* { 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%);
            max-width: 1200px;
            margin: 0 auto;
            box-shadow: 0 0 30px rgba(0, 0, 0, 0.05);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #2c5282; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #1a365d; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { padding-left: 1.5em; margin-bottom: 1.5em; }
        .container { width: 100%; padding: 0 20px; }
        .visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); border: 0; }
        header { background: linear-gradient(90deg, #1e3c72, #2a5298); color: white; padding: 1.5rem 0; }
        .header-content { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
        .my-logo { font-family: 'Trebuchet MS', sans-serif; font-size: 2.2rem; font-weight: 800; letter-spacing: 1px; }
        .my-logo a { color: white; text-decoration: none; display: flex; align-items: center; gap: 10px; }
        .my-logo i { color: #ffcc00; }
        .breadcrumb { background: #edf2f7; padding: 0.8rem 20px; font-size: 0.9rem; margin-bottom: 1rem; }
        .breadcrumb a { color: #4a5568; }
        .breadcrumb a:hover { color: #2d3748; }
        .breadcrumb span { color: #718096; }
        nav { position: relative; }
        .nav-desktop { display: flex; gap: 2rem; }
        .nav-desktop a { color: white; font-weight: 500; padding: 0.5rem 0; position: relative; }
        .nav-desktop a:hover { text-decoration: none; color: #ffcc00; }
        .nav-desktop a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 3px; background: #ffcc00; transition: width 0.3s; }
        .nav-desktop a:hover::after { width: 100%; }
        .hamburger { display: none; background: none; border: none; color: white; font-size: 1.8rem; cursor: pointer; }
        #nav-toggle { display: none; }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-desktop { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; width: 100%; background: #2a5298; z-index: 1000; padding: 1rem; gap: 0; border-top: 2px solid #ffcc00; }
            .nav-desktop a { padding: 0.8rem; border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
            #nav-toggle:checked ~ .nav-desktop { display: flex; }
        }
        .search-bar { margin: 2rem 0; background: white; border-radius: 50px; padding: 0.5rem 1.5rem; display: flex; box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05); border: 2px solid #e2e8f0; }
        .search-bar input { flex-grow: 1; border: none; outline: none; font-size: 1rem; padding: 0.5rem; }
        .search-bar button { background: #2a5298; color: white; border: none; border-radius: 50px; padding: 0.7rem 1.5rem; cursor: pointer; font-weight: 600; transition: background 0.3s; }
        .search-bar button:hover { background: #1e3c72; }
        main { flex-grow: 1; padding: 2rem 0; }
        article { background: white; border-radius: 15px; padding: 2.5rem; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06); margin-bottom: 2rem; }
        h1 { font-size: 2.8rem; color: #1e3c72; margin-bottom: 1.5rem; line-height: 1.2; border-bottom: 3px solid #ffcc00; padding-bottom: 0.5rem; }
        h2 { font-size: 2rem; color: #2a5298; margin: 2.5rem 0 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid #e2e8f0; }
        h3 { font-size: 1.5rem; color: #2d3748; margin: 1.8rem 0 1rem; }
        h4 { font-size: 1.2rem; color: #4a5568; margin: 1.5rem 0 0.8rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead { font-size: 1.3rem; font-weight: 500; color: #2d3748; background: #f7fafc; padding: 1.5rem; border-left: 5px solid #2a5298; border-radius: 0 8px 8px 0; margin-bottom: 2rem; }
        .highlight { background: linear-gradient(120deg, #ffecb3 0%, #ffecb3 100%); padding: 0.2em 0.4em; border-radius: 3px; font-weight: 600; }
        .emoji { font-size: 1.2em; margin-right: 0.3em; }
        .stats-box { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; margin: 2rem 0; }
        .stat-card { background: #edf2f7; padding: 1.5rem; border-radius: 10px; text-align: center; border-top: 5px solid #2a5298; }
        .stat-card h3 { color: #2a5298; margin-top: 0; }
        .stat-number { font-size: 2.5rem; font-weight: 800; color: #1e3c72; }
        .feature-img { width: 100%; border-radius: 10px; margin: 2rem auto; box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1); border: 5px solid white; }
        .update-time { text-align: right; font-style: italic; color: #718096; font-size: 0.9rem; margin-top: 3rem; padding-top: 1rem; border-top: 1px dashed #cbd5e0; }
        .user-feedback { background: #f0f9ff; border: 2px dashed #90cdf4; border-radius: 15px; padding: 2rem; margin: 3rem 0; }
        .user-feedback h2 { color: #2c5282; border-bottom-color: #90cdf4; }
        .rating-form, .comment-form { margin-top: 1.5rem; }
        .star-rating { direction: rtl; display: inline-block; }
        .star-rating input { display: none; }
        .star-rating label { font-size: 2rem; color: #cbd5e0; cursor: pointer; padding: 0 5px; transition: color 0.3s; }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label { color: #ffcc00; }
        .form-group { margin-bottom: 1rem; }
        .form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #4a5568; }
        .form-group input, .form-group textarea, .form-group select { width: 100%; padding: 0.8rem; border: 2px solid #e2e8f0; border-radius: 8px; font-family: inherit; font-size: 1rem; transition: border 0.3s; }
        .form-group input:focus, .form-group textarea:focus { outline: none; border-color: #2a5298; }
        button[type="submit"] { background: linear-gradient(90deg, #2a5298, #1e3c72); color: white; border: none; padding: 1rem 2rem; border-radius: 8px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: transform 0.3s, box-shadow 0.3s; }
        button[type="submit"]:hover { transform: translateY(-3px); box-shadow: 0 7px 15px rgba(42, 82, 152, 0.3); }
        footer { background: #1a202c; color: #cbd5e0; 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: white; margin-bottom: 1rem; }
        .footer-section h3 { color: #ffcc00; margin-bottom: 1.5rem; font-size: 1.3rem; }
        .footer-links a { display: block; color: #cbd5e0; margin-bottom: 0.7rem; }
        .footer-links a:hover { color: #ffcc00; }
        friend-link { display: inline-block; background: rgba(255, 255, 255, 0.05); padding: 0.5rem 1rem; border-radius: 5px; margin: 0.3rem; color: #90cdf4; border: 1px solid #2d3748; }
        friend-link:hover { background: rgba(255, 255, 255, 0.1); color: #63b3ed; }
        .copyright { text-align: center; padding-top: 1.5rem; border-top: 1px solid #2d3748; font-size: 0.9rem; color: #a0aec0; }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            h3 { font-size: 1.3rem; }
            article { padding: 1.5rem; }
            .header-content { flex-direction: column; gap: 1rem; align-items: flex-start; }
            .search-bar { flex-direction: column; border-radius: 15px; padding: 1rem; }
            .search-bar input { margin-bottom: 1rem; }
            .stats-box { grid-template-columns: 1fr; }
        }