/* Instrument-panel design language: the page is the faceplate of a small
   bench device. One molded chassis, engraved mono labels, segmented LED
   meters, a single physical power control. */
:root {
  --body: #d7d9d3;          /* molded chassis */
  --panel: #ecede8;         /* faceplate */
  --line: #c6c9c0;          /* hairline engraving */
  --line-strong: #9ba099;
  --fg: #1b1d1f;            /* ink */
  --muted: #70766f;
  --signal: #ff4f00;        /* the one loud color: power */
  --signal-ink: #1c0d04;
  --ok: #2e8b4f;
  --warn: #dd9a06;
  --danger: #cf3018;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Roboto Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --body: #101214;        /* black-edition chassis */
    --panel: #1a1d1f;
    --line: #2e3236;
    --line-strong: #4a5054;
    --fg: #e8eae6;
    --muted: #878e88;
    --signal: #ff5c1a;
    --ok: #3fa663;
    --warn: #e0a51f;
    --danger: #e05543;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
.defs { position: absolute; width: 0; height: 0; }
#offhatch line { stroke: var(--line-strong); stroke-width: 1.25; }

body {
  margin: 0; background: var(--body); color: var(--fg);
  font: 15px/1.5 var(--sans);
  padding: max(1.25rem, env(safe-area-inset-top)) 1rem
           max(1.5rem, env(safe-area-inset-bottom));
  -webkit-font-smoothing: antialiased;
}
main { max-width: 30rem; margin: 0 auto; }

.plate {
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  box-shadow: 0 1px 0 rgba(0,0,0,.12), 0 8px 24px -18px rgba(0,0,0,.4);
  overflow: hidden;
}

/* --- nameplate ----------------------------------------------------------- */
header {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 1rem; padding: 1.1rem 1.15rem .95rem;
}
h1 {
  margin: 0; font: 700 1rem var(--mono);
  text-transform: uppercase; letter-spacing: .18em;
}
h1::before {
  content: ""; display: inline-block; width: .55em; height: .55em;
  background: var(--signal); margin-right: .6em;
}
.tag {
  display: block; margin-top: .3rem;
  font: .625rem var(--mono); letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted);
}
#signout {
  background: none; border: 0; padding: 0; cursor: pointer;
  font: .6875rem var(--mono); letter-spacing: .06em;
  text-transform: uppercase; color: var(--muted);
  text-decoration: underline; text-underline-offset: 3px;
}

/* --- zones --------------------------------------------------------------- */
section { border-top: 1px solid var(--line); }
.zone { padding: 1.05rem 1.15rem; }
#panel .zone + .zone { border-top: 1px solid var(--line); }
h2 {
  margin: 0 0 .8rem; font: 600 .625rem var(--mono);
  text-transform: uppercase; letter-spacing: .22em; color: var(--muted);
}

dl {
  display: grid; grid-template-columns: auto 1fr; gap: .45rem 1rem;
  margin: 0; font-size: .8125rem;
}
dt { color: var(--muted); font-family: var(--mono); }
dd { margin: 0; text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.zone .meters + dl, .zone .power-row + dl { margin-top: .9rem; padding-top: .9rem; border-top: 1px dashed var(--line); }

/* --- power --------------------------------------------------------------- */
.power-row { display: flex; align-items: center; gap: 1.1rem; }
.power {
  width: 4.75rem; height: 4.75rem; flex: none; padding: 0;
  border-radius: 50%; border: 1px solid var(--line-strong);
  background: var(--panel); color: var(--fg); cursor: pointer;
  box-shadow: 0 2px 0 rgba(0,0,0,.18);
  touch-action: manipulation; -webkit-user-select: none; user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.power:active:not(:disabled) { transform: translateY(1px); box-shadow: 0 1px 0 rgba(0,0,0,.18); }
.power:disabled { cursor: default; color: var(--muted); }
.power:not(.on):not(:disabled) {
  background: var(--signal); border-color: var(--signal); color: var(--signal-ink);
}
.power svg { width: 100%; height: 100%; display: block; }
.glyph { fill: none; stroke: currentColor; stroke-width: 3.5; stroke-linecap: round; }
.ring-track { fill: none; stroke: var(--line); stroke-width: 1.5; }
.power:not(.on):not(:disabled) .ring-track { stroke: color-mix(in srgb, var(--signal-ink) 25%, transparent); }
.ring-fill {
  fill: none; stroke: var(--danger); stroke-width: 3; stroke-linecap: round;
  stroke-dasharray: 220; stroke-dashoffset: 220;
  transform: rotate(-90deg); transform-origin: center;
  transition: stroke-dashoffset .2s ease;
}
.power.arming .ring-fill { stroke-dashoffset: 0; transition: stroke-dashoffset 1.1s linear; }

.statebox { min-width: 0; }
.staterow { display: flex; align-items: center; gap: .55rem; }
strong#state {
  font: 700 1.05rem var(--mono); text-transform: uppercase; letter-spacing: .1em;
}
.powerlabel { display: block; margin-top: .2rem; font-size: .8125rem; color: var(--muted); }

.led { width: .55rem; height: .55rem; border-radius: 50%; background: var(--line-strong); flex: none; }
.led[data-on="running"] { background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 22%, transparent); }
.led[data-on="pending"], .led[data-on="stopping"] { background: var(--warn); animation: blink 1s steps(2, jump-none) infinite; }
@keyframes blink { 50% { opacity: .25; } }

.hint, .err { color: var(--muted); font-size: .8125rem; margin: .8rem 0 0; min-height: 1.2em; }
#hint:empty { display: none; }
.err { color: var(--danger); font-family: var(--mono); margin: 0; }

/* --- segmented LED meters ------------------------------------------------ */
.meters { display: grid; gap: .7rem; }
.meter { display: grid; grid-template-columns: 4.25rem 1fr 2.9rem; align-items: center; gap: .7rem; }
.meter.wide { grid-template-columns: 1fr auto; margin-top: .9rem; }
.lbl { color: var(--muted); font: .6875rem var(--mono); text-transform: uppercase; letter-spacing: .1em; }
.bar {
  height: .625rem; position: relative;
  background: repeating-linear-gradient(90deg, var(--line) 0 5px, transparent 5px 8px);
}
.bar > i {
  display: block; height: 100%; width: 0;
  background: repeating-linear-gradient(90deg, var(--ok) 0 5px, transparent 5px 8px);
  transition: width .4s ease;
}
.meter[data-level="warn"] .bar > i {
  background: repeating-linear-gradient(90deg, var(--warn) 0 5px, transparent 5px 8px);
}
.meter[data-level="crit"] .bar > i {
  background: repeating-linear-gradient(90deg, var(--danger) 0 5px, transparent 5px 8px);
}
.val { font: .75rem var(--mono); text-align: right; font-variant-numeric: tabular-nums; }

/* --- history charts ------------------------------------------------------ */
.chart { margin: 0 0 .9rem; }
.chart:last-of-type { margin-bottom: .35rem; }
.chart figcaption {
  font: .6875rem var(--mono); text-transform: uppercase; letter-spacing: .1em;
  color: var(--muted); margin-bottom: .35rem;
}
.chart svg {
  display: block; width: 100%; height: 60px;
  border: 1px solid var(--line); background: var(--panel);
}
.chart .grid  { stroke: var(--line); vector-effect: non-scaling-stroke; }
.chart .trace { fill: none; stroke: var(--fg); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.chart .fill  { fill: var(--fg); opacity: .09; stroke: none; }
.chart .off   { fill: url(#offhatch); }
.chart .now   { fill: var(--signal); }
.ticks {
  display: flex; justify-content: space-between; margin-top: .35rem;
  font: .625rem var(--mono); color: var(--muted); letter-spacing: .05em;
}

.foot { color: var(--muted); font-size: .6875rem; margin: .75rem 0 0; }
#history .foot { margin-top: .5rem; }

/* --- sign-in / spec plate ------------------------------------------------ */
.lede { margin: 0 0 1.1rem; color: var(--muted); }
.btn {
  display: block; text-align: center; text-decoration: none; cursor: pointer;
  padding: .9rem 1rem; border: 1px solid var(--line-strong);
  background: var(--panel); color: var(--fg);
  font: 600 .8125rem var(--mono); text-transform: uppercase; letter-spacing: .12em;
  box-shadow: 0 2px 0 rgba(0,0,0,.18);
}
.btn:active { transform: translateY(1px); box-shadow: 0 1px 0 rgba(0,0,0,.18); }
.btn.primary { background: var(--signal); border-color: var(--signal); color: var(--signal-ink); }

footer.zone { padding-top: .8rem; padding-bottom: .8rem; }
#spec {
  font: .625rem var(--mono); color: var(--muted);
  text-transform: uppercase; letter-spacing: .12em;
}

:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  .led[data-on] { animation: none; }
  .bar > i, .ring-fill, .power.arming .ring-fill { transition: none; }
}