/* Pretext Lab — Typographer's Workbench */

@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:wght@500;600;700&family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --paper: #faf7f2;
  --paper-warm: #f2ecdf;
  --paper-deep: #e8ddc5;
  --paper-edge: #ded0b3;

  --ink: #1f1d28;
  --ink-2: #2e2a3a;
  --muted: #6e6875;
  --muted-soft: #a09aab;

  --clay: #b8653d;
  --clay-dim: rgba(184, 101, 61, 0.14);
  --clay-faint: rgba(184, 101, 61, 0.06);

  --sage: #6f8e7c;
  --indigo: #4d5b7e;
  --baseline: rgba(77, 91, 126, 0.22);
  --measure: #c9b888;

  --line: rgba(31, 29, 40, 0.12);
  --line-strong: rgba(31, 29, 40, 0.24);

  --code-bg: rgba(184, 101, 61, 0.09);
  --code-fg: #8b3b2a;

  --sidebar-width: 260px;
  --sidebar-collapsed-width: 44px;

  --layer-analyze: #8a5a3d;
  --layer-fit: #4d7e5b;
  --layer-render: #4d5b7e;

  --serif: "EB Garamond", "Source Serif 4", Georgia, serif;
  --display: "Bricolage Grotesque", "EB Garamond", Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--clay); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ═══════════════════════════════════════════════════════════════
   LESSON HEADER (per-page)
   ═══════════════════════════════════════════════════════════════ */
header.lab-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 22px 32px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  background-color: rgba(250, 247, 242, 0.92);
}
.lab-header .brand {
  font-family: var(--display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.lab-header .brand a { color: inherit; }
.lab-header .brand a:hover { text-decoration: none; color: var(--clay); }
.lab-header .crumbs {
  font-size: 13px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 14px;
}
.lab-header .crumb-lesson {
  color: var(--ink);
  font-weight: 500;
}
.lab-header .crumb-lesson .num {
  color: var(--muted);
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  margin-right: 6px;
}
.lab-header nav.prev-next {
  display: flex;
  gap: 6px;
}
.lab-header nav.prev-next a,
.lab-header nav.prev-next span {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 12.5px;
  color: var(--ink);
  text-decoration: none;
  transition: all 100ms ease;
  background: var(--paper-warm);
}
.lab-header nav.prev-next a:hover {
  background: var(--clay-dim);
  border-color: var(--clay);
  text-decoration: none;
}
.lab-header nav.prev-next span {
  color: var(--muted-soft);
  background: transparent;
  cursor: default;
}

/* ═══════════════════════════════════════════════════════════════
   LESSON MAIN
   ═══════════════════════════════════════════════════════════════ */
main.lesson {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 32px 120px;
}

h1.lesson-title {
  font-family: var(--display);
  font-size: 34px;
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.12;
  margin-bottom: 6px;
}
.lesson-subtitle {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 24px;
  font-family: var(--mono);
  font-weight: 500;
}

/* ═══════════════════════════════════════════════════════════════
   DEMO STAGE — Typographer's Workbench proper
   ═══════════════════════════════════════════════════════════════ */
.demo-stage {
  position: relative;
  padding: 40px 44px 36px 44px;
  background: #fcfaf4;
  border: 1px solid var(--paper-edge);
  border-radius: 8px;
  margin-bottom: 22px;
  box-shadow: 0 8px 24px -18px rgba(31, 29, 40, 0.35);
  overflow: hidden;
}
.demo-stage.split { padding: 0; }
.demo-stage.split > .pane {
  padding: 40px 44px 36px;
  border-right: 1px solid var(--paper-edge);
}
.demo-stage.split > .pane:last-child { border-right: none; }

/* The actual text canvas — a box with fixed width that text wraps into */
.demo-text-region {
  position: relative;
  display: block;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 100%;
  height: 340px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--paper-edge) transparent;
  transition: width 120ms ease;
}
.demo-text-region::-webkit-scrollbar { width: 6px; }
.demo-text-region::-webkit-scrollbar-track { background: transparent; }
.demo-text-region::-webkit-scrollbar-thumb { background: var(--paper-edge); border-radius: 3px; }
.demo-text-region p {
  margin: 0;
  hyphens: manual;
  font-feature-settings: "kern" 1, "liga" 1, "onum" 1;
}
.demo-text-region p + p { margin-top: 0.5em; }

/* Baseline grid (SVG overlay inside demo-text-region) */
.baseline-grid {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: none;
  z-index: 0;
  width: 100%;
}
.demo-text-region > p { position: relative; z-index: 1; }

/* Width caliper — lives below the text region */
.width-caliper {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  height: 14px;
  transition: width 120ms ease;
}
.caliper-left,
.caliper-right {
  color: var(--measure);
  font-family: var(--serif);
  font-size: 16px;
}
.caliper-bar {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--paper-edge) 20%, var(--paper-edge) 80%, transparent);
}
.caliper-readout {
  color: var(--ink);
  font-weight: 500;
  white-space: nowrap;
  padding: 0 6px;
}

/* Per-line widths column, pinned to the right side of the demo-stage */
.line-widths {
  position: absolute;
  top: 40px;
  right: 10px;
  display: flex;
  flex-direction: column;
  gap: 0;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted-soft);
  line-height: calc(20px * 1.55);
  font-variant-numeric: tabular-nums;
  pointer-events: none;
  text-align: right;
  min-width: 52px;
}
.line-widths span { display: block; }
.line-widths span.marked { color: var(--clay); font-weight: 500; }

/* Ghost ruler — pale underlines beneath each segment. Opt-in via .show-ghost-ruler */
.demo-text-region.show-ghost-ruler .ghost-seg {
  border-bottom: 1px dashed rgba(184, 101, 61, 0.3);
  margin-bottom: -1px;
}

/* FPS readout (overlay on demo stage) */
.fps-readout {
  position: absolute;
  top: 12px;
  right: 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--muted);
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(250, 247, 242, 0.8);
  font-variant-numeric: tabular-nums;
}
.fps-readout.warn { color: var(--clay); border-color: var(--clay-dim); }
.fps-readout.ok { color: var(--sage); border-color: rgba(111, 142, 124, 0.3); }

/* Workload badge (overlay on demo stage, mirrors fps-readout) */
.workload-badge {
  position: absolute;
  top: 12px;
  left: 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--muted);
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(250, 247, 242, 0.8);
  font-variant-numeric: tabular-nums;
}

/* Pane labels for split demos */
.pane-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px dotted var(--line);
}

/* ═══════════════════════════════════════════════════════════════
   ANALYZE · FIT · RENDER STAMP
   ═══════════════════════════════════════════════════════════════ */
.afr-stamp {
  display: inline-flex;
  gap: 8px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 14px 0 22px;
}
.afr-pill {
  padding: 3px 10px;
  border-radius: 2px;
  color: var(--muted-soft);
  background: transparent;
  border: 1px solid var(--line);
  transition: color 120ms ease;
}
.afr-pill--active.afr-pill--analyze { color: var(--layer-analyze); border-color: var(--layer-analyze); background: rgba(138, 90, 61, 0.06); }
.afr-pill--active.afr-pill--fit     { color: var(--layer-fit);     border-color: var(--layer-fit);     background: rgba(77, 126, 91, 0.06); }
.afr-pill--active.afr-pill--render  { color: var(--layer-render);  border-color: var(--layer-render);  background: rgba(77, 91, 126, 0.06); }

/* ═══════════════════════════════════════════════════════════════
   CONTROLS (slider panel)
   ═══════════════════════════════════════════════════════════════ */
.controls {
  display: grid;
  gap: 12px;
  padding: 18px 22px;
  background: var(--paper-warm);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 36px;
}
.controls .control {
  display: grid;
  grid-template-columns: 110px 1fr 68px;
  align-items: center;
  gap: 14px;
}
.controls label {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink);
  font-weight: 500;
}
.controls .value {
  font-variant-numeric: tabular-nums;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  text-align: right;
}
.controls input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 2px;
  background: var(--paper-deep);
  border-radius: 1px;
  outline: none;
}
.controls input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 0;
  background: var(--clay);
  border: 2px solid var(--paper);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(31, 29, 40, 0.18);
  transition: transform 100ms ease;
}
.controls input[type="range"]:hover::-webkit-slider-thumb { transform: scale(1.15); }
.controls input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 0;
  background: var(--clay);
  border: 2px solid var(--paper);
  cursor: pointer;
}
.controls button.toggle {
  grid-column: 1 / -1;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink);
  font-size: 12px;
  cursor: pointer;
  font-family: var(--mono);
  transition: all 100ms ease;
  justify-self: start;
}
.controls button.toggle:hover { background: var(--clay-dim); border-color: var(--clay); }
.controls button.toggle[data-active="true"] { background: var(--clay); color: white; border-color: var(--clay); }

.controls select {
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--paper);
  color: var(--ink);
}

/* ═══════════════════════════════════════════════════════════════
   BLOCKS (mechanism / application / content / direct-claude)
   ═══════════════════════════════════════════════════════════════ */
.block { margin-bottom: 28px; }
.block > h3 {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}
.block p { margin-bottom: 10px; }
.block p:last-child { margin-bottom: 0; }

.block--mechanism {
  padding: 18px 22px;
  background: var(--paper-warm);
  border-left: 3px solid var(--indigo);
  border-radius: 0 4px 4px 0;
}
.block--mechanism > h3 { color: var(--indigo); }

.block--application {
  padding: 18px 22px;
  background: rgba(111, 142, 124, 0.07);
  border-left: 3px solid var(--sage);
  border-radius: 0 4px 4px 0;
}
.block--application > h3 { color: var(--sage); }

.block--content {
  padding: 22px 24px;
  background: white;
  border: 1px solid var(--paper-edge);
  border-radius: 6px;
  font-family: var(--serif);
  font-size: 17.5px;
  line-height: 1.7;
  color: var(--ink-2);
  font-style: italic;
}
.block--content cite {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--muted);
  font-style: normal;
  font-family: var(--sans);
  letter-spacing: 0.02em;
}
.block--content cite:before { content: "— "; }

.block--direct {
  padding: 20px 24px;
  background: white;
  border: 1px solid var(--line);
  border-radius: 6px;
}
.block--direct > h3 { color: var(--clay); }
.block--direct .verb-map {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 18px;
  margin-top: 6px;
  font-size: 14.5px;
  font-family: var(--serif);
}
.block--direct .verb-map .phrase {
  font-style: italic;
  color: var(--ink);
}
.block--direct .verb-map .arrow { color: var(--muted-soft); }
.block--direct .verb-map .mapping {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--code-fg);
  font-style: normal;
}
.block--direct .meta {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--muted);
  font-style: italic;
}

.block--break {
  padding: 18px 22px;
  background: var(--paper-warm);
  border: 1px dashed var(--line-strong);
  border-radius: 4px;
}
.block--break > h3 { color: var(--ink); }
.block--break em { color: var(--muted); }

/* ═══════════════════════════════════════════════════════════════
   TYPOGRAPHY
   ═══════════════════════════════════════════════════════════════ */
p { margin: 0.7em 0; }
strong { font-weight: 600; color: var(--ink); }
em { font-style: italic; color: var(--muted); }
code {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 1.5px 6px;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.9em;
  font-weight: 500;
}

/* ═══════════════════════════════════════════════════════════════
   CODE TOGGLE BLOCK
   ═══════════════════════════════════════════════════════════════ */
.code-block {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.code-block .toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.code-block button.code-toggle {
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--paper-warm);
  color: var(--ink);
  font-size: 12px;
  font-family: var(--mono);
  cursor: pointer;
  transition: all 100ms ease;
}
.code-block button.code-toggle:hover { background: var(--clay-dim); border-color: var(--clay); }
.code-block .code-label {
  font-size: 12.5px;
  color: var(--muted);
  font-style: italic;
}
.code-block pre {
  background: #1f1d28;
  color: #e8e3d3;
  border-radius: 6px;
  padding: 18px 22px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  display: none;
}
.code-block pre.visible { display: block; }
.code-block pre .js-kw { color: #c46c54; }
.code-block pre .js-str { color: #9ab48a; }
.code-block pre .js-num { color: #e0b86e; }
.code-block pre .js-comment { color: #6b6578; font-style: italic; }

/* ═══════════════════════════════════════════════════════════════
   SIDEBAR NAVIGATION (injected by nav.js, pl- prefix)
   ═══════════════════════════════════════════════════════════════ */
body.pl-has-sidebar { display: flex; min-height: 100vh; }

.pl-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  max-height: 100vh;
  overflow-y: auto;
}

#pl-sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  position: sticky;
  top: 0;
  background: var(--paper);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 200ms ease, min-width 200ms ease;
  z-index: 20;
}
#pl-sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
  min-width: var(--sidebar-collapsed-width);
}
#pl-sidebar.collapsed .pl-sidebar-brand,
#pl-sidebar.collapsed .pl-sidebar-nav { display: none; }

.pl-sidebar-toggle {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 44px;
  border: none;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 100ms ease, background 100ms ease;
}
.pl-sidebar-toggle:hover { background: var(--clay-faint); color: var(--clay); }

.pl-sidebar-brand {
  display: block;
  padding: 14px 18px 10px;
  font-family: var(--display);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--line);
}
.pl-sidebar-brand:hover { color: var(--clay); text-decoration: none; }
.pl-sidebar-brand.active { color: var(--clay); }

.pl-sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 10px 0 24px;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}
.pl-sidebar-nav::-webkit-scrollbar { width: 5px; }
.pl-sidebar-nav::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 3px; }

.pl-arc-header {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 10px 16px 6px;
  border: none;
  background: transparent;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clay);
  cursor: pointer;
  text-align: left;
}
.pl-arc-header:hover { color: var(--ink); }
.pl-arc-arrow {
  font-size: 10px;
  width: 12px;
  text-align: center;
  color: var(--muted-soft);
}

.pl-lesson-list { padding: 0; }
.pl-lesson-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 16px 5px 18px;
  font-size: 13.5px;
  color: var(--ink);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background 80ms ease, border-color 80ms ease, color 80ms ease;
  line-height: 1.35;
}
.pl-lesson-link:hover {
  background: var(--clay-faint);
  border-left-color: var(--muted-soft);
  text-decoration: none;
}
.pl-lesson-link.active {
  background: var(--clay-dim);
  border-left-color: var(--clay);
  color: var(--clay);
  font-weight: 600;
}
.pl-lesson-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  color: var(--muted-soft);
  min-width: 20px;
}
.pl-lesson-link.active .pl-lesson-num { color: var(--clay); }

/* Community link — separator above, distinctive */
.pl-community-link {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--clay);
  font-weight: 500;
  font-style: italic;
  font-family: var(--serif);
  font-size: 14px;
}
.pl-community-link .pl-lesson-num {
  color: var(--clay);
  font-style: normal;
}
.pl-community-link.active {
  background: var(--clay-dim);
  border-left-color: var(--clay);
}

@media (max-width: 900px) {
  #pl-sidebar {
    position: fixed;
    left: 0; top: 0;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 200ms ease;
    box-shadow: none;
    z-index: 100;
  }
  body.pl-sidebar-open #pl-sidebar {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(31, 29, 40, 0.15);
  }
  #pl-sidebar.collapsed {
    transform: translateX(-100%);
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
  }
  #pl-sidebar.collapsed .pl-sidebar-brand,
  #pl-sidebar.collapsed .pl-sidebar-nav { display: block; }
  body.pl-has-sidebar .pl-sidebar-toggle {
    position: fixed;
    top: 8px; left: 8px;
    width: 36px; height: 36px;
    border-radius: 6px;
    background: var(--paper);
    border: 1px solid var(--line);
    z-index: 101;
    box-shadow: 0 2px 8px rgba(31, 29, 40, 0.1);
  }
}

/* ═══════════════════════════════════════════════════════════════
   INDEX / TOC PAGE
   ═══════════════════════════════════════════════════════════════ */
.toc-page main {
  max-width: 920px;
  margin: 0 auto;
  padding: 64px 32px 120px;
}
.toc-page h1 {
  font-family: var(--display);
  font-size: 44px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.toc-page .tagline {
  font-size: 16px;
  color: var(--muted);
  margin-bottom: 44px;
  max-width: 640px;
  line-height: 1.55;
  font-family: var(--serif);
  font-style: italic;
}
.toc-page .arc-section {
  margin-bottom: 28px;
  padding: 22px 26px;
  background: white;
  border: 1px solid var(--paper-edge);
  border-radius: 8px;
}
.toc-page .arc-section.disabled { opacity: 0.55; }
.toc-page .arc-label {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clay);
  margin-bottom: 4px;
}
.toc-page .arc-title {
  font-family: var(--display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin-bottom: 14px;
}
.toc-page .lesson-list {
  list-style: none;
  padding: 0;
}
.toc-page .lesson-list li {
  padding: 6px 0;
  border-bottom: 1px dotted var(--line);
}
.toc-page .lesson-list li:last-child { border-bottom: none; }
.toc-page .lesson-list a {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: baseline;
  gap: 12px;
  color: var(--ink);
  padding: 4px 0;
  text-decoration: none;
  transition: color 100ms ease;
}
.toc-page .lesson-list a:hover { color: var(--clay); text-decoration: none; }
.toc-page .lesson-list .num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  color: var(--muted);
}
.toc-page .lesson-list .title {
  font-family: var(--serif);
  font-size: 16px;
}
.toc-page .lesson-list .tags {
  font-size: 10.5px;
  color: var(--muted-soft);
  font-family: var(--mono);
  letter-spacing: 0.06em;
}
.toc-page .lesson-list li.coming-soon a { cursor: default; color: var(--muted-soft); }
.toc-page .lesson-list li.coming-soon a:hover { color: var(--muted-soft); }
.toc-page .note {
  margin-top: 36px;
  padding: 16px 20px;
  background: var(--clay-faint);
  border-left: 3px solid var(--clay);
  border-radius: 0 6px 6px 0;
  font-size: 14.5px;
  color: var(--ink);
  font-family: var(--serif);
  font-style: italic;
}

body.toc-page.pl-has-sidebar > main { padding-top: 40px; }

/* ═══════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════ */
@media (max-width: 680px) {
  header.lab-header { padding: 16px 20px; flex-wrap: wrap; gap: 8px; }
  main.lesson { padding: 28px 20px 80px; }
  h1.lesson-title { font-size: 28px; }
  .demo-stage { padding: 28px 24px; }
  .controls .control { grid-template-columns: 90px 1fr 58px; gap: 10px; }
  .lab-header .brand { font-size: 16px; }
  .line-widths { display: none; }
  .demo-stage.split { flex-direction: column; }
}