:root{--bg:#f4f6f8;--card:#fff;--text:#1c2430;--muted:#5d6b7a;--border:#dde3ea;--brand:#0a7d4f;--brand-dark:#08643f;--danger:#b42318;--danger-bg:#fdecea;--ok-bg:#e7f6ee}@media (prefers-color-scheme:dark){:root{--bg:#11161c;--card:#1a2129;--text:#e8edf2;--muted:#9aa7b4;--border:#2c3640;--brand:#2fb67c;--brand-dark:#23a06b;--danger:#ff8a80;--danger-bg:#3a1f1d;--ok-bg:#173226}}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}.shell{max-width:480px;margin:0 auto;padding:48px 16px}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:24px}h1{margin:0 0 4px;font-size:1.35rem}.muted{color:var(--muted);margin:0 0 20px;font-size:.9rem}dl{grid-template-columns:auto 1fr;gap:8px 16px;margin:0 0 24px;display:grid}dt{color:var(--muted)}dd{text-align:right;margin:0;font-weight:500}.total{font-size:1.25rem;font-weight:700}button{color:#fff;background:var(--brand);cursor:pointer;border:0;border-radius:8px;width:100%;padding:14px;font-size:1rem;font-weight:600}button:hover:not(:disabled){background:var(--brand-dark)}button:disabled{opacity:.6;cursor:progress}.notice{border-radius:8px;margin-top:16px;padding:12px 14px}.notice.ok{background:var(--ok-bg)}.notice.error{background:var(--danger-bg);color:var(--danger)}.field{margin-bottom:14px;display:block}.field span{color:var(--muted);margin-bottom:6px;font-size:.9rem;display:block}.field input{width:100%;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:12px;font-size:1.05rem}.notice:not(.ok):not(.error){background:var(--bg);border:1px solid var(--border)}a{color:var(--brand)}.sim-tag{color:var(--muted);text-align:center;margin-top:10px;font-size:.75rem}