:root {
            --primary: #2c5aa0;
            --secondary: #f4b41a;
            --accent: #e63946;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
            --border-radius: 10px;
            --max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: var(--light);
            overflow-x: hidden;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--border-radius);
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 1rem 0;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -1px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo a i {
            color: var(--secondary);
        }
        .logo a:hover {
            color: var(--accent);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--secondary);
            transition: var(--transition);
        }
        .main-nav a:hover:after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--primary);
            cursor: pointer;
        }
        .breadcrumb {
            background: linear-gradient(90deg, var(--light), #e9ecef);
            padding: 1rem 0;
            margin-bottom: 2rem;
            font-size: 0.95rem;
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        main {
            padding: 2rem 0 4rem;
            min-height: 80vh;
        }
        .article-header {
            text-align: center;
            margin-bottom: 3rem;
            padding-bottom: 2rem;
            border-bottom: 2px dashed var(--secondary);
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary);
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 2rem;
            color: var(--gray);
            font-size: 0.95rem;
            margin-top: 1.5rem;
        }
        .featured-img {
            margin: 3rem auto;
            max-width: 900px;
            box-shadow: var(--shadow);
            overflow: hidden;
        }
        .featured-img img {
            transition: transform 0.5s ease;
        }
        .featured-img:hover img {
            transform: scale(1.02);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            padding: 0.8rem;
            font-size: 0.9rem;
            background: #f8f9fa;
        }
        .content-area {
            max-width: 900px;
            margin: 0 auto;
        }
        .content-area p {
            margin-bottom: 1.8rem;
            font-size: 1.15rem;
            text-align: justify;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary);
            margin: 3rem 0 1.5rem;
            padding-bottom: 0.7rem;
            border-bottom: 2px solid var(--secondary);
        }
        h3 {
            font-size: 1.8rem;
            color: var(--dark);
            margin: 2.5rem 0 1.2rem;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--gray);
            margin: 2rem 0 1rem;
        }
        .highlight-box {
            background: linear-gradient(135deg, #e3f2fd, #f3e5f5);
            border-left: 5px solid var(--primary);
            padding: 2rem;
            margin: 2.5rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            box-shadow: var(--shadow);
        }
        .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .keyword-link {
            background: #fff3cd;
            color: #856404;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
            border: 1px dashed #ffc107;
        }
        .keyword-link:hover {
            background: #ffeaa7;
        }
        .interactive-module {
            background: white;
            border-radius: var(--border-radius);
            padding: 2.5rem;
            margin: 3rem 0;
            box-shadow: var(--shadow);
            border: 1px solid #dee2e6;
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 2rem;
            color: var(--primary);
        }
        .module-title i {
            font-size: 2rem;
            color: var(--secondary);
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.9rem 1.2rem;
            border: 2px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
            font-family: inherit;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 0.2rem rgba(44, 90, 160, 0.25);
        }
        .btn {
            display: inline-block;
            background: var(--primary);
            color: white;
            padding: 0.9rem 2.2rem;
            border-radius: 8px;
            border: none;
            font-weight: 600;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            background: #1d467a;
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
        }
        .btn-secondary {
            background: var(--secondary);
            color: var(--dark);
        }
        .btn-secondary:hover {
            background: #d39e00;
        }
        .stars {
            display: flex;
            gap: 10px;
            margin: 1rem 0;
        }
        .star {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover, .star.active {
            color: #ffc107;
        }
        .comment {
            background: #f8f9fa;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            margin-bottom: 1.5rem;
            border-left: 4px solid var(--primary);
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.8rem;
            font-size: 0.9rem;
            color: var(--gray);
        }
        footer {
            background: var(--dark);
            color: #adb5bd;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 3rem;
        }
        .footer-section h4 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.7rem;
        }
        .footer-section h4:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--secondary);
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #adb5bd;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.05);
            padding: 1.2rem;
            border-radius: var(--border-radius);
            margin-bottom: 1rem;
            border: 1px solid #495057;
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateX(5px);
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #495057;
            font-size: 0.9rem;
            color: #6c757d;
        }
        @media (max-width: 992px) {
            h1 {
                font-size: 2.4rem;
            }
            h2 {
                font-size: 2rem;
            }
            .main-nav ul {
                gap: 1.5rem;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: 85px;
                left: 0;
                width: 100%;
                background: white;
                box-shadow: var(--shadow);
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
                z-index: 999;
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .main-nav ul {
                flex-direction: column;
                padding: 2rem;
                gap: 0;
            }
            .main-nav li {
                width: 100%;
            }
            .main-nav a {
                display: block;
                padding: 1.2rem 0;
                border-bottom: 1px solid #eee;
            }
            .main-nav a:last-child {
                border-bottom: none;
            }
            .header-container {
                flex-wrap: wrap;
            }
            .article-meta {
                flex-direction: column;
                gap: 0.5rem;
            }
            .footer-container {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }
        @media (max-width: 576px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .interactive-module {
                padding: 1.5rem;
            }
            .container {
                padding: 0 15px;
            }
        }