/* ==========================================================================
   crypto-sectors viz site — style.css
   Dark-mode only (v1.0). Light mode deferred to v1.1.
   Hand-written CSS, no preprocessor. All values on the 4px grid.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties (design tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Surfaces — dark mode (v1.0 dark-only) */
  --bg-0: hsl(220 18% 7%);
  --bg-1: hsl(220 16% 10%);
  --bg-2: hsl(220 14% 13%);
  --bg-3: hsl(220 12% 17%);

  /* Foreground */
  --fg-0: hsl(220 14% 96%);
  --fg-1: hsl(220 10% 74%);
  --fg-2: hsl(220 8% 54%);
  --fg-3: hsl(220 6% 36%);

  /* Accent — cyan 186deg (DESIGN-AMENDMENTS §1.1 override from 174deg) */
  --accent:       hsl(186 70% 58%);
  --accent-hover: hsl(186 70% 64%);
  --accent-muted: hsl(186 50% 40%);
  --accent-dim:   hsl(186 50% 40% / 0.18);

  /* Class colors */
  --class-10: hsl(36 78% 62%);    /* Digital Currencies — amber */
  --class-20: hsl(214 72% 64%);   /* Blockchain Infrastructure — steel blue */
  --class-30: hsl(286 56% 68%);   /* Digital Asset Applications — violet */
  --class-40: hsl(146 44% 56%);   /* On-Chain Derivatives — sage green */

  /* Semantic */
  --border:        hsl(220 12% 20%);
  --border-strong: hsl(220 12% 28%);
  --hover-bg:      hsl(220 14% 15%);
  --focus-ring:    hsl(186 70% 58% / 0.45);
  --success:       hsl(146 60% 52%);
  --warning:       hsl(36 82% 58%);
  --danger:        hsl(354 64% 60%);
  --chart-grid:    hsl(220 10% 22%);

  /* Typography */
  --font-ui:   'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, system-ui, sans-serif;
  --font-mono: 'Geist Mono', 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;

  /* Spacing (4px base unit) */
  --space-1:  4px;
  --space-2:  8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  /* Layout */
  --container-max:    1280px;
  --container-narrow: 720px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --header-height: 56px;

  /* Shadows */
  --shadow-md: 0 2px 8px hsl(220 30% 4% / 0.45), 0 0 0 1px hsl(220 12% 20%);
  --shadow-lg: 0 8px 24px hsl(220 30% 4% / 0.55), 0 0 0 1px hsl(220 12% 24%);

  /* Easing */
  --ease-out:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:   cubic-bezier(0.7, 0, 0.84, 0);
  --ease-zoom: cubic-bezier(0.32, 0.72, 0, 1);
  --ease-snap: cubic-bezier(0.85, 0, 0.15, 1);

  /* Sunburst geometry */
  --sb-size: 640px;
  --sb-inner-radius: 72px;
}

/* --------------------------------------------------------------------------
   2. Reset + base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 22px;
  color: var(--fg-0);
  background-color: var(--bg-0);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input {
  font-family: inherit;
}

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

/* --------------------------------------------------------------------------
   3. Accessibility utilities
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Global [hidden] override — any `display` value (flex/grid/block) wins
   over HTML5's default `[hidden] { display: none }` from the UA stylesheet,
   leaving JS-hidden elements stuck visible. This rule restores expected
   semantics for every element on the page (defensive — caught it 3 times
   in detail-row, detail-empty, and decision row). */
[hidden] { display: none !important; }

/* Focus ring — WCAG 2.4.13 compliant.
   Excludes <path> because Chrome renders both `outline` and `box-shadow` on
   SVG <path> as the path's bounding-box rectangle, which ignores the arc
   geometry of sunburst wedges. Paths get their own stroke-based focus ring
   in the dedicated rule below — the stroke follows the path geometry. */
:focus-visible:not(path) {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--focus-ring);
}

/* SVG path focus indicator (sunburst wedges) — stroke follows arc shape. */
path[role="button"] {
  outline: none !important;
  box-shadow: none !important;
}
path[role="button"]:focus,
path[role="button"]:focus-visible {
  outline: none !important;
  box-shadow: none !important;
  stroke: var(--accent);
  stroke-width: 2.5;
}

/* Focus not obscured — WCAG 2.4.11 */
:where(a, button, [tabindex], input, select, textarea, summary,
       [role="button"], [role="gridcell"]) {
  scroll-margin-top: calc(var(--header-height) + var(--space-4));
}

/* --------------------------------------------------------------------------
   4. Layout: Container
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

/* --------------------------------------------------------------------------
   5. Typography utilities
   -------------------------------------------------------------------------- */
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums slashed-zero;
}

.text-micro  { font-size: 11px; line-height: 14px; font-weight: 500; letter-spacing: 0.04em; }
.text-small  { font-size: 13px; line-height: 18px; font-weight: 400; }
.text-body   { font-size: 14px; line-height: 22px; font-weight: 400; }
.text-lead   { font-size: 16px; line-height: 24px; font-weight: 400; letter-spacing: -0.005em; }
.text-h2     { font-size: 22px; line-height: 28px; font-weight: 600; letter-spacing: -0.015em; }
.mono-display{ font-size: 28px; line-height: 32px; font-weight: 600; letter-spacing: -0.01em; }

/* --------------------------------------------------------------------------
   6. Header
   -------------------------------------------------------------------------- */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--bg-1);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
}

.header-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--fg-0);
  font-weight: 600;
  font-size: 14px;
}

.logo-link:hover { color: var(--accent); }

.logo-icon { color: var(--accent); flex-shrink: 0; }

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 13px;
  color: var(--fg-1);
  transition: color 80ms;
}

.nav-link:hover { color: var(--fg-0); }
.nav-link svg { flex-shrink: 0; }

/* --------------------------------------------------------------------------
   7. Hero section
   -------------------------------------------------------------------------- */
#hero {
  padding-block: var(--space-9);
  border-bottom: 1px solid var(--border);
}

.hero-content {
  max-width: 640px;
  margin-inline: auto;
  text-align: center;
}

#hero-title {
  font-size: 36px;
  line-height: 44px;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--fg-0);
  margin-bottom: var(--space-3);
}

.hero-lead {
  font-size: 16px;
  line-height: 24px;
  color: var(--fg-1);
  margin-bottom: var(--space-3);
}

.hero-meta {
  font-size: 13px;
  color: var(--fg-2);
  margin-bottom: var(--space-6);
}

.hero-meta .mono {
  font-size: 12px;
}

.hero-ctas {
  display: flex;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-5);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding-inline: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-1);
  background: transparent;
  transition: background-color 80ms, border-color 80ms, color 80ms;
}

.btn-ghost:hover {
  background-color: var(--bg-2);
  border-color: var(--border-strong);
  color: var(--fg-0);
}

/* --------------------------------------------------------------------------
   8. Search
   -------------------------------------------------------------------------- */
#search-container {
  position: relative;
  max-width: 480px;
  margin-inline: auto;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
  height: 48px;
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color 80ms;
}

.search-box:hover { border-color: var(--border-strong); }
.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-dim);
  outline: none;
}

.search-icon {
  position: absolute;
  left: var(--space-3);
  color: var(--fg-2);
  pointer-events: none;
  flex-shrink: 0;
}

.search-input {
  flex: 1;
  height: 100%;
  padding-inline: var(--space-3) var(--space-7);
  padding-left: 44px;
  background: transparent;
  border: none;
  outline: none;
  font-size: 16px; /* prevent iOS zoom */
  color: var(--fg-0);
  caret-color: var(--accent);
}

.search-input::placeholder { color: var(--fg-2); }
.search-input::-webkit-search-cancel-button { display: none; }

.search-clear {
  position: absolute;
  right: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  color: var(--fg-2);
  transition: color 80ms;
}

.search-clear:hover { color: var(--fg-0); }

.search-hint {
  position: absolute;
  right: var(--space-3);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-2);
  background-color: var(--bg-3);
  border-radius: var(--radius-sm);
  padding: 2px var(--space-1);
  pointer-events: none;
}

.search-input:not(:placeholder-shown) ~ .search-hint { display: none; }

.search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 200;
  background-color: var(--bg-2);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-height: 320px;
  overflow-y: auto;
  overflow-x: hidden;
}

.search-results[hidden] { display: none; }

.search-result-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: 40px;
  padding-inline: var(--space-3);
  cursor: pointer;
  transition: background-color 60ms;
  border-left: 2px solid transparent;
}

.search-result-item:hover,
.search-result-item[aria-selected="true"] {
  background-color: var(--hover-bg);
  border-left-color: var(--accent);
}

.search-result-symbol {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-0);
  min-width: 56px;
  flex-shrink: 0;
}

.search-result-name {
  font-size: 13px;
  color: var(--fg-1);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.search-result-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.class-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.code-chip {
  font-family: var(--font-mono);
  font-size: 11px;
  background-color: var(--bg-3);
  color: var(--fg-2);
  border-radius: var(--radius-sm);
  padding: 2px var(--space-1);
}

.search-result-no-results {
  padding: var(--space-4);
  font-size: 13px;
  color: var(--fg-2);
  text-align: center;
}

.search-result-more {
  padding: var(--space-2) var(--space-3);
  font-size: 11px;
  color: var(--fg-2);
  text-align: center;
  border-top: 1px solid var(--border);
}

mark {
  background-color: var(--accent-dim);
  color: var(--accent);
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   9. Sunburst section
   -------------------------------------------------------------------------- */
#sunburst-section {
  padding-block: var(--space-8);
  border-bottom: 1px solid var(--border);
}

.section-title {
  font-size: 22px;
  line-height: 28px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--fg-0);
  margin-bottom: var(--space-2);
}

.section-intro {
  font-size: 14px;
  color: var(--fg-1);
  margin-bottom: var(--space-6);
}

.sunburst-layout {
  display: grid;
  grid-template-columns: 640px 1fr;
  gap: var(--space-6);
  align-items: start;
}

.sunburst-wrap {
  flex-shrink: 0;
}

#sunburst-chart {
  background-color: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  width: 640px;
  height: 640px;
  position: relative;
}

#sunburst-svg {
  display: block;
}

/* Skeleton animation */
.skeleton-group circle {
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

@keyframes skeleton-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 0.8; }
}

/* Sunburst tooltip */
#sb-tooltip {
  position: fixed;
  z-index: 300;
  background-color: var(--bg-3);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  max-width: 280px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 120ms var(--ease-out);
}

#sb-tooltip.visible { opacity: 1; }

.tooltip-code {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-0);
}

.tooltip-name {
  font-size: 14px;
  color: var(--fg-0);
}

.tooltip-meta {
  font-size: 13px;
  color: var(--fg-2);
  margin-top: 4px;
}

/* Breadcrumb in donut hole */
.sb-breadcrumb {
  font-size: 11px;
  font-family: var(--font-mono);
  fill: var(--fg-1);
  text-anchor: middle;
  pointer-events: none;
}

.sb-back-btn {
  cursor: pointer;
  transition: fill 80ms;
}
.sb-back-btn:hover text { fill: var(--accent); }
.sb-back-btn rect { fill: transparent; }

/* Asset weight footnote */
.chart-footnote {
  font-size: 11px;
  color: var(--fg-3);
  margin-top: var(--space-2);
  text-align: center;
}

/* --------------------------------------------------------------------------
   10. Detail card
   -------------------------------------------------------------------------- */
#detail-card {
  /* v1.1.3: removed position:sticky — was causing the card to feel like
     it followed the scroll. The card now scrolls with the chart as a
     natural pair, which preserves the v1.0 hero pairing aesthetic. */
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  /* Match the sunburst chart height for visual symmetry across the hero. */
  min-height: 640px;
  max-height: 640px;
  overflow-y: auto;
  overflow-x: hidden;
}

/* v1.1.3: padded inner wrap so description and footer have breathing room */
.detail-body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-height: 100%;
}

/* Description paragraph — hero content above the classification table */
.detail-about {
  font-size: 14px;
  line-height: 22px;
  color: var(--fg-1);
  margin: 0;
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
}

/* Footer link — pushed to bottom of card by flex-grow on .detail-fields */
.detail-fields { flex-grow: 1; margin: 0; }

.detail-footer {
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
}

.detail-fullpage-link {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
}

.detail-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-7);
  height: 100%;
  min-height: 280px;
}

.detail-empty-label {
  font-size: 13px;
  color: var(--fg-1);
  font-weight: 500;
  margin: 0;
}

.detail-empty-hint {
  font-size: 12px;
  color: var(--fg-2);
  text-align: center;
  max-width: 240px;
  line-height: 1.5;
  margin: 0;
}

.detail-empty-hint .kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 1px 5px;
  border: 1px solid var(--border-1);
  border-radius: 3px;
  color: var(--fg-1);
  background: var(--bg-2);
}

.detail-class-stripe {
  height: 4px;
  width: 100%;
  flex-shrink: 0;
}

.detail-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: var(--space-5);
  padding-bottom: var(--space-3);
  gap: var(--space-3);
}

.detail-symbol {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 32px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg-0);
  flex-shrink: 0;
}

.detail-name {
  font-size: 14px;
  color: var(--fg-1);
  text-align: right;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.detail-fields {
  padding-inline: var(--space-5);
  padding-bottom: var(--space-5);
}

.detail-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: var(--space-2);
  align-items: baseline;
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--border);
}

.detail-row:last-child { border-bottom: none; }

.detail-row dt {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-2);
}

.detail-row dd {
  font-size: 14px;
  color: var(--fg-0);
  text-align: right;
}

.detail-row dd.mono {
  font-family: var(--font-mono);
  font-size: 13px;
}

.accent-link {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 80ms;
}
.accent-link:hover { color: var(--accent-hover); }

/* Detail card fade transition */
#detail-content {
  transition: opacity 180ms var(--ease-out);
}

#detail-content.fading { opacity: 0; }

/* --------------------------------------------------------------------------
   11. Heatmap section
   -------------------------------------------------------------------------- */
#heatmap-section {
  padding-block: var(--space-8);
  border-bottom: 1px solid var(--border);
}

.heatmap-wrap {
  background-color: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  overflow-x: auto;
  box-shadow: var(--shadow-md);
}

#heatmap-chart {
  min-width: 600px;
}

/* Heatmap tooltip */
#hm-tooltip {
  position: fixed;
  z-index: 300;
  background-color: var(--bg-3);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  max-width: 320px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 60ms var(--ease-out);
  font-size: 13px;
  color: var(--fg-1);
}

#hm-tooltip.visible { opacity: 1; }
.hm-tooltip-title { font-weight: 600; color: var(--fg-0); margin-bottom: var(--space-1); }
.hm-tooltip-assets { color: var(--fg-2); font-size: 12px; margin-top: 4px; }

/* --------------------------------------------------------------------------
   12. Validation section
   -------------------------------------------------------------------------- */
#validation-section {
  padding-block: var(--space-8);
  border-bottom: 1px solid var(--border);
}

.validation-card {
  background-color: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-7) var(--space-6);
  box-shadow: var(--shadow-md);
}

.validation-kpis {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.kpi-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.kpi-number {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 32px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg-0); /* neutral — DESIGN-AMENDMENTS §5.2 */
  font-variant-numeric: tabular-nums slashed-zero;
}

.kpi-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-2);
}

.kpi-caption {
  font-size: 13px;
  color: var(--fg-1);
  line-height: 18px;
}

.validation-cta {
  text-align: center;
  font-size: 14px;
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
}

.validation-subfooter {
  text-align: center;
  font-size: 11px;
  color: var(--fg-2);
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums slashed-zero;
}

/* --------------------------------------------------------------------------
   13. Footer
   -------------------------------------------------------------------------- */
#site-footer {
  padding-block: var(--space-6);
}

.footer-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-text {
  font-size: 12px;
  color: var(--fg-2);
  line-height: 18px;
}

.footer-link {
  color: var(--fg-2);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color 80ms;
}
.footer-link:hover { color: var(--fg-1); }

code {
  font-family: var(--font-mono);
  font-size: 11px;
  background-color: var(--bg-2);
  padding: 1px 4px;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   14. Touch target expansion (coarse pointer)
   -------------------------------------------------------------------------- */
@media (pointer: coarse) {
  .nav-link,
  .btn-ghost,
  .search-clear {
    min-height: 44px;
    min-width: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

/* --------------------------------------------------------------------------
   15. Responsive — tablet (<1024px)
   -------------------------------------------------------------------------- */
@media (max-width: 1023px) {
  #hero { padding-block: var(--space-7); }
  #hero-title { font-size: 28px; line-height: 34px; }
  #sunburst-section,
  #heatmap-section,
  #validation-section { padding-block: var(--space-7); }

  .sunburst-layout {
    grid-template-columns: 1fr;
  }

  #sunburst-chart {
    width: min(100%, 540px);
    height: min(100%, 540px);
    margin-inline: auto;
  }

  #sunburst-svg {
    width: 100%;
    height: 100%;
  }

  #detail-card {
    position: static;
    width: min(100%, 540px);
    margin-inline: auto;
  }

  .validation-kpis {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }
}

/* --------------------------------------------------------------------------
   16. Responsive — mobile (<640px)
   -------------------------------------------------------------------------- */
@media (max-width: 639px) {
  .container { padding-inline: var(--space-4); }
  #hero { padding-block: var(--space-6); }
  #hero-title { font-size: 28px; line-height: 34px; }
  #sunburst-section,
  #heatmap-section,
  #validation-section { padding-block: var(--space-6); }
  .header-nav .nav-link span { display: none; } /* icon only on mobile */

  /* Mobile bottom-sheet for detail card */
  #detail-card {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 60vh;
    overflow-y: auto;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    border-bottom: none;
    transform: translateY(100%);
    transition: transform 300ms ease;
    z-index: 200;
    /* Override the sticky positioning from desktop rule */
    top: auto;
    width: auto;
    margin-inline: 0;
  }

  #detail-card.sheet-open {
    transform: translateY(0);
  }

  #detail-card-close {
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    width: 44px;
    height: 44px;
    background: var(--bg-3, var(--bg-2));
    border: 1px solid var(--border);
    border-radius: 50%;
    font-size: 20px;
    color: var(--fg-1);
    cursor: pointer;
    z-index: 10;
  }

  #detail-card-close:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
}

/* Close button hidden by default on all widths (shown only via mobile media query above) */
.detail-card-close {
  display: none;
}

/* --------------------------------------------------------------------------
   17. Sunburst wedge styles (applied via D3 class/attr)
   -------------------------------------------------------------------------- */
.wedge-path {
  cursor: pointer;
  transition: fill-opacity 120ms;
}

.wedge-path.dimmed { fill-opacity: 0.3; }
.wedge-path.highlighted { fill-opacity: 1; }

/* SVG role="button" focus ring (keyboard nav for back-button and breadcrumb) */
g[role="button"]:focus-visible,
text[role="button"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Heatmap cell */
.hm-cell {
  cursor: pointer;
  rx: 3;
  transition: stroke-width 60ms;
}

.hm-cell:hover,
.hm-cell.active {
  stroke: var(--accent);
  stroke-width: 2px;
}

/* Heatmap row highlight */
.hm-row-highlight {
  stroke: var(--accent);
  stroke-width: 1px;
  fill: none;
}

/* ==========================================================================
   === Prose / MD rendered (QD-G, v1.1)
   Typography for pages generated by build_site.py:
   methodology, validation, decisions, per-asset coin pages.
   All values on the 4px grid; uses existing design tokens only.
   ========================================================================== */

.prose-page {
  padding-block: var(--space-8);
}

.prose-breadcrumb {
  font-size: 13px;
  color: var(--fg-2);
  margin-bottom: var(--space-5);
}

/* Prose container — max-width for long-form readability */
.prose {
  max-width: var(--container-narrow);
  margin-inline: auto;
  font-size: 15px;
  line-height: 24px;
  color: var(--fg-1);
}

.prose h1 {
  font-size: 28px;
  line-height: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg-0);
  margin-bottom: var(--space-5);
}

.prose h2 {
  font-size: 20px;
  line-height: 28px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--fg-0);
  margin-top: var(--space-7);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--border);
}

.prose h3 {
  font-size: 16px;
  line-height: 24px;
  font-weight: 600;
  color: var(--fg-0);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.prose h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg-0);
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

.prose p {
  margin-bottom: var(--space-4);
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 80ms;
}

.prose a:hover { color: var(--accent-hover); }

.prose strong { color: var(--fg-0); font-weight: 600; }
.prose em { font-style: italic; }

.prose ul,
.prose ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-5);
}

.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }

.prose li {
  margin-bottom: var(--space-2);
}

/* Prose tables */
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-bottom: var(--space-6);
  overflow-x: auto;
  display: block;
}

.prose thead th {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-2);
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border-strong);
  white-space: nowrap;
}

.prose tbody td {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border);
  color: var(--fg-1);
  vertical-align: top;
}

.prose tbody tr:last-child td { border-bottom: none; }
.prose tbody tr:hover td { background-color: var(--hover-bg); }

/* Prose code blocks */
.prose pre {
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  overflow-x: auto;
  margin-bottom: var(--space-5);
}

.prose pre code {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 20px;
  color: var(--fg-1);
  background: none;
  padding: 0;
  border-radius: 0;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 12px;
  background-color: var(--bg-2);
  padding: 2px 5px;
  border-radius: var(--radius-sm);
  color: var(--fg-0);
}

/* Blockquote */
.prose blockquote {
  border-left: 3px solid var(--accent-muted);
  margin-left: 0;
  padding-left: var(--space-4);
  color: var(--fg-2);
  font-style: italic;
  margin-bottom: var(--space-4);
}

/* TOC generated by python-markdown toc extension */
.prose .toc {
  background-color: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: var(--space-6);
  font-size: 13px;
}

.prose .toc ul { margin: 0; padding-left: var(--space-4); list-style: none; }
.prose .toc li { margin-bottom: 4px; }
.prose .toc a { color: var(--fg-2); text-decoration: none; }
.prose .toc a:hover { color: var(--accent); }

/* Permalink anchors from toc extension */
.prose .headerlink {
  display: inline-block;
  margin-left: var(--space-2);
  color: var(--fg-3);
  text-decoration: none;
  font-size: 13px;
  opacity: 0;
  transition: opacity 80ms;
}

.prose h2:hover .headerlink,
.prose h3:hover .headerlink { opacity: 1; }

/* Prose source link */
.prose-source-link {
  margin-top: var(--space-6);
  font-size: 13px;
}

/* ---- Coin page specific ---- */
.coin-header {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-1);
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-md);
}

.coin-class-stripe {
  height: 6px;
  width: 100%;
}

.coin-header-inner {
  padding: var(--space-5) var(--space-6);
}

.coin-header h1 {
  font-size: 28px;
  line-height: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg-0);
  margin-bottom: var(--space-3);
}

.coin-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.coin-section {
  background-color: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  margin-bottom: var(--space-5);
  box-shadow: var(--shadow-md);
}

.coin-section h2 {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg-0);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--border);
}

.coin-section p {
  font-size: 14px;
  line-height: 22px;
  color: var(--fg-1);
  margin-bottom: var(--space-3);
}

.coin-section p:last-child { margin-bottom: 0; }

.coin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.coin-table td {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.coin-table tr:last-child td { border-bottom: none; }
.coin-table td:first-child {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-2);
  white-space: nowrap;
  width: 140px;
}

.coin-section--links p { margin: 0; }

/* About row in detail card — multi-line text */
.dv-about-text {
  font-size: 12px !important;
  line-height: 18px !important;
  color: var(--fg-2) !important;
  text-align: left !important;
  white-space: normal !important;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
}

/* ==========================================================================
   === Legend panel ===
   Hierarchical class -> sector -> sub-sector -> assets sidebar.
   Layout decision: Option D — right column stacks legend (top) + detail
   card (bottom). Chart stays full 640px. Legend scrolls independently.
   On mobile (<1024px) the right column stacks below the chart via the
   existing single-column responsive rule; legend renders inline (no
   bottom-sheet), detail card stays bottom-sheet.
   ========================================================================== */

/* === Layout decision (v1.1.2, "live caption" rework) ===
   v1.1.1 had a collapsed <details> disclosure with a static full-tree
   legend. v1.1.2 turns it into a LIVE CAPTION that always reflects the
   sunburst's current view — in overview mode it lists the 4 classes
   (as a color key for the wedges); when zoomed it shows that
   sub-sector's name + asset chips. The panel mirrors the chart 1:1,
   no clicking required to read color meaning.
   ============================================== */

.sunburst-caption {
  margin-top: var(--space-6);
  background-color: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  /* Prevent stray horizontal scrollbar — content here should always wrap. */
  overflow-x: hidden;
}

.caption-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-3);
}

.caption-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-2);
}

.caption-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-2);
}

/* In overview mode: 4 class rows, each with color dot, name, count */
.caption-row {
  display: grid;
  grid-template-columns: 14px 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  margin-inline: calc(-1 * var(--space-3));
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 60ms;
}

.caption-row:hover {
  background-color: var(--bg-2);
}

.caption-row-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.caption-row-label {
  font-size: 14px;
  color: var(--fg-0);
}

.caption-row-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-2);
  font-variant-numeric: tabular-nums;
}

/* In zoomed mode: asset chips grid */
.caption-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-top: var(--space-2);
}

.caption-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-1);
  cursor: pointer;
  transition: all 80ms;
}

.caption-chip:hover {
  background-color: var(--bg-3);
  color: var(--fg-0);
  border-color: var(--accent);
}

.caption-chip.active {
  background-color: var(--accent-dim);
  border-color: var(--accent);
  color: var(--fg-0);
}

.caption-row.active {
  background-color: var(--accent-dim);
}

/* Filter input row */
.legend-filter-wrap {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.legend-filter-input {
  width: 100%;
  height: 32px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding-inline: var(--space-3);
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--fg-0);
  outline: none;
  caret-color: var(--accent);
  transition: border-color 80ms;
}

.legend-filter-input::placeholder { color: var(--fg-3); }
.legend-filter-input::-webkit-search-cancel-button { display: none; }
.legend-filter-input:focus { border-color: var(--accent); }

/* Scrollable legend tree body */
#legend-root {
  overflow-y: auto;
  max-height: 420px;
  padding-block: var(--space-1);
}

/* --- Class row --- */
.legend-class {
  border-bottom: 1px solid var(--border);
}

.legend-class:last-child {
  border-bottom: none;
}

.legend-class-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  user-select: none;
  transition: background-color 60ms;
}

.legend-class-header:hover {
  background-color: var(--hover-bg);
}

.legend-class-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.legend-class-name {
  flex: 1;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--fg-0);
  text-transform: uppercase;
}

.legend-class-count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  font-variant-numeric: tabular-nums;
}

.legend-class-chevron {
  width: 12px;
  height: 12px;
  flex-shrink: 0;
  color: var(--fg-3);
  transition: transform 120ms var(--ease-out);
}

.legend-class.collapsed .legend-class-chevron {
  transform: rotate(-90deg);
}

.legend-class-body {
  overflow: hidden;
}

.legend-class.collapsed .legend-class-body {
  display: none;
}

/* --- Sector row --- */
.legend-sector {
  border-top: 1px solid var(--border);
}

.legend-sector:first-child {
  border-top: none;
}

.legend-sector-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3) var(--space-1) var(--space-5);
  cursor: pointer;
  user-select: none;
  transition: background-color 60ms;
}

.legend-sector-header:hover {
  background-color: var(--hover-bg);
}

.legend-sector-code {
  font-family: var(--font-mono);
  font-size: 10px;
  background-color: var(--bg-3);
  color: var(--fg-2);
  border-radius: var(--radius-sm);
  padding: 1px var(--space-1);
  flex-shrink: 0;
}

.legend-sector-name {
  flex: 1;
  font-size: 12px;
  color: var(--fg-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.legend-sector-count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-3);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.legend-sector-chevron {
  width: 10px;
  height: 10px;
  flex-shrink: 0;
  color: var(--fg-3);
  transition: transform 120ms var(--ease-out);
}

.legend-sector.collapsed .legend-sector-chevron {
  transform: rotate(-90deg);
}

.legend-sector-body {
  padding: var(--space-1) var(--space-3) var(--space-2) var(--space-7);
}

.legend-sector.collapsed .legend-sector-body {
  display: none;
}

/* --- Sub-sector row --- */
.legend-subsector {
  margin-bottom: var(--space-1);
}

.legend-subsector-name {
  font-size: 11px;
  color: var(--fg-2);
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.legend-subsector-name .legend-sector-code {
  font-size: 9px;
}

/* Asset symbol tokens */
.legend-assets {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
}

.legend-asset-sym {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-1);
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1px var(--space-1);
  cursor: pointer;
  transition: background-color 60ms, border-color 60ms, color 60ms;
  line-height: 16px;
}

.legend-asset-sym:hover {
  background-color: var(--bg-3);
  border-color: var(--accent);
  color: var(--accent);
}

/* Highlighted / active states driven by JS */
.legend-asset-sym.legend-active {
  background-color: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.legend-class-header.legend-active,
.legend-sector-header.legend-active {
  background-color: var(--hover-bg);
}

.legend-class-header.legend-active .legend-class-name,
.legend-sector-header.legend-active .legend-sector-name {
  color: var(--accent);
}

/* Dimmed state (non-matching during hover/filter) */
.legend-asset-sym.legend-dim {
  opacity: 0.35;
}

.legend-class.legend-dim > .legend-class-header,
.legend-sector.legend-dim > .legend-sector-header {
  opacity: 0.4;
}

/* Focus rings */
.legend-class-header:focus-visible,
.legend-sector-header:focus-visible,
.legend-asset-sym:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* (Legacy .legend-mobile-toggle removed in v1.1.1 — <details> handles
   collapse natively across desktop and mobile, no JS toggle needed.) */

/* ---------- Responsive ---------- */
@media (max-width: 1023px) {
  #legend-root {
    max-height: 360px;
  }
}