* { 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: #0056b3; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #003366; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(90deg, #0a2e5c 0%, #1a4b8c 100%);
            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;
            flex-wrap: wrap;
        }
        .logo a {
            font-size: 2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i { color: #FFD700; }
        nav.desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        nav.desktop-nav a {
            color: #e6f2ff;
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
        }
        nav.desktop-nav a:hover {
            border-bottom-color: #FFD700;
            color: #FFD700;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        nav.mobile-nav {
            display: none;
            width: 100%;
            background: #1a4b8c;
            padding: 1rem 0;
        }
        nav.mobile-nav.active { display: block; }
        nav.mobile-nav ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        nav.mobile-nav a {
            color: #e6f2ff;
            display: block;
            padding: 0.8rem 1rem;
            border-left: 4px solid transparent;
        }
        nav.mobile-nav a:hover {
            background: rgba(255,255,255,0.1);
            border-left-color: #FFD700;
        }
        .breadcrumb {
            padding: 1rem 0;
            background: #e9f1fa;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #555; }
        .breadcrumb a:hover { color: #0a2e5c; }
        .breadcrumb i { margin: 0 0.5rem; }
        .search-box {
            background: #fff;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            margin: 2rem 0;
            text-align: center;
        }
        .search-box h2 { margin-bottom: 1rem; color: #0a2e5c; }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-form input {
            flex: 1;
            padding: 1rem;
            border: 2px solid #ccc;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
        }
        .search-form button {
            background: #0a2e5c;
            color: white;
            border: none;
            padding: 1rem 1.5rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-weight: 600;
        }
        .search-form button:hover { background: #1a4b8c; }
        main { flex: 1; padding: 2rem 0; }
        article {
            background: white;
            border-radius: 16px;
            padding: 3rem;
            box-shadow: 0 8px 30px rgba(0,0,0,0.06);
            margin-bottom: 3rem;
        }
        h1 {
            font-size: 2.8rem;
            color: #0a2e5c;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            color: #1a4b8c;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #FFD700;
        }
        h3 {
            font-size: 1.5rem;
            color: #333;
            margin: 1.8rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight {
            background: #fff9e6;
            border-left: 5px solid #FFD700;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .related-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 3rem 0;
        }
        .link-card {
            background: #f8fbff;
            border: 1px solid #d1e3ff;
            border-radius: 10px;
            padding: 1.5rem;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .link-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .link-card a { font-weight: 600; }
        .feature-img {
            width: 100%;
            border-radius: 12px;
            margin: 2.5rem auto;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .user-interaction {
            background: #f0f8ff;
            padding: 2.5rem;
            border-radius: 12px;
            margin: 3rem 0;
            border: 1px dashed #1a4b8c;
        }
        .interaction-form {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
            max-width: 800px;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-group input, .form-group textarea, .form-group select {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #aaa;
            border-radius: 6px;
            font-family: inherit;
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #ccc;
            cursor: pointer;
        }
        .rating i:hover,
        .rating i.active { color: #FFD700; }
        .btn-submit {
            background: #0a2e5c;
            color: white;
            padding: 1rem 2rem;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            justify-self: start;
        }
        .btn-submit:hover { background: #1a4b8c; }
        footer {
            background: #0a2e5c;
            color: #e6f2ff;
            padding: 3rem 0 1.5rem;
            margin-top: auto;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: #FFD700;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #b3d9ff; }
        .footer-links a:hover { color: white; }
        friend-link {
            display: block;
            margin-top: 1rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #1a4b8c;
            font-size: 0.9rem;
            color: #99ccff;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            article { padding: 2rem; }
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            nav.desktop-nav { display: none; }
            .hamburger { display: block; }
            .search-form { flex-direction: column; }
            .search-form input { border-radius: 8px; margin-bottom: 0.5rem; }
            .search-form button { border-radius: 8px; }
            .related-links { grid-template-columns: 1fr; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            article { padding: 1.5rem; }
            .user-interaction { padding: 1.5rem; }
        }