* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background: #f9f9f9;
            max-width: 100%;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 { color: #1a5276; margin-bottom: 1rem; line-height: 1.3; }
        h1 { font-size: 2.8rem; text-align: center; padding-top: 1rem; }
        h2 { font-size: 2.2rem; border-bottom: 3px solid #f1c40f; padding-bottom: 0.5rem; }
        h3 { font-size: 1.8rem; color: #2874a6; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        a { text-decoration: none; color: #1a5276; transition: color 0.3s; }
        a:hover { color: #f1c40f; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #1a5276, #2e86c1);
            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;
        }
        .logo {
            font-size: 2.2rem;
            font-weight: bold;
            color: #f1c40f;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .logo a { color: inherit; }
        nav ul {
            display: flex;
            list-style: none;
        }
        nav li { margin-left: 2rem; }
        nav a {
            color: white;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 0;
            position: relative;
        }
        nav a:hover { color: #f1c40f; }
        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: #f1c40f;
            transition: width 0.3s;
        }
        nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background: #e8f4fc;
            padding: 0.8rem 20px;
            font-size: 0.95rem;
            border-bottom: 1px solid #d1d8e0;
        }
        .breadcrumb a { color: #2e86c1; }
        .breadcrumb span { color: #7f8c8d; }
        main {
            background: white;
            padding: 2rem 0;
            box-shadow: 0 0 15px rgba(0,0,0,0.05);
            border-radius: 10px;
            margin: 2rem auto;
        }
        .article-content { padding: 0 2rem; }
        .user-interaction {
            background: #f1f8ff;
            padding: 2rem;
            border-radius: 10px;
            margin: 2rem 0;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        .interaction-box {
            background: white;
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
        }
        .interaction-box h3 { margin-top: 0; }
        form input, form textarea, form select {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 1rem;
        }
        form button {
            background: #1a5276;
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 5px;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.3s;
        }
        form button:hover { background: #f1c40f; color: #1a5276; }
        .featured-image {
            text-align: center;
            margin: 2rem 0;
        }
        .featured-image img {
            border-radius: 10px;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            max-height: 500px;
            object-fit: cover;
            width: 100%;
        }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .highlight {
            background: #fff9e6;
            padding: 0.2rem 0.5rem;
            border-left: 4px solid #f1c40f;
            font-weight: bold;
        }
        .quote {
            font-style: italic;
            border-left: 5px solid #1a5276;
            padding-left: 1.5rem;
            margin: 2rem 0;
            color: #555;
        }
        .web-links {
            background: #2c3e50;
            padding: 2rem;
            margin-top: 3rem;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1rem;
        }
        .web-link {
            background: #34495e;
            padding: 1rem;
            border-radius: 5px;
            text-align: center;
        }
        .web-link a {
            color: #f1c40f;
            font-weight: bold;
        }
        .web-link:hover { background: #3d566e; }
        footer {
            background: #1a252f;
            color: #ecf0f1;
            text-align: center;
            padding: 2rem 0;
        }
        .copyright {
            margin-top: 1rem;
            font-size: 0.9rem;
            color: #bdc3c7;
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #1a5276;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1rem;
                box-shadow: 0 4px 8px rgba(0,0,0,0.2);
            }
            nav ul.active { display: flex; }
            nav li { margin: 0.5rem 0; }
            .hamburger { display: block; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .user-interaction { grid-template-columns: 1fr; }
            .article-content { padding: 0 1rem; }
        }