* { 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-color: #f9f9f9;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a { color: #E53935; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #B71C1C; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { color: #1a237e; margin-bottom: 1rem; font-weight: 700; line-height: 1.2; }
        h1 { font-size: 2.8rem; margin-top: 1.5rem; }
        h2 { font-size: 2.2rem; margin-top: 2.5rem; padding-bottom: 0.5rem; border-bottom: 3px solid #ff9800; }
        h3 { font-size: 1.8rem; margin-top: 2rem; color: #3949ab; }
        h4 { font-size: 1.4rem; margin-top: 1.5rem; color: #5c6bc0; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead { font-size: 1.3rem; font-weight: 300; color: #555; }
        .highlight { background-color: #fff9c4; padding: 0.2rem 0.5rem; border-radius: 3px; font-weight: 600; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        main { flex: 1; }
        header { background: linear-gradient(135deg, #1a237e 0%, #3949ab 100%); color: white; box-shadow: 0 4px 12px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 1000; }
        .header-top { display: flex; justify-content: space-between; align-items: center; padding: 1rem 0; }
        .logo a { font-size: 2.2rem; font-weight: 900; color: white; text-decoration: none; display: flex; align-items: center; }
        .logo a i { color: #ff9800; margin-right: 10px; }
        .logo a span { color: #ffeb3b; }
        .search-form { display: flex; flex-grow: 0.5; max-width: 400px; }
        .search-form input { flex-grow: 1; padding: 0.8rem 1rem; border: none; border-radius: 30px 0 0 30px; font-size: 1rem; }
        .search-form button { background: #ff9800; color: white; border: none; border-radius: 0 30px 30px 0; padding: 0.8rem 1.5rem; cursor: pointer; font-weight: bold; transition: background 0.3s; }
        .search-form button:hover { background: #f57c00; }
        .breadcrumb { background-color: #e8eaf6; padding: 0.8rem 0; font-size: 0.9rem; }
        .breadcrumb ol { display: flex; list-style: none; flex-wrap: wrap; }
        .breadcrumb li:not(:last-child)::after { content: '›'; margin: 0 10px; color: #777; }
        .breadcrumb a { color: #3949ab; }
        nav { background-color: #283593; }
        .nav-container { display: flex; justify-content: space-between; align-items: center; }
        .nav-links { display: flex; list-style: none; }
        .nav-links li { position: relative; }
        .nav-links a { color: white; padding: 1rem 1.5rem; display: block; font-weight: 500; text-decoration: none; transition: background 0.3s; }
        .nav-links a:hover { background-color: rgba(255, 255, 255, 0.1); }
        .hamburger { display: none; font-size: 1.8rem; color: white; background: none; border: none; cursor: pointer; padding: 0.5rem; }
        .hero { background: linear-gradient(rgba(25, 35, 110, 0.85), rgba(57, 73, 171, 0.9)), url('https://images.unsplash.com/photo-1593305841991-05c297ba4575?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80') center/cover no-repeat; color: white; padding: 4rem 2rem; text-align: center; border-radius: 10px; margin: 2rem 0; }
        .hero h1 { color: white; border: none; }
        .hero p { font-size: 1.2rem; max-width: 800px; margin: 0 auto 2rem; color: #eee; }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            .content-grid { grid-template-columns: 1fr; }
        }
        article { background: white; padding: 2.5rem; border-radius: 10px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); }
        .article-meta { color: #777; font-size: 0.9rem; margin-bottom: 2rem; display: flex; justify-content: space-between; flex-wrap: wrap; }
        .article-meta span { margin-right: 1.5rem; }
        .article-meta i { margin-right: 0.5rem; color: #ff9800; }
        aside .widget { background: white; padding: 1.5rem; margin-bottom: 2rem; border-radius: 10px; box-shadow: 0 3px 10px rgba(0,0,0,0.05); }
        .widget h3 { font-size: 1.4rem; margin-top: 0; border-bottom: 2px solid #ff9800; padding-bottom: 0.5rem; }
        .widget ul { list-style: none; }
        .widget li { padding: 0.8rem 0; border-bottom: 1px dashed #ddd; }
        .widget li:last-child { border-bottom: none; }
        .related-links a { color: #555; display: flex; align-items: center; }
        .related-links a:before { content: '▶'; color: #ff9800; margin-right: 10px; font-size: 0.8rem; }
        .interactive-section { background: #e3f2fd; padding: 2rem; border-radius: 10px; margin: 3rem 0; }
        .interactive-section h3 { color: #1565c0; border-bottom-color: #42a5f5; }
        .form-group { margin-bottom: 1.5rem; }
        label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #333; }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #bdbdbd;
            border-radius: 5px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus { outline: none; border-color: #3949ab; box-shadow: 0 0 0 2px rgba(57, 73, 171, 0.2); }
        .rating { display: flex; flex-direction: row-reverse; justify-content: flex-end; }
        .rating input { display: none; }
        .rating label { font-size: 2rem; color: #ccc; cursor: pointer; padding: 0 0.1rem; }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label { color: #ff9800; }
        .btn {
            display: inline-block;
            background: linear-gradient(to right, #E53935, #ff9800);
            color: white;
            padding: 0.9rem 2rem;
            border: none;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
            text-align: center;
        }
        .btn:hover { transform: translateY(-3px); box-shadow: 0 7px 14px rgba(0,0,0,0.1); text-decoration: none; }
        .article-img { margin: 2rem auto; border-radius: 8px; overflow: hidden; box-shadow: 0 8px 20px rgba(0,0,0,0.1); }
        .article-img figcaption { text-align: center; font-style: italic; color: #666; padding: 0.8rem; background: #f5f5f5; }
        footer { background: #1a237e; color: #e8eaf6; padding: 3rem 0 1.5rem; margin-top: 3rem; }
        .footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-bottom: 2rem; }
        .footer-logo { font-size: 1.8rem; font-weight: 700; color: #ffeb3b; margin-bottom: 1rem; }
        .footer-links h4 { color: #ff9800; border: none; font-size: 1.2rem; }
        .footer-links ul { list-style: none; }
        .footer-links li { margin-bottom: 0.7rem; }
        .footer-links a { color: #c5cae9; }
        friend-link { display: block; margin: 1rem 0; }
        friend-link a { color: #ffcc80; font-weight: bold; }
        .copyright { text-align: center; padding-top: 1.5rem; border-top: 1px solid #3949ab; font-size: 0.9rem; color: #9fa8da; }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .header-top { flex-direction: column; align-items: flex-start; }
            .search-form { max-width: 100%; width: 100%; margin-top: 1rem; }
            .hamburger { display: block; }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                position: absolute;
                top: 100%;
                left: 0;
                background-color: #283593;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
            }
            .nav-links.active { display: flex; }
            .nav-links li { width: 100%; }
            .nav-links a { padding: 1rem 2rem; border-bottom: 1px solid rgba(255,255,255,0.1); }
            .content-grid { gap: 2rem; }
            article { padding: 1.5rem; }
            .hero { padding: 3rem 1rem; }
        }
        .pulse { animation: pulse 2s infinite; }
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }
        .tooltip { position: relative; }
        .tooltip:hover:after {
            content: attr(data-tooltip);
            position: absolute;
            bottom: 100%;
            left: 50%;
            transform: translateX(-50%);
            background: #333;
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            font-size: 0.9rem;
            white-space: nowrap;
            z-index: 10;
        }