:root {
            --primary: #000000;
            --secondary: #121212;
            --accent: #FFD700;
            --text: #FFFFFF;
            --text-secondary: #CCCCCC;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: var(--primary);
            color: var(--text);
            margin: 0;
            padding: 0;
            min-height: 100vh;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        header {
            text-align: center;
            padding: 30px 0;
            border-bottom: 1px solid var(--accent);
            margin-bottom: 30px;
        }
        
        h1 {
            color: var(--accent);
            font-size: 2.5rem;
            margin: 0;
        }
        
        .filters {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-bottom: 30px;
            background-color: var(--secondary);
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
        }
        
        .search-box {
            flex: 1;
            min-width: 250px;
            position: relative;
        }
        
        .search-box input {
            width: 500px;
            padding: 12px 15px;
            border: 2px solid var(--accent);
            border-radius: 25px;
            background-color: var(--secondary);
            color: var(--text);
            font-size: 1rem;
        }
        
        .search-box input:focus {
            outline: none;
            box-shadow: 0 0 0 2px rgba(255, 215, 0, 0.3);
        }
        
        select {
            padding: 12px 15px;
            border: 2px solid var(--accent);
            border-radius: 25px;
            background-color: var(--secondary);
            color: var(--text);
            font-size: 1rem;
            cursor: pointer;
        }
        
        button {
            padding: 12px 25px;
            background-color: var(--accent);
            color: var(--primary);
            border: none;
            border-radius: 25px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 1rem;
        }
        
        button:hover {
            background-color: #FFC000;
            transform: translateY(-2px);
        }
        
        .collection-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 25px;
            margin-top: 30px;
        }
        
        .book-card {
            background-color: var(--secondary);
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        }
        
        .book-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(255, 215, 0, 0.2);
        }
        
        .book-cover {
            height: 300px;
            background-size: cover;
            background-position: center;
            position: relative;
        }
        
        .book-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
            padding: 20px;
            color: white;
        }
        
        .book-title {
            font-weight: bold;
            font-size: 1.2rem;
            margin-bottom: 5px;
            color: var(--accent);
        }
        
        .book-author {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        
        .book-meta {
            padding: 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .book-genre {
            background-color: rgba(255, 215, 0, 0.2);
            color: var(--accent);
            padding: 5px 10px;
            border-radius: 15px;
            font-size: 0.8rem;
        }
        
        .action-btn {
            padding: 8px 15px;
            background-color: var(--accent);
            color: var(--primary);
            border: none;
            border-radius: 15px;
            font-weight: bold;
            text-decoration: none;
            font-size: 0.9rem;
            transition: all 0.3s ease;
            display: inline-block;
        }
        
        .action-btn:hover {
            background-color: #FFC000;
            transform: translateY(-2px);
        }
        
        .action-btn:disabled {
            background-color: #555;
            color: #999;
            cursor: not-allowed;
        }
        
        @media (max-width: 768px) {
            .filters {
                flex-direction: column;
            }
            
            .collection-grid {
                grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            }
        }