/* ==========================================================================
   CORRISDALE PROGRAMME STUDIO — Stylesheet
   Design intent: an engineering workstation. A navy module rail (brand),
   a drawing-style title block, and a P6 status bar frame each working
   surface. Colour is reserved for meaning: one hue per contractor, gold
   for interfaces & key dates, red only for the critical path.
   ========================================================================== */

/* ---------- Tokens: light (default) ---------- */
:root {
  --navy: #1B2A4A;
  --gold: #C9A84C;
  --gold-ink: #86691B;          /* gold that stays readable as text on light */
  --bg: #EDF0F5;                /* cool drafting paper */
  --surface: #FFFFFF;
  --surface-2: #F5F7FA;
  --surface-3: #E9EDF3;
  --line: #DCE1E9;
  --line-strong: #BCC5D3;
  --grid-line: #EEF1F5;
  --ink: #131E36;
  --ink-2: #45526E;
  --ink-3: #78849C;
  --civ: #1F9A8A;               /* Stonebridge — concrete teal */
  --mec: #3F6FD1;               /* Tidewell — pipe azure */
  --eic: #9557CE;               /* Voltara — signal violet */
  --int: #C9A84C;               /* Integrator — brand gold */
  --ext: #7C8597;               /* Third party — neutral slate */
  --crit: #D6373D;              /* Semantic: critical */
  --ok: #2E8B57;
  --warn: #C98A12;
  --sel: rgba(201, 168, 76, .16);
  --rail-bg: #1B2A4A;
  --rail-ink: #C6CFDF;
  --rail-ink-hi: #FFFFFF;
  --scene-bg: #E3E8F0;
  --scene-ground: #C7D3BE;
  --shadow: 0 1px 2px rgba(19, 30, 54, .06), 0 8px 24px -12px rgba(19, 30, 54, .18);
  --f-display: "Archivo", "Arial Narrow", "Helvetica Neue", system-ui, sans-serif;
  --f-body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --r: 6px;
  --lw: 624px;                  /* P6 table width */
}

/* ---------- Tokens: dark (system preference, unless explicitly light) ---------- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --gold-ink: #D9BC67;
    --bg: #0B1322;
    --surface: #111B30;
    --surface-2: #15213A;
    --surface-3: #1B2945;
    --line: #22314F;
    --line-strong: #32446A;
    --grid-line: #16223A;
    --ink: #E7ECF5;
    --ink-2: #A8B3C8;
    --ink-3: #737F98;
    --civ: #34BFAC;
    --mec: #6F97F0;
    --eic: #B88AEA;
    --ext: #8E97A9;
    --crit: #F0575C;
    --ok: #4CBF82;
    --warn: #E5A93A;
    --sel: rgba(201, 168, 76, .18);
    --rail-bg: #0A1120;
    --scene-bg: #0D172B;
    --scene-ground: #1F2D24;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px -12px rgba(0, 0, 0, .6);
  }
}
/* ---------- Tokens: dark (explicit toggle) ---------- */
:root[data-theme="dark"] {
  color-scheme: dark;
  --gold-ink: #D9BC67;
  --bg: #0B1322;
  --surface: #111B30;
  --surface-2: #15213A;
  --surface-3: #1B2945;
  --line: #22314F;
  --line-strong: #32446A;
  --grid-line: #16223A;
  --ink: #E7ECF5;
  --ink-2: #A8B3C8;
  --ink-3: #737F98;
  --civ: #34BFAC;
  --mec: #6F97F0;
  --eic: #B88AEA;
  --ext: #8E97A9;
  --crit: #F0575C;
  --ok: #4CBF82;
  --warn: #E5A93A;
  --sel: rgba(201, 168, 76, .18);
  --rail-bg: #0A1120;
  --scene-bg: #0D172B;
  --scene-ground: #1F2D24;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px -12px rgba(0, 0, 0, .6);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.5 var(--f-body);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
a { color: inherit; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
.mono { font-family: var(--f-mono); font-variant-numeric: tabular-nums; }
.muted { color: var(--ink-3); }
[hidden] { display: none !important; }
kbd {
  font: 500 10px/1 var(--f-mono);
  padding: 2px 4px; border-radius: 3px;
  border: 1px solid currentColor; opacity: .7;
}
.eyebrow {
  margin: 0;
  font: 500 11px/1.4 var(--f-mono);
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--gold-ink);
}

/* Party colour utilities, shared by HTML and SVG */
.p-CIV { --pc: var(--civ); } .p-MEC { --pc: var(--mec); } .p-EIC { --pc: var(--eic); }
.p-INT { --pc: var(--int); } .p-EXT { --pc: var(--ext); }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font: 600 10.5px/1 var(--f-mono); letter-spacing: .06em;
  padding: 4px 7px 4px 6px; border-radius: 3px;
  color: var(--pc, var(--ink-2));
  background: color-mix(in srgb, var(--pc, var(--ink-3)) 13%, transparent);
  white-space: nowrap;
}
.chip::before { content: ""; width: 7px; height: 7px; border-radius: 1px; background: var(--pc, var(--ink-3)); }
.chip.crit { --pc: var(--crit); }
.chip.plain::before { display: none; }
.tag {
  display: inline-block; font: 500 10.5px/1 var(--f-mono); letter-spacing: .08em; text-transform: uppercase;
  padding: 4px 6px; border: 1px solid var(--line-strong); border-radius: 3px; color: var(--ink-2);
}

/* ---------- App shell ---------- */
.app {
  display: grid;
  grid-template-columns: 208px minmax(0, 1fr);
  grid-template-rows: 60px minmax(0, 1fr) 30px;
  grid-template-areas: "top top" "rail main" "status status";
  height: 100%;
}
.topbar {
  grid-area: top;
  display: flex; align-items: center; gap: 24px;
  padding: 0 16px 0 0;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  min-width: 0;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  width: 208px; height: 100%; padding: 0 18px;
  background: var(--rail-bg); color: var(--rail-ink-hi);
  text-decoration: none; flex: none;
}
.brand-mark { width: 34px; height: 34px; flex: none; color: var(--rail-ink); }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-name { font: 800 15px/1 var(--f-display); font-stretch: 118%; letter-spacing: .05em; text-transform: uppercase; }
.brand-sub { font: 500 10px/1.6 var(--f-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--gold); }

.titleblock {
  display: flex; margin: 0; min-width: 0; flex: 1; height: 100%;
}
.titleblock > div {
  display: flex; flex-direction: column; justify-content: center;
  padding: 0 18px; border-left: 1px solid var(--line); min-width: 0;
}
.titleblock > div:last-child { border-right: 1px solid var(--line); }
.titleblock dt { font: 500 9.5px/1.3 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.titleblock dd { margin: 2px 0 0; font: 500 12.5px/1.3 var(--f-mono); color: var(--ink); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.titleblock dd.changed { color: var(--crit); }
.titleblock dd.better { color: var(--ok); }
.topbar-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.icon-btn {
  width: 34px; height: 34px; display: grid; place-items: center;
  border: 1px solid var(--line); border-radius: var(--r); background: var(--surface-2);
}
.icon-btn svg { width: 17px; height: 17px; }
.icon-btn:hover { border-color: var(--line-strong); }
.scenario-pill {
  display: flex; align-items: center; gap: 8px;
  height: 32px; padding: 0 6px 0 12px; border-radius: 16px;
  border: 1px solid color-mix(in srgb, var(--crit) 45%, transparent);
  background: color-mix(in srgb, var(--crit) 9%, var(--surface));
  font-size: 12.5px; font-weight: 500; max-width: 380px;
}
.scenario-pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--crit); flex: none; animation: pulse 1.6s ease-in-out infinite; }
.scenario-pill #scenario-pill-text { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.scenario-pill .x { font: 600 10.5px/1 var(--f-mono); text-transform: uppercase; letter-spacing: .08em; padding: 6px 8px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); }
@keyframes pulse { 50% { opacity: .35; } }

/* Module rail */
.rail {
  grid-area: rail;
  display: flex; flex-direction: column; gap: 2px;
  padding: 14px 10px;
  background: var(--rail-bg); color: var(--rail-ink);
  overflow-y: auto;
}
.rail-link {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: var(--r);
  text-decoration: none; font-weight: 500; font-size: 13.5px;
  position: relative;
}
.rail-link svg { width: 19px; height: 19px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.rail-link kbd { margin-left: auto; color: var(--gold); border-color: color-mix(in srgb, var(--gold) 50%, transparent); }
.rail-link:hover { background: rgba(255, 255, 255, .06); color: var(--rail-ink-hi); }
.rail-link.active { background: rgba(201, 168, 76, .14); color: var(--rail-ink-hi); }
.rail-link.active::before {
  content: ""; position: absolute; left: -10px; top: 9px; bottom: 9px; width: 3px; border-radius: 0 2px 2px 0; background: var(--gold);
}
.rail-legend { margin-top: auto; padding: 14px 8px 4px; border-top: 1px solid rgba(255, 255, 255, .08); }
.rail-label { margin: 0 0 8px; font: 500 10px/1 var(--f-mono); letter-spacing: .16em; text-transform: uppercase; color: rgba(198, 207, 223, .6); }
.rail-legend ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.rail-legend li { display: grid; grid-template-columns: 10px 1fr; gap: 9px; align-items: center; font-size: 12px; line-height: 1.25; }
.rail-legend li i { width: 10px; height: 10px; border-radius: 2px; background: var(--pc); }
.rail-legend li b { display: block; font: 600 10px/1.2 var(--f-mono); letter-spacing: .08em; color: var(--rail-ink-hi); }
.rail-legend li.iface i { transform: rotate(45deg) scale(.85); }

/* Main + views */
.main { grid-area: main; position: relative; min-width: 0; min-height: 0; overflow: hidden; }
.view { position: absolute; inset: 0; }
.view-scroll { overflow-y: auto; overflow-x: hidden; padding: 28px clamp(16px, 3vw, 40px) 0; }
.view-fixed { display: grid; min-height: 0; }

/* Status bar */
.statusbar {
  grid-area: status;
  display: flex; align-items: center; gap: 18px;
  padding: 0 14px;
  background: var(--surface); border-top: 1px solid var(--line);
  font-size: 11.5px; color: var(--ink-2); white-space: nowrap; overflow: hidden;
}
.sb-item { display: flex; align-items: center; gap: 6px; }
.sb-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); display: inline-block; }
.statusbar.is-scenario .sb-dot { background: var(--crit); }
.sb-brand { margin-left: auto; color: var(--ink-3); overflow: hidden; text-overflow: ellipsis; }
.sb-brand a { color: var(--gold-ink); text-decoration: none; }
.sb-brand a:hover { text-decoration: underline; }

/* ---------- Shared type & buttons ---------- */
.display {
  margin: 14px 0 18px;
  font: 800 clamp(2rem, 3.05vw, 3.05rem)/1.02 var(--f-display);
  font-stretch: 106%;
  letter-spacing: -.012em;
  text-wrap: balance;
}
.display-accent { color: var(--gold-ink); }
.h1 { margin: 10px 0 12px; font: 750 clamp(1.7rem, 2.6vw, 2.35rem)/1.08 var(--f-display); font-stretch: 108%; text-wrap: balance; }
h2 { margin: 8px 0 6px; font: 700 1.45rem/1.15 var(--f-display); font-stretch: 105%; text-wrap: balance; }
.lede { margin: 0; max-width: 64ch; font-size: 15.5px; line-height: 1.6; color: var(--ink-2); }
.lede em { color: var(--ink); font-style: normal; font-weight: 600; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 42px; padding: 0 18px; border-radius: var(--r);
  font-weight: 600; font-size: 14px; text-decoration: none; border: 1px solid transparent;
  transition: transform .15s ease, background .15s ease, border-color .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--navy); color: #fff; border-color: var(--navy); }
:root[data-theme="dark"] .btn-primary { background: var(--gold); color: #1B2A4A; border-color: var(--gold); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn-primary { background: var(--gold); color: #1B2A4A; border-color: var(--gold); } }
.btn-ghost { border-color: var(--line-strong); background: var(--surface); }
.btn-ghost:hover { border-color: var(--ink-3); }
.btn-sm { height: 34px; padding: 0 12px; font-size: 13px; }

.page-head { max-width: 1180px; margin-bottom: 26px; }
.page-foot {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 32px;
  margin-top: 48px; padding: 22px 0 30px; border-top: 1px solid var(--line);
  font-size: 13px; color: var(--ink-2);
}
.page-foot p { margin: 0; }
.page-foot a { color: var(--gold-ink); font-weight: 600; text-decoration: none; }
.page-foot a:hover { text-decoration: underline; }
.chart-card { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 18px; min-width: 0; }
.card-h { margin: 0 0 14px; font: 650 15px/1.3 var(--f-body); display: flex; flex-wrap: wrap; gap: 8px; align-items: baseline; }
.card-h .muted { font: 400 11px/1 var(--f-mono); letter-spacing: .06em; }

/* ---------- Overview ---------- */
.ov-hero {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(20px, 3vw, 44px);
  align-items: start; max-width: 1480px;
}
.ov-copy { padding-top: 6px; }
.ov-cta { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0 28px; }
.ov-facts {
  display: grid; grid-template-columns: max-content 1fr; gap: 0; margin: 0;
  border-top: 1px solid var(--line); font-size: 13px;
}
.ov-facts dt, .ov-facts dd { padding: 8px 0; border-bottom: 1px solid var(--line); margin: 0; }
.ov-facts dt { font: 500 10.5px/1.9 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); padding-right: 22px; }
.ov-facts dd { color: var(--ink); }
.ov-stage { margin: 0; }
.stage-frame {
  position: relative; overflow: hidden; border-radius: 8px;
  background: var(--scene-bg);
  border: 1px solid var(--line);
  aspect-ratio: 16 / 10.5; min-height: 320px; max-width: 100%;
  touch-action: none;
}
.stage-frame canvas { position: absolute; inset: 0; display: block; width: 100% !important; height: 100% !important; cursor: grab; }
.stage-frame canvas:active { cursor: grabbing; }
.stage-frame-full { position: absolute; inset: 0; aspect-ratio: auto; min-height: 0; height: auto; border-radius: 0; border: 0; }
.stage-caption { display: flex; justify-content: space-between; gap: 16px; margin-top: 10px; font-size: 12px; color: var(--ink-3); }
.stage-caption .mono { color: var(--ink-2); white-space: nowrap; }
.stage-fallback { position: absolute; inset: 0; display: grid; place-items: center; padding: 24px; text-align: center; color: var(--ink-2); }

/* Scene callout labels (HTML over WebGL) */
.scene-labels { position: absolute; inset: 0; pointer-events: none; }
.scene-label {
  position: absolute; left: 0; top: 0;
  transform: translate(-50%, -100%);
  display: flex; flex-direction: column; align-items: center;
  font: 600 10.5px/1.2 var(--f-mono); letter-spacing: .06em; text-transform: uppercase;
  color: var(--ink); white-space: nowrap;
  transition: opacity .2s;
}
.scene-label span {
  padding: 4px 7px 4px 6px; border-radius: 3px;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  border: 1px solid color-mix(in srgb, var(--pc) 55%, transparent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, .12);
  display: flex; gap: 6px; align-items: center;
}
.scene-label span::before { content: ""; width: 6px; height: 6px; border-radius: 1px; background: var(--pc); }
.scene-label::after { content: ""; width: 1px; height: 22px; background: color-mix(in srgb, var(--pc) 70%, transparent); }

.kpis {
  display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 0;
  margin: 34px 0 10px; max-width: 1480px;
  border-top: 2px solid var(--ink); border-bottom: 1px solid var(--line);
}
.kpi { padding: 14px 16px 16px; border-right: 1px solid var(--line); min-width: 0; }
.kpi:first-child { padding-left: 0; }
.kpi:last-child { border-right: 0; }
.kpi-label { margin: 0; font: 500 10px/1.3 var(--f-mono); letter-spacing: .13em; text-transform: uppercase; color: var(--ink-3); }
.kpi-value { margin: 6px 0 2px; white-space: nowrap; font: 750 clamp(22px, 2.1vw, 30px)/1 var(--f-display); font-stretch: 110%; font-variant-numeric: tabular-nums; }
.kpi-value small { font: 500 12px var(--f-mono); color: var(--ink-3); margin-left: 4px; }
.kpi-note { margin: 0; font-size: 12px; color: var(--ink-2); }
.kpi.crit .kpi-value { color: var(--crit); }

.ov-section { max-width: 1480px; margin-top: 46px; }
.sec-head { margin-bottom: 16px; }
.sec-sub { margin: 4px 0 0; max-width: 72ch; color: var(--ink-2); }

/* Critical path "baton" ribbon */
.baton-wrap { overflow-x: auto; padding-bottom: 8px; }
.baton { display: flex; align-items: stretch; gap: 0; min-width: max-content; }
.baton-seg { display: flex; flex-direction: column; gap: 8px; padding: 12px 14px; background: color-mix(in srgb, var(--pc) 9%, var(--surface)); border-top: 3px solid var(--pc); }
.baton-seg:first-child { border-radius: 6px 0 0 6px; }
.baton-seg:last-child { border-radius: 0 6px 6px 0; }
.baton-who { font: 700 11px/1 var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--pc); display: flex; gap: 8px; }
.baton-who span { color: var(--ink-3); font-weight: 500; letter-spacing: .04em; text-transform: none; }
.baton-acts { display: flex; gap: 6px; }
.baton-act {
  display: flex; flex-direction: column; gap: 3px; width: 128px; padding: 8px 9px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 4px; text-align: left;
  transition: border-color .15s, transform .15s;
}
.baton-act:hover { border-color: var(--pc); transform: translateY(-2px); }
.baton-act b { font: 600 10.5px/1 var(--f-mono); color: var(--pc); }
.baton-act span { font-size: 12px; line-height: 1.3; color: var(--ink); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.baton-act i { font: 400 10.5px/1 var(--f-mono); font-style: normal; color: var(--ink-3); margin-top: auto; }
.baton-hand { display: grid; place-items: center; width: 34px; position: relative; background: var(--surface-2); }
.baton-hand svg { width: 16px; height: 16px; }

/* Party cards */
.party-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.party {
  background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 20px;
  display: flex; flex-direction: column; gap: 14px;
}
.party-code { font: 800 44px/0.9 var(--f-display); font-stretch: 125%; color: var(--pc); letter-spacing: .02em; margin: 0; }
.party-name { margin: 0; font-weight: 650; font-size: 15px; }
.party-pkg { margin: 2px 0 0; color: var(--ink-3); font-size: 12.5px; }
.party ul { margin: 0; padding: 0 0 0 16px; color: var(--ink-2); font-size: 13px; display: grid; gap: 3px; }
.party ul li::marker { color: var(--pc); }
.party-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--line); margin-top: auto; }
.party-stats div { padding: 9px 0; border-bottom: 1px solid var(--line); }
.party-stats div:nth-child(odd) { padding-right: 10px; border-right: 1px solid var(--line); }
.party-stats div:nth-child(even) { padding-left: 12px; }
.party-stats dt { font: 500 9.5px/1.3 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.party-stats dd { margin: 3px 0 0; font: 500 13px/1.2 var(--f-mono); font-variant-numeric: tabular-nums; }
.party-stats dd.crit { color: var(--crit); }

/* S-curve */
#scurve svg { display: block; width: 100%; height: auto; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 10px; font-size: 12.5px; color: var(--ink-2); }
.chart-legend span { display: inline-flex; align-items: center; gap: 7px; }
.chart-legend i { width: 16px; height: 3px; border-radius: 2px; background: var(--pc); }
.ax { font: 400 10.5px var(--f-mono); fill: var(--ink-3); }
.ax-line { stroke: var(--line); stroke-width: 1; }
.ax-grid { stroke: var(--grid-line); stroke-width: 1; }

/* ---------- Programme (P6 style) ---------- */
#view-programme { grid-template-rows: auto minmax(0, 1fr) auto; background: var(--surface); }
.pg-toolbar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px;
  padding: 9px 14px; border-bottom: 1px solid var(--line); background: var(--surface-2);
}
.seg { display: inline-flex; border: 1px solid var(--line-strong); border-radius: var(--r); overflow: hidden; background: var(--surface); }
.seg button {
  border: 0; background: none; padding: 6px 10px; font-size: 12.5px; font-weight: 500; color: var(--ink-2);
  border-right: 1px solid var(--line); display: inline-flex; align-items: center; gap: 6px;
}
.seg button:last-child { border-right: 0; }
.seg button i { width: 8px; height: 8px; border-radius: 2px; background: var(--pc); }
.seg button.on { background: var(--navy); color: #fff; }
.seg button.on i { outline: 1px solid rgba(255, 255, 255, .6); }
.seg-sm button { padding: 5px 9px; font-size: 12px; }
.search { display: flex; align-items: center; gap: 6px; height: 30px; padding: 0 9px; border: 1px solid var(--line-strong); border-radius: var(--r); background: var(--surface); }
.search svg { width: 14px; height: 14px; fill: none; stroke: var(--ink-3); stroke-width: 2; }
.search input { border: 0; outline: 0; background: none; width: 120px; font-size: 13px; }
.tb-group { display: inline-flex; align-items: center; gap: 8px; }
.tb-select { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-3); }
.tb-select select { height: 30px; border: 1px solid var(--line-strong); border-radius: var(--r); background: var(--surface); padding: 0 6px; font-size: 12.5px; color: var(--ink); }
.chk { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--ink-2); cursor: pointer; white-space: nowrap; }
.chk input { accent-color: var(--navy); margin: 0; }
.tb-btn {
  height: 30px; min-width: 30px; padding: 0 10px; border-radius: var(--r);
  border: 1px solid var(--line-strong); background: var(--surface); font-size: 12.5px; font-weight: 500;
  display: inline-flex; align-items: center; gap: 6px; justify-content: center;
}
.tb-btn:hover:not(:disabled) { border-color: var(--ink-3); }
.tb-btn:disabled { opacity: .45; cursor: not-allowed; }
.tb-btn.on { background: var(--sel); border-color: var(--gold); }
.tb-primary { background: var(--navy); color: #fff; border-color: var(--navy); }
.tb-primary kbd { opacity: .8; }
.tb-primary.pending { background: var(--crit); border-color: var(--crit); animation: pulse 1.4s ease-in-out infinite; }

.pg-scroll { overflow: auto; position: relative; min-height: 0; outline: none; }
.pg-inner { position: relative; }
.pg-head { position: sticky; top: 0; z-index: 6; display: flex; height: 46px; background: var(--surface-2); border-bottom: 1px solid var(--line-strong); }
.pg-head-left {
  position: sticky; left: 0; z-index: 7; flex: none; width: var(--lw);
  display: flex; align-items: flex-end; background: var(--surface-2); border-right: 1px solid var(--line-strong);
  font: 600 10.5px/1.25 var(--f-body); color: var(--ink-2); text-transform: uppercase; letter-spacing: .04em;
}
.pg-head-left > div { padding: 0 8px 7px; }
.pg-head-right svg { display: block; }
.pg-body { display: flex; }
.pg-left { position: sticky; left: 0; z-index: 3; flex: none; width: var(--lw); background: var(--surface); border-right: 1px solid var(--line-strong); }
.pg-row {
  display: flex; align-items: center; height: 26px;
  border-bottom: 1px solid var(--grid-line); font-size: 12.5px; cursor: pointer;
  white-space: nowrap;
}
.pg-row:hover { background: var(--surface-2); }
.pg-row.sel { background: var(--sel); box-shadow: inset 3px 0 0 var(--gold); }
.pg-row.traced { box-shadow: inset 3px 0 0 var(--gold); }
.pg-row.dim { opacity: .38; }
.pg-row > div { padding: 0 8px; overflow: hidden; text-overflow: ellipsis; }
.c-id { width: 94px; flex: none; font-family: var(--f-mono); font-size: 11.5px; color: var(--ink-2); }
.c-name { flex: 1; min-width: 0; display: flex; align-items: center; gap: 6px; }
.c-name .nm { overflow: hidden; text-overflow: ellipsis; }
.c-dur { width: 50px; flex: none; text-align: right; font-family: var(--f-mono); font-size: 11.5px; }
.c-date { width: 84px; flex: none; font-family: var(--f-mono); font-size: 11.5px; }
.c-tf { width: 54px; flex: none; text-align: right; font-family: var(--f-mono); font-size: 11.5px; }
.c-tf.crit, .c-name.crit .nm { color: var(--crit); }
.c-tf.crit { font-weight: 600; }
.c-date.moved { color: var(--crit); font-weight: 600; }
.c-date.earlier { color: var(--ok); font-weight: 600; }
.c-dur.edited { color: var(--gold-ink); font-weight: 600; }
.ms-icon { width: 9px; height: 9px; flex: none; transform: rotate(45deg); background: var(--pc); border-radius: 1px; }
.pg-row.wbs {
  font-weight: 650; cursor: pointer;
  background: color-mix(in srgb, var(--pc) 12%, var(--surface));
  border-bottom-color: color-mix(in srgb, var(--pc) 22%, var(--surface));
}
.pg-row.wbs.l2 { background: color-mix(in srgb, var(--pc) 6%, var(--surface)); font-weight: 600; }
.pg-row.wbs .c-id { color: var(--pc); font-weight: 600; font-size: 11px; }
.pg-row.wbs:hover { filter: brightness(.98); }
.twisty { width: 12px; height: 12px; flex: none; transition: transform .15s; fill: none; stroke: currentColor; stroke-width: 2; }
.collapsed .twisty { transform: rotate(-90deg); }
.pg-empty { padding: 40px; color: var(--ink-3); text-align: center; }

/* Gantt SVG classes */
.g-row-alt { fill: var(--surface-2); opacity: .55; }
.g-row-wbs { fill: var(--pc); opacity: .07; }
.g-row-sel { fill: var(--gold); opacity: .13; }
.g-month { stroke: var(--line); stroke-width: 1; }
.g-week { stroke: var(--grid-line); stroke-width: 1; }
.g-bar { fill: var(--pc); }
.g-bar.crit-outline { stroke: var(--crit); stroke-width: 1.6; }
.g-bar.cm-crit { fill: var(--crit); }
.g-bar.cm-norm { fill: #5B7FC4; }
.g-bar.dim { opacity: .25; }
.g-base { fill: var(--ink-3); opacity: .5; }
.g-float { stroke: var(--ink-3); stroke-width: 1.4; }
.g-ms { fill: var(--pc); stroke: var(--surface); stroke-width: 1; }
.g-ms.iface { fill: var(--gold); stroke: var(--navy); stroke-width: 1; }
.g-ms.crit-outline { stroke: var(--crit); stroke-width: 1.8; }
.g-sum { fill: var(--pc); }
.g-label { font: 500 10.5px var(--f-body); fill: var(--ink-2); }
.g-label.crit { fill: var(--crit); }
.g-rel { fill: none; stroke: var(--ink-3); stroke-width: 1; opacity: .75; }
.g-rel.nd { stroke-dasharray: 3 3; opacity: .5; }
.g-rel.crit { stroke: var(--crit); opacity: .85; }
.g-rel.hi { stroke: var(--gold); stroke-width: 2; opacity: 1; }
.g-rel.lo { opacity: .12; }
.g-status { stroke: var(--gold); stroke-width: 1.5; stroke-dasharray: 5 3; }
.g-status-lbl { font: 600 10px var(--f-mono); fill: var(--gold-ink); }
.g-finish { stroke: var(--crit); stroke-width: 1; stroke-dasharray: 2 3; opacity: .7; }
.ts-month { font: 600 11px var(--f-body); fill: var(--ink); }
.ts-week { font: 400 9.5px var(--f-mono); fill: var(--ink-3); }
.ts-sep { stroke: var(--line-strong); }
.ts-tick { stroke: var(--line); }

/* Details pane (P6 bottom layout) */
.pg-details { border-top: 2px solid var(--line-strong); background: var(--surface-2); height: 250px; display: grid; grid-template-rows: auto auto minmax(0, 1fr); min-height: 0; }
.dt-head { display: flex; align-items: center; gap: 12px; padding: 10px 16px 0; min-width: 0; flex-wrap: wrap; }
.dt-id { font: 600 12px/1 var(--f-mono); color: var(--pc); }
.dt-name { font: 650 15px/1.2 var(--f-body); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.dt-head .chips { display: flex; gap: 6px; margin-left: auto; }
.dt-tabs { display: flex; gap: 2px; padding: 8px 16px 0; border-bottom: 1px solid var(--line); }
.dt-tabs button {
  border: 1px solid transparent; border-bottom: 0; background: none; padding: 6px 12px; font-size: 12.5px; font-weight: 500; color: var(--ink-2);
  border-radius: 5px 5px 0 0; margin-bottom: -1px;
}
.dt-tabs button.on { background: var(--surface); border-color: var(--line); color: var(--ink); }
.dt-body { overflow: auto; padding: 14px 16px; background: var(--surface); }
.dt-empty { display: grid; place-items: center; height: 100%; color: var(--ink-3); text-align: center; padding: 20px; }
.dt-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px 24px; }
.dt-field dt { font: 500 9.5px/1.3 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.dt-field dd { margin: 3px 0 0; font: 500 13px/1.3 var(--f-mono); font-variant-numeric: tabular-nums; }
.dt-field dd.crit { color: var(--crit); }
.dt-field input { width: 76px; height: 28px; padding: 0 8px; border: 1px solid var(--line-strong); border-radius: 4px; background: var(--surface); font: 500 13px var(--f-mono); }
.dt-field .hint { font: 400 11px var(--f-body); color: var(--ink-3); margin-left: 6px; }
.rel-cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.rel-table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.rel-table caption { text-align: left; font: 600 11px/1 var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); padding-bottom: 8px; }
.rel-table th { text-align: left; font: 500 10px var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); padding: 4px 6px; border-bottom: 1px solid var(--line); }
.rel-table td { padding: 5px 6px; border-bottom: 1px solid var(--grid-line); white-space: nowrap; }
.rel-table td.nm { white-space: normal; }
.rel-table tr { cursor: pointer; }
.rel-table tr:hover td { background: var(--surface-2); }
.rel-table .drv { font: 600 10px var(--f-mono); color: var(--crit); letter-spacing: .06em; }
.note { max-width: 78ch; margin: 0; font-size: 14px; line-height: 1.6; color: var(--ink-2); }
.note strong { color: var(--ink); }
.iface-box { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; font-size: 13px; max-width: 900px; }
.iface-box dt { font: 500 10px/1.8 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.iface-box dd { margin: 0; }
.handshake { display: flex; align-items: center; gap: 10px; }
.handshake svg { width: 40px; height: 12px; }

/* ---------- 4D Build ---------- */
#view-build { background: var(--scene-bg); }
.fd {
  display: grid; height: 100%;
  grid-template-columns: minmax(0, 1fr) 300px;
  grid-template-rows: minmax(0, 1fr) auto;
  grid-template-areas: "stage side" "time time";
}
.fd-stage { grid-area: stage; position: relative; min-height: 0; }
.fd-hud { position: absolute; inset: 14px 14px auto 14px; display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; pointer-events: none; }
.fd-hud > * { pointer-events: auto; }
.fd-status, .fd-controls {
  background: color-mix(in srgb, var(--surface) 90%, transparent);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; box-shadow: var(--shadow);
}
.fd-date { margin: 4px 0 0; font: 750 26px/1 var(--f-display); font-stretch: 110%; font-variant-numeric: tabular-nums; }
.fd-week { margin: 4px 0 10px; font-size: 11.5px; color: var(--ink-3); }
.fd-overall { font-size: 12px; color: var(--ink-2); min-width: 200px; }
.fd-overall span { font: 600 13px var(--f-mono); color: var(--ink); }
.bar { height: 5px; border-radius: 3px; background: var(--surface-3); margin-top: 6px; overflow: hidden; }
.bar i { display: block; height: 100%; width: 0; background: var(--pc, var(--gold)); border-radius: 3px; transition: width .2s linear; }
.fd-controls { display: grid; gap: 10px; justify-items: end; }
.fd-toggles { display: flex; flex-wrap: wrap; gap: 6px 14px; justify-content: flex-end; }
.fd-cams { position: absolute; left: 14px; bottom: 14px; display: flex; gap: 6px; flex-wrap: wrap; }
.fd-cams button {
  border: 1px solid var(--line); background: color-mix(in srgb, var(--surface) 90%, transparent); backdrop-filter: blur(6px);
  padding: 6px 10px; border-radius: 5px; font-size: 12px; font-weight: 500; color: var(--ink-2);
}
.fd-cams button:hover { color: var(--ink); border-color: var(--line-strong); }
.fd-side { grid-area: side; background: var(--surface); border-left: 1px solid var(--line); overflow-y: auto; padding: 16px; display: grid; gap: 22px; align-content: start; }
.side-h { margin: 0 0 10px; font: 600 10.5px/1 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); display: flex; align-items: center; gap: 8px; }
.side-h .count { font: 600 11px/1 var(--f-mono); color: var(--ink); background: var(--surface-3); padding: 3px 6px; border-radius: 3px; letter-spacing: 0; }
.live-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.live-list li { display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; padding: 8px 10px; border-radius: 5px; background: var(--surface-2); border-left: 3px solid var(--pc); cursor: pointer; }
.live-list li:hover { background: var(--surface-3); }
.live-list .l-id { font: 600 10.5px var(--f-mono); color: var(--pc); }
.live-list .l-pct { font: 500 11px var(--f-mono); color: var(--ink-2); text-align: right; }
.live-list .l-name { grid-column: 1 / -1; font-size: 12.5px; line-height: 1.3; }
.live-list .l-bar { grid-column: 1 / -1; }
.live-list .empty { border-left-color: var(--line); color: var(--ink-3); cursor: default; font-size: 12.5px; }
.prog-row { display: grid; grid-template-columns: 1fr auto; font-size: 12.5px; margin-bottom: 10px; }
.prog-row b { font: 500 11.5px var(--f-mono); }
.prog-row .bar { grid-column: 1 / -1; }
.fd-timeline {
  grid-area: time; display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; background: var(--surface); border-top: 1px solid var(--line);
}
.fd-timeline select { height: 32px; border: 1px solid var(--line-strong); border-radius: var(--r); background: var(--surface); padding: 0 6px; font: 500 12px var(--f-mono); }
.play { width: 40px; height: 40px; border-radius: 50%; border: 0; background: var(--navy); color: #fff; display: grid; place-items: center; flex: none; }
.play svg { width: 16px; height: 16px; fill: currentColor; }
.play .i-pause { display: none; }
.play.playing .i-play { display: none; }
.play.playing .i-pause { display: block; }
.track { position: relative; flex: 1; height: 74px; cursor: pointer; touch-action: none; min-width: 0; }
.track svg { display: block; width: 100%; height: 100%; overflow: visible; }
.tr-lane { fill: var(--surface-2); }
.tr-bar { fill: var(--pc); opacity: .85; }
.tr-lbl { font: 600 9.5px var(--f-mono); fill: var(--ink-3); letter-spacing: .06em; }
.tr-month { font: 400 9.5px var(--f-mono); fill: var(--ink-3); }
.tr-tick { stroke: var(--line); }
.tr-if { fill: var(--gold); stroke: var(--navy); stroke-width: .8; }
.tr-head { stroke: var(--gold); stroke-width: 2; }
.tr-knob { fill: var(--gold); stroke: var(--surface); stroke-width: 2; }
.tr-done { fill: var(--ink); opacity: .06; }

/* ---------- Interfaces ---------- */
.swim-card { max-width: 1480px; padding: 0; }
.swim-scroll { overflow-x: auto; }
#swimlane svg { display: block; }
.sw-lane { fill: var(--surface-2); }
.sw-lane-alt { fill: var(--surface); }
.sw-lane-lbl { font: 700 11px var(--f-mono); letter-spacing: .08em; fill: var(--pc); }
.sw-lane-sub { font: 400 10.5px var(--f-body); fill: var(--ink-3); }
.sw-bar { fill: var(--pc); opacity: .22; }
.sw-bar.crit { opacity: .5; }
.sw-arrow { fill: none; stroke: var(--ink-2); stroke-width: 1.3; }
.sw-arrow.crit { stroke: var(--crit); stroke-width: 1.8; }
.sw-if { fill: var(--gold); stroke: var(--navy); stroke-width: 1; cursor: pointer; }
.sw-if.crit { stroke: var(--crit); stroke-width: 2; }
.sw-if-lbl { font: 600 10px var(--f-mono); fill: var(--ink); }
.sw-recv { fill: var(--surface); stroke: var(--ink-2); stroke-width: 1.3; }
.sw-recv.crit { stroke: var(--crit); }
.if-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 8fr); gap: 16px; margin-top: 16px; max-width: 1480px; }
.matrix-wrap, .table-wrap { overflow-x: auto; }
.matrix { border-collapse: separate; border-spacing: 4px; width: 100%; font-size: 12px; }
.matrix th { font: 600 10.5px var(--f-mono); letter-spacing: .08em; color: var(--pc, var(--ink-3)); padding: 6px; text-align: center; }
.matrix th.row { text-align: right; }
.matrix td { background: var(--surface-2); border-radius: 4px; height: 58px; vertical-align: middle; text-align: center; padding: 4px; min-width: 70px; }
.matrix td.self { background: repeating-linear-gradient(135deg, var(--surface-2) 0 6px, var(--surface) 6px 12px); }
.matrix td.has { background: color-mix(in srgb, var(--gold) 16%, var(--surface)); }
.matrix .m-if { display: inline-block; margin: 2px; font: 600 10.5px var(--f-mono); padding: 3px 5px; border-radius: 3px; background: var(--surface); border: 1px solid var(--line-strong); cursor: pointer; }
.matrix .m-if.crit { border-color: var(--crit); color: var(--crit); }
.register { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.register th { text-align: left; font: 500 10px var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); padding: 6px 8px; border-bottom: 1px solid var(--line-strong); white-space: nowrap; }
.register td { padding: 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
.register td.mono { white-space: nowrap; font-size: 12px; }
.register tr { cursor: pointer; }
.register tr:hover td { background: var(--surface-2); }
.register .rg-name { font-weight: 550; }
.register .rg-flow { display: flex; align-items: center; gap: 4px; white-space: nowrap; }
.health { font: 600 10.5px/1 var(--f-mono); letter-spacing: .02em; padding: 4px 6px; border-radius: 3px; white-space: nowrap; }
.health.h-crit { color: var(--crit); background: color-mix(in srgb, var(--crit) 12%, transparent); }
.health.h-tight { color: var(--warn); background: color-mix(in srgb, var(--warn) 14%, transparent); }
.health.h-ok { color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, transparent); }
.delta { font: 600 11px var(--f-mono); }
.delta.up { color: var(--crit); }
.delta.down { color: var(--ok); }

/* ---------- Scenario Lab ---------- */
.lab { display: grid; grid-template-columns: minmax(260px, 360px) minmax(0, 1fr); gap: 22px; max-width: 1480px; align-items: start; }
.lab-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; position: sticky; top: 0; }
.lab-item {
  width: 100%; text-align: left; display: grid; gap: 6px;
  padding: 13px 14px; border-radius: 7px; border: 1px solid var(--line); background: var(--surface);
  transition: border-color .15s, box-shadow .15s;
}
.lab-item:hover { border-color: var(--line-strong); }
.lab-item.on { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold), var(--shadow); }
.lab-item .li-top { display: flex; gap: 8px; align-items: center; justify-content: space-between; }
.lab-item .li-n { font: 600 11px var(--f-mono); color: var(--ink-3); }
.lab-item .li-title { font-weight: 600; font-size: 14px; line-height: 1.3; }
.lab-item .li-res { font: 600 11px var(--f-mono); }
.lab-detail { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: clamp(18px, 2.4vw, 30px); min-width: 0; }
.ld-head { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.ld-title { margin: 12px 0 8px; font: 750 1.6rem/1.15 var(--f-display); font-stretch: 106%; text-wrap: balance; }
.ld-brief { margin: 0 0 22px; font-size: 15px; line-height: 1.6; color: var(--ink-2); max-width: 70ch; }
.predict { padding: 16px; border: 1px dashed var(--line-strong); border-radius: 7px; background: var(--surface-2); }
.predict p { margin: 0 0 10px; font-weight: 600; }
.predict-opts { display: flex; flex-wrap: wrap; gap: 8px; }
.predict-opts button { border: 1px solid var(--line-strong); background: var(--surface); padding: 8px 12px; border-radius: 5px; font-size: 13px; }
.predict-opts button.on { border-color: var(--navy); background: var(--navy); color: #fff; }
.predict-opts button.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 14%, var(--surface)); color: var(--ink); }
.predict-opts button.wrong { border-color: var(--crit); background: color-mix(in srgb, var(--crit) 10%, var(--surface)); color: var(--ink); }
.ld-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.verdict { margin: 22px 0 0; padding: 14px 16px; border-radius: 7px; font-size: 14px; }
.verdict.good { background: color-mix(in srgb, var(--ok) 11%, var(--surface)); border: 1px solid color-mix(in srgb, var(--ok) 40%, transparent); }
.verdict.bad { background: color-mix(in srgb, var(--crit) 8%, var(--surface)); border: 1px solid color-mix(in srgb, var(--crit) 35%, transparent); }
.res-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; margin: 24px 0 8px; border-top: 2px solid var(--ink); }
.res { padding: 14px 16px 14px 0; }
.res + .res { padding-left: 16px; border-left: 1px solid var(--line); }
.res-l { margin: 0; font: 500 10px/1.3 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.res-v { margin: 6px 0 2px; font: 750 34px/1 var(--f-display); font-stretch: 110%; font-variant-numeric: tabular-nums; }
.res-v.up { color: var(--crit); } .res-v.down { color: var(--ok); }
.res-n { margin: 0; font: 400 12px var(--f-mono); color: var(--ink-2); }
.ld-h { margin: 26px 0 10px; font: 600 10.5px/1 var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.impact { display: grid; gap: 10px; }
.impact-row { display: grid; grid-template-columns: 170px minmax(0, 1fr) 90px; gap: 12px; align-items: center; font-size: 13px; }
.impact-row .ir-track { height: 10px; background: var(--surface-3); border-radius: 5px; position: relative; overflow: hidden; }
.impact-row .ir-fill { position: absolute; top: 0; bottom: 0; background: var(--pc); border-radius: 5px; }
.impact-row b { font: 600 12px var(--f-mono); text-align: right; }
.lesson-box { margin-top: 24px; padding: 16px 18px; background: color-mix(in srgb, var(--gold) 10%, var(--surface)); border-left: 3px solid var(--gold); border-radius: 0 7px 7px 0; }
.lesson-box p { margin: 6px 0 0; line-height: 1.6; max-width: 76ch; }
.locked { color: var(--ink-3); font-size: 13px; margin-top: 14px; }

/* ---------- Learn ---------- */
.learn { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 24px; max-width: 1280px; align-items: start; }
.lesson-nav { display: grid; gap: 4px; position: sticky; top: 0; }
.lesson-nav button {
  text-align: left; border: 0; background: none; padding: 10px 12px; border-radius: 6px; display: grid; gap: 2px;
  border-left: 2px solid var(--line);
}
.lesson-nav button:hover { background: var(--surface); }
.lesson-nav button.on { background: var(--surface); border-left-color: var(--gold); box-shadow: var(--shadow); }
.lesson-nav .ln-k { font: 500 10px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.lesson-nav .ln-t { font-weight: 600; font-size: 13.5px; }
.lesson-nav .quiz-btn .ln-t { color: var(--gold-ink); }
.lesson { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: clamp(20px, 3vw, 40px); min-width: 0; }
.lesson h2 { font-size: 1.8rem; margin: 10px 0 18px; }
.lesson p { max-width: 68ch; font-size: 15.5px; line-height: 1.7; color: var(--ink-2); margin: 0 0 14px; }
.lesson p em, .lesson p strong { color: var(--ink); }
.lesson .eyebrow { font-size: 11px; line-height: 1.4; margin: 0; color: var(--gold-ink); }
.tries { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--line); }
.tries .btn::before { content: "→"; font-family: var(--f-mono); color: var(--gold-ink); }
.quiz-q { padding: 18px 0; border-bottom: 1px solid var(--line); }
.quiz-q:first-of-type { padding-top: 4px; }
.quiz-q h3 { margin: 0 0 12px; font: 600 15px/1.45 var(--f-body); display: flex; gap: 10px; }
.quiz-q h3 .qn { font: 600 12px/1.9 var(--f-mono); color: var(--gold-ink); flex: none; }
.quiz-opts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.quiz-opts button { text-align: left; border: 1px solid var(--line-strong); background: var(--surface); padding: 10px 12px; border-radius: 6px; font-size: 13.5px; }
.quiz-opts button:hover:not(:disabled) { border-color: var(--ink-3); }
.quiz-opts button.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 13%, var(--surface)); }
.quiz-opts button.wrong { border-color: var(--crit); background: color-mix(in srgb, var(--crit) 9%, var(--surface)); }
.quiz-opts button:disabled { cursor: default; }
.quiz-why { margin: 10px 0 0; font-size: 13.5px; color: var(--ink-2); max-width: 76ch; }
.quiz-score { display: flex; align-items: center; gap: 18px; padding: 16px 18px; margin-bottom: 8px; background: var(--surface-2); border-radius: 8px; }
.quiz-score .qs-n { font: 800 38px/1 var(--f-display); font-stretch: 115%; }
.quiz-score p { margin: 0; color: var(--ink-2); }

/* ---------- Tooltip & toast ---------- */
.tooltip {
  position: fixed; z-index: 50; pointer-events: none; max-width: 300px;
  background: #0E1729; color: #E7ECF5; border-radius: 6px; padding: 9px 11px;
  font-size: 12px; line-height: 1.45; box-shadow: 0 8px 24px rgba(0, 0, 0, .3);
  border: 1px solid rgba(255, 255, 255, .08);
}
.tooltip b { display: block; font: 600 10.5px/1.4 var(--f-mono); color: var(--pc, #C9A84C); letter-spacing: .05em; }
.tooltip .tt-meta { font-family: var(--f-mono); font-size: 11px; color: #A8B3C8; margin-top: 3px; }
.toast {
  position: fixed; z-index: 60; left: 50%; bottom: calc(46px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%);
  background: var(--navy); color: #fff; padding: 10px 16px; border-radius: 7px; font-size: 13px; box-shadow: 0 10px 30px rgba(0, 0, 0, .25);
  display: flex; gap: 10px; align-items: center; max-width: calc(100vw - 32px);
}
.toast b { color: var(--gold); font-family: var(--f-mono); font-weight: 600; white-space: nowrap; }

/* ---------- Responsive ---------- */
@media (max-width: 1280px) {
  .titleblock > div:nth-child(2) { display: none; }
  .kpis { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .kpi:nth-child(3n) { border-right: 0; }
  .kpi:nth-child(4) { padding-left: 0; }
  .kpi:nth-child(-n+3) { border-bottom: 1px solid var(--line); }
}
@media (max-width: 1100px) {
  .app { grid-template-columns: 68px minmax(0, 1fr); }
  .brand { width: 68px; padding: 0 17px; }
  .brand-text, .rail-link span, .rail-link kbd, .rail-legend { display: none; }
  .rail-link { justify-content: center; padding: 11px 0; }
  .ov-hero { grid-template-columns: minmax(0, 1fr); }
  .party-grid { grid-template-columns: minmax(0, 1fr); }
  .if-grid, .lab, .learn { grid-template-columns: minmax(0, 1fr); }
  .lab-list, .lesson-nav { position: static; }
  .fd { grid-template-columns: minmax(0, 1fr); grid-template-rows: minmax(0, 1fr) auto auto; grid-template-areas: "stage" "time" "side"; }
  .fd-side { max-height: 30vh; border-left: 0; border-top: 1px solid var(--line); grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
  :root { --lw: 470px; }
  .c-date:nth-of-type(5) { display: none; }
  .dt-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .app { grid-template-columns: minmax(0, 1fr); grid-template-rows: 56px minmax(0, 1fr) 58px; grid-template-areas: "top" "main" "rail"; }
  .statusbar { display: none; }
  .titleblock { display: none; }
  .brand { width: auto; padding: 0 14px; }
  .brand-text { display: flex; }
  .rail { flex-direction: row; padding: 4px 6px calc(4px + env(safe-area-inset-bottom, 0px)); overflow-x: auto; gap: 0; }
  .rail-link { flex: 1; flex-direction: column; gap: 3px; padding: 6px 4px; font-size: 10px; min-width: 60px; }
  .rail-link span { display: block; }
  .rail-link.active::before { left: 12px; right: 12px; top: -4px; bottom: auto; width: auto; height: 3px; }
  .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .kpi { padding-left: 0 !important; border-right: 0 !important; border-bottom: 1px solid var(--line); }
  :root { --lw: 250px; }
  .c-dur, .c-date, .c-tf { display: none; }
  .pg-details { height: 210px; }
  .dt-grid, .rel-cols, .quiz-opts { grid-template-columns: minmax(0, 1fr); }
  .res-grid { grid-template-columns: minmax(0, 1fr); }
  .res + .res { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .impact-row { grid-template-columns: 110px minmax(0, 1fr) 70px; }
  .fd-hud { flex-direction: column; }
  .fd-controls { justify-items: start; }
  .fd-toggles { justify-content: flex-start; }
  .fd-cams { display: none; }
  .search input { width: 110px; }
  .stage-caption { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ==========================================================================
   4D INSPECTOR — tool rail, section panel, banner, walk HUD, element card,
   model tree. Styled only through the shared tokens so both themes hold.
   ========================================================================== */
.tools {
  position: absolute; left: 14px; top: 214px; z-index: 4;
  display: flex; flex-direction: column; gap: 2px; padding: 5px;
  background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--line); border-radius: 9px; box-shadow: var(--shadow);
}
.tool { width: 38px; height: 38px; display: grid; place-items: center; border: 0; background: none; border-radius: 6px; color: var(--ink-2); position: relative; }
.tool svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.tool:hover { background: var(--surface-3); color: var(--ink); }
.tool.on { background: var(--navy); color: #fff; }
.tool[data-tool="section"] { margin-top: 5px; }
.tool[data-tool="section"]::before, .tool[data-tool="walk"]::before { content: ""; position: absolute; top: -4px; left: 7px; right: 7px; height: 1px; background: var(--line); }
.sec-panel {
  position: absolute; left: 66px; top: 214px; z-index: 5; width: min(330px, calc(100% - 90px));
  max-height: calc(100% - 290px); overflow-y: auto;
  background: color-mix(in srgb, var(--surface) 96%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--line); border-radius: 9px; box-shadow: var(--shadow); padding: 12px 14px 14px;
}
.sp-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.sp-x { border: 0; background: none; font-size: 20px; line-height: 1; color: var(--ink-3); width: 28px; height: 28px; border-radius: 5px; }
.sp-x:hover { background: var(--surface-3); color: var(--ink); }
.sp-presets { display: grid; gap: 5px; margin-bottom: 12px; }
.sp-presets button {
  text-align: left; padding: 8px 10px; border-radius: 6px; border: 1px solid var(--line); background: var(--surface-2);
  font-size: 12.5px; font-weight: 550; color: var(--ink);
}
.sp-presets button::before { content: "→ "; color: var(--gold-ink); font-family: var(--f-mono); }
.sp-presets button:hover { border-color: var(--gold); }
.sp-planes { display: grid; gap: 10px; padding-top: 10px; border-top: 1px solid var(--line); }
.sp-row .chk { font-weight: 550; color: var(--ink); }
.sp-row .chk .muted { font-weight: 400; font-size: 11.5px; }
.sp-ctl { display: grid; grid-template-columns: minmax(0, 1fr) 58px auto; gap: 8px; align-items: center; margin-top: 4px; opacity: .55; }
.sp-row.on .sp-ctl { opacity: 1; }
.sp-ctl input[type=range] { width: 100%; accent-color: var(--gold); }
.sp-ctl output { font-size: 11.5px; text-align: right; color: var(--ink-2); }
.sp-flip { border: 1px solid var(--line-strong); background: var(--surface); border-radius: 4px; font: 500 11px var(--f-mono); padding: 4px 7px; color: var(--ink-2); }
.sp-flip[aria-pressed="true"] { background: var(--sel); border-color: var(--gold); color: var(--ink); }
.sp-foot { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.sp-foot .btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.sp-note { margin: 10px 0 0; font-size: 11.5px; color: var(--ink-3); display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.hatch { display: inline-block; width: 22px; height: 11px; border-radius: 2px; background: repeating-linear-gradient(135deg, #C9A84C 0 3px, #8C6E24 3px 6px); }
.tool-banner { position: absolute; top: 14px; left: 50%; transform: translateX(-50%); z-index: 4; display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; max-width: 40%; }
.tb-chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 5px 5px 11px; border-radius: 16px; font-size: 12px;
  background: var(--navy); color: #fff; box-shadow: var(--shadow); white-space: nowrap;
}
.tb-chip b { color: var(--gold); font-weight: 600; max-width: 180px; overflow: hidden; text-overflow: ellipsis; }
.tb-chip.sec { background: #8C6E24; }
.tb-chip button { border: 0; width: 22px; height: 22px; border-radius: 50%; background: rgba(255, 255, 255, .16); color: #fff; font-size: 14px; line-height: 1; }
.tb-chip button:hover { background: rgba(255, 255, 255, .3); }
.walk-hud {
  position: absolute; left: 50%; bottom: 16px; transform: translateX(-50%); z-index: 5;
  display: flex; flex-direction: column; align-items: center; gap: 10px; width: min(560px, calc(100% - 28px));
  background: color-mix(in srgb, var(--surface) 94%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--gold); border-radius: 10px; padding: 12px 14px; box-shadow: var(--shadow); text-align: center;
}
.walk-hud p { margin: 0; font-size: 12.5px; color: var(--ink-2); }
.walk-hud p b { color: var(--gold-ink); margin-right: 6px; }
.walk-pad { display: grid; grid-template-columns: repeat(6, 44px); gap: 6px; }
.walk-pad button { height: 36px; border-radius: 6px; border: 1px solid var(--line-strong); background: var(--surface); font: 600 12px var(--f-mono); color: var(--ink); touch-action: none; user-select: none; -webkit-user-select: none; }
.walk-pad button:active { background: var(--sel); border-color: var(--gold); }
.fd-stage.walking .fd-cams, .fd-stage.walking .tools { display: none; }
.fd-stage.walking canvas { cursor: move; }

/* Element card */
.inspect-empty { margin: 0; font-size: 12.5px; line-height: 1.5; color: var(--ink-2); padding: 10px 12px; background: var(--surface-2); border-radius: 6px; border: 1px dashed var(--line-strong); }
.inspect-card { border: 1px solid var(--line); border-top: 3px solid var(--pc); border-radius: 7px; padding: 12px; background: var(--surface-2); }
.ic-zone { margin: 0; font: 500 10px/1.3 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.ic-name { margin: 3px 0 10px; font: 700 16px/1.25 var(--f-display); font-stretch: 104%; }
.ic-grid { margin: 0; display: grid; gap: 7px; }
.ic-grid dt { font: 500 9.5px/1.2 var(--f-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.ic-grid dd { margin: 2px 0 0; font-size: 12.5px; line-height: 1.35; }
.ic-actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.ic-actions .btn { height: 30px; padding: 0 10px; font-size: 12px; }
.ic-actions .btn-primary { flex-basis: 100%; justify-content: center; }

/* Model tree */
.tree-filters { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 8px; }
.tree-filters button { border: 1px solid var(--line-strong); background: var(--surface); border-radius: 4px; padding: 4px 7px; font: 600 10.5px var(--f-mono); color: var(--ink-2); display: inline-flex; align-items: center; gap: 5px; }
.tree-filters button i { width: 7px; height: 7px; border-radius: 1px; background: var(--pc); }
.tree-filters button.on { background: var(--navy); color: #fff; border-color: var(--navy); }
.tree-filters .tf-crit { color: var(--crit); }
.tree-filters .tf-crit.on { background: var(--crit); border-color: var(--crit); color: #fff; }
.tree-ctx { font-size: 11.5px; margin-bottom: 8px; }
.tree, .tree ul { list-style: none; margin: 0; padding: 0; }
.tree { border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.tz + .tz { border-top: 1px solid var(--line); }
.tz-row { display: flex; align-items: center; }
.tz-toggle { flex: 1; min-width: 0; display: flex; align-items: center; gap: 6px; border: 0; background: none; padding: 8px 8px; font-size: 12.5px; font-weight: 600; text-align: left; color: var(--ink); }
.tz-toggle svg { width: 12px; height: 12px; fill: none; stroke: currentColor; stroke-width: 1.8; transition: transform .15s; flex: none; }
.tz.open .tz-toggle svg { transform: rotate(90deg); }
.tz-toggle .muted { font: 500 11px var(--f-mono); }
.tz-toggle:hover { background: var(--surface-2); }
.tz-iso { border: 0; background: none; font: 500 10.5px var(--f-mono); color: var(--ink-3); padding: 6px 8px; border-radius: 4px; margin-right: 4px; }
.tz-iso:hover { color: var(--ink); background: var(--surface-3); }
.tz-iso.on { color: #fff; background: var(--navy); }
.tz ul { background: var(--surface-2); padding: 3px 0; }
.te { display: flex; align-items: center; }
.te.sel { background: var(--sel); }
.te.hid .te-name { opacity: .45; text-decoration: line-through; }
.te-eye { border: 0; background: none; width: 30px; height: 28px; display: grid; place-items: center; color: var(--ink-3); flex: none; }
.te-eye svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.6; }
.te-eye:hover { color: var(--ink); }
.te-name { flex: 1; min-width: 0; border: 0; background: none; text-align: left; font-size: 12px; padding: 5px 8px 5px 0; color: var(--ink); display: flex; align-items: center; gap: 7px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.te-name:hover { color: var(--gold-ink); }
.st { width: 7px; height: 7px; border-radius: 50%; flex: none; border: 1.5px solid var(--pc); }
.st-done { background: var(--pc); }
.st-wip { background: linear-gradient(90deg, var(--pc) 50%, transparent 50%); }
.tb-3d { height: 26px; font-size: 12px; border-color: var(--gold); color: var(--ink); }
.tb-3d::before { content: "◆"; color: var(--gold); font-size: 10px; }

@media (max-width: 1100px) {
  .tools { top: auto; bottom: 64px; left: 14px; flex-direction: row; }
  .tool[data-tool="section"], .tool[data-tool="walk"] { margin-top: 0; }
  .tool[data-tool="section"]::before, .tool[data-tool="walk"]::before { display: none; }
  .sec-panel { top: auto; bottom: 118px; left: 14px; max-height: 55%; }
  .tool-banner { top: auto; bottom: 118px; max-width: 90%; }
}
@media (max-width: 760px) {
  .tools { bottom: 14px; overflow-x: auto; max-width: calc(100% - 28px); }
  .walk-pad { grid-template-columns: repeat(3, 44px); }
}

/* On-stage Play / Pause (always visible in the status card) */
.fd-playrow { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.hud-play { display: inline-flex; align-items: center; gap: 8px; height: 34px; padding: 0 14px 0 11px; border-radius: 17px; border: 0; background: var(--navy); color: #fff; font-weight: 600; font-size: 13px; }
.hud-play svg { width: 14px; height: 14px; fill: currentColor; }
.hud-play .i-pause { display: none; }
.hud-play.playing { background: var(--gold); color: #1B2A4A; }
.hud-play.playing .i-play { display: none; }
.hud-play.playing .i-pause { display: block; }
.fd-playstate { font-size: 11px; color: var(--ink-3); }

/* ==========================================================================
   Rev C04 additions: knowledge-check modes, reset/undo, interface floats,
   scenario facts, Scope & Basis
   ========================================================================== */
.brandline strong { color: var(--ink); }
.reset-btn { height: 32px; }
.linkish { border: 0; background: none; padding: 0; color: var(--gold-ink); font: inherit; font-weight: 600; text-decoration: underline; cursor: pointer; }
.toast { gap: 14px; }
.toast-act { border: 1px solid rgba(255, 255, 255, .4); background: transparent; color: #fff; border-radius: 5px; padding: 4px 10px; font-weight: 600; font-size: 12.5px; white-space: nowrap; }
.toast-act:hover { background: rgba(255, 255, 255, .12); }
.pg-empty { display: grid; justify-items: center; gap: 12px; padding: 48px 20px; color: var(--ink-2); }
.pg-empty p { margin: 0; }
.dt-hidden { padding: 7px 16px; background: color-mix(in srgb, var(--warn) 14%, var(--surface)); font-size: 12.5px; color: var(--ink); }
.card-note { margin: -6px 0 12px; font-size: 12.5px; color: var(--ink-2); max-width: 80ch; }
.quiz-modes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin: 4px 0 10px; }
.quiz-modes button { text-align: left; display: grid; gap: 3px; padding: 11px 13px; border-radius: 7px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink); }
.quiz-modes button b { font-size: 13.5px; }
.quiz-modes button span { font-size: 12px; color: var(--ink-3); }
.quiz-modes button.on { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold); background: var(--sel); }
.quiz-basis { margin: 0 0 12px; font-size: 11.5px; color: var(--ink-3); }
.quiz-stale { margin: 0 0 12px; padding: 10px 12px; border-radius: 6px; background: color-mix(in srgb, var(--warn) 14%, var(--surface)); font-size: 13px; display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.assume { margin: 0 0 18px; padding: 12px 14px; border-radius: 7px; border: 1px dashed var(--gold); background: color-mix(in srgb, var(--gold) 7%, var(--surface)); }
.assume ul { margin: 6px 0 0; padding-left: 18px; font-size: 13.5px; color: var(--ink-2); }
.facts-list { margin: 0; padding-left: 18px; display: grid; gap: 5px; font-size: 14px; color: var(--ink-2); }
.facts-list b { color: var(--ink); }
.cf-box { margin-top: 14px; padding: 12px 14px; border-radius: 7px; background: var(--surface-2); border: 1px solid var(--line); }
.cf-box .eyebrow { margin-bottom: 6px; }
.new-if { margin: 8px 0 0; font-size: 13px; color: var(--ink-2); }
.basis-flag { max-width: 1480px; margin: 0 0 18px; padding: 10px 14px; border-radius: 6px; background: color-mix(in srgb, var(--warn) 12%, var(--surface)); border: 1px solid color-mix(in srgb, var(--warn) 35%, transparent); font-size: 13.5px; }
.sb-sec { max-width: 1480px; margin-bottom: 30px; }
.sb-sec h2 { margin-bottom: 10px; }
.sb-brief { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; margin: 0; border-top: 2px solid var(--ink); }
.sb-brief > div { padding: 12px 16px 12px 0; border-bottom: 1px solid var(--line); }
.sb-brief > div:nth-child(even) { padding-left: 16px; border-left: 1px solid var(--line); }
.sb-brief dt { font: 500 10px/1.3 var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.sb-brief dd { margin: 4px 0 0; font-size: 14px; }
.sb-two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 22px; }
.sb-ids .linkish { font-size: 11.5px; margin-right: 4px; }
.sb-map { max-height: 460px; overflow: auto; border: 1px solid var(--line); border-radius: 6px; }
.sb-map th { position: sticky; top: 0; background: var(--surface); }
.sb-list { margin: 0; padding-left: 18px; display: grid; gap: 4px; color: var(--ink-2); }
.scene-label { font-size: 11.5px; }
@media (max-width: 1100px) { .sb-two, .sb-brief, .quiz-modes { grid-template-columns: minmax(0, 1fr); } .sb-brief > div:nth-child(even) { padding-left: 0; border-left: 0; } }
.sp-jump { margin: 0 0 12px; padding: 9px 11px; border-radius: 6px; background: color-mix(in srgb, var(--warn) 13%, var(--surface)); font-size: 12.5px; line-height: 1.45; }
.walk-actions { display: flex; gap: 8px; }
.compass { position: absolute; right: 14px; bottom: 14px; z-index: 3; display: flex; align-items: center; gap: 8px; pointer-events: none; font: 500 10.5px var(--f-mono); color: var(--ink-2); background: color-mix(in srgb, var(--surface) 88%, transparent); border: 1px solid var(--line); border-radius: 22px; padding: 4px 10px 4px 4px; }
.compass svg { width: 36px; height: 36px; }
.compass circle { fill: var(--surface); stroke: var(--line-strong); }
.compass .n { fill: var(--crit); } .compass .s { fill: var(--ink-3); }
.compass text { font: 700 8px var(--f-mono); fill: var(--ink); text-anchor: middle; }
.stage-lost { background: color-mix(in srgb, var(--surface) 92%, transparent); z-index: 6; gap: 8px; }
@media (max-width: 760px) { .compass span { display: none; } }
/* F09: the 4D workspace must fit its container. Without an explicit minmax(0,1fr) row, a
   long inspector (model tree) grew the implicit grid row and pushed the transport bar off-screen. */
#view-build { grid-template-rows: minmax(0, 1fr); }
.fd { min-height: 0; overflow: hidden; }
.fd-side { min-height: 0; overscroll-behavior: contain; }
.scenario-pill { max-width: 250px; }
@media (max-width: 1500px) { .app:has(#scenario-pill:not([hidden])) .titleblock > div:first-child { display: none; } }

/* Large screens (≥1600 px): classroom pages use the full width instead of a
   1480 px column that left the right-hand side empty on big monitors.
   Reading text keeps its own line-length limits (ch-based). */
@media (min-width: 1600px) {
  .ov-hero, .kpis, .ov-section, .lab, .if-grid, .swim-card, .sb-sec, .basis-flag { max-width: none; }
  .learn { max-width: 1680px; }
  .page-head { max-width: 1400px; }
}
@media (min-width: 1800px) {
  .fd { grid-template-columns: minmax(0, 1fr) 360px; }
  .kpi-value { font-size: 34px; }
}