:root {
            --primary-dark: #0a2a4a;
            --primary-blue: #1a5b92;
            --accent-gold: #ffcc00;
            --accent-green: #2ecc71;
            --neutral-light: #f8f9fa;
            --neutral-mid: #e9ecef;
            --neutral-dark: #212529;
            --text-primary: #333;
            --text-secondary: #555;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --border-radius: 12px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            --max-width: 1200px;
        }
        * {
            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: var(--text-primary);
            background: linear-gradient(135deg, var(--neutral-light) 0%, #ffffff 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .site-header {
            background: linear-gradient(to right, var(--primary-dark), var(--primary-blue));
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }
        .my-logo {
            font-family: 'Trebuchet MS', sans-serif;
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-gold);
            text-decoration: none;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .my-logo:hover {
            transform: scale(1.03);
            text-shadow: 0 0 8px rgba(255, 204, 0, 0.5);
        }
        .my-logo i {
            font-size: 2rem;
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
            transition: var(--transition);
        }
        .nav-desktop a:hover {
            color: var(--accent-gold);
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--accent-gold);
            transition: width 0.3s ease;
        }
        .nav-desktop a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: var(--primary-dark);
            padding: 1.5rem;
            position: absolute;
            top: 80px;
            left: 0;
            width: 100%;
            box-shadow: var(--shadow);
            z-index: 999;
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: white;
            text-decoration: none;
            padding: 1rem 0;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            font-weight: 600;
            transition: var(--transition);
        }
        .nav-mobile a:hover {
            color: var(--accent-gold);
            padding-left: 10px;
        }
        .breadcrumb {
            background: var(--neutral-mid);
            padding: 1rem 1.5rem;
            font-size: 0.9rem;
            border-bottom: 1px solid #ddd;
        }
        .breadcrumb ol {
            max-width: var(--max-width);
            margin: 0 auto;
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
        }
        .breadcrumb a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: var(--transition);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .separator {
            margin: 0 0.5rem;
            color: #888;
        }
        .main-container {
            max-width: var(--max-width);
            margin: 2rem auto;
            padding: 0 1.5rem;
            flex: 1;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        @media (max-width: 992px) {
            .main-container {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }
        .article-content {
            background: white;
            border-radius: var(--border-radius);
            padding: 2.5rem;
            box-shadow: var(--shadow);
        }
        .article-header {
            margin-bottom: 2.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 2px solid var(--neutral-mid);
        }
        .article-header h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            color: var(--primary-dark);
            margin-bottom: 1rem;
        }
        .meta-info {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            color: var(--text-secondary);
            font-size: 0.95rem;
        }
        .meta-info i {
            margin-right: 0.5rem;
            color: var(--primary-blue);
        }
        .content-section {
            margin-bottom: 3rem;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-blue);
            margin: 2rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent-gold);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--primary-dark);
            margin: 1.8rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #444;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            color: var(--text-primary);
        }
        .highlight-box {
            background: linear-gradient(to right, rgba(26, 91, 146, 0.05), rgba(255, 204, 0, 0.05));
            border-left: 4px solid var(--accent-gold);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .feature-card {
            background: var(--neutral-light);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            border-top: 4px solid var(--primary-blue);
            transition: var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        .feature-card h4 {
            color: var(--primary-blue);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feature-card i {
            color: var(--accent-gold);
        }
        .article-image {
            width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            margin: 2rem 0;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .article-image:hover {
            transform: scale(1.005);
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
        }
        .interactive-module {
            background: var(--neutral-light);
            border-radius: var(--border-radius);
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid var(--neutral-mid);
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 1.5rem;
            color: var(--primary-dark);
        }
        .module-title i {
            color: var(--accent-green);
            font-size: 1.8rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--primary-dark);
        }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 2px solid var(--neutral-mid);
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(26, 91, 146, 0.2);
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
            font-size: 1.8rem;
            color: #ddd;
        }
        .rating-stars .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-stars .star:hover,
        .rating-stars .star.active {
            color: var(--accent-gold);
        }
        .btn {
            background: linear-gradient(to right, var(--primary-blue), var(--primary-dark));
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.7rem;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(26, 91, 146, 0.4);
        }
        .btn-accent {
            background: linear-gradient(to right, var(--accent-gold), #e6b800);
            color: var(--primary-dark);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background: white;
            border-radius: var(--border-radius);
            padding: 1.8rem;
            box-shadow: var(--shadow);
        }
        .widget-title {
            font-size: 1.4rem;
            color: var(--primary-dark);
            margin-bottom: 1.5rem;
            padding-bottom: 0.7rem;
            border-bottom: 2px solid var(--neutral-mid);
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }
        .widget-title i {
            color: var(--primary-blue);
        }
        .related-links {
            list-style: none;
        }
        .related-links li {
            margin-bottom: 1rem;
        }
        .related-links a {
            color: var(--text-primary);
            text-decoration: none;
            padding: 0.8rem;
            display: block;
            border-radius: 8px;
            transition: var(--transition);
            border-left: 3px solid transparent;
        }
        .related-links a:hover {
            background: var(--neutral-light);
            border-left-color: var(--accent-gold);
            padding-left: 1.2rem;
        }
        .link-date {
            display: block;
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-top: 0.3rem;
        }
        .site-footer {
            background: var(--primary-dark);
            color: white;
            padding: 3rem 1.5rem 2rem;
            margin-top: 4rem;
        }
        .footer-container {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
        }
        .footer-section h3 {
            color: var(--accent-gold);
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #ccc;
            text-decoration: none;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 0.7rem;
        }
        .footer-links a:hover {
            color: var(--accent-gold);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 1rem;
            border-radius: 8px;
            margin-bottom: 1rem;
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(255,255,255,0.1);
        }
        friend-link a {
            color: white !important;
            text-decoration: none !important;
            display: flex !important;
            align-items: center !important;
            gap: 0.8rem !important;
        }
        .copyright {
            max-width: var(--max-width);
            margin: 3rem auto 0;
            padding-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            html {
                font-size: 15px;
            }
            .header-container {
                height: 70px;
                padding: 0 1rem;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
            .article-content {
                padding: 1.8rem;
            }
            .main-container {
                padding: 0 1rem;
                margin: 1.5rem auto;
            }
            .feature-list {
                grid-template-columns: 1fr;
            }
            .sidebar {
                order: -1;
            }
        }