*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,sans-serif;color:#1a1a1a;background:#fafafa;overflow-y:scroll}.app{max-width:1200px;margin:0 auto;padding:1.5rem}header{display:flex;align-items:center;gap:.75rem;margin-bottom:1.5rem}.header-logo{height:3.5rem;width:auto}header h1{font-size:1.5rem;font-weight:700}.search-bar{width:100%;padding:.6rem 1rem;font-size:1rem;border:1px solid #ddd;border-radius:6px;margin-bottom:1rem;background:#fff}.search-bar:focus{outline:none;border-color:#4a90d9;box-shadow:0 0 0 2px #4a90d926}.filters{display:flex;gap:.5rem;margin-bottom:1.5rem;flex-wrap:wrap}.filters select{padding:.4rem .75rem;border:1px solid #ddd;border-radius:4px;font-size:.9rem;background:#fff}.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:1rem}.book-card{display:flex;flex-direction:column;border:none;background:#fff;border-radius:8px;overflow:hidden;cursor:pointer;box-shadow:0 1px 3px #00000014;transition:box-shadow .2s,transform .2s;padding:0;text-align:left;font:inherit}.book-card:hover{box-shadow:0 4px 12px #0000001f;transform:translateY(-2px)}.book-cover{width:100%;aspect-ratio:2 / 3;object-fit:cover;background:#f0f0f0}.book-cover-placeholder{display:flex;align-items:center;justify-content:center;background:#e8e8e8;color:#999;font-size:2rem;font-weight:700;aspect-ratio:2 / 3}.book-info{padding:.6rem;display:flex;flex-direction:column;gap:.2rem}.book-title{font-weight:600;font-size:.85rem;line-height:1.2;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.book-author{font-size:.75rem;color:#666}.book-detail-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;padding:1rem;z-index:100}.book-detail{background:#fff;border-radius:12px;max-width:600px;width:100%;max-height:90vh;overflow-y:auto;padding:2rem;position:relative}.close-btn{position:absolute;top:1rem;right:1rem;background:none;border:none;font-size:1.5rem;cursor:pointer;color:#666;line-height:1}.book-detail-content{display:flex;gap:1.5rem}.detail-cover{width:120px;height:180px;object-fit:cover;border-radius:4px;flex-shrink:0}.detail-info h2{font-size:1.3rem;margin-bottom:.5rem}.detail-author{font-size:1rem;color:#555;margin-bottom:.5rem}.detail-meta{font-size:.85rem;color:#777;margin-bottom:.5rem}.detail-desc{font-size:.9rem;line-height:1.5;margin-bottom:.75rem}.detail-tags{display:flex;flex-wrap:wrap;gap:.3rem;margin-bottom:.75rem}.tag{font-size:.75rem;padding:.2rem .6rem;background:#e8f4fd;color:#1a6fb5;border-radius:12px}.loading,.error,.empty-state{text-align:center;padding:3rem;color:#666}.error{color:#dc3545}@media(max-width:600px){.book-grid{grid-template-columns:repeat(auto-fill,minmax(120px,1fr))}.book-detail-content{flex-direction:column;align-items:center}.filters{flex-direction:column}.filters select{width:100%}}