:root {
  --bg: #f4f6f8; --card: #fff; --text: #17202a; --muted: #5d6b78; --line: #dde3e9;
  --primary: #0f766e; --primary-ink: #fff; --ok: #15803d; --ok-bg: #dcfce7; --bad: #b91c1c; --bad-bg: #fee2e2;
  --warn: #a16207; --warn-bg: #fef3c7; --bar-off: #cfd6dd;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1418; --card: #182027; --text: #e6edf3; --muted: #93a1ad; --line: #2a343d;
    --primary: #14b8a6; --primary-ink: #04201d; --ok: #4ade80; --ok-bg: #12301f; --bad: #f87171; --bad-bg: #3a1616;
    --warn: #facc15; --warn-bg: #33290b; --bar-off: #34404a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.7 Vazirmatn, "Vazir", Tahoma, "Segoe UI", system-ui, sans-serif;
  padding-bottom: env(safe-area-inset-bottom);
}
[hidden] { display: none !important; }
.ltr { direction: ltr; unicode-bidi: isolate; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.center { text-align: center; }
h1 { font-size: 20px; margin: 0 0 6px; }
h2 { font-size: 17px; margin: 0; }

.top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: calc(10px + env(safe-area-inset-top)) 16px 10px; background: var(--card); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand { font-weight: 700; display: flex; align-items: center; gap: 8px; }
.logo { width: 22px; height: 22px; border-radius: 6px; background: var(--primary);
  box-shadow: inset 0 -6px 0 rgba(0,0,0,.18); }
.who { display: flex; align-items: center; gap: 10px; font-size: 14px; }

main { max-width: 960px; margin: 0 auto; padding: 18px 16px 40px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; margin-bottom: 14px; }
.narrow { max-width: 420px; margin: 8vh auto 0; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.between { justify-content: space-between; }
.head { margin-bottom: 12px; }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.grid .card { margin: 0; }

label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 4px; }
input {
  width: 100%; font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line);
  border-radius: 10px; padding: 10px 12px; outline: none;
}
input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 22%, transparent); }
input.big { font-size: 20px; letter-spacing: .5px; text-align: center; }
input.code { letter-spacing: 4px; font-family: ui-monospace, Consolas, monospace; }

.btn {
  font: inherit; border: 1px solid var(--line); background: var(--card); color: var(--text);
  border-radius: 10px; padding: 9px 16px; cursor: pointer; min-height: 42px;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); font-weight: 600; }
.btn.wide { width: 100%; margin-top: 16px; }
.btn:disabled { opacity: .55; cursor: default; }
form .row { margin-top: 16px; }
.link { font: inherit; background: none; border: 0; color: var(--primary); cursor: pointer; padding: 6px 0; }
.link:disabled { color: var(--muted); cursor: default; }
.err { color: var(--bad); min-height: 1.4em; margin: 10px 0 0; font-size: 14px; }

.pill { font-size: 13px; padding: 2px 10px; border-radius: 99px; white-space: nowrap; }
.pill.on { background: var(--ok-bg); color: var(--ok); }
.pill.off { background: var(--bad-bg); color: var(--bad); }
.pill.warn { background: var(--warn-bg); color: var(--warn); }

.gw .serial { font-size: 12px; }
.sig { display: flex; align-items: center; gap: 14px; margin: 16px 0 6px; }
.bars { display: flex; align-items: flex-end; gap: 3px; height: 26px; direction: ltr; }
.bars i { width: 6px; border-radius: 2px; background: var(--bar-off); }
.bars i:nth-child(1) { height: 20%; } .bars i:nth-child(2) { height: 40%; } .bars i:nth-child(3) { height: 60%; }
.bars i:nth-child(4) { height: 80%; } .bars i:nth-child(5) { height: 100%; }
.bars.l1 i:nth-child(-n+1), .bars.l2 i:nth-child(-n+2) { background: var(--warn); }
.bars.l3 i:nth-child(-n+3), .bars.l4 i:nth-child(-n+4), .bars.l5 i:nth-child(-n+5) { background: var(--ok); }
.bars.stale i { opacity: .45; }
.op { font-weight: 600; }
.facts { display: grid; grid-template-columns: auto 1fr; gap: 2px 14px; margin: 10px 0 0; font-size: 14px; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; }
.gwfoot { margin-top: 8px; border-top: 1px solid var(--line); padding-top: 4px; }
.empty p { margin: 4px 0; }