:root{--bg: #f4f6fb;--card-bg: #ffffff;--text: #1f2937;--muted: #6b7280;--border: #d1d5db;--primary: #2563eb;--primary-hover: #1d4ed8;--success: #047857;--error: #b91c1c;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);display:flex;justify-content:center;align-items:flex-start;min-height:100vh;padding:2rem 1rem}.card{background:var(--card-bg);width:100%;max-width:420px;border-radius:16px;padding:2rem;box-shadow:0 10px 30px #00000014}.card__header h1{margin:0 0 .25rem;font-size:1.5rem}.card__subtitle{margin:0 0 1.5rem;color:var(--muted);font-size:.9rem}.field{display:block;margin-bottom:1.1rem}.field__label{display:block;font-size:.85rem;font-weight:600;margin-bottom:.4rem}.field input{width:100%;padding:.7rem .8rem;border:1px solid var(--border);border-radius:8px;font-size:1rem}.amount-input{position:relative}.amount-input__symbol{position:absolute;left:.8rem;top:50%;transform:translateY(-50%);color:var(--muted)}.amount-input input{padding-left:1.6rem}#card-container,.field>div{min-height:44px}button{width:100%;padding:.8rem;background:var(--primary);color:#fff;border:0;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;display:flex;justify-content:center;align-items:center;min-height:46px}button:hover:not(:disabled){background:var(--primary-hover)}button:disabled{opacity:.6;cursor:not-allowed}.spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.5);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.status{margin-top:1rem;font-size:.9rem}.status.success{color:var(--success)}.status.error{color:var(--error)}.card__footer{margin-top:1.5rem}.card__footer p{color:var(--muted);font-size:.78rem;text-align:center;margin:0}.link{display:inline-block;margin-top:1rem;color:var(--primary)}a{color:var(--primary)}