/* ThrustLab 23-06 — consolidated stylesheet (extracted in source order) */

/* ═══════════════════════════════════════════════════════════════════
   THRUSTLAB — DESIGN SYSTEM
   Deep navy · warm off-white · antique gold. Desktop-first, 1280–2560.
   ═══════════════════════════════════════════════════════════════════ */
:root {
  /* Backgrounds — neutral near-black, lifted slightly off pure #000 (DRDO/NASA console) */
  --bg-primary:     #0A0B0D;
  --bg-secondary:   #121519;
  --bg-tertiary:    #1B1F25;
  --bg-overlay:     rgba(10, 11, 13, 0.86);

  /* Text — clean cool white, no warm tint */
  --text-primary:   #E9ECEF;
  --text-secondary: rgba(233, 236, 239, 0.62);
  --text-muted:     rgba(233, 236, 239, 0.36);

  /* Accent — single restrained institutional blue */
  --accent:         #6E9AD1;
  --accent-dim:     rgba(110, 154, 209, 0.24);
  --accent-glow:    rgba(110, 154, 209, 0.08);

  /* Structural */
  --border:         rgba(233, 236, 239, 0.10);
  --border-strong:  rgba(233, 236, 239, 0.20);
  --border-accent:  rgba(110, 154, 209, 0.42);

  /* Status */
  --status-warn:    #D8922B;
  --status-ok:      #4F9D78;
  --status-err:     #C8453F;

  /* 3D scene background */
  --scene-bg:       #08090B;

  /* Type — IBM Plex superfamily: technical, institutional, intentional */
  --font-display:   'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-serif:     'IBM Plex Serif', Georgia, 'Times New Roman', serif;
  --font-body:      'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-mono:      'IBM Plex Mono', 'SFMono-Regular', 'Courier New', monospace;
  --font-hand:      'IBM Plex Mono', 'Courier New', monospace;
}

[data-theme="light"] {
  /* Backgrounds — clean cool white, only slightly dulled off pure #FFF (government sheet) */
  --bg-primary:     #FBFBFC;
  --bg-secondary:   #F1F3F5;
  --bg-tertiary:    #E6E9ED;
  --bg-overlay:     rgba(251, 251, 252, 0.93);
  --text-primary:   #0C1116;
  --text-secondary: rgba(12, 17, 22, 0.82);
  --text-muted:     rgba(12, 17, 22, 0.56);
  --accent:         #1B4D8C;
  --accent-dim:     rgba(27, 77, 140, 0.18);
  --accent-glow:    rgba(27, 77, 140, 0.06);
  --border:         rgba(12, 17, 22, 0.13);
  --border-strong:  rgba(12, 17, 22, 0.26);
  --border-accent:  rgba(27, 77, 140, 0.46);
  --scene-bg:       #EEF1F4;
}

/* Institutional display type: upright and technical, not elegant serif-italic */
.dash-toolbar .dt-title { font-style: normal; font-weight: 600; letter-spacing: -0.005em; }
#topnav .nav-brand, #topnav .nav-brand em { font-style: normal; }

* {
  margin: 0; padding: 0; box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

html { scroll-behavior: auto; }
html, body { background: var(--bg-primary); }

body {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--text-primary);
  overflow-x: hidden;
  transition: background-color .6s ease, color .6s ease;
}
@media (max-width: 1366px) { body { font-size: 14px; } }
@media (min-width: 2400px) { body { font-size: 18px; } }

::selection { background: var(--accent-dim); color: var(--text-primary); }

/* Grain overlay — fixed, above everything, never on the 3D canvas */
body::after {
  content: '';
  position: fixed; inset: 0; z-index: 9990;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.04;
}

/* Scrollbar */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--bg-tertiary); border-radius: 5px; border: 2px solid var(--bg-primary); }
::-webkit-scrollbar-thumb:hover { background: var(--accent-dim); }

/* ───────────────────────────────────────────────
   VIEWPORT GATE (< 1024px)
   ─────────────────────────────────────────────── */
#viewport-gate {
  display: none;
  position: fixed; inset: 0; z-index: 99999;
  background: var(--bg-primary);
  text-align: center;
  padding: 0 32px;
}
#viewport-gate .vg-inner { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); width: 100%; }
#viewport-gate h1 { font-family: var(--font-display); font-style: italic; font-weight: 700; font-size: 2.6rem; margin-bottom: 1rem; }
#viewport-gate p { color: var(--text-secondary); max-width: 40ch; margin: 0 auto; }
@media (max-width: 1023px) {
  #viewport-gate { display: block; }
  #app, #entry-root, #gl-stage { display: none !important; }
}

/* ───────────────────────────────────────────────
   3D STAGE — fixed canvas behind everything
   ─────────────────────────────────────────────── */
#gl-stage {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none;
  background: transparent;
}
#gl-stage canvas { display: block; width: 100%; height: 100%; }
#gl-vignette {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 42%, rgba(0,5,12,0.0) 60%, rgba(0,5,12,0.85) 100%);
  opacity: 0;
}
#gl-dim {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background: var(--bg-primary);
  opacity: 0;
  transition: background-color .6s ease;
}

/* Station label overlays during the strip / schematic beats */
.sta3d {
  position: fixed; z-index: 40;
  transform: translate(-50%, -50%);
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  opacity: 0; pointer-events: none;
}
.sta3d .sta3d-dot {
  width: 26px; height: 26px; border-radius: 50%;
  border: 1px solid var(--border-accent);
  background: rgba(0, 17, 34, 0.72);
  color: var(--accent);
  font-family: var(--font-mono); font-size: 12px; font-weight: 500;
  display: flex; align-items: center; justify-content: center;
}
.sta3d .sta3d-name {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .08em;
  color: var(--text-secondary); text-transform: uppercase; white-space: nowrap;
}

/* ───────────────────────────────────────────────
   ENTRY SEQUENCE — BEATS 1 & 2 OVERLAYS
   ─────────────────────────────────────────────── */
/* Loading/cinematic entry overlay removed — land straight on the hero. */
#entry-root { display: none !important; }
#entry-root.done { display: none; }
#skip-intro, #beat-loading, #beat-ready, #beat-title, #video-intro { display: none !important; }

#beat-loading {
  position: absolute; inset: 0;
  background: #000000;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 22px;
}
#beat-loading .monogram {
  font-family: var(--font-mono); font-size: 14px; letter-spacing: .5em;
  color: #F5F0E8; opacity: 0;
  padding-left: .5em;
}
#beat-loading .load-line-track { width: 240px; height: 1px; background: rgba(245,240,232,0.10); position: relative; }
#beat-loading .load-line { position: absolute; left: 0; top: 0; height: 1px; width: 0%; background: #C8A96E; transition: background-color .4s ease; }
#beat-loading .load-line.complete { background: #5BA888; }
#beat-loading .load-caption {
  font-family: var(--font-body); font-size: 10px; letter-spacing: .25em; text-transform: uppercase;
  color: rgba(245,240,232,0.35);
}
#beat-loading .load-pct { font-family: var(--font-mono); font-size: 10px; color: rgba(245,240,232,0.28); }

#beat-ready {
  position: absolute; inset: 0;
  background: #000000;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 26px;
  opacity: 0; visibility: hidden;
  cursor: crosshair;
}
#beat-ready .jet-silhouette {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -46%);
  width: min(72vw, 1080px); opacity: 0.08;
  transition: transform 4s cubic-bezier(0.22,1,0.36,1);
  pointer-events: none;
}
#beat-ready:hover .jet-silhouette { transform: translate(-50%, -52%); }
#beat-ready h1 {
  font-family: var(--font-display); font-style: italic; font-weight: 700;
  font-size: clamp(4rem, 6vw, 5.5rem); letter-spacing: -0.03em; line-height: 0.95;
  color: #F5F0E8;
}
#beat-ready .enter-cue {
  font-family: var(--font-body); font-weight: 500; font-size: 11px;
  letter-spacing: .2em; text-transform: uppercase; color: #C8A96E;
  display: flex; align-items: center; gap: 10px;
}
#beat-ready .enter-cue .cue-arrow { display: inline-block; animation: cue-bob 2.2s cubic-bezier(0.45,0,0.55,1) infinite; }
@keyframes cue-bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(6px); } }

#beat-title {
  position: fixed; left: 0; right: 0; bottom: 9vh; z-index: 9100;
  text-align: center; pointer-events: none; opacity: 0;
}
#beat-title .bt-rule { width: 220px; height: 1px; background: var(--accent); margin: 0 auto 20px; transform: scaleX(0); }
#beat-title h1 {
  font-family: var(--font-display); font-style: italic; font-weight: 700;
  font-size: clamp(4rem, 6.5vw, 7rem); letter-spacing: -0.03em; line-height: 0.95;
  color: var(--text-primary);
}
#beat-title .bt-sub {
  margin-top: 10px;
  font-family: var(--font-body); font-weight: 500; font-size: 11px;
  letter-spacing: .22em; text-transform: uppercase; color: var(--text-secondary);
}

#skip-intro {
  position: fixed; right: 28px; bottom: 24px; z-index: 9500;
  background: transparent; border: 1px solid rgba(245,240,232,0.18);
  color: rgba(245,240,232,0.55);
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase;
  padding: 8px 16px; cursor: pointer; border-radius: 2px;
  transition: color .25s ease, border-color .25s ease;
}
#skip-intro:hover { color: #C8A96E; border-color: rgba(200,169,110,0.5); }

#flash-frame { position: fixed; inset: 0; z-index: 9400; background: #fff; opacity: 0; pointer-events: none; }

/* ───────────────────────────────────────────────
   READING PROGRESS + NAV + TOC
   ─────────────────────────────────────────────── */
#read-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  background: var(--accent); z-index: 8600;
  transition: width 50ms linear;
}

#topnav {
  position: fixed; top: 0; left: 0; right: 0; height: 52px; z-index: 8500;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px;
  background: color-mix(in srgb, var(--bg-primary) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 0.5px solid var(--border);
  transform: translateY(0);
}
#topnav .nav-brand {
  font-family: var(--font-display); font-style: italic; font-weight: 600; font-size: 19px;
  color: var(--text-primary); text-decoration: none; letter-spacing: -0.01em;
}
#topnav .nav-brand em { color: var(--accent); font-style: italic; }
#topnav .nav-dots { display: flex; gap: 14px; align-items: center; }
#topnav .nav-dot {
  width: 8px; height: 8px; border-radius: 50%;
  border: 1px solid var(--text-muted); background: transparent;
  cursor: pointer; padding: 0; transition: all .25s ease;
}
#topnav .nav-dot:hover { border-color: var(--accent); }
#topnav .nav-dot.active { background: var(--accent); border-color: var(--accent); }
/* — nav dots rendered as labelled tabs — */
#topnav .nav-dot.nav-tab {
  width: auto; height: auto; border-radius: 999px;
  padding: 5px 11px; border-color: transparent;
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--text-secondary);
}
#topnav .nav-dot.nav-tab:hover { color: var(--text-primary); border-color: var(--border-accent); }
#topnav .nav-dot.nav-tab.active { background: var(--accent-dim); border-color: var(--accent); color: var(--text-primary); }
/* — beta badge — */
.beta-tag {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--accent);
  border: 1px solid var(--border-accent); border-radius: 3px;
  padding: 1px 5px; vertical-align: middle; margin-left: 6px;
}
/* — footer credit line — */
#site-footer .f-credit {
  width: 100%; margin-top: 14px; text-align: right;
  font-family: var(--font-body); font-size: 11.5px;
  color: var(--text-secondary); letter-spacing: .02em;
}
#site-footer .f-disclaimer {
  width: 100%; margin-top: 10px; text-align: right;
  font-family: var(--font-body); font-size: 10.5px; line-height: 1.6;
  color: var(--text-muted); letter-spacing: .01em;
}
/* — live state echo at top of worked solution — */
.worked-body .worked-state {
  font-family: var(--font-mono); font-size: 11px; color: var(--text-secondary);
  padding: 8px 11px; margin-bottom: 12px; border: 1px solid var(--border);
  border-radius: 4px; background: var(--bg-tertiary); line-height: 1.7;
}
.worked-body .worked-state b { color: var(--accent); font-weight: 500; }
#topnav .nav-actions { display: flex; gap: 10px; align-items: center; }
.nav-btn {
  background: transparent; border: 1px solid var(--border-strong);
  color: var(--text-secondary); font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase;
  padding: 6px 12px; cursor: pointer; border-radius: 2px;
  transition: color .2s ease, border-color .2s ease;
}
.nav-btn:hover { color: var(--accent); border-color: var(--border-accent); }
.nav-btn.icon { width: 32px; height: 28px; padding: 0; display: inline-flex; align-items: center; justify-content: center; font-size: 13px; }

#toc {
  position: fixed; left: 40px; top: 50%; transform: translateY(-50%);
  width: 200px; z-index: 8400; opacity: 0; pointer-events: none;
  transition: opacity .4s ease;
}
#toc.visible { opacity: 1; pointer-events: auto; }
@media (max-width: 1680px) { #toc { display: none; } }
#toc .toc-h { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .22em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 14px; }
#toc a {
  display: block; padding: 5px 0 5px 14px;
  font-size: 13px; color: var(--text-secondary); text-decoration: none;
  border-left: 1px solid var(--border);
  transition: color .2s ease, border-color .2s ease;
}
#toc a:hover { color: var(--accent); }
#toc a.active { color: var(--text-primary); border-left-color: var(--accent); }

/* ───────────────────────────────────────────────
   APP SHELL · SECTIONS · TYPOGRAPHY
   ─────────────────────────────────────────────── */
#app { position: relative; z-index: 10; opacity: 1; }
#app.ready { opacity: 1; }

.section { padding: clamp(4rem, 8vh, 10rem) 0; position: relative; }
.section-inner { max-width: 1280px; margin: 0 auto; padding: 0 60px; }

.chapter-eyebrow {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .24em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 18px;
  display: flex; align-items: center; gap: 14px;
}
.chapter-eyebrow::after { content: ''; height: 1px; width: 64px; background: var(--border-accent); }

h1.display {
  font-family: var(--font-display); font-style: italic; font-weight: 700;
  font-size: clamp(4.2rem, 6vw, 7.5rem); letter-spacing: -0.025em; line-height: 0.98;
  margin-bottom: clamp(2rem, 4vh, 5rem);
}
h2.section-heading {
  font-family: var(--font-display); font-weight: 400;
  font-size: clamp(2.5rem, 3.6vw, 4rem); letter-spacing: -0.015em; line-height: 1.06;
  margin-bottom: clamp(2rem, 4vh, 5rem);
}
h3.subheading {
  font-family: var(--font-body); font-weight: 500;
  font-size: clamp(1.1rem, 1.5vw, 1.4rem); letter-spacing: .06em; text-transform: uppercase;
  margin-bottom: 1.2rem; color: var(--text-primary);
}
.body-copy { max-width: 65ch; }
.body-copy p { margin-bottom: 1.75rem; color: var(--text-primary); font-family: var(--font-serif); font-size: 1.06rem; line-height: 1.8; }
.body-copy p.lede { font-size: 1.2rem; color: var(--text-primary); }
.caption { font-size: 0.78rem; color: var(--text-secondary); }

.pull-quote {
  font-family: var(--font-display); font-style: italic; font-weight: 400;
  font-size: clamp(1.8rem, 2.8vw, 3rem); letter-spacing: .01em; line-height: 1.3;
  color: var(--text-primary);
  border-left: 1px solid var(--border-accent);
  padding-left: 36px; margin: 3.5rem 0;
  max-width: 28ch;
}
.pull-quote .pq-source { display: block; margin-top: 14px; font-family: var(--font-mono); font-style: normal; font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--text-muted); }

/* Two-column editorial grid */
.editorial-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 0 60px;
  max-width: 1280px; margin: 0 auto; padding: 0 60px;
}
.editorial-main { grid-column: 1; min-width: 0; }
.margin-col { grid-column: 2; }
.margin-col { display: flex; flex-direction: column; gap: 3.2rem; padding-top: 11rem; }
.margin-note {
  font-family: var(--font-mono); font-size: 0.75rem; line-height: 1.7;
  color: var(--text-muted);
  padding-top: 4px; padding-left: 16px;
  border-left: 1px solid var(--border-accent);
}
.marginalia {
  font-family: var(--font-hand); font-size: 1.18rem; line-height: 1.45;
  color: var(--accent);
  transform: rotate(-1.4deg);
  padding-left: 16px;
  opacity: .92;
}
.breakout { grid-column: 1 / -1; }

/* Equation blocks */
.eq-display {
  margin: 2.4rem 0; padding: 26px 30px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 3px;
  overflow-x: auto;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.eq-display .katex { font-size: 1.2em; color: var(--text-primary); }
.eq-display .eq-tag { font-family: var(--font-mono); font-size: 0.85rem; color: var(--text-muted); white-space: nowrap; }
.ktx-inline .katex { font-size: 1em; }
.ktx, .ktx-d { text-transform: none; letter-spacing: normal; }
.ktx .katex, .ktx-d .katex { text-transform: none; }
[data-theme="dark"] .katex { color: var(--text-primary); }

/* Citations */
sup.cite {
  font-family: var(--font-mono); font-size: 0.68em; color: var(--accent);
  cursor: help; position: relative; padding: 0 1px;
}
#cite-tooltip {
  position: fixed; z-index: 9200; max-width: 320px;
  background: var(--bg-secondary); border: 0.5px solid var(--border-accent); border-radius: 4px;
  padding: 12px 16px; pointer-events: none; opacity: 0;
  transform: translateY(4px);
  transition: opacity .18s ease, transform .18s ease;
  box-shadow: 0 12px 40px rgba(0,0,0,0.45);
}
#cite-tooltip.show { opacity: 1; transform: translateY(0); }
#cite-tooltip .ct-author { font-family: var(--font-display); font-style: italic; font-size: 1.05rem; color: var(--text-primary); }
#cite-tooltip .ct-title { font-family: var(--font-body); font-size: 0.82rem; color: var(--text-secondary); margin-top: 3px; line-height: 1.5; }
#cite-tooltip .ct-ref { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-muted); margin-top: 6px; }

/* Derivation accordions */
.derivation { margin: 2rem 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.derivation > summary {
  list-style: none; cursor: pointer; padding: 16px 4px;
  font-family: var(--font-body); font-weight: 500; font-size: 14px; color: var(--accent);
  display: flex; align-items: center; gap: 12px;
  transition: color .2s ease;
}
.derivation > summary::-webkit-details-marker { display: none; }
.derivation > summary:hover { text-decoration: underline; text-underline-offset: 4px; }
.derivation > summary .dv-icon {
  width: 18px; height: 18px; display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-size: 15px; color: var(--accent);
  transition: transform .2s cubic-bezier(0.33,1,0.68,1);
}
.derivation[open] > summary .dv-icon { transform: rotate(45deg); }
.derivation .dv-body { padding: 6px 4px 26px; }
.dv-step { display: grid; grid-template-columns: 34px 1fr; gap: 14px; margin-bottom: 18px; align-items: baseline; }
.dv-step .dv-num { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); padding-top: 4px; }
.dv-step .dv-content { min-width: 0; }
.dv-step .dv-content .dv-note { font-size: 0.85rem; color: var(--text-secondary); margin-top: 6px; }
.dv-step .katex-display { margin: .4em 0; }

/* ───────────────────────────────────────────────
   DASHBOARD — inputs | engine | results
   ─────────────────────────────────────────────── */
#sec-dashboard { padding-top: clamp(7rem, 12vh, 11rem); }
.dash-toolbar {
  max-width: 1700px; margin: 0 auto 18px; padding: 0 40px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.dash-toolbar .dt-left { display: flex; align-items: baseline; gap: 18px; }
.dash-toolbar .dt-title { font-family: var(--font-display); font-style: italic; font-weight: 600; font-size: 1.7rem; }
.dash-toolbar .dt-sub { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--text-muted); }
.dash-toolbar .dt-actions { display: flex; gap: 10px; }

.dashboard {
  display: grid;
  grid-template-columns: 340px 1fr 320px;
  gap: 20px;
  max-width: 1700px; margin: 0 auto; padding: 0 40px;
  align-items: start;
}
@media (max-width: 1450px) {
  .dashboard { grid-template-columns: 300px 1fr; }
  .dash-results { grid-column: 1 / -1; }
}

.panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 22px 22px 26px;
}
.panel-h {
  font-family: var(--font-body); font-weight: 500; font-size: 11px;
  letter-spacing: .14em; text-transform: uppercase; color: var(--text-secondary);
  padding-bottom: 12px; margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
}
.panel-h .live-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--status-ok);
  display: inline-block; animation: pulse-dot 2.4s ease infinite;
}
@keyframes pulse-dot { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

/* Inputs */
.col-left { position: sticky; top: 72px; max-height: calc(100vh - 92px); overflow-y: auto; }
.col-left::-webkit-scrollbar { width: 6px; }
.input-section-label {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--accent); margin: 20px 0 10px;
  display: flex; align-items: center; gap: 10px;
}
.input-section-label::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.field-row { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.field-row label { flex: 1 1 auto; font-size: 12.5px; color: var(--text-secondary); line-height: 1.35; }
.field-row input[type="number"] {
  width: 86px; padding: 6px 8px;
  background: var(--bg-tertiary); border: 1px solid var(--border); border-radius: 2px;
  color: var(--text-primary); font-family: var(--font-mono); font-size: 12.5px;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.field-row input[type="number"]:focus { outline: none; border-color: var(--border-accent); box-shadow: 0 0 0 2px var(--accent-glow); }
.field-row .unit { width: 52px; font-family: var(--font-mono); font-size: 10.5px; color: var(--text-muted); }
input[type="checkbox"] { accent-color: var(--accent); cursor: pointer; }

.tl-field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.tl-field > label { font-size: 11px; font-family: var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--text-secondary); }
.tl-select {
  width: 100%; padding: 8px 10px;
  background: var(--bg-tertiary); border: 1px solid var(--border-strong); border-radius: 2px;
  color: var(--text-primary); font-family: var(--font-body); font-size: 13.5px; cursor: pointer;
}
.tl-select:focus { outline: none; border-color: var(--border-accent); }
.tl-select option { background: var(--bg-secondary); }

.real-mode-toggle { display: flex; border: 1px solid var(--border-strong); border-radius: 2px; overflow: hidden; margin-bottom: 12px; }
.real-mode-toggle button {
  flex: 1; padding: 7px 6px; background: transparent; border: none; cursor: pointer;
  font-family: var(--font-body); font-size: 11px; letter-spacing: .04em; color: var(--text-secondary);
  transition: background .2s ease, color .2s ease;
}
.real-mode-toggle button.active { background: var(--accent-dim); color: var(--text-primary); }
.real-input-sub { display: none; }
.real-input-sub.visible { display: block; }
.computed-eta {
  margin-top: 10px; padding: 10px 12px; font-family: var(--font-mono); font-size: 11px;
  line-height: 1.9; color: var(--text-secondary);
  background: var(--accent-glow); border: 1px solid var(--border-accent); border-radius: 2px;
}
.computed-eta b { color: var(--accent); font-weight: 500; }

.ab-toggle-row { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; font-size: 13px; }
.ab-on-badge {
  font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .12em;
  color: var(--status-warn); border: 1px solid var(--status-warn); border-radius: 2px;
  padding: 1px 7px; margin-left: 6px;
  animation: pulse-dot 1.6s ease infinite;
}

.btn-row { display: flex; gap: 10px; margin-top: 18px; }
.btn-compute {
  flex: 1; padding: 11px 18px;
  background: var(--accent); color: #001122; border: none; border-radius: 2px;
  font-family: var(--font-body); font-weight: 500; font-size: 13px; letter-spacing: .08em; text-transform: uppercase;
  cursor: pointer; transition: transform .15s cubic-bezier(0.33,1,0.68,1), filter .2s ease;
}
.btn-compute:hover { filter: brightness(1.1); }
.btn-compute:active { transform: scale(0.985); }
.btn-reset {
  padding: 11px 16px; background: transparent;
  border: 1px solid var(--border-strong); border-radius: 2px;
  color: var(--text-secondary); font-family: var(--font-body); font-size: 12.5px; cursor: pointer;
  transition: color .2s ease, border-color .2s ease;
}
.btn-reset:hover { color: var(--text-primary); border-color: var(--border-accent); }

.status-line {
  margin-top: 14px; padding: 10px 12px; border-radius: 2px;
  font-family: var(--font-mono); font-size: 11px; line-height: 1.6;
  color: var(--text-muted); border: 1px dashed var(--border);
}
.status-line.ok  { color: var(--status-ok);  border-color: rgba(91,168,136,.4);  border-style: solid; }
.status-line.err { color: var(--status-err); border-color: rgba(192,80,80,.45); border-style: solid; }

/* Textbook presets */
.tb-presets { margin: 2px 0 14px; padding: 12px 12px; border: 1px solid var(--border-accent); background: var(--accent-glow); border-radius: 3px; }
.tb-presets > .tb-presets-summary { cursor: pointer; font-family: var(--font-mono); font-size: 10px; letter-spacing: .1em; color: var(--accent); text-transform: uppercase; list-style: none; outline: none; display: flex; align-items: center; gap: 6px; }
.tb-presets > .tb-presets-summary::-webkit-details-marker { display: none; }
.tb-presets > .tb-presets-summary::before { content: '▸'; font-size: 9px; transition: transform .15s ease; }
.tb-presets[open] > .tb-presets-summary::before { transform: rotate(90deg); }
.tb-presets[open] > .tb-presets-summary { margin-bottom: 9px; }
.tb-presets .tb-presets-h { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .1em; color: var(--accent); text-transform: uppercase; margin-bottom: 9px; line-height: 1.6; }
.tb-presets .tb-presets-row { display: flex; flex-wrap: wrap; gap: 6px; }
.tb-presets button {
  flex: 1 1 30%; padding: 7px 6px;
  font-family: var(--font-body); font-size: 11.5px; font-weight: 500; color: var(--text-primary);
  background: var(--bg-tertiary); border: 1px solid var(--border-strong); border-radius: 2px; cursor: pointer; line-height: 1.3;
  transition: background .2s ease, border-color .2s ease, color .2s ease;
}
.tb-presets button:hover { background: var(--accent); color: #001122; border-color: var(--accent); }
.tb-presets .tb-presets-expect { margin-top: 9px; font-family: var(--font-mono); font-size: 10.5px; color: var(--text-secondary); min-height: 15px; line-height: 1.6; }

/* ── Engine schematic card (center) ── */
.schem-card { padding-bottom: 14px; }
.schem-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.schem-svg-wrap { position: relative; margin-top: 4px; }
svg.engine { width: 100%; height: auto; display: block; }
.eng-zone-label { font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em; }
.eng-axis-label { font-family: var(--font-mono); font-size: 12px; fill: var(--text-secondary); }
.eng-hub { fill: #16314E; stroke: rgba(245,240,232,0.22); stroke-width: 0.8; }
[data-theme="light"] .eng-hub { fill: #C9CFDB; stroke: rgba(13,31,51,0.3); }
.gas-flow { filter: saturate(1.32) brightness(1.08); }
.eng-station-tick { stroke: rgba(245,240,232,0.22); stroke-width: 1; stroke-dasharray: 2 3; }
[data-theme="light"] .eng-station-tick { stroke: rgba(13,31,51,0.3); }
.eng-station-num circle { fill: var(--bg-tertiary); stroke: var(--border-accent); stroke-width: 1; transition: fill .2s ease, stroke .2s ease; }
.eng-station-num text { font-family: var(--font-mono); font-size: 12px; fill: var(--text-primary); }
.eng-station-num:hover circle { stroke: var(--accent); }
.eng-station-num.active circle { fill: var(--accent); stroke: var(--accent); }
.eng-station-num.active text { fill: #001122; font-weight: 600; }
.ab-glow { opacity: 0; transition: opacity .5s ease; }
.ab-on .ab-glow { opacity: 1; }
.comb-flame-inner { animation: flame-flicker 1.9s ease-in-out infinite; transform-origin: center; }
.ab-flame-inner, .ab-flame-outer { animation: flame-flicker 1.1s ease-in-out infinite; }
@keyframes flame-flicker { 0%,100% { opacity: .82; } 50% { opacity: .62; } }

.schem-probe {
  position: absolute; width: 200px; z-index: 60;
  background: var(--bg-secondary); border: 0.5px solid var(--border-accent); border-radius: 4px;
  padding: 10px 12px; pointer-events: none;
  opacity: 0; transform: translateY(6px);
  transition: opacity .2s ease, transform .2s ease;
  box-shadow: 0 14px 38px rgba(0,0,0,0.5);
}
.schem-probe.show { opacity: 1; transform: translateY(0); }
.schem-probe .pp-head { display: flex; align-items: center; gap: 7px; font-family: var(--font-body); font-weight: 500; font-size: 11px; color: var(--text-primary); margin-bottom: 8px; }
.schem-probe .pp-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.schem-probe .pp-grid { display: grid; grid-template-columns: auto 1fr; gap: 3px 12px; }
.schem-probe .pp-k { font-family: var(--font-mono); font-size: 10px; color: var(--text-muted); }
.schem-probe .pp-v { font-family: var(--font-mono); font-size: 11px; color: var(--text-primary); text-align: right; }

.station-strip { display: flex; align-items: center; flex-wrap: wrap; gap: 4px; margin-top: 10px; }
.station-strip .arr { color: var(--text-muted); font-size: 11px; }
.st-chip {
  display: flex; align-items: center; gap: 6px; padding: 4px 9px;
  background: var(--bg-tertiary); border: 1px solid var(--border); border-radius: 2px;
  cursor: pointer; transition: border-color .2s ease, background .2s ease;
}
.st-chip .b { font-family: var(--font-mono); font-size: 11px; color: var(--accent); }
.st-chip .n { font-family: var(--font-body); font-size: 10.5px; color: var(--text-secondary); }
.st-chip:hover { border-color: var(--border-accent); }
.st-chip.active { background: var(--accent-dim); border-color: var(--accent); }
.st-chip.active .n { color: var(--text-primary); }

/* ── Results column ── */
.result-bar {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px 12px;
  background: var(--bg-tertiary); border: 1px solid var(--border); border-radius: 3px;
  padding: 12px 14px; margin-bottom: 16px;
}
.result-bar .rb-head { grid-column: 1 / -1; font-family: var(--font-mono); font-size: 9px; letter-spacing: .16em; text-transform: uppercase; color: var(--text-muted); }
.result-bar .rb-field { display: flex; flex-direction: column; gap: 4px; }
.result-bar .rb-field label { font-size: 9.5px; font-family: var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); }
.result-bar .rb-field input {
  width: 100%; padding: 5px 7px; background: var(--bg-secondary);
  border: 1px solid var(--border-strong); border-radius: 2px;
  color: var(--text-primary); font-family: var(--font-mono); font-size: 12.5px;
}
.result-bar .rb-field input:focus { outline: none; border-color: var(--border-accent); box-shadow: 0 0 0 2px var(--accent-glow); }
.result-bar .rb-sep { grid-column: 1 / -1; height: 1px; background: var(--border); }
.result-bar .rb-out { display: flex; flex-direction: column; gap: 2px; }
.result-bar .rb-out .rb-k { font-size: 9px; font-family: var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); }
.result-bar .rb-out .rb-v { font-family: var(--font-mono); font-weight: 500; font-size: 15px; color: var(--accent); }
.result-bar .rb-out .rb-u { font-family: var(--font-mono); font-size: 8.5px; color: var(--text-muted); }

.primary-outputs { margin-bottom: 16px; }
.po-title { font-family: var(--font-mono); font-size: 10px; letter-spacing: .18em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; }
.po-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.po-item { background: var(--bg-tertiary); border: 1px solid var(--border-accent); border-radius: 3px; padding: 14px 14px 12px; }
.po-label { font-family: var(--font-body); font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--text-secondary); }
.po-value { font-family: var(--font-mono); font-size: 1.65rem; font-weight: 500; color: var(--text-primary); margin: 6px 0 2px; line-height: 1.1; transition: color .4s ease; }
.po-unit { font-family: var(--font-mono); font-size: 9.5px; color: var(--text-muted); }

#secondary-outputs { margin-bottom: 4px; }
.output-row {
  display: grid; grid-template-columns: 1fr auto auto auto; gap: 8px; align-items: baseline;
  padding: 6px 2px; border-bottom: 1px solid var(--border);
  font-size: 12px;
}
.output-row .o-label { color: var(--text-secondary); }
.output-row .o-eq { font-family: var(--font-mono); color: var(--text-muted); font-size: 11px; }
.output-row .o-val { font-family: var(--font-mono); font-size: 12.5px; color: var(--text-primary); min-width: 64px; text-align: right; }
.output-row .o-unit { font-family: var(--font-mono); font-size: 10px; color: var(--text-muted); min-width: 42px; }
/* A caveat attached to the row above it, not a row of its own — so it reads as
   an explanation of that number rather than another result. Only appears where
   a reported quantity needs one. */
.o-note {
  margin: -1px 0 6px; padding: 8px 10px;
  border-left: 2px solid var(--status-warn); border-radius: 0 6px 6px 0;
  background: color-mix(in srgb, var(--status-warn) 8%, transparent);
  font: 400 11.5px/1.55 var(--font-body); color: var(--text-secondary);
}
.o-note b { color: var(--text-primary); font-weight: 600; }
.o-note .o-note-val { font-family: var(--font-mono); color: var(--text-primary); }

.tb-note-wrap { margin: 14px 0; }
.tb-note-wrap details { border: 1px dashed var(--border-strong); border-radius: 3px; }
.tb-note-wrap summary { cursor: pointer; padding: 10px 12px; font-size: 12px; color: var(--accent); list-style: none; }
.tb-note-wrap summary::-webkit-details-marker { display: none; }
.tb-note-inner { padding: 4px 14px 14px; font-size: 12px; color: var(--text-secondary); }
.tb-note-inner ol { padding-left: 18px; margin: 8px 0; }
.tb-note-inner li { margin-bottom: 8px; }
.tb-note-inner strong { color: var(--text-primary); font-weight: 500; }
.tb-note-inner .tb-rule { margin-top: 6px; }

.sta-table-wrap { margin-top: 18px; }
.sta-table-wrap h3 { font-family: var(--font-mono); font-size: 10px; letter-spacing: .18em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; font-weight: 500; }
table.sta { width: 100%; border-collapse: collapse; }
table.sta th {
  font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .06em; text-transform: uppercase;
  color: var(--text-muted); text-align: right; padding: 6px 6px; border-bottom: 1px solid var(--border-strong);
  font-weight: 400;
}
table.sta th:first-child { text-align: left; }
table.sta td {
  font-family: var(--font-mono); font-size: 11.5px; color: var(--text-primary);
  text-align: right; padding: 6px 6px; border-bottom: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}
table.sta td:first-child { text-align: left; color: var(--text-secondary); font-size: 10.5px; }
table.sta tr.hot td:first-child { color: var(--status-warn); }
table.sta tbody tr { transition: background .2s ease; cursor: pointer; }
table.sta tbody tr:hover { background: var(--accent-glow); }
table.sta tbody tr.active-station { background: var(--accent-dim); }
table.sta tbody tr.active-station td { color: var(--text-primary); }

/* ── Chart cards ── */
.chart-card { margin-top: 20px; }
.chart-card-header { display: flex; align-items: baseline; justify-content: space-between; gap: 14px; margin-bottom: 8px; }
.chart-title { font-family: var(--font-body); font-weight: 500; font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--text-primary); }
.chart-subtitle { font-family: var(--font-mono); font-size: 10px; color: var(--text-muted); }
.chart-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.chart-toolbar .ct-hint { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--text-muted); }
.chart-toolbar .ct-cursor { font-family: var(--font-mono); font-size: 10.5px; color: var(--accent); }
.chart-body { min-height: 320px; }
svg.chart-svg { width: 100%; height: auto; display: block; }
.chart-legend { display: flex; gap: 20px; margin-top: 10px; flex-wrap: wrap; }
.legend-item { display: flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 10px; letter-spacing: .04em; }
.legend-swatch { width: 22px; height: 0; border-top: 2px solid currentColor; display: inline-block; }
.legend-swatch.dashed { border-top-style: dashed; }
.fig-caption { font-family: var(--font-body); font-size: 12px; color: var(--text-muted); margin-top: 12px; }

/* ── Sweep section ── */
.sweep-panel { margin-bottom: 28px; }
.sweep-controls { display: flex; flex-wrap: wrap; gap: 16px 20px; align-items: flex-end; }
.sweep-controls .sc-field { display: flex; flex-direction: column; gap: 6px; }
.sweep-controls .sc-field label { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--text-muted); }
.sweep-controls .sc-field input {
  width: 120px; padding: 8px 10px; background: var(--bg-tertiary);
  border: 1px solid var(--border-strong); border-radius: 2px;
  color: var(--text-primary); font-family: var(--font-mono); font-size: 13px;
}
.sweep-controls .sc-field input:focus { outline: none; border-color: var(--border-accent); box-shadow: 0 0 0 2px var(--accent-glow); }
.sweep-controls .sc-field .tl-select { width: 230px; }
.btn-sweep {
  padding: 10px 30px; background: var(--accent); color: #001122; border: none; border-radius: 2px;
  font-family: var(--font-body); font-weight: 500; font-size: 13px; letter-spacing: .08em; text-transform: uppercase;
  cursor: pointer; transition: transform .15s cubic-bezier(0.33,1,0.68,1), filter .2s ease;
}
.btn-sweep:hover { filter: brightness(1.1); }
.btn-sweep:active { transform: scale(0.985); }
.sweep-status { margin-top: 14px; font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); min-height: 16px; }
.sweep-status.err { color: var(--status-err); }
.sweep-status.ok { color: var(--status-ok); }
.sweep-charts { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 4px; }

/* ── References ── */
.ref-list { counter-reset: refc; max-width: 760px; }
.ref-item {
  counter-increment: refc;
  display: grid; grid-template-columns: 44px 1fr; gap: 16px;
  padding: 18px 0; border-bottom: 1px solid var(--border);
}
.ref-item::before {
  content: '[' counter(refc) ']';
  font-family: var(--font-mono); font-size: 11px; color: var(--accent); padding-top: 5px;
}
.ref-item .ref-author { font-family: var(--font-display); font-style: italic; font-size: 1.15rem; color: var(--text-primary); }
.ref-item .ref-title { font-family: var(--font-serif); font-size: 0.92rem; color: var(--text-secondary); margin-top: 2px; }
.ref-item .ref-meta { font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-muted); margin-top: 5px; }

/* ── Footer ── */
#site-footer {
  border-top: 1px solid var(--border);
  padding: 60px 60px 80px; margin-top: 60px;
  display: flex; justify-content: space-between; align-items: baseline; gap: 30px;
  max-width: 1280px; margin-left: auto; margin-right: auto;
}
#site-footer .f-brand { font-family: var(--font-display); font-style: italic; font-weight: 600; font-size: 1.4rem; }
#site-footer .f-meta { font-family: var(--font-mono); font-size: 10.5px; color: var(--text-muted); line-height: 2; text-align: right; }

/* ── Cite modal ── */
#cite-modal {
  position: fixed; inset: 0; z-index: 9300; display: none;
  background: var(--bg-overlay); backdrop-filter: blur(6px);
}
#cite-modal.open { display: flex; align-items: center; justify-content: center; }
#cite-modal .cm-card {
  width: min(620px, 86vw); background: var(--bg-secondary);
  border: 1px solid var(--border-accent); border-radius: 5px; padding: 36px 40px;
  box-shadow: 0 30px 80px rgba(0,0,0,0.6);
}
#cite-modal h3 { font-family: var(--font-display); font-style: italic; font-weight: 600; font-size: 1.8rem; margin-bottom: 16px; }
#cite-modal pre {
  font-family: var(--font-mono); font-size: 11.5px; line-height: 1.8; color: var(--text-secondary);
  background: var(--bg-primary); border: 1px solid var(--border); border-radius: 3px;
  padding: 16px 18px; white-space: pre-wrap; margin-bottom: 18px;
}
#cite-modal .cm-actions { display: flex; gap: 10px; justify-content: flex-end; }

/* ── Reveal animation primitives (GSAP drives these) ── */
.rv { opacity: 0; transform: translateY(40px); will-change: transform, opacity; }
.eq-display.rv-eq .katex .base { transition: none; }

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* ── Print: ThrustLab Analysis Report ── */
@media print {
  body { background: #fff !important; color: #0D1F33 !important; font-size: 11pt; }
  body::after, #gl-stage, #gl-vignette, #gl-dim, #topnav, #toc, #read-progress,
  #entry-root, #skip-intro, #beat-title, .dash-toolbar .dt-actions, .nav-btn,
  #sec-theory, #sec-cycle, #sec-stations, #sec-sweep, .btn-row, .marginalia,
  .pull-quote, #site-footer .f-brand, #cite-modal, .sta3d { display: none !important; }
  #app { opacity: 1 !important; }
  .panel, .eq-display { background: #fff !important; border-color: #ccc !important; }
  .po-value, .rb-v { color: #0D1F33 !important; }
  .section { padding: 1.2rem 0 !important; }
  #print-header { display: block !important; }
}
#print-header { display: none; font-family: var(--font-mono); font-size: 10pt; padding: 12pt 0; border-bottom: 1pt solid #000; margin-bottom: 12pt; }

/* ───────────────────────────────────────────────
   MOTION LAYER · ghost numerals · word scrub · video intro
   ─────────────────────────────────────────────── */
.ghost-num {
  position: absolute; top: 6%; right: 3%;
  font-family: var(--font-display); font-style: italic; font-weight: 700;
  font-size: clamp(11rem, 17vw, 22rem); line-height: 1;
  color: var(--accent); opacity: 0.045;
  pointer-events: none; user-select: none; z-index: 0;
  will-change: transform;
}
/* Prose readable by default — the scroll-driven word-dim is enhancement only,
   never a reason for text to be invisible if ScrollTrigger doesn't fire. */
.scrub-p .w { opacity: 1; will-change: opacity; }
[data-no-scrub] .w { opacity: 1; }

.hr-flight {
  position: relative; height: 1px; background: var(--border);
  max-width: 1280px; margin: 0 auto; overflow: visible;
}
.hr-flight .hr-jet {
  position: absolute; top: -7px; left: 0;
  width: 34px; height: 14px; color: var(--accent);
  will-change: transform;
}

#video-intro {
  position: fixed; inset: 0; z-index: 9600;
  background: #000; display: none;
}
#video-intro.playing { display: block; }
#video-intro video { width: 100%; height: 100%; object-fit: cover; display: block; }
#video-intro .vi-skip {
  position: absolute; right: 28px; bottom: 24px;
  background: rgba(0,0,0,0.45); border: 1px solid rgba(245,240,232,0.25);
  color: rgba(245,240,232,0.7);
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase;
  padding: 8px 16px; cursor: pointer; border-radius: 2px;
}
#video-intro .vi-skip:hover { color: #C8A96E; border-color: rgba(200,169,110,0.6); }
@media print { .ghost-num, #video-intro, .hr-flight { display: none !important; } }

/* ───────────────────────────────────────────── */

.assume-list { padding-left: 20px; font-family: var(--font-serif); font-size: 0.95rem; color: var(--text-secondary); }
.assume-list li { margin-bottom: 10px; line-height: 1.7; }
.worked-body .step-row { display: grid; grid-template-columns: 40px 1fr; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--border); }
.worked-body .step-row:last-child { border-bottom: none; }
.worked-body .step-num {
  font-family: var(--font-display); font-style: italic; font-weight: 600; font-size: 1.6rem;
  color: var(--accent); line-height: 1.1;
}
.worked-body .step-title { font-family: var(--font-body); font-weight: 500; font-size: 0.95rem; color: var(--text-primary); margin-bottom: 10px; }
.worked-body .step-eq-row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 18px; padding: 7px 0; }
.worked-body .eq-label { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: .04em; color: var(--text-muted); min-width: 170px; }
.worked-body .eq-math .katex { font-size: 1em; }
.worked-body .eq-result { font-family: var(--font-mono); font-size: 0.85rem; color: var(--accent); }
.worked-body .eq-result .katex { font-size: 1em; color: var(--accent); }

/* ───────────────────────────────────────────── */

/* station walk list (Section 3) */
.sta-walk { border-top: 1px solid var(--border); margin-top: 1rem; }
.sta-walk-row {
  display: grid; grid-template-columns: 56px 1fr; gap: 20px; align-items: baseline;
  padding: 20px 4px; border-bottom: 1px solid var(--border);
  font-family: var(--font-serif); font-size: 0.98rem; color: var(--text-secondary); line-height: 1.75;
}
.sta-walk-row strong { color: var(--text-primary); font-weight: 500; }
.sta-walk-row .sw-id {
  font-family: var(--font-display); font-style: italic; font-weight: 600; font-size: 2rem;
  color: var(--accent); line-height: 1;
}
.sta-walk-row.hot .sw-id { color: var(--status-warn); }
.sta-walk-row .katex { font-size: 0.95em; }

/* ───────────────────────────────────────────── */

  .tj-invalid { border:1.5px solid #e5484d !important; background:rgba(229,72,77,.06) !important; }
  .tj-pop {
    position:absolute; z-index:9999; max-width:300px;
    background:#e5484d; color:#fff; font:500 11.5px/1.4 system-ui,Arial,sans-serif;
    padding:6px 9px; border-radius:6px; box-shadow:0 4px 14px rgba(0,0,0,.25);
    pointer-events:none; transform:translateY(4px); opacity:0; transition:opacity .12s,transform .12s;
  }
  .tj-pop.show { opacity:1; transform:translateY(0); }
  .tj-pop::before { content:""; position:absolute; top:-5px; left:14px; border:5px solid transparent; border-top:0; border-bottom-color:#e5484d; }
  .tj-banner { margin:8px 0 0; padding:7px 10px; border-radius:6px; font:600 12px/1.3 system-ui,Arial;
    background:rgba(229,72,77,.12); color:#e5484d; border:1px solid rgba(229,72,77,.4); display:none; }
  .tj-banner.show { display:block; }

/* ───────────────────────────────────────────── */

  .status-line.warn { color:#d9a23a; border-color:rgba(217,162,58,.45); border-style:solid; }
  .tj-neg-toggle { display:flex; align-items:center; gap:7px; margin:8px 0 0; padding:7px 10px;
    border-radius:6px; font:600 11.5px/1.3 system-ui,Arial; color:var(--text-secondary,#9aa);
    background:rgba(217,162,58,.08); border:1px solid rgba(217,162,58,.30); cursor:pointer; }
  .tj-neg-toggle input { cursor:pointer; }
  .tj-modal-bg { position:fixed; inset:0; z-index:10000; background:rgba(4,10,18,.62);
    -webkit-backdrop-filter:blur(2px); backdrop-filter:blur(2px);
    display:flex; align-items:center; justify-content:center; opacity:0; transition:opacity .15s; }
  .tj-modal-bg.show { opacity:1; }
  .tj-modal { max-width:430px; width:90%; background:#0e1b2a; color:#e8eef5;
    border:1px solid rgba(217,162,58,.45); border-radius:12px; padding:20px 22px;
    box-shadow:0 20px 60px rgba(0,0,0,.5); font:400 13px/1.5 system-ui,Arial; transform:translateY(8px); transition:transform .15s; }
  .tj-modal-bg.show .tj-modal { transform:translateY(0); }
  .tj-modal h3 { margin:0 0 8px; font-size:15px; color:#d9a23a; }
  .tj-modal p { margin:0 0 14px; }
  .tj-modal .tj-detail { font:500 12px/1.45 ui-monospace,Menlo,Consolas,monospace; color:#9fb3c8;
    background:rgba(255,255,255,.04); border-radius:6px; padding:8px 10px; margin:0 0 14px; }
  .tj-modal .tj-row { display:flex; gap:10px; justify-content:flex-end; }
  .tj-modal button { font:600 12.5px system-ui,Arial; padding:8px 14px; border-radius:7px; cursor:pointer; border:1px solid transparent; }
  .tj-btn-ghost { background:transparent; color:#9fb3c8; border-color:rgba(255,255,255,.18) !important; }
  .tj-btn-go { background:#d9a23a; color:#0e1b2a; }
  .tj-modal label.tj-remember { display:flex; align-items:center; gap:7px; font-size:11.5px; color:#9fb3c8; margin:0 auto 0 0; }

/* ───────────────────────────────────────────── */

  .tj-toast { position:fixed; top:18px; left:50%; transform:translateX(-50%) translateY(-12px);
    z-index:10050; max-width:min(560px,92vw); display:flex; align-items:flex-start; gap:10px;
    background:#2a1416; color:#ffd9da; border:1px solid rgba(229,72,77,.55); border-radius:10px;
    padding:12px 14px; box-shadow:0 14px 40px rgba(0,0,0,.45);
    font:500 12.5px/1.45 system-ui,Arial,sans-serif; opacity:0; pointer-events:none; transition:opacity .18s,transform .18s; }
  .tj-toast.show { opacity:1; transform:translateX(-50%) translateY(0); pointer-events:auto; }
  .tj-toast .tj-toast-ic { flex:0 0 auto; font-size:15px; line-height:1.2; }
  .tj-toast .tj-toast-bd { flex:1 1 auto; }
  .tj-toast .tj-toast-bd b { color:#ff7b7e; display:block; margin-bottom:2px; font-size:12.5px; }
  .tj-toast .tj-toast-x { flex:0 0 auto; cursor:pointer; color:#ffb3b5; font-weight:700; padding:0 2px; }

/* ───────────────────────────────────────────── */

  .tut-backdrop { position:fixed; inset:0; z-index:10100; background:transparent; }
  .tut-spot { position:absolute; z-index:10101; border-radius:4px; pointer-events:none;
    box-shadow:0 0 0 9999px rgba(8,10,14,.66), 0 0 0 2px var(--accent) inset, 0 0 18px var(--accent-dim);
    transition:all .25s cubic-bezier(.4,0,.2,1); }
  .tut-card { position:fixed; z-index:10102; width:320px; max-width:92vw; background:var(--bg-secondary); color:var(--text-primary);
    border:1px solid var(--border-accent); border-radius:6px; padding:16px 18px 14px;
    box-shadow:0 22px 60px rgba(0,0,0,.5); font:400 13px/1.55 var(--font-body); transition:top .25s,left .25s; }
  .tut-card .tut-step { font:600 10px/1 var(--font-mono); letter-spacing:.16em; text-transform:uppercase; color:var(--accent); margin-bottom:6px; }
  .tut-card h4 { margin:0 0 6px; font-size:15px; font-weight:600; color:var(--text-primary); }
  .tut-card p { margin:0 0 14px; color:var(--text-secondary); }
  .tut-card .tut-row { display:flex; align-items:center; gap:8px; }
  .tut-card .tut-dots { flex:1 1 auto; display:flex; gap:5px; }
  .tut-card .tut-dot { width:6px; height:6px; border-radius:50%; background:var(--border-strong); }
  .tut-card .tut-dot.on { background:var(--accent); }
  .tut-card button { font:600 11px var(--font-mono); letter-spacing:.05em; text-transform:uppercase; padding:7px 13px; border-radius:3px; cursor:pointer; border:1px solid transparent; }
  .tut-skip { background:transparent; color:var(--text-muted); }
  .tut-back { background:transparent; color:var(--text-secondary); border-color:var(--border-strong) !important; }
  .tut-next { background:var(--accent); color:var(--bg-primary); }
  #btn-tutorial { background:var(--accent-dim); border-color:var(--border-accent) !important; color:var(--accent); }

/* ───────────────────────────────────────────── */

  @media (hover:hover) and (pointer:fine) {
    html.tl-cursor-on, html.tl-cursor-on a, html.tl-cursor-on button,
    html.tl-cursor-on summary, html.tl-cursor-on .st-chip, html.tl-cursor-on .nav-dot,
    html.tl-cursor-on label { cursor: none; }
    /* keep the native caret where typing / selecting happens */
    html.tl-cursor-on input, html.tl-cursor-on textarea, html.tl-cursor-on select { cursor: auto; }

    #tl-cursor {
      position: fixed; left: 0; top: 0; z-index: 9994; pointer-events: none;
      width: 30px; height: 30px; margin: -15px 0 0 -15px; border-radius: 50%;
      border: 1px solid var(--border-accent);
      transition: width .18s ease, height .18s ease, margin .18s ease,
                  background-color .18s ease, border-color .18s ease, opacity .25s ease;
      will-change: transform;
    }
    #tl-cursor::after {
      content: ''; position: absolute; left: 50%; top: 50%;
      width: 4px; height: 4px; margin: -2px 0 0 -2px; border-radius: 50%;
      background: var(--accent); transition: opacity .18s ease;
    }
    #tl-cursor.hot {
      width: 52px; height: 52px; margin: -26px 0 0 -26px;
      border-color: var(--accent); background: var(--accent-glow);
    }
    #tl-cursor.hot::after { opacity: 0; }
    #tl-cursor.down { width: 22px; height: 22px; margin: -11px 0 0 -11px; }
    #tl-cursor.hide { opacity: 0; }
  }

/* ─────────────────────────────────────────────────────────────────────────
   23-06 REVEAL GUARANTEE  (must be the LAST rule block in this file)
   Every section below the dashboard is revealed by the scroll/JS pipeline in
   block-10-app.js. If that pipeline aborts (a CDN library quirk, a GSAP/Three
   init error, etc.), the content used to stay invisible. These !important
   rules make all reveal-targeted content visible no matter what the JS does —
   the fade-in animations become optional polish instead of a gate on content.
   ───────────────────────────────────────────────────────────────────────── */
.rv { opacity: 1 !important; transform: none !important; }
.scrub-p .w { opacity: 1 !important; }
.ghost-num { opacity: 0.045; }   /* keep decorative numerals subtle, not forced */

/* ═══════════════ Sweep explainer (collapsible) ═══════════════ */
.sweep-explainer {
  margin-top: 22px; border: 1px solid var(--border);
  border-radius: 10px; background: var(--bg-secondary); overflow: hidden;
}
.sweep-explainer > summary {
  list-style: none; cursor: pointer; user-select: none;
  display: flex; align-items: center; gap: 10px;
  padding: 16px 20px; font: 600 15px/1.3 var(--font-display);
  color: var(--text-primary); transition: background .15s;
}
.sweep-explainer > summary::-webkit-details-marker { display: none; }
.sweep-explainer > summary:hover { background: var(--accent-glow); }
.sweep-explainer .se-chevron {
  color: var(--accent); font-size: 20px; line-height: 1;
  transition: transform .2s ease; transform: rotate(0deg);
}
.sweep-explainer[open] .se-chevron { transform: rotate(90deg); }
.sweep-explainer .se-body {
  padding: 4px 22px 22px; border-top: 1px solid var(--border);
}
.sweep-explainer .se-body p {
  margin: 14px 0 0; font: 400 14.5px/1.7 var(--font-serif);
  color: var(--text-secondary); max-width: 74ch;
}
.sweep-explainer .se-lim-h {
  margin-top: 20px !important; font-family: var(--font-display) !important;
  font-weight: 600 !important; color: var(--text-primary) !important;
}
.sweep-explainer .se-lim {
  margin: 10px 0 0; padding: 0; list-style: none; max-width: 74ch;
}
.sweep-explainer .se-lim li {
  position: relative; padding: 8px 0 8px 20px;
  font: 400 14px/1.6 var(--font-body); color: var(--text-secondary);
  border-top: 1px solid var(--border);
}
.sweep-explainer .se-lim li::before {
  content: "—"; position: absolute; left: 0; color: var(--accent);
}
.sweep-explainer .se-lim strong,
.sweep-explainer .se-body em { color: var(--text-primary); }
.sweep-explainer .se-body em { font-style: italic; }

/* ═══════════════ Sweep chart hover read-out ═══════════════ */
.sw-tip {
  position: fixed; z-index: 10001; display: none; pointer-events: none;
  max-width: 260px; padding: 8px 11px; border-radius: 8px;
  background: var(--bg-secondary); color: var(--text-primary);
  border: 1px solid var(--border-strong); box-shadow: 0 8px 26px rgba(0,0,0,.4);
  font: 400 12px/1.5 var(--font-mono, var(--font-body));
}
.sw-tip b { color: var(--accent); font-weight: 600; }
.sw-tip .sw-tip-note {
  display: block; margin-top: 6px; color: var(--text-secondary);
  font-family: var(--font-body); font-size: 11.5px; line-height: 1.5;
}

/* ═══════════════ Feedback form ═══════════════ */
.fb-panel { padding: 26px 26px 24px; max-width: 760px; }
.fb-field { margin-bottom: 20px; }
.fb-field > label,
.fb-fieldset > legend {
  display: block; margin-bottom: 8px; padding: 0;
  font: 600 13px/1.3 var(--font-display); color: var(--text-primary);
  letter-spacing: .01em;
}
.fb-field .req { color: var(--status-err); }
.fb-field .fb-opt { color: var(--text-muted); font-weight: 400; }
.fb-panel textarea,
.fb-panel input[type="text"] {
  width: 100%; box-sizing: border-box;
  background: var(--bg-primary); color: var(--text-primary);
  border: 1px solid var(--border-strong); border-radius: 8px;
  padding: 11px 13px; font: 400 14px/1.55 var(--font-body); resize: vertical;
  transition: border-color .15s, box-shadow .15s;
}
.fb-panel textarea:focus,
.fb-panel input[type="text"]:focus {
  outline: none; border-color: var(--border-accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.fb-panel input[type="file"] {
  width: 100%; color: var(--text-secondary); font: 400 13px var(--font-body);
}
.fb-panel input[type="file"]::file-selector-button {
  margin-right: 12px; padding: 8px 14px; cursor: pointer;
  background: var(--bg-tertiary); color: var(--text-primary);
  border: 1px solid var(--border-strong); border-radius: 7px;
  font: 500 13px var(--font-display); transition: background .15s;
}
.fb-panel input[type="file"]::file-selector-button:hover { background: var(--accent-dim); }
.fb-hint { margin-top: 8px; font: 400 12.5px/1.5 var(--font-body); color: var(--text-muted); }
.fb-filelist { margin-top: 10px; display: grid; gap: 5px; }
.fb-fileitem {
  font: 400 12.5px/1.4 var(--font-mono, var(--font-body)); color: var(--text-secondary);
  padding: 6px 10px; background: var(--bg-primary); border: 1px solid var(--border);
  border-radius: 6px;
}
.fb-fileitem.fb-video { color: var(--status-warn); }
.fb-fieldset { border: 0; margin: 0 0 20px; padding: 0; }
.fb-radio {
  display: inline-flex; align-items: center; gap: 8px; margin: 0 18px 6px 0;
  font: 400 14px var(--font-body); color: var(--text-secondary); cursor: pointer;
}
.fb-radio input { accent-color: var(--accent); }
.fb-other { margin-top: 10px; max-width: 360px; }
.fb-err { margin: 6px 0 14px; color: var(--status-err); font: 500 13px/1.4 var(--font-body); min-height: 1px; }
.fb-submit { margin-top: 4px; }

/* provider chooser */
.fb-chooser {
  position: fixed; inset: 0; z-index: 10000;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-overlay); backdrop-filter: blur(4px); padding: 20px;
}
.fb-chooser[hidden] { display: none; }
.fb-chooser-card {
  max-width: 460px; width: 100%; background: var(--bg-secondary);
  border: 1px solid var(--border-strong); border-radius: 14px;
  padding: 26px 26px 22px; box-shadow: 0 20px 60px rgba(0,0,0,.5);
}
.fb-chooser-h { font: 600 18px/1.2 var(--font-display); color: var(--text-primary); margin-bottom: 12px; }
.fb-chooser-card p { font: 400 14px/1.6 var(--font-body); color: var(--text-secondary); margin: 0 0 20px; }
.fb-chooser-card strong { color: var(--text-primary); }
.fb-provider-row { display: flex; gap: 10px; flex-wrap: wrap; }
.fb-prov {
  flex: 1 1 120px; padding: 12px 14px; cursor: pointer;
  background: var(--accent); color: #fff; border: 0; border-radius: 9px;
  font: 600 14px var(--font-display); transition: filter .15s, transform .05s;
}
.fb-prov:hover { filter: brightness(1.08); }
.fb-prov:active { transform: translateY(1px); }
.fb-attach-note {
  font: 400 14px/1.6 var(--font-body); color: var(--text-secondary);
  margin: 0 0 20px; padding: 14px 16px; border-radius: 10px;
  background: var(--accent-glow); border: 1px solid var(--border-accent);
}
.fb-attach-note strong { color: var(--text-primary); }
.fb-attach-list { margin: 12px 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.fb-attach-list li {
  padding: 8px 11px; border-radius: 7px;
  background: var(--bg-primary); border: 1px solid var(--border-accent);
  font: 400 12.5px/1.45 var(--font-mono, var(--font-body));
  overflow-wrap: anywhere;
}
.fb-attach-list .fb-attach-why {
  display: block; margin-top: 2px;
  font: 400 12px/1.4 var(--font-body); color: var(--text-muted);
}
.fb-open-btn { width: 100%; }
.fb-cancel {
  margin-top: 16px; width: 100%; padding: 10px; cursor: pointer;
  background: transparent; color: var(--text-muted);
  border: 1px solid var(--border); border-radius: 9px;
  font: 500 13px var(--font-display); transition: color .15s, border-color .15s;
}
.fb-cancel:hover { color: var(--text-primary); border-color: var(--border-strong); }