* { 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: #f8f9fa;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }
        h1 { font-size: 2.8rem; margin: 1.5rem 0; color: #c62828; border-bottom: 3px solid #c62828; padding-bottom: 10px; }
        h2 { font-size: 2rem; margin: 1.8rem 0 1rem; color: #2c3e50; padding-left: 10px; border-left: 5px solid #3498db; }
        h3 { font-size: 1.6rem; margin: 1.5rem 0 0.8rem; color: #2980b9; }
        h4 { font-size: 1.3rem; margin: 1.2rem 0 0.6rem; color: #555; }
        p { margin-bottom: 1.2rem; text-align: justify; }
        a { color: #2980b9; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #c62828; }
        .emphasis { background: #fff3cd; padding: 15px; border-left: 4px solid #ffc107; margin: 1.5rem 0; border-radius: 0 5px 5px 0; }
        .note { background: #d4edda; padding: 12px; border-left: 4px solid #28a745; margin: 1.2rem 0; }
        .container { display: grid; grid-template-columns: 1fr 300px; gap: 30px; }
        main { grid-column: 1; }
        aside { grid-column: 2; }
        header { background: linear-gradient(135deg, #1a237e 0%, #283593 100%); color: white; padding: 1.5rem 0; margin-bottom: 2rem; border-radius: 0 0 15px 15px; box-shadow: 0 5px 20px rgba(0,0,0,0.1); }
        .header-content { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
        .logo { font-size: 2.2rem; font-weight: 800; letter-spacing: 1px; }
        .logo a { color: white; }
        .logo span { color: #ff5252; }
        nav ul { display: flex; list-style: none; flex-wrap: wrap; }
        nav li { margin-left: 1.8rem; }
        nav a { color: #e3f2fd; font-weight: 600; padding: 8px 12px; border-radius: 4px; }
        nav a:hover { background: rgba(255,255,255,0.15); }
        .hamburger { display: none; font-size: 1.8rem; cursor: pointer; }
        section { background: white; padding: 2rem; margin-bottom: 2rem; border-radius: 10px; box-shadow: 0 3px 15px rgba(0,0,0,0.05); }
        .section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; }
        .card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; margin: 1.5rem 0; }
        .card { border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden; transition: transform 0.3s, box-shadow 0.3s; }
        .card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
        .card img { width: 100%; height: 180px; object-fit: cover; display: block; }
        .card-content { padding: 1.2rem; }
        ul, ol { margin-left: 2rem; margin-bottom: 1.2rem; }
        li { margin-bottom: 0.5rem; }
        table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; }
        th, td { border: 1px solid #ddd; padding: 12px 15px; text-align: left; }
        th { background: #2c3e50; color: white; }
        tr:nth-child(even) { background: #f9f9f9; }
        .btn { display: inline-block; background: linear-gradient(to right, #c62828, #d32f2f); color: white; padding: 12px 25px; border-radius: 6px; font-weight: 600; border: none; cursor: pointer; transition: all 0.3s; text-align: center; min-height: 44px; min-width: 44px; }
        .btn:hover { background: linear-gradient(to right, #b71c1c, #c62828); transform: translateY(-2px); box-shadow: 0 5px 15px rgba(198,40,40,0.3); }
        .btn-secondary { background: linear-gradient(to right, #3498db, #2980b9); }
        .btn-secondary:hover { background: linear-gradient(to right, #2980b9, #1f618d); }
        form { background: #f8f9fa; padding: 1.5rem; border-radius: 8px; margin: 1.5rem 0; }
        .form-group { margin-bottom: 1.2rem; }
        label { display: block; margin-bottom: 0.5rem; font-weight: 600; }
        input, textarea, select { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 6px; font-family: inherit; font-size: 1rem; }
        textarea { min-height: 120px; resize: vertical; }
        .rating { display: flex; gap: 5px; margin: 10px 0; }
        .rating input { display: none; }
        .rating label { font-size: 1.8rem; color: #ddd; cursor: pointer; transition: color 0.2s; }
        .rating input:checked ~ label { color: #ffc107; }
        .rating label:hover, .rating label:hover ~ label { color: #ffc107; }
        .social-share { display: flex; gap: 15px; margin: 2rem 0; }
        .social-share a { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; background: #3b5998; color: white; border-radius: 50%; font-size: 1.3rem; transition: transform 0.3s; }
        .social-share a:hover { transform: scale(1.1); }
        .social-share .twitter { background: #1da1f2; }
        .social-share .linkedin { background: #0077b5; }
        .social-share .reddit { background: #ff4500; }
        .back-to-top { position: fixed; bottom: 30px; right: 30px; background: #2c3e50; color: white; width: 50px; height: 50px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; cursor: pointer; opacity: 0.8; transition: opacity 0.3s; z-index: 1000; }
        .back-to-top:hover { opacity: 1; }
        aside .widget { background: white; padding: 1.5rem; margin-bottom: 1.8rem; border-radius: 8px; box-shadow: 0 3px 10px rgba(0,0,0,0.05); }
        .widget h3 { font-size: 1.4rem; margin-top: 0; border-bottom: 2px solid #eee; padding-bottom: 0.5rem; }
        .quick-links ul { list-style: none; margin-left: 0; }
        .quick-links li { margin-bottom: 0.8rem; }
        .quick-links a { display: block; padding: 8px 12px; background: #f8f9fa; border-radius: 5px; }
        .quick-links a:hover { background: #e9ecef; }
        footer { background: #2c3e50; color: #ecf0f1; padding: 3rem 0 1.5rem; margin-top: 3rem; border-radius: 15px 15px 0 0; }
        .footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-bottom: 2rem; }
        .footer-section h4 { color: #fff; margin-bottom: 1.2rem; border-bottom: 2px solid #c62828; padding-bottom: 5px; display: inline-block; }
        friend-link { display: block; margin-bottom: 0.8rem; }
        friend-link a { color: #bdc3c7; }
        friend-link a:hover { color: #fff; }
        .copyright { text-align: center; padding-top: 1.5rem; border-top: 1px solid #4a6278; color: #95a5a6; font-size: 0.9rem; }
        @media (max-width: 1100px) {
            .container { grid-template-columns: 1fr; }
            aside { grid-column: 1; }
        }
        @media (max-width: 768px) {
            body { padding: 0 15px; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            .header-content { flex-direction: column; align-items: flex-start; }
            .logo { margin-bottom: 1rem; }
            nav ul { flex-direction: column; width: 100%; display: none; }
            nav ul.show { display: flex; }
            nav li { margin: 0; margin-bottom: 0.8rem; }
            .hamburger { display: block; align-self: flex-end; margin-top: -50px; }
            .card-grid { grid-template-columns: 1fr; }
            .social-share { justify-content: center; }
            .footer-content { grid-template-columns: 1fr; }
        }
        :focus { outline: 3px solid #3498db; outline-offset: 2px; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }