/* ============================================================
   Learn Something New — Main Stylesheet
   "Museum monograph meets midnight observatory."
   ============================================================ */

:root {
  /* Palette (from SPEC) */
  --paper:        #f4ede0;
  --paper-deep:   #ebe1cf;
  --paper-warm:   #efe6d4;
  --ink:          #1a1410;
  --ink-soft:     #3d322a;
  --ink-mute:     #6b5d50;
  --accent:       #b8552e;
  --accent-deep:  #8a3a1a;
  --gold:         #b8923a;
  --gold-soft:    rgba(184, 146, 58, 0.55);
  --sage:         #6b7d5c;
  --dusk:         #2c3447;
  --rule:         rgba(26, 20, 16, 0.12);
  --rule-strong:  rgba(26, 20, 16, 0.22);

  /* Geometry */
  --reading-width: 680px;
  --frame-width:   1200px;
  --gutter:        clamp(1.25rem, 4vw, 3rem);

  --shadow-sm: 0 1px 2px rgba(40, 28, 18, 0.05);
  --shadow-card:
    0 1px 2px rgba(40, 28, 18, 0.05),
    0 12px 28px -14px rgba(40, 28, 18, 0.22),
    0 30px 60px -30px rgba(40, 28, 18, 0.18);
  --shadow-card-hover:
    0 2px 4px rgba(40, 28, 18, 0.06),
    0 22px 40px -16px rgba(40, 28, 18, 0.32),
    0 50px 80px -36px rgba(40, 28, 18, 0.28);
}

/* ---------- Reset / base ---------- */

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

html {
  background: var(--paper);
  color: var(--ink);
  scroll-behavior: smooth;
  /* Kill the grey/blue tap flash on iOS/Android over full-bleed card buttons */
  -webkit-tap-highlight-color: transparent;
}

body {
  min-height: 100dvh;
  background:
    radial-gradient(1200px 720px at 10% -10%, rgba(184, 146, 58, 0.06), transparent 60%),
    radial-gradient(900px 600px at 110% 10%, rgba(184, 85, 46, 0.05), transparent 65%),
    radial-gradient(800px 800px at 50% 120%, rgba(44, 52, 71, 0.05), transparent 70%),
    var(--paper);
  color: var(--ink);
  overflow-x: hidden;
  position: relative;
}

/* Subtle paper grain — pure CSS noise via layered radial gradients */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(rgba(26, 20, 16, 0.025) 1px, transparent 1px),
    radial-gradient(rgba(26, 20, 16, 0.018) 1px, transparent 1px);
  background-size: 3px 3px, 7px 7px;
  background-position: 0 0, 1px 2px;
  mix-blend-mode: multiply;
  opacity: 0.7;
}

/* Gentle page vignette — darkens the extreme edges so the warm paper feels
   lit from within, like a gallery wall. Kept very soft; multiply-blended. */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(140% 110% at 50% 42%, transparent 62%, rgba(40, 28, 18, 0.07) 100%);
  mix-blend-mode: multiply;
}
/* On the night scene the vignette deepens the blue toward the corners */
body[data-scene="cosmos"]::after {
  background:
    radial-gradient(140% 120% at 50% 38%, transparent 55%, rgba(10, 14, 26, 0.45) 100%);
}

#app {
  position: relative;
  z-index: 1;
  min-height: calc(100dvh - 6rem);
  padding: clamp(1.5rem, 4vw, 3rem) var(--gutter) clamp(2rem, 5vw, 4rem);
  /* Respect notch / rounded-corner safe areas (viewport-fit=cover) */
  padding-left: max(var(--gutter), env(safe-area-inset-left));
  padding-right: max(var(--gutter), env(safe-area-inset-right));
}
/* Programmatic focus lands on #app / headings (tabindex="-1") after each
   navigation — that's a "you are here" cue for screen readers, not a control,
   so suppress the visible focus ring there. Real controls keep their ring. */
[tabindex="-1"]:focus,
[tabindex="-1"]:focus-visible {
  outline: none;
  box-shadow: none;
}

/* ---------- Accessibility helpers ---------- */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  z-index: 100;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.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;
}

:focus-visible {
  outline: 2px solid var(--accent-deep);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Decorative elements ---------- */

.ornament {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.1rem;
  color: var(--gold);
  margin: 1.4rem auto;
  width: 100%;
  max-width: 360px;
}

.ornament .rule {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-soft), transparent);
}

.ornament .diamond {
  width: 8px;
  height: 8px;
  transform: rotate(45deg);
  background: var(--gold);
  opacity: 0.7;
  flex-shrink: 0;
}

.ornament .glyph {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--gold);
  opacity: 0.85;
  flex-shrink: 0;
  line-height: 1;
}

.ornament.is-large {
  max-width: 460px;
  margin: 2.4rem auto;
}
.ornament.is-large .glyph { font-size: 1.6rem; }

/* ---------- Site Footer ---------- */

.site-footer {
  position: relative;
  z-index: 1;
  padding: 2rem var(--gutter) calc(2.4rem + env(safe-area-inset-bottom, 0));
  text-align: center;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.site-footer .site-mark {
  font-weight: 600;
  color: var(--ink-soft);
}
.site-footer .site-dot {
  margin: 0 0.6rem;
  color: var(--gold);
}

/* ============================================================
   HOME SCREEN
   ============================================================ */

.home {
  max-width: var(--frame-width);
  margin: 0 auto;
}

.home-masthead {
  text-align: center;
  padding: clamp(2.5rem, 7vw, 6rem) 0 clamp(2.5rem, 5vw, 4rem);
}

.home-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.3rem;
  color: var(--ink-mute);
}
/* Flanking hairline ticks turn the deck line into a printed rubric */
.home-eyebrow::before,
.home-eyebrow::after {
  content: "";
  width: clamp(1.4rem, 5vw, 2.8rem);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-soft));
}
.home-eyebrow::after {
  background: linear-gradient(90deg, var(--gold-soft), transparent);
}

.home-title {
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.022em;
  color: var(--ink);
  margin: 0 auto;
  max-width: 14ch;
  text-wrap: balance;
}

.home-title .italic {
  font-style: italic;
  font-weight: 500;
  color: var(--accent-deep);
}

.home-subtitle {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.1rem, 1.8vw, 1.45rem);
  color: var(--ink-mute);
  margin: 1.4rem auto 0;
  max-width: 36ch;
  line-height: 1.45;
  text-wrap: balance;
}

/* ---------- Category Grid ---------- */

.cat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
  margin-top: 2rem;
}

@media (max-width: 1024px) {
  .cat-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
}
@media (max-width: 600px) {
  .cat-grid { grid-template-columns: 1fr; gap: 0.9rem; }
}

.cat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 220px;
  padding: 1.6rem 1.5rem 1.4rem;
  background: var(--paper-warm);
  border: 1px solid var(--rule);
  border-radius: 3px;
  cursor: pointer;
  color: var(--ink);
  text-align: left;
  font: inherit;
  text-decoration: none;
  overflow: hidden;
  box-shadow:
    var(--shadow-card),
    inset 0 1px 0 rgba(255, 252, 245, 0.45);
}

.cat-card::after {
  /* thin double-rule inside border */
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(26, 20, 16, 0.06);
  pointer-events: none;
  border-radius: 2px;
}

.cat-card::before {
  /* left accent tab */
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--tint, var(--accent));
  opacity: 0.85;
}

@media (hover: hover) and (pointer: fine) {
  .cat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--gold-soft);
  }

  .cat-card:hover .cat-name { color: var(--accent-deep); }
  .cat-card:hover .cat-glyph { color: var(--tint, var(--accent)); opacity: 1; transform: rotate(-6deg) scale(1.08); }
}

.cat-card .cat-glyph {
  position: absolute;
  top: 1.2rem;
  right: 1.3rem;
  font-size: 1.6rem;
  color: var(--tint, var(--ink-mute));
  opacity: 0.55;
  font-family: var(--font-display);
  line-height: 1;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base), color var(--dur-base);
}

.cat-card .cat-eyebrow {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 0.6rem;
}

.cat-card .cat-name {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0;
  overflow-wrap: break-word;
  transition: color var(--dur-base) var(--ease-out);
}

.cat-card .cat-blurb {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.02rem;
  color: var(--ink-mute);
  line-height: 1.35;
  margin: 0.8rem 0 0;
  text-wrap: balance;
}

.cat-card .cat-meta {
  margin-top: 1.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-ui);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.cat-card .cat-meta .arrow {
  color: var(--tint, var(--accent));
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0;
  transition: transform var(--dur-base) var(--ease-out);
}

.cat-card:hover .cat-meta .arrow { transform: translateX(4px); }

/* ---------- Surprise tile (spans 2, night-inverted) ---------- */

.cat-card.surprise {
  /* span 1 so 15 categories + Surprise = 16 fills the 4-col grid with no
     ragged orphan row; the dusk styling still makes it stand out */
  background: var(--dusk);
  color: var(--paper);
  border-color: rgba(244, 237, 224, 0.08);
  /* a faint moonlit top edge instead of the warm paper highlight */
  box-shadow:
    var(--shadow-card),
    inset 0 1px 0 rgba(244, 237, 224, 0.10);
}

.cat-card.surprise::after {
  border-color: rgba(244, 237, 224, 0.08);
}
.cat-card.surprise::before {
  background: var(--gold);
}

.cat-card.surprise .cat-eyebrow { color: rgba(244, 237, 224, 0.6); }
.cat-card.surprise .cat-name    { color: var(--paper); font-style: italic; font-size: 2rem; }
.cat-card.surprise .cat-blurb   { color: rgba(244, 237, 224, 0.72); font-size: 1.1rem; }
.cat-card.surprise .cat-meta    { color: rgba(244, 237, 224, 0.6); }
.cat-card.surprise .cat-meta .arrow { color: var(--gold); }
.cat-card.surprise .cat-glyph   { color: var(--gold); opacity: 0.85; font-size: 2rem; }

.cat-card.surprise:hover { border-color: var(--gold); }
.cat-card.surprise:hover .cat-name { color: var(--paper); }

@media (max-width: 600px) {
  .cat-card.surprise { grid-column: span 1; }
  .cat-card.surprise .cat-name { font-size: 2rem; }
}

/* Notice bar for missing data files */
.notice {
  margin: 2rem auto 0;
  max-width: var(--frame-width);
  padding: 0.85rem 1.1rem;
  background: rgba(184, 146, 58, 0.08);
  border: 1px solid var(--gold-soft);
  border-radius: 3px;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-align: center;
}

/* ---------- Lesson of the Day (home feature) ---------- */

.lesson-of-day {
  max-width: var(--frame-width);
  margin: 2.4rem auto 0;
}

.lod-card {
  position: relative;
  display: grid;
  grid-template-columns: clamp(120px, 16vw, 180px) 1fr;
  align-items: stretch;
  gap: clamp(1.2rem, 3vw, 2.4rem);
  width: 100%;
  padding: clamp(1.6rem, 3.5vw, 2.6rem) clamp(1.6rem, 3.5vw, 2.8rem);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(184, 146, 58, 0.13), transparent 58%),
    radial-gradient(90% 120% at 100% 100%, rgba(184, 85, 46, 0.05), transparent 60%),
    var(--paper-warm, var(--paper-deep));
  border: 1px solid var(--gold-soft);
  border-left: 3px solid var(--tint, var(--gold));
  border-radius: 4px;
  cursor: pointer;
  color: var(--ink);
  text-align: left;
  font: inherit;
  overflow: hidden;
  box-shadow:
    var(--shadow-card),
    inset 0 1px 0 rgba(255, 252, 245, 0.5);
  transition: transform var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}

.lod-card::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid rgba(184, 146, 58, 0.20);
  border-radius: 3px;
  pointer-events: none;
}

@media (hover: hover) and (pointer: fine) {
  .lod-card:hover {
    transform: translateY(-4px);
    border-color: var(--tint, var(--gold));
    box-shadow:
      var(--shadow-card-hover, 0 14px 40px rgba(26, 20, 16, 0.16)),
      inset 0 1px 0 rgba(255, 252, 245, 0.5);
  }
}
.lod-card:active { transform: translateY(-2px) scale(0.995); }

/* Left medallion: orbit rings + topic glyph */
.lod-aside {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--tint, var(--gold));
  min-height: 120px;
}
/* A soft gilt halo behind the glyph reads as a struck medallion, echoing the
   completion screen's lit centre — visual rhyme between start and finish. */
.lod-aside::before {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: clamp(78px, 11vw, 118px);
  height: clamp(78px, 11vw, 118px);
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(184, 146, 58, 0.16), transparent 70%);
  pointer-events: none;
}

.lod-orbit {
  position: absolute;
  inset: 0;
  margin: auto;
  width: clamp(108px, 15vw, 160px);
  height: clamp(108px, 15vw, 160px);
  opacity: 0.9;
}

.lod-orbit-dot {
  transform-origin: 60px 60px;
  animation: lod-orbit-spin 14s linear infinite;
}

@keyframes lod-orbit-spin {
  to { transform: rotate(360deg); }
}

.lod-glyph {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5vw, 3.6rem);
  line-height: 1;
  color: var(--tint, var(--accent));
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1);
}

@media (hover: hover) and (pointer: fine) {
  .lod-card:hover .lod-glyph { transform: rotate(-8deg) scale(1.08); }
}

.lod-main {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.lod-eyebrow {
  color: var(--accent-deep);
  margin-bottom: 0.5rem;
}

.lod-cat {
  font-family: var(--font-ui);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 0.35rem;
}

.lod-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -0.018em;
  color: var(--ink);
  margin: 0;
  text-wrap: balance;
}

.lod-card:hover .lod-title { color: var(--accent-deep); }

.lod-tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.05rem, 1.9vw, 1.3rem);
  color: var(--ink-soft);
  margin: 0.6rem 0 1rem;
  line-height: 1.4;
  max-width: 46ch;
  text-wrap: balance;
}

.lod-cta {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
  font-family: var(--font-ui);
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  color: var(--accent-deep);
}

.lod-cta-label { font-weight: 600; }

.lod-cta .arr {
  display: inline-block;
  transition: transform 0.35s cubic-bezier(0.2, 0.7, 0.2, 1);
}

@media (hover: hover) and (pointer: fine) {
  .lod-card:hover .lod-cta .arr { transform: translateX(5px); }
}

.lod-cta-meta {
  color: var(--ink-mute);
  letter-spacing: 0.06em;
}

.lod-cta-meta::before {
  content: "·";
  margin-right: 0.55rem;
  color: var(--rule);
}

@media (max-width: 600px) {
  .lod-card {
    grid-template-columns: 1fr;
    gap: 1rem;
    text-align: center;
    padding: 1.6rem 1.3rem;
  }
  .lod-aside { min-height: 96px; }
  .lod-main { align-items: center; }
  .lod-tagline { margin-left: auto; margin-right: auto; }
  .lod-cta { justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  .lod-orbit-dot { animation: none; }
}

/* ============================================================
   CATEGORY SCREEN (sub-grid of topics)
   ============================================================ */

.category-view {
  max-width: var(--frame-width);
  margin: 0 auto;
}

.cat-head {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: clamp(2rem, 5vw, 4rem) 0 1.5rem;
}

.cat-head .crumbs {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-ui);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 1.5rem;
}
.cat-head .crumbs button {
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0.5rem 0.4rem;
  margin: -0.5rem -0.4rem;   /* keep visual position; expand only the hit area */
  font: inherit;
  letter-spacing: inherit;
  color: var(--ink-mute);
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  touch-action: manipulation;
}
.cat-head .crumbs button:hover { color: var(--accent-deep); }
.cat-head .crumbs button:active { color: var(--accent); }
.cat-head .crumbs .sep { color: var(--gold); }

.cat-head .cat-head-glyph {
  font-family: var(--font-display);
  font-size: 2.4rem;
  color: var(--tint, var(--accent));
  margin-bottom: 0.6rem;
  line-height: 1;
}

.cat-head h1 {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5.5vw, 4.4rem);
  font-weight: 500;
  font-style: italic;
  letter-spacing: -0.018em;
  margin: 0;
  color: var(--ink);
}

.cat-head .cat-head-blurb {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.25rem;
  color: var(--ink-mute);
  margin-top: 0.9rem;
  max-width: 42ch;
  line-height: 1.45;
  text-wrap: balance;
}

.cat-head .cat-actions {
  display: flex;
  gap: 0.8rem;
  margin-top: 1.6rem;
  flex-wrap: wrap;
  justify-content: center;
}

/* ---------- Topic Grid ---------- */

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
  margin-top: 1.5rem;
}

@media (max-width: 900px) { .topic-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .topic-grid { grid-template-columns: 1fr; } }

.topic-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 240px;
  padding: 1.8rem 1.7rem 1.5rem;
  background: var(--paper-warm);
  border: 1px solid var(--rule);
  border-radius: 3px;
  cursor: pointer;
  color: var(--ink);
  text-align: left;
  font: inherit;
  overflow: hidden;
  box-shadow:
    var(--shadow-card),
    inset 0 1px 0 rgba(255, 252, 245, 0.45);
}

.topic-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--tint, var(--accent));
}

.topic-card::after {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(26, 20, 16, 0.05);
  pointer-events: none;
  border-radius: 2px;
}

@media (hover: hover) and (pointer: fine) {
  .topic-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--gold-soft);
  }
  .topic-card:hover .topic-title { color: var(--accent-deep); }
}

.topic-card .topic-eyebrow {
  font-family: var(--font-ui);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 0.7rem;
}

.topic-card .topic-glyph {
  position: absolute;
  top: 1.3rem;
  right: 1.5rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--tint, var(--ink-mute));
  opacity: 0.5;
  line-height: 1;
}

.topic-card .topic-title {
  font-family: var(--font-display);
  font-size: 1.85rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.08;
  margin: 0;
  color: var(--ink);
  transition: color var(--dur-base) var(--ease-out);
}

.topic-card .topic-tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--ink-soft);
  line-height: 1.4;
  margin: 0.8rem 0 0;
  text-wrap: balance;
}

.topic-card .topic-meta {
  margin-top: 1.3rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-ui);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.topic-card .topic-meta .arrow {
  color: var(--tint, var(--accent));
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0;
  transition: transform var(--dur-base) var(--ease-out);
}
.topic-card:hover .topic-meta .arrow { transform: translateX(4px); }

.topic-card .topic-meta .meta-time { color: var(--ink-soft); }

/* Topic glyph comes alive on hover */
.topic-card .topic-glyph {
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base), color var(--dur-base);
}
@media (hover: hover) and (pointer: fine) {
  .topic-card:hover .topic-glyph {
    color: var(--tint, var(--accent));
    opacity: 0.95;
    transform: rotate(-8deg) scale(1.12);
  }
}

/* Touch feedback: hover/tilt never fire on touch devices, so give a press
   state so a tapped card visibly responds before the transition begins. */
.cat-card, .topic-card { touch-action: manipulation; }
.cat-card:active, .topic-card:active {
  transform: translateY(-2px) scale(0.992);
  box-shadow: var(--shadow-card-hover);
}
.cat-card.surprise:active { transform: translateY(-2px) scale(0.992); }

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  max-width: 540px;
  margin: 2rem auto;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--ink-mute);
  font-size: 1.2rem;
  line-height: 1.6;
}

/* ============================================================
   READER SCREEN
   ============================================================ */

.reader {
  max-width: var(--reading-width);
  margin: 0 auto;
  padding: 1rem 0 2rem;
}

/* --- Scroll-progress hairline (thin top bar, decorative) --- */

.scroll-hairline {
  position: fixed;
  top: env(safe-area-inset-top, 0); left: 0; right: 0;
  height: 2px;
  z-index: 6;             /* above page-transition (5), below modals */
  background: transparent;
  pointer-events: none;
}
.scroll-hairline-fill {
  height: 100%;
  width: 100%;
  transform-origin: left center;
  transform: scaleX(var(--scroll-progress, 0));
  background: linear-gradient(90deg, var(--gold), var(--tint, var(--accent)));
  transition: transform 80ms linear;
}
body[data-scene="cosmos"] .scroll-hairline-fill {
  background: linear-gradient(90deg, var(--gold), var(--paper));
}

/* --- Top bar: crumbs + back + progress rail --- */

.reader-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2.4rem;
  gap: 1rem;
}

.reader-topbar .back-btn {
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0.6rem 0.6rem;
  margin-left: -0.6rem;       /* keep text flush-left; grow the hit area */
  font-family: var(--font-ui);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 44px;
  touch-action: manipulation;
}
.reader-topbar .back-btn:hover { color: var(--accent-deep); }
.reader-topbar .back-btn:active { color: var(--accent); }
.reader-topbar .back-btn .arr { color: var(--gold); font-size: 1rem; }

/* --- Progress thread (connected rail) --- */

.progress-rail {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
}

.progress-thread {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: 1;
  min-width: 120px;
  max-width: 260px;
  height: 16px;
}

/* The connecting line behind the dots */
.thread-track {
  position: absolute;
  left: 4px; right: 4px;
  top: 50%;
  height: 2px;
  transform: translateY(-50%);
  background: var(--rule-strong);
  border-radius: 2px;
  overflow: hidden;
}

/* Filled portion — width driven by --thread-progress (0..1) */
.thread-fill {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: calc(var(--thread-progress, 0) * 100%);
  background: linear-gradient(90deg, var(--gold), var(--tint, var(--accent)));
  border-radius: 2px;
  transform-origin: left center;
  animation: thread-fill-kf 560ms var(--ease-quill) both;
}

.rail-dot {
  position: relative;
  z-index: 1;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper-warm);
  border: 1px solid var(--rule-strong);
  flex-shrink: 0;
  transition: background var(--dur-base) var(--ease-out),
              border-color var(--dur-base),
              transform var(--dur-base);
}
.rail-dot .rail-dot-inner {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  opacity: 0;
  transform: scale(0.4);
  transition: opacity var(--dur-base), transform var(--dur-base);
}
.rail-dot.is-done {
  background: var(--gold);
  border-color: var(--gold);
}
.rail-dot.is-current {
  background: var(--tint, var(--accent));
  border-color: var(--tint, var(--accent));
  transform: scale(1.3);
}
.rail-dot.is-current .rail-dot-inner {
  opacity: 1;
  transform: scale(1);
  background: var(--tint, var(--accent));
  animation: dot-halo-kf 2.6s var(--ease-soft) infinite;
}

.rail-depth-label {
  font-family: var(--font-ui);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  white-space: nowrap;
  max-width: 22ch;
  overflow: hidden;
  text-overflow: ellipsis;
}
.rail-depth-label .rail-depth-num { color: var(--accent-deep); font-weight: 600; }

/* --- Header block --- */

.reader-header {
  margin-bottom: 2.2rem;
}

.reader-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.9rem;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.reader-eyebrow .dot {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--gold);
  display: inline-block;
}

.reader-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.reader-readtime {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--ink-mute);
}
.reader-readtime::before {
  content: "";
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--gold);
  display: inline-block;
}

.reader-cat-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.18rem 0.55rem;
  /* Tint the border for category identity, but keep the small text at a
     guaranteed-readable ink (some tints — e.g. gold, sage — fail AA as text). */
  border: 1px solid color-mix(in srgb, var(--tint, var(--accent)) 65%, var(--rule-strong));
  color: var(--ink-soft);
  border-radius: 999px;
  font-family: var(--font-ui);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.reader-title {
  font-family: var(--font-display);
  font-size: var(--fs-topic);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -0.018em;
  margin: 0.4rem 0 0.4rem;
  color: var(--ink);
  text-wrap: balance;
}

.reader-tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.3rem;
  color: var(--ink-mute);
  line-height: 1.4;
  margin: 0.4rem 0 0;
  max-width: 38ch;
  text-wrap: balance;
}

/* Old-style figures in the running prose are lovely, but the depth counter and
   read-time in the header should stay aligned lining numerals. */
.reader-eyebrow { font-feature-settings: "tnum" 1, "lnum" 1; }

.reader-level-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.3rem);
  font-weight: 600;
  font-style: italic;
  letter-spacing: -0.012em;
  line-height: 1.15;
  margin: 1.6rem 0 0.2rem;
  color: var(--ink);
  text-wrap: balance;
}

.reader-divider {
  margin: 1.6rem auto 2rem;
  max-width: 280px;
}

/* --- Body --- */

.reader-body {
  font-family: var(--font-body);
  font-size: 1.21rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.reader-body .prose-reveal:first-of-type p:first-of-type::first-letter,
.reader-body > p:first-of-type::first-letter {
  font-family: var(--font-display);
  font-size: 3.6em;
  font-weight: 600;
  float: left;
  line-height: 0.82;
  padding: 0.06em 0.12em 0 0;
  margin-right: 0.02em;
  color: var(--accent-deep);
  font-style: italic;
  /* small-caps on :first-line would otherwise shrink the cap — keep it grand */
  font-variant-caps: normal;
  text-shadow: 0 1px 0 rgba(255, 252, 245, 0.4);
}

/* The opening paragraph sits a hair larger and deeper in colour — the
   "lede" of a printed essay — so the page has an entry point before the
   measure settles to its even reading rhythm. */
.reader-body .prose-reveal:first-of-type p:first-of-type,
.reader-body > p:first-of-type {
  font-size: 1.04em;
  color: var(--ink);
}

.reader-body p { margin: 0 0 1.15em; }

/* Optical: the last paragraph of a level shouldn't crowd the finis ornament. */
.reader-body p:last-of-type { margin-bottom: 1.5em; }

/* --- Continue button --- */

.continue-row {
  margin: 3.2rem 0 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.btn-continue {
  appearance: none;
  border: 0;
  cursor: pointer;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-ui);
  font-size: 0.86rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  padding: 1.1rem 3.5rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-width: min(260px, 100%);
  max-width: 100%;
  justify-content: center;
  touch-action: manipulation;
  box-shadow:
    0 1px 2px rgba(26, 20, 16, 0.15),
    0 14px 28px -14px rgba(26, 20, 16, 0.45);
  transition: background var(--dur-base) var(--ease-out), transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-base);
}

.btn-continue:hover {
  background: var(--accent-deep);
  color: var(--paper);
}

.btn-continue:active { transform: translateY(1px); }

.btn-continue .arr {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0;
  opacity: 0.85;
}

.keyhint {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-ui);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.keyhint kbd {
  font-family: var(--font-mono);
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.1rem 0.45rem;
  font-size: 0.78rem;
  color: var(--ink-soft);
  box-shadow: 0 1px 0 rgba(26, 20, 16, 0.08);
}

/* Secondary smaller button */

.btn-ghost {
  appearance: none;
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--rule-strong);
  color: var(--ink-soft);
  font-family: var(--font-ui);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
  transition: border-color var(--dur-base), color var(--dur-base), background var(--dur-base), transform var(--dur-fast);
}
.btn-ghost:hover {
  border-color: var(--gold);
  color: var(--accent-deep);
  background: rgba(184, 146, 58, 0.06);
}
.btn-ghost:active { transform: scale(0.97); }

/* ============================================================
   COMPLETION SCREEN
   ============================================================ */

.complete {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
  padding: clamp(3rem, 8vw, 6rem) 0 2rem;
}

.complete-ornament {
  font-family: var(--font-display);
  font-size: 3.4rem;
  color: var(--gold);
  margin-bottom: 1.6rem;
  line-height: 1;
}

.complete-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--ink-mute);
  margin-bottom: 1rem;
}
/* Flanking gold ticks echo the home masthead eyebrow — a closing rubric that
   rhymes with the opening one, bookending the journey. */
.complete-eyebrow::before,
.complete-eyebrow::after {
  content: "";
  width: clamp(1.2rem, 4vw, 2.2rem);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-soft));
}
.complete-eyebrow::after {
  background: linear-gradient(90deg, var(--gold-soft), transparent);
}

.complete h1 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  letter-spacing: -0.018em;
  line-height: 1.04;
  color: var(--ink);
  margin: 0.4rem 0 1rem;
  text-wrap: balance;
}

.complete p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--ink-mute);
  margin: 0 auto 2rem;
  max-width: 38ch;
  text-wrap: balance;
}

.complete .actions {
  display: flex;
  gap: 0.9rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.6rem;
}

.complete .actions .btn-solid {
  appearance: none;
  cursor: pointer;
  border: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 0.95rem 1.8rem;
  border-radius: 999px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
  transition: background var(--dur-base), transform var(--dur-fast);
}
.complete .actions .btn-solid:hover { background: var(--accent-deep); }
.complete .actions .btn-solid:active { transform: scale(0.97); }

.complete .actions .btn-ghost-solid {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--rule-strong);
}
.complete .actions .btn-ghost-solid:hover {
  background: rgba(184, 146, 58, 0.06);
  border-color: var(--gold);
  color: var(--accent-deep);
}

/* ============================================================
   AMBIENT CANVAS + PAGE TRANSITION OVERLAY
   ============================================================ */

#ambient {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100dvh;      /* dvh avoids the iOS toolbar-collapse jump that 100vh causes */
  z-index: 0;          /* behind body::before (which is also 0), but pointer-events none */
  pointer-events: none;
  opacity: 0.22;
  mix-blend-mode: multiply;
}

/* On the dusk-themed cosmos scene, blend the constellation in luminance mode */
body[data-scene="cosmos"] #ambient {
  opacity: 0.5;
  mix-blend-mode: screen;
}

#page-transition {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 5;
  overflow: hidden;
}
#page-transition::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0;
  left: -40%;
  width: 40%;
  background: linear-gradient(
    100deg,
    transparent 0%,
    color-mix(in srgb, var(--tint, var(--gold)) 22%, transparent) 50%,
    transparent 100%
  );
  transform: translateX(-100%);
  opacity: 0;
}

/* ============================================================
   HERO ORRERY (homepage masthead backdrop)
   ============================================================ */

.home-masthead {
  position: relative;
  overflow: visible;
}

.home-masthead .masthead-inner {
  position: relative;
  z-index: 2;
}

.hero-orrery {
  position: absolute;
  top: 50%;
  left: 50%;
  width: clamp(520px, 90vw, 820px);
  height: clamp(520px, 90vw, 820px);
  transform: translate(-50%, -50%);
  z-index: 0;
  opacity: 0.22;
  color: var(--ink-soft);
  pointer-events: none;
}
.hero-orrery img,
.hero-orrery svg {
  width: 100%;
  height: 100%;
  display: block;
  color: inherit;
}

/* On dusk scene the orrery glows gold against the night */
body[data-scene="cosmos"] .hero-orrery {
  opacity: 0.28;
  color: var(--gold);
}

@media (max-width: 700px) {
  .hero-orrery { opacity: 0.16; }
}

/* ============================================================
   CATEGORY CARD ILLUSTRATIONS
   ============================================================ */

.cat-card {
  /* Make room for the illustration above the text block */
  min-height: 320px;
  padding-top: 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.cat-illus {
  position: relative;
  width: calc(100% + 3rem);
  margin: 0 -1.5rem 1rem;
  height: 130px;
  padding: 0.6rem 1.2rem 0;
  overflow: hidden;
  color: var(--tint, var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(180deg, rgba(184, 146, 58, 0.06), transparent 70%);
  border-bottom: 1px solid var(--rule);
}
/* Gilt hairline riding the bottom of the illustration shelf — warms the seam
   between picture and caption. */
.cat-illus::after {
  content: "";
  position: absolute;
  left: 1.2rem; right: 1.2rem; bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-soft), transparent);
  opacity: 0.6;
  transition: opacity var(--dur-base) var(--ease-out);
}
.cat-illus img,
.cat-illus svg {
  width: 92%;
  max-width: 280px;
  height: 100%;
  object-fit: contain;
  display: block;
  color: var(--tint, var(--accent));
  transition:
    transform 600ms var(--ease-quill),
    filter 400ms var(--ease-out),
    opacity 600ms var(--ease-quill);
}

@media (hover: hover) and (pointer: fine) {
  .cat-card:hover .cat-illus img,
  .cat-card:hover .cat-illus svg {
    transform: scale(1.04) translateY(-2px);
    filter: brightness(1.06);
  }
  .cat-card:hover .cat-illus::after { opacity: 1; }
}

.cat-card .cat-body {
  padding: 0 0 0.4rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-width: 0;   /* let long titles wrap instead of forcing card overflow */
}

/* Re-anchor the glyph above the illustration row */
.cat-card .cat-glyph {
  top: 0.85rem;
  right: 0.95rem;
  z-index: 2;
}

/* Hover bloom: gold accent rule glows, paths brighten */
@media (hover: hover) and (pointer: fine) {
  .cat-card:hover {
    transform: translateY(-6px);
  }
  .cat-card:hover::before {
    box-shadow: 0 0 12px var(--gold-soft);
    opacity: 1;
  }
  .cat-card:hover .cat-illus {
    background:
      linear-gradient(180deg, rgba(184, 146, 58, 0.12), transparent 70%);
  }
}

/* ---------- Pointer-tracked tilt + accent bloom (desktop fine-pointer) ---------- */

.card-tilt {
  /* default values so the calc() never breaks before JS sets them */
  --mx: 0.5;
  --my: 0.5;
  --tilt-active: 0;
  transform-style: preserve-3d;
  will-change: transform;
}

/* Pointer bloom: a soft radial highlight that follows the cursor.
   Driven via background-image so it composites over the solid background-color. */
.card-tilt {
  background-image:
    radial-gradient(
      260px circle at calc(var(--mx) * 100%) calc(var(--my) * 100%),
      rgba(184, 146, 58, calc(0.10 * var(--tilt-active))),
      transparent 60%
    );
  background-repeat: no-repeat;
}

/* Surprise tile uses a background shorthand (image); opt it out of the bloom
   to avoid double-painting. It gets its life from the dice glyph (C8) instead. */
.cat-card.surprise.card-tilt { background-image: none; }

@media (hover: hover) and (pointer: fine) {
  .card-tilt {
    transition: transform var(--dur-base) var(--ease-out),
                box-shadow var(--dur-base) var(--ease-out),
                border-color var(--dur-base) var(--ease-out);
  }
  .card-tilt:hover {
    transform:
      translateY(-6px)
      perspective(900px)
      rotateX(calc((var(--my) - 0.5) * -5deg))
      rotateY(calc((var(--mx) - 0.5) * 5deg));
  }
}

/* ---------- Surprise tile (night dusk + stars) ---------- */

.cat-card.surprise {
  background:
    radial-gradient(140% 80% at 80% -10%,
      rgba(184, 146, 58, 0.32) 0%,
      rgba(184, 146, 58, 0.06) 22%,
      transparent 50%),
    radial-gradient(70% 50% at 20% 110%,
      rgba(244, 237, 224, 0.05) 0%,
      transparent 60%),
    var(--dusk);
  overflow: hidden;
}

.cat-card.surprise .surprise-stars {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  color: var(--paper);
  pointer-events: none;
  opacity: 0.85;
}

/* On surprise, suppress the illus shelf (we use stars instead) */
.cat-card.surprise .cat-illus { display: none; }
.cat-card.surprise { grid-template-rows: 1fr auto; }

/* ---------- Mobile: simpler card layout ---------- */

@media (max-width: 600px) {
  .cat-card { min-height: 280px; }
  .cat-illus { height: 110px; }
}

/* ============================================================
   CATEGORY HEAD ILLUSTRATION
   ============================================================ */

.cat-head-illus {
  width: clamp(220px, 36vw, 360px);
  height: clamp(150px, 24vw, 220px);
  color: var(--tint, var(--accent));
  margin: 0.4rem auto 0.6rem;
  opacity: 0.85;
}
.cat-head-illus img,
.cat-head-illus svg {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  color: var(--tint, var(--accent));
}

/* ============================================================
   READER DECORATIONS
   ============================================================ */

.reader-body {
  position: relative;
}

.drop-ornament {
  display: block;
  width: 22px;
  height: 22px;
  color: var(--gold);
  margin: 0 0 0.6rem;
  opacity: 0.55;
}

.finis-ornament {
  display: block;
  width: 64px;
  height: 16px;
  color: var(--gold);
  margin: 2rem auto 0;
  opacity: 0.7;
}

.drop-ornament { animation: ornament-glow 7s var(--ease-soft) infinite; }

/* ============================================================
   COMPLETION SCREEN RINGS
   ============================================================ */

.complete-rings {
  position: relative;
  width: 200px;
  height: 200px;
  margin: 0 auto 1.4rem;
}

/* A soft gold halo sits behind the glyph, so the centre reads as a lit medallion
   rather than a bare character among empty rings. */
.complete-rings::before {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 150px; height: 150px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(184, 146, 58, 0.18), transparent 68%);
  pointer-events: none;
  z-index: 1;
}

.complete-rings .complete-ornament {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  font-size: 4rem;
  z-index: 2;
}

/* ============================================================
   PER-SCENE BODY BACKGROUNDS
   ============================================================ */

body {
  transition: background-color 1200ms var(--ease-quill);
}

body[data-scene="cosmos"] {
  background:
    radial-gradient(1400px 800px at 50% -20%, rgba(184, 146, 58, 0.08), transparent 65%),
    radial-gradient(900px 600px at 110% 80%, rgba(184, 85, 46, 0.05), transparent 65%),
    var(--dusk) !important;
  color: var(--paper);
}
body[data-scene="cosmos"] .site-footer { color: rgba(244, 237, 224, 0.6); }
body[data-scene="cosmos"] .site-footer .site-mark { color: rgba(244, 237, 224, 0.78); }
body[data-scene="cosmos"] .reader-body { color: rgba(244, 237, 224, 0.88); }
body[data-scene="cosmos"] .reader-title,
body[data-scene="cosmos"] .reader-level-title,
body[data-scene="cosmos"] .cat-head h1,
body[data-scene="cosmos"] .complete h1 { color: var(--paper); }
body[data-scene="cosmos"] .reader-tagline,
body[data-scene="cosmos"] .cat-head-blurb,
body[data-scene="cosmos"] .complete p { color: rgba(244, 237, 224, 0.65); }
body[data-scene="cosmos"] .reader-body .prose-reveal:first-of-type p:first-of-type::first-letter,
body[data-scene="cosmos"] .reader-body > p:first-of-type::first-letter {
  color: var(--gold);
  text-shadow: 0 0 18px rgba(184, 146, 58, 0.35);
}
/* On the night scene the small-caps opening line reads as warm paper, not ink */
body[data-scene="cosmos"] .reader-body .prose-reveal:first-of-type p:first-of-type:first-line,
body[data-scene="cosmos"] .reader-body > p:first-of-type:first-line { color: var(--paper); }
/* The lede paragraph also flips to paper on the dark scene (the light-theme
   rule above sets it to ink, which would vanish on dusk). */
body[data-scene="cosmos"] .reader-body .prose-reveal:first-of-type p:first-of-type,
body[data-scene="cosmos"] .reader-body > p:first-of-type { color: var(--paper); }
body[data-scene="cosmos"] .crumbs button,
body[data-scene="cosmos"] .crumbs span { color: rgba(244, 237, 224, 0.7); }
body[data-scene="cosmos"] .back-btn { color: rgba(244, 237, 224, 0.7); }
body[data-scene="cosmos"] .keyhint { color: rgba(244, 237, 224, 0.7); }
body[data-scene="cosmos"] .keyhint kbd {
  background: rgba(244, 237, 224, 0.08);
  border-color: rgba(244, 237, 224, 0.18);
  color: var(--paper);
}
body[data-scene="cosmos"] .rail-dot { border-color: rgba(244, 237, 224, 0.25); }
body[data-scene="cosmos"] .reader-cat-badge {
  color: var(--gold);
  border-color: var(--gold-soft);
}
body[data-scene="cosmos"] .reader-readtime,
body[data-scene="cosmos"] .reader-eyebrow,
body[data-scene="cosmos"] .reader-meta { color: rgba(244, 237, 224, 0.7); }
body[data-scene="cosmos"] .meta-time { color: rgba(244, 237, 224, 0.82); }
body[data-scene="cosmos"] .pullquote { color: var(--gold); }
body[data-scene="cosmos"] .prose code {
  background: rgba(184, 146, 58, 0.12);
  color: var(--gold);
  border-color: rgba(184, 146, 58, 0.22);
}
body[data-scene="cosmos"] .prose pre {
  background: rgba(244, 237, 224, 0.04);
  color: var(--paper);
  border-color: rgba(244, 237, 224, 0.1);
}
body[data-scene="cosmos"] .btn-continue {
  background: var(--gold);
  color: var(--dusk);
}
body[data-scene="cosmos"] .btn-continue:hover {
  background: var(--paper);
  color: var(--dusk);
}
body[data-scene="cosmos"] ::selection {
  background: rgba(184, 146, 58, 0.35);
  color: var(--paper);
}

body[data-scene="nature"] {
  background:
    radial-gradient(1400px 800px at 30% -20%, rgba(107, 125, 92, 0.10), transparent 65%),
    radial-gradient(900px 600px at 110% 110%, rgba(184, 146, 58, 0.06), transparent 65%),
    var(--paper);
}

body[data-scene="philosophy"] {
  background:
    radial-gradient(1400px 800px at 50% -20%, rgba(138, 58, 26, 0.06), transparent 65%),
    radial-gradient(900px 600px at 110% 80%, rgba(184, 146, 58, 0.05), transparent 65%),
    var(--paper);
}

body[data-scene="history"] {
  background:
    radial-gradient(1400px 800px at 70% -20%, rgba(184, 146, 58, 0.10), transparent 60%),
    var(--paper);
}

body[data-scene="money"] {
  background:
    radial-gradient(1400px 800px at 30% -20%, rgba(125, 98, 51, 0.08), transparent 65%),
    var(--paper);
}

body[data-scene="body"] {
  background:
    radial-gradient(1400px 800px at 50% -20%, rgba(168, 90, 74, 0.08), transparent 65%),
    radial-gradient(900px 600px at 110% 110%, rgba(184, 146, 58, 0.05), transparent 65%),
    var(--paper);
}

body[data-scene="mind"] {
  background:
    radial-gradient(1400px 800px at 50% -20%, rgba(107, 74, 125, 0.07), transparent 65%),
    var(--paper);
}

body[data-scene="craft"] {
  background:
    radial-gradient(1400px 800px at 30% -20%, rgba(176, 107, 58, 0.08), transparent 65%),
    var(--paper);
}

body[data-scene="home"] {
  background:
    radial-gradient(1400px 800px at 50% -20%, rgba(125, 90, 58, 0.07), transparent 65%),
    var(--paper);
}

body[data-scene="digital"] {
  background:
    radial-gradient(1400px 800px at 30% -20%, rgba(58, 90, 125, 0.09), transparent 65%),
    radial-gradient(900px 600px at 110% 110%, rgba(58, 90, 125, 0.05), transparent 65%),
    var(--paper);
}

body[data-scene="music"] {
  background:
    radial-gradient(1400px 800px at 30% -20%, rgba(120, 86, 140, 0.08), transparent 65%),
    radial-gradient(900px 600px at 110% 110%, rgba(184, 146, 58, 0.05), transparent 65%),
    var(--paper);
}

body[data-scene="science"] {
  background:
    radial-gradient(1400px 800px at 30% -20%, rgba(201, 123, 74, 0.09), transparent 65%),
    radial-gradient(900px 600px at 110% 110%, rgba(184, 146, 58, 0.05), transparent 65%),
    var(--paper);
}

body[data-scene="mathematics"] {
  background:
    radial-gradient(1400px 800px at 55% -20%, rgba(107, 125, 92, 0.09), transparent 65%),
    var(--paper);
}

body[data-scene="technology"] {
  background:
    radial-gradient(1400px 800px at 30% -20%, rgba(44, 52, 71, 0.08), transparent 65%),
    radial-gradient(900px 600px at 110% 110%, rgba(61, 50, 42, 0.05), transparent 65%),
    var(--paper);
}

body[data-scene="art"] {
  background:
    radial-gradient(1400px 800px at 30% -20%, rgba(162, 94, 58, 0.09), transparent 65%),
    radial-gradient(900px 600px at 110% 110%, rgba(184, 146, 58, 0.05), transparent 65%),
    var(--paper);
}

/* ============================================================
   FOCUS RING (beautiful gold)
   ============================================================ */

:focus-visible {
  /* accent-deep gives ~6.7:1 vs paper (gold was only ~2.5:1 — failed WCAG 1.4.11);
     the gold glow stays as a decorative second ring */
  outline: 2px solid var(--accent-deep);
  outline-offset: 3px;
  border-radius: 4px;
  box-shadow: 0 0 0 5px rgba(184, 146, 58, 0.20);
}

/* On the dark cosmos scene, gold (4.3:1 on dusk) reads better than sienna */
body[data-scene="cosmos"] :focus-visible {
  outline-color: var(--gold);
  box-shadow: 0 0 0 5px rgba(244, 237, 224, 0.18);
}

/* ============================================================
   CUSTOM SCROLLBAR (subtle, warm tones)
   ============================================================ */

html {
  scrollbar-width: thin;
  scrollbar-color: rgba(184, 146, 58, 0.35) transparent;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(184, 146, 58, 0.32);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
  transition: background-color 200ms;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(184, 146, 58, 0.55);
  background-clip: padding-box;
}

body[data-scene="cosmos"] {
  scrollbar-color: rgba(244, 237, 224, 0.22) transparent;
}
body[data-scene="cosmos"] ::-webkit-scrollbar-thumb {
  background: rgba(244, 237, 224, 0.22);
  background-clip: padding-box;
}

/* ============================================================
   RESPONSIVE TUNING
   Reader-side adjustments kick in at ≤600px (matching the grids) so the
   421–600px band — large phones in portrait — is no longer a dead zone where
   the topbar crowded and the Continue button overflowed.
   ============================================================ */

@media (max-width: 600px) {
  /* Reader topbar: let it wrap, shrink the rail, drop the truncating label
     (its full text is already carried by the progressbar's aria-valuetext). */
  .reader-topbar { flex-wrap: wrap; row-gap: 0.5rem; margin-bottom: 1.8rem; }
  .progress-rail { flex: 1; justify-content: flex-end; }
  .progress-rail .rail-depth-label { display: none; }
  .progress-thread { min-width: 96px; max-width: 180px; }

  /* Continue button goes full-width so it never overruns the gutter */
  .btn-continue { min-width: 0; width: 100%; padding: 1rem 1.4rem; }
  .continue-row { gap: 0.6rem; }

  /* Neutralize the pullquote's negative offsets that overflowed narrow screens */
  .pullquote { margin-left: 0; padding-left: 0.9em; }
  .pullquote::before { left: -0.05em; top: -0.15em; font-size: 1.8em; }

  /* Slightly calmer reading measure on small screens */
  .reader-body { font-size: 1.14rem; line-height: 1.78; }
}

@media (max-width: 420px) {
  .home-masthead { padding: 2rem 0 1.4rem; }
  .hero-orrery { width: 120vw; height: 120vw; opacity: 0.14; }
  .cat-card { padding: 0 1.2rem 1.2rem; }
  .cat-illus { width: calc(100% + 2.4rem); height: 100px; margin: 0 -1.2rem 0.8rem; padding: 0.4rem 0.8rem 0; }
  .cat-card .cat-name { font-size: 1.7rem; }
  .topic-card { min-height: 200px; padding: 1.4rem 1.3rem 1.2rem; }
  .progress-thread { max-width: 140px; }
  .complete-rings { width: 160px; height: 160px; }
  .complete-rings .complete-ornament { font-size: 3rem; }
  .reader-title { font-size: clamp(2rem, 9vw, 2.6rem); }
}

/* ============================================================
   SELECTION (warm sienna)
   ============================================================ */

::selection {
  background: rgba(184, 85, 46, 0.22);
  color: var(--ink);
}