:root{--bg:#0f172a;--panel:#fff;--muted:#64748b;--border:#e2e8f0;--brand:#2563eb;--brand-dark:#1d4ed8;--danger:#dc2626;--ok:#16a34a}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:#f1f5f9;color:#0f172a}a{color:var(--brand);text-decoration:none}.site-header{background:var(--bg);color:#fff;padding:14px 24px;display:flex;align-items:center;justify-content:space-between}.site-header a{color:#cbd5e1;margin-left:18px}.brand{font-weight:700;color:#fff}.container{max-width:720px;margin:40px auto;padding:0 20px}.panel{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:28px;box-shadow:0 1px 2px rgba(15,23,42,.06)}h1{margin-top:0}label{display:block;font-size:13px;font-weight:600;margin:14px 0 6px}input,select{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:14px}button{margin-top:20px;background:var(--brand);color:#fff;border:0;border-radius:8px;padding:11px 18px;font-size:14px;font-weight:600;cursor:pointer}button:hover{background:var(--brand-dark)}button.secondary{background:transparent;color:var(--brand);border:1px solid var(--border)}.row{display:grid;grid-template-columns:1fr 1fr;grid-gap:14px;gap:14px}.notice{margin-top:16px;padding:12px 14px;border-radius:8px;font-size:14px}.notice.error{background:#fef2f2;color:var(--danger);border:1px solid #fecaca}.notice.ok{background:#f0fdf4;color:var(--ok);border:1px solid #bbf7d0}.muted{color:var(--muted);font-size:14px}.field-error{color:var(--danger);font-size:12px;margin-top:4px}