:root {
  color-scheme: dark;
  --black: #050505;
  --panel: #0d0f0d;
  --line: #293029;
  --text: #edf2ed;
  --muted: #8b978b;
  --green: #00e676;
  --amber: #ffb800;
  --red: #ff3b30;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--black); color: var(--text); font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace; }
body.alerting { animation: alarm-flash .7s steps(2, end) infinite; }
.shell { width: min(100% - 40px, 980px); margin: 0 auto; padding: 34px 0 50px; }
.topbar { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.eyebrow, .signal-label, .notes span { margin: 0; color: var(--muted); font-size: 12px; letter-spacing: .12em; }
h1 { margin: 10px 0 0; font-size: clamp(28px, 6vw, 56px); letter-spacing: -.06em; font-weight: 500; }
.connection { border: 1px solid var(--line); color: var(--amber); padding: 9px 11px; font-size: 12px; white-space: nowrap; }
.checkline { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; color: var(--green); font-size: 13px; letter-spacing: .02em; font-variant-numeric: tabular-nums; }
.checkline.warning { color: var(--red); }
.checkline.stale { color: var(--amber); }
.live-dot { width: 9px; height: 9px; flex: 0 0 auto; border-radius: 50%; background: currentColor; box-shadow: 0 0 0 0 currentColor; animation: live-pulse 1.2s ease-out infinite; }
.check-separator { color: var(--muted); }
.signal { display: grid; grid-template-columns: 22px 1fr; gap: 20px; min-height: 330px; align-items: center; border-bottom: 1px solid var(--line); }
.signal-mark { width: 22px; height: 150px; background: var(--amber); }
.signal.ready .signal-mark { background: var(--green); }
.signal.alert { background: var(--red); color: #050505; padding: 24px; margin-top: 22px; border: 0; }
.signal.alert .signal-mark { background: #050505; }
.signal-label { color: currentColor; opacity: .62; }
.signal-state { margin: 12px 0 10px; font-size: clamp(24px, 5vw, 52px); line-height: .98; letter-spacing: -.07em; max-width: 760px; }
.signal-detail { margin: 0; color: currentColor; opacity: .7; font-size: 14px; line-height: 1.5; max-width: 680px; }
.controls { display: flex; flex-wrap: wrap; gap: 12px; padding: 24px 0; border-bottom: 1px solid var(--line); }
button { border: 1px solid var(--green); background: var(--green); color: #051006; border-radius: 0; padding: 15px 18px; font: inherit; font-weight: 700; cursor: pointer; }
button:hover { background: #b8ffc9; }
button.secondary { border-color: var(--line); background: transparent; color: var(--text); }
button.acknowledge { border-color: var(--red); background: var(--red); color: #160000; min-width: 190px; }
button.acknowledge:hover { background: #ff8a84; }
.notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); margin-top: 24px; border: 1px solid var(--line); }
.notes div { background: var(--panel); padding: 15px; min-height: 84px; display: flex; flex-direction: column; justify-content: space-between; gap: 12px; }
.notes strong { font-size: 18px; font-weight: 500; }
@keyframes alarm-flash { 0%, 100% { background: var(--black); } 50% { background: #260604; } }
@keyframes live-pulse { 0% { box-shadow: 0 0 0 0 currentColor; opacity: 1; } 70% { box-shadow: 0 0 0 7px transparent; opacity: .65; } 100% { box-shadow: 0 0 0 0 transparent; opacity: 1; } }
@media (max-width: 640px) { .shell { width: min(100% - 24px, 980px); padding-top: 18px; } .topbar { display: block; } .connection { display: inline-block; margin-top: 18px; } .signal { min-height: 280px; } .notes { grid-template-columns: 1fr; } }