25px;
        }

        .nav-menu a {
            font-weight: 500;
            text-decoration: none;
            color: var(--text);
            position: relative;
        }

        .nav-menu a:hover {
            color: var(--secondary);
        }

        .nav-menu a:after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--secondary);
            left: 0;
            bottom: -5px;
            transition: var(--transition);
        }

        .nav-menu a:hover:after {
            width: 100%;
        }

        .mobile-toggle {
            display: none;
            width: 40px;
            height: 40px;
            background: var(--primary);
            border-radius: 4px;
            cursor: pointer;
            justify-content: center;
            align-items: center;
            transition: var(--transition);
        }

        .mobile-toggle:hover {
            background: var(--secondary);
        }

        .mobile-toggle i {
            color: white;
            font-size: 1.3rem;
        }

        /* Article Layout */
        .article-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin: 40px 0;
        }

        /* Main Article */
        .article-main {
            background: white;
            border-radius: 12px;
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        .article-header {
            padding: 40px 40px 20px;
        }

        .breadcrumb {
            margin-bottom: 20px;
            font-size: 0.9rem;
        }

        .breadcrumb a {
            color: var(--secondary);
            text-decoration: none;
        }

        .breadcrumb span {
            color: var(--gray);
        }

        .article-category {
            display: inline-block;
            background: var(--accent);
            color: var(--primary);
            padding: 5px 15px;
            border-radius: 25px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .article-title {
            font-size: 2.5rem;
            line-height: 1.2;
            margin-bottom: 20px;
            color: var(--primary);
        }

        .article-meta {
            display: flex;
            gap: 20px;
            color: var(--gray);
            font-size: 0.95rem;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--accent);
        }

        .article-meta i {
            color: var(--secondary);
            margin-right: 5px;
        }

        .article-meta a {
            color: var(--gray);
            text-decoration: none;
            transition: var(--transition);
        }

        .article-meta a:hover {
            color: var(--secondary);
        }

        .featured-image {
            width: 100%;
            height: auto;
            overflow: hidden;
        }

        .featured-image img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }

        .article-content {
            padding: 40px;
        }

        .article-content h2 {
            font-size: 1.8rem;
            margin: 40px 0 20px;
            color: var(--primary);
        }

        .article-content h2:first-of-type {
            margin-top: 0;
        }

        .article-content h3 {
            font-size: 1.4rem;
            margin: 30px 0 15px;
            color: var(--primary);
        }

        .article-content p {
            margin-bottom: 20px;
            font-size: 1.1rem;
        }

        .article-content ul, .article-content ol {
            margin: 20px 0 20px 40px;
        }

        .article-content li {
            margin-bottom: 10px;
            font-size: 1.1rem;
        }

        .article-content blockquote {
            background: var(--accent);
            border-left: 4px solid var(--secondary);
            padding: 20px 30px;
            margin: 30px 0;
            font-style: italic;
            border-radius: 0 8px 8px 0;
        }

        .article-content blockquote p {
            margin-bottom: 0;
        }

        .tip-box {
            background: #f0f4f8;
            border: 1px solid var(--accent);
            border-radius: 8px;
            padding: 25px;
            margin: 30px 0;
            border-left: 4px solid var(--secondary);
        }

        .tip-box h4 {
            color: var(--secondary);
            margin-bottom: 15px;
            font-size: 1.3rem;
        }

        .warning-box {
            background: #fff5f5;
            border: 1px solid #feb2b2;
            border-radius: 8px;
            padding: 25px;
            margin: 30px 0;
            border-left: 4px solid var(--secondary);
        }

        .warning-box h4 {
            color: var(--secondary);
            margin-bottom: 15px;
            font-size: 1.3rem;
        }

        .checklist {
            background: white;
            border: 2px solid var(--accent);
            border-radius: 8px;
            padding: 30px;
            margin: 30px 0;
        }

        .checklist h3 {
            margin-top: 0;
        }

        .checklist-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 15px;
        }

        .checklist-item i {
            color: var(--secondary);
            margin-right: 15px;
            margin-top: 5px;
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 40px 0 20px;
        }

        .tag {
            background: var(--accent);
            color: var(--primary);
            padding: 5px 15px;
            border-radius: 25px;
            font-size: 0.9rem;
        }

        /* Sidebar */
        .article-sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }

        .sidebar-widget {
            background: white;
            border-radius: 8px;
            box-shadow: var(--shadow);
            padding: 25px;
            margin-bottom: 30px;
        }

        .sidebar-widget h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent);
        }

        .table-of-contents {
            list-style: none;
        }

        .table-of-contents li {
            margin-bottom: 12px;
        }

        .table-of-contents a {
            color: var(--text);
            text-decoration: none;
            display: block;
            padding: 5px 0;
            border-bottom: 1px dashed var(--accent);
        }

        .table-of-contents a:hover {
            color: var(--secondary);
            padding-left: 10px;
        }

        .related-article {
            display: flex;
            gap: 15px;
            margin-bottom: 20px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--accent);
        }

        .related-article:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }

        .related-article img {
            width: 80px;
            height: 80px;
            border-radius: 4px;
            object-fit: cover;
        }

        .related-article h4 {
            font-size: 1rem;
            margin-bottom: 5px;
        }

        .related-article a {
            color: var(--text);
            text-decoration: none;
        }

        .related-article a:hover {
            color: var(--secondary);
        }

        /* Footer */
        footer {
            background-color: #0f1f3d;
            color: white;
            padding: 60px 0 30px;
            margin-top: 60px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-logo {
            font-size: 1.8rem;
            font-weight: bold;
            margin-bottom: 20px;
            color: white;
        }

        .footer-logo span {
            color: var(--secondary);
        }

        .footer-about p {
            margin-bottom: 20px;
            opacity: 0.8;
        }

        .footer-links h3, .footer-contact h3 {
            font-size: 1.3rem;
            margin-bottom: 25px;
            color: white;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-links h3:after, .footer-contact h3:after {
            content: '';
            position: absolute;
            width: 40px;
            height: 3px;
            background-color: var(--secondary);
            left: 0;
            bottom: 0;
        }

        .footer-links ul, .footer-contact ul {
            list-style: none;
        }

        .footer-links li, .footer-contact li {
            margin-bottom: 10px;
        }

        .footer-links a, .footer-contact a {
            color: white;
            opacity: 0.8;
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-links a:hover, .footer-contact a:hover {
            opacity: 1;
            color: var(--secondary);
            padding-left: 5px;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            opacity: 0.7;
        }

        /* Responsive */
        @media (max-width: 992px) {
            .article-wrapper {
                grid-template-columns: 1fr;
            }
            
            .article-sidebar {
                position: static;
            }
            
            .article-title {
                font-size: 2rem;
            }
            
            .nav-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: white;
                flex-direction: column;
                padding: 25px;
                box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
                border-top: 3px solid var(--secondary);
                gap: 0;
            }
            
            .nav-menu.active {
                display: flex;
            }
            
            .nav-menu li {
                margin: 0;
                width: 100%;
                border-bottom: 1px solid var(--accent);
            }
            
            .nav-menu li:last-child {
                border-bottom: none;
            }
            
            .nav-menu a {
                display: block;
                padding: 15px 10px;
                font-size: 1.1rem;
                font-weight: 500;
            }
            
            .nav-menu a:after {
                display: none;
            }
            
            .nav-menu a:hover {
                background-color: var(--accent);
                color: var(--secondary);
                padding-left: 20px;
            }
            
            .mobile-toggle {
                display: flex;
            }
        }

        @media (max-width: 768px) {
            .article-header {
                padding: 30px 20px;
            }
            
            .article-content {
                padding: 30px 20px;
            }
            
            .article-title {
                font-size: 1.8rem;
            }
            
            .article-meta {
                flex-direction: column;
                gap: 10px;
            }
        }