:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color:#213547;background-color:#f8fafc}*{margin:0;padding:0;box-sizing:border-box}body{min-height:100vh}#root{width:100%;min-height:100vh}.page-header{margin-bottom:2rem}.page-title{font-size:2rem;font-weight:700;color:#1e293b;margin-bottom:.5rem}.page-subtitle{font-size:1rem;color:#64748b}.card{background:#fff;border-radius:12px;padding:1.5rem;box-shadow:0 1px 3px #0000001a;transition:transform .2s,box-shadow .2s}.card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}.search-bar{display:flex;gap:.75rem;margin-bottom:2rem}.search-input{flex:1;padding:.75rem 1rem;border:1px solid #e2e8f0;border-radius:8px;font-size:1rem;transition:border-color .2s}.search-input:focus{outline:none;border-color:#3b82f6}.btn{padding:.75rem 1.5rem;border:none;border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;transition:background-color .2s,transform .1s}.btn:hover{transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background-color:#3b82f6;color:#fff}.btn-primary:hover:not(:disabled){background-color:#2563eb}.btn-secondary{background-color:#64748b;color:#fff}.btn-secondary:hover:not(:disabled){background-color:#475569}.loading{text-align:center;padding:3rem;color:#64748b;font-size:1.125rem}.empty-state{text-align:center;padding:3rem;color:#64748b}.empty-state-icon{font-size:4rem;margin-bottom:1rem}.empty-state p{margin-bottom:.5rem;font-size:1.125rem}@keyframes spin{0%{transform:translateY(-50%) rotate(0)}to{transform:translateY(-50%) rotate(360deg)}}