/* ═══════════════════════════════════════
   DESIGN TOKENS
═══════════════════════════════════════ */
:root {
  /* Neutrals */
  --ink:       #111111;
  --ink-2:     #2e2e2e;
  --ink-3:     #525252;
  --ink-4:     #737373;
  --line:      #e8e8e8;
  --line-2:    #d1d1d1;
  --surface:   #ffffff;
  --surface-2: #f9f9f9;
  --surface-3: #f3f3f3;

  /* Red — rules, principles, urgency */
  --red:       #c0392b;
  --red-dk:    #922b21;
  --red-lt:    #fef5f5;
  --red-bd:    #f5c6c2;

  /* Amber — insights, notable observations */
  --amb:       #b45309;
  --amb-lt:    #fffcf0;
  --amb-bd:    #fde68a;

  /* Blue — reflection, introspection */
  --blu:       #1e4d7b;
  --blu-lt:    #f0f5fb;
  --blu-bd:    #bfcfe8;

  /* Green — exercises, action */
  --grn:       #1a6b3a;
  --grn-lt:    #f2fbf5;
  --grn-bd:    #a7ddb9;

  /* Type */
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --serif: 'Lora', Georgia, 'Times New Roman', serif;

  --gap: 88px;
}

/* ═══════════════════════════════════════
   RESET
═══════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--surface);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.82;
  -webkit-font-smoothing: antialiased;
}

/* ═══════════════════════════════════════
   HEADER
═══════════════════════════════════════ */
.site-header {
  background: var(--ink);
  padding: 80px 32px 64px;
  text-align: center;
  position: relative;
}
.site-header::after {
  content: '';
  display: block;
  height: 3px;
  background: linear-gradient(90deg, transparent 0%, var(--red) 25%, var(--red) 75%, transparent 100%);
  position: absolute;
  bottom: 0; left: 0; right: 0;
}
.header-kicker {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 22px;
}
.header-title {
  font-family: var(--sans);
  font-size: clamp(30px, 5.5vw, 54px);
  font-weight: 800;
  letter-spacing: -0.035em;
  color: #ffffff;
  line-height: 1.06;
  margin-bottom: 18px;
}
.header-sub {
  font-family: var(--serif);
  font-style: italic;
  font-size: 17.5px;
  color: #999;
  max-width: 540px;
  margin: 0 auto 36px;
  line-height: 1.65;
}
.source-row {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}
.source-chip {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  color: #888;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  padding: 4px 12px;
  border-radius: 100px;
  letter-spacing: 0.02em;
}

/* ═══════════════════════════════════════
   NAV
═══════════════════════════════════════ */
.site-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px -4px rgba(0,0,0,0.08);
}
.nav-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}
.nav-inner a {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-4);
  text-decoration: none;
  padding: 5px 11px;
  border-radius: 6px;
  transition: background 0.1s, color 0.1s;
  white-space: nowrap;
}
.nav-inner a:hover { background: var(--surface-3); color: var(--ink); }

/* ═══════════════════════════════════════
   PAGE LAYOUT
═══════════════════════════════════════ */
.page-body {
  max-width: 740px;
  margin: 0 auto;
  padding: 80px 32px 120px;
}

/* ═══════════════════════════════════════
   INTRO (before numbered sections)
═══════════════════════════════════════ */
.intro-block {
  padding-bottom: 64px;
  border-bottom: 1px solid var(--line);
  margin-bottom: var(--gap);
}
.intro-block p {
  color: var(--ink-2);
  font-size: 19px;
  line-height: 1.85;
  margin-bottom: 20px;
}
.intro-block p:last-child { margin-bottom: 0; }
.intro-block strong { color: var(--ink); }

/* ═══════════════════════════════════════
   CHAPTER / SECTION
═══════════════════════════════════════ */
.chapter {
  padding-top: var(--gap);
  border-top: 1px solid var(--line);
  margin-top: var(--gap);
}
.chapter:first-of-type {
  padding-top: 0;
  border-top: none;
  margin-top: 0;
}
.ch-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}
.ch-num {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--red);
}
.ch-tag {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-4);
}
h2.ch-title {
  font-family: var(--sans);
  font-size: clamp(22px, 3.5vw, 30px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.15;
  margin-bottom: 22px;
}
h3 {
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin: 40px 0 10px;
  letter-spacing: -0.01em;
}
p {
  color: var(--ink-2);
  margin-bottom: 18px;
}
p:last-child { margin-bottom: 0; }
strong { color: var(--ink); font-weight: 600; }
em { font-style: italic; }

/* ═══════════════════════════════════════
   CALLOUT BOXES
═══════════════════════════════════════ */

/* Principle — red, rules, must-know */
.principle {
  margin: 28px 0;
  padding: 20px 24px;
  background: var(--red-lt);
  border: 1px solid var(--red-bd);
  border-left: 4px solid var(--red);
  border-radius: 0 8px 8px 0;
}
.callout-label {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.principle .callout-label { color: var(--red-dk); }
.principle p { color: var(--ink-2); font-size: 16.5px; line-height: 1.7; margin: 0; }

/* Insight — amber, notable observations */
.insight {
  margin: 28px 0;
  padding: 20px 24px;
  background: var(--amb-lt);
  border: 1px solid var(--amb-bd);
  border-left: 4px solid var(--amb);
  border-radius: 0 8px 8px 0;
}
.insight .callout-label { color: var(--amb); }
.insight p { color: var(--ink-2); font-size: 16.5px; line-height: 1.7; margin: 0; }

/* Note — reuses insight style, no separate class needed */
.note {
  margin: 28px 0;
  padding: 20px 24px;
  background: var(--surface-2);
  border: 1px solid var(--line-2);
  border-left: 4px solid var(--line-2);
  border-radius: 0 8px 8px 0;
}
.note .callout-label { color: var(--ink-4); }
.note p { color: var(--ink-3); font-size: 16px; line-height: 1.65; margin: 0; }

/* Pull quote */
blockquote {
  margin: 36px 0;
  padding: 26px 30px;
  background: var(--surface-2);
  border-left: 3px solid var(--red);
  border-radius: 0 8px 8px 0;
}
blockquote p {
  font-family: var(--serif);
  font-style: italic;
  font-size: 19.5px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 10px;
}
blockquote cite {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-4);
  font-style: normal;
}

/* ═══════════════════════════════════════
   REFLECT BOX (blue — introspective)
═══════════════════════════════════════ */
.reflect {
  margin: 48px 0 4px;
  background: var(--blu-lt);
  border: 1px solid var(--blu-bd);
  border-radius: 10px;
  padding: 26px 30px 22px;
}
.reflect-hd {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}
.reflect-badge {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blu);
}
.reflect ol {
  list-style: none;
  counter-reset: rq;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.reflect ol li {
  counter-increment: rq;
  display: flex;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--blu-bd);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
  align-items: flex-start;
}
.reflect ol li:last-child { border-bottom: none; padding-bottom: 0; }
.reflect ol li::before {
  content: counter(rq);
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  margin-top: 1px;
  background: var(--blu);
  color: #fff;
  border-radius: 50%;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ═══════════════════════════════════════
   EXERCISE BOX (green — action)
═══════════════════════════════════════ */
.exercise {
  margin: 28px 0;
  background: var(--grn-lt);
  border: 1px solid var(--grn-bd);
  border-radius: 10px;
  padding: 24px 28px;
}
.exercise-hd {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.exercise-badge {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--grn);
}
.exercise p {
  font-size: 16px;
  color: var(--ink-2);
  margin-bottom: 10px;
  line-height: 1.65;
}
.exercise p:last-child { margin-bottom: 0; }

/* ═══════════════════════════════════════
   LISTS
═══════════════════════════════════════ */

/* SR Cards — 2-column grid on desktop */
.sr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 22px 0;
}
.sr-card {
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  align-items: flex-start;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
}
.sr-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}
.sr-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: var(--red);
  color: #fff;
  border-radius: 50%;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}

/* Numbered list */
.num-list {
  list-style: none;
  counter-reset: nl;
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.num-list li {
  counter-increment: nl;
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-2);
  align-items: flex-start;
}
.num-list li::before {
  content: counter(nl, decimal-leading-zero);
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  color: var(--red);
  min-width: 22px;
  padding-top: 3px;
  flex-shrink: 0;
  letter-spacing: 0.05em;
}

/* Action list — replaces low-contrast checkboxes */
.action-list {
  list-style: none;
  margin: 14px 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.action-list li {
  display: flex;
  gap: 12px;
  padding: 9px 14px;
  font-size: 16px;
  color: var(--ink-2);
  line-height: 1.55;
  border-radius: 6px;
  align-items: flex-start;
  transition: background 0.1s;
}
.action-list li:hover { background: var(--surface-3); }
.action-list li::before {
  content: '→';
  color: var(--red);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ═══════════════════════════════════════
   GRIDS
═══════════════════════════════════════ */
.phase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  margin: 24px 0;
}
.phase-cell {
  padding: 20px 16px;
  border-right: 1px solid var(--line);
  background: var(--surface);
}
.phase-cell:nth-child(even) { background: var(--surface-2); }
.phase-cell:last-child { border-right: none; }
.phase-num {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 6px;
}
.phase-cell h5 {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}
.phase-cell p { font-size: 13px; line-height: 1.55; color: var(--ink-3); margin: 0; }

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 18px 0;
}
.fact-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 18px;
}
.fact-card .fc-label {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 6px;
}
.fact-card p { font-size: 15px; color: var(--ink-3); margin: 0; line-height: 1.55; }

.zone-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 20px 0;
}
.zone-card {
  padding: 18px 16px;
  border-radius: 8px;
  text-align: center;
}
.zone-card.green { background: var(--grn-lt); border: 1px solid var(--grn-bd); }
.zone-card.amber { background: var(--amb-lt); border: 1px solid var(--amb-bd); }
.zone-card.red   { background: var(--red-lt); border: 1px solid var(--red-bd); }
.zone-card h5 {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.zone-card.green h5 { color: var(--grn); }
.zone-card.amber h5 { color: var(--amb); }
.zone-card.red   h5 { color: var(--red); }
.zone-card p { font-size: 13px; color: var(--ink-3); margin: 0; line-height: 1.5; }

.theme-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 18px 0;
}
.theme-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 20px;
}
.theme-card .tc-num {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  color: var(--red);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 5px;
}
.theme-card h5 {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 7px;
}
.theme-card p { font-size: 14px; color: var(--ink-3); margin: 0; line-height: 1.55; }

/* ═══════════════════════════════════════
   TRACTION SVG
═══════════════════════════════════════ */
.traction-wrap {
  margin: 32px auto;
  max-width: 300px;
}

/* ═══════════════════════════════════════
   FURTHER READING
═══════════════════════════════════════ */
.reading-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 20px 0;
}
.book-card {
  padding: 16px 18px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.book-card .book-title {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 3px;
}
.book-card .book-author {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-4);
  margin-bottom: 8px;
}
.book-card p { font-size: 13.5px; color: var(--ink-3); margin: 0; line-height: 1.55; }

/* ═══════════════════════════════════════
   FOOTER
═══════════════════════════════════════ */
footer {
  background: var(--ink);
  color: #555;
  text-align: center;
  padding: 40px 24px;
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.03em;
  border-top: 3px solid var(--red);
}
footer strong { color: #999; }
footer a { color: #666; text-decoration: none; }
footer a:hover { color: #999; }

/* ═══════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════ */
@media (max-width: 640px) {
  .page-body { padding: 48px 20px 80px; }
  .phase-grid { grid-template-columns: 1fr 1fr; }
  .sr-grid, .two-col, .zone-grid, .theme-grid, .reading-grid { grid-template-columns: 1fr; }
  .sr-card:last-child:nth-child(odd) { grid-column: auto; }
  .site-nav { display: none; }
  :root { --gap: 60px; }
}

/* ═══════════════════════════════════════
   MULTI-PAGE ADDITIONS
═══════════════════════════════════════ */

/* Chapter header (compact — used on chapter pages) */
.chapter-header {
  padding: 52px 32px 40px;
}
.chapter-header .header-title {
  font-size: clamp(24px, 4vw, 40px);
}
.chapter-meta-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  margin-top: 16px;
}
.ch-num-lg {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--red);
}
.ch-tag-lg {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #666;
}
.ch-sep { color: #444; font-size: 10px; }

/* Nav home link */
.nav-home {
  font-weight: 700 !important;
  color: var(--red) !important;
}
.nav-home:hover { background: var(--red-lt) !important; color: var(--red-dk) !important; }
.nav-inner a.nav-active {
  background: var(--red-lt);
  color: var(--red);
  font-weight: 600;
}

/* Chapter prev/next nav */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 12px;
  margin-top: 72px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.chapter-nav a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-decoration: none;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  flex: 1;
  max-width: 240px;
  transition: all 0.15s;
  background: var(--surface);
}
.chapter-nav a:hover {
  background: var(--surface-2);
  border-color: var(--line-2);
  box-shadow: 0 3px 12px -4px rgba(0,0,0,0.1);
  transform: translateY(-1px);
}
.chapter-nav .cn-dir {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.chapter-nav .cn-title {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.3;
}
.chapter-nav .cn-tag {
  font-family: var(--sans);
  font-size: 11px;
  color: var(--ink-4);
}
.chapter-nav a.next { text-align: right; margin-left: auto; }
.chapter-nav-spacer { flex: 1; }

/* ═══════════════════════════════════════
   INDEX PAGE TOC GRID
═══════════════════════════════════════ */
.toc-intro {
  padding-bottom: 56px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 52px;
}
.toc-intro p {
  color: var(--ink-2);
  font-size: 19px;
  line-height: 1.85;
  margin-bottom: 20px;
}
.toc-intro p:last-child { margin-bottom: 0; }
.toc-intro strong { color: var(--ink); }

.toc-section-label {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 16px;
}
.toc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 0 0 48px;
}
.toc-card {
  display: flex;
  gap: 14px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.15s;
  align-items: flex-start;
}
.toc-card:hover {
  background: var(--surface-2);
  border-color: var(--line-2);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px -4px rgba(0,0,0,0.08);
}
.toc-num {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  color: var(--red);
  min-width: 24px;
  padding-top: 2px;
  flex-shrink: 0;
}
.toc-info { flex: 1; min-width: 0; }
.toc-title {
  font-family: var(--sans);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
  display: block;
  margin-bottom: 3px;
  line-height: 1.3;
}
.toc-tag {
  font-family: var(--sans);
  font-size: 11px;
  color: var(--ink-4);
  display: block;
}

/* ═══════════════════════════════════════
   DIAGRAMS
═══════════════════════════════════════ */
.diagram {
  margin: 36px 0;
  text-align: center;
}
.diagram svg {
  max-width: 340px;
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 12px;
  border-radius: 8px;
}
.diagram.diagram-wide svg {
  max-width: 560px;
}
.diagram figcaption {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-4);
  margin-bottom: 10px;
}
.diagram-note {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-3);
  line-height: 1.55;
  max-width: 520px;
  margin: 0 auto !important;
  text-align: left;
}

@media (max-width: 640px) {
  .toc-grid { grid-template-columns: 1fr; }
  .chapter-nav { flex-direction: column; }
  .chapter-nav a { max-width: 100%; }
  .diagram.diagram-wide svg { max-width: 100%; }
}