/* Base reset (the artifact host supplied this; GitHub Pages needs it inline) */
:root { padding-top: env(safe-area-inset-top, 0px); padding-bottom: env(safe-area-inset-bottom, 0px); }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; }
img { max-width: 100%; }
[hidden] { display: none !important; }

/* Layout: engineering-workbench. A drafting-paper ground, one large cutaway "bench" with a control rack beside it,
   an instrument row like a cockpit panel, then study cards (part notes, cycle, energy), then lab sheet + data. */
:root {
  --paper: #e8ebe6;
  --panel: #f5f6f2;
  --face: #fbfcfa;
  --ink: #17222c;
  --muted: #56646e;
  --line: #c3cac5;
  --accent: #2350b8;
  --accent-soft: rgba(35, 80, 184, .11);
  --metal: #c3c9c9;
  --metal2: #97a3aa;
  --rotor: #6a8299;
  --gas: #dfe6ea;
  --ok: #2b7a45;
  --caution: #b47400;
  --warn: #c0352b;
  --fuel: #d4700c;
  --font-display: "Barlow Condensed", "Arial Narrow", "Roboto Condensed", sans-serif;
  --font-body: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --radius: 6px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0e141a; --panel: #141c24; --face: #18222c; --ink: #dbe3e9; --muted: #8b9aa6; --line: #2a3743;
    --accent: #7ea4ff; --accent-soft: rgba(126, 164, 255, .14); --metal: #3a4650; --metal2: #55636e; --rotor: #7891ab;
    --gas: #1a2530; --ok: #4fb46c; --caution: #e3a43a; --warn: #f0604f; --fuel: #f08a2a; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0e141a; --panel: #141c24; --face: #18222c; --ink: #dbe3e9; --muted: #8b9aa6; --line: #2a3743;
  --accent: #7ea4ff; --accent-soft: rgba(126, 164, 255, .14); --metal: #3a4650; --metal2: #55636e; --rotor: #7891ab;
  --gas: #1a2530; --ok: #4fb46c; --caution: #e3a43a; --warn: #f0604f; --fuel: #f08a2a; color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  background: var(--paper); color: var(--ink); font-family: var(--font-body); font-size: 15px; line-height: 1.5;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 20px 40px;
}
.wrap { max-width: 1320px; margin: 0 auto; display: grid; gap: 18px; }
h1, h2, h3 { font-family: var(--font-display); text-wrap: balance; margin: 0; letter-spacing: .01em; }
h1 { font-size: clamp(34px, 5vw, 52px); font-weight: 700; line-height: 1; }
h2 { font-size: 24px; font-weight: 600; }
h3 { font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: .09em; color: var(--muted); }
p { margin: 0; }
a { color: var(--accent); }
.mono, output, .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
button, input { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

header.top { display: grid; gap: 10px; padding-top: 6px; }
.eyebrow { font-family: var(--font-mono); font-size: 12px; color: var(--muted); letter-spacing: .04em; }
.lede { max-width: 72ch; color: var(--muted); font-size: 16px; }

.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; min-width: 0; }

/* Bench */
.lab { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 18px; align-items: start; }
.stage { display: grid; gap: 10px; min-width: 0; }
.canvas-box { position: relative; background: var(--face); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
#engine { display: block; width: 100%; aspect-ratio: 1270 / 665; cursor: crosshair; touch-action: manipulation; }
.canvas-box .tag { position: absolute; left: 12px; top: 10px; font-family: var(--font-mono); font-size: 11px; color: var(--muted); pointer-events: none; }
.canvas-box .tag.r { left: auto; right: 12px; }
.canvas-scroll { overflow-x: auto; overscroll-behavior-x: contain; }
.cap { display: none; font-family: var(--font-mono); font-size: 11px; color: var(--muted); width: 100%; }
.status { display: flex; gap: 10px; align-items: baseline; padding: 10px 12px; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); min-height: 48px; }
.status .phase { font-family: var(--font-display); font-weight: 700; text-transform: uppercase; letter-spacing: .06em; font-size: 14px; color: var(--accent); white-space: nowrap; }
.status .msg { min-width: 0; }
.legend-row { display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; justify-content: space-between; }
.tscale { display: flex; align-items: center; gap: 8px; white-space: nowrap; min-width: 0; font-family: var(--font-mono); font-size: 11px; color: var(--muted); }
.tscale .bar { flex: 0 1 180px; min-width: 48px; width: 180px; height: 8px; border-radius: 4px; background: linear-gradient(90deg, rgb(64,110,214), rgb(46,160,170) 25%, rgb(214,170,52) 40%, rgb(236,118,40) 62%, rgb(218,58,40) 82%, rgb(176,24,96)); }
.toggles { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 13px; color: var(--muted); }
.toggles label { display: inline-flex; gap: 5px; align-items: center; cursor: pointer; }
.parts { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 4px 9px 4px 4px; border: 1px solid var(--line); border-radius: 999px; background: var(--face); cursor: pointer; font-size: 13px; }
.chip b { display: inline-grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; background: var(--ink); color: var(--face); font-family: var(--font-mono); font-size: 11px; }
.chip:hover { border-color: var(--accent); }
.chip[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }
.chip[aria-pressed="true"] b { background: var(--accent); }

/* Control rack */
.controls { display: grid; gap: 0; padding: 0; overflow: hidden; }
.ctl { padding: 14px 16px; border-bottom: 1px solid var(--line); display: grid; gap: 8px; }
.ctl:last-child { border-bottom: 0; }
.row { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 4px 8px; }
.row label, .row span { font-size: 14px; }
.sub { font-size: 12.5px; color: var(--muted); }
.btn { border: 1px solid var(--line); background: var(--face); border-radius: var(--radius); padding: 8px 12px; cursor: pointer; font-weight: 600; font-size: 14px; }
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--face); }
.btn.primary.on { background: var(--caution); border-color: var(--caution); }
.btn.danger { color: var(--warn); }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }
.seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--face); }
.seg button { border: 0; background: transparent; padding: 8px 4px; cursor: pointer; font-family: var(--font-display); font-weight: 600; letter-spacing: .06em; font-size: 15px; color: var(--muted); }
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-checked="true"] { background: var(--ink); color: var(--face); }
input[type="range"] { width: 100%; accent-color: var(--accent); }
.checks { display: grid; gap: 6px; font-size: 14px; }
.checks label { display: flex; gap: 8px; align-items: flex-start; cursor: pointer; }
.checks input { margin-top: 4px; accent-color: var(--accent); }
.checks small { display: block; color: var(--muted); font-size: 12.5px; line-height: 1.35; }

/* Instrument panel */
.panel { display: grid; gap: 14px; }
.gauges { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 10px; }
.gauge { display: grid; justify-items: center; gap: 2px; min-width: 0; }
.gauge canvas { width: 100%; max-width: 172px; aspect-ratio: 1; display: block; }
.readouts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px 16px; }
.ro { display: grid; gap: 0; padding: 6px 0; border-top: 1px solid var(--line); }
.ro span { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .07em; font-family: var(--font-display); font-weight: 600; }
.ro b { font-family: var(--font-mono); font-weight: 600; font-size: 17px; font-variant-numeric: tabular-nums; }
.ro b small { font-weight: 400; font-size: 12px; color: var(--muted); }
.annun { display: grid; grid-template-columns: repeat(auto-fit, minmax(104px, 1fr)); gap: 6px; }
.lamp { font-family: var(--font-display); font-weight: 700; letter-spacing: .07em; font-size: 13px; text-align: center; padding: 6px 4px; border-radius: 4px; border: 1px solid var(--line); color: var(--muted); background: var(--face); opacity: .55; }
.lamp.info { opacity: 1; color: var(--face); background: var(--accent); border-color: var(--accent); }
.lamp.caution { opacity: 1; color: #1b1300; background: var(--caution); border-color: var(--caution); }
.lamp.warn { opacity: 1; color: #fff; background: var(--warn); border-color: var(--warn); animation: blink 1s steps(2, start) infinite; }
@keyframes blink { to { filter: brightness(1.25); } }

/* Study cards */
.study { display: grid; grid-template-columns: 1.05fr 1.15fr 1fr; gap: 18px; align-items: start; }
.card h2 { margin-bottom: 4px; }
.card .kicker { font-family: var(--font-mono); font-size: 12px; color: var(--muted); }
.partbody { display: grid; gap: 10px; margin-top: 10px; max-width: 65ch; }
.facts { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.facts td { padding: 5px 0; border-top: 1px solid var(--line); vertical-align: top; }
.facts td:nth-child(2) { font-family: var(--font-mono); font-variant-numeric: tabular-nums; text-align: right; padding-left: 10px; }
.src { display: inline-block; font-family: var(--font-mono); font-size: 10px; padding: 0 5px; border-radius: 3px; margin-left: 6px; border: 1px solid var(--line); color: var(--muted); vertical-align: 1px; }
.src.tcds { border-color: var(--ok); color: var(--ok); }
.try { font-size: 14px; padding: 8px 10px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 4px 4px 0; }
.tournav { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; gap: 8px; }
#ts { width: 100%; aspect-ratio: 520 / 300; display: block; margin-top: 8px; }
.tbl-scroll { overflow-x: auto; }
table.st { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 8px; }
table.st th { text-align: left; font-family: var(--font-display); font-weight: 600; text-transform: uppercase; letter-spacing: .06em; font-size: 12px; color: var(--muted); padding: 4px 6px 4px 0; border-bottom: 1px solid var(--line); }
table.st td { padding: 4px 6px 4px 0; border-bottom: 1px solid var(--line); font-variant-numeric: tabular-nums; }
table.st td.n { font-family: var(--font-mono); text-align: right; }
table.st th.n { text-align: right; }
.ebar { display: flex; height: 26px; border-radius: 4px; overflow: hidden; border: 1px solid var(--line); margin: 6px 0 4px; background: var(--face); }
.ebar span { display: block; height: 100%; transition: width .3s; }
.ekey { display: grid; gap: 2px; font-size: 13px; }
.ekey div { display: flex; justify-content: space-between; gap: 8px; }
.sw { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; vertical-align: 0; }
.e-shaft { background: var(--accent); }
.e-loss { background: var(--fuel); opacity: .75; }
.e-comp { background: var(--metal2); }
#gears { width: 100%; aspect-ratio: 300 / 210; display: block; margin-top: 6px; }
.stack { display: grid; gap: 16px; }
.divider { border-top: 1px solid var(--line); padding-top: 14px; }

/* Lab sheet */
.two { display: grid; grid-template-columns: 1.3fr 1fr; gap: 18px; align-items: start; }
ol.exp { list-style: none; margin: 10px 0 0; padding: 0; display: grid; gap: 8px; counter-reset: e; }
ol.exp li { counter-increment: e; display: grid; grid-template-columns: 28px 1fr; gap: 10px; align-items: start; padding: 8px 0; border-top: 1px solid var(--line); font-size: 14.5px; }
ol.exp li::before { content: counter(e); display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; border: 1.5px solid var(--line); font-family: var(--font-mono); font-size: 12px; color: var(--muted); }
ol.exp li.done::before { content: "✓"; background: var(--ok); border-color: var(--ok); color: var(--face); font-weight: 700; }
ol.exp li.done { color: var(--muted); }
#log { list-style: none; margin: 10px 0 0; padding: 0; display: grid; gap: 0; font-size: 13.5px; }
#log li { display: grid; grid-template-columns: 52px 1fr; gap: 10px; padding: 6px 0; border-top: 1px solid var(--line); }
#log li time { font-family: var(--font-mono); color: var(--muted); }
#log li.warn b { color: var(--warn); }
#log li.caution b { color: var(--caution); }
#log .empty { display: block; color: var(--muted); }

/* Data */
table.spec { width: 100%; border-collapse: collapse; font-size: 14px; margin-top: 10px; }
table.spec th { text-align: left; font-weight: 600; padding: 6px 12px 6px 0; border-top: 1px solid var(--line); vertical-align: top; width: 42%; }
table.spec td { padding: 6px 0; border-top: 1px solid var(--line); font-family: var(--font-mono); font-size: 13px; font-variant-numeric: tabular-nums; }
ul.assume, ul.refs { margin: 10px 0 0; padding-left: 18px; display: grid; gap: 6px; font-size: 14px; }
ul.refs li span { color: var(--muted); }
footer { color: var(--muted); font-size: 13px; max-width: 80ch; }

@media (max-width: 1100px) {
  .study { grid-template-columns: 1fr 1fr; }
  .study > :last-child { grid-column: 1 / -1; }
}
@media (max-width: 920px) {
  .lab { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .stage { display: contents; }
  .canvas-box { order: 1; min-width: 0; }
  .status { order: 2; position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; box-shadow: 0 6px 14px -10px rgba(0, 0, 0, .45); }
  .controls { order: 3; }
  .legend-row { order: 4; }
  .parts { order: 5; }
  .controls { grid-template-columns: 1fr 1fr; }
  .ctl { border-right: 1px solid var(--line); }
  .gauges { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .two { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  #engine { min-width: 640px; }
  .canvas-box .tag:not(.r) { display: none; }
  .cap { display: block; }
  .controls { grid-template-columns: 1fr; }
  .ctl { border-right: 0; }
  .study { grid-template-columns: 1fr; }
  .gauges { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .readouts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .status { flex-direction: column; gap: 2px; }
}
@media (prefers-reduced-motion: reduce) {
  .lamp.warn { animation: none; }
  .ebar span { transition: none; }
}