:root {
  color-scheme: light;
  --color-bg: #faf8f4;
  --color-surface: #f2ede4;
  --color-text: #1c1a18;
  --color-muted: #62584f;
  --color-accent-warm: #8b2635;
  --color-accent-cold: #1b365d;
  --color-border: rgba(28, 26, 24, 0.12);
  --font-display: "Cormorant Garamond", Georgia, serif;
  --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;
  --space-xs: 0.75rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --shadow-soft: 0 12px 30px rgba(27, 54, 93, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: linear-gradient(180deg, #fcfbf8 0%, var(--color-bg) 100%);
  color: var(--color-text);
}

a {
  color: inherit;
}

.site-header,
.page-shell,
.site-footer {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  padding: 1.5rem 0;
}

.site-header-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.home-link {
  display: flex;
  align-items: center;
  color: var(--color-muted);
  text-decoration: none;
  transition: color 150ms ease;
}

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

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.brand-link,
.site-nav a {
  text-decoration: none;
}

.page-shell {
  padding: var(--space-lg) 0 var(--space-xl);
}

.hero-block,
.journey-block {
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.76);
  box-shadow: var(--shadow-soft);
}

.chapter-preview-block {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.chapter-card,
.method-block {
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.84);
  box-shadow: var(--shadow-soft);
}

.content-section {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  margin-bottom: var(--space-md);
}

.secondary-card {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-xs);
}

.hero-block,
.chapter-card,
.method-block,
.journey-block,
.insight-strip,
.chapter-layout {
  margin-bottom: var(--space-md);
}

.content-section > * + * {
  margin-top: var(--space-sm);
}

.eyebrow {
  margin: 0 0 var(--space-sm);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-warm);
  font-size: 0.75rem;
}

h1,
h2 {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 0 0 var(--space-md);
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.05;
}

h2 {
  font-size: clamp(1.35rem, 2.8vw, 1.9rem);
  line-height: 1.1;
}

h3 {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent-cold);
  margin: 0 0 0.5rem;
}

h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.35rem;
}

.hero-copy {
  max-width: 62ch;
  color: var(--color-muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.primary-cta {
  display: inline-flex;
  margin-top: var(--space-md);
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  background: var(--color-accent-warm);
  color: #fffdf9;
  text-decoration: none;
}

.journey-list {
  margin: 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 0.75rem;
}

.chapter-number {
  margin: 0 0 var(--space-sm);
  color: var(--color-accent-warm);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.chapter-card h2,
.method-block h2 {
  margin-bottom: var(--space-sm);
}

.chapter-card a {
  color: var(--color-accent-cold);
  font-weight: 600;
  text-decoration: none;
}

.chapter-card .primary-cta,
.primary-cta {
  color: #fffdf9;
}

.site-footer {
  padding: 0 0 var(--space-lg);
  color: var(--color-muted);
}

.site-footer a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.chapter-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.chapter-card--wide {
  min-height: 100%;
}

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

.insight-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.insight-card {
  padding: 1.25rem 1.4rem;
  border: 1px solid var(--color-border);
  border-radius: 1.25rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94) 0%, rgba(242, 237, 228, 0.7) 100%);
  box-shadow: var(--shadow-soft);
}

.insight-card h2 {
  font-size: clamp(1.2rem, 2vw, 1.6rem);
}

.insight-card p:last-child {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.6;
}

.dimension-card {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.dimension-card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
}

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

.principle-card {
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.78) 0%, rgba(242, 237, 228, 0.85) 100%);
}

.disclosure-trigger {
  width: 100%;
  padding: 1.2rem 1.25rem 1rem;
  border: 0;
  background: transparent;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  text-align: left;
  cursor: pointer;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
}

.disclosure-mark {
  min-width: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(139, 38, 53, 0.1);
  color: var(--color-accent-warm);
  font-family: var(--font-body);
  font-size: 1.15rem;
  line-height: 1;
}

.disclosure-panel {
  padding: 0 1.25rem 1.25rem;
}

.principle-card p {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.6;
}

.disclosure-card.is-open {
  box-shadow: var(--shadow-soft);
}

.chapter-anchor-nav {
  position: sticky;
  top: 0.75rem;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: var(--space-md) 0;
  padding: 0.9rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: rgba(250, 248, 244, 0.9);
  backdrop-filter: blur(12px);
}

.chapter-anchor-nav a {
  text-decoration: none;
  color: var(--color-accent-cold);
  font-weight: 600;
}

.ai-act-form {
  display: grid;
  gap: var(--space-sm);
}

.ai-act-fieldset {
  margin: 0;
  padding: 1.15rem 1.2rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: grid;
  gap: 0.9rem;
  background: rgba(255, 255, 255, 0.92);
}

.ai-act-fieldset legend {
  padding: 0;
  font-weight: 600;
  font-size: 1.05rem;
  max-width: 42rem;
}

.ai-step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-right: 0.75rem;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  background: rgba(27, 54, 93, 0.08);
  color: var(--color-accent-cold);
  font-size: 0.85rem;
}

.ai-act-choice-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.ai-act-choice {
  position: relative;
  min-width: 9rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: #fffdfa;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease, color 120ms ease,
    transform 120ms ease;
}

.ai-act-choice input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.ai-act-choice.is-selected {
  border-color: rgba(139, 38, 53, 0.35);
  background: rgba(139, 38, 53, 0.08);
  color: var(--color-accent-warm);
  transform: translateY(-1px);
}

.ai-act-result {
  margin-top: var(--space-md);
}

.ai-act-note {
  color: var(--color-muted);
  line-height: 1.6;
}

/* ── AI Act two-panel ── */
.ai-act-two-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  align-items: start;
}

.ai-act-progress-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.ai-act-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--color-surface);
  border-radius: 3px;
  overflow: hidden;
}

.ai-act-progress-fill {
  height: 100%;
  background: var(--color-accent-cold);
  border-radius: 3px;
  transition: width 200ms ease;
}

.ai-act-progress-label {
  font-size: 0.75rem;
  color: var(--color-muted);
  white-space: nowrap;
}

.ai-act-step-context {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  color: var(--color-muted);
  line-height: 1.6;
  padding: 0.6rem 0.85rem;
  background: rgba(27, 54, 93, 0.04);
  border-radius: 0.5rem;
}

.ai-act-step-article {
  margin: 0 0 0.75rem;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-accent-cold);
  letter-spacing: 0.04em;
}

.ai-act-fieldset.is-answered {
  opacity: 0.6;
}

.ai-act-fieldset.is-answered .ai-act-step-context,
.ai-act-fieldset.is-answered .ai-act-step-article {
  display: none;
}

.ai-act-result-summary {
  margin-top: var(--space-md);
  padding: var(--space-md);
  background: rgba(27, 54, 93, 0.06);
  border-left: 3px solid var(--color-accent-cold);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.ai-act-checklist-progress {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin: var(--space-sm) 0 var(--space-md);
  font-size: 0.8rem;
  color: var(--color-muted);
}

.ai-act-checklist-progress progress {
  flex: 1;
  height: 6px;
  border: none;
  border-radius: 3px;
  background: var(--color-surface);
}

.ai-act-checklist-progress progress::-webkit-progress-bar {
  background: var(--color-surface);
  border-radius: 3px;
}

.ai-act-checklist-progress progress::-webkit-progress-value {
  background: var(--color-accent-cold);
  border-radius: 3px;
}

.ai-act-req-group {
  margin-bottom: var(--space-md);
}

.ai-act-req-group-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-warm);
  margin-bottom: var(--space-xs);
}

.ai-act-req-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.7);
  margin-bottom: 0.5rem;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease;
}

.ai-act-req-item:has(input:checked) {
  border-color: rgba(27, 54, 93, 0.25);
  background: rgba(27, 54, 93, 0.04);
}

.ai-act-req-item input[type="checkbox"] {
  margin-top: 2px;
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-accent-cold);
  cursor: pointer;
}

.ai-act-req-body {
  flex: 1;
}

.ai-act-req-title {
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 0.15rem;
  line-height: 1.3;
}

.ai-act-req-article {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-accent-cold);
  margin-bottom: 0.3rem;
}

.ai-act-req-desc {
  font-size: 0.78rem;
  color: var(--color-muted);
  line-height: 1.55;
}

.ai-act-no-reqs {
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* ── Maturity levels grid ── */
.dimension-levels {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.dimension-level h4 {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent-cold);
  margin-top: 0;
  margin-bottom: 0.35rem;
}

.dimension-level ul {
  margin: 0;
  padding-left: 1rem;
  font-size: 0.8rem;
  color: var(--color-muted);
  line-height: 1.55;
  display: grid;
  gap: 0.2rem;
}

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .chapter-preview-block {
    grid-template-columns: 1fr;
  }

  .chapter-layout,
  .insight-strip,
  .dimension-grid,
  .principle-grid {
    grid-template-columns: 1fr;
  }

  .hero-block,
  .journey-block,
  .chapter-card,
  .method-block {
    padding: var(--space-md);
  }

  .ai-act-two-panel {
    grid-template-columns: 1fr;
  }

  .dimension-levels {
    grid-template-columns: 1fr;
  }
}