* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #09203f 0%, #537895 100%);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
        }

        h1 {
            text-align: center;
            color: white;
            margin-bottom: 10px;
            font-size: 2.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .subtitle {
            text-align: center;
            color: rgba(255,255,255,0.9);
            margin-bottom: 30px;
            font-size: 1.1rem;
        }

        .search-section {
            background: white;
            padding: 20px;
            border-radius: 50px;
            margin-bottom: 30px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        #search {
            flex: 1;
            padding: 15px 20px;
            border: 2px solid #e0e0e0;
            border-radius: 30px;
            font-size: 16px;
            transition: all 0.3s;
        }

        #search:focus {
            outline: none;
            border-color: #667eea;
        }

        button {
            padding: 15px 30px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            border-radius: 30px;
            cursor: pointer;
            font-size: 16px;
            font-weight: bold;
            transition: transform 0.2s;
        }

        button:hover {
            transform: translateY(-2px);
        }

        .category-buttons {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 30px;
        }

        .cat-btn {
            padding: 10px 20px;
            background: white;
            color: #667eea;
            border: 2px solid white;
            border-radius: 25px;
        }

        .cat-btn:hover {
            background: white;
            transform: translateY(-2px);
        }

        .books-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 25px;
            margin-top: 30px;
        }

        .book-card {
            background: white;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: transform 0.3s, box-shadow 0.3s;
            cursor: pointer;
        }

        .book-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }

        .book-cover {
            width: 100%;
            height: 300px;
            object-fit: cover;
            background: #f0f0f0;
        }

        .book-info {
            padding: 20px;
        }

        .book-title {
            font-size: 1.2rem;
            font-weight: bold;
            margin-bottom: 8px;
            color: #333;
        }

        .book-author {
            color: #667eea;
            font-size: 0.9rem;
            margin-bottom: 10px;
        }

        .book-description {
            color: #666;
            font-size: 0.85rem;
            line-height: 1.4;
            margin-bottom: 15px;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .book-rating {
            display: inline-block;
            background: #ffd700;
            padding: 4px 8px;
            border-radius: 5px;
            font-size: 0.8rem;
            font-weight: bold;
            margin-bottom: 10px;
        }

        .preview-link {
            display: inline-block;
            color: #667eea;
            text-decoration: none;
            font-weight: bold;
            font-size: 0.9rem;
        }

        .preview-link:hover {
            text-decoration: underline;
        }

        .loading {
            text-align: center;
            padding: 50px;
            color: white;
            font-size: 1.2rem;
        }

        .error {
            text-align: center;
            padding: 50px;
            color: #ff6b6b;
            font-size: 1.2rem;
        }

        .no-results {
            text-align: center;
            padding: 50px;
            color: white;
            font-size: 1.2rem;
        }

        @media (max-width: 768px) {
            h1 { font-size: 1.8rem; }
            .books-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
            .search-section { border-radius: 20px; }
        }
        h3 {
            color: white;
            font-size: 1.3rem;
        }