/* ============================================================
   Kaiju — editorial research page (v3, light-first)
   Light palette is default; dark OS preference served via the
   @media (prefers-color-scheme: dark) block at the bottom.
   a11y: WCAG 2.2 AA text (4.5:1) + non-text (3:1) contrast,
         focus-visible rings, reduced-motion, aria-live DOM.
   ============================================================ */

:root {
  /* surfaces */
  --bg:        #F5F3F8;   /* page canvas — soft off-white */
  --bg-2:      #FFFFFF;   /* cards, panels, drawer, matrix wrap */
  --bg-3:      #EDE8F2;   /* hover / striped row / chart image bg */
  --surface:   #F0ECF5;

  /* ink — all ≥ 4.5:1 on --bg */
  --ink:       #0B0E14;   /* 17.3:1 — headings, wordmark, strong */
  --ink-2:     #2F3647;   /* 11.5:1 — body text */
  --ink-3:     #525A6E;   /*  7.0:1 — secondary labels */
  --muted:     #6A7286;   /*  4.8:1 — captions */
  --muted-2:   #8A90A0;   /*  3.5:1 — large-text-only */

  /* borders */
  --border:    #D5DAE2;   /* hairline on cards (decorative, ~1.5:1 on canvas) */
  --border-2:  #C8CDD8;   /* interactive resting border (3.1:1) */
  --border-3:  #8A90A0;   /* hover / focus (3.5:1) */

  /* elevation — cards pair a visible border with a soft drop shadow
     so they separate cleanly from the canvas. Dark mode overrides
     this to `none` since borders alone carry enough contrast there. */
  --card-shadow: 0 1px 2px rgba(15,20,35,0.05), 0 1px 1px rgba(15,20,35,0.03);

  /* accent — olive ink meets AA for text; bright lime returns as a
     decorative surface (no contrast requirement for pure decoration).
     Dark ink on bright lime still clears AA at ~13:1 so it doubles as
     a pass-tile fill. */
  --accent:        #CC00CC;   /* darker olive · 5.8:1 text */
  --accent-2:      #AA00AA;   /* hover / focus / pressed · 8.9:1 */
  --accent-bright: #EE00EE;   /* brand lime — decorative only */
  --accent-surface:rgba(238,0,238,0.10);   /* lime wash for cards + chips */
  --accent-on:     #FFFFFF;   /* ink on bright lime (13:1) */

  /* model semantic colors — split into ink + surface variants */
  --kimi:          #2A5CB8;   /* blue ink · 5.9:1 */
  --kimi-surface:  #E5EDFB;
  --nova:          #5C3FB3;   /* purple ink · 7.2:1 */
  --nova-surface:  #EEE4FB;

  /* pass / fail */
  --pass:          #0E8F4B;   /* green ink · 4.6:1 on white */
  --pass-surface:  #D4F4E1;
  --fail:          #B5171F;   /* red ink · 6.5:1 on white */
  --fail-surface:  #FDE1E1;

  /* warning — amber for medium-tier badges */
  --warning:       #A56B00;
  --warning-surface: #FFF3D6;

  /* diff tiers */
  --easy:      #6A7286;
  --medium:    #525A6E;
  --hard:      #5C3FB3;
  --expert:    #B5171F;

  /* focus ring (3:1 on every surface via darker olive) */
  /* Inner halo uses --bg-2 (card color) so the ring has a real
     separator whether it lands on page canvas or on a white card. */
  --focus-ring: 0 0 0 2px var(--bg-2), 0 0 0 4px var(--accent-2);

  /* motion — two Apple-style curves drive all transitions + GSAP */
  --ease-ui:   cubic-bezier(0.25, 0.1, 0.25, 1);     /* <200ms micros, hovers */
  --ease-out:  cubic-bezier(0.28, 0.11, 0.32, 1);    /* editorial entrances */
  --ease-in:   cubic-bezier(0.55, 0, 0.75, 0.25);    /* pulse tail only */
  --dur-xfast: 140ms;
  --dur-fast:  200ms;
  --dur-med:   400ms;
  --dur-slow:  640ms;

  /* type */
  --font-sans:    'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --font-display: 'Cormorant', Georgia, 'Times New Roman', serif;   /* editorial serif for wordmark, thesis, big reveal */

  /* scale — all meta/UI text raised to 14px floor */
  --s-wordmark: clamp(26px, 2.4vw, 34px);
  --s-thesis:   clamp(28px, 3.2vw, 44px);
  --s-reveal:   clamp(32px, 4.2vw, 56px);
  --s-h2:       28px;
  --s-h3:       20px;
  --s-body:     17px;
  --s-small:    15px;
  --s-ui:       14px;   /* new floor */
  --s-mono:     14px;

  --lh-body:   1.62;
  --ls-tight:  -0.02em;
  --ls-wide:   0.12em;
  --ls-badge:  0.20em;

  /* layout */
  --max-page:   1200px;
  --max-prose:  720px;
  --gap-section: 88px;
  --pad-x:       56px;
  --pad-x-mob:   20px;
  --hairline:    1px solid var(--border);
}

/* ---------- reset --------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; background: var(--bg); scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--s-body);
  line-height: var(--lh-body);
  color: var(--ink-2);
  /* Flat editorial canvas. Dark mode's own body rule (further down)
     restores the blue/purple radial glows. */
  background: var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Inter stylistic upgrades — ss01 alt g/a, cv11 curved l, cv05/08 for 1/4/6 */
  font-feature-settings: "ss01", "cv11", "cv05", "cv08";
}
/* Any mono / code numeric cell gets tabular figures. Catches .run-val,
   .matrix cells, .repo-score, funnel counters — anything that expects
   columns to align. */
code, .mono {
  font-variant-numeric: tabular-nums;
}
h1, h2, h3, h4, p, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }

/* Inline prose links get a subtle underline so they're visible on
   light canvas without collapsing the link color. Scoped to body
   copy only — structural links (card headers, tabs, resource cards,
   run IDs, matrix labels) keep their container styling. */
.prose a,
.phase-body a,
.section-desc a,
.teaser a,
.handoff a,
.caption a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: var(--border-2);
  transition: text-decoration-color var(--dur-xfast) var(--ease-ui), color var(--dur-xfast) var(--ease-ui);
}
.prose a:hover,
.phase-body a:hover,
.section-desc a:hover,
.teaser a:hover,
.handoff a:hover,
.caption a:hover {
  text-decoration-color: var(--accent);
  color: var(--ink);
}
button { font: inherit; color: inherit; background: transparent; border: 0; cursor: pointer; padding: 0; }
code, .mono { font-family: var(--font-mono); font-size: 0.92em; }
b, strong { font-weight: 600; color: var(--ink); }
em { font-style: italic; color: var(--ink); }
::selection { background: var(--accent); color: var(--accent-on); }

/* ---------- a11y utilities ------------------------------ */
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed;
  top: 8px; left: 8px;
  padding: 10px 14px;
  background: var(--accent);
  color: var(--accent-on);
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  font-weight: 500;
  z-index: 100;
  transform: translateY(-140%);
  transition: transform var(--dur-fast) var(--ease-ui);
}
.skip-link:focus { transform: translateY(0); outline: none; }

/* ---------- scroll progress rail --------------------------
   A thin gradient bar at the top of the viewport, fills
   left-to-right as the user scrolls. Written directly to
   `width` by kaiju_portal.js from inside a rAF loop,
   so it's paint-cheap and projector-friendly. */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-bright));
  z-index: 90;
  pointer-events: none;
  transform-origin: 0 0;
}
:root[data-theme="dark"] .scroll-progress,
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .scroll-progress {
    /* same gradient — olive ink + bright lime reads the same on both */
  }
}

/* GLOBAL focus — one ring to rule them all */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
select:focus-visible,
input:focus-visible,
[role="tab"]:focus-visible,
[tabindex]:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: 2px;
}

hr.rule {
  border: 0; height: 2px;
  background:
    linear-gradient(90deg,
      var(--accent-bright) 0,
      var(--accent-bright) 120px,
      var(--border) 120px,
      var(--border) 100%);
  margin: 22px 0;
}

/* ---------- page shell ---------------------------------- */
.page {
  max-width: var(--max-page);
  margin: 0 auto;
  padding: 40px var(--pad-x) 80px;
}
@media (max-width: 768px) {
  .page { padding: 28px var(--pad-x-mob) 56px; }
}

/* ---------- MASTHEAD ------------------------------------ */
.masthead { margin-bottom: 72px; }
.mast-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.wordmark {
  font-family: var(--font-display);   /* Fraunces */
  font-size: var(--s-wordmark);
  font-weight: 600;
  letter-spacing: 0;
  color: var(--ink);
}
.badge {
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  font-weight: 500;
  letter-spacing: var(--ls-badge);
  text-transform: uppercase;
  color: var(--accent);
  padding: 7px 14px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  white-space: nowrap;
}
.thesis {
  font-family: var(--font-display);   /* Fraunces */
  font-size: var(--s-thesis);
  line-height: 1.15;
  letter-spacing: var(--ls-tight);
  color: var(--ink);
  font-weight: 500;
  max-width: 860px;
  margin-top: 36px;
}
.thesis em {
  color: var(--accent);
  font-style: italic;
  font-weight: 500;
}
/* Word-wrapping spans inserted at runtime by the line-by-line
   thesis mask reveal. `<span class="thesis-word"><span class="thesis-word-inner">…</span></span>`
   The outer clips, the inner translates yPercent 110 → 0. */
.thesis-word {
  display: inline-block;
  overflow: hidden;
  vertical-align: baseline;
  line-height: inherit;
  padding: 0.1em 0 0.25em;
  margin: -0.1em 0 -0.25em;
}
.thesis-word-inner {
  display: inline-block;
  will-change: transform, opacity;
}
.thesis-em {
  color: var(--accent);
  font-style: italic;
}
.byline {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
}
.byline a { color: var(--ink-2); border-bottom: 1px solid var(--border-2); }
.byline a:hover { color: var(--ink); border-color: var(--ink-3); }

/* ---------- section shell ------------------------------- */
.section { margin-bottom: var(--gap-section); scroll-margin-top: 32px; }
.section:last-of-type { margin-bottom: 0; }
.section-label {
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: var(--hairline);
}
.section-desc {
  max-width: var(--max-prose);
  font-size: var(--s-small);
  color: var(--ink-2);
  margin-bottom: 28px;
}
.section-desc b { color: var(--ink); }

/* ---------- §01 prose + glance sidebar ------------------ */
.overview-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
  align-items: start;
}
@media (max-width: 900px) {
  .overview-grid { grid-template-columns: 1fr; gap: 28px; }
}

.prose {
  max-width: var(--max-prose);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-2);
}
.prose p + p { margin-top: 1em; }
.teaser {
  margin-top: 24px !important;
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: 0.04em;
  color: var(--ink-3);
}
.teaser a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
}
.teaser a:hover { background: color-mix(in oklab, var(--accent) 16%, transparent); }

.glance {
  border: var(--hairline);
  background: var(--bg-2);
  padding: 22px 22px 20px;
  position: relative;
  box-shadow: var(--card-shadow);
}
.glance::before {
  content: "";
  position: absolute;
  top: 0; left: 0; width: 3px; height: 100%;
  background: var(--accent);
}
.glance-label {
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: var(--hairline);
}
.glance-list { display: grid; gap: 10px; margin: 0; }
.glance-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
}
.glance-row dt {
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.glance-row dd {
  margin: 0;
  font-size: 13px;
  color: var(--ink-2);
  text-align: right;
}
.glance-row dd b {
  color: var(--accent);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.glance-foot {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
  font-size: 11px;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- §02 KPI cards ------------------------------- */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}
@media (max-width: 900px) {
  .kpi-row { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 500px) {
  .kpi-row { grid-template-columns: 1fr; }
}
.kpi-card {
  border: var(--hairline);
  background: var(--bg-2);
  padding: 20px 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 128px;
  transition:
    border-color var(--dur-fast) var(--ease-ui),
    background var(--dur-fast) var(--ease-ui),
    box-shadow var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out);
  box-shadow: var(--card-shadow);
}
.kpi-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 8px 24px rgba(15,20,35,0.12), 0 2px 6px rgba(15,20,35,0.08);
  transform: translateY(-2px);
}
.kpi-card--accent {
  border-left: 3px solid var(--accent-bright);
  background: linear-gradient(180deg, var(--accent-surface), color-mix(in oklab, var(--accent-surface) 30%, var(--bg-2)));
}
.kpi-label {
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
}
.kpi-value {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 4px;
}
.kpi-big {
  font-family: var(--font-display);   /* Fraunces — matches .reveal-big */
  font-size: clamp(32px, 3.4vw, 44px);
  font-weight: 500;
  color: var(--ink);
  letter-spacing: var(--ls-tight);
  line-height: 1;
  font-variant-numeric: tabular-nums lining-nums;
}
.kpi-big small {
  font-size: 0.55em;
  font-weight: 500;
  color: var(--ink-2);
  margin-left: 1px;
}
.kpi-num {
  font-family: var(--font-display);
  font-variant-numeric: tabular-nums lining-nums;
}
.kpi-card--accent .kpi-big { color: var(--accent); }
.kpi-suffix {
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  color: var(--ink-3);
  letter-spacing: 0.06em;
}
.kpi-sub {
  margin-top: auto;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.02em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ---------- §03 PIPELINE -------------------------------- */
/* Same left edge as other sections. The highlight lives in the
   inner pipeline-frame, not in an outer pull-out. */
.section-pipeline {
  position: relative;
}
.pipeline-frame {
  background:
    linear-gradient(180deg, color-mix(in oklab, var(--accent-bright) 18%, transparent), transparent 40%),
    var(--bg-2);
  border: var(--hairline);
  border-left: 3px solid var(--accent-bright);
  padding: 40px 36px 36px;
  box-shadow: var(--card-shadow);
}
@media (max-width: 768px) {
  .pipeline-frame { padding: 28px 20px; }
}

.pipeline-intro {
  max-width: 800px;
  margin-bottom: 44px;
}
.pipeline-eyebrow {
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.pipeline-title {
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.2;
  letter-spacing: var(--ls-tight);
  color: var(--ink);
  font-weight: 600;
  margin-bottom: 14px;
}
.pipeline-sub {
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 640px;
}

.pipeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: var(--hairline);
  margin-bottom: 32px;
  background: var(--bg);
  position: relative;
}

@media (max-width: 900px) {
  .pipeline { grid-template-columns: 1fr; }
  .phase { border-right: 0; border-bottom: var(--hairline); }
  .phase:last-child { border-bottom: 0; }
}

.phase {
  padding: 26px 22px 28px;
  border-right: var(--hairline);
  background: var(--bg);
  position: relative;
  transition: background var(--dur-fast) var(--ease-ui), border-color var(--dur-fast) var(--ease-ui);
}
.phase:last-child { border-right: 0; }
.phase:hover {
  background: color-mix(in oklab, var(--accent) 8%, transparent);
}

/* connector dot between phases */
.phase:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 38px;
  right: -5px;
  width: 9px;
  height: 9px;
  background: var(--bg);
  border: 1px solid var(--border-2);
  transform: rotate(45deg);
  z-index: 2;
}

@media (max-width: 900px) {
  .phase:not(:last-child)::after { display: none; }
}

.phase-label {
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.phase-title {
  font-size: var(--s-h3);
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.phase-body {
  display: grid;
  gap: 8px;
  font-size: var(--s-small);
  color: var(--ink-2);
  line-height: 1.55;
}
.phase-body li {
  padding-left: 14px;
  position: relative;
}
.phase-body li::before {
  content: "·";
  position: absolute; left: 0; top: -2px;
  font-family: var(--font-mono);
  color: var(--muted);
}

.handoff {
  margin-top: 24px;
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: 0.04em;
  color: var(--ink-3);
  text-align: right;
}
.handoff a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
}
.handoff a:hover { background: color-mix(in oklab, var(--accent) 16%, transparent); }

/* ---------- §04 REVEAL ---------------------------------- */
.section-reveal {
  padding-top: 8px;
}
.reveal {
  border-left: 3px solid var(--accent-bright);
  padding: 10px 0 10px 24px;
  margin-bottom: 40px;
  max-width: 960px;
}
.reveal-line {
  font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.45;
  color: var(--ink);
  letter-spacing: var(--ls-tight);
  font-weight: 400;
}
.reveal-line + .reveal-line { margin-top: 10px; }
.reveal-big {
  font-family: var(--font-display);   /* Fraunces */
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.reveal-kicker {
  color: var(--ink-2);
}
.reveal-kicker b { color: var(--ink); }
.reveal-cost {
  margin-top: 22px !important;
  font-size: var(--s-small);
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.reveal-cost b { color: var(--ink); font-weight: 500; }

/* ---------- §05 CHARTS ---------------------------------- */
.charts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}
/* 3-figure variant: all three charts in a single row. */
.charts-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
@media (max-width: 1080px) {
  .charts-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .charts-3 .chart--hero { grid-column: 1 / -1; }
}
@media (max-width: 768px) {
  .charts, .charts-3 { grid-template-columns: 1fr; gap: 16px; }
  .charts-3 .chart--hero { grid-column: auto; }
}
.chart {
  margin: 0;
  border: var(--hairline);
  background: var(--bg-2);
  padding: 14px;
  box-shadow: var(--card-shadow);
  min-width: 0;
}
.chart img {
  width: 100%;
  height: auto;
  display: block;
  background: var(--bg-2);
  min-height: 180px;
  object-fit: contain;
  border: 1px solid var(--border);
}
.chart--hero img {
  max-height: 280px;
}
.chart img.chart-dark { display: none; }
:root[data-theme="dark"] .chart img.chart-light { display: none; }
:root[data-theme="dark"] .chart img.chart-dark { display: block; }
:root[data-theme="light"] .chart img.chart-light { display: block; }
:root[data-theme="light"] .chart img.chart-dark { display: none; }
.chart figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
}
.caption {
  max-width: var(--max-prose);
  font-size: var(--s-small);
  color: var(--ink-2);
  line-height: 1.6;
}
.caption b { color: var(--ink); }
.caption a { color: var(--accent); border-bottom: 1px solid var(--border-2); }
.caption a:hover { border-color: var(--accent); }
.tok-kimi { color: var(--kimi); font-weight: 500; }
.tok-nova { color: var(--nova); font-weight: 500; }

/* ============================================================
   CHART TRIGGER + LIGHTBOX
   Chart <img> lives inside a <button class="chart-trigger"> so
   the click/keyboard target is the whole figure surface. A small
   "click to expand" hint fades in on hover/focus.
   ============================================================ */
.chart-trigger {
  display: block;
  width: 100%;
  padding: 0;
  margin: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
  position: relative;
  overflow: hidden;
  border-radius: 2px;
}
.chart-trigger img {
  transition: transform var(--dur-fast) var(--ease-out);
}
.chart-trigger:hover img,
.chart-trigger:focus-visible img {
  transform: scale(1.015);
}
.chart-zoom-hint {
  position: absolute;
  left: 50%;
  bottom: 10px;
  transform: translate(-50%, 6px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink);
  background: color-mix(in oklab, var(--bg-2) 92%, transparent);
  padding: 5px 10px;
  border: 1px solid var(--border-2);
  border-radius: 2px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-xfast) var(--ease-ui), transform var(--dur-xfast) var(--ease-ui);
}
.chart-trigger:hover .chart-zoom-hint,
.chart-trigger:focus-visible .chart-zoom-hint {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* Overlay — sits above everything including the drawer (z-index 60). */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  background: rgba(15, 20, 35, 0.78);
  opacity: 0;
  transition: opacity var(--dur-med) var(--ease-out);
}
.lightbox[data-open="true"] { opacity: 1; }
.lightbox[hidden] { display: none; }
:root[data-theme="dark"] .lightbox {
  background: rgba(0, 0, 0, 0.85);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .lightbox { background: rgba(0, 0, 0, 0.85); }
}

.lightbox-figure {
  margin: 0;
  max-width: min(1200px, 92vw);
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}
.lightbox-figure img,
#lightbox-img {
  display: block;
  width: auto;
  height: auto;
  max-width: 100%;
  max-height: calc(92vh - 60px);
  background: var(--bg-2);
  border: 1px solid var(--border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  object-fit: contain;
}
.lightbox-caption {
  color: #F3F5F9;   /* fixed light text — overlay is always dark */
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  line-height: 1;
  color: #F3F5F9;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--dur-xfast) var(--ease-ui), border-color var(--dur-xfast) var(--ease-ui), transform var(--dur-xfast) var(--ease-ui);
}
.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.5);
}
.lightbox-close:active { transform: scale(0.95); }

@media (max-width: 640px) {
  .lightbox { padding: 16px; }
  .lightbox-close { top: 12px; right: 12px; width: 36px; height: 36px; font-size: 20px; }
}

/* ---------- §06 RESOURCES ------------------------------- */
.resources {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (max-width: 768px) { .resources { grid-template-columns: 1fr; } }
.resource {
  position: relative;
  display: block;
  border: var(--hairline);
  padding: 28px;
  min-height: 160px;
  background: var(--bg-2);
  transition:
    border-color var(--dur-fast) var(--ease-ui),
    background var(--dur-fast) var(--ease-ui),
    color var(--dur-fast) var(--ease-ui),
    box-shadow var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out);
  box-shadow: var(--card-shadow);
}
.resource:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: 0 6px 16px rgba(15,20,35,0.08), 0 1px 2px rgba(15,20,35,0.04);
}
.res-label {
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 12px;
  transition: color var(--dur-fast) var(--ease-ui);
}
.resource:hover .res-label { color: var(--accent); }
.res-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 6px;
  transition: color var(--dur-fast) var(--ease-ui);
}
.resource:hover .res-title { color: var(--ink); }
.res-url {
  font-size: var(--s-ui);
  color: var(--ink-3);
  transition: color var(--dur-fast) var(--ease-ui);
}
.resource:hover .res-url { color: var(--ink-2); }
.res-arrow {
  position: absolute;
  top: 30px; right: 30px;
  font-size: 16px;
  color: var(--ink-3);
  transition: transform var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-ui);
}
.resource:hover .res-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

/* ============================================================
   §07 DATASET VIEWER — Kaiju-specific
   Flat editorial cards, no glassmorphism. Uses Tesseract tokens.
   Both prefixed (kj-) and unprefixed selectors for safety.
   ============================================================ */

/* ── viewer controls row ── */
.viewer-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.viewer-search {
  flex: 1;
  min-width: 200px;
  position: relative;
}
.viewer-search svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--ink-3);
  pointer-events: none;
}
.viewer-search input,
#viewer-search {
  width: 100%;
  padding: 10px 12px 10px 36px;
  font-size: var(--s-ui);
  font-family: var(--font-mono);
  border: var(--hairline);
  background: var(--bg-2);
  color: var(--ink);
  outline: none;
  transition: border-color var(--dur-fast) var(--ease-ui), box-shadow var(--dur-fast) var(--ease-ui);
}
.viewer-search input:focus,
#viewer-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-surface);
}
.viewer-search input::placeholder,
#viewer-search::placeholder {
  color: var(--ink-3);
}

.viewer-filters {
  display: flex;
  gap: 8px;
}
.viewer-filters select,
#viewer-difficulty,
#viewer-sort {
  padding: 10px 32px 10px 12px;
  font-size: var(--s-ui);
  font-family: var(--font-mono);
  border: var(--hairline);
  background: var(--bg-2);
  color: var(--ink);
  cursor: pointer;
  outline: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' fill='none' stroke='%23525A6E' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: border-color var(--dur-fast) var(--ease-ui);
}
.viewer-filters select:focus,
#viewer-difficulty:focus,
#viewer-sort:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-surface);
}

.viewer-meta,
#viewer-count {
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}

/* ── viewer table ── */
.matrix-wrap {
  border: var(--hairline);
  background: var(--bg-2);
  box-shadow: var(--card-shadow);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.viewer-table,
#viewer-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: var(--s-mono);
  table-layout: auto;
  min-width: 640px;
}
.viewer-table th,
.viewer-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  text-align: left;
}
.viewer-table thead th {
  font-weight: 500;
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
  background: var(--bg-3);
  border-bottom: 1px solid var(--border-2);
  position: sticky;
  top: 0;
  z-index: 2;
  user-select: none;
  white-space: nowrap;
}

/* column widths */
.th-instance { width: auto; min-width: 140px; }
.th-diff { width: 90px; text-align: center; white-space: nowrap; }
.th-tests { width: 80px; text-align: center; white-space: nowrap; }
.th-python { width: 100px; text-align: center; white-space: nowrap; }
.th-glm,
.th-nova { width: 22%; text-align: center; white-space: nowrap; }
.th-expand { width: 44px; text-align: center; cursor: default; }

.viewer-table tbody tr {
  cursor: pointer;
  transition: background var(--dur-xfast) var(--ease-ui);
}
.viewer-table tbody tr:hover {
  background: color-mix(in oklab, var(--accent) 6%, transparent);
}
.viewer-table tbody tr.row-expanded,
.viewer-table tbody tr.kj-row-expanded {
  background: var(--accent-surface);
}

/* ── diff badges — both prefixed and unprefixed ── */
.diff-badge,
.kj-diff-badge {
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid transparent;
}
.diff-easy,
.kj-diff-easy {
  background: var(--pass-surface);
  color: var(--pass);
  border-color: color-mix(in oklab, var(--pass) 30%, transparent);
}
.diff-medium,
.kj-diff-medium {
  background: var(--warning-surface);
  color: var(--warning);
  border-color: color-mix(in oklab, var(--warning) 30%, transparent);
}
.diff-hard,
.kj-diff-hard {
  background: var(--fail-surface);
  color: var(--fail);
  border-color: color-mix(in oklab, var(--fail) 30%, transparent);
}

/* ── pass rate bars — both prefixed and unprefixed ── */
.pass-rate-bar,
.kj-pass-rate-bar {
  display: flex;
  align-items: center;
  gap: 8px;
}
.pass-rate,
.kj-pass-rate {
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  min-width: 32px;
  text-align: right;
}
.pass-rate-track,
.kj-pass-rate-track {
  flex: 1;
  height: 4px;
  background: var(--border);
  overflow: hidden;
  min-width: 40px;
}
.pass-rate-fill,
.kj-pass-rate-fill {
  height: 100%;
  transition: width var(--dur-slow) var(--ease-out);
}
.pass-rate-fill-high,
.kj-pass-rate-fill-high { background: var(--pass); }
.pass-rate-fill-mid,
.kj-pass-rate-fill-mid { background: var(--warning); }
.pass-rate-fill-low,
.kj-pass-rate-fill-low { background: var(--fail); }
.pass-rate-fill-zero,
.kj-pass-rate-fill-zero { background: var(--muted); }

/* ── table cell helpers (kj- prefixed from JS) ── */
.kj-td-instance {
  color: var(--ink);
  font-size: 13px;
}
.kj-viewer-instance-name {
  display: block;
  color: var(--ink);
  font-weight: 400;
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.kj-viewer-repo-link {
  display: block;
  font-size: 11px;
  color: var(--ink-3);
  margin-top: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur-xfast) var(--ease-ui), border-color var(--dur-xfast) var(--ease-ui);
}
.kj-viewer-repo-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.kj-td-diff { text-align: center; }
.kj-td-tests {
  text-align: center;
  font-variant-numeric: tabular-nums;
  color: var(--ink-2);
}
.kj-td-python {
  text-align: center;
  font-size: 13px;
  color: var(--ink-3);
}
.kj-td-glm,
.kj-td-nova { text-align: center; }
.kj-td-expand { text-align: center; }

/* ── expand icon — both prefixed and unprefixed ── */
.expand-icon,
.kj-expand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  color: var(--ink-3);
  transition: transform var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-ui);
}
.expand-icon svg,
.kj-expand-icon svg {
  width: 14px;
  height: 14px;
}
.row-expanded .expand-icon,
.kj-row-expanded .kj-expand-icon,
.row-expanded .kj-expand-icon,
.kj-row-expanded .expand-icon {
  transform: rotate(90deg);
  color: var(--accent);
}

/* ── detail row (expanded) — both prefixed and unprefixed ── */
.detail-row td,
.kj-detail-row td {
  padding: 0;
  border-top: none;
  background: var(--bg-2);
}
.detail-content,
.kj-detail-content {
  padding: 20px 24px;
  animation: slideDown var(--dur-fast) var(--ease-out);
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.detail-grid,
.kj-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 768px) {
  .detail-grid,
  .kj-detail-grid { grid-template-columns: 1fr; }
}

.detail-block,
.kj-detail-block {
  background: var(--bg-2);
  border: var(--hairline);
  padding: 16px;
  box-shadow: var(--card-shadow);
}
.detail-block-title,
.kj-detail-block-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: var(--hairline);
}

.detail-row-item,
.kj-detail-row-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 5px 0;
  font-size: var(--s-ui);
  border-bottom: 1px solid var(--border);
}
.detail-row-item:last-child,
.kj-detail-row-item:last-child { border-bottom: none; }
.detail-key,
.kj-detail-key {
  font-family: var(--font-mono);
  color: var(--ink-3);
  letter-spacing: 0.02em;
}
.detail-val,
.kj-detail-val {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.detail-links,
.kj-detail-links {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.detail-link,
.kj-detail-link {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--accent);
  padding: 5px 12px;
  border: 1px solid color-mix(in oklab, var(--accent) 40%, transparent);
  transition: background var(--dur-xfast) var(--ease-ui), border-color var(--dur-xfast) var(--ease-ui), color var(--dur-xfast) var(--ease-ui);
}
.detail-link:hover,
.kj-detail-link:hover {
  background: var(--accent);
  color: var(--accent-on);
  border-color: var(--accent);
}

/* ── pagination — both prefixed and unprefixed ── */
.viewer-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 20px 0 0;
}
.page-btn,
.kj-page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 10px;
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  font-weight: 500;
  color: var(--ink-2);
  background: var(--bg-2);
  border: var(--hairline);
  cursor: pointer;
  transition: background var(--dur-xfast) var(--ease-ui), border-color var(--dur-xfast) var(--ease-ui), color var(--dur-xfast) var(--ease-ui);
}
.page-btn:hover,
.kj-page-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.page-btn:active,
.kj-page-btn:active {
  transform: scale(0.95);
}
.page-btn.page-active,
.kj-page-btn.kj-page-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-on);
  font-weight: 600;
}
.page-btn:disabled,
.kj-page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.page-ellipsis,
.kj-page-ellipsis {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  color: var(--ink-3);
}

/* ============================================================
   §08 QUALITY CARDS — Kaiju-specific
   Semantic color overrides on KPI cards for quality tiers.
   ============================================================ */

.quality-clean .kpi-big {
  color: var(--pass);
}
.quality-fixable .kpi-big {
  color: var(--warning);
}
.quality-degraded .kpi-big {
  color: var(--fail);
}
.quality-broken .kpi-big {
  color: var(--muted);
}

.quality-bar {
  width: 100%;
  height: 3px;
  background: var(--border);
  margin-top: 12px;
  overflow: hidden;
}
.quality-fill {
  height: 100%;
  transition: width var(--dur-slow) var(--ease-out);
}
.quality-clean .quality-fill { background: var(--pass); }
.quality-fixable .quality-fill { background: var(--warning); }
.quality-degraded .quality-fill { background: var(--fail); }
.quality-broken .quality-fill { background: var(--muted); }

/* ============================================================
   §09 CONFIDENCE STRIP — Kaiju-specific
   Flat card with border, no glassmorphism.
   ============================================================ */

.confidence-strip {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 24px 28px;
  border: var(--hairline);
  background: var(--bg-2);
  box-shadow: var(--card-shadow);
}

.confidence-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
}
.confidence-big {
  font-family: var(--font-display);
  font-size: clamp(32px, 3.4vw, 44px);
  font-weight: 500;
  color: var(--accent);
  line-height: 1;
  letter-spacing: var(--ls-tight);
  font-variant-numeric: tabular-nums lining-nums;
}
.confidence-lbl {
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 6px;
}

.confidence-right {
  flex: 1;
}
.confidence-range {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  color: var(--ink-3);
}
.confidence-track {
  flex: 1;
  height: 6px;
  background: var(--border);
  position: relative;
}
.confidence-marker {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-2);
  box-shadow: 0 0 0 1px var(--border-2);
  transition: left var(--dur-slow) var(--ease-out);
}

/* ---------- footer -------------------------------------- */
.foot {
  margin-top: var(--gap-section);
  padding-top: 26px;
  border-top: var(--hairline);
}
.foot-inner {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--s-ui);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  color: var(--ink-3);
}
.foot-inner a {
  color: var(--ink-2);
  border-bottom: 1px solid var(--border-2);
  transition: color var(--dur-xfast) var(--ease-ui), border-color var(--dur-xfast) var(--ease-ui);
}
.foot-inner a:hover {
  color: var(--ink);
  border-color: var(--accent);
}

/* ============================================================
   REDUCED MOTION — respect user preference.
   Every transform / opacity transition above is disabled here.
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .kpi-big, .kpi-num, .confidence-big {
    transition: none !important;
  }
}

/* ============================================================
   RESPONSIVE — Kaiju viewer
   ============================================================ */
@media (max-width: 768px) {
  .viewer-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .viewer-filters {
    flex-direction: column;
    width: 100%;
  }
  .viewer-filters select {
    width: 100%;
  }
  .confidence-strip {
    flex-direction: column;
    text-align: center;
    gap: 20px;
  }
  .confidence-range {
    flex-direction: column;
    gap: 8px;
  }
  .confidence-track {
    width: 100%;
  }
}
@media (max-width: 500px) {
  .th-python { display: none; }
  .viewer-table td:nth-child(5) { display: none; }
}

/* ============================================================
   DARK MODE
   Two activation paths:
   1. User toggle  — `:root[data-theme="dark"]` (explicit choice)
   2. OS fallback  — `:root:not([data-theme])` inside a
      `prefers-color-scheme: dark` query, so visitors who never
      click the toggle still get dark mode when their OS prefers it
   The mixin below re-declares tokens on both selectors.
   ============================================================ */
:root[data-theme="dark"],
:root[data-theme="dark"] body {
  color-scheme: dark;
}
:root[data-theme="dark"] {
  /* surfaces */
  --bg:        #0B0E14;
  --bg-2:      #151A28;
  --bg-3:      #1E2436;
  --surface:   #192030;

  /* no drop shadows in dark — borders alone carry separation */
  --card-shadow: none;

  /* ink */
  --ink:       #F3F5F9;
  --ink-2:     #C5CBE9;
  --ink-3:     #8B93B0;
  --muted:     #7A82A0;
  --muted-2:   #828898;   /* raised from 5E6374 for AA on 14px */

  /* borders */
  --border:    #2A3148;
  --border-2:  #3A4568;
  --border-3:  #4A5578;

  /* accent — original lime */
  --accent:          #EE00EE;
  --accent-2:        #FF44FF;
  --accent-bright:   #EE00EE;   /* same as --accent in dark */
  --accent-surface:  rgba(238,0,238,0.12);
  --accent-on:       #FFFFFF;

  /* model semantic colors */
  --kimi:            #89B5FF;
  --kimi-surface:    rgba(137,181,255,0.14);
  --nova:            #CDB0FF;
  --nova-surface:    rgba(205,176,255,0.14);

  /* pass / fail */
  --pass:            #5EE695;
  --pass-surface:    rgba(94,230,149,0.14);
  --fail:            #FF8F8F;
  --fail-surface:    rgba(255,143,143,0.12);

  /* warning */
  --warning:         #FFD666;
  --warning-surface: rgba(255,214,102,0.12);

  /* diff tiers */
  --easy:      #A1A7B6;
  --medium:    #DDE3EE;
  --hard:      #CDB0FF;
  --expert:    #FF8F8F;

  /* focus ring */
  --focus-ring: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
}

:root[data-theme="dark"] body {
  background:
    radial-gradient(ellipse 900px 520px at 20% -10%, rgba(137,181,255,0.05), transparent 60%),
    radial-gradient(ellipse 700px 420px at 120% 0%, rgba(205,176,255,0.04), transparent 60%),
    var(--bg);
}

:root[data-theme="dark"] .confidence-marker {
  box-shadow: 0 0 0 1px var(--border-2);
}

/* OS fallback — only applies when the user has NOT made an
   explicit choice via the toggle (no data-theme attribute). */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #0B0E14;  --bg-2: #151A28;  --bg-3: #1E2436;  --surface: #192030;
    --card-shadow: none;
    --ink: #F3F5F9;  --ink-2: #C5CBE9;  --ink-3: #8B93B0;
    --muted: #7A82A0;  --muted-2: #828898;
    --border: #2A3148;  --border-2: #3A4568;  --border-3: #4A5578;
    --accent: #EE00EE;  --accent-2: #FF44FF;  --accent-bright: #EE00EE;
    --accent-surface: rgba(238,0,238,0.12);  --accent-on: #FFFFFF;
    --kimi: #89B5FF;  --kimi-surface: rgba(137,181,255,0.14);
    --nova: #CDB0FF;  --nova-surface: rgba(205,176,255,0.14);
    --pass: #5EE695;  --pass-surface: rgba(94,230,149,0.14);
    --fail: #FF8F8F;  --fail-surface: rgba(255,143,143,0.12);
    --warning: #FFD666;  --warning-surface: rgba(255,214,102,0.12);
    --easy: #A1A7B6;  --medium: #DDE3EE;  --hard: #CDB0FF;  --expert: #FF8F8F;
    --focus-ring: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
    color-scheme: dark;
  }
  :root:not([data-theme]) body {
    background:
      radial-gradient(ellipse 900px 520px at 20% -10%, rgba(137,181,255,0.05), transparent 60%),
      radial-gradient(ellipse 700px 420px at 120% 0%, rgba(205,176,255,0.04), transparent 60%),
      var(--bg);
  }
  :root:not([data-theme]) .confidence-marker {
    box-shadow: 0 0 0 1px var(--border-2);
  }
  :root:not([data-theme]) .chart-light { display: none; }
  :root:not([data-theme]) .chart-dark { display: block; }
}

/* ============================================================
   THEME TOGGLE BUTTON
   Fixed top-right. Both palettes meet AA contrast.
   ============================================================ */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 50;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-2);
  border-radius: 999px;
  background: var(--bg-2);
  color: var(--ink-2);
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-ui), background var(--dur-fast) var(--ease-ui), transform var(--dur-fast) var(--ease-ui);
  box-shadow: 0 2px 8px rgba(15,20,35,0.06);
}
.theme-toggle:hover {
  border-color: var(--border-3);
  background: var(--bg-3);
}
.theme-toggle:active { transform: scale(0.95); }
.theme-toggle svg { width: 18px; height: 18px; display: block; }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle .icon-sun  { display: block; }
  :root:not([data-theme]) .theme-toggle .icon-moon { display: none; }
}
@media (max-width: 640px) {
  .theme-toggle { top: 12px; right: 12px; width: 36px; height: 36px; }
  .theme-toggle svg { width: 16px; height: 16px; }
}