body{font-family:system-ui,-apple-system,sans-serif;margin:0;padding:20px;background:#f5f5f5;color:#333}a{color:#06c;text-decoration:none}a:hover{text-decoration:underline}button{background:#06c;color:#fff;border:none;padding:10px 20px;border-radius:4px;cursor:pointer;font-size:16px}button:hover{background:#0052cc}button:disabled{background:#ccc;cursor:not-allowed}input{width:100%;padding:10px;margin:10px 0;border:1px solid #ddd;border-radius:4px;font-size:16px}.container{max-width:400px;margin:0 auto;background:#fff;padding:30px;border-radius:8px;box-shadow:0 2px 4px #0000001a}.error{color:#d32f2f;margin:10px 0;font-size:14px}