:root {
  --copper: #BB6622;
  --copper-light: #C59A8D;
  --black: #0D0D0D;
  --off-black: #111111;
  --surface: #161616;
  --surface-2: #1C1C1C;
  --text-primary: #E8E4DC;
  --text-secondary: #9A9590;
  --text-muted: #5A5652;
  --border: #2A2A2A;
  --border-light: #333333;
  --warn: #C8A040;
  --warn-bg: #1A1508;
  --scope-bg: #0A1018;
  --scope-border: rgba(100,160,200,0.2);
}

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

html, body {
  background: var(--black);
  color: var(--text-primary);
  font-family: 'Alegreya', Georgia, serif;
  font-size: 17px;
  line-height: 1.7;
  min-height: 100vh;
}

/* ─── NAV ─── */
nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--off-black);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 48px; height: 56px;
}
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav-logo img { height: 28px; width: auto; }
.nav-logo-text {
  font-family: 'Francois One', sans-serif;
  font-size: 13px; color: var(--text-primary); letter-spacing: 0.04em;
}
.nav-logo-accent { color: var(--copper); }
.nav-back {
  font-family: 'Noto Sans', sans-serif;
  font-size: 9px; font-weight: 300; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--text-muted); text-decoration: none; transition: color 0.2s;
}
.nav-back:hover { color: var(--copper); }
.nav-lang { display: flex; align-items: center; gap: 4px; }
.lang-btn {
  font-family: 'Noto Sans', sans-serif;
  font-size: 9px; font-weight: 300; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-muted); background: none; border: none; cursor: pointer;
  padding: 3px 6px; transition: color 0.2s;
}
.lang-btn.active { color: var(--copper); }
.lang-sep { font-size: 9px; color: var(--border-light); user-select: none; }

/* ─── ARTICLE LAYOUT ─── */
.g-article { max-width: 780px; margin: 0 auto; padding: 0 48px 80px; }

.g-article-header { padding-top: 72px; padding-bottom: 56px; }
.g-eyebrow {
  font-family: 'Noto Sans', sans-serif;
  font-size: 9px; font-weight: 300; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--copper); margin-bottom: 20px;
}
.g-article-title {
  font-family: 'Francois One', sans-serif;
  font-size: clamp(28px, 4vw, 44px); font-weight: 400;
  line-height: 1.05; letter-spacing: -0.01em;
  color: var(--text-primary); margin-bottom: 24px;
}
.g-rule { width: 48px; height: 1px; background: var(--copper); margin-bottom: 28px; }
.g-article-lead {
  font-family: 'Cormorant Garamond', serif;
  font-size: 19px; font-weight: 300; line-height: 1.62;
  color: var(--text-secondary); max-width: 640px;
}

/* ─── PROSE ─── */
.g-prose { display: flex; flex-direction: column; gap: 0; }
.g-h2 {
  font-family: 'Cormorant Garamond', serif;
  font-size: 13px; font-weight: 600; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--text-muted); margin-top: 52px; margin-bottom: 18px;
}
.g-prose p {
  font-family: 'Alegreya', serif;
  font-size: 16.5px; line-height: 1.78; color: var(--text-secondary);
  margin-bottom: 20px;
}
.g-prose p + p { margin-top: -6px; }
.g-prose code {
  font-family: 'Courier New', monospace;
  font-size: 13px; background: var(--surface-2);
  padding: 2px 6px; border-radius: 2px; color: var(--copper-light);
}
.g-prose strong { color: var(--text-primary); font-weight: 500; }
.g-prose em { font-style: italic; }

/* ─── CALLOUTS ─── */
.g-callout {
  background: var(--surface);
  border-left: 2px solid var(--copper);
  padding: 24px 28px;
  margin: 36px 0;
}
.g-callout-warn {
  background: var(--warn-bg);
  border-left-color: var(--warn);
}
.g-callout-scope {
  background: var(--scope-bg);
  border-left-color: var(--scope-border);
  border: 1px solid var(--scope-border);
  border-left-width: 2px;
}
.callout-label {
  display: block;
  font-family: 'Noto Sans', sans-serif;
  font-size: 8px; font-weight: 300; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--copper); margin-bottom: 10px;
}
.g-callout-warn .callout-label { color: var(--warn); }
.g-callout-scope .callout-label { color: #6699BB; }
.g-callout p {
  font-family: 'Alegreya', serif;
  font-size: 15.5px; line-height: 1.72; color: var(--text-secondary);
}

/* ─── EXAMPLE BOX ─── */
.g-example-box {
  background: var(--surface);
  border: 1px solid var(--border-light);
  margin: 40px 0;
}
.example-header {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 24px; border-bottom: 1px solid var(--border);
  background: var(--off-black);
}
.example-badge {
  font-family: 'Noto Sans', sans-serif;
  font-size: 8px; font-weight: 300; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--copper);
}
.example-gene {
  font-family: 'Courier New', monospace;
  font-size: 11px; color: var(--text-muted);
}
.example-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--border);
}
.example-col { background: var(--surface); padding: 24px 22px; }
.example-col-full { grid-column: 1 / -1; background: var(--off-black); }
.example-label {
  font-family: 'Noto Sans', sans-serif;
  font-size: 8px; font-weight: 300; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 10px;
}
.example-body {
  font-family: 'Alegreya', serif;
  font-size: 14px; line-height: 1.7; color: var(--text-secondary);
}

/* Genotype table */
.genotype-table { display: flex; flex-direction: column; gap: 1px; background: var(--border); }
.gt-row {
  display: grid; grid-template-columns: 60px 1fr 1fr;
  background: var(--surface-2); padding: 8px 10px;
  font-family: 'Noto Sans', sans-serif; font-size: 11px; font-weight: 300;
  color: var(--text-secondary); gap: 8px; align-items: center;
}
.gt-header {
  background: var(--off-black); color: var(--text-muted);
  font-size: 8px; letter-spacing: 0.12em; text-transform: uppercase;
}
.gt-risk { background: rgba(187,102,34,0.1); }
.gt-mono { font-family: 'Courier New', monospace; font-size: 12px; color: var(--text-primary); }

/* File preview */
.file-preview { padding: 24px; }
.fp-header {
  font-family: 'Noto Sans', sans-serif;
  font-size: 8px; font-weight: 300; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 8px; margin-top: 18px;
}
.fp-header:first-child { margin-top: 0; }
.fp-code {
  font-family: 'Courier New', monospace;
  font-size: 11.5px; line-height: 1.7; color: var(--copper-light);
  background: var(--off-black); padding: 14px 16px;
  border: 1px solid var(--border); overflow-x: auto;
  white-space: pre;
}
.fp-note {
  margin-top: 14px;
  font-family: 'Alegreya', serif;
  font-size: 13.5px; line-height: 1.65; color: var(--text-muted);
  font-style: italic;
}
.fp-note code {
  font-family: 'Courier New', monospace;
  font-size: 11px; background: var(--surface-2);
  padding: 1px 5px; color: var(--copper-light);
}

/* ─── DELIVERS GRID ─── */
.delivers-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1px; background: var(--border);
  border: 1px solid var(--border);
  margin: 32px 0 48px;
}
.delivers-card {
  background: var(--off-black); padding: 28px 26px;
  transition: background 0.2s;
}
.delivers-card:hover { background: var(--surface-2); }
.delivers-num {
  font-family: 'Noto Sans', sans-serif;
  font-size: 9px; font-weight: 300; letter-spacing: 0.22em;
  color: var(--text-muted); text-transform: uppercase;
  display: block; margin-bottom: 10px;
}
.delivers-title {
  font-family: 'Cormorant Garamond', serif;
  font-size: 15px; font-weight: 600; line-height: 1.3;
  color: var(--text-primary); margin-bottom: 10px;
}
.delivers-body {
  font-family: 'Alegreya', serif;
  font-size: 13.5px; line-height: 1.72; color: var(--text-secondary);
}

/* ─── CTA BLOCK ─── */
.g-cta-block {
  margin-top: 52px; padding: 40px;
  border: 1px solid var(--border-light);
  background: var(--surface);
  text-align: center;
}
.cta-label {
  font-family: 'Noto Sans', sans-serif;
  font-size: 9px; font-weight: 300; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 18px;
}
.g-cta-btn {
  display: inline-block;
  font-family: 'Noto Sans', sans-serif;
  font-size: 10px; font-weight: 300; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--text-primary);
  border: 1px solid var(--copper);
  padding: 14px 32px; text-decoration: none;
  transition: background 0.2s, color 0.2s;
  margin-bottom: 18px;
}
.g-cta-btn:hover { background: var(--copper); color: var(--black); }
.cta-note {
  font-family: 'Alegreya', serif;
  font-size: 13.5px; line-height: 1.65; color: var(--text-muted);
  max-width: 480px; margin: 0 auto;
}

/* ─── SUB-NAV ─── */
.g-subnav {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 72px; padding-top: 28px; border-top: 1px solid var(--border);
}
.subnav-back, .subnav-next {
  font-family: 'Noto Sans', sans-serif;
  font-size: 9px; font-weight: 300; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--text-muted); text-decoration: none; transition: color 0.2s;
}
.subnav-back:hover, .subnav-next:hover { color: var(--copper); }

/* ─── FOOTER ─── */
footer {
  background: var(--off-black); border-top: 1px solid var(--border);
  padding: 28px 48px;
}
.f-inner { max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: 10px; }
.f-row { display: flex; justify-content: space-between; align-items: center; }
.f-logo-link {
  font-family: 'Francois One', sans-serif;
  font-size: 11px; color: var(--text-muted); text-decoration: none; transition: color 0.2s;
}
.f-logo-link:hover { color: var(--copper); }
.f-links { display: flex; gap: 20px; align-items: center; }
.f-extlink {
  font-family: 'Noto Sans', sans-serif;
  font-size: 9px; font-weight: 300; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-muted); text-decoration: none; transition: color 0.2s;
}
.f-extlink:hover { color: var(--copper); }
.f-sep { font-size: 9px; color: var(--border-light); user-select: none; }
.f-copy {
  font-family: 'Noto Sans', sans-serif;
  font-size: 9px; font-weight: 300; letter-spacing: 0.1em; color: var(--text-muted);
}

/* ─── RESPONSIVE ─── */
@media (max-width: 680px) {
  nav { padding: 0 20px; }
  .g-article { padding: 0 20px 60px; }
  .example-grid { grid-template-columns: 1fr; }
  .delivers-grid { grid-template-columns: 1fr; }
  .g-subnav { flex-direction: column; gap: 16px; align-items: flex-start; }
  footer { padding: 24px 20px; }
}