*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f8f9fa;color:#333}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.container{max-width:1200px;margin:0 auto;padding:0 20px}.btn{padding:10px 20px;border:none;border-radius:6px;cursor:pointer;font-size:14px;font-weight:500;transition:all .2s ease;text-decoration:none;display:inline-block;text-align:center}.btn-primary{background-color:#007bff;color:#fff}.btn-primary:hover{background-color:#0056b3}.btn-secondary{background-color:#6c757d;color:#fff}.btn-secondary:hover{background-color:#545b62}.btn-outline{background-color:transparent;color:#007bff;border:1px solid #007bff}.btn-outline:hover{background-color:#007bff;color:#fff}.search-bar{width:100%;padding:12px 16px;border:2px solid #e9ecef;border-radius:8px;font-size:16px;transition:border-color .2s ease}.search-bar:focus{outline:none;border-color:#007bff}.filter-section{display:flex;gap:15px;margin-bottom:30px;flex-wrap:wrap;align-items:center}.filter-select{padding:10px 15px;border:2px solid #e9ecef;border-radius:6px;font-size:14px;background-color:#fff;cursor:pointer}.filter-select:focus{outline:none;border-color:#007bff}.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:25px;margin-top:30px}.book-card{background:#fff;border-radius:12px;box-shadow:0 4px 6px #0000001a;overflow:hidden;transition:transform .2s ease,box-shadow .2s ease;cursor:pointer}.book-card:hover{transform:translateY(-4px);box-shadow:0 8px 25px #00000026}.book-cover{width:100%;height:400px;object-fit:cover;background-color:#f8f9fa}.book-info{padding:20px}.book-title{font-size:18px;font-weight:600;margin-bottom:8px;color:#333;line-height:1.3}.book-genre{color:#666;font-size:14px;margin-bottom:5px}.book-date{color:#888;font-size:13px}.book-detail{max-width:800px;margin:0 auto;background:#fff;border-radius:12px;box-shadow:0 4px 6px #0000001a;overflow:hidden}.book-detail-header{display:flex;gap:30px;padding:30px}.book-detail-cover{width:300px;height:400px;object-fit:cover;border-radius:8px;box-shadow:0 4px 12px #00000026}.book-detail-info{flex:1;padding:20px 0}.book-detail-title{font-size:32px;font-weight:700;margin-bottom:15px;color:#333;line-height:1.2}.book-detail-author{font-size:20px;color:#666;margin-bottom:20px}.book-detail-meta{display:flex;flex-direction:column;gap:10px;margin-bottom:25px}.meta-item{display:flex;align-items:center;gap:10px;font-size:16px}.meta-label{font-weight:600;color:#555;min-width:120px}.book-description{font-size:16px;line-height:1.6;color:#444;margin-bottom:20px}.back-button{margin-bottom:30px}.header{background:#020024;background:linear-gradient(180deg,#020024,#090979 35%,#00d4ff);color:#fff;padding:70px 0;text-align:center;margin-bottom:40px}.header h1{font-size:48px;font-weight:700;margin-bottom:10px}.header p{font-size:18px;opacity:.9}.search-container{max-width:600px;margin:30px auto 0;position:relative}.search-icon{position:absolute;right:15px;top:50%;transform:translateY(-50%);color:#666;font-size:18px}.no-results{text-align:center;padding:60px 20px;color:#666}.no-results h3{font-size:24px;margin-bottom:10px;color:#333}.loading{text-align:center;padding:60px 20px;font-size:18px;color:#666}.loading h3{margin-bottom:10px;color:#333}.loading p{color:#666;margin-bottom:20px}.loading:before{content:"";display:inline-block;width:40px;height:40px;border:4px solid #f3f3f3;border-top:4px solid #007bff;border-radius:50%;animation:spin 1s linear infinite;margin-bottom:20px}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media (max-width: 768px){.book-detail-header{flex-direction:column;text-align:center}.book-detail-cover{width:250px;height:350px;margin:0 auto}.filter-section{flex-direction:column;align-items:stretch}.book-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}.header h1{font-size:36px}}