:root {
  color-scheme: light;

  /* Semantic palette */
  --paper: #f7f5f0;
  --paper-soft: #efece6;
  --paper-card: #ffffff;
  --ink: #161616;
  --ink-2: #4a4a4a;
  --ink-3: #5f5f5f;
  --risk: #b81e26;
  --risk-deep: #8f161c;
  --proof: #9a5b00;
  --safe: #1c7a47;
  --stamp: #2b4a6f;

  /* Tints and aliases retained for existing page CSS */
  --risk-soft: #d94852;
  --risk-faint: rgba(184, 30, 38, 0.08);
  --proof-faint: rgba(154, 91, 0, 0.12);
  --safe-faint: rgba(28, 122, 71, 0.12);
  --stamp-faint: rgba(43, 74, 111, 0.1);
  --rule: rgba(22, 22, 22, 0.08);
  --bg: var(--paper);
  --bg-2: var(--paper-card);
  --bg-soft: var(--paper-soft);
  --accent: var(--risk);
  --accent-soft: var(--risk-soft);
  --accent-faint: var(--risk-faint);
  --warn: var(--proof);
  --ok: var(--safe);

  /* Typography */
  --font-display: 'Clash Display', 'General Sans', ui-sans-serif, system-ui, sans-serif;
  --font-body: 'Satoshi', 'General Sans', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Noto Sans SC', 'Noto Sans TC', ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-cjk-sc: 'Noto Sans SC', 'Satoshi', 'General Sans', ui-sans-serif, system-ui, sans-serif;
  --font-cjk-tc: 'Noto Sans TC', 'Satoshi', 'General Sans', ui-sans-serif, system-ui, sans-serif;

  /* 4px spacing scale */
  --space-0: 0;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --gap-xs: var(--space-2);
  --gap-sm: var(--space-4);
  --gap-md: var(--space-6);
  --gap-lg: var(--space-12);
  --gap-xl: var(--space-24);

  /* Radius */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  /* Elevation */
  --elevation-1: 0 1px 0 var(--rule);
  --elevation-2: 0 10px 30px rgba(22, 22, 22, 0.06);
  --elevation-3: 0 22px 60px rgba(22, 22, 22, 0.1);

  /* Motion */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-cubic: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --duration-fast: 180ms;
  --duration-med: 250ms;
  --duration-slow: 420ms;

  /* Focus */
  --focus-ring-color: rgba(184, 30, 38, 0.28);
  --focus-ring: 0 0 0 3px var(--focus-ring-color);
}

.audience-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1);
  border: 1px solid var(--rule);
  border-radius: var(--radius-pill);
  background: var(--bg-2);
}

.audience-toggle button {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-3);
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--ink-2);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
}

.audience-toggle button:hover {
  color: var(--accent);
}

.audience-toggle button[aria-pressed="true"],
.audience-toggle button.is-active {
  background: var(--accent);
  color: var(--bg-2);
}

.nav-links .scan-pill,
.scan-pill.scan-pill {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.nav-links .scan-pill:hover,
.scan-pill.scan-pill:hover {
  background: var(--risk-deep);
  border-color: var(--risk-deep);
  color: #fff;
}

.hero-kicker {
  display: block;
  margin: 0 0 var(--space-3);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.35;
  text-transform: uppercase;
}

html[lang^="zh"] .hero-kicker {
  letter-spacing: 0.08em;
  text-transform: none;
}

.audience-entry {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
}

.audience-entry-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.entry-card {
  width: 100%;
  min-height: 176px;
  padding: var(--space-5);
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background: var(--bg-2);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  box-shadow: var(--elevation-1);
  transition: border-color var(--duration-fast) ease, box-shadow var(--duration-fast) ease, transform var(--duration-fast) ease;
}

.entry-card:hover {
  border-color: rgba(184, 30, 38, 0.32);
  box-shadow: var(--elevation-2);
  transform: translateY(-1px);
}

html[data-audience="student"] .entry-card[data-audience-choice="student"],
html[data-audience="pro"] .entry-card[data-audience-choice="pro"],
.entry-card.is-active {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent), var(--elevation-2);
}

.entry-card-eyebrow {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.entry-card-title {
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0;
}

.entry-card-copy {
  display: block;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.45;
}

.scan-note {
  max-width: 620px;
  margin: var(--space-3) 0 0;
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.45;
}

.scan-note:empty {
  display: none;
}

.mobile-audience-switch {
  display: none;
  background: var(--bg);
}

main > .act-check,
main > .act-get {
  background: var(--bg);
}

main > .act-why {
  background: var(--bg-soft);
}

.engine-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-top: var(--gap-md);
  padding-top: var(--space-6);
  border-top: 1px solid var(--rule);
}

.engine-stats .stat {
  flex: 1 1 220px;
  min-height: 0;
  padding: 0;
  border-top: 0;
}

.engine-stats .stat-number {
  font-size: clamp(44px, 7vw, 64px);
}

.pricing-grid.pricing-primary,
.pricing-grid.pricing-secondary {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.pricing-grid.pricing-primary {
  margin-bottom: var(--space-8);
}

.pricing-grid.pricing-secondary {
  align-items: stretch;
  padding-top: var(--space-6);
  border-top: 1px solid var(--rule);
}

.pricing-secondary-label {
  margin: var(--space-8) 0 var(--space-3);
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.4;
  text-transform: uppercase;
}

.tier-card.tier-card-secondary {
  min-height: 0;
  background: transparent;
  box-shadow: none;
}

.tier-card.tier-card-secondary .tier-price {
  color: var(--ink);
  font-size: 40px;
}

.tier-card.tier-card-secondary ul {
  margin: var(--space-5) 0;
}

.tier-badge.is-free {
  top: var(--space-4);
  right: var(--space-4);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--accent);
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: #fff;
  letter-spacing: 0.12em;
}

.tier-selector {
  margin: var(--space-3) 0 0;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.45;
}

.evidence-ledger {
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background: var(--paper-card);
  box-shadow: var(--elevation-2);
}

.tally {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--rule);
  background: var(--paper-soft);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.45;
  text-transform: uppercase;
}

.tally strong,
.tally .is-safe {
  color: var(--safe);
}

.tally .is-proof {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--proof);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.tally .is-cut {
  color: var(--risk-deep);
}

.meter {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: 1px solid var(--rule);
  background: var(--paper-soft);
}

.meter-top,
.meter-caption {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-3);
}

.meter-value {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: clamp(42px, 12vw, 72px);
  font-style: italic;
  font-weight: 700;
  line-height: 0.86;
}

.meter-denominator {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 16px;
  font-style: normal;
  font-weight: 700;
  letter-spacing: 0;
}

.meter-label,
.meter-caption {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1.45;
  text-transform: uppercase;
}

.meter-track {
  position: relative;
  height: 14px;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: var(--radius-pill);
  background: var(--paper);
}

.meter-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: min(var(--meter-fill, 0%), 96%);
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--safe), var(--proof));
}

.meter-stop {
  position: absolute;
  top: -4px;
  bottom: -4px;
  left: min(var(--meter-fill, 0%), 96%);
  width: 3px;
  background: var(--ink);
}

.claim-stack {
  display: grid;
}

.claim-card {
  position: relative;
  display: grid;
  grid-template-columns: 3px minmax(0, 1fr);
  min-width: 0;
  border-bottom: 1px solid var(--rule);
  background: var(--paper-card);
  color: var(--ink);
}

.claim-card:last-child {
  border-bottom: 0;
}

.claim-card::before,
.claim-rail {
  content: "";
  background: var(--ink-3);
}

.claim-card[data-state="safe"]::before,
.claim-card[data-state="defensible"]::before,
.claim-card[data-state="safe"] .claim-rail,
.claim-card[data-state="defensible"] .claim-rail {
  background: var(--safe);
}

.claim-card[data-state="proof"]::before,
.claim-card[data-state="needs-proof"]::before,
.claim-card[data-state="proof"] .claim-rail,
.claim-card[data-state="needs-proof"] .claim-rail {
  background: var(--proof);
}

.claim-card[data-state="cut"]::before,
.claim-card[data-state="risk"]::before,
.claim-card[data-state="cut"] .claim-rail,
.claim-card[data-state="risk"] .claim-rail {
  background: var(--risk);
}

.claim-body {
  display: grid;
  gap: var(--space-4);
  min-width: 0;
  padding: var(--space-10) var(--space-4) var(--space-4);
}

.exhibit-tab {
  position: absolute;
  top: 0;
  left: 3px;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 28px;
  padding: 0 var(--space-3);
  border-radius: 0 0 var(--radius-xs) 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.2;
  text-transform: uppercase;
}

.claim-main {
  display: grid;
  gap: var(--space-3);
}

.claim-text {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.claim-text s {
  color: var(--risk-deep);
  text-decoration-color: var(--risk);
  text-decoration-thickness: 2px;
}

.verdict-chip {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  min-height: 28px;
  padding: 0 var(--space-3);
  border: 1px solid var(--rule);
  border-radius: var(--radius-xs);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.2;
  text-transform: uppercase;
}

.claim-card[data-state="safe"] .verdict-chip,
.claim-card[data-state="defensible"] .verdict-chip {
  border-color: rgba(28, 122, 71, 0.28);
  background: var(--safe-faint);
  color: var(--safe);
}

.claim-card[data-state="proof"] .verdict-chip,
.claim-card[data-state="needs-proof"] .verdict-chip {
  border-color: rgba(154, 91, 0, 0.32);
  background: var(--proof-faint);
  color: var(--ink);
}

.claim-card[data-state="cut"] .verdict-chip,
.claim-card[data-state="risk"] .verdict-chip {
  border-color: rgba(184, 30, 38, 0.28);
  background: var(--risk-faint);
  color: var(--risk-deep);
}

.claim-grid {
  display: grid;
  gap: var(--space-3);
}

.claim-detail {
  display: grid;
  gap: var(--space-1);
}

.claim-detail-label {
  color: var(--ink-3);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.35;
  text-transform: uppercase;
}

.claim-detail p {
  margin: 0;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.55;
}

.proof-chip,
.claim-card mark {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 26px;
  margin: 0 var(--space-1);
  padding: var(--space-1) var(--space-2);
  border: 1px solid rgba(154, 91, 0, 0.36);
  border-radius: var(--radius-pill);
  background: var(--proof-faint);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.35;
  text-transform: uppercase;
  vertical-align: baseline;
  white-space: normal;
}

.proof-chip svg {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  margin-left: var(--space-1);
  color: var(--proof);
}

.the-check .meter-fill {
  animation: meter-hard-stop var(--duration-slow) var(--ease-out-expo) both;
}

.the-check .proof-chip,
.the-check .claim-card mark {
  animation: proof-chip-snap var(--duration-med) var(--ease-out-expo) 260ms both;
}

@keyframes meter-hard-stop {
  from { width: 0; }
  to { width: min(var(--meter-fill, 0%), 96%); }
}

@keyframes proof-chip-snap {
  0% { opacity: 0; transform: scale(0.96); }
  70% { opacity: 1; transform: scale(1.04); }
  100% { opacity: 1; transform: scale(1); }
}

html[data-audience="pro"]:not([data-audience-ready]) [data-aud] {
  visibility: hidden;
}

@media (min-width: 760px) {
  .claim-main {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
  }

  .claim-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .claim-body {
    padding-right: var(--space-6);
    padding-left: var(--space-6);
  }
}

@media (max-width: 980px) {
  .pricing-grid.pricing-primary,
  .pricing-grid.pricing-secondary {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .audience-toggle {
    display: none;
    order: 4;
    flex: 1 0 100%;
    justify-content: center;
    margin-left: 0;
  }

  .nav.is-menu-open .audience-toggle {
    display: inline-flex;
  }

  .mobile-audience-switch {
    display: block;
    margin-top: calc(-1 * var(--space-5));
    padding: 0 0 var(--space-6);
  }

  .mobile-audience-switch .shell {
    display: flex;
    justify-content: center;
  }

  .mobile-audience-switch button {
    display: inline-flex;
    min-height: 44px;
    width: 100%;
    align-items: center;
    justify-content: center;
    padding: 0 var(--space-4);
    border: 1px solid rgba(184, 30, 38, 0.24);
    border-radius: var(--radius-pill);
    background: var(--bg-2);
    color: var(--accent);
    font-size: 14px;
    font-weight: 800;
    line-height: 1.2;
    text-align: center;
    cursor: pointer;
  }

  html[data-audience="student"] .mobile-audience-switch [data-audience-choice="student"],
  html[data-audience="pro"] .mobile-audience-switch [data-audience-choice="pro"] {
    display: none;
  }

  .audience-entry {
    padding: var(--space-6) 0;
  }

  .audience-entry-grid {
    grid-template-columns: 1fr;
  }

  .entry-card {
    min-height: 0;
  }

  .engine-stats {
    gap: var(--space-4);
  }

  .pricing-grid.pricing-primary,
  .pricing-grid.pricing-secondary {
    grid-template-columns: 1fr;
  }

  .meter-top,
  .meter-caption {
    align-items: flex-start;
    flex-direction: column;
  }

  .claim-body {
    padding-top: var(--space-12);
  }
}

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

  .entry-card:hover {
    transform: none;
  }

  .the-check .meter-fill,
  .the-check .proof-chip,
  .the-check .claim-card mark {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}