/* ============================================================
   PREDICTION LAB — design tokens + components
   Aesthetic: light, editorial, science-museum. Violet accent.
   ============================================================ */

:root {
  /* Fluid type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(3rem, 0.5rem + 7vw, 8rem);

  /* Spacing (4px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 220ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 520ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-display: 'Instrument Serif', 'Iowan Old Style', Georgia, serif;
  --font-body: 'Switzer', 'Inter', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, monospace;
}

/* ------------------------- LIGHT (default) ------------------------- */
:root, [data-theme='light'] {
  /* Surfaces — warm paper */
  --color-bg: #F6F3EC;
  --color-surface: #FBF9F3;
  --color-surface-2: #FFFDF7;
  --color-surface-offset: #EFEBE1;
  --color-surface-offset-2: #E7E2D5;
  --color-surface-dynamic: #DDD7C8;
  --color-divider: #D9D3C4;
  --color-border: #CFC9B9;
  --color-border-strong: #A69F8C;

  /* Text — warm ink */
  --color-text: #1C1A15;
  --color-text-muted: #6F695C;
  --color-text-faint: #A69F8C;
  --color-text-inverse: #FBF9F3;

  /* Primary — Deep Violet */
  --color-primary: #4B2FAE;
  --color-primary-hover: #3A2489;
  --color-primary-active: #2A1A63;
  --color-primary-highlight: #E4DBF7;
  --color-primary-soft: #F1ECFB;

  /* Support */
  --color-success: #437A22;
  --color-warning: #964219;
  --color-error: #A12C7B;

  /* Shadows — tone-matched to warm surfaces */
  --shadow-sm: 0 1px 2px oklch(0.2 0.02 80 / 0.06);
  --shadow-md: 0 6px 18px oklch(0.2 0.02 80 / 0.08);
  --shadow-lg: 0 16px 40px oklch(0.2 0.02 80 / 0.14);
}

/* ------------------------- DARK ------------------------- */
[data-theme='dark'] {
  --color-bg: #15131A;
  --color-surface: #1B1922;
  --color-surface-2: #201E28;
  --color-surface-offset: #26242F;
  --color-surface-offset-2: #2E2B38;
  --color-surface-dynamic: #36333F;
  --color-divider: #2B2934;
  --color-border: #3A3744;
  --color-border-strong: #575363;

  --color-text: #EDE9E0;
  --color-text-muted: #938FA0;
  --color-text-faint: #605D6E;
  --color-text-inverse: #15131A;

  --color-primary: #9A7AE8;
  --color-primary-hover: #B39BEF;
  --color-primary-active: #CAB6F5;
  --color-primary-highlight: #302449;
  --color-primary-soft: #201938;

  --color-success: #6DAA45;
  --color-warning: #E6894E;
  --color-error: #D163A7;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.3);
  --shadow-md: 0 6px 18px oklch(0 0 0 / 0.4);
  --shadow-lg: 0 16px 40px oklch(0 0 0 / 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #15131A;
    --color-surface: #1B1922;
    --color-surface-2: #201E28;
    --color-surface-offset: #26242F;
    --color-surface-offset-2: #2E2B38;
    --color-surface-dynamic: #36333F;
    --color-divider: #2B2934;
    --color-border: #3A3744;
    --color-border-strong: #575363;
    --color-text: #EDE9E0;
    --color-text-muted: #938FA0;
    --color-text-faint: #605D6E;
    --color-text-inverse: #15131A;
    --color-primary: #9A7AE8;
    --color-primary-hover: #B39BEF;
    --color-primary-active: #CAB6F5;
    --color-primary-highlight: #302449;
    --color-primary-soft: #201938;
  }
}

/* ============================================================
   LAYOUT PRIMITIVES
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 4vw, var(--space-10));
}
.container-narrow { max-width: var(--content-narrow); }
.container-default { max-width: var(--content-default); }

section { padding-block: clamp(var(--space-12), 6vw, var(--space-24)); }

/* ============================================================
   HEADER
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: saturate(1.3) blur(10px);
  -webkit-backdrop-filter: saturate(1.3) blur(10px);
  border-bottom: 1px solid color-mix(in oklab, var(--color-border) 60%, transparent);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
}
.brand__mark {
  width: 32px; height: 32px;
  color: var(--color-primary);
}
.brand__name { font-style: italic; }
.brand__dot {
  display: inline-block; width: 6px; height: 6px; border-radius: 999px;
  background: var(--color-primary);
  transform: translateY(-0.25em);
  margin-inline: 0.15em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.site-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
}
.site-nav a:hover,
.site-nav a[aria-current='page'] {
  color: var(--color-text);
  background: var(--color-surface-offset);
}
.theme-toggle {
  width: 36px; height: 36px;
  display: inline-grid; place-items: center;
  border-radius: 999px;
  color: var(--color-text-muted);
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-offset); }

/* Mobile nav */
@media (max-width: 720px) {
  .site-nav a:not(.theme-toggle) { display: none; }
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  text-decoration: none;
  line-height: 1;
  min-height: 44px;
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}
.btn--primary:hover { background: var(--color-primary-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn--primary:active { background: var(--color-primary-active); transform: translateY(0); }
.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--ghost:hover { background: var(--color-surface-offset); border-color: var(--color-border-strong); }
.btn--quiet {
  background: transparent;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  min-height: auto;
}
.btn--quiet:hover { color: var(--color-text); }
.btn[disabled] { opacity: 0.4; cursor: not-allowed; }

/* ============================================================
   HERO
   ============================================================ */

.hero {
  padding-block: clamp(var(--space-16), 10vw, var(--space-32)) clamp(var(--space-12), 8vw, var(--space-20));
  position: relative;
  overflow: clip;
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface);
}
.hero__eyebrow::before {
  content: '';
  width: 6px; height: 6px; border-radius: 999px;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--color-primary) 15%, transparent);
}
.hero__title {
  margin-top: var(--space-6);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-2xl);
  letter-spacing: -0.02em;
  line-height: 1.02;
  max-width: 18ch;
}
.hero__title em {
  font-style: italic;
  color: var(--color-primary);
}
.hero__title .u-hair {
  display: inline-block;
  width: 0.4em;
}
.hero__lede {
  margin-top: var(--space-6);
  max-width: 56ch;
  font-size: var(--text-lg);
  color: var(--color-text-muted);
}
.hero__cta {
  margin-top: var(--space-8);
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.hero__glyph {
  position: absolute;
  right: clamp(-10rem, -8vw, -2rem);
  top: 50%;
  transform: translateY(-50%);
  width: min(60vw, 620px);
  opacity: 0.08;
  color: var(--color-primary);
  pointer-events: none;
}
@media (max-width: 900px) {
  .hero__glyph { opacity: 0.05; right: -30%; top: 70%; }
}

/* ============================================================
   CHALLENGE CARDS
   ============================================================ */

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
  flex-wrap: wrap;
}
.section-heading__label {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.section-heading__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-xl);
  letter-spacing: -0.01em;
}
.section-heading__kicker {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--color-primary);
  font-size: var(--text-sm);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}
.challenge-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-6) var(--space-5);
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
  min-height: 260px;
}
.challenge-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}
.challenge-card__no {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.1em;
}
.challenge-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-top: var(--space-2);
}
.challenge-card__desc {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  flex: 1;
}
.challenge-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px dashed var(--color-border);
  padding-top: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}
.challenge-card__meta .arrow {
  color: var(--color-primary);
  font-size: var(--text-lg);
  transition: transform var(--transition-interactive);
}
.challenge-card:hover .arrow { transform: translateX(4px); }
.challenge-card.is-soon {
  opacity: 0.65;
  pointer-events: none;
}
.challenge-card.is-soon::after {
  content: 'Soon';
  position: absolute;
  top: var(--space-4); right: var(--space-4);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 2px 10px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
}

/* ============================================================
   PROMISE / MANIFESTO
   ============================================================ */
.promise {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.promise__grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-10);
}
@media (max-width: 820px) {
  .promise__grid { grid-template-columns: 1fr; }
}
.promise__heading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  letter-spacing: -0.01em;
}
.promise__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-6) var(--space-8);
  list-style: none;
}
.promise__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
}
.promise__term {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--color-primary);
  font-size: var(--text-base);
}
.promise__def {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  padding-block: var(--space-16) var(--space-8);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-10);
}
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr; }
}
.footer-col h4 {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  font-weight: 500;
}
.footer-col ul { list-style: none; display: grid; gap: var(--space-2); }
.footer-col a { color: var(--color-text); text-decoration: none; font-size: var(--text-sm); }
.footer-col a:hover { color: var(--color-primary); }
.footer-tag {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-lg);
  max-width: 40ch;
  color: var(--color-text-muted);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-faint);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}
@media (max-width: 560px) {
  .footer-bottom { flex-direction: column; }
}

/* ============================================================
   CONSENT BANNER
   ============================================================ */
.consent {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  left: auto;
  width: min(380px, calc(100vw - var(--space-8)));
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-5);
  display: grid;
  gap: var(--space-4);
  z-index: 50;
  transform: translateY(0);
  transition: transform var(--transition-slow), opacity var(--transition-slow);
}
@media (max-width: 560px) {
  .consent {
    left: var(--space-3);
    right: var(--space-3);
    width: auto;
  }
}
.consent[hidden] { display: none; }
.consent__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.25;
}
.consent__body {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-top: var(--space-2);
}
.consent__actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ============================================================
   CHALLENGE PAGES — shared
   ============================================================ */
.crumb {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  text-transform: uppercase;
  text-decoration: none;
}
.crumb:hover { color: var(--color-text); }
.crumb::before { content: '←'; font-family: var(--font-body); }

.page-head {
  padding-top: var(--space-12);
  padding-bottom: var(--space-8);
}
.page-head__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}
.page-head__title {
  margin-top: var(--space-4);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-2xl);
  letter-spacing: -0.02em;
  line-height: 1.05;
  max-width: 20ch;
}
.page-head__title em {
  font-style: italic;
  color: var(--color-primary);
}
.page-head__lede {
  margin-top: var(--space-5);
  max-width: 60ch;
  color: var(--color-text-muted);
  font-size: var(--text-lg);
}

.stage {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: clamp(var(--space-6), 4vw, var(--space-10));
  position: relative;
  overflow: hidden;
  display: grid;
  gap: var(--space-8);
  min-height: 420px;
}
.stage::before {
  /* Subtle grid texture */
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, color-mix(in oklab, var(--color-border) 45%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in oklab, var(--color-border) 45%, transparent) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, black 30%, transparent 80%);
  opacity: 0.5;
  pointer-events: none;
}
.stage > * { position: relative; z-index: 1; }

.step-dots {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}
.step-dot {
  width: 32px; height: 2px;
  background: var(--color-border);
  border-radius: 999px;
  transition: background var(--transition-interactive);
}
.step-dot.is-active { background: var(--color-primary); }
.step-dot.is-done { background: var(--color-text); }

.step-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.prompt {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-xl);
  letter-spacing: -0.01em;
  line-height: 1.15;
  max-width: 26ch;
}
.prompt em { font-style: italic; color: var(--color-primary); }

/* ----- Number challenge controls ----- */
.chips {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.chip {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
  min-height: 44px;
}
.chip:hover { border-color: var(--color-border-strong); background: var(--color-surface-offset); }
.chip.is-selected {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.number-input {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  line-height: 1;
  max-width: 100%;
}
.number-input input {
  width: 100%;
  font: inherit;
  background: transparent;
  border: 0;
  border-bottom: 2px solid var(--color-border);
  padding: var(--space-3) 0;
  color: var(--color-text);
  outline: none;
  font-variant-numeric: tabular-nums;
}
.number-input input:focus {
  border-bottom-color: var(--color-primary);
}
.number-input .hint {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  white-space: nowrap;
}

/* ----- Writing challenge controls ----- */
.opening {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.5rem, 1rem + 2vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  min-height: 3em;
}
.opening .cursor {
  display: inline-block;
  width: 3px; height: 1em;
  background: var(--color-primary);
  vertical-align: -0.15em;
  margin-left: 0.1em;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.continuations {
  display: grid;
  gap: var(--space-3);
}
.continuation-btn {
  text-align: left;
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1.25;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-5);
}
.continuation-btn:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}
.continuation-btn .prob {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  white-space: nowrap;
  padding-top: 0.35em;
}

/* ----- Confidence meter ----- */
.meter {
  display: grid;
  gap: var(--space-2);
}
.meter__track {
  position: relative;
  height: 8px;
  background: var(--color-surface-offset);
  border-radius: 999px;
  overflow: hidden;
}
.meter__fill {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: var(--v, 50%);
  background: linear-gradient(to right, color-mix(in oklab, var(--color-primary) 60%, transparent), var(--color-primary));
  transition: width var(--transition-slow);
}
.meter__band {
  position: absolute;
  top: 0; bottom: 0;
  background: color-mix(in oklab, var(--color-primary) 18%, transparent);
  border-left: 1px solid var(--color-primary);
  border-right: 1px solid var(--color-primary);
}
.meter__labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
}

/* ----- Reveal ----- */
.reveal {
  display: grid;
  gap: var(--space-8);
  animation: revealIn 700ms cubic-bezier(0.16, 1, 0.3, 1) both;
}
@keyframes revealIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal__big {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-hero);
  letter-spacing: -0.04em;
  line-height: 0.9;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}
.reveal__big em { font-style: italic; }

.reveal__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4) var(--space-8);
}
.reveal__fact {
  display: grid;
  gap: var(--space-2);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-3);
}
.reveal__fact dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.reveal__fact dd {
  font-size: var(--text-base);
  color: var(--color-text);
}

.reveal__why {
  background: var(--color-primary-soft);
  border: 1px solid color-mix(in oklab, var(--color-primary) 30%, transparent);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-6);
  display: grid;
  gap: var(--space-3);
}
.reveal__why h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  letter-spacing: -0.01em;
}
.reveal__why ul {
  list-style: none;
  display: grid;
  gap: var(--space-2);
}
.reveal__why li {
  position: relative;
  padding-left: var(--space-5);
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-text);
}
.reveal__why li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px; height: 6px;
  background: var(--color-primary);
  border-radius: 999px;
}
.reveal__why li strong { color: var(--color-text); font-weight: 600; }

.reveal__limits {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border-left: 2px solid var(--color-border);
  padding: var(--space-2) var(--space-4);
}
.reveal__limits strong { color: var(--color-text); font-weight: 500; }

.actions-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
}

/* ============================================================
   ETHICS / TRANSPARENCY PAGE
   ============================================================ */
.article {
  max-width: var(--content-narrow);
  margin-inline: auto;
}
.article h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-xl);
  letter-spacing: -0.01em;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
}
.article h2:first-of-type { margin-top: 0; }
.article p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  font-size: var(--text-base);
  max-width: 70ch;
}
.article strong { color: var(--color-text); font-weight: 500; }
.article ul {
  margin: var(--space-4) 0 var(--space-6);
  padding-left: var(--space-5);
  color: var(--color-text-muted);
  display: grid; gap: var(--space-2);
}
.article li { max-width: 68ch; }
.article li::marker { color: var(--color-primary); }

.model-facts {
  margin: var(--space-8) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  background: var(--color-surface);
  display: grid;
  gap: var(--space-4);
}
.model-facts__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 2px solid var(--color-text);
  padding-bottom: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.model-facts__row {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
}
.model-facts__row:last-child { border-bottom: 0; padding-bottom: 0; }
.model-facts__row dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.model-facts__row dd { color: var(--color-text); }

/* ============================================================
   UTILITIES
   ============================================================ */
.u-mono { font-family: var(--font-mono); }
.u-muted { color: var(--color-text-muted); }
.u-mt-8 { margin-top: var(--space-8); }
.u-mt-12 { margin-top: var(--space-12); }
.fade-in { animation: fadeIn 400ms cubic-bezier(0.16, 1, 0.3, 1) both; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* Hidden-but-accessible helper for step state */
[data-view] { display: none; }
[data-view].is-active { display: grid; }