body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;margin:0;padding:0;background:#f3f3f3;color:#333;display:flex;justify-content:center;align-items:center;height:100vh}.app-container{text-align:center;background:#c7e9f1;padding:2rem;border-radius:12px;box-shadow:0 8px 20px #0000001a;min-width:300px;max-width:500px}select{margin:1rem 0;padding:.5rem 1rem;border-radius:8px;border:1px solid #ccc;font-size:1rem;background-color:#cafbfd;color:#333}.crypto-card{margin-top:1rem;background:#c5ebf1;padding:1.5rem;border-radius:12px;box-shadow:0 4px 12px #00000014}.crypto-card h2{margin:0 0 1rem;color:#355c7d}.error{color:#f87171}