:root {
  --ink: #0d1117;
  --ink-muted: #3d4451;
  --ink-faint: #8a909e;
  --paper: #f5f2eb;
  --paper-warm: #ede9df;
  --gold: #b8960c;
  --gold-pale: #f7f0d4;
  --red: #c0392b;
  --rule: rgba(13,17,23,0.12);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 96px; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: "Instrument Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
  opacity: 0.35;
  z-index: 0;
}

a { color: inherit; }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 64px;
  padding: 0 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(245,242,235,0.94);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 6px;
}

.brand-text {
  font-family: "DM Serif Display", Georgia, serif;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.brand-text span { color: var(--gold); }

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-links a {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  text-decoration: none;
}

.nav-links a:hover { color: var(--ink); }

.nav-cta {
  background: var(--ink);
  color: var(--paper) !important;
  padding: 9px 16px;
  border-radius: 3px;
}

.guide-lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 4px;
  padding-left: 18px;
  border-left: 1px solid var(--rule);
}

.guide-lang-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--ink-faint);
  font-family: "DM Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 5px 7px;
  border-radius: 3px;
  cursor: pointer;
}

.guide-lang-btn:hover {
  color: var(--ink);
  border-color: var(--rule);
}

.guide-lang-btn.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.guide-hero {
  position: relative;
  z-index: 1;
  padding: 96px 48px 64px;
}

.guide-hero-inner {
  max-width: 980px;
  margin: 0 auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: "DM Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 24px;
}

.eyebrow::before {
  content: "";
  display: block;
  width: 32px;
  height: 1px;
  background: var(--gold);
}

h1, h2, h3 {
  font-family: "DM Serif Display", Georgia, serif;
  letter-spacing: -0.025em;
  line-height: 1.12;
}

h1 {
  max-width: 820px;
  font-size: clamp(48px, 7vw, 86px);
  margin-bottom: 24px;
}

h1 em, h2 em { color: var(--gold); font-style: italic; }

.hero-copy {
  max-width: 720px;
  font-size: 19px;
  color: var(--ink-muted);
}

.hero-meta {
  margin-top: 24px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-family: "DM Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.guide-shell {
  position: relative;
  z-index: 1;
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 48px 96px;
}

.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 56px;
  align-items: start;
}

.guide-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
}

.guide-card {
  min-height: 220px;
  background: rgba(245,242,235,0.96);
  padding: 32px;
  text-decoration: none;
  transition: background 0.18s ease, transform 0.18s ease;
}

.guide-card:hover {
  background: var(--gold-pale);
}

.guide-card-wide {
  grid-column: 1 / -1;
  min-height: 160px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.guide-card-label {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}

.guide-card h2 {
  font-size: 28px;
  margin-bottom: 12px;
}

.guide-card p {
  color: var(--ink-muted);
  font-size: 15px;
}

.glossary-intro {
  max-width: 760px;
  color: var(--ink-muted);
  font-size: 18px;
  margin-bottom: 34px;
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
}

.glossary-term {
  background: rgba(245,242,235,0.96);
  padding: 26px 28px;
}

.glossary-term h2 {
  font-size: 27px;
  margin: 0 0 10px;
}

.glossary-term p {
  color: var(--ink-muted);
  font-size: 15px;
  line-height: 1.65;
}

.article {
  background: rgba(245,242,235,0.82);
}

.article h2 {
  font-size: 34px;
  margin: 48px 0 16px;
}

.article h3 {
  font-size: 24px;
  margin: 32px 0 12px;
}

.article p {
  margin: 0 0 18px;
  color: var(--ink-muted);
}

.article ul, .article ol {
  margin: 0 0 24px 22px;
  color: var(--ink-muted);
}

.article li { margin-bottom: 10px; }

.toc {
  position: sticky;
  top: 92px;
  padding: 22px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 4px;
}

.toc-title {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}

.toc a {
  display: block;
  color: rgba(245,242,235,0.72);
  text-decoration: none;
  font-size: 14px;
  margin-bottom: 12px;
}

.toc a:hover { color: var(--paper); }

.callout {
  margin: 30px 0;
  padding: 22px 24px;
  background: var(--gold-pale);
  border-left: 3px solid var(--gold);
  color: var(--ink-muted);
}

.warning {
  margin: 30px 0;
  padding: 22px 24px;
  background: rgba(192,57,43,0.08);
  border-left: 3px solid var(--red);
  color: var(--ink-muted);
}

.sources {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}

.sources h2 { font-size: 26px; margin-top: 0; }

.sources a {
  color: var(--ink);
  text-decoration-color: var(--gold);
  text-underline-offset: 3px;
}

.cta-panel {
  margin-top: 56px;
  padding: 32px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 5px;
}

.cta-panel h2 {
  font-size: 30px;
  margin: 0 0 12px;
}

.cta-panel p {
  color: rgba(245,242,235,0.68);
  margin-bottom: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gold);
  color: var(--ink);
  border-radius: 3px;
  padding: 12px 20px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
}

.guide-footer {
  position: relative;
  z-index: 1;
  padding: 32px 48px;
  border-top: 1px solid var(--rule);
  color: var(--ink-faint);
  font-size: 13px;
}

.guide-footer-inner {
  max-width: 1060px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

@media (max-width: 860px) {
  .site-nav { padding: 0 20px; }
  .nav-links { gap: 10px; }
  .nav-links a:not(.nav-cta) { display: none; }
  .guide-lang-switcher {
    padding-left: 8px;
    border-left: 0;
  }
  .guide-lang-btn {
    padding: 4px 5px;
    font-size: 9px;
  }
  .guide-hero { padding: 72px 24px 44px; }
  .guide-shell { padding: 0 24px 72px; }
  .guide-layout { grid-template-columns: 1fr; gap: 32px; }
  .guide-card-grid { grid-template-columns: 1fr; }
  .guide-card-wide { grid-column: auto; }
  .glossary-grid { grid-template-columns: 1fr; }
  .toc { position: static; }
  h1 { font-size: 48px; }
}