:root{
  --bg:#f6f7fb; --card:#fff; --text:#0f172a; --muted:#64748b;
  --g:#16a34a; --b:#0ea5e9; --p:#6366f1; --r:#dc2626;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial}
.wrap{max-width:640px;margin:0 auto;padding:16px}
h1{font-size:20px;margin:0 0 12px}
.card{background:var(--card);border:1px solid #e5e7eb;border-radius:16px;padding:16px;box-shadow:0 1px 2px rgba(15,23,42,.06);margin-bottom:12px}
.row{display:flex;gap:12px;flex-wrap:wrap}
.field{flex:1;min-width:220px;display:flex;flex-direction:column;gap:6px}
.field input{padding:12px 14px;border:1px solid #e5e7eb;border-radius:12px;font-size:14px}
.grid{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:520px){.grid{grid-template-columns:1fr 1fr}}
.btn{width:100%;padding:18px 16px;border:0;border-radius:18px;color:#fff;font-weight:700;font-size:18px;box-shadow:0 4px 10px rgba(0,0,0,.08);cursor:pointer}
.btn:disabled{opacity:.5;cursor:not-allowed}
.b1{background:var(--g)} .b2{background:var(--b)} .b3{background:var(--p)} .b4{background:var(--r)}
.badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:700}
.badge.ok{background:#dcfce7;color:#166534} .badge.off{background:#fee2e2;color:#991b1b}
.muted{color:var(--muted);font-size:12px;margin-bottom:6px}
pre{background:#f1f5f9;border-radius:12px;padding:12px;overflow:auto;font-size:12px}
.state{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;color:var(--muted);font-size:13px}
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%);background:#111827;color:#fff;padding:12px 14px;border-radius:12px;font-size:14px;opacity:0;pointer-events:none;transition:opacity .25s;z-index:9999}
.toast.show{opacity:1}