*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;background:#f5f5f7;color:#1a1a1a}.app{max-width:480px;margin:0 auto;padding:16px}h1{font-size:1.25rem;margin:0 0 16px}.card{background:#fff;border-radius:12px;padding:16px;margin-bottom:12px;box-shadow:0 1px 3px #00000014}button,.btn{display:block;width:100%;padding:12px;border:none;border-radius:10px;background:#007aff;color:#fff;font-size:1rem;cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}button.secondary{background:#e5e5ea;color:#1a1a1a;margin-top:8px}.slot{text-align:left;margin-bottom:8px}.error{color:#ff3b30;font-size:.9rem}input{width:100%;padding:10px;border:1px solid #ddd;border-radius:8px;margin-bottom:8px}