/* ============================================
   AI KNOWLEDGE BANK — Page Styles
   Warm scholarly accent · dark editorial · mobile responsive
   ============================================ */

:root {
  --kb-bg:      #2A2014;
  --kb-bg-deep: #1E1810;
  --kb-t:       #E8B468;
  --kb-t-soft:  #F0C58A;
  --kb-bd:      #C28A40;
  --kb-bd-soft: rgba(194, 138, 64, 0.36);
  --kb-bd-faint:rgba(194, 138, 64, 0.16);
  --kb-glow:    rgba(232, 180, 104, 0.10);
}

/* ============================================
   HERO
   ============================================ */
.kb-hero { padding: 160px 0 70px; position: relative; }
.kb-hero-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--kb-t); margin-bottom: 18px;
}
.kb-hero-title {
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700; line-height: 1.05;
  letter-spacing: -0.03em; color: var(--text);
  margin-bottom: 18px;
}
.kb-hero-title em { font-style: normal; color: var(--kb-t); }
.kb-hero-subtitle {
  font-size: 18px; font-weight: 400; line-height: 1.6;
  color: var(--text-secondary);
  max-width: 640px; margin-bottom: 22px;
}
.kb-hero-body {
  font-size: 15.5px; line-height: 1.75;
  color: var(--text-tertiary);
  max-width: 620px; margin-bottom: 28px;
}
.kb-hero-cta {
  display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px;
}
.kb-btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; letter-spacing: 0.06em;
  text-transform: uppercase; font-weight: 600;
  padding: 10px 16px; border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-alt); color: var(--text);
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease, transform 0.12s ease;
}
.kb-btn:hover { background: var(--surface); border-color: var(--kb-bd-soft); color: var(--kb-t); }
.kb-btn--primary {
  background: var(--kb-bg); border-color: var(--kb-bd-soft); color: var(--kb-t);
}
.kb-btn--primary:hover { background: var(--kb-bg-deep); border-color: var(--kb-bd); }
.kb-btn:active { transform: translateY(1px); }
.kb-btn:focus-visible { outline: 2px solid var(--kb-bd); outline-offset: 2px; }

.kb-hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px; max-width: 760px;
}
.kb-hero-stat {
  background: var(--bg-alt);
  border: 1px solid var(--border-light);
  border-left: 2px solid var(--kb-bd-soft);
  border-radius: 10px; padding: 12px 14px;
}
.kb-hero-stat-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px; font-weight: 700;
  color: var(--kb-t); margin-bottom: 2px;
  font-variant-numeric: tabular-nums;
}
.kb-hero-stat-label { font-size: 11.5px; color: var(--text-tertiary); }

/* ============================================
   SECTION SHELL
   ============================================ */
.kb-section { padding: 60px 0; position: relative; }
.kb-section + .kb-section { padding-top: 30px; }
.kb-section-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--kb-t); margin-bottom: 12px;
}
.kb-section-title {
  font-size: clamp(24px, 3.4vw, 30px);
  font-weight: 700; line-height: 1.15;
  color: var(--text); letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.kb-section-sub {
  font-size: 15px; line-height: 1.65;
  color: var(--text-tertiary);
  max-width: 720px; margin-bottom: 24px;
}

/* ============================================
   HOW IT WORKS — pipeline cards
   ============================================ */
.kb-how {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px; margin-top: 12px;
}
.kb-how-card {
  background: var(--bg-alt); border: 1px solid var(--border-light);
  border-radius: 12px; padding: 14px 16px;
}
.kb-how-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.16em;
  color: var(--kb-t); margin-bottom: 6px;
}
.kb-how-h {
  font-size: 14.5px; font-weight: 700; color: var(--text);
  margin-bottom: 4px; letter-spacing: -0.005em;
}
.kb-how-d { font-size: 12.5px; line-height: 1.6; color: var(--text-tertiary); margin: 0; }

/* ============================================
   BOOKS LIBRARY — featured book card + coming-next grid
   ============================================ */
.kb-books { display: grid; grid-template-columns: 1fr; gap: 18px; }
.kb-book {
  background: linear-gradient(180deg, rgba(194, 138, 64, 0.05), transparent 70%), var(--bg-alt);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--kb-bd);
  border-radius: 14px; padding: 24px 26px;
  display: grid; grid-template-columns: 1fr; gap: 14px;
}
.kb-book-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--kb-t); font-weight: 700;
}
.kb-book-h {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 700; color: var(--text);
  letter-spacing: -0.01em; margin: 0;
}
.kb-book-byline { font-size: 14px; color: var(--text-secondary); margin: 0; }
.kb-book-desc {
  font-size: 14px; line-height: 1.7;
  color: var(--text-tertiary);
  max-width: 720px; margin: 0;
}
.kb-book-meta {
  display: flex; flex-wrap: wrap; gap: 8px;
  font-family: 'JetBrains Mono', monospace; font-size: 10.5px;
}
.kb-book-pill {
  background: var(--bg);
  border: 1px solid var(--kb-bd-faint);
  border-radius: 999px; padding: 4px 10px;
  color: var(--kb-t);
}
.kb-book-pill--status {
  background: rgba(152, 216, 158, 0.06);
  border-color: rgba(152, 216, 158, 0.34);
  color: #98D89E;
}
.kb-book-cta { display: flex; gap: 10px; flex-wrap: wrap; }

.kb-coming {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px; margin-top: 8px;
}
.kb-coming-card {
  background: var(--bg-alt);
  border: 1px dashed var(--border);
  border-radius: 10px; padding: 14px 16px;
  opacity: 0.78;
}
.kb-coming-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px; letter-spacing: 0.16em;
  color: var(--text-tertiary); margin-bottom: 4px;
}
.kb-coming-h { font-size: 14px; font-weight: 700; color: var(--text); margin: 0 0 4px; }
.kb-coming-d { font-size: 11.5px; color: var(--text-tertiary); margin: 0; }
.kb-coming-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--kb-t);
  margin-top: 6px;
}

/* ============================================
   MASTER MAP — 7 expandable phase rows
   ============================================ */
.kb-phases { display: grid; grid-template-columns: 1fr; gap: 10px; }
.kb-phase {
  background: var(--bg-alt);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--kb-bd-soft);
  border-radius: 12px; padding: 16px 18px;
  transition: border-color 0.18s ease, background 0.18s ease;
}
.kb-phase.is-open {
  background: var(--surface);
  border-color: var(--kb-bd);
  border-left-color: var(--kb-bd);
}
.kb-phase-head {
  display: grid;
  grid-template-columns: 76px 1fr auto;
  gap: 14px; align-items: center;
  cursor: pointer;
}
.kb-phase-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; font-weight: 700;
  color: var(--kb-t);
  background: rgba(194, 138, 64, 0.14);
  border: 1px solid var(--kb-bd-faint);
  border-radius: 6px; padding: 6px 10px; text-align: center;
}
.kb-phase-title { font-size: 16px; font-weight: 700; color: var(--text); margin: 0; letter-spacing: -0.005em; }
.kb-phase-sub { font-size: 12.5px; color: var(--text-tertiary); margin-top: 2px; }
.kb-phase-arrow {
  color: var(--text-tertiary);
  font-family: 'JetBrains Mono', monospace; font-size: 14px;
  transition: transform 0.2s ease, color 0.18s ease;
}
.kb-phase.is-open .kb-phase-arrow { transform: rotate(90deg); color: var(--kb-t); }

.kb-phase-body {
  margin-top: 14px; padding-top: 14px;
  border-top: 1px solid var(--border-light);
  display: none;
}
.kb-phase.is-open .kb-phase-body { display: block; }
.kb-phase-section { margin-bottom: 12px; }
.kb-phase-section:last-child { margin-bottom: 0; }
.kb-phase-section-h {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--kb-t); font-weight: 700;
  margin-bottom: 5px;
}
.kb-phase-section-d {
  font-size: 13px; line-height: 1.65;
  color: var(--text-secondary); margin: 0;
}
.kb-phase-list {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 4px;
}
.kb-phase-list li {
  font-size: 12.5px; color: var(--text-secondary);
  line-height: 1.6; padding-left: 14px;
  position: relative;
}
.kb-phase-list li::before {
  content: '·'; position: absolute; left: 0;
  color: var(--kb-t); font-weight: 700;
}
.kb-phase-pills {
  display: flex; flex-wrap: wrap; gap: 5px;
}
.kb-phase-pill {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  background: var(--bg); border: 1px solid var(--border-light);
  border-radius: 4px; padding: 3px 8px;
  color: var(--text-tertiary);
}
.kb-phase-cta {
  display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px;
}

/* ============================================
   DOMAINS — taxonomy grid
   ============================================ */
.kb-domains {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}
.kb-domain {
  background: var(--bg-alt);
  border: 1px solid var(--border-light);
  border-radius: 12px; padding: 14px 16px;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.12s ease;
  text-align: left;
  font-family: inherit;
  display: flex; flex-direction: column; gap: 5px;
}
.kb-domain:hover {
  background: var(--surface);
  border-color: var(--kb-bd-soft);
  transform: translateY(-1px);
}
.kb-domain.is-active {
  background: var(--kb-bg);
  border-color: var(--kb-bd);
}
.kb-domain-label {
  font-size: 13.5px; font-weight: 700; color: var(--text);
  letter-spacing: -0.005em;
}
.kb-domain-short {
  font-size: 11.5px; color: var(--text-tertiary); line-height: 1.5;
}
.kb-domain-meta {
  display: flex; gap: 6px; flex-wrap: wrap;
  font-family: 'JetBrains Mono', monospace; font-size: 10px;
  color: var(--text-tertiary);
}
.kb-domain-count { color: var(--kb-t); font-weight: 700; }

/* ============================================
   MODE TABS
   ============================================ */
.kb-modes {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 12px;
}
.kb-mode {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 8px 14px; border-radius: 8px;
  border: 1px solid var(--border-light);
  background: var(--bg-alt); color: var(--text-tertiary);
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.kb-mode:hover { color: var(--text); border-color: var(--kb-bd-soft); }
.kb-mode.is-active {
  background: var(--kb-bg); border-color: var(--kb-bd); color: var(--kb-t);
}
.kb-mode:focus-visible { outline: 2px solid var(--kb-bd); outline-offset: 2px; }

/* ============================================
   FILTERS
   ============================================ */
.kb-filters { display: grid; grid-template-columns: 1fr; gap: 10px; margin-bottom: 18px; }
.kb-filters-row {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
}
.kb-search {
  flex: 1 1 260px; min-width: 220px;
  padding: 10px 14px; font-size: 14px;
  color: var(--text);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px; font-family: inherit;
}
.kb-search::placeholder { color: var(--text-tertiary); }
.kb-search:focus { outline: 2px solid var(--kb-bd); outline-offset: 2px; }
.kb-select {
  padding: 9px 12px; font-size: 12.5px;
  color: var(--text);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace; cursor: pointer;
}
.kb-select:focus { outline: 2px solid var(--kb-bd); outline-offset: 2px; }

.kb-toggles { display: flex; flex-wrap: wrap; gap: 6px; }
.kb-toggle {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.04em; font-weight: 600;
  padding: 6px 11px; border-radius: 999px;
  border: 1px solid var(--border-light);
  background: var(--bg-alt); color: var(--text-tertiary);
  cursor: pointer;
  transition: background 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}
.kb-toggle:hover { color: var(--text); border-color: var(--kb-bd-soft); }
.kb-toggle.is-active {
  background: rgba(194, 138, 64, 0.12);
  border-color: var(--kb-bd); color: var(--kb-t);
}

.kb-result-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px; color: var(--text-tertiary);
  margin-bottom: 12px;
}

/* ============================================
   PROGRESS SUMMARY
   ============================================ */
.kb-progress {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}
.kb-progress-card {
  background: var(--bg-alt);
  border: 1px solid var(--border-light);
  border-left: 2px solid var(--kb-bd-soft);
  border-radius: 10px;
  padding: 10px 14px;
}
.kb-progress-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 18px; font-weight: 700;
  color: var(--kb-t);
  font-variant-numeric: tabular-nums;
  margin-bottom: 2px;
}
.kb-progress-label {
  font-size: 11px;
  color: var(--text-tertiary);
  letter-spacing: 0.06em;
}

/* ============================================
   PAGINATION ("load more")
   ============================================ */
.kb-loadmore {
  display: flex;
  justify-content: center;
  margin-top: 16px;
}
.kb-loadmore-btn {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; letter-spacing: 0.06em;
  text-transform: uppercase; font-weight: 600;
  padding: 10px 20px;
  border-radius: 8px;
  border: 1px solid var(--kb-bd-soft);
  background: var(--kb-bg);
  color: var(--kb-t);
  cursor: pointer;
  transition: background 0.16s ease, border-color 0.16s ease;
}
.kb-loadmore-btn:hover {
  background: var(--kb-bg-deep);
  border-color: var(--kb-bd);
}

/* ============================================
   QUESTION CARDS
   ============================================ */
.kb-domain-block { margin-bottom: 36px; }
.kb-domain-block-h {
  display: flex; align-items: baseline; gap: 10px;
  font-size: 18px; font-weight: 700; color: var(--text);
  margin-bottom: 10px; letter-spacing: -0.01em;
}
.kb-domain-block-h-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; font-weight: 700; color: var(--kb-t);
  background: rgba(194, 138, 64, 0.14);
  border: 1px solid var(--kb-bd-faint);
  border-radius: 5px; padding: 2px 7px;
}
.kb-domain-block-sub { font-size: 12.5px; color: var(--text-tertiary); margin-bottom: 12px; }

.kb-list { display: grid; grid-template-columns: 1fr; gap: 8px; }
.kb-card {
  background: var(--bg-alt); border: 1px solid var(--border-light);
  border-radius: 10px; padding: 13px 16px;
  cursor: pointer;
  transition: background 0.16s ease, border-color 0.16s ease;
}
.kb-card:hover, .kb-card.is-open {
  background: var(--surface); border-color: var(--kb-bd-soft);
}
.kb-card-row {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: 8px; margin-bottom: 4px;
}
.kb-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 0.12em; text-transform: uppercase;
  font-weight: 700; padding: 2px 6px;
  border-radius: 4px;
  background: var(--tag-bg); color: var(--text-tertiary);
  border: 1px solid var(--border-light);
}
/* legacy numeric */
.kb-tag--lvl1 { color: #98D89E; border-color: rgba(120,200,130,0.28); }
.kb-tag--lvl2 { color: #6CB8E0; border-color: rgba(108,184,224,0.28); }
.kb-tag--lvl3 { color: #A89CE0; border-color: rgba(168,156,224,0.28); }
.kb-tag--lvl4 { color: #F0B060; border-color: rgba(240,176,96,0.28); }
.kb-tag--lvl5 { color: #F09070; border-color: rgba(240,144,112,0.28); }
/* named difficulty (schema v2) */
.kb-tag--lvl-beginner   { color: #98D89E; border-color: rgba(120,200,130,0.28); }
.kb-tag--lvl-builder    { color: #6CB8E0; border-color: rgba(108,184,224,0.28); }
.kb-tag--lvl-technical  { color: #A89CE0; border-color: rgba(168,156,224,0.28); }
.kb-tag--lvl-researcher { color: #F0B060; border-color: rgba(240,176,96,0.28); }
.kb-tag--lvl-frontier   { color: #F09070; border-color: rgba(240,144,112,0.28); }
.kb-tag--type { color: var(--kb-t); border-color: var(--kb-bd-faint); }
.kb-tag--mb { color: #F09070; border-color: rgba(240,144,112,0.34); background: rgba(240,144,112,0.06); }
.kb-tag--quiz { color: #98D89E; border-color: rgba(152,216,158,0.34); background: rgba(152,216,158,0.06); }
.kb-tag--fc { color: #B0A4F0; border-color: rgba(176,164,240,0.34); background: rgba(176,164,240,0.06); }
.kb-tag--phase { color: var(--kb-t); }

.kb-card-q {
  font-size: 14.5px; font-weight: 600; color: var(--text);
  line-height: 1.45; margin: 0; letter-spacing: -0.005em;
}
.kb-card-body {
  margin-top: 12px; padding-top: 12px;
  border-top: 1px solid var(--border-light);
  display: none;
}
.kb-card.is-open .kb-card-body { display: block; }
.kb-card-section { margin-bottom: 10px; }
.kb-card-section:last-child { margin-bottom: 0; }
.kb-card-section-h {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--kb-t); font-weight: 700; margin-bottom: 4px;
}
.kb-card-section-d {
  font-size: 13.5px; line-height: 1.65;
  color: var(--text-secondary); margin: 0;
}
.kb-card-section-d.kb-ans { color: var(--text); }
.kb-card-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 8px; }
.kb-card-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; color: var(--text-tertiary);
  background: var(--bg); border: 1px solid var(--border-light);
  border-radius: 4px; padding: 2px 7px;
}

/* ============================================
   FLASHCARD MODE
   ============================================ */
.kb-fc-wrap { max-width: 720px; margin: 0 auto; }
.kb-fc-stats {
  display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 14px;
  font-family: 'JetBrains Mono', monospace; font-size: 11.5px;
  color: var(--text-tertiary);
}
.kb-fc-stat strong { color: var(--kb-t); font-weight: 700; }
.kb-fc {
  background: var(--bg-alt);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--kb-bd);
  border-radius: 14px;
  padding: 32px 26px; min-height: 260px;
  display: flex; flex-direction: column; gap: 18px;
  cursor: pointer; user-select: none;
  transition: background 0.18s ease, border-color 0.18s ease;
}
.kb-fc:hover { background: var(--surface); }
.kb-fc-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.kb-fc-q {
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700; line-height: 1.3;
  color: var(--text); margin: 0; letter-spacing: -0.01em;
}
.kb-fc-hint {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--text-tertiary);
  margin-top: auto;
}
.kb-fc-a {
  font-size: 15px; line-height: 1.7;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-light);
  padding-top: 14px; margin: 0; display: none;
}
.kb-fc.is-revealed .kb-fc-a { display: block; }
.kb-fc.is-revealed .kb-fc-hint { display: none; }

.kb-fc-actions {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-top: 14px; justify-content: center;
}
.kb-fc-action {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; letter-spacing: 0.04em;
  text-transform: uppercase; font-weight: 600;
  padding: 9px 16px; border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-alt); color: var(--text);
  cursor: pointer;
  transition: background 0.16s ease, border-color 0.16s ease;
}
.kb-fc-action--known { color: #98D89E; border-color: rgba(152,216,158,0.36); }
.kb-fc-action--known:hover { background: rgba(152,216,158,0.08); border-color: #98D89E; }
.kb-fc-action--missed { color: #F09070; border-color: rgba(240,144,112,0.36); }
.kb-fc-action--missed:hover { background: rgba(240,144,112,0.08); border-color: #F09070; }
.kb-fc-action--skip { color: var(--text-tertiary); }
.kb-fc-action--skip:hover { color: var(--text); border-color: var(--kb-bd-soft); }
.kb-fc-action--reset { color: var(--text-tertiary); }
.kb-fc-progress {
  margin-top: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; color: var(--text-tertiary);
  text-align: center;
}

/* ============================================
   QUIZ MODE
   ============================================ */
.kb-quiz-wrap { max-width: 760px; margin: 0 auto; }
.kb-quiz-stats {
  display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 14px;
  font-family: 'JetBrains Mono', monospace; font-size: 11.5px;
  color: var(--text-tertiary);
}
.kb-quiz-stats strong { color: var(--kb-t); }
.kb-quiz {
  background: var(--bg-alt); border: 1px solid var(--border-light);
  border-radius: 14px; padding: 24px 22px;
}
.kb-quiz-q {
  font-size: clamp(17px, 2.4vw, 20px);
  font-weight: 700; line-height: 1.4;
  color: var(--text); margin: 12px 0 18px;
  letter-spacing: -0.005em;
}
.kb-quiz-opts { display: grid; grid-template-columns: 1fr; gap: 8px; }
.kb-quiz-opt {
  text-align: left;
  background: var(--bg); border: 1px solid var(--border-light);
  border-radius: 10px; padding: 12px 14px;
  font-size: 14px; color: var(--text);
  cursor: pointer; font-family: inherit; line-height: 1.55;
  display: grid; grid-template-columns: 24px 1fr; gap: 10px; align-items: start;
  transition: background 0.14s ease, border-color 0.14s ease;
}
.kb-quiz-opt:hover { background: var(--surface); border-color: var(--kb-bd-soft); }
.kb-quiz-opt-letter {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; font-weight: 700;
  color: var(--kb-t);
  background: rgba(194,138,64,0.14);
  border: 1px solid var(--kb-bd-faint);
  border-radius: 5px; width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
}
.kb-quiz-opt.is-correct {
  border-color: rgba(152,216,158,0.5);
  background: rgba(152,216,158,0.06);
}
.kb-quiz-opt.is-correct .kb-quiz-opt-letter {
  color: #98D89E; background: rgba(152,216,158,0.16);
  border-color: rgba(152,216,158,0.36);
}
.kb-quiz-opt.is-wrong {
  border-color: rgba(240,144,112,0.46);
  background: rgba(240,144,112,0.05);
}
.kb-quiz-opt.is-wrong .kb-quiz-opt-letter {
  color: #F09070; background: rgba(240,144,112,0.14);
  border-color: rgba(240,144,112,0.32);
}
.kb-quiz-opt.is-disabled { cursor: default; }
.kb-quiz-exp {
  margin-top: 14px; padding: 12px 14px;
  background: var(--kb-bg-deep);
  border: 1px solid var(--kb-bd-faint);
  border-radius: 10px;
  font-size: 13px; line-height: 1.65;
  color: var(--text-secondary);
}
.kb-quiz-exp strong { color: var(--kb-t); margin-right: 6px; }
.kb-quiz-controls {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-top: 14px; justify-content: space-between;
}

/* ============================================
   INTERVIEW / FOUNDER / RESEARCHER prompt panes
   ============================================ */
.kb-prompts {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 10px;
}
.kb-prompt {
  background: var(--bg-alt); border: 1px solid var(--border-light);
  border-left: 3px solid var(--kb-bd-soft);
  border-radius: 12px; padding: 16px 18px;
  display: flex; flex-direction: column; gap: 8px;
}
.kb-prompt-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.16em;
  color: var(--kb-t); font-weight: 700;
}
.kb-prompt-q {
  font-size: 15px; font-weight: 700; line-height: 1.4;
  color: var(--text); margin: 0; letter-spacing: -0.005em;
}
.kb-prompt-d {
  font-size: 12.5px; line-height: 1.7;
  color: var(--text-secondary); margin: 0;
}

/* ============================================
   SYNTHESIS BLOCK
   ============================================ */
.kb-synthesis {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
  margin-top: 16px;
}
.kb-synth-block {
  background: var(--bg-alt);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--kb-bd-soft);
  border-radius: 12px;
  padding: 14px 16px;
}
.kb-synth-h {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--kb-t);
  font-weight: 700;
  margin-bottom: 6px;
}
.kb-synth-d {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-secondary);
  margin: 0;
}
.kb-synth-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 4px;
}
.kb-synth-list li {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-secondary);
  padding-left: 14px;
  position: relative;
}
.kb-synth-list li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--kb-t);
  font-weight: 700;
}

/* ============================================
   SOURCE METHODOLOGY
   ============================================ */
.kb-source {
  background: var(--bg-alt);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 22px 24px;
}
.kb-source-h {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--kb-t); font-weight: 700; margin-bottom: 10px;
}
.kb-source-d {
  font-size: 14px; line-height: 1.7;
  color: var(--text-secondary);
  max-width: 760px; margin: 0 0 12px;
}
.kb-source-note {
  font-size: 12.5px; line-height: 1.7;
  color: var(--text-tertiary);
  border-top: 1px solid var(--border-light);
  padding-top: 12px; margin: 0;
}

/* ============================================
   POINT OF THE PAGE
   ============================================ */
.kb-point {
  background: linear-gradient(180deg, rgba(194,138,64,0.06), transparent 100%), var(--bg-alt);
  border: 1px solid var(--kb-bd-soft);
  border-radius: 16px;
  padding: 32px 28px; margin-top: 30px;
}
.kb-point-h {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700; line-height: 1.2;
  color: var(--text); margin: 0 0 12px; letter-spacing: -0.015em;
}
.kb-point-d {
  font-size: 15px; line-height: 1.7;
  color: var(--text-secondary);
  max-width: 720px; margin: 0 0 22px;
}
.kb-point-cta { display: flex; flex-wrap: wrap; gap: 10px; }

/* ============================================
   MOBILE
   ============================================ */
@media (max-width: 720px) {
  .kb-hero { padding: 130px 0 50px; }
  .kb-hero-cta { gap: 8px; }
  .kb-hero-stat-num { font-size: 16px; }

  .kb-modes { gap: 4px; padding-bottom: 10px; }
  .kb-mode { font-size: 11px; padding: 7px 10px; }

  .kb-card { padding: 12px 14px; }
  .kb-card-q { font-size: 13.5px; }

  .kb-fc { padding: 24px 18px; }
  .kb-fc-q { font-size: 19px; }

  .kb-quiz { padding: 18px 16px; }

  .kb-phase-head { grid-template-columns: 64px 1fr auto; gap: 10px; }
  .kb-phase-tag { font-size: 11px; padding: 5px 8px; }
  .kb-phase-title { font-size: 15px; }

  .kb-book { padding: 20px 18px; }

  .kb-section { padding: 40px 0; }
}

@media (max-width: 480px) {
  .kb-hero-title { font-size: 32px; }
  .kb-hero-subtitle { font-size: 16px; }
  .kb-hero-body { font-size: 14.5px; }
  .kb-domain { padding: 12px 14px; }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes kb-fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: none; }
}
.kb-fade-in { animation: kb-fade-in 0.32s cubic-bezier(0.16, 1, 0.3, 1) both; }

@media (prefers-reduced-motion: reduce) {
  .kb-fade-in { animation: none; }
  .kb-domain, .kb-book, .kb-card, .kb-phase { transition: none !important; transform: none !important; }
}