* { 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: 100vw;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { color: #2c3e50; font-weight: 700; margin-bottom: 1rem; }
        h1 { font-size: 2.8rem; line-height: 1.2; }
        h2 { font-size: 2.2rem; border-left: 5px solid #e74c3c; padding-left: 15px; margin-top: 2.5rem; }
        h3 { font-size: 1.8rem; color: #3498db; margin-top: 2rem; }
        p { margin-bottom: 1.5rem; font-size: 1.1rem; }
        a { color: #2980b9; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #e74c3c; }
        strong { color: #c0392b; font-weight: 700; }
        em { font-style: italic; color: #7f8c8d; }
        .highlight { background-color: #fffacd; padding: 2px 5px; border-radius: 3px; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin-top: 30px;
        }
        @media (max-width: 992px) {
            .main-grid { grid-template-columns: 1fr; }
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 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-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 900;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
        }
        .logo-icon { color: #ff9800; margin-right: 10px; }
        .main-nav ul {
            display: flex;
            list-style: none;
        }
        .main-nav li { margin-left: 30px; }
        .main-nav a {
            color: #ecf0f1;
            font-weight: 600;
            padding: 8px 5px;
            border-bottom: 2px solid transparent;
        }
        .main-nav a:hover, .main-nav a.active {
            color: #ff9800;
            border-bottom-color: #ff9800;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                background: #1a237e;
                flex-direction: column;
                padding: 20px;
                transition: left 0.4s ease;
                box-shadow: 0 5px 10px rgba(0,0,0,0.2);
            }
            .main-nav.active { left: 0; }
            .main-nav ul { flex-direction: column; }
            .main-nav li { margin: 15px 0; }
        }
        .breadcrumb {
            padding: 15px 0;
            background: #e3f2fd;
            font-size: 0.95rem;
        }
        .breadcrumb a { color: #555; }
        .breadcrumb span { color: #777; }
        .hero {
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1534423861386-85a16f5d13fd?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: 80px 20px;
            border-radius: 0 0 20px 20px;
            margin-bottom: 40px;
        }
        .hero h1 { color: white; font-size: 3.2rem; }
        .hero p { font-size: 1.3rem; max-width: 800px; margin: 0 auto 30px; color: #ddd; }
        .search-box {
            max-width: 600px;
            margin: 30px auto;
            background: white;
            padding: 25px;
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.08);
        }
        .search-box h3 { text-align: center; color: #2c3e50; }
        .search-form {
            display: flex;
            margin-top: 20px;
        }
        .search-input {
            flex: 1;
            padding: 15px 20px;
            border: 2px solid #3498db;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
            outline: none;
        }
        .search-btn {
            background: #3498db;
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-btn:hover { background: #2980b9; }
        .content-card {
            background: white;
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin-bottom: 30px;
        }
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
            margin: 30px 0;
        }
        .feature-item {
            background: #f1f8ff;
            padding: 25px;
            border-radius: 12px;
            border-left: 5px solid #3498db;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .feature-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(52, 152, 219, 0.15);
        }
        .feature-icon { font-size: 2.5rem; color: #3498db; margin-bottom: 15px; }
        .walkthrough-table {
            width: 100%;
            border-collapse: collapse;
            margin: 30px 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .walkthrough-table th, .walkthrough-table td {
            padding: 18px 15px;
            text-align: left;
            border-bottom: 1px solid #eee;
        }
        .walkthrough-table th {
            background: #2c3e50;
            color: white;
            font-weight: 600;
        }
        .walkthrough-table tr:nth-child(even) { background: #f9f9f9; }
        .walkthrough-table tr:hover { background: #e3f2fd; }
        .sidebar-widget {
            background: white;
            padding: 25px;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin-bottom: 30px;
        }
        .sidebar-widget h3 {
            font-size: 1.5rem;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #eee;
        }
        .quick-links li {
            list-style: none;
            margin-bottom: 12px;
            padding-left: 20px;
            position: relative;
        }
        .quick-links li:before {
            content: '▶';
            position: absolute;
            left: 0;
            color: #e74c3c;
            font-size: 0.8rem;
        }
        .rating-section, .comment-section {
            background: white;
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin: 40px 0;
        }
        .stars {
            display: flex;
            gap: 10px;
            margin: 20px 0;
        }
        .star {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star.active, .star:hover { color: #ff9800; }
        .rating-form, .comment-form {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 25px;
        }
        .form-input, .form-textarea {
            padding: 15px;
            border: 1px solid #ccc;
            border-radius: 8px;
            font-size: 1rem;
            font-family: inherit;
        }
        .form-textarea { min-height: 150px; resize: vertical; }
        .form-submit {
            background: #27ae60;
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.1rem;
            transition: background 0.3s;
            align-self: flex-start;
        }
        .form-submit:hover { background: #219653; }
        .article-img {
            margin: 30px auto;
            max-width: 900px;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 10px;
            background: #f9f9f9;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin: 50px 0 30px;
            padding: 30px;
            background: #e3f2fd;
            border-radius: 15px;
        }
        .web-link {
            background: white;
            padding: 20px;
            border-radius: 10px;
            text-align: center;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
            transition: transform 0.3s;
        }
        .web-link:hover { transform: translateY(-5px); }
        .web-link a { font-weight: 600; }
        .site-footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo { font-size: 2rem; font-weight: 900; color: #ff9800; }
        .footer-links h4 { color: #ff9800; margin-bottom: 20px; }
        .footer-links ul { list-style: none; }
        .footer-links li { margin-bottom: 12px; }
        .footer-links a { color: #bdc3c7; }
        .footer-links a:hover { color: #ff9800; }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #34495e;
            color: #95a5a6;
            font-size: 0.95rem;
        }
        .text-center { text-align: center; }
        .mb-20 { margin-bottom: 20px; }
        .mt-40 { margin-top: 40px; }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .hidden { display: none; }
        @media print {
            .site-header, .sidebar, .search-box, .rating-section, .comment-section, .site-footer { display: none; }
            .main-grid { grid-template-columns: 1fr; }
        }