/*
  OSD Brand Bible — Shared Stylesheet
  Orchard Scotts Dental · Prepared by Kenneth Poh, CMO
  Version 1.0 · April 2026
  ─────────────────────────────────────────────────────
  Used by: OSD-Brand-Bible.html + Ch01–Ch11
*/

/* ============================================================
   1. CUSTOM PROPERTIES
   ============================================================ */
/* @tokens:start — GENERATED from osd-brand-kit.json by build_osd_tokens.py. Do not hand-edit; edit the kit + re-run */
:root {
  /* colours — generated from osd-brand-kit.json */
  --teal-50:#F3F5F5;
  --teal-100:#E2E8E8;
  --teal-200:#C5CFCF;
  --teal-300:#A8B5B5;
  --teal-400:#8A9A9A;
  --teal-500:#6A7A7A;
  --teal-600:#505B5C;
  --teal-700:#475152;
  --teal-800:#3A4748;
  --teal-900:#2D3536;
  --coral:#E07A5F;
  --coral-dark:#C96A50;
  --coral-light:#FEF2EE;
  --gold:#C9A962;
  --gold-light:#F7F3E8;
  --cream:#F5F1EA;
  --cream-deep:#EDE8DF;
  --surface:#FFFFFF;
  --neutral-900:#1A1A1A;
  --neutral-700:#4A4A4A;
  --neutral-500:#71717A;
  --neutral-400:#A1A1AA;
  --neutral-300:#CDD1D1;
  --ink:#1F1F1F;
  --muted:#6B6660;
  --rule:#D8CFBF;
  --gradient-skin:#C8A88A;
  --gradient-ember:#8A7060;
  --gradient-ground:#3E342B;
  /* aliases (legacy names downstream code references) */
  --teal:var(--teal-600); --teal-deep:var(--teal-800); --text-mid:var(--neutral-700);
  /* fonts */
  --font-display:"Noto Serif Display",Georgia,serif;
  --font-serif:"Noto Serif",Georgia,serif;
  --font-body:"Noto Sans",-apple-system,BlinkMacSystemFont,sans-serif;
  --font-mono:"SF Mono",Monaco,"Cascadia Code",monospace;
  --display:var(--font-display); --serif:var(--font-serif); --body:var(--font-body);
  /* named gradients */
  --grad-sphere-warm:radial-gradient(circle at 30% 30%, #C8A88A 0%, #8A7060 40%, #3E342B 100%);
  --grad-sphere-cool:radial-gradient(circle at 30% 30%, #B8A895 0%, #705A5A 40%, #2A2830 100%);
  --grad-sphere-bright:radial-gradient(circle at 30% 30%, #E0B896 0%, #A06850 40%, #422822 100%);
  --grad-photo-overlay-neutral:linear-gradient(180deg, rgba(42,38,34,0.15) 0%, rgba(42,38,34,0.55) 100%);
  --grad-photo-overlay-cool:linear-gradient(180deg, rgba(28,30,40,0.15) 0%, rgba(20,22,30,0.60) 100%);
  --grad-photo-overlay-warm:linear-gradient(180deg, rgba(42,30,24,0.12) 0%, rgba(42,28,22,0.55) 100%);
  --grad-page-cream:radial-gradient(ellipse at 14% 88%, rgba(80,91,92,0.10) 0%, transparent 48%), linear-gradient(138deg, #F5F1EA 0%, #E9DFCE 38%, #D4C6AE 100%);
  --grad-back-cover:linear-gradient(155deg, rgba(80,91,92,0.72) 0%, rgba(40,50,50,0.82) 100%);
  /* spacing */
  --space-xs:4px;
  --space-sm:8px;
  --space-md:16px;
  --space-lg:24px;
  --space-xl:32px;
  --space-2xl:48px;
  --space-3xl:64px;
  --space-4xl:96px;
  /* radius */
  --radius-sm:4px;
  --radius-md:6px;
  --radius-lg:8px;
  --radius-xl:12px;
}
/* @tokens:end */
/* layout — doc-specific, kept local (not brand canon) */
:root {
  --sidebar-w: 264px;
  --content-max: 760px;
  --mobile-header-h: 56px;
}

/* ============================================================
   2. RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--neutral-900);
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; border: none; background: none; }

/* ============================================================
   3. GRADIENT UTILITY
   ============================================================ */
.osd-gradient {
  background:
    linear-gradient(180deg, rgba(42,38,34,0.15) 0%, rgba(42,38,34,0.55) 100%),
    radial-gradient(circle at 30% 30%, var(--gradient-skin) 0%, var(--gradient-ember) 40%, var(--gradient-ground) 100%);
}

.osd-gradient-dusk {
  background:
    linear-gradient(180deg, rgba(28,30,40,0.15) 0%, rgba(20,22,30,0.60) 100%),
    radial-gradient(circle at 30% 30%, #B8A895 0%, #705A5A 40%, #2A2830 100%);
}

/* ============================================================
   4. LAYOUT
   ============================================================ */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ============================================================
   5. SIDEBAR
   ============================================================ */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--teal-900);
  border-right: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  z-index: 200;
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Custom scrollbar */
.sidebar::-webkit-scrollbar { width: 3px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 2px; }

.sidebar-top {
  padding: var(--space-xl) var(--space-lg) var(--space-md);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
}

.sidebar-brand-name {
  font-family: var(--font-serif);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cream);
  line-height: 1.45;
}

.sidebar-brand-sub {
  font-family: var(--font-body);
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(245,241,234,0.4);
  margin-top: 3px;
}

.sidebar-version {
  font-size: 10px;
  color: rgba(245,241,234,0.25);
  margin-top: 3px;
  letter-spacing: 0.04em;
}

/* Sidebar collapse button */
.sidebar-close-btn {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: rgba(245,241,234,0.45);
  transition: background 0.15s, color 0.15s;
  margin-top: 2px;
}

.sidebar-close-btn:hover {
  background: rgba(255,255,255,0.08);
  color: var(--cream);
}

.sidebar-nav {
  padding: var(--space-md) 0 var(--space-3xl);
  flex: 1;
}

.nav-section-label {
  font-family: var(--font-body);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(245,241,234,0.28);
  padding: var(--space-lg) var(--space-lg) var(--space-xs);
}

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px var(--space-lg);
  border-left: 2px solid transparent;
  transition: background 0.14s, border-color 0.14s;
}

.nav-link:hover {
  background: rgba(255,255,255,0.05);
}

.nav-link.active {
  background: rgba(224,122,95,0.12);
  border-left-color: var(--coral);
}

.nav-num {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
  color: rgba(245,241,234,0.28);
  min-width: 18px;
  flex-shrink: 0;
  letter-spacing: 0.04em;
}

.nav-text {
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 400;
  color: rgba(245,241,234,0.6);
  line-height: 1.4;
}

.nav-link:hover .nav-text { color: rgba(245,241,234,0.9); }
.nav-link:hover .nav-num  { color: rgba(245,241,234,0.5); }
.nav-link.active .nav-num  { color: var(--coral); }
.nav-link.active .nav-text { color: var(--cream); font-weight: 500; }

/* ============================================================
   6. SIDEBAR SHOW BUTTON (visible when sidebar is hidden, desktop)
   ============================================================ */
.sidebar-show-btn {
  position: fixed;
  left: 0;
  top: var(--space-xl);
  z-index: 150;
  width: 36px;
  height: 40px;
  background: var(--teal-900);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  display: none;  /* shown via JS when sidebar hidden */
  align-items: center;
  justify-content: center;
  color: rgba(245,241,234,0.7);
  box-shadow: 2px 0 8px rgba(0,0,0,0.15);
  transition: color 0.15s;
}

.sidebar-show-btn:hover {
  color: var(--cream);
}

/* ============================================================
   7. MAIN CONTENT AREA
   ============================================================ */
.main {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-width: 0;
  transition: margin-left 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   8. MOBILE OVERLAY
   ============================================================ */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 190;
  opacity: 0;
  transition: opacity 0.28s ease;
}

/* ============================================================
   9. MOBILE HEADER
   ============================================================ */
.mobile-header {
  display: none;
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--mobile-header-h);
  background: var(--teal-900);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 0 var(--space-md);
  align-items: center;
  gap: var(--space-md);
}

.mobile-menu-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: rgba(245,241,234,0.75);
  flex-shrink: 0;
  transition: background 0.14s;
}

.mobile-menu-btn:hover {
  background: rgba(255,255,255,0.08);
  color: var(--cream);
}

.mobile-header-title {
  flex: 1;
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cream);
}

.mobile-header-chapter {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--coral);
  flex-shrink: 0;
}

/* ============================================================
   10. COVER PAGE
   ============================================================ */
.cover {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-4xl);
  overflow: hidden;
}

.cover-rule {
  position: absolute;
  top: var(--space-4xl);
  left: var(--space-4xl);
  width: 48px;
  height: 2px;
  background: var(--coral);
}

.cover-edition {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(245,241,234,0.45);
  margin-bottom: var(--space-xl);
}

.cover-title {
  font-family: var(--font-display);
  font-size: clamp(52px, 6.5vw, 84px);
  font-weight: 300;
  line-height: 1.05;
  color: var(--cream);
  letter-spacing: -0.025em;
  margin-bottom: var(--space-xl);
  max-width: 680px;
}

.cover-title em { font-style: italic; }

.cover-descriptor {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 300;
  font-style: italic;
  color: rgba(245,241,234,0.6);
  max-width: 460px;
  line-height: 1.65;
  margin-bottom: var(--space-3xl);
}

.cover-meta {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.cover-meta-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.cover-meta-label {
  font-family: var(--font-body);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(245,241,234,0.28);
}

.cover-meta-value {
  font-family: var(--font-body);
  font-size: 12.5px;
  color: rgba(245,241,234,0.6);
}

.cover-meta-div {
  width: 1px;
  height: 30px;
  background: rgba(245,241,234,0.1);
}

.cover-toc {
  margin-top: var(--space-3xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid rgba(245,241,234,0.1);
}

.cover-toc-label {
  font-family: var(--font-body);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(245,241,234,0.3);
  margin-bottom: var(--space-lg);
}

.cover-toc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 2px;
}

.cover-toc-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: background 0.14s;
}

.cover-toc-item:hover {
  background: rgba(255,255,255,0.06);
}

.cover-toc-num {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  color: var(--coral);
  min-width: 22px;
  opacity: 0.8;
}

.cover-toc-text {
  font-family: var(--font-body);
  font-size: 13px;
  color: rgba(245,241,234,0.6);
  line-height: 1.4;
  transition: color 0.14s;
}

.cover-toc-item:hover .cover-toc-text {
  color: rgba(245,241,234,0.9);
}

/* ============================================================
   11. CHAPTER HEADER
   ============================================================ */
.chapter-header {
  padding: var(--space-4xl) var(--space-4xl) var(--space-3xl);
  border-bottom: 1px solid rgba(80,91,92,0.12);
  background: var(--cream);
}

.chapter-num {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: var(--space-md);
}

.chapter-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 4vw, 54px);
  font-weight: 300;
  line-height: 1.08;
  color: var(--teal-900);
  letter-spacing: -0.02em;
  max-width: 640px;
}

.chapter-title em { font-style: italic; }

.chapter-standfirst {
  font-family: var(--font-serif);
  font-size: 17.5px;
  font-weight: 300;
  font-style: italic;
  color: var(--teal-600);
  line-height: 1.65;
  max-width: 560px;
  margin-top: var(--space-lg);
}

/* ============================================================
   12. CHAPTER BODY
   ============================================================ */
.chapter-body {
  padding: var(--space-4xl);
}

/* ============================================================
   13. PLACEHOLDER CARD
   ============================================================ */
.chapter-placeholder {
  padding: var(--space-4xl);
}

.placeholder-card {
  border: 1.5px dashed var(--teal-200);
  border-radius: var(--radius-lg);
  padding: var(--space-3xl) var(--space-2xl);
  text-align: center;
  background: rgba(245,241,234,0.5);
  max-width: 500px;
  margin: 0 auto;
}

.placeholder-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--space-lg);
  color: var(--teal-300);
}

.placeholder-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 400;
  color: var(--teal-700);
  margin-bottom: var(--space-sm);
}

.placeholder-sub {
  font-family: var(--font-body);
  font-size: 13.5px;
  color: var(--neutral-500);
  line-height: 1.65;
}

/* ============================================================
   14. PROSE — EDITORIAL BODY
   ============================================================ */
.prose {
  max-width: var(--content-max);
}

.prose h2 {
  font-family: var(--font-serif);
  font-size: 27px;
  font-weight: 400;
  color: var(--teal-900);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-top: var(--space-4xl);
  margin-bottom: var(--space-lg);
}

.prose h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  color: var(--teal-800);
  line-height: 1.35;
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-md);
}

.prose h4 {
  font-family: var(--font-body);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--coral);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-sm);
}

.prose p {
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--neutral-700);
  margin-bottom: var(--space-lg);
}

.prose strong { font-weight: 600; color: var(--neutral-900); }
.prose em { font-style: italic; }

.prose ul, .prose ol {
  margin: 0 0 var(--space-lg) var(--space-xl);
}

.prose li {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  color: var(--neutral-700);
  margin-bottom: var(--space-sm);
}

/* Kicker */
.kicker {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: var(--space-sm);
}

/* Divider rule */
.rule {
  width: 40px;
  height: 1px;
  background: var(--teal-300);
  margin: var(--space-3xl) 0;
}

/* Pull quote */
.pull-quote {
  border-left: 2px solid var(--teal-600);
  padding: var(--space-lg) var(--space-2xl);
  margin: var(--space-3xl) 0;
  background: var(--cream-deep);
}

.pull-quote p {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 300;
  font-style: italic;
  color: var(--teal-900);
  line-height: 1.55;
  margin: 0;
}

.pull-quote cite {
  display: block;
  font-family: var(--font-body);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--coral);
  margin-top: var(--space-md);
  font-style: normal;
}

/* ============================================================
   15. STAT CARDS
   ============================================================ */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: var(--space-sm);
  margin: var(--space-3xl) 0;
}

.stat-card {
  background: var(--cream-deep);
  border: 1px solid rgba(80,91,92,0.1);
  padding: var(--space-xl) var(--space-md);
  text-align: center;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 300;
  color: var(--teal-900);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat-label {
  font-family: var(--font-body);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal-500);
  margin-top: var(--space-sm);
  line-height: 1.4;
}

/* ============================================================
   16. PILLAR CARDS
   ============================================================ */
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin: var(--space-3xl) 0;
}

.pillar-card {
  padding: var(--space-2xl) var(--space-xl);
  border: 1px solid rgba(80,91,92,0.12);
  background: var(--cream);
  position: relative;
}

.pillar-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--coral);
}

.pillar-num {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: var(--space-md);
}

.pillar-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  color: var(--teal-900);
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

.pillar-desc {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.68;
  color: var(--neutral-700);
}

/* ============================================================
   17. DIFFERENTIATOR CARDS
   ============================================================ */
.diff-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin: var(--space-3xl) 0;
}

.diff-card {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background: var(--cream);
  border: 1px solid rgba(80,91,92,0.1);
}

.diff-num {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 300;
  color: var(--teal-200);
  line-height: 1;
  text-align: right;
  padding-top: 3px;
}

.diff-title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 500;
  color: var(--teal-900);
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}

.diff-body {
  font-family: var(--font-body);
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--neutral-700);
}

/* ============================================================
   18. DATA TABLE
   ============================================================ */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-2xl) 0;
  font-size: 14px;
}

.data-table thead th {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal-600);
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--teal-200);
  background: var(--cream-deep);
}

.data-table tbody td {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--neutral-700);
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid rgba(80,91,92,0.07);
  vertical-align: top;
  line-height: 1.58;
}

.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover td { background: rgba(245,241,234,0.5); }

/* ============================================================
   19. PROHIBITION / COMPLIANCE ITEMS
   ============================================================ */
.rule-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin: var(--space-2xl) 0;
}

.rule-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border: 1px solid rgba(224,122,95,0.18);
  border-left: 3px solid var(--coral);
  background: #FFF6F4;
}

.rule-item--ok {
  border-color: rgba(74,222,128,0.18);
  border-left-color: #4ade80;
  background: #F4FBF6;
}

.rule-icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 3px;
  color: var(--coral);
}

.rule-item--ok .rule-icon { color: #4ade80; }

.rule-text {
  font-family: var(--font-body);
  font-size: 14.5px;
  color: var(--neutral-900);
  line-height: 1.58;
}

.rule-text strong { font-weight: 600; }

/* ============================================================
   20. PERSON CARDS
   ============================================================ */
.person-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
  margin: var(--space-2xl) 0;
}

.person-card {
  padding: var(--space-xl);
  border: 1px solid rgba(80,91,92,0.1);
  background: var(--cream);
}

.person-role {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--coral);
  margin-bottom: var(--space-sm);
}

.person-name {
  font-family: var(--font-serif);
  font-size: 16.5px;
  font-weight: 500;
  color: var(--teal-900);
  line-height: 1.3;
  margin-bottom: var(--space-xs);
}

.person-specialty {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--neutral-500);
  line-height: 1.55;
}

/* ============================================================
   21. CHANNEL CARDS
   ============================================================ */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: var(--space-md);
  margin: var(--space-2xl) 0;
}

.channel-card {
  padding: var(--space-lg);
  border: 1px solid rgba(80,91,92,0.1);
  background: var(--cream);
}

.channel-name {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  color: var(--teal-700);
  margin-bottom: var(--space-xs);
}

.channel-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
}

.channel-badge.editorial { background: var(--coral-light); color: var(--coral-dark); }
.channel-badge.functional { background: var(--teal-50); color: var(--teal-600); }

.channel-desc {
  font-family: var(--font-body);
  font-size: 12.5px;
  color: var(--neutral-500);
  line-height: 1.58;
}

/* ============================================================
   22. COLOUR SWATCHES
   ============================================================ */
.swatch-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin: var(--space-2xl) 0;
}

.swatch { display: flex; flex-direction: column; width: 90px; }
.swatch-block { height: 52px; width: 100%; }
.swatch-name { font-family: var(--font-body); font-size: 10px; font-weight: 700; letter-spacing: 0.08em; color: var(--neutral-700); margin-top: var(--space-xs); }
.swatch-hex  { font-family: var(--font-mono); font-size: 10px; color: var(--neutral-500); }

/* ============================================================
   23. FOOTER
   ============================================================ */
.doc-footer {
  padding: var(--space-3xl) var(--space-4xl);
  border-top: 1px solid rgba(80,91,92,0.12);
  background: var(--teal-900);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}

.doc-footer-brand {
  font-family: var(--font-serif);
  font-size: 14px;
  color: rgba(245,241,234,0.65);
  line-height: 1.55;
}

.doc-footer-meta {
  font-family: var(--font-body);
  font-size: 11px;
  color: rgba(245,241,234,0.3);
  line-height: 1.75;
  text-align: right;
}

/* ============================================================
   24. SIDEBAR HIDDEN STATE (desktop toggle)
   ============================================================ */
body.sidebar-hidden .sidebar {
  transform: translateX(calc(-1 * var(--sidebar-w)));
}

body.sidebar-hidden .main {
  margin-left: 0;
}

body.sidebar-hidden .sidebar-show-btn {
  display: flex;
}

/* ============================================================
   25. MOBILE RESPONSIVE (≤ 900px)
   ============================================================ */
@media (max-width: 900px) {
  .sidebar {
    transform: translateX(calc(-1 * var(--sidebar-w)));
    top: 0;
    box-shadow: 4px 0 24px rgba(0,0,0,0.25);
    z-index: 300;
  }

  .sidebar-close-btn { display: flex; }

  .mobile-header { display: flex; }

  .main {
    margin-left: 0;
    padding-top: 0;
  }

  .sidebar-show-btn { display: none !important; }

  .sidebar-backdrop { display: block; }

  /* Open state */
  body.mobile-menu-open .sidebar {
    transform: translateX(0);
  }

  body.mobile-menu-open .sidebar-backdrop {
    opacity: 1;
    pointer-events: all;
  }

  body.mobile-menu-open {
    overflow: hidden;
  }

  /* Content padding adjustments */
  .cover,
  .chapter-header,
  .chapter-body,
  .chapter-placeholder {
    padding-left: var(--space-xl);
    padding-right: var(--space-xl);
  }

  .cover { padding-bottom: var(--space-3xl); min-height: 90vh; }
  .cover-rule { left: var(--space-xl); }

  .chapter-header { padding-top: var(--space-3xl); }

  .doc-footer {
    padding: var(--space-2xl) var(--space-xl);
    flex-direction: column;
    gap: var(--space-md);
  }

  .doc-footer-meta { text-align: left; }
}

@media (max-width: 600px) {
  :root { --space-4xl: 64px; }

  .cover-title { font-size: 42px; }
  .chapter-title { font-size: 30px; }

  .pillar-grid { grid-template-columns: 1fr; }
  .stat-grid   { grid-template-columns: repeat(2, 1fr); }

  .cover-toc-grid { grid-template-columns: 1fr; }

  .diff-card {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .diff-num { text-align: left; font-size: 22px; }

  .prose p, .prose li { font-size: 15.5px; }

  .data-table { font-size: 13px; }
  .data-table thead th { font-size: 9px; }
}

/* ============================================================
   26. SMOOTH TRANSITIONS
   ============================================================ */
.sidebar,
.main,
.sidebar-show-btn {
  will-change: transform;
}

/* Desktop: no mobile-sidebar logic */
@media (min-width: 901px) {
  .sidebar-backdrop { display: none !important; }
  .mobile-header    { display: none !important; }
}