:root {
            --primary: #1a237e;
            --secondary: #ff5722;
            --accent: #4caf50;
            --light: #f5f5f5;
            --dark: #212121;
            --gray: #757575;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --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: #f8f9fa;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--primary), #283593);
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
        }
        .logo span {
            background: linear-gradient(to right, #ffeb3b, var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        .nav-links a {
            font-weight: 600;
            font-size: 1.05rem;
            padding: 8px 5px;
            position: relative;
        }
        .nav-links a:hover {
            color: var(--secondary);
        }
        .nav-links a:after {
            content: '';
            position: absolute;
            width: 0;
            height: 3px;
            bottom: 0;
            left: 0;
            background-color: var(--secondary);
            transition: var(--transition);
        }
        .nav-links a:hover:after {
            width: 100%;
        }
        .search-box {
            margin-left: 30px;
            display: flex;
            background: rgba(255,255,255,0.15);
            border-radius: 30px;
            padding: 8px 15px;
            align-items: center;
        }
        .search-box input {
            background: transparent;
            border: none;
            color: white;
            padding: 5px 10px;
            width: 200px;
            outline: none;
        }
        .search-box input::placeholder {
            color: rgba(255,255,255,0.7);
        }
        .search-box button {
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: #edf2f7;
            font-size: 0.95rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 10px;
        }
        .breadcrumb li:not(:last-child):after {
            content: '/';
            margin-left: 10px;
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }
        main {
            padding: 40px 0;
        }
        article {
            background: white;
            border-radius: 12px;
            padding: 40px;
            box-shadow: var(--shadow);
            margin-bottom: 40px;
        }
        h1 {
            color: var(--primary);
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 20px;
            border-bottom: 4px solid var(--secondary);
            padding-bottom: 15px;
        }
        h2 {
            color: var(--primary);
            font-size: 2rem;
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e0e0e0;
        }
        h3 {
            color: #444;
            font-size: 1.5rem;
            margin: 30px 0 15px;
        }
        p {
            margin-bottom: 20px;
            font-size: 1.1rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: var(--dark);
            background: #f0f7ff;
            padding: 20px;
            border-left: 5px solid var(--secondary);
            border-radius: 0 8px 8px 0;
            margin-bottom: 30px;
        }
        .highlight {
            background: linear-gradient(120deg, #e1f5fe 0%, #e1f5fe 100%);
            padding: 25px;
            border-radius: 10px;
            border: 1px dashed #4fc3f7;
            margin: 30px 0;
        }
        .highlight strong {
            color: var(--primary);
            font-size: 1.2rem;
        }
        .emoji {
            font-size: 1.3em;
            margin-right: 8px;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            box-shadow: var(--shadow);
            display: block;
            margin: 30px auto;
            border: 1px solid #ddd;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: -20px;
            margin-bottom: 30px;
        }
        ul, ol {
            margin-left: 25px;
            margin-bottom: 25px;
        }
        li {
            margin-bottom: 10px;
        }
        a.keyword-link {
            color: var(--secondary);
            font-weight: 600;
            border-bottom: 1px dotted var(--secondary);
        }
        a.keyword-link:hover {
            color: var(--primary);
            border-bottom-style: solid;
        }
        blockquote {
            border-left: 5px solid var(--accent);
            padding-left: 25px;
            margin: 30px 0;
            font-style: italic;
            color: #555;
            background: #f9f9f9;
            padding: 20px 25px;
            border-radius: 0 8px 8px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
            margin: 40px 0;
        }
        .stat-card {
            background: linear-gradient(145deg, #ffffff, #f0f0f0);
            padding: 25px;
            border-radius: 12px;
            text-align: center;
            box-shadow: var(--shadow);
            border-top: 5px solid var(--accent);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--accent);
            margin-bottom: 15px;
        }
        .stat-card h4 {
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 10px;
        }
        .interactive-section {
            background: #f8f9fa;
            border-radius: 12px;
            padding: 30px;
            margin: 40px 0;
            border: 2px solid #e9ecef;
        }
        .interactive-section h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .rating-stars {
            display: flex;
            gap: 5px;
            margin: 15px 0;
        }
        .rating-stars i {
            color: #ffc107;
            cursor: pointer;
            font-size: 1.8rem;
            transition: var(--transition);
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }
        form {
            display: grid;
            gap: 20px;
            margin-top: 25px;
        }
        input, textarea, select {
            padding: 15px;
            border: 1px solid #ccc;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--secondary);
            box-shadow: 0 0 0 3px rgba(255, 87, 34, 0.2);
        }
        button, .btn {
            background: linear-gradient(to right, var(--primary), var(--secondary));
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        button:hover, .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(0,0,0,0.2);
        }
        footer {
            background: var(--dark);
            color: #ccc;
            padding: 50px 0 20px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h4 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--secondary);
        }
        .friend-links {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
        }
        .friend-links a {
            display: block;
            padding: 10px 15px;
            background: rgba(255,255,255,0.05);
            border-radius: 6px;
            border-left: 3px solid transparent;
        }
        .friend-links a:hover {
            background: rgba(255,255,255,0.1);
            border-left-color: var(--secondary);
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #444;
            font-size: 0.95rem;
            color: #aaa;
        }
        @media (max-width: 992px) {
            .nav-links, .search-box {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .mobile-nav {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background: var(--primary);
                flex-direction: column;
                padding: 20px;
                box-shadow: var(--shadow);
                display: none;
                z-index: 999;
            }
            .mobile-nav.active {
                display: flex;
            }
            .mobile-nav .search-box {
                display: flex;
                width: 100%;
                margin: 20px 0 0;
            }
            .mobile-nav .search-box input {
                width: 100%;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            article {
                padding: 25px;
            }
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }