.app{max-width:900px;margin:0 auto;padding:2rem;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,red,#0f0);min-height:100vh;color:#333}header{text-align:center;margin-bottom:3rem;padding:2rem;background:#fffc;border-radius:15px;box-shadow:0 4px 6px #0000001a}h1{color:#2c3e50;font-size:2.5rem;margin:0;text-shadow:1px 1px 2px rgba(0,0,0,.1)}nav{display:flex;justify-content:center;margin-bottom:2rem;gap:0;background:#ffffffe6;border-radius:25px;padding:.5rem;box-shadow:0 2px 4px #0000001a}nav button{padding:.75rem 1.5rem;border:none;background:transparent;color:#3498db;cursor:pointer;border-radius:20px;font-size:1rem;font-weight:600;transition:all .3s ease;flex:1}nav button:hover{background:#ecf0f1}nav button.active{background:#3498db;color:#fff;box-shadow:0 2px 4px #0003}.tab-content{padding:2rem;background:#ffffffe6;border-radius:15px;box-shadow:0 4px 6px #0000001a;min-height:400px}h2{color:#2c3e50;margin-bottom:1.5rem;font-size:1.8rem}textarea{width:100%;max-width:850px;padding:1rem;margin:0 auto 1.5rem;border:2px solid #bdc3c7;border-radius:10px;resize:vertical;font-family:inherit;font-size:1rem;transition:border-color .3s ease;box-sizing:border-box;display:block}textarea:focus{outline:none;border-color:#3498db;box-shadow:0 0 0 3px #3498db1a}button{padding:.75rem 1.5rem;background:#27ae60;color:#fff;border:none;border-radius:25px;cursor:pointer;font-size:1rem;font-weight:600;transition:all .3s ease;box-shadow:0 2px 4px #0000001a}button:hover{background:#2ecc71;transform:translateY(-2px);box-shadow:0 4px 8px #0003}button:disabled{background:#bdc3c7;cursor:not-allowed;transform:none;box-shadow:none}.book-list{list-style:none;padding:0}.book-item{padding:1.5rem;border:1px solid #ecf0f1;margin-bottom:1rem;border-radius:10px;background:#f8f9fa;transition:all .3s ease;display:flex;justify-content:space-between;align-items:center}.book-item:hover{background:#e9ecef;box-shadow:0 2px 4px #0000001a}.book-title{cursor:pointer;color:#3498db;font-weight:600;text-decoration:none;transition:color .3s ease}.book-title:hover{color:#2980b9;text-decoration:underline}.book-content{white-space:pre-wrap;text-align:left;line-height:1.6;font-size:1.1rem;color:#34495e}input{padding:.5rem;border:1px solid #bdc3c7;border-radius:5px;font-family:inherit;margin-right:.5rem}.generate-button{display:block}@media (max-width: 600px){.app{padding:1rem}header{padding:1rem}h1{font-size:2rem}nav{flex-direction:column;gap:.5rem}nav button{padding:.5rem 1rem}.tab-content{padding:1rem}.book-item{flex-direction:column;align-items:flex-start}button{margin-top:.5rem;width:100%}}#root{margin:0;padding:0;min-height:100vh}