/* Turbofan Explorer — UI */
:root {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI Variable", "Segoe UI", system-ui, Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --r: 12px;
  --gut: 20px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}
:root, :root[data-theme="light"] {
  --bg: #eceef1;
  --panel: rgba(255, 255, 255, .74);
  --panel-solid: #ffffff;
  --panel-hi: rgba(255, 255, 255, .92);
  --border: rgba(16, 24, 40, .09);
  --border-hi: rgba(16, 24, 40, .16);
  --text: #12161c;
  --muted: #59626e;
  --faint: #8d95a0;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, .1);
  --hot: #e8590c;
  --track: rgba(16, 24, 40, .08);
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 8px 28px rgba(16, 24, 40, .08);
  --line: rgba(37, 99, 235, .72);
  --seg-on: #ffffff;
  --seg-on-text: #12161c;
  --btn-primary: #12161c;
  --btn-primary-text: #ffffff;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #06080c;
  --panel: rgba(15, 18, 25, .72);
  --panel-solid: #10141b;
  --panel-hi: rgba(22, 27, 36, .94);
  --border: rgba(255, 255, 255, .08);
  --border-hi: rgba(255, 255, 255, .16);
  --text: #e9ecf1;
  --muted: #9aa3af;
  --faint: #66707c;
  --accent: #5b9dff;
  --accent-soft: rgba(91, 157, 255, .14);
  --hot: #ff8a3d;
  --track: rgba(255, 255, 255, .09);
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 32px rgba(0, 0, 0, .35);
  --line: rgba(91, 157, 255, .75);
  --seg-on: rgba(255, 255, 255, .12);
  --seg-on-text: #ffffff;
  --btn-primary: #e9ecf1;
  --btn-primary-text: #0b0e13;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #06080c;
    --panel: rgba(15, 18, 25, .72);
    --panel-solid: #10141b;
    --panel-hi: rgba(22, 27, 36, .94);
    --border: rgba(255, 255, 255, .08);
    --border-hi: rgba(255, 255, 255, .16);
    --text: #e9ecf1;
    --muted: #9aa3af;
    --faint: #66707c;
    --accent: #5b9dff;
    --accent-soft: rgba(91, 157, 255, .14);
    --hot: #ff8a3d;
    --track: rgba(255, 255, 255, .09);
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 32px rgba(0, 0, 0, .35);
    --line: rgba(91, 157, 255, .75);
    --seg-on: rgba(255, 255, 255, .12);
    --seg-on-text: #ffffff;
    --btn-primary: #e9ecf1;
    --btn-primary-text: #0b0e13;
  }
}


* { box-sizing: border-box; }
html, body {
  margin: 0; height: 100%; overflow: hidden;
  background: var(--bg); color: var(--text);
  font-family: var(--font); font-size: 13px; line-height: 1.4;
  -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: transparent;
  transition: background-color .6s var(--ease);
}
.mono { font-family: var(--mono); font-feature-settings: "zero" 0; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; padding: 0; }
svg { stroke: currentColor; fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

#gl { position: fixed; inset: 0; width: 100%; height: 100%; display: block; outline: none; touch-action: none; }

/* ---------- loader ---------- */
#loader {
  position: fixed; inset: 0; z-index: 50; display: grid; place-content: center; justify-items: center; gap: 10px;
  background: var(--bg); transition: opacity .7s var(--ease), visibility .7s;
}
#loader.done { opacity: 0; visibility: hidden; }
.ld-ring { width: 54px; height: 54px; position: relative; margin-bottom: 8px; }
.ld-ring i { position: absolute; inset: 0; border-radius: 50%; border: 1.5px solid transparent; border-top-color: var(--text); animation: spin 1.1s linear infinite; }
.ld-ring i:nth-child(2) { inset: 8px; border-top-color: var(--accent); animation-duration: .8s; animation-direction: reverse; }
.ld-ring i:nth-child(3) { inset: 16px; border-top-color: var(--hot); animation-duration: .6s; }
@keyframes spin { to { transform: rotate(360deg); } }
.ld-title { font-weight: 600; font-size: 15px; letter-spacing: -.01em; }
.ld-sub { color: var(--muted); font-size: 11px; }

/* ---------- shared ---------- */
#ui { position: fixed; inset: 0; pointer-events: none; z-index: 10; }
#ui > * { pointer-events: auto; }
.kicker { font-size: 10.5px; letter-spacing: .12em; color: var(--accent); font-weight: 600; text-transform: uppercase; }
.panel {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--r);
  box-shadow: var(--shadow); backdrop-filter: blur(18px) saturate(1.4); -webkit-backdrop-filter: blur(18px) saturate(1.4);
  transition: background-color .6s var(--ease), border-color .6s var(--ease), transform .45s var(--ease), opacity .35s var(--ease);
}
.panel-head { display: flex; align-items: center; gap: 8px; padding: 10px 10px 8px 14px; }
.panel-head .kicker { margin-right: auto; }
.chip { font-size: 10.5px; padding: 2px 7px; border-radius: 999px; background: var(--track); color: var(--muted); white-space: nowrap; }
.chip.hot { background: color-mix(in srgb, var(--hot) 16%, transparent); color: var(--hot); }
.chip.acc { background: var(--accent-soft); color: var(--accent); }
.mini { width: 26px; height: 26px; display: grid; place-items: center; border-radius: 7px; color: var(--muted); transition: background .2s, color .2s; }
.mini svg { width: 15px; height: 15px; }
.mini:hover { background: var(--track); color: var(--text); }
.btn { height: 34px; padding: 0 14px; border-radius: 9px; display: inline-flex; align-items: center; gap: 7px; font-weight: 550; font-size: 12.5px;
  background: var(--panel); border: 1px solid var(--border); box-shadow: var(--shadow); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  transition: transform .15s, background .2s, color .2s, border-color .2s; }
.btn svg { width: 15px; height: 15px; }
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--btn-primary); color: var(--btn-primary-text); border-color: transparent; }
.btn.primary.on { background: var(--hot); color: #fff; }
.icon-btn { width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center; background: var(--panel); border: 1px solid var(--border);
  box-shadow: var(--shadow); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); color: var(--muted); transition: color .2s, background .2s; }
.icon-btn:hover { color: var(--text); }
.icon-btn svg { width: 17px; height: 17px; }
.icon-btn.on { color: var(--accent); }
:root[data-theme="light"] .i-moon, :root[data-theme="dark"] .i-sun { display: none; }
#btn-sound .i-snd-on { display: none; }
#btn-sound.on .i-snd-on { display: block; } #btn-sound.on .i-snd-off { display: none; }
#btn-spin .i-play { display: none; }
#btn-spin.paused .i-play { display: block; } #btn-spin.paused .i-pause { display: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- brand + top bar ---------- */
.brand { position: absolute; left: var(--gut); top: 18px; pointer-events: none; max-width: 46vw; }
.brand, .hud { text-shadow: 0 0 2px var(--bg), 0 1px 7px var(--bg); }
.brand h1 { margin: 3px 0 4px; font-size: 21px; font-weight: 650; letter-spacing: -.02em; }
.brand .stats { font-size: 11px; color: var(--muted); }
.brand .stats b { color: var(--text); font-weight: 600; }
.topbar { position: absolute; right: var(--gut); top: 18px; display: flex; gap: 8px; }

/* ---------- engine panel ---------- */
#engine { position: absolute; right: var(--gut); top: 66px; width: 278px; overflow: hidden; }
#engine.collapsed .eng-body { display: none; }
#engine.collapsed #btn-eng-collapse svg { transform: rotate(180deg); }
.eng-body { padding: 0 14px 12px; }
.eng-top { display: grid; grid-template-columns: 82px 1fr; gap: 8px; }
.lever-col { display: flex; flex-direction: column; align-items: center; gap: 10px; padding-top: 6px; }
.lever { position: relative; width: 82px; height: 170px; cursor: ns-resize; touch-action: none; outline: none; --pos: 0; }
.lv-track { position: absolute; left: 58px; top: 9px; bottom: 9px; width: 6px; margin-left: -3px; border-radius: 3px; background: var(--track); }
.lv-fill { position: absolute; left: 58px; bottom: 9px; width: 6px; margin-left: -3px; border-radius: 3px; height: calc((100% - 18px) * var(--pos));
  background: linear-gradient(to top, var(--accent), color-mix(in srgb, var(--accent) 40%, var(--hot))); }
.lever.rev .lv-fill { background: linear-gradient(to top, #c59310, var(--hot)); }
.lv-detent { position: absolute; left: 0; width: 70px; bottom: calc(9px + (100% - 18px) * var(--v)); height: 0; }
.lv-detent::after { content: ""; position: absolute; left: 44px; width: 26px; top: 0; border-top: 1px solid var(--border-hi); }
.lv-detent span { position: absolute; right: 32px; top: -7px; font: 600 9.5px/1 var(--mono); letter-spacing: .06em; color: var(--faint); }
.lever.rev .lv-detent span { opacity: .35; }
.lv-handle { position: absolute; left: 58px; bottom: calc(9px + (100% - 18px) * var(--pos)); width: 40px; height: 18px; margin: 0 0 -9px -20px;
  border-radius: 6px; background: var(--panel-solid); border: 1px solid var(--border-hi);
  box-shadow: 0 2px 6px rgba(0, 0, 0, .18); display: grid; place-items: center; transition: box-shadow .2s; }
.lv-handle i { width: 18px; height: 6px; border-top: 1px solid var(--faint); border-bottom: 1px solid var(--faint); }
.lever:focus-visible .lv-handle, .lever:active .lv-handle { box-shadow: 0 0 0 3px var(--accent-soft), 0 2px 6px rgba(0,0,0,.18); }
.btn.rev { height: 26px; padding: 0 12px; font-size: 11px; letter-spacing: .1em; box-shadow: none; }
.btn.rev.on { background: color-mix(in srgb, var(--hot) 18%, transparent); color: var(--hot); border-color: color-mix(in srgb, var(--hot) 50%, transparent); }
.btn.rev.on.ready { background: var(--hot); color: #fff; }
.gauge-col { display: flex; flex-direction: column; gap: 2px; }
.gauge { position: relative; height: 84px; }
.gauge svg { width: 100%; height: 76px; }
.g-track { stroke: var(--track); stroke-width: 6; }
.g-red { stroke: #e5484d; stroke-width: 6; stroke-dasharray: 4 100; stroke-dashoffset: -96; opacity: .8; }
.g-val { stroke: var(--accent); stroke-width: 6; stroke-dasharray: 0 100; transition: stroke .3s; }
#g-egt .g-val { stroke: var(--hot); }
.g-cmd { stroke: var(--text); stroke-width: 1.6; opacity: .6; }
.g-read { position: absolute; left: 0; right: 0; top: 34px; text-align: center; line-height: 1.05; }
.g-read b { display: block; font-size: 20px; font-weight: 600; letter-spacing: -.02em; }
.g-read span { font-size: 9.5px; color: var(--muted); letter-spacing: .06em; }
.readouts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin: 6px 0 10px; }
.readouts div { background: var(--track); border-radius: 8px; padding: 6px 8px; display: grid; grid-template-columns: auto auto; justify-content: start; column-gap: 3px; align-items: baseline; }
.readouts span { grid-column: 1 / -1; font-size: 9.5px; color: var(--muted); letter-spacing: .08em; }
.readouts b { font-size: 14px; font-weight: 600; }
.readouts i { font-style: normal; font-size: 10px; color: var(--muted); }
.stations { border-top: 1px solid var(--border); padding-top: 9px; }
.st-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.st-leg { font-size: 9.5px; color: var(--muted); display: flex; align-items: center; gap: 5px; }
.st-leg i { display: inline-block; width: 8px; height: 8px; border-radius: 2px; }
.sw-t { background: linear-gradient(90deg, var(--accent), var(--hot)); }
.sw-p { background: none; border: 1.5px solid var(--text); border-radius: 50% !important; width: 7px !important; height: 7px !important; opacity: .7; }
#st-svg { width: 100%; height: 92px; display: block; overflow: visible; }
#st-svg text { font-family: var(--mono); font-size: 8.5px; fill: var(--muted); stroke: none; }
#st-svg .v { fill: var(--text); font-size: 8.5px; font-weight: 600; }
#st-svg .pline { stroke: var(--text); stroke-width: 1.2; opacity: .55; }
#st-svg .pdot { fill: var(--panel-solid); stroke: var(--text); stroke-width: 1.2; }
#st-svg .base { stroke: var(--border-hi); stroke-width: 1; }

/* ---------- parts drawer ---------- */
#parts { position: absolute; left: var(--gut); top: 134px; bottom: 96px; width: 272px; display: flex; flex-direction: column; transform: translateX(calc(-100% - 40px)); opacity: 0; }
#parts.open { transform: none; opacity: 1; }
.parts-list { overflow-y: auto; padding: 0 8px 10px; scrollbar-width: thin; }
.pl-group { font: 600 9.5px/1 var(--mono); letter-spacing: .12em; color: var(--faint); padding: 12px 8px 6px; }
.pl-item { width: 100%; display: flex; align-items: center; gap: 9px; padding: 7px 8px; border-radius: 8px; text-align: left; transition: background .15s; }
.pl-item:hover, .pl-item.hover { background: var(--track); }
.pl-item.sel { background: var(--accent-soft); color: var(--accent); }
.pl-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); flex: none; }
.pl-name { flex: 1; font-size: 12.5px; }
.pl-meta { font: 10px var(--mono); color: var(--faint); }

/* ---------- inspect card ---------- */
#card { position: absolute; left: var(--gut); top: 134px; width: 300px; padding-bottom: 14px; transform: translateX(calc(-100% - 40px)); opacity: 0; }
#card.open { transform: none; opacity: 1; }
#card h2 { margin: 0 14px 6px; font-size: 18px; letter-spacing: -.015em; font-weight: 650; }
#card p { margin: 0 14px 12px; color: var(--muted); font-size: 12.5px; line-height: 1.5; }
#card dl { margin: 0 14px 12px; display: grid; grid-template-columns: auto 1fr; gap: 5px 12px; font-size: 11px; }
#card dt { color: var(--faint); }
#card dd { margin: 0; text-align: right; }
.c-nav { display: flex; gap: 2px; }
.switch { display: flex; align-items: center; gap: 8px; margin: 0 14px; font-size: 12px; color: var(--muted); cursor: pointer; user-select: none; }
.switch input { display: none; }
.switch .sw { width: 28px; height: 16px; border-radius: 9px; background: var(--track); position: relative; transition: background .2s; }
.switch .sw::after { content: ""; position: absolute; left: 2px; top: 2px; width: 12px; height: 12px; border-radius: 50%; background: var(--panel-solid); box-shadow: 0 1px 2px rgba(0,0,0,.25); transition: transform .2s var(--ease); }
.switch input:checked + .sw { background: var(--accent); }
.switch input:checked + .sw::after { transform: translateX(12px); }
.switch.tiny { margin: 0 2px; }
.switch.tiny input:checked + .sw { background: #22a06b; }

/* ---------- legend ---------- */
#legend { position: absolute; left: var(--gut); bottom: 96px; padding: 10px 12px; display: flex; flex-direction: column; gap: 2px; opacity: 0; transform: translateY(10px); pointer-events: none; }
#legend.open { opacity: 1; transform: none; pointer-events: auto; }
.lg-item { display: flex; align-items: center; gap: 8px; padding: 4px 6px; border-radius: 6px; font-size: 12px; text-align: left; }
.lg-item:hover { background: var(--track); }
.lg-item i { width: 10px; height: 10px; border-radius: 3px; }
.lg-item.off { opacity: .4; }
.lg-item.off i { background: transparent !important; outline: 1.5px solid var(--faint); outline-offset: -1.5px; }

/* ---------- heat-map legend ---------- */
.fl { position: absolute; left: var(--gut); bottom: 96px; width: 304px; padding: 10px 12px 10px; display: flex; flex-direction: column; gap: 7px;
  opacity: 0; transform: translateY(10px); pointer-events: none; }
.fl.open { opacity: 1; transform: none; pointer-events: auto; }
.seg.small { padding: 2px; }
.seg.small button { height: 24px; padding: 0 9px; font-size: 11.5px; flex: 1; }
.fl-bar { height: 10px; border-radius: 3px; box-shadow: inset 0 0 0 1px var(--border); }
.fl-ticks { position: relative; height: 12px; font-size: 10px; color: var(--muted); }
.fl-ticks span { position: absolute; top: 0; transform: translateX(-50%); white-space: nowrap; }
.fl-ticks span:first-child { transform: none; }
.fl-ticks span:last-child { transform: translateX(-100%); }
.fl-note { display: flex; justify-content: space-between; font-size: 11px; color: var(--faint); }
.fl-note .mono { color: var(--muted); }
.tooltip.probe { white-space: normal; max-width: 280px; line-height: 1.45; }
.tooltip.probe b { font-weight: 600; }
.tooltip.probe i { font-style: normal; opacity: .65; margin-left: 6px; }

/* ---------- dock ---------- */
.dock { position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%); max-width: calc(100vw - 2 * var(--gut)); }
.dock-inner { display: flex; align-items: center; gap: 6px; padding: 6px; border-radius: 14px; background: var(--panel); border: 1px solid var(--border);
  box-shadow: var(--shadow); backdrop-filter: blur(18px) saturate(1.4); -webkit-backdrop-filter: blur(18px) saturate(1.4); transition: background-color .6s var(--ease); }
.group { display: flex; align-items: center; gap: 4px; }
.sep { width: 1px; height: 22px; background: var(--border); margin: 0 2px; flex: none; }
.tool { height: 34px; padding: 0 11px; display: inline-flex; align-items: center; gap: 7px; border-radius: 9px; color: var(--muted); font-size: 12.5px; font-weight: 520; white-space: nowrap; transition: background .2s, color .2s; }
.tool svg { width: 17px; height: 17px; flex: none; }
.tool:hover { color: var(--text); background: var(--track); }
.tool.on { color: var(--accent); background: var(--accent-soft); }
.seg { display: flex; padding: 3px; border-radius: 10px; background: var(--track); gap: 2px; }
.seg button { height: 28px; padding: 0 11px; border-radius: 7px; font-size: 12px; color: var(--muted); font-weight: 520; white-space: nowrap; transition: background .2s, color .2s, box-shadow .2s; }
.seg button:hover { color: var(--text); }
.seg button.on { background: var(--seg-on); color: var(--seg-on-text); box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.cut-angle { display: none; align-items: center; gap: 4px; color: var(--muted); padding-left: 2px; }
.cut-angle.on { display: flex; }
.cut-angle svg { width: 15px; height: 15px; }
.slider { -webkit-appearance: none; appearance: none; width: 110px; height: 22px; background: none; margin: 0 6px 0 2px; cursor: pointer; --p: 0%; }
.slider.small { width: 76px; }
.slider::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: linear-gradient(90deg, var(--accent) var(--p), var(--track) var(--p)); }
.slider::-moz-range-track { height: 4px; border-radius: 2px; background: linear-gradient(90deg, var(--accent) var(--p), var(--track) var(--p)); }
.slider::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; margin-top: -6px; border-radius: 50%; background: var(--panel-solid); border: 1px solid var(--border-hi); box-shadow: 0 1px 4px rgba(0,0,0,.25); }
.slider::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: var(--panel-solid); border: 1px solid var(--border-hi); box-shadow: 0 1px 4px rgba(0,0,0,.25); }

/* ---------- HUD ---------- */
.hudbar { position: absolute; left: var(--gut); top: 100px; display: flex; align-items: center; gap: 12px; pointer-events: none; }
.hud { font-size: 11px; color: var(--muted); white-space: nowrap; }
.hud b { color: var(--text); font-weight: 600; }
.hud span { margin-right: 16px; }
.hud-chip { pointer-events: auto; font-size: 10.5px; color: var(--muted); padding: 3px 8px; border-radius: 7px; background: var(--track); border: 1px solid transparent; transition: color .2s, border-color .2s; }
.hud-chip:hover { color: var(--text); border-color: var(--border-hi); }
.hud-chip:hover { color: var(--text); }

/* ---------- callouts ---------- */
#labels { position: fixed; inset: 0; pointer-events: none; z-index: 5; }
.co-lines { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.co-lines path { stroke: var(--line); stroke-width: 1; fill: none; opacity: 0; transition: opacity .35s; }
.co-lines circle { fill: var(--accent); stroke: none; opacity: 0; transition: opacity .35s; }
.co-lines circle.halo { fill: none; stroke: var(--accent); stroke-width: 1; }
.co-lines .on { opacity: 1; }
.co-lines circle.halo.on { opacity: .35; }
.co-lines .hidden { opacity: 0 !important; }
.callout { position: absolute; left: 0; top: 0; max-width: 236px; padding: 6px 9px 7px; border-radius: 6px; background: var(--panel-hi); border: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0,0,0,.06); font-family: var(--mono); opacity: 0; transition: opacity .35s var(--ease); will-change: transform; }
.callout.on { opacity: 1; }
.callout.hidden { opacity: 0 !important; }
.co-title { font-size: 9.5px; font-weight: 700; letter-spacing: .08em; color: var(--accent); }
.co-text { font-size: 11.5px; color: var(--text); margin-top: 1px; }

/* ---------- tour caption ---------- */
.caption { position: absolute; left: 50%; bottom: 84px; width: min(560px, calc(100vw - 2 * var(--gut))); transform: translate(-50%, 16px); opacity: 0; pointer-events: none;
  padding: 12px 16px 14px; border-radius: 14px; background: var(--panel-hi); border: 1px solid var(--border); box-shadow: var(--shadow);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px); transition: opacity .4s var(--ease), transform .4s var(--ease); }
.caption.open { opacity: 1; transform: translate(-50%, 0); pointer-events: auto; }
.cap-top { display: flex; align-items: center; justify-content: space-between; }
.cap-btns { display: flex; gap: 2px; align-items: center; }
.mini.exit { width: auto; padding: 0 9px; font-size: 10.5px; letter-spacing: .06em; }
.caption h3 { margin: 4px 0 4px; font-size: 17px; letter-spacing: -.015em; font-weight: 650; }
.caption p { margin: 0 0 12px; color: var(--muted); font-size: 13px; line-height: 1.5; }
.cap-bar { display: flex; gap: 4px; }
.cap-bar i { flex: 1; height: 3px; border-radius: 2px; background: var(--track); overflow: hidden; position: relative; }
.cap-bar i b { position: absolute; inset: 0; background: var(--accent); transform-origin: left; transform: scaleX(0); }
.cap-bar i.done b { transform: scaleX(1); }

/* ---------- tooltip / toast / help ---------- */
.tooltip { position: fixed; left: 0; top: 0; padding: 4px 8px; border-radius: 6px; font-size: 11px; background: var(--btn-primary); color: var(--btn-primary-text);
  pointer-events: none !important; opacity: 0; transition: opacity .15s; white-space: nowrap; z-index: 20; }
.tooltip.on { opacity: 1; }
.tooltip span { opacity: .6; margin-left: 6px; }
.toast { position: absolute; left: 50%; top: 22px; transform: translate(-50%, -8px); padding: 7px 12px; border-radius: 8px; font-size: 11.5px;
  background: var(--btn-primary); color: var(--btn-primary-text); opacity: 0; pointer-events: none !important; transition: opacity .25s, transform .25s; }
.toast.on { opacity: 1; transform: translate(-50%, 0); }
.help { position: absolute; inset: 0; display: grid; place-items: center; background: rgba(0, 0, 0, .18); opacity: 0; pointer-events: none !important; transition: opacity .25s; }
.help.open { opacity: 1; pointer-events: auto !important; }
.help-card { width: min(540px, calc(100vw - 32px)); padding-bottom: 14px; background: var(--panel-hi); }
.keys { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 18px; padding: 4px 16px 12px; font-size: 11.5px; color: var(--muted); }
.keys div { display: flex; align-items: center; gap: 6px; }
kbd { font: 600 10.5px var(--mono); min-width: 22px; height: 20px; padding: 0 5px; display: inline-grid; place-items: center; border-radius: 5px;
  border: 1px solid var(--border-hi); background: var(--panel-solid); color: var(--text); box-shadow: 0 1px 0 var(--border-hi); }
.fine { margin: 0 16px; padding-top: 12px; border-top: 1px solid var(--border); font-size: 11.5px; color: var(--faint); line-height: 1.5; }

/* ---------- touring: quieter chrome ---------- */
body.touring #parts, body.touring #card { opacity: 0; pointer-events: none; }
body.touring .dock-inner { opacity: .55; }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .tool span { display: none; }
  .tool { padding: 0 9px; }
}
@media (max-width: 860px) {
  :root { --gut: 16px; }
  .brand .stats { display: none; }
  .brand h1 { font-size: 18px; }
  #labels { display: none; }
  #btn-tour span { display: none; }
  #btn-tour { width: 34px; padding: 0; justify-content: center; }
  #btn-full { display: none; }
  #engine { top: auto; bottom: 76px; right: var(--gut); width: 252px; }
  #engine .stations { display: none; }
  .hudbar { display: none; }
  .dock { left: var(--gut); right: var(--gut); transform: none; bottom: 14px; max-width: none; }
  .dock-inner { overflow-x: auto; scrollbar-width: none; }
  .dock-inner::-webkit-scrollbar { display: none; }
  .slider { width: 80px; }
  #explode, #t-labels { display: none; }
  .seg button { padding: 0 9px; }
  #card { left: var(--gut); right: var(--gut); width: auto; top: auto; bottom: 76px; max-height: 52vh; overflow: auto; transform: translateY(calc(100% + 100px)); }
  #card.open { transform: none; }
  #parts { left: var(--gut); right: var(--gut); width: auto; top: 76px; bottom: 76px; }
  #legend { bottom: 76px; }
  .fl { bottom: 76px; left: var(--gut); right: var(--gut); width: auto; }
  .caption { bottom: 76px; }
  body.card-open #engine, body.parts-open #engine, body.touring #engine { opacity: 0; pointer-events: none; }
  body.legend-open #engine { transform: translateY(-128px); }
  body.sys-open #engine { transform: translateY(-216px); }
  body.legend-open #engine:not(.collapsed), body.sys-open #engine:not(.collapsed) { opacity: 0; pointer-events: none; }
}
@media (max-width: 520px) {
  .brand .kicker { display: none; }
  .brand h1 { font-size: 16px; margin-top: 7px; }
  .icon-btn, .btn { height: 32px; }
  .icon-btn { width: 32px; }
  #engine { width: calc(100vw - 2 * var(--gut)); }
  .eng-top { grid-template-columns: 82px 1fr; }
  .caption h3 { font-size: 15px; }
  .caption p { font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}