/* ═══════════════════════════════════════════════════════
   Vietnamese-friendly font overrides · v1 · 2026-05-08
   Reason: JetBrains Mono loaded latin-only → VN diacritics
   fall back to system font → looks broken. Switch affected
   labels to Inter (VN subset loaded site-wide).
   ═══════════════════════════════════════════════════════ */
/* ALL labels currently using JetBrains Mono — switch to Inter for VN diacritics */
.nav-menu-btn,
.nav-dropdown a,
.nav-links,
.lang-switch,
.hero-meta,
.section-label,
.thesis-author,
.fw-tag,
.compare-label,
.rule-num,
.chapter-num,
.chapter-tab-btn,
.flashcard-num,
.flashcard-tag,
.flashcard-hint,
.flashcard-controls,
.fcq-btn,
.journal-prompt-num,
.form-hint,
.form-submit,
.comment-time,
.comment-reply-btn,
.reply-indicator,
.footer-bottom,
.snst-search-bar-text,
.snst-input,
.snst-shortcut,
.action-num,
.action-tab-btn,
.quiz-num,
.quiz-tab-btn,
.related-tag,
.snst-related-num,
/* Vietnam Lens section */
.vn-lens .section-label,
.vn-lens-num,
.vn-lens-badge,
.vn-lens-matrix th,
.vn-lens-matrix td,
.vn-lens-matrix-label,
.vn-lens-toolkit-label,
.vn-lens-toolkit-sub,
.vn-lens-phrase-tag,
.vn-lens-fix strong,
.vn-lens-hero-col-title,
.vn-lens-hero-divider {
  font-family: 'Inter', system-ui, -apple-system, sans-serif !important;
}

/* ═══════════════════════════════════════════════════════
   Nav consolidation: Menu dropdown · v1 · 2026-05-08
   POC on deep-work, scale to 19 books after validation
   ═══════════════════════════════════════════════════════ */

/* 3-zone nav layout: Logo (left) | Search (center) | Actions (right)
   Covers both .nav-bar (books) and .nav (pages/index) */
.nav-bar,
.nav {
  display: grid !important;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
}
.nav-bar > .nav-logo,
.nav > .nav-brand { justify-self: start; grid-column: 1; grid-row: 1; }
.nav-bar > .snst-search-bar,
.nav > .snst-search-bar { justify-self: center; grid-column: 2; grid-row: 1; }
.nav-bar > .nav-actions,
.nav > .nav-actions { justify-self: end; grid-column: 3; grid-row: 1; }

/* Search bar styling — applied site-wide so library.v4.js auto-inject looks consistent */
.snst-search-bar {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(26, 20, 16, 0.06);
  border: 1px solid rgba(26, 20, 16, 0.2);
  padding: 7px 12px; cursor: pointer;
  font-family: 'Inter', sans-serif; color: inherit;
  transition: all 0.2s; min-width: 200px;
  border-radius: 0;
}
.snst-search-bar:hover { background: rgba(26, 20, 16, 0.1); border-color: rgba(26, 20, 16, 0.4); }
.snst-search-bar svg { width: 14px; height: 14px; flex-shrink: 0; opacity: 0.6; }
.snst-search-bar-text { flex: 1; text-align: left; font-size: 13px; opacity: 0.6; font-family: 'Inter', sans-serif; }
.snst-search-bar kbd {
  font-family: 'Inter', sans-serif; font-size: 10px;
  padding: 2px 6px; background: rgba(26, 20, 16, 0.08);
  border: 1px solid rgba(26, 20, 16, 0.2); border-radius: 0;
  color: inherit; opacity: 0.7;
}

[data-theme="dark"] .snst-search-bar {
  background: rgba(245, 241, 235, 0.08);
  border-color: rgba(245, 241, 235, 0.2);
  color: #f5f1eb;
}
[data-theme="dark"] .snst-search-bar:hover {
  background: rgba(245, 241, 235, 0.14);
  border-color: rgba(245, 241, 235, 0.4);
}
[data-theme="dark"] .snst-search-bar kbd {
  background: rgba(245, 241, 235, 0.08);
  border-color: rgba(245, 241, 235, 0.2);
  color: #f5f1eb;
}

@media (max-width: 768px) {
  .nav-bar {
    grid-template-columns: auto 1fr auto;
  }
  .nav-bar > .snst-search-bar {
    justify-self: stretch;
    min-width: 0;
  }
}

@media (max-width: 520px) {
  .nav-bar {
    grid-template-columns: auto auto;
    gap: 8px;
  }
  .nav-bar > .snst-search-bar { display: none; }
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: 'JetBrains Mono', monospace;
}

.nav-menu-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid rgba(26, 20, 16, 0.15);
  border-radius: 4px;
  padding: 8px 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.15s ease;
  font-weight: 600;
}

.nav-menu-btn:hover,
.nav-menu-btn[aria-expanded="true"] {
  background: var(--ink, #1a1410);
  color: var(--paper, var(--cream, #ffffff));
  border-color: var(--ink, #1a1410);
}

.nav-menu-btn svg {
  flex-shrink: 0;
}

/* Dropdown anchored to bottom-right of nav-bar.
   Nav-bar inline CSS uses position: fixed, which acts as positioning context
   for absolute descendants → dropdown positions relative to nav-bar. */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 16px;
  min-width: 220px;
  background: var(--paper, var(--cream, #ffffff));
  border: 1px solid rgba(26, 20, 16, 0.12);
  border-radius: 6px;
  padding: 10px 0;
  box-shadow: 0 12px 32px rgba(26, 20, 16, 0.15);
  z-index: 200;
  display: none;
  flex-direction: column;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  animation: navDropdownFadeIn 0.15s ease;
}

.nav-dropdown.open {
  display: flex;
}

.nav-dropdown a {
  padding: 12px 22px;
  text-decoration: none;
  color: var(--ink, #1a1410);
  cursor: pointer;
  transition: all 0.12s ease;
  font-weight: 600;
  border-left: 3px solid transparent;
}

.nav-dropdown a:hover {
  background: var(--paper-dark, var(--cream-soft, #f7f7f7));
  color: var(--accent-2, var(--rust, #8b3a2b));
  border-left-color: var(--accent-2, var(--rust, #8b3a2b));
}

@keyframes navDropdownFadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Theme toggle button — auto-injected by theme.v5.js, style harmonize */
.nav-actions .theme-toggle {
  background: transparent;
  border: 1px solid rgba(26, 20, 16, 0.15);
  border-radius: 4px;
  padding: 6px 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink);
  transition: all 0.15s ease;
  margin: 0;
  position: static;
}

.nav-actions .theme-toggle:hover {
  background: var(--ink, #1a1410);
  color: var(--paper, var(--cream, #ffffff));
  border-color: var(--ink, #1a1410);
}

/* Mobile responsive nav */
@media (max-width: 640px) {
  .nav-actions { gap: 10px; }
  .nav-menu-btn span { display: none; }
  .nav-menu-btn { padding: 8px 10px; }
  .nav-dropdown { right: 12px; left: 12px; min-width: 0; }
}

[data-theme="dark"] .nav-menu-btn {
  border-color: rgba(245, 241, 235, 0.2);
  color: #f5f1eb;
}
[data-theme="dark"] .nav-menu-btn:hover,
[data-theme="dark"] .nav-menu-btn[aria-expanded="true"] {
  background: #f5f1eb;
  color: #1a1410;
  border-color: #f5f1eb;
}
[data-theme="dark"] .nav-dropdown {
  background: #1c1815;
  border-color: rgba(245, 241, 235, 0.12);
}
[data-theme="dark"] .nav-dropdown a { color: #f5f1eb; }
[data-theme="dark"] .nav-dropdown a:hover { background: #0f0d0b; }
[data-theme="dark"] .nav-actions .theme-toggle {
  border-color: rgba(245, 241, 235, 0.2);
  color: #f5f1eb;
}

/* ═══════════════════════════════════════════════════════
   Vietnam Lens — section style
   v1 · 2026-05-08
   ═══════════════════════════════════════════════════════ */

.vn-lens {
  background: var(--paper-dark);
  padding: 100px 8% 120px;
  border-top: 2px solid var(--ink);
  position: relative;
}

.vn-lens .section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-2);
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.vn-lens .section-label::before {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--accent-2);
}

.vn-lens .section-title {
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.15;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
  max-width: 900px;
}

.vn-lens .section-intro {
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink);
  opacity: 0.85;
  max-width: 760px;
  margin-bottom: 64px;
}

/* ──────────────────────────────────────────────
   TIER 1 — Hero contrast block (USA vs VN)
   ────────────────────────────────────────────── */
.vn-lens-hero {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 32px;
  align-items: stretch;
  margin-bottom: 80px;
  max-width: 980px;
}

.vn-lens-hero-col {
  background: var(--paper);
  padding: 32px 28px;
  border-radius: 4px;
  border: 1px solid rgba(26, 20, 16, 0.08);
}

.vn-lens-hero-col-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: 0.5;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.vn-lens-hero-col-title .flag {
  font-size: 22px;
}

.vn-lens-hero-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.vn-lens-hero-col li {
  font-size: 16px;
  line-height: 1.5;
  padding: 10px 0;
  border-bottom: 1px solid rgba(26, 20, 16, 0.06);
  color: var(--ink);
}

.vn-lens-hero-col li:last-child { border-bottom: none; }

.vn-lens-hero-col.vn li {
  font-weight: 500;
}

.vn-lens-hero-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-2);
  letter-spacing: 0.1em;
}

/* ──────────────────────────────────────────────
   TIER 2 — Conflict Matrix preview table
   ────────────────────────────────────────────── */
.vn-lens-matrix {
  margin-bottom: 80px;
  max-width: 1080px;
}

.vn-lens-matrix-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
  opacity: 0.5;
  margin-bottom: 16px;
}

.vn-lens-matrix table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  border: 1px solid rgba(26, 20, 16, 0.1);
}

.vn-lens-matrix th {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 700;
  text-align: left;
  padding: 18px 20px;
  border-bottom: 2px solid var(--ink);
  color: var(--ink);
}

.vn-lens-matrix th:nth-child(1) { color: var(--accent); }
.vn-lens-matrix th:nth-child(2) { color: var(--accent-2); }
.vn-lens-matrix th:nth-child(3) { color: var(--gold); }

.vn-lens-matrix td {
  padding: 18px 20px;
  font-size: 15.5px;
  line-height: 1.5;
  border-bottom: 1px solid rgba(26, 20, 16, 0.06);
  vertical-align: top;
  color: var(--ink);
}

.vn-lens-matrix tr:last-child td { border-bottom: none; }

.vn-lens-matrix td:nth-child(3) {
  font-weight: 600;
  background: rgba(196, 146, 60, 0.06);
}

/* ──────────────────────────────────────────────
   TIER 3 — Action Cards (deep dive)
   ────────────────────────────────────────────── */
.vn-lens-problems {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 80px;
  max-width: 1080px;
}

.vn-lens-problem {
  background: var(--paper);
  padding: 36px 32px;
  border-left: 4px solid var(--accent-2);
  position: relative;
}

.vn-lens-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink);
  opacity: 0.4;
  margin-bottom: 8px;
}

.vn-lens-badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  padding: 5px 10px;
  border-radius: 2px;
  margin-bottom: 18px;
  font-weight: 600;
}

.vn-lens-title {
  font-family: 'Fraunces', Georgia, serif;
  font-size: 24px;
  line-height: 1.25;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.vn-lens-desc {
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  margin-bottom: 22px;
}

.vn-lens-fix {
  background: rgba(196, 146, 60, 0.1);
  border-left: 3px solid var(--gold);
  padding: 18px 20px;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--ink);
}

.vn-lens-fix strong {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 8px;
  font-weight: 700;
}

.vn-lens-fix em {
  font-style: italic;
  color: var(--accent);
  font-weight: 500;
}

/* ──────────────────────────────────────────────
   TIER 4 — Toolkit (4 phrases copy-paste)
   ────────────────────────────────────────────── */
.vn-lens-toolkit {
  background: var(--ink);
  color: var(--paper);
  padding: 56px 48px;
  margin-bottom: 80px;
  max-width: 1080px;
  border-radius: 4px;
}

.vn-lens-toolkit-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.vn-lens-toolkit-label::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--gold);
}

.vn-lens-toolkit-title {
  font-family: 'Fraunces', Georgia, serif;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--paper);
}

.vn-lens-toolkit-sub {
  font-size: 15px;
  opacity: 0.7;
  margin-bottom: 36px;
  color: var(--paper);
}

.vn-lens-phrases {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.vn-lens-phrase {
  background: rgba(255, 255, 255, 0.05);
  padding: 22px 24px;
  border-left: 2px solid var(--gold);
}

.vn-lens-phrase-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 10px;
  font-weight: 700;
}

.vn-lens-phrase-text {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--paper);
  font-style: italic;
  opacity: 0.95;
}

/* ──────────────────────────────────────────────
   TIER 5 — Conclusion pull quote
   ────────────────────────────────────────────── */
.vn-lens-conclusion {
  max-width: 880px;
  padding: 48px 56px;
  border-left: 4px solid var(--gold);
  background: var(--paper);
  margin-bottom: 0;
}

.vn-lens-conclusion-mark {
  font-family: 'Fraunces', Georgia, serif;
  font-size: 80px;
  line-height: 0.5;
  color: var(--gold);
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

.vn-lens-conclusion p {
  font-family: 'Fraunces', Georgia, serif;
  font-size: 22px;
  line-height: 1.5;
  color: var(--ink);
  font-style: italic;
  margin: 0;
  font-weight: 500;
}

/* ──────────────────────────────────────────────
   EN placeholder
   ────────────────────────────────────────────── */
.vn-lens-placeholder {
  max-width: 720px;
  padding: 48px 56px;
  background: var(--paper);
  border: 1px dashed rgba(26, 20, 16, 0.2);
  text-align: center;
}

.vn-lens-placeholder-flag {
  font-size: 36px;
  margin-bottom: 16px;
}

.vn-lens-placeholder p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  opacity: 0.75;
  margin: 0 0 20px;
}

.vn-lens-placeholder a {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--paper);
  background: var(--ink);
  padding: 12px 22px;
  border-radius: 2px;
  font-weight: 600;
  transition: opacity 0.2s;
}

.vn-lens-placeholder a:hover {
  opacity: 0.85;
}

/* ──────────────────────────────────────────────
   Mobile responsive
   ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .vn-lens { padding: 64px 6% 80px; }
  .vn-lens .section-title { font-size: clamp(26px, 6vw, 36px); }
  .vn-lens-hero { grid-template-columns: 1fr; gap: 16px; }
  .vn-lens-hero-divider { padding: 4px 0; }
  .vn-lens-problems { grid-template-columns: 1fr; gap: 20px; }
  .vn-lens-problem { padding: 28px 24px; }
  .vn-lens-title { font-size: 20px; }
  .vn-lens-toolkit { padding: 40px 28px; }
  .vn-lens-phrases { grid-template-columns: 1fr; gap: 16px; }
  .vn-lens-conclusion { padding: 32px 28px; }
  .vn-lens-conclusion p { font-size: 18px; }
  .vn-lens-matrix { overflow-x: auto; }
  .vn-lens-matrix table { min-width: 640px; }
  .vn-lens-placeholder { padding: 32px 24px; }
}

@media (max-width: 640px) {
  .vn-lens-matrix th,
  .vn-lens-matrix td {
    padding: 14px 12px;
    font-size: 13px;
  }
}

/* ──────────────────────────────────────────────
   Dark mode
   ────────────────────────────────────────────── */
[data-theme="dark"] .vn-lens {
  background: #0f0d0b;
  border-top-color: var(--paper);
}

[data-theme="dark"] .vn-lens .section-title,
[data-theme="dark"] .vn-lens .section-intro,
[data-theme="dark"] .vn-lens-title,
[data-theme="dark"] .vn-lens-desc,
[data-theme="dark"] .vn-lens-fix,
[data-theme="dark"] .vn-lens-conclusion p,
[data-theme="dark"] .vn-lens-placeholder p {
  color: #f5f1eb;
}

[data-theme="dark"] .vn-lens-hero-col,
[data-theme="dark"] .vn-lens-problem,
[data-theme="dark"] .vn-lens-conclusion,
[data-theme="dark"] .vn-lens-placeholder,
[data-theme="dark"] .vn-lens-matrix table {
  background: #1c1815;
  border-color: rgba(245, 241, 235, 0.1);
}

[data-theme="dark"] .vn-lens-hero-col li {
  color: #f5f1eb;
  border-bottom-color: rgba(245, 241, 235, 0.08);
}

[data-theme="dark"] .vn-lens-matrix td {
  color: #f5f1eb;
  border-bottom-color: rgba(245, 241, 235, 0.08);
}

[data-theme="dark"] .vn-lens-matrix th {
  border-bottom-color: var(--paper);
}

[data-theme="dark"] .vn-lens-toolkit {
  background: #050403;
  border: 1px solid rgba(196, 146, 60, 0.3);
}