@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&display=swap');
/* Methalox Plume theme: cryogenic navy, plume blue, ignition orange. Chart colours are the validated
   dataviz reference palette (blue, orange, aqua, ...) checked against these page surfaces. */
:root { --heading-font: 'Space Grotesk', 'Inter', sans-serif; --viz-font: 'Inter', sans-serif; }
body[data-md-color-scheme="default"] {
  --md-default-bg-color: #fbfbfd;
  --md-default-bg-color--light: #fbfbfd;
  --md-default-fg-color: rgba(16, 22, 44, 0.92);
  --md-default-fg-color--light: rgba(16, 22, 44, 0.64);
  --md-default-fg-color--lighter: rgba(16, 22, 44, 0.34);
  --md-default-fg-color--lightest: rgba(16, 22, 44, 0.09);
  --md-typeset-color: rgba(16, 22, 44, 0.92);
  --md-primary-fg-color: #0f1a3a;
  --md-primary-fg-color--light: #2a3d78;
  --md-primary-fg-color--dark: #0a1230;
  --md-primary-bg-color: #ffffff;
  --md-primary-bg-color--light: #ffffffb3;
  --md-accent-fg-color: #b84a0c;
  --md-accent-fg-color--transparent: #b84a0c1a;
  --md-typeset-a-color: #1f5fbf;
  --md-code-bg-color: #eef1f8;
  --md-code-fg-color: #1c2340;
  --md-footer-bg-color: #0f1a3a;
  --md-footer-bg-color--dark: #0a1230;
  --md-typeset-table-color: rgba(16, 22, 44, 0.12);
  --table-head-bg: #eef1f8;
  --table-head-fg: #14182b;
  --table-row-hover: rgba(16, 22, 44, 0.035);
  --md-mermaid-node-bg-color: #e8eefb;
  --md-mermaid-node-fg-color: #14182b;
  --md-mermaid-edge-color: #4a5068;
  --md-mermaid-label-bg-color: #fbfbfd;
  --md-mermaid-label-fg-color: #14182b;
  --brand-accent: #e8651e;
  --viz-ink: #14182b;
  --viz-ink-2: #4a5068;
  --viz-muted: #898781;
  --viz-grid: #e6e8f0;
  --viz-axis: #c5c9d8;
  --viz-seq: #cde2fb,#9ec5f4,#6da7ec,#3987e5,#256abf,#184f95,#0d366b;
  --viz-seq-label: #ffffff;
  --viz-ord-1: #184f95;
  --viz-ord-2: #3987e5;
  --viz-ord-3: #86b6ef;
  --viz-s1: #2a78d6;
  --viz-s2: #eb6834;
  --viz-s3: #1baf7a;
  --viz-s4: #eda100;
  --viz-s5: #e87ba4;
  --viz-s6: #008300;
  --viz-s7: #4a3aa7;
  --viz-s8: #e34948;
}

body[data-md-color-scheme="slate"] {
  --md-default-bg-color: #0b1020;
  --md-default-bg-color--light: #0b1020;
  --md-default-fg-color: rgba(227, 231, 243, 0.92);
  --md-default-fg-color--light: rgba(227, 231, 243, 0.64);
  --md-default-fg-color--lighter: rgba(227, 231, 243, 0.34);
  --md-default-fg-color--lightest: rgba(227, 231, 243, 0.09);
  --md-typeset-color: rgba(227, 231, 243, 0.92);
  --md-primary-fg-color: #0e1633;
  --md-primary-fg-color--light: #25366b;
  --md-primary-fg-color--dark: #070b18;
  --md-primary-bg-color: #ffffff;
  --md-primary-bg-color--light: #ffffffb3;
  --md-accent-fg-color: #ff8a3d;
  --md-accent-fg-color--transparent: #ff8a3d1a;
  --md-typeset-a-color: #7fb0ff;
  --md-code-bg-color: #121a33;
  --md-code-fg-color: #d9def0;
  --md-footer-bg-color: #070b18;
  --md-footer-bg-color--dark: #05080f;
  --md-typeset-table-color: rgba(227, 231, 243, 0.12);
  --table-head-bg: #141d3b;
  --table-head-fg: #eef1fa;
  --table-row-hover: rgba(227, 231, 243, 0.035);
  --md-mermaid-node-bg-color: #16204a;
  --md-mermaid-node-fg-color: #eef1fa;
  --md-mermaid-edge-color: #b3bad1;
  --md-mermaid-label-bg-color: #0b1020;
  --md-mermaid-label-fg-color: #eef1fa;
  --brand-accent: #ff8a3d;
  --viz-ink: #eef1fa;
  --viz-ink-2: #b3bad1;
  --viz-muted: #898781;
  --viz-grid: #1c2440;
  --viz-axis: #2e3858;
  --viz-seq: #184f95,#1c5cab,#256abf,#2a78d6,#3987e5,#6da7ec,#9ec5f4;
  --viz-seq-label: #0b0d12;
  --viz-ord-1: #9ec5f4;
  --viz-ord-2: #5598e7;
  --viz-ord-3: #1c5cab;
  --viz-s1: #3987e5;
  --viz-s2: #d95926;
  --viz-s3: #199e70;
  --viz-s4: #c98500;
  --viz-s5: #d55181;
  --viz-s6: #008300;
  --viz-s7: #9085e9;
  --viz-s8: #e66767;
}


.md-header { background: linear-gradient(90deg, var(--md-primary-fg-color), var(--md-primary-fg-color--light)); }
.md-header::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 3px;
  background: linear-gradient(90deg, var(--brand-accent), #3fa9f5 60%, transparent); }
.md-typeset h2::before { content: ""; display: inline-block; width: .42em; height: .42em; margin: 0 .5em .12em 0;
  background: var(--brand-accent); transform: rotate(45deg); }
.md-nav__link--active { color: var(--brand-accent) !important; }

/* ======================================================================================
   Site components (shared with the sibling RL repos, restyled for Methalox Plume):
   hero, cards, widgets, the Engine Lab, previous/next pager, folding page sections.
   ====================================================================================== */
:root { --re-grad: linear-gradient(115deg, #0a1230 0%, #1d2f66 52%, #2a4f9e 78%, #c4561b 130%); }
body[data-md-color-scheme="default"] { --re-rule: #dfe3ee; --re-panel: #f4f6fb; }
body[data-md-color-scheme="slate"] { --re-rule: #232c4c; --re-panel: #10172e; }

/* home hero */
.re-hero { background: var(--re-grad); color: #fff; border-radius: 14px; padding: 1.6rem 1.8rem 1.4rem; margin: 0 0 1.6rem; position: relative; overflow: hidden; }
.re-hero::after { content: ""; position: absolute; right: -40px; bottom: -90px; width: 220px; height: 300px; border-radius: 50% 50% 45% 45%;
  background: radial-gradient(ellipse at 50% 20%, rgba(255, 170, 90, 0.55), rgba(232, 101, 30, 0.22) 45%, transparent 70%); filter: blur(2px); }
.re-hero h1 { color: #fff !important; margin: 0 0 0.3em; font-size: 1.75rem; }
.re-hero h1::before { display: none; }
.re-hero p { margin: 0.3em 0; max-width: 42rem; color: rgba(255, 255, 255, 0.92); position: relative; z-index: 1; }
.re-hero a { color: #fff; text-decoration: underline; }
.re-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 0.7rem; margin-top: 1.1rem; position: relative; z-index: 1; }
.re-stat { background: rgba(255, 255, 255, 0.10); border: 1px solid rgba(255, 255, 255, 0.22); border-radius: 10px; padding: 0.6rem 0.8rem; }
.re-stat b { display: block; font-family: var(--heading-font); font-size: 1.45rem; line-height: 1.2; color: #fff; }
.re-stat span { font-size: 0.64rem; color: rgba(255, 255, 255, 0.86); line-height: 1.35; display: block; }
.re-stat a { color: #fff; }

/* navigation cards and icons */
.md-typeset .grid.cards > ul > li { border-radius: 10px; transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s; }
.md-typeset .grid.cards > ul > li:hover { border-color: var(--md-accent-fg-color); box-shadow: 0 4px 18px rgba(232, 101, 30, 0.14); transform: translateY(-1px); }
.md-typeset .twemoji.lg svg { width: 1.7em; height: 1.7em; }
.md-typeset .twemoji.middle svg { vertical-align: middle; }
.md-typeset h1 .twemoji svg { width: 1.05em; height: 1.05em; vertical-align: -0.12em; color: var(--brand-accent); }
.md-typeset .grid.cards .twemoji svg { color: var(--brand-accent); }

/* interactive widgets */
.re-widget { margin: 1.4em 0 1.8em; padding: 0.9rem 1rem 0.8rem; border: 1px solid var(--re-rule); border-radius: 12px; background: var(--re-panel); }
.re-widget::before { content: attr(data-title); display: block; font-family: var(--heading-font); font-weight: 600; font-size: 0.8rem; margin-bottom: 0.5rem; color: var(--md-default-fg-color); }
.re-controls { display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; align-items: center; margin-bottom: 0.45rem; }
.re-ctl { display: inline-flex; align-items: center; gap: 0.45rem; font-size: 0.66rem; color: var(--md-default-fg-color--light); }
.re-ctl input[type="range"] { width: 130px; accent-color: var(--brand-accent); }
.re-ctl select { font: inherit; font-size: 0.66rem; background: transparent; color: var(--md-default-fg-color); border: 1px solid var(--re-rule); border-radius: 6px; padding: 0.1rem 0.3rem; }
.re-ctl-val { min-width: 3.6em; font-variant-numeric: tabular-nums; color: var(--md-default-fg-color); font-weight: 600; }
.re-btn, .re-chip { font: inherit; font-size: 0.64rem; padding: 0.22rem 0.65rem; border-radius: 999px; border: 1px solid var(--re-rule); background: transparent; color: var(--md-default-fg-color); cursor: pointer; }
.re-btn:hover, .re-chip:hover { border-color: var(--brand-accent); }
.re-btn.re-primary, .re-chip.on { background: var(--brand-accent); border-color: var(--brand-accent); color: #fff; }
.re-canvas { display: block; width: 100%; border-radius: 8px; touch-action: none; }
.re-note { font-size: 0.66rem; line-height: 1.55; color: var(--md-default-fg-color--light); margin-top: 0.45rem; }
.re-note b { color: var(--md-default-fg-color); }
.re-legend { display: flex; flex-wrap: wrap; gap: 0.2rem 0.9rem; font-size: 0.62rem; color: var(--md-default-fg-color--light); margin: 0.2rem 0; }
.re-legend i { display: inline-block; width: 1.1em; height: 0; border-top: 2.5px solid; margin-right: 0.35em; vertical-align: 0.25em; }
.re-legend i.dash { border-top-style: dashed; }
.re-readout { display: grid; grid-template-columns: repeat(auto-fill, minmax(6.8rem, 1fr)); gap: 0.25rem 0.5rem; margin-top: 0.45rem; }
.re-ro { font-size: 0.6rem; line-height: 1.3; padding: 0.25rem 0.4rem; border-radius: 6px; background: var(--md-code-bg-color); }
.re-ro span { display: block; color: var(--md-default-fg-color--light); }
.re-ro b { font-size: 0.8rem; font-variant-numeric: tabular-nums; }
.re-ro.bad { box-shadow: inset 3px 0 0 var(--viz-s8); }
.re-ro.ok { box-shadow: inset 3px 0 0 var(--viz-s3); }
.re-tag { display: inline-block; font-size: 0.58rem; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; padding: 0.05rem 0.45rem; border-radius: 999px; border: 1px solid var(--brand-accent); color: var(--brand-accent); }
.md-typeset a.re-try { font-size: 0.62rem; font-weight: 600; border: 1px solid var(--brand-accent); border-radius: 999px; padding: 0 0.5rem; white-space: nowrap; text-decoration: none; }
@media (max-width: 600px) { .re-ctl input[type="range"] { width: 100px; } .re-hero { padding: 1.2rem; } }

/* the Engine Lab: see the end of this file */

/* left navigation: sections, active page, folding table of contents (nav.js) */
.md-nav--primary > .md-nav__list > .md-nav__item--section { margin-top: 1.1em; }
.md-nav--primary > .md-nav__list > .md-nav__item--section:first-child { margin-top: 0.2em; }
.md-nav--primary > .md-nav__list > .md-nav__item--section > .md-nav__link {
  font-family: var(--heading-font); font-size: 0.6rem; font-weight: 700; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--md-default-fg-color--light); opacity: 1;
  padding-bottom: 0.35em; margin-bottom: 0.25em; border-bottom: 1px solid var(--re-rule);
}
.md-nav--primary .md-nav__item.re-has-toc { position: relative; }
.md-nav--primary .re-has-toc > label.md-nav__link[for="__toc"] { display: none !important; }
.md-nav--primary .re-has-toc > a.md-nav__link--active { display: flex !important; border-radius: 6px; padding-right: 2.2em; background: color-mix(in srgb, var(--brand-accent) 9%, transparent); }
.re-toc-toggle { position: absolute; right: 0.15em; top: 0.25em; width: 1.7em; height: 1.7em; padding: 0; display: inline-flex; align-items: center; justify-content: center;
  border: 0; border-radius: 6px; background: transparent; color: var(--md-default-fg-color--light); cursor: pointer; }
.re-toc-toggle:hover, .re-toc-toggle:focus-visible { color: var(--brand-accent); background: color-mix(in srgb, var(--brand-accent) 14%, transparent); outline: none; }
.re-toc-toggle svg { width: 1.1em; height: 1.1em; transition: transform 0.15s; }
.re-toc-open > .re-toc-toggle svg { transform: rotate(90deg); }
.md-nav--primary .re-has-toc > nav.md-nav--secondary { position: static !important; transform: none !important; opacity: 1 !important; visibility: visible !important;
  box-shadow: none !important; background: transparent !important; height: auto !important; margin: 0.2em 0 0.4em 0.75em; border-left: 2px solid var(--re-rule); }
.md-nav--primary .re-has-toc:not(.re-toc-open) > nav.md-nav--secondary { display: none !important; }
.md-nav--primary .re-has-toc > nav.md-nav--secondary > .md-nav__title { display: none !important; }
.md-nav--primary .re-has-toc > nav.md-nav--secondary .md-nav__link { font-size: 0.66rem; padding-left: 0.2em; margin-top: 0.35em; border: 0; }
.md-nav--primary .re-has-toc > nav.md-nav--secondary .md-nav__item { border: 0; padding: 0 0 0 0.5em; }
@media screen and (min-width: 76.25em) {
  .md-nav--primary > .md-nav__title { display: none; }
  .md-nav--primary .re-has-toc > a.md-nav__link--active { margin-left: -0.45em; padding: 0.25em 2.2em 0.25em 0.45em; }
}
@media screen and (max-width: 76.234em) {
  .md-nav--primary .re-has-toc > a.md-nav__link--active { margin: 0 0.6rem; padding: 0.6rem 2.6rem 0.6rem 0.6rem; }
  .re-toc-toggle { right: 0.8rem; top: 0.45rem; width: 2.2rem; height: 2.2rem; }
  .md-nav--primary .re-has-toc > nav.md-nav--secondary { margin: 0.2rem 0.8rem 0.6rem 1.6rem; }
}
@media (prefers-reduced-motion: reduce) { .re-toc-toggle svg { transition: none; } }

/* previous / next buttons (overrides/main.html) */
.re-pager { display: flex; justify-content: space-between; gap: 0.6rem; }
.re-pager--top { margin: -0.4rem 0 0.6rem; }
.re-pager__btn { display: inline-flex; align-items: center; gap: 0.25rem; max-width: 48%; min-width: 0; font-size: 0.62rem; color: var(--md-default-fg-color--light) !important;
  padding: 0.15rem 0.55rem 0.15rem 0.35rem; border: 1px solid var(--re-rule); border-radius: 999px; text-decoration: none; }
.re-pager__btn--next { margin-left: auto; padding: 0.15rem 0.35rem 0.15rem 0.55rem; }
.re-pager__btn:hover, .re-pager__btn:focus-visible { color: var(--brand-accent) !important; border-color: var(--brand-accent); }
.re-pager__label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.re-pager__arrow { width: 1.1em; height: 1.1em; flex: none; }
.re-pager--bottom { margin: 2.4rem 0 0.4rem; padding-top: 1rem; border-top: 1px solid var(--re-rule); }
.re-pager__card { flex: 1 1 0; min-width: 0; max-width: 50%; display: flex; align-items: center; gap: 0.6rem; padding: 0.7rem 0.9rem; border: 1px solid var(--re-rule);
  border-radius: 12px; text-decoration: none; color: var(--md-default-fg-color) !important; transition: border-color 0.15s, box-shadow 0.15s; }
.re-pager__card--next { margin-left: auto; justify-content: flex-end; text-align: right; }
.re-pager__card:hover, .re-pager__card:focus-visible { border-color: var(--brand-accent); box-shadow: 0 4px 16px rgba(232, 101, 30, 0.14); }
.re-pager__card .re-pager__arrow { width: 1.4rem; height: 1.4rem; color: var(--brand-accent); }
.re-pager__text { display: flex; flex-direction: column; min-width: 0; }
.re-pager__text small { font-size: 0.58rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--md-default-fg-color--light); }
.re-pager__title { display: inline-flex; align-items: center; gap: 0.35rem; font-family: var(--heading-font); font-weight: 600; font-size: 0.78rem; line-height: 1.3; }
.re-pager__card--next .re-pager__title { justify-content: flex-end; }
.re-pager__title svg.re-ic { width: 1.2em; height: 1.2em; flex: none; color: var(--brand-accent); }
@media (max-width: 600px) {
  .re-pager__btn .re-pager__label { max-width: 9.5rem; }
  .re-pager--bottom { flex-direction: column; }
  .re-pager__card { max-width: 100%; padding: 0.6rem; }
  .re-pager__card--next { margin-left: 0; }
}

/* stroke icons (overrides/.icons/re): Material fills twemoji SVGs, these are drawn with strokes */
svg.re-ic { fill: none !important; }
.md-nav__link svg.re-ic { color: var(--brand-accent); opacity: 0.85; margin-right: 0.15rem; }
.md-nav__link--active svg.re-ic, .md-nav__link:hover svg.re-ic { opacity: 1; }

/* ======================================================================================
   The Engine Lab (lab.js): one viewer around the test stand. "hud" mode floats glass panels
   over the scene (wide screens, full screen); "stack" mode puts them under it (phones).
   ====================================================================================== */
body:has(.re-lab) .md-grid { max-width: 100rem; }
.md-typeset .re-widget.re-lab { padding: 0; border: 0; background: none; margin: 0.6em 0 1.6em; }
.re-widget.re-lab::before { display: none; }
.re-lab { --lab-open: var(--viz-s4); --lab-fb: var(--viz-s3); --lab-rl: var(--viz-s7); --lab-you: var(--brand-accent);
  --glass: color-mix(in srgb, var(--re-panel) 84%, transparent); --glass-rule: color-mix(in srgb, var(--re-rule) 85%, transparent); }
.md-typeset .lab-disclaimer { font-size: 0.68rem; margin: -0.2rem 0 0.6rem; padding: 0.35rem 0.7rem; border-radius: 8px; border-left: 3px solid var(--brand-accent);
  background: color-mix(in srgb, var(--brand-accent) 7%, transparent); }

.lab-viewer { position: relative; outline: none; }
.lab-viewer:focus-visible { box-shadow: 0 0 0 2px var(--brand-accent); }
.lab-scene { position: relative; overflow: hidden; background: #0b1020; }
.lab-scene canvas.re-stand { width: 100%; border-radius: 0; }
.hud-ic { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; width: 1.05rem; height: 1.05rem; flex: none; }

/* glass surfaces */
.hud-panel, .hud-card, .hud-titlebox, .hud-tools, .hud-caption, .lab-transport {
  background: var(--glass); border: 1px solid var(--glass-rule); border-radius: 12px;
  -webkit-backdrop-filter: blur(12px) saturate(1.3); backdrop-filter: blur(12px) saturate(1.3); box-shadow: 0 8px 26px rgba(5, 10, 30, 0.16); }
body[data-md-color-scheme="slate"] .hud-panel, body[data-md-color-scheme="slate"] .hud-card { box-shadow: 0 8px 26px rgba(0, 0, 0, 0.4); }

/* top bar: status and title (left), tools (right) */
.hud-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 0.5rem; pointer-events: none; z-index: 4; }
.hud-top > * { pointer-events: auto; }
.hud-titlebox { display: flex; align-items: center; gap: 0.55rem; padding: 0.28rem 0.75rem 0.28rem 0.32rem; min-width: 0; max-width: 34rem; }
.hud-badge { font-size: 0.56rem; font-weight: 700; letter-spacing: 0.05em; color: #fff; padding: 0.24rem 0.62rem; border-radius: 999px; background: #1baf7a; white-space: nowrap; flex: none; transition: background 0.2s; }
.firing .hud-badge { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.5); animation: hud-glow 2s ease-out infinite; }
.hud-title { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.hud-title b { font-family: var(--heading-font); font-size: 0.72rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.hud-title span { font-size: 0.6rem; color: var(--md-default-fg-color--light); font-variant-numeric: tabular-nums; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.hud-tools { display: flex; gap: 0.1rem; padding: 0.2rem; flex: none; }
.hud-tool { all: unset; box-sizing: border-box; position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 0.3rem; height: 1.9rem; min-width: 1.9rem;
  padding: 0 0.5rem; border-radius: 9px; cursor: pointer; font-size: 0.62rem; font-weight: 600; color: var(--md-default-fg-color); }
.hud-tool:hover, .hud-tool:focus-visible { background: color-mix(in srgb, var(--brand-accent) 16%, transparent); color: var(--brand-accent); }
.hud-tool:focus-visible { outline: 2px solid var(--brand-accent); outline-offset: -2px; }
.hud-tool[aria-pressed="true"] { background: var(--brand-accent); color: #fff; }
.hud-az { font-weight: 800; font-size: 0.64rem; letter-spacing: -0.02em; line-height: 1; }
.hud-tool.news::after { content: ""; position: absolute; top: 0.25rem; right: 0.25rem; width: 0.42rem; height: 0.42rem; border-radius: 50%;
  background: var(--brand-accent); box-shadow: 0 0 0 2px var(--re-panel); animation: hud-blink 1.4s ease-in-out infinite; }
.hud-tool[aria-pressed="true"].news::after { display: none; }

/* panels: fold to their title */
.hud-panel { min-width: 0; color: var(--md-default-fg-color); }
.hud-head { all: unset; box-sizing: border-box; display: flex; align-items: center; gap: 0.45rem; width: 100%; padding: 0.42rem 0.6rem 0.42rem 0.75rem; cursor: pointer;
  font-family: var(--heading-font); font-weight: 600; font-size: 0.74rem; color: var(--md-default-fg-color); border-radius: 12px; }
.hud-head:hover .hud-ic, .hud-head:focus-visible .hud-ic { color: var(--brand-accent); }
.hud-head:focus-visible { outline: 2px solid var(--brand-accent); outline-offset: -2px; }
.hud-ttl { white-space: nowrap; }
.hud-sum { margin-left: auto; font-family: Inter, sans-serif; font-weight: 500; font-size: 0.6rem; color: var(--md-default-fg-color--light); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; font-variant-numeric: tabular-nums; }
.hud-panel:not(.closed) .hud-sum { display: none; }
.hud-panel:not(.closed) .hud-head .hud-ic { margin-left: auto; }
.hud-head .hud-ic { transition: transform 0.15s; color: var(--md-default-fg-color--light); }
.hud-panel.closed .hud-head .hud-ic { transform: rotate(-90deg); }
.hud-panel.perturbed .hud-sum { color: #c98500; font-weight: 700; }
.hud-pbody { padding: 0 0.7rem 0.6rem; }
.hud-panel.closed .hud-pbody { display: none; }
.hud-panel .re-ctl { display: flex; justify-content: space-between; align-items: center; margin: 0.12rem 0; font-size: 0.62rem; gap: 0.4rem; }
.hud-panel .re-ctl > span:first-child { white-space: nowrap; }
.hud-panel .re-ctl select { min-width: 0; flex: 1 1 auto; max-width: 11rem; }
/* sliders: the name and value on one line, the slider full width under them */
.hud-panel .re-ctl:has(input[type="range"]) { display: grid; grid-template-columns: 1fr auto; grid-template-areas: "name val" "range range"; row-gap: 0; margin: 0.18rem 0 0.1rem; }
.hud-panel .re-ctl:has(input[type="range"]) > span:first-child { grid-area: name; }
.hud-panel .re-ctl:has(input[type="range"]) > .re-ctl-val { grid-area: val; text-align: right; min-width: 0; }
.hud-panel .re-ctl input[type="range"] { grid-area: range; width: 100%; margin: 0.1rem 0 0; }
.hud-panel .re-note { font-size: 0.6rem; margin-top: 0.35rem; }
.lab-row { display: flex; flex-wrap: wrap; gap: 0.35rem 0.5rem; align-items: center; margin: 0.35rem 0 0.1rem; }

/* controller: presets grouped by who turns the knobs */
.lab-presets { display: grid; gap: 0.3rem; margin-bottom: 0.4rem; }
.lab-group { border-left: 3px solid var(--lab-fb); padding-left: 0.45rem; }
.lab-group.open { border-color: var(--lab-open); } .lab-group.rl { border-color: var(--lab-rl); } .lab-group.you { border-color: var(--lab-you); }
.lab-group > span { display: block; font-size: 0.52rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--md-default-fg-color--light); margin-bottom: 0.12rem; }
.lab-chips { display: flex; flex-wrap: wrap; gap: 0.22rem; }
.lab-chips .re-chip { font-size: 0.6rem; padding: 0.15rem 0.5rem; }
.lab-group.open .re-chip.on { background: var(--lab-open); border-color: var(--lab-open); }
.lab-group.fb .re-chip.on { background: var(--lab-fb); border-color: var(--lab-fb); }
.lab-group.rl .re-chip.on { background: var(--lab-rl); border-color: var(--lab-rl); }

/* telemetry */
.tel-gauge { height: 112px; }
.tel-reads { font-size: 0.58rem; color: var(--md-default-fg-color--light); margin: 0 0 0.35rem; text-align: center; }
.tel-reads b { color: var(--md-default-fg-color); font-variant-numeric: tabular-nums; font-weight: 600; }
.tel-limits { display: grid; gap: 0.24rem; margin-bottom: 0.35rem; }
.tel-lim { display: grid; grid-template-columns: 5.4rem 1fr 4.3rem; align-items: center; gap: 0.4rem; font-size: 0.58rem; color: var(--md-default-fg-color--light); }
.tel-lim b { text-align: right; color: var(--md-default-fg-color); font-variant-numeric: tabular-nums; font-weight: 600; }
.tel-bar { position: relative; height: 0.42rem; border-radius: 999px; background: var(--viz-grid); }
.tel-fill { position: absolute; left: 0; top: 0; bottom: 0; border-radius: 999px; background: var(--viz-s3); transition: width 0.12s linear, background 0.2s; }
.tel-lim.warn .tel-fill { background: var(--viz-s4); }
.tel-lim.bad .tel-fill { background: var(--viz-s8); }
.tel-lim.bad b, .tel-lim.bad > span:first-child { color: var(--viz-s8); }
.tel-mark { position: absolute; top: -0.2rem; bottom: -0.2rem; width: 2px; background: var(--viz-s8); border-radius: 1px; transform: translateX(-1px); }
.tel-spark { display: grid; grid-template-columns: 2.2rem 1fr; align-items: center; }
.tel-spark span { font-size: 0.56rem; color: var(--md-default-fg-color--light); font-weight: 600; }

/* score */
.lab-scores { display: grid; grid-template-columns: 1fr 1fr; gap: 0.3rem; }
.lab-score { border-radius: 8px; padding: 0.28rem 0.5rem; border: 1px solid var(--re-rule); }
.lab-score span { display: block; font-size: 0.54rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--md-default-fg-color--light); }
.lab-score b { font-family: var(--heading-font); font-size: 1rem; font-variant-numeric: tabular-nums; }
.lab-score small { color: var(--md-default-fg-color--light); font-size: 0.56rem; }

/* bottom: narration and transport */
.hud-bottom { display: flex; flex-direction: column; gap: 0.35rem; z-index: 2; }
.hud-caption { display: flex; align-items: flex-start; gap: 0.5rem; padding: 0.38rem 0.75rem; font-size: 0.68rem; line-height: 1.45; min-height: 1.95rem; }
.hud-caption[hidden] { display: none; }
.cap-dot { flex: none; width: 0.56rem; height: 0.56rem; border-radius: 50%; margin-top: 0.3rem; background: var(--viz-s3); }
.cap-dot.warn { background: var(--viz-s4); } .cap-dot.event { background: var(--brand-accent); } .cap-dot.idle { background: var(--viz-muted); }
.cap-dot.bad { background: var(--viz-s8); animation: hud-blink 0.8s ease-in-out infinite; }
.lab-transport { display: flex; flex-wrap: wrap; align-items: center; gap: 0.3rem 0.7rem; padding: 0.32rem 0.55rem; }
.lab-transport .re-ctl { font-size: 0.62rem; }
.hud-play { min-width: 6.2rem; }
.lab-tslider { flex: 1 1 10rem; min-width: 7rem; accent-color: var(--brand-accent); }
.lab-tlabel { font-size: 0.66rem; font-variant-numeric: tabular-nums; min-width: 4.8em; color: var(--md-default-fg-color); font-weight: 600; }
.hud-disclaimer { margin-left: auto; font-size: 0.56rem; line-height: 1.3; color: var(--md-default-fg-color--light); max-width: 21rem; }
.hud-disclaimer b { color: var(--md-default-fg-color); }
.hud-zoom { display: inline-flex; gap: 0.05rem; }
.hud-zoom .hud-tool { height: 1.7rem; min-width: 1.7rem; padding: 0; }

/* information cards */
.hud-cards { z-index: 5; pointer-events: none; }
.hud-card { pointer-events: auto; font-size: 0.66rem; line-height: 1.55; color: var(--md-default-fg-color); }
.hud-card[hidden] { display: none; }
.hud-chead { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; padding: 0.45rem 0.4rem 0.15rem 0.8rem; font-family: var(--heading-font); font-weight: 600; font-size: 0.78rem; }
.hud-x { all: unset; cursor: pointer; width: 1.7rem; height: 1.7rem; display: inline-grid; place-items: center; border-radius: 8px; color: var(--md-default-fg-color--light); }
.hud-x:hover, .hud-x:focus-visible { color: var(--brand-accent); background: color-mix(in srgb, var(--brand-accent) 14%, transparent); }
.hud-cbody { padding: 0 0.85rem 0.75rem; }
.md-typeset .hud-cbody p { margin: 0.45em 0; }
.md-typeset .hud-cbody h4 { margin: 0.9em 0 0.3em; font-size: 0.7rem; font-family: var(--heading-font); }
.md-typeset .hud-cbody ul { margin: 0.2em 0 0.4em 1.1em; padding: 0; }
.md-typeset .hud-cbody li { margin: 0.2em 0; }
.md-typeset .hud-cbody kbd { font-size: 0.58rem; }
.hud-more { color: var(--md-default-fg-color--light); }
.md-typeset .acr-group h4 { margin: 0.6em 0 0.25em; }
.md-typeset dl.acr-list { display: grid; grid-template-columns: max-content 1fr; gap: 0.18rem 0.7rem; margin: 0; }
.md-typeset dl.acr-list dt { font-weight: 700; font-family: var(--md-code-font-family, monospace); font-size: 0.6rem; color: var(--brand-accent); margin: 0; }
.md-typeset dl.acr-list dd { margin: 0; }
.hud-check { display: flex; gap: 0.55rem; align-items: flex-start; padding: 0.28rem 0; cursor: pointer; }
.hud-check input { margin-top: 0.2rem; accent-color: var(--brand-accent); }
.hud-check small { display: block; color: var(--md-default-fg-color--light); font-size: 0.6rem; }
.sw { display: inline-block; width: 0.9em; height: 0.5em; border-radius: 2px; margin: 0 0.25em 0 0.1em; vertical-align: 0.05em; }

/* hover / tap explanations on the stand (teststand.js) */
.re-stand-tip { position: absolute; z-index: 6; pointer-events: none; max-width: 280px; padding: 0.45rem 0.6rem; border-radius: 10px;
  background: color-mix(in srgb, var(--re-panel) 94%, transparent); border: 1px solid var(--re-rule); box-shadow: 0 6px 20px rgba(5, 10, 30, 0.2);
  font-size: 0.62rem; line-height: 1.45; color: var(--md-default-fg-color); }
.re-stand-tip[hidden] { display: none; }
.re-stand-tip b { display: block; font-family: var(--heading-font); font-size: 0.7rem; margin-bottom: 0.15rem; }
.re-stand-tip .v { display: block; font-variant-numeric: tabular-nums; color: var(--brand-accent); font-weight: 600; }
.re-stand-tip span:last-child { display: block; color: var(--md-default-fg-color--light); margin-top: 0.2rem; }

/* hud mode: panels docked at the edges of the scene */
.lab-viewer[data-mode="hud"] { height: clamp(540px, calc(100vh - 3.4rem), 900px); scroll-margin-top: 3rem; border-radius: 14px; overflow: hidden; border: 1px solid var(--re-rule); }
.lab-viewer[data-mode="hud"] .lab-scene { position: absolute; inset: 0; }
.lab-viewer[data-mode="hud"] .hud-top { position: absolute; top: 0.55rem; left: 0.55rem; right: 0.55rem; }
.lab-viewer[data-mode="hud"] .hud-bottom { position: absolute; left: 0.55rem; right: 0.55rem; bottom: 0.55rem; }
.lab-viewer[data-mode="hud"] .hud-dock { position: absolute; top: var(--hud-t, 3.3rem); bottom: var(--hud-b, 6rem); width: 14rem; z-index: 3;
  display: flex; flex-direction: column; gap: 0.5rem; overflow-y: auto; overflow-x: hidden; pointer-events: none; scrollbar-width: thin; padding: 0 2px 2px; }
.lab-viewer[data-mode="hud"] .hud-dock-l { left: 0.55rem; align-items: flex-start; }
.lab-viewer[data-mode="hud"] .hud-dock-r { right: 0.55rem; align-items: flex-end; }
.lab-viewer[data-mode="hud"] .hud-dock > .hud-panel { pointer-events: auto; width: 100%; flex: none; }
.lab-viewer[data-mode="hud"] .hud-dock > .hud-panel.closed { width: auto; max-width: 100%; }
.lab-viewer[data-mode="hud"] .hud-cards { position: absolute; top: var(--hud-t, 3.3rem); right: 0.55rem; width: min(21rem, 44%); max-height: calc(100% - var(--hud-t, 3.3rem) - var(--hud-b, 6rem)); overflow-y: auto; }
.lab-viewer.compact .hud-dock { width: 12.5rem; }
.lab-viewer.compact .hud-tool-t { display: none; }
/* short viewports (a phone held sideways in full screen): one-line narration, one-row transport */
.lab-viewer.compact .hud-long, .lab-viewer.compact .lab-transport .re-ctl > span:first-child:not(:has(*)) { display: none; }
.lab-viewer.compact .hud-caption { padding: 0.25rem 0.6rem; min-height: 0; }
.lab-viewer.compact .hud-caption > span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lab-viewer.compact .lab-transport { flex-wrap: nowrap; padding: 0.2rem 0.45rem; gap: 0.5rem; }
.lab-viewer.compact .hud-disclaimer { white-space: nowrap; }
.lab-viewer.compact .hud-bottom { gap: 0.25rem; }
.lab-viewer.compact .hud-top .hud-titlebox { max-width: 50%; }
.lab-viewer.compact .lab-transport .re-ctl { white-space: nowrap; }
.lab-viewer.compact .lab-tslider { min-width: 3rem; flex-basis: 5rem; }
.lab-viewer.compact .hud-play { min-width: 0; }
.lab-viewer.compact .hud-panel.closed .hud-sum { display: none; }
@media (max-width: 1180px) { .lab-viewer[data-mode="hud"] .hud-tool-t { display: none; } }

/* stack mode: the scene on top, everything else under it */
.lab-viewer[data-mode="stack"] { display: flex; flex-direction: column; gap: 0.5rem; }
.lab-viewer[data-mode="stack"] .lab-scene { height: clamp(220px, 64vw, 440px); border-radius: 12px; border: 1px solid var(--re-rule); }
.lab-viewer[data-mode="stack"] .hud-top { position: absolute; top: 0.4rem; left: 0.4rem; right: 0.4rem; }
.lab-viewer[data-mode="stack"] .hud-tools { justify-content: space-between; margin-top: -0.2rem; box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; background: var(--re-panel); }
.lab-viewer[data-mode="stack"] .hud-tool { flex: 1 1 auto; padding: 0 0.35rem; }
@media (max-width: 420px) { .lab-viewer[data-mode="stack"] .hud-tool[data-tool="layers"] .hud-tool-t, .lab-viewer[data-mode="stack"] .hud-tool[data-tool="about"] .hud-tool-t { display: none; } }
.lab-viewer[data-mode="stack"] .hud-titlebox { padding: 0.2rem; }
.lab-viewer[data-mode="stack"] .hud-dock { display: flex; flex-direction: column; gap: 0.5rem; }
.lab-viewer[data-mode="stack"] .hud-card, .lab-viewer[data-mode="stack"] .hud-panel { box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; background: var(--re-panel); }
.lab-viewer[data-mode="stack"] .hud-caption, .lab-viewer[data-mode="stack"] .lab-transport { box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; background: var(--re-panel); }

@media (max-width: 560px) {
  .lab-viewer[data-mode="stack"] .hud-title { display: none; }
  .lab-viewer[data-mode="stack"] .hud-titlebox { background: none; border: 0; -webkit-backdrop-filter: none; backdrop-filter: none; }
  .hud-disclaimer { margin-left: 0; max-width: none; }
}

/* full screen (real, or a fixed layer where the browser cannot) */
html.lab-full-open, html.lab-full-open body { overflow: hidden; }
.lab-viewer.is-full { position: fixed !important; inset: 0; z-index: 1000; height: 100vh !important; height: 100dvh !important; border-radius: 0 !important; border: 0 !important; background: var(--md-default-bg-color); }
.lab-viewer.is-full[data-mode="stack"] { overflow-y: auto; padding: 0.5rem; }
.lab-viewer.is-full[data-mode="stack"] .lab-scene { height: 60dvh; }

/* the plots under the viewer */
.lab-plots-title { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.2rem 0.7rem; margin: 1.2rem 0 0.5rem; font-family: var(--heading-font); font-weight: 600; font-size: 0.85rem; }
.lab-plots-title span { font-family: Inter, sans-serif; font-weight: 400; font-size: 0.64rem; color: var(--md-default-fg-color--light); }
.lab-plots { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 30rem), 1fr)); gap: 0.7rem; }
.lab-wide { grid-column: 1 / -1; }
.lab-panel { border: 1px solid var(--re-rule); border-radius: 12px; padding: 0.55rem 0.7rem 0.6rem; background: var(--re-panel); min-width: 0; }
.lab-title { font-family: var(--heading-font); font-weight: 600; font-size: 0.74rem; margin-bottom: 0.3rem; display: flex; justify-content: space-between; align-items: center; gap: 0.3rem; }

@keyframes hud-blink { 50% { opacity: 0.3; } }
@keyframes hud-glow { 0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.45); } 70%, 100% { box-shadow: 0 0 0 6px rgba(255, 255, 255, 0); } }
@media (prefers-reduced-motion: reduce) {
  .hud-tool.news::after, .cap-dot.bad, .firing .hud-badge { animation: none; }
  .hud-head .hud-ic, .tel-fill { transition: none; }
}

/* ======================================================================================
   Home page: the foundation citation, curated source cards, the reading route, references
   ====================================================================================== */
.re-eyebrow { font-family: var(--heading-font); font-size: 0.6rem !important; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--brand-accent); margin: 0 0 0.2rem !important; }
.md-typeset .re-foundation { position: relative; margin: 0 0 1.6rem; padding: 1rem 1.3rem 0.6rem 1.4rem; border-radius: 14px; border: 1px solid var(--re-rule);
  background: linear-gradient(135deg, color-mix(in srgb, var(--brand-accent) 7%, var(--re-panel)) 0%, var(--re-panel) 55%); overflow: hidden; }
.md-typeset .re-foundation::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: linear-gradient(180deg, var(--brand-accent), #3fa9f5); }
.md-typeset .re-foundation h2 { margin: 0 0 0.6rem; font-size: 1.15rem; }
.md-typeset .re-foundation h2::before { display: none; }
.md-typeset .re-foundation ul { margin-left: 0.4rem; }
.md-typeset .re-foundation li { margin-bottom: 0.45em; }
.md-typeset .re-foundation details { margin: 0.6rem 0 0.8rem; }

/* curated source cards */
.md-typeset .re-sources > ul > li, .md-typeset .re-route > ul > li { display: flex; flex-direction: column; }
.md-typeset .re-sources > ul > li > hr, .md-typeset .re-route > ul > li > hr { margin: 0.5rem 0 0.6rem; }
.md-typeset .re-sources .re-src-meta { display: block; font-size: 0.62rem; letter-spacing: 0.02em; color: var(--md-default-fg-color--light); line-height: 1.4; }
.md-typeset .re-sources > ul > li > p { margin: 0.35em 0; }
.md-typeset .re-sources > ul > li > p > em:only-child { font-family: var(--heading-font); font-style: normal; font-weight: 600; font-size: 0.74rem; line-height: 1.35; color: var(--md-default-fg-color); }
.md-typeset .re-sources blockquote { margin: 0.4rem 0; padding: 0.35rem 0.7rem; border-left: 3px solid var(--brand-accent); border-radius: 0 8px 8px 0;
  background: color-mix(in srgb, var(--brand-accent) 6%, transparent); color: var(--md-default-fg-color); font-size: 0.68rem; font-style: italic; }
.md-typeset .re-sources blockquote p { margin: 0; }
.md-typeset .re-sources > ul > li > p:last-child { margin-top: auto; padding-top: 0.45rem; display: flex; flex-wrap: wrap; gap: 0.35rem; }
.md-typeset a.re-src-link { display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.62rem; font-weight: 600; padding: 0.15rem 0.6rem 0.15rem 0.45rem;
  border: 1px solid var(--re-rule); border-radius: 999px; text-decoration: none; color: var(--md-default-fg-color); }
.md-typeset a.re-src-link:hover, .md-typeset a.re-src-link:focus-visible { border-color: var(--brand-accent); color: var(--brand-accent); }
.md-typeset a.re-src-link .twemoji svg { width: 1em; height: 1em; color: var(--brand-accent); }
.md-typeset .re-sources > ul > li > p:first-child { margin-top: 0; }

/* the reading route: numbered steps in navigation order */
.md-typeset .re-route > ul { counter-reset: none; }
.md-typeset .re-route > ul > li > p:first-child strong { font-family: var(--heading-font); }
.md-typeset .re-route > ul > li > p:last-child { margin-top: auto; }
.md-typeset .re-route > ul > li > p:last-child .twemoji svg { width: 1em; height: 1em; }

/* references at the end of the home page */
.md-typeset .re-endrefs { padding: 0.9rem 1.1rem; border: 1px solid var(--re-rule); border-radius: 14px; background: var(--re-panel); }
.md-typeset .re-endrefs p { margin: 0.4em 0; }
.md-typeset .re-endrefs .md-button { font-size: 0.66rem; padding: 0.35em 1em; margin: 0.15rem 0.25rem 0.15rem 0; display: inline-flex; align-items: center; gap: 0.35rem; }
.md-typeset .re-endrefs .md-button .twemoji svg { width: 1.05em; height: 1.05em; }
.md-typeset .re-endrefs p:last-child { font-size: 0.64rem; color: var(--md-default-fg-color--light); line-height: 1.7; }

/* icons inside buttons and running text (drawn, so they look the same in every font) */
.re-btn > .hud-ic { width: 1.05em; height: 1.05em; vertical-align: -0.17em; }
.re-note .hud-ic, .hud-keys .hud-ic { width: 1.15em; height: 1.15em; vertical-align: -0.22em; color: #c98500; }

/* three source cards, and the nine route steps, per row on wide screens */
.md-typeset .grid.cards.re-sources, .md-typeset .grid.cards.re-route { grid-template-columns: repeat(auto-fill, minmax(min(100%, 13rem), 1fr)); }

/* acronyms with tooltips (includes/abbreviations.md): a quiet dotted underline, stronger on hover */
.md-typeset abbr[title] { text-decoration: underline dotted; text-decoration-color: color-mix(in srgb, currentColor 35%, transparent); text-underline-offset: 0.18em; border-bottom: 0; cursor: help; }
.md-typeset abbr[title]:hover { text-decoration-color: var(--brand-accent); }
.re-hero abbr[title] { text-decoration-color: rgba(255, 255, 255, 0.4); }

/* ======================================================================================
   Lab: earlier agents, the PI's bandwidth, test cases and faults, the scoreboard
   ====================================================================================== */
.re-lab { --lab-old: var(--viz-s5); --fault: #e0245e; }
.lab-group.old { border-color: var(--lab-old); }
.lab-group.old .re-chip.on { background: var(--lab-old); border-color: var(--lab-old); }
.hud-panel select:disabled, .hud-panel input:disabled, .hud-panel button:disabled { opacity: 0.45; cursor: not-allowed; }
.lab-locked:empty { display: none; }

/* PI: gains, margins, loop gain */
.pi-info { display: grid; gap: 0.25rem; margin: 0.4rem 0 0.3rem; }
.pi-loop { display: grid; grid-template-columns: auto 1fr; gap: 0 0.5rem; font-size: 0.58rem; line-height: 1.4; padding: 0.25rem 0.45rem; border-radius: 8px;
  background: var(--md-code-bg-color); box-shadow: inset 3px 0 0 var(--viz-s3); color: var(--md-default-fg-color--light); }
.pi-loop b { grid-row: span 2; align-self: center; color: var(--md-default-fg-color); font-size: 0.6rem; }
.pi-loop span { font-variant-numeric: tabular-nums; }
.pi-loop.warn { box-shadow: inset 3px 0 0 var(--viz-s4); }
.pi-loop.bad { box-shadow: inset 3px 0 0 var(--viz-s8); }
.pi-loop.bad span:last-child { color: var(--viz-s8); font-weight: 600; }
.pi-bode { height: 104px; margin-top: 0.2rem; }

/* faults */
.fault-list { display: flex; flex-wrap: wrap; gap: 0.25rem; margin: 0.35rem 0; }
.fault-chip { display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.58rem; font-weight: 600; padding: 0.15rem 0.3rem 0.15rem 0.45rem; border-radius: 999px;
  color: #fff; background: var(--fault); }
.fault-chip .hud-ic { width: 0.9rem; height: 0.9rem; }
.fault-x { all: unset; cursor: pointer; display: inline-grid; place-items: center; width: 1rem; height: 1rem; border-radius: 50%; background: rgba(255, 255, 255, 0.2); }
.fault-x .hud-ic { width: 0.7rem; height: 0.7rem; }
.fault-free { border-top: 1px dashed var(--re-rule); margin-top: 0.3rem; padding-top: 0.3rem; }
.fault-free[hidden] { display: none; }
.hud-panel[data-panel="fault"].perturbed .hud-sum { color: var(--fault); }
.hud-badge.fault { background: repeating-linear-gradient(-45deg, #c2185b 0 7px, #8e0f42 7px 14px) !important; animation: hud-blink 1.2s ease-in-out infinite; }
.hud-flag { display: inline-flex; align-items: center; gap: 0.25rem; font-size: 0.56rem; font-weight: 700; color: #fff; background: var(--fault); padding: 0.2rem 0.55rem;
  border-radius: 999px; white-space: nowrap; animation: hud-blink 1s ease-in-out infinite; }
.hud-flag[hidden] { display: none; }
.hud-flag .hud-ic { width: 0.85rem; height: 0.85rem; }
.tel-faults:empty { display: none; }
.tel-faults { display: grid; gap: 0.2rem; margin-bottom: 0.4rem; }
.tel-fault { display: grid; grid-template-columns: auto 1fr 3.4rem 2.4rem; align-items: center; gap: 0.35rem; font-size: 0.58rem; color: var(--fault); font-weight: 600; }
.tel-fault .hud-ic { width: 0.9rem; height: 0.9rem; }
.tel-fault .tel-fill { background: var(--fault); }
.tel-fault b { text-align: right; font-variant-numeric: tabular-nums; }

/* fault onsets on the time slider */
.lab-tslider-wrap { position: relative; flex: 1 1 10rem; min-width: 7rem; display: flex; align-items: center; }
.lab-tslider-wrap .lab-tslider { flex: 1; min-width: 0; }
.lab-tmarks { position: absolute; left: 8px; right: 8px; top: 50%; height: 0; pointer-events: none; }
.lab-tmarks i { position: absolute; top: -9px; width: 3px; height: 18px; margin-left: -1.5px; border-radius: 2px; background: var(--fault); box-shadow: 0 0 0 1px var(--re-panel); }
.lab-viewer.compact .lab-tslider-wrap { min-width: 3rem; flex-basis: 5rem; }

/* the scoreboard: every controller through every test case */
.hud-modal { z-index: 7; color: var(--md-default-fg-color); font-size: 0.64rem;
  background: color-mix(in srgb, var(--re-panel) 94%, transparent); border: 1px solid var(--glass-rule); border-radius: 14px;
  -webkit-backdrop-filter: blur(14px) saturate(1.3); backdrop-filter: blur(14px) saturate(1.3); box-shadow: 0 16px 48px rgba(5, 10, 30, 0.3); }
.hud-modal[hidden] { display: none; }
.lab-viewer[data-mode="hud"] .hud-modal { position: absolute; top: var(--hud-t, 3.3rem); bottom: var(--hud-b, 6rem); left: 50%; transform: translateX(-50%); width: min(62rem, calc(100% - 1.2rem)); overflow: auto; }
.lab-viewer[data-mode="stack"] .hud-modal { order: 2; overflow-x: auto; box-shadow: none; }
.tests-prog { height: 4px; border-radius: 999px; background: var(--viz-grid); margin: 0.4rem 0 0.5rem; overflow: hidden; }
.tests-prog i { display: block; height: 100%; width: 0; background: var(--brand-accent); transition: width 0.1s linear; }
.tests-status { font-size: 0.6rem; color: var(--md-default-fg-color--light); font-variant-numeric: tabular-nums; }
.tests-table { overflow-x: auto; }
.tests-table.stale { opacity: 0.55; }
.md-typeset .tests-table table { display: table; width: 100%; border-collapse: separate; border-spacing: 3px; font-size: 0.6rem; margin: 0; border: 0; box-shadow: none; }
.md-typeset .tests-table th, .md-typeset .tests-table td { padding: 0.3rem 0.35rem; border: 0; text-align: center; vertical-align: middle; line-height: 1.25; }
.md-typeset .tests-table thead th { background: none; font-weight: 600; color: var(--md-default-fg-color); min-width: 4.4rem; }
.md-typeset .tests-table thead th b { display: block; font-family: var(--heading-font); font-size: 0.8rem; }
.md-typeset .tests-table thead th small { display: block; font-weight: 400; font-size: 0.52rem; color: var(--md-default-fg-color--light); }
.md-typeset .tests-table tbody th { text-align: left; white-space: nowrap; font-weight: 600; background: none; }
.md-typeset .tests-table tbody th small { display: block; font-weight: 400; color: var(--md-default-fg-color--light); font-size: 0.52rem; margin-left: 0.9rem; }
.md-typeset .tests-table tbody th .dot { display: inline-block; width: 0.5rem; height: 0.5rem; border-radius: 50%; margin-right: 0.4rem; background: var(--lab-fb); }
.md-typeset .tests-table tr.g-open th .dot { background: var(--lab-open); } .md-typeset .tests-table tr.g-rl th .dot { background: var(--lab-rl); }
.md-typeset .tests-table tr.g-old th .dot { background: var(--lab-old); }
.md-typeset .tests-table td { border-radius: 8px; cursor: pointer; min-width: 4.4rem; transition: transform 0.1s; }
.md-typeset .tests-table td:hover { transform: scale(1.05); box-shadow: 0 0 0 2px var(--brand-accent); }
.md-typeset .tests-table td b { display: block; font-family: var(--heading-font); font-size: 0.78rem; font-variant-numeric: tabular-nums; }
.md-typeset .tests-table td small { display: block; font-size: 0.52rem; opacity: 0.85; font-variant-numeric: tabular-nums; }
.md-typeset .tests-table td small.over { display: inline-block; white-space: nowrap; color: #fff; background: var(--viz-s8); border-radius: 999px; margin-top: 0.1rem; padding: 0 0.35rem; opacity: 1; font-size: 0.5rem; }
.md-typeset .tests-table td.empty { color: var(--md-default-fg-color--lighter); background: var(--md-code-bg-color); cursor: default; }
.md-typeset .tests-table td.h1 { background: color-mix(in srgb, var(--viz-s3) 30%, transparent); }
.md-typeset .tests-table td.h2 { background: color-mix(in srgb, var(--viz-s3) 14%, transparent); }
.md-typeset .tests-table td.h3 { background: color-mix(in srgb, var(--viz-s4) 22%, transparent); }
.md-typeset .tests-table td.h4 { background: color-mix(in srgb, var(--viz-s2) 26%, transparent); }
.md-typeset .tests-table td.h5 { background: color-mix(in srgb, var(--viz-s8) 34%, transparent); }
.md-typeset .tests-table td.best { box-shadow: inset 0 0 0 2px var(--viz-s3); }

/* Dropdowns: the open list is drawn by the browser, not by the page. Give the options the page's colours
   (Chrome, Edge and Firefox honour them) and declare the colour scheme, so native menus (macOS, Safari)
   follow light or dark mode too. Otherwise dark mode shows light text on the browser's white list. */
body[data-md-color-scheme="default"] select { color-scheme: light; }
body[data-md-color-scheme="slate"] select { color-scheme: dark; }
select option, select optgroup { background-color: var(--md-default-bg-color); color: var(--md-default-fg-color); }
select option:checked { background-color: color-mix(in srgb, var(--brand-accent) 28%, var(--md-default-bg-color)); }
select option:disabled { color: var(--md-default-fg-color--light); }