:root{--green:#25d366;--green-dark:#128c7e;--black:#0a0a0a;--white:#fafafa;--gray:#6b7280;--gray-light:#f3f4f6;--red:#ef4444;--radius:12px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,sans-serif;background:var(--gray-light);color:var(--black);line-height:1.6}.page{max-width:480px;margin:0 auto;padding:48px 24px;min-height:100vh;display:flex;flex-direction:column;justify-content:center}.card{background:var(--white);border-radius:16px;padding:28px 24px;box-shadow:0 10px 40px rgba(0,0,0,.08)}.card h1{font-size:22px;margin-bottom:6px}.card .lead{color:var(--gray);font-size:14px;margin-bottom:24px}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}.field label{font-size:13px;font-weight:600}.field input{padding:12px 14px;border:1px solid #e5e7eb;border-radius:var(--radius);font-size:15px;outline:none}.field input:focus{border-color:var(--green)}.field .error{color:var(--red);font-size:12px}.btn{width:100%;background:var(--green);color:var(--black);font-size:16px;font-weight:700;padding:15px 20px;border:none;border-radius:var(--radius);cursor:pointer;transition:transform .15s,opacity .15s}.btn:hover:not(:disabled){transform:translateY(-1px)}.btn:disabled{opacity:.6;cursor:not-allowed}.alert{background:#fef2f2;border:1px solid #fecaca;color:#991b1b;padding:12px 14px;border-radius:var(--radius);font-size:13px;margin-bottom:16px}.muted{color:var(--gray);font-size:12px;text-align:center;margin-top:16px}.copybox{display:flex;gap:8px;margin:12px 0}.copybox input{flex:1 1;padding:10px 12px;border:1px solid #e5e7eb;border-radius:var(--radius);font-size:12px;font-family:monospace;background:var(--gray-light)}.copybox button{background:var(--black);color:var(--white);border:none;padding:0 16px;font-size:13px;font-weight:600;cursor:pointer;white-space:nowrap}.copybox button,.qr{border-radius:var(--radius)}.qr{display:block;width:220px;height:220px;margin:16px auto}.status{font-size:14px;color:var(--gray);margin-top:8px}.center,.status{text-align:center}.link{color:var(--green-dark);font-weight:600;text-decoration:none}