:root {
  color-scheme: dark;
  --bg: #0f1012;
  --surface: #16171a;
  --surface-2: #1b1d21;
  --hair: rgba(255,255,255,0.10);
  --ink: #ffffff;
  --ink-2: #c3c2b7;
  --muted: #898781;
  --s1: #3987e5;
  --s2: #d95926;
  --s3: #199e70;
  --good: #0ca30c;
  --warning: #fab219;
  --serious: #ec835a;
  --critical: #d03b3b;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 13px/1.45 var(--sans);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

h1, h2 { margin: 0; }

/* ---------- header ---------- */
.top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px 12px;
  border-bottom: 1px solid var(--hair);
  flex-wrap: wrap;
}
.brand h1 {
  font-size: 17px;
  letter-spacing: -0.01em;
  font-weight: 650;
}
.brand h1::before {
  content: "";
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 2px;
  background: var(--s2);
  margin-right: 8px;
  vertical-align: 1px;
}
.brand p { margin: 3px 0 0; color: var(--muted); font-size: 12px; max-width: 74ch; }
.transport { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* ---------- buttons ---------- */
.btn {
  background: var(--surface-2);
  color: var(--ink-2);
  border: 1px solid var(--hair);
  border-radius: 6px;
  padding: 6px 10px;
  font: 500 12px var(--sans);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.btn:hover { border-color: rgba(255,255,255,0.26); color: var(--ink); }
.btn.primary { background: #23262c; color: var(--ink); }
.btn.danger:hover { border-color: var(--critical); color: #ffbdbd; }
.btn kbd {
  font: 500 10px var(--mono);
  border: 1px solid var(--hair);
  border-radius: 3px;
  padding: 0 4px;
  color: var(--muted);
}
.seg { display: inline-flex; border: 1px solid var(--hair); border-radius: 6px; overflow: hidden; }
.seg.wide { display: flex; width: 100%; }
.seg button {
  background: transparent;
  border: 0;
  border-right: 1px solid var(--hair);
  color: var(--muted);
  font: 500 11px var(--sans);
  padding: 6px 9px;
  cursor: pointer;
  flex: 1;
}
.seg button:last-child { border-right: 0; }
.seg button.on { background: #262a31; color: var(--ink); }
.seg button:hover { color: var(--ink); }

/* ---------- layout ---------- */
.app {
  flex: 1;
  display: grid;
  grid-template-columns: 252px minmax(0, 1fr) 316px;
  gap: 12px;
  padding: 12px;
  min-height: 0;
}
.rail, .panel { display: flex; flex-direction: column; gap: 10px; overflow: auto; }
.card {
  background: var(--surface);
  border: 1px solid var(--hair);
  border-radius: 9px;
  padding: 11px 12px 12px;
}
.card h2 {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 9px;
}
.card h2.mt { margin-top: 14px; }

/* ---------- controls ---------- */
.scenarios { display: grid; grid-template-columns: 1fr 1fr; gap: 5px; }
.scenarios button {
  background: var(--surface-2);
  border: 1px solid var(--hair);
  border-radius: 6px;
  color: var(--ink-2);
  font: 500 11px var(--sans);
  padding: 7px 6px;
  cursor: pointer;
  text-align: left;
}
.scenarios button:hover { border-color: rgba(255,255,255,0.28); color: var(--ink); }
.scenarios button.on { background: #262a31; color: var(--ink); border-color: rgba(57,135,229,0.55); }
.blurb { color: var(--muted); font-size: 11.5px; margin: 9px 0 0; min-height: 30px; }

.ctl { display: block; margin-bottom: 10px; }
.ctl:last-child { margin-bottom: 2px; }
.ctl span { display: flex; justify-content: space-between; color: var(--muted); font-size: 11.5px; margin-bottom: 4px; }
.ctl b { color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }
input[type=range] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 3px; border-radius: 2px;
  background: #33363d; outline: none;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--ink); cursor: pointer; border: 0;
}
input[type=range]::-moz-range-thumb {
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--ink); cursor: pointer; border: 0;
}
input[type=range]:focus-visible { outline: 2px solid var(--s1); outline-offset: 3px; }
.chaos { display: flex; flex-direction: column; gap: 6px; }
.chaos .btn { justify-content: space-between; width: 100%; }

/* ---------- stage ---------- */
.stage { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.canvas-wrap {
  flex: 1;
  min-height: 420px;
  background: var(--surface);
  border: 1px solid var(--hair);
  border-radius: 9px;
  overflow: hidden;
}
#stage { display: block; width: 100%; height: 100%; }
.legend { display: flex; flex-wrap: wrap; gap: 14px; color: var(--muted); font-size: 11.5px; padding-left: 2px; }
.lg { display: inline-flex; align-items: center; gap: 5px; }

/* ---------- telemetry ---------- */
.tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.tile { display: flex; flex-direction: column; gap: 1px; }
.tile .lbl { color: var(--muted); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.07em; }
.tile b { font-size: 21px; font-weight: 600; line-height: 1.1; }
.tile .unit { color: var(--muted); font-size: 10.5px; }
.spark { display: block; width: 100%; height: 44px; }

.correct { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.correct li { display: flex; align-items: baseline; gap: 8px; font-size: 12px; color: var(--ink-2); }
.correct .n { font: 600 13px var(--sans); font-variant-numeric: tabular-nums; margin-left: auto; color: var(--ink); }
.correct .ic { font-size: 11px; width: 13px; text-align: center; }
.correct .zero { color: var(--muted); }
.correct .zero .n { color: var(--muted); }
.correct .good .ic { color: var(--good); }
.correct .warning .ic { color: var(--warning); }
.correct .serious .ic { color: var(--serious); }
.correct .critical .ic { color: var(--critical); }

.diag { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.diag li {
  font-size: 11.8px; line-height: 1.4; color: var(--ink-2);
  padding-left: 10px; border-left: 2px solid var(--muted);
}
.diag li.good { border-color: var(--good); }
.diag li.warning { border-color: var(--warning); }
.diag li.serious { border-color: var(--serious); }
.diag li.critical { border-color: var(--critical); }

.snaps { width: 100%; border-collapse: collapse; font: 400 11.5px var(--mono); }
.snaps td { padding: 3px 0; color: var(--ink-2); border-bottom: 1px solid rgba(255,255,255,0.05); }
.snaps td:last-child { text-align: right; color: var(--muted); }
.snaps .v { color: var(--ink); }
.snaps tr:first-child .v { color: var(--good); }

/* ---------- tape ---------- */
.tape {
  border-top: 1px solid var(--hair);
  background: var(--surface);
  height: 104px;
  overflow: auto;
  padding: 8px 14px;
}
.tape ul { list-style: none; margin: 0; padding: 0; }
.tape li { font: 400 11.5px/1.6 var(--mono); color: var(--ink-2); display: flex; gap: 10px; }
.tape .t { color: var(--muted); font-variant-numeric: tabular-nums; }
.tape .warn { color: var(--warning); }
.tape .bad { color: var(--critical); }
.tape .info { color: var(--s1); }
.tape .boot { color: var(--muted); }

@media (max-width: 1180px) {
  .app { grid-template-columns: 232px minmax(0, 1fr); }
  .rail, .panel { overflow: visible; }
  .panel { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); align-items: start; }
}
@media (max-width: 800px) {
  .app { grid-template-columns: minmax(0, 1fr); }
  .canvas-wrap { min-height: 340px; }
}