/* ==========================================================================
   Lumen on bryanchen.net (/notebook/lumen/)

   Lumen 1.0's own stylesheet, fitted to the site: every rule is scoped to
   .lumen so nothing leaks into the site header or footer, the colours come
   from the site palette in ui/site.css (so the light/dark switch works), and
   the fonts are the site's Newsreader and Geist. Lumen's original header is
   replaced by the site header and the Notebook entry heading.
   ========================================================================== */

/* The page around the app: intro spacing as on the Growth Curve Analyzer, and
   without JavaScript the empty controls are hidden and a note shows instead. */
.lumen-intro { margin-block-start: clamp(1.5rem, 1rem + 2vw, 2.5rem); }
html:not(.js) .lumen { display: none; }
.lumen-nojs {
  margin-block-start: 2rem; padding: 1rem;
  border: 1px solid var(--rule); border-radius: var(--radius); color: var(--soft);
}

.lumen {
  /* Lumen's names, pointed at the site palette */
  --surface: var(--raised);
  --surface-soft: color-mix(in oklab, var(--raised), var(--ink) 6%);
  --ink-soft: var(--soft);
  --muted: var(--faint);
  --rule-dark: var(--faint);
  --serif: var(--font-display);
  --sans: var(--font-body);

  /* Lumen-only colours, light | dark (dark values in the blocks below) */
  --danger: #9A3F32;
  --band: #D2E7AD;      /* ideal emission passband: "green shading" in the caption */
  --ok-ink: #2A492B;  --ok-wash: #E7EFD9;  --ok-edge: #748D55;
  --bad-ink: #783C2E; --bad-wash: #F5E9E2; --bad-edge: #B68172;
  --lift: 0%;           /* protein and series colours are lightened this much in dark mode */

  margin-block-start: clamp(2rem, 1.5rem + 2vw, 3rem);
  color: var(--ink);
  font: 15px/1.6 var(--sans);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .lumen {
    --danger: #F2917F;
    --band: #557A2C;
    --ok-ink: #B9E0A0; --ok-wash: #1F2A1A; --ok-edge: #6E8F52;
    --bad-ink: #F2B3A4; --bad-wash: #33201B; --bad-edge: #9A6153;
    --lift: 20%;
  }
}
:root[data-theme="dark"] .lumen {
  --danger: #F2917F;
  --band: #557A2C;
  --ok-ink: #B9E0A0; --ok-wash: #1F2A1A; --ok-edge: #6E8F52;
  --bad-ink: #F2B3A4; --bad-wash: #33201B; --bad-edge: #9A6153;
  --lift: 20%;
}

/* The site reset leaves pages on content-box; Lumen was built for border-box
   (same fix as the Growth Curve Analyzer's .gc rule). */
.lumen, .lumen *, .lumen *::before, .lumen *::after { box-sizing: border-box; }
.lumen [hidden] { display: none !important; }
.lumen :is(button, input, select, textarea) { font: inherit; color: inherit; }
.lumen :is(button, select, input[type="range"], input[type="checkbox"]) { cursor: pointer; }
.lumen button { -webkit-tap-highlight-color: transparent; }
.lumen :is(button, input, select):disabled { cursor: not-allowed; opacity: .58; }
.lumen :is(h2, h3, p, dl) { margin: 0; }
.lumen :is(h2, h3) { font-family: var(--sans); font-weight: 500; text-wrap: balance; }
.lumen .section-title {
  font-family: var(--serif);
  font-size: clamp(34px, 4.6vw, 54px);
  line-height: 1.15;
  letter-spacing: -.03em;
}
.lumen h2 { font-size: 20px; line-height: 1.35; letter-spacing: -.025em; }
.lumen h3 { font-size: 17px; line-height: 1.45; letter-spacing: -.015em; }
.lumen p + p { margin-top: 12px; }
.lumen :is(small, .small) { font-size: 12px; line-height: 1.6; }
.lumen .muted { color: var(--muted); }

.lumen .main-nav { display: flex; align-items: stretch; gap: 30px; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.lumen .nav-button { position: relative; min-height: 57px; padding: 0 1px; border: 0; background: transparent; font-size: 12px; font-weight: 500; color: var(--muted); white-space: nowrap; }
.lumen .nav-button > span:first-child { margin-right: 8px; font-size: 10px; font-variant-numeric: tabular-nums; color: var(--muted); }
.lumen .nav-button::after { content: ""; position: absolute; height: 2px; left: 0; right: 0; bottom: -1px; background: transparent; }
.lumen .nav-button.active { color: var(--ink); font-weight: 650; }
.lumen .nav-button.active::after { background: var(--ink); }
.lumen .nav-button:hover { color: var(--ink); }
.lumen :is(.nav-button, .note-card):focus-visible { outline-offset: -2px; }
.lumen .count { margin-left: 7px; min-width: 19px; display: inline-flex; justify-content: center; padding: 0 5px; line-height: 19px; background: var(--surface-soft); border-radius: 6px; font-size: 10px; }
.lumen .section-heading { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; padding: 52px 0 38px; }
.lumen .eyebrow { font-family: var(--sans); font-size: 9px; font-weight: 700; letter-spacing: .17em; line-height: 1.6; text-transform: uppercase; }
.lumen .section-heading .eyebrow { margin-bottom: 16px; color: var(--ink-soft); }
.lumen .lede { max-width: 610px; margin-top: 18px; color: var(--ink-soft); font-size: 14px; line-height: 1.65; }
.lumen .heading-aside { display: flex; flex-direction: column; align-items: flex-start; width: 175px; flex-shrink: 0; padding-bottom: 4px; color: var(--ink-soft); }
.lumen .heading-aside p { font-size: 11px; line-height: 1.6; }
.lumen .large-symbol { display: block; margin-bottom: 14px; font-family: var(--serif); font-size: 46px; line-height: 1; color: var(--ink); }

/* The bench */
.lumen .bench-layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); gap: 22px; align-items: start; }
.lumen :is(.control-panel, .chart-panel, .result-card, .recall-panel, .note-editor) { border: 1px solid var(--rule); border-radius: var(--radius); background: var(--surface); }
.lumen .control-panel { padding: 24px 22px; }
.lumen .control-panel h2 { margin-bottom: 22px; font-size: 17px; }
.lumen .control-panel h2 + .small { margin: -11px 0 22px; }
.lumen label { display: block; font-size: 12px; font-weight: 550; line-height: 1.45; }
.lumen .control-panel > label { margin-top: 20px; margin-bottom: 8px; }
.lumen .control-panel h2 + label { margin-top: 0; }
.lumen select, .lumen textarea, .lumen input:not([type="range"]):not([type="checkbox"]):not([type="file"]) {
  width: 100%;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--rule-dark);
  border-radius: 7px;
  padding: 10px 11px;
  line-height: 1.4;
  font-size: 13px;
}
.lumen select { min-height: 42px; padding-right: 26px; }
.lumen textarea { resize: vertical; min-height: 170px; line-height: 1.8; }
.lumen :is(textarea, input)::placeholder { color: var(--muted); opacity: 1; }
.lumen .input-help { display: block; margin-top: 5px; font-size: 10px; color: var(--muted); }
.lumen .control-divider { border-top: 1px solid var(--rule); margin: 26px 0 0; }
.lumen .range-label { display: flex; align-items: baseline; flex-wrap: wrap; justify-content: space-between; gap: 4px 8px; }
.lumen .range-label output { color: var(--ink-soft); font-size: 11px; font-weight: 400; font-variant-numeric: tabular-nums; }
.lumen input[type="range"] { width: 100%; min-height: 25px; margin: 0; accent-color: var(--ink); }
.lumen input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--ink); margin: 0; flex-shrink: 0; }
.lumen .checkbox-row { display: flex; align-items: center; gap: 9px; min-height: 26px; }
.lumen .button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 10px 15px;
  border: 1px solid var(--rule-dark);
  border-radius: 7px;
  background: var(--surface);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
}
.lumen .button:hover { background: var(--surface-soft); border-color: var(--ink); }
.lumen .button.primary { border-color: var(--ink); background: var(--ink); color: var(--surface); }
.lumen .button.primary:hover { border-color: var(--accent); background: var(--accent); color: var(--on-accent); }
.lumen .control-panel .button { width: 100%; margin-top: 27px; justify-content: space-between; }
.lumen .control-panel .button + p { margin-top: 13px; font-size: 10px; }
.lumen .text-button { min-height: 35px; padding: 4px 0; background: transparent; border: 0; font-size: 11px; font-weight: 550; text-align: left; text-decoration: underline; text-decoration-color: var(--rule-dark); text-underline-offset: 4px; }
.lumen .text-button:hover { text-decoration-color: currentColor; }
.lumen .text-button.danger { color: var(--danger); }
.lumen .bench-main { display: grid; gap: 17px; min-width: 0; }
.lumen .chart-panel { position: relative; padding: 25px 25px 19px; overflow: hidden; }
.lumen .panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 21px; }
.lumen .panel-heading .eyebrow { color: var(--muted); font-size: 8px; margin-bottom: 6px; }
.lumen .tag { display: inline-flex; align-items: center; padding: 5px 9px; border: 1px solid var(--rule); border-radius: 5px; color: var(--ink-soft); background: var(--paper); font-size: 9px; line-height: 1.5; white-space: nowrap; }
.lumen .chart-host { min-width: 0; width: 100%; position: relative; }
.lumen .chart-host svg { display: block; width: 100%; height: auto; overflow: visible; }
.lumen .chart-legend { display: flex; align-items: center; flex-wrap: wrap; gap: 9px 20px; margin: 15px 0 10px; }
.lumen .legend-item { display: inline-flex; align-items: center; gap: 7px; font-size: 10px; color: var(--ink-soft); line-height: 1.5; }
.lumen .line-sample { display: inline-block; width: 21px; height: 0; border-top: 2px solid color-mix(in oklab, var(--protein-color, currentColor), #fff var(--lift)); flex-shrink: 0; }
.lumen .line-sample.dashed { border-top-style: dashed; }
.lumen .band-sample { display: inline-block; width: 17px; height: 10px; background: color-mix(in oklab, var(--band) 60%, var(--surface)); border: 1px solid var(--band); border-radius: 2px; }
.lumen .chart-caption { color: var(--muted); font-size: 10px; line-height: 1.6; }
.lumen .chart-panel > .chart-host + .chart-caption { margin-top: 12px; }
/* Chart parts drawn by app.js. CSS beats the SVG colour attributes, which stay as a fallback. */
.lumen .ax-grid { stroke: var(--rule); }
.lumen .ax-text { fill: var(--muted); }
.lumen .ax-label { fill: var(--ink-soft); }
.lumen .ax-laser { stroke: var(--ink); }
.lumen .ax-frame { stroke: var(--rule-dark); stroke-opacity: .5; }
.lumen .ax-band { fill: var(--band); }
.lumen .series { stroke: color-mix(in oklab, var(--protein-color), #fff var(--lift)); }
.lumen .compact { padding-top: 20px; }
.lumen .compact h2 { font-size: 16px; margin-bottom: 15px; }
.lumen .result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(145px, 1fr)); gap: 12px; }
.lumen .result-card { min-width: 0; padding: 17px 19px; }
.lumen .result-top { display: flex; align-items: center; gap: 7px; font-size: 11px; line-height: 1.4; color: var(--ink-soft); }
.lumen .result-top h3 { font-size: 12px; font-weight: 550; }
.lumen .protein-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: color-mix(in oklab, var(--protein-color, var(--ink)), #fff var(--lift)); flex-shrink: 0; vertical-align: 1px; margin-right: 4px; }
.lumen .result-top .protein-dot { margin: 0; }
.lumen .result-number { margin-top: 10px; font: 35px/1.1 var(--serif); letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.lumen .result-number > span { margin-left: 3px; font-size: 22px; }
.lumen .result-label { margin-top: 6px; font-size: 11px; font-weight: 600; line-height: 1.45; }
.lumen .result-detail { display: flex; justify-content: space-between; gap: 10px; margin-top: 7px; font-size: 10px; color: var(--muted); line-height: 1.6; }
.lumen .result-detail strong { flex-shrink: 0; color: var(--ink-soft); font-weight: 600; font-variant-numeric: tabular-nums; }
.lumen .insight-strip { display: flex; align-items: flex-start; gap: 12px; padding: 16px 19px; background: var(--tint); border: 1px solid color-mix(in oklab, var(--tint), var(--accent) 20%); border-radius: 9px; }
.lumen .insight-mark { display: grid; place-items: center; margin-top: 2px; width: 17px; height: 17px; border: 1px solid var(--ink-soft); border-radius: 50%; flex-shrink: 0; font: italic 12px/1 var(--serif); }
.lumen .insight-strip p { font-size: 11px; line-height: 1.7; }
.lumen .plot-tooltip { position: absolute; z-index: 4; right: 14px; top: 33px; max-width: min(230px, calc(100% - 65px)); padding: 9px 12px; background: var(--ink); color: var(--surface); border-radius: 7px; font-size: 11px; pointer-events: none; box-shadow: 0 4px 16px rgb(0 0 0 / .14); }

/* Reference material */
.lumen .library-section { margin-top: 42px; }
.lumen .library-section .panel-heading { margin-bottom: 12px; }
.lumen .library-section > p { max-width: 950px; font-size: 12px; }
.lumen .table-wrap { position: relative; margin-top: 20px; overflow-x: auto; border: 1px solid var(--rule); border-radius: 10px; background: var(--surface); }
.lumen table { width: 100%; border-collapse: collapse; text-align: left; font-size: 11px; white-space: nowrap; }
.lumen :is(th, td) { padding: 14px 17px; border-bottom: 1px solid var(--rule); }
.lumen th { background: var(--surface-soft); font-size: 10px; font-weight: 600; color: var(--ink-soft); }
.lumen tbody th { background: transparent; font-size: 11px; color: var(--ink); }
.lumen td { font-variant-numeric: tabular-nums; }
.lumen td:first-child { font-weight: 600; }
.lumen tbody tr:last-child :is(td, th) { border-bottom: 0; }
.lumen tbody tr:hover { background: color-mix(in oklab, var(--surface), var(--ink) 3%); }
.lumen td a { font-size: 10px; }
.lumen .method-details { margin-top: 27px; padding: 17px 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); font-size: 12px; color: var(--ink-soft); }
.lumen .method-details summary { cursor: pointer; font-weight: 600; color: var(--ink); line-height: 1.8; }
.lumen .method-details summary::marker { font-size: 10px; }
.lumen .method-details[open] summary { margin-bottom: 18px; }
.lumen .method-details p { max-width: 960px; }
.lumen .method-details :is(ul, ol) { padding-left: 20px; }
.lumen .method-details li + li { margin-top: 6px; }
.lumen :is(.method-details code, .model-formula) { font-family: var(--font-mono); font-size: 11px; }
.lumen .model-formula { margin: 14px 0; padding: 15px 18px; background: var(--surface-soft); border-left: 2px solid var(--accent); overflow-wrap: anywhere; }
.lumen .model-formula p { line-height: 1.8; }
.lumen .source-item { padding: 15px 0; border-bottom: 1px solid var(--rule); overflow-wrap: anywhere; }
.lumen .source-item:first-child { padding-top: 0; }
.lumen .source-item:last-child { border-bottom: 0; padding-bottom: 0; }
.lumen .source-item h3 { margin-bottom: 5px; font-size: 13px; font-weight: 600; }
.lumen .source-item p { margin-top: 5px; font-size: 11px; }
.lumen .source-item a { font-weight: 550; }

/* Reading and recall */
.lumen .learning-layout { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(280px, 1fr); gap: 32px; align-items: start; }
.lumen .subhead { margin-bottom: 22px; font-family: var(--serif); font-size: 26px; }
.lumen .reading-card { display: flex; align-items: flex-start; gap: 19px; padding: 25px 0; border-top: 1px solid var(--rule); }
.lumen .reading-card:first-child { padding-top: 21px; }
.lumen .reading-card:last-child { border-bottom: 1px solid var(--rule); }
.lumen .reading-number { display: grid; place-items: center; flex-shrink: 0; width: 33px; height: 33px; border: 1px solid var(--rule-dark); border-radius: 50%; font-size: 11px; font-variant-numeric: tabular-nums; }
.lumen .reading-content { min-width: 0; flex: 1; }
.lumen .reading-content h3 { margin-bottom: 8px; font-size: 17px; font-weight: 550; }
.lumen .reading-content p { font-size: 12px; line-height: 1.7; color: var(--ink-soft); }
.lumen .reading-meta { margin: 7px 0 10px; color: var(--muted); font-size: 10px; }
.lumen .reading-prompt { margin-top: 12px; padding: 11px 14px; border-left: 2px solid var(--accent); background: var(--surface-soft); font-size: 11px; color: var(--ink-soft); }
.lumen .reading-done { display: inline-flex; align-items: center; gap: 8px; margin-top: 15px; min-height: 28px; color: var(--ink-soft); font-size: 11px; font-weight: 400; }
.lumen .reading-card a { text-decoration-thickness: 1px; }
.lumen .recall-panel { padding: 27px; }
.lumen .recall-panel .eyebrow { margin-bottom: 10px; color: var(--ink-soft); }
.lumen .recall-panel h2 { font-family: var(--serif); font-size: 26px; }
.lumen #quiz-progress { margin: 16px 0 21px; font-size: 10px; letter-spacing: .015em; }
.lumen :is(#quiz h3, #quiz > p) { font-size: 15px; font-weight: 550; margin-bottom: 18px; line-height: 1.65; }
.lumen .quiz-choice { width: 100%; display: block; margin-top: 9px; padding: 13px 14px; border: 1px solid var(--rule); border-radius: 8px; background: transparent; text-align: left; font-size: 12px; line-height: 1.65; }
.lumen .quiz-choice:not(:disabled):hover { border-color: var(--rule-dark); background: var(--paper); }
.lumen .quiz-choice.selected { border-color: var(--ink); background: var(--tint); }
.lumen .quiz-choice.correct { border-color: var(--ok-edge); background: var(--ok-wash); color: var(--ok-ink); }
.lumen .quiz-choice.incorrect { border-color: var(--bad-edge); background: var(--bad-wash); color: var(--bad-ink); }
.lumen .quiz-choice:disabled { opacity: 1; }
.lumen .quiz-feedback { margin: 18px 0; font-size: 12px; color: var(--ink-soft); line-height: 1.75; }
.lumen .quiz-feedback p { margin-top: 8px; }
.lumen #quiz .button { margin-top: 20px; }
.lumen .quiz-navigation { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.lumen .quiz-navigation .text-button { margin-top: 20px; margin-left: auto; }
.lumen .glossary-section { margin-top: 48px; }
.lumen .glossary-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 30px; }
.lumen .glossary-item { padding: 20px 0; border-top: 1px solid var(--rule); }
.lumen .glossary-item dt { margin-bottom: 9px; font-size: 13px; font-weight: 600; }
.lumen .glossary-item dd { margin: 0; font-size: 12px; color: var(--ink-soft); line-height: 1.75; }

/* A notebook that belongs to the reader */
.lumen .notebook-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 14px; }
.lumen .notebook-toolbar #storage-status { margin-left: auto; font-size: 10px; }
.lumen .notebook-move { max-width: 640px; margin-bottom: 26px; font-size: 11px; }
.lumen .notebook-move strong { color: var(--ink-soft); font-weight: 600; }
.lumen .notebook-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 24px; align-items: start; min-height: 300px; }
.lumen .note-list { display: grid; gap: 10px; min-width: 0; }
.lumen .note-card { width: 100%; padding: 18px 19px; background: var(--surface); border: 1px solid var(--rule); border-radius: 9px; text-align: left; color: var(--ink); overflow-wrap: anywhere; }
.lumen .note-card:hover { border-color: var(--rule-dark); background: color-mix(in oklab, var(--surface), var(--ink) 3%); }
.lumen .note-card.selected { border-color: var(--accent); background: var(--tint); }
.lumen .note-card-title { display: block; margin-top: 6px; font-size: 13px; font-weight: 600; line-height: 1.5; }
.lumen .note-card-date { display: block; color: var(--muted); font-size: 10px; }
.lumen .note-card-context { display: block; margin-top: 6px; color: var(--ink-soft); font-size: 10px; line-height: 1.6; }
.lumen .note-editor { padding: 26px; }
.lumen .note-editor > label { margin-bottom: 9px; }
.lumen .note-editor input { font-size: 16px !important; }
.lumen .note-editor #note-context { margin: 12px 0 23px; }
.lumen .note-editor textarea { margin-bottom: 16px; }
.lumen .editor-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.lumen .editor-actions .danger { margin-left: auto; }
.lumen #note-saved-status { margin-top: 13px; font-size: 10px; }
.lumen .empty-state { padding: 29px 24px; border: 1px dashed var(--rule-dark); border-radius: 10px; color: var(--ink-soft); font-size: 12px; line-height: 1.8; }
.lumen :is(.empty-state h2, .empty-state h3) { color: var(--ink); margin-bottom: 11px; font-family: var(--serif); font-size: 24px; }
.lumen .empty-state .button { margin-top: 16px; }
.lumen .notebook-layout > .empty-state { grid-column: 1 / -1; }
.lumen #trash-list { display: grid; gap: 10px; margin-top: 18px; }
.lumen .trash-row { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 10px 0; border-bottom: 1px solid var(--rule); }
.lumen .trash-row > span { overflow-wrap: anywhere; min-width: 0; }
.lumen .trash-row .button { flex-shrink: 0; }
.lumen .trash-row:last-child { border-bottom: 0; }
.lumen #trash-list .note-card { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 16px; }
.lumen .app-footer { display: flex; align-items: center; flex-wrap: wrap; justify-content: space-between; gap: 15px; margin-top: 54px; padding: 24px 0 30px; border-top: 1px solid var(--rule); color: var(--ink-soft); font-size: 10px; }
.lumen .app-footer > span:first-child { font-weight: 600; }
.lumen .app-footer .muted { margin-left: 5px; font-weight: 400; }
.lumen .app-footer .text-button { font-size: 10px; min-height: 28px; }
.lumen #toast { position: fixed; z-index: 20; bottom: 25px; left: 50%; transform: translateX(-50%); width: max-content; max-width: calc(100% - 32px); padding: 13px 21px; border: 1px solid var(--ink); border-radius: 9px; background: var(--ink); color: var(--surface); font-size: 12px; line-height: 1.6; box-shadow: 0 6px 25px rgb(0 0 0 / .16); }

@media (min-width: 1500px) {
  .lumen .section-heading { padding-top: 61px; padding-bottom: 43px; }
}
@media (max-width: 1050px) {
  .lumen .heading-aside { width: 150px; }
  .lumen .bench-layout { grid-template-columns: 240px minmax(0, 1fr); gap: 18px; }
  .lumen .control-panel { padding: 22px 19px; }
  .lumen .chart-panel { padding: 23px 20px 18px; }
  .lumen .result-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lumen .learning-layout { gap: 24px; grid-template-columns: minmax(0, 1.25fr) minmax(275px, 1fr); }
  .lumen .recall-panel { padding: 23px; }
}
@media (max-width: 760px) {
  .lumen .main-nav { gap: 25px; overflow-x: auto; scrollbar-width: thin; padding-right: 2px; }
  .lumen .nav-button { min-height: 54px; font-size: 11px; flex-shrink: 0; }
  .lumen .section-heading { padding: 36px 0 27px; }
  .lumen .heading-aside { display: none; }
  .lumen .lede { font-size: 13px; margin-top: 15px; }
  .lumen .bench-layout { grid-template-columns: 1fr; }
  .lumen .control-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: 20px; align-items: start; }
  .lumen .control-panel > * { grid-column: 1 / -1; }
  .lumen .control-panel h2 { margin-bottom: 0; }
  .lumen .control-panel h2 + .small { margin-top: 11px; }
  .lumen .control-panel .button { margin-top: 22px; }
  .lumen .control-panel > label { margin-top: 16px; }
  .lumen .control-panel h2 + label { margin-top: 18px; }
  .lumen .control-divider { margin-top: 21px; }
  .lumen .chart-panel { padding: 21px 19px 18px; }
  .lumen .panel-heading { gap: 12px; margin-bottom: 19px; }
  .lumen .panel-heading h2 { font-size: 19px; }
  .lumen .tag { font-size: 8px; padding: 4px 7px; }
  .lumen .library-section { margin-top: 35px; }
  .lumen .library-section .panel-heading { align-items: flex-start; }
  .lumen .library-section .text-button { flex-shrink: 0; margin-top: 16px; font-size: 10px; }
  .lumen .learning-layout { grid-template-columns: 1fr; gap: 32px; }
  .lumen .recall-panel { max-width: none; }
  .lumen .glossary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 22px; }
  .lumen .notebook-layout { grid-template-columns: 220px minmax(0, 1fr); gap: 16px; }
  .lumen .notebook-toolbar #storage-status { margin-left: 0; width: 100%; margin-top: 3px; }
  .lumen .note-editor { padding: 20px; }
  .lumen .editor-actions { gap: 10px; }
  .lumen .editor-actions .danger { margin-left: 0; }
  .lumen .app-footer { margin-top: 38px; }
}
@media (min-width: 521px) and (max-width: 760px) {
  /* A compact control rail becomes two readable rows on tablets. */
  .lumen #bench .control-panel label[for="protein-a"] { grid-column: 1; grid-row: 2; }
  .lumen #bench .control-panel label[for="protein-b"] { grid-column: 2; grid-row: 2; }
  .lumen #protein-a { grid-column: 1; grid-row: 3; }
  .lumen #protein-b { grid-column: 2; grid-row: 3; }
}
@media (max-width: 520px) {
  .lumen .main-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 18px; row-gap: 0; overflow: visible; padding-right: 0; }
  .lumen .nav-button { min-width: 0; min-height: 45px; text-align: left; }
  .lumen .nav-button > span:first-child { margin-right: 5px; font-size: 9px; }
  .lumen .section-heading { padding: 31px 0 26px; }
  .lumen .section-heading .eyebrow { margin-bottom: 13px; font-size: 8px; }
  .lumen .section-title { font-size: clamp(32px, 8.9vw, 42px); line-height: 1.18; }
  .lumen .lede { max-width: 360px; }
  .lumen .control-panel { display: block; padding: 22px; }
  .lumen .chart-panel { padding: 19px 14px 16px; }
  .lumen .chart-panel .panel-heading { align-items: flex-start; }
  .lumen .chart-panel .tag { max-width: 112px; white-space: normal; text-align: center; }
  .lumen .chart-legend { gap: 8px 15px; margin-top: 12px; }
  .lumen .legend-item { font-size: 9px; }
  .lumen .chart-caption { font-size: 9px; }
  .lumen .result-grid { gap: 10px; }
  .lumen .result-card { padding: 15px; }
  .lumen .result-number { font-size: 32px; }
  .lumen .result-label { font-size: 10px; }
  .lumen .result-detail { font-size: 9px; }
  .lumen .insight-strip { gap: 10px; padding: 14px; }
  .lumen .insight-strip p { font-size: 10px; }
  .lumen .library-section .panel-heading { flex-wrap: wrap; gap: 5px; }
  .lumen .library-section .text-button { margin-top: 0; }
  .lumen .library-section > p { font-size: 11px; }
  .lumen :is(th, td) { padding: 12px 14px; }
  .lumen .reading-card { gap: 14px; padding: 22px 0; }
  .lumen .reading-content h3 { font-size: 16px; }
  .lumen .reading-number { width: 29px; height: 29px; }
  .lumen .glossary-grid { grid-template-columns: 1fr; }
  .lumen .glossary-section { margin-top: 36px; }
  .lumen .notebook-layout { grid-template-columns: 1fr; }
  .lumen .note-list { max-height: 330px; overflow-y: auto; padding: 3px; margin: -3px; }
  .lumen .notebook-toolbar { gap: 8px; }
  .lumen .notebook-toolbar .button { padding: 10px 12px; font-size: 11px; }
  .lumen .note-editor { padding: 19px; }
  .lumen .note-editor textarea { font-size: 14px; }
  .lumen .app-footer { align-items: flex-start; gap: 10px; padding: 22px 0; }
  .lumen .app-footer > span:nth-child(2) { flex-basis: 100%; order: 3; font-size: 9px; }
  .lumen .app-footer .text-button { min-height: 22px; padding-top: 0; }
}
@media print {
  /* ui/site.css already prints the light palette; reset Lumen's own colours to match. */
  .lumen, :root[data-theme="dark"] .lumen, :root:not([data-theme="light"]) .lumen {
    --danger: #9A3F32;
    --band: #D2E7AD;
    --ok-ink: #2A492B; --ok-wash: #E7EFD9; --ok-edge: #748D55;
    --bad-ink: #783C2E; --bad-wash: #F5E9E2; --bad-edge: #B68172;
    --lift: 0%;
    font-size: 10pt;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
  .lumen :is(.main-nav, .button, .text-button, #toast, .notebook-toolbar, .notebook-move) { display: none !important; }
  .lumen .section-heading { padding: 25px 0; }
  .lumen .section-title { font-size: 30pt; }
  .lumen .bench-layout { grid-template-columns: 180px minmax(0, 1fr); gap: 16px; }
  .lumen .control-panel { display: block; padding: 16px; }
  .lumen .control-panel > label { margin-top: 12px; }
  .lumen .control-panel select { border: 0; padding: 2px 0; min-height: 20px; appearance: none; }
  .lumen input[type="range"] { display: none; }
  .lumen .chart-panel { padding: 17px; }
  .lumen .result-card { padding: 13px; }
  .lumen .result-number { font-size: 25pt; }
  .lumen :is(.chart-panel, .result-card, .reading-card, .glossary-item, .note-card) { break-inside: avoid; }
  .lumen .table-wrap { overflow: visible; }
  .lumen table { white-space: normal; font-size: 8pt; }
  .lumen :is(th, td) { padding: 9px; }
  .lumen .method-details { break-inside: avoid; }
  .lumen .learning-layout { grid-template-columns: 1.3fr 1fr; gap: 20px; }
  .lumen .notebook-layout { grid-template-columns: 170px minmax(0, 1fr); }
  .lumen .note-list { max-height: none; overflow: visible; }
  .lumen .note-editor textarea { min-height: 260px; }
  .lumen .app-footer { margin-top: 25px; padding: 16px 0; }
}