* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #2a7de1; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #1a5cb0; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(90deg, #1a2a3a, #2c3e50);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(45deg, #00d4ff, #0088ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: 1px;
        }
        .my-logo a { background: none; }
        nav ul { display: flex; list-style: none; }
        nav ul li { margin-left: 2rem; }
        nav ul li a {
            color: #ecf0f1;
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
        }
        nav ul li a:hover {
            color: #00d4ff;
            border-bottom-color: #00d4ff;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 1rem 0;
            background: #f8f9fa;
            border-bottom: 1px solid #dee2e6;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #6c757d; }
        .breadcrumb span { color: #495057; }
        main { flex: 1; padding: 2rem 0; }
        article {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            margin-bottom: 2rem;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a2a3a;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 5px solid #00d4ff;
            padding-left: 1rem;
        }
        h2 {
            font-size: 2rem;
            color: #2c3e50;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eaeaea;
        }
        h3 {
            font-size: 1.6rem;
            color: #34495e;
            margin: 2rem 0 0.8rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #4a6572;
            margin: 1.5rem 0 0.6rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .highlight {
            background: #f0f8ff;
            border-left: 4px solid #2a7de1;
            padding: 1.2rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .article-img {
            width: 100%;
            max-width: 800px;
            margin: 2rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        .article-img img { width: 100%; transition: transform 0.5s; }
        .article-img:hover img { transform: scale(1.03); }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 0.5rem;
            background: #f9f9f9;
        }
        .module {
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            padding: 1.5rem;
            margin: 2rem 0;
        }
        .module h3 { margin-top: 0; }
        form { display: grid; gap: 1rem; }
        input, textarea, select {
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            width: 100%;
        }
        button, .btn {
            background: linear-gradient(45deg, #2a7de1, #1a5cb0);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            display: inline-block;
            text-align: center;
        }
        button:hover, .btn:hover {
            background: linear-gradient(45deg, #1a5cb0, #0d47a1);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        }
        .rating { display: flex; gap: 0.5rem; margin: 1rem 0; }
        .star { font-size: 1.8rem; color: #ddd; cursor: pointer; transition: color 0.2s; }
        .star:hover, .star.active { color: #ffc107; }
        .related-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1rem;
            margin: 2rem 0;
            padding: 1.5rem;
            background: #edf2f7;
            border-radius: 10px;
        }
        .related-links a {
            background: white;
            padding: 0.8rem;
            border-radius: 6px;
            text-align: center;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        .related-links a:hover {
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            text-decoration: none;
        }
        footer {
            background: #1a2a3a;
            color: #b0b7c3;
            padding: 3rem 0 1.5rem;
            margin-top: auto;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: #ecf0f1;
            margin-bottom: 1.2rem;
            font-size: 1.2rem;
        }
        friend-link {
            display: block;
            margin: 0.5rem 0;
            color: #00d4ff;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2c3e50;
            font-size: 0.9rem;
            color: #8a9bb2;
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .hamburger { display: block; }
            nav {
                width: 100%;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease;
            }
            nav.active { max-height: 300px; margin-top: 1rem; }
            nav ul {
                flex-direction: column;
                width: 100%;
            }
            nav ul li { margin: 0.5rem 0; margin-left: 0; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            article { padding: 1.5rem; }
            .related-links { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 480px) {
            .related-links { grid-template-columns: 1fr; }
            .footer-content { grid-template-columns: 1fr; }
        }