/* ============================================================
   QI System — shared design tokens, base layout, and
   "Lab Ledger" component library for all kept QI pages.
   ============================================================ */

:root {
  --ink: #0e0e0e;
  --paper: #f5f2eb;
  --paper2: #ede9df;
  --paper3: #e4dfd3;
  --rule: #ccc6b8;
  --muted: #7a7468;
  --accent: #c84b2f;
  --accent2: #1a4a6b;
  --gold: #b8932a;
  --serif: 'DM Serif Display', Georgia, serif;
  --sans: 'Instrument Sans', system-ui, sans-serif;
  --mono: 'DM Mono', 'Cascadia Code', monospace;
  --max: 1080px;
}

/* ---- Base ---- */
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
}

/* ---- Nav (shared, unprefixed — matches existing index.html/about_BTisler.html markup) ---- */
nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
}
.nav-brand em {
  font-style: italic;
  color: var(--accent);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); border-bottom: 2px solid var(--accent); padding-bottom: 2px; }

/* ---- Status tags ("Lab Ledger") ---- */
.qi-tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 9px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.qi-tag .qi-tag-dot { width: 6px; height: 6px; border-radius: 50%; display: inline-block; }
.qi-tag-confirmed { color: var(--accent2); border-color: rgba(26,74,107,0.4); }
.qi-tag-confirmed .qi-tag-dot { background: var(--accent2); }
.qi-tag-null { color: var(--muted); border-color: var(--rule); }
.qi-tag-null .qi-tag-dot { background: var(--muted); }
.qi-tag-prereg { color: var(--gold); border-color: rgba(184,147,42,0.4); }
.qi-tag-prereg .qi-tag-dot { background: var(--gold); }
.qi-tag-exploratory { color: var(--accent); border-color: rgba(200,75,47,0.4); }
.qi-tag-exploratory .qi-tag-dot { background: var(--accent); }

/* ---- Accordion data cards (light, paper-toned) ---- */
.qi-card {
  background: var(--paper2);
  border: 1px solid var(--rule);
  padding: 18px 20px;
  cursor: pointer;
}
.qi-card .qi-card-num {
  font-family: var(--mono);
  font-size: 2rem;
  color: var(--accent);
  line-height: 1;
}
.qi-card .qi-card-label {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 6px;
}
.qi-card .qi-card-trigger {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent2);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
  margin-top: 10px;
  display: inline-block;
}
.qi-card-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}
.qi-card-panel.open {
  max-height: 320px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
}
.qi-card-panel .qi-card-term {
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gold);
  margin-bottom: 6px;
}
.qi-card-panel p {
  font-size: 0.82rem;
  color: #2a2520;
  line-height: 1.6;
  margin: 0 0 8px;
}
.qi-card-panel .qi-card-note {
  color: var(--muted);
  font-style: italic;
}

/* ---- Accordion data cards (dark variant, for index.html's findings-bar) ---- */
.qi-card-dark {
  background: var(--ink);
  border: 1px solid #2a2a2a;
  padding: 18px 20px;
  cursor: pointer;
  color: var(--paper);
}
.qi-card-dark .qi-card-num {
  font-family: var(--mono);
  font-size: 2rem;
  color: var(--accent);
  line-height: 1;
}
.qi-card-dark .qi-card-label {
  font-size: 0.82rem;
  color: rgba(245,242,235,0.65);
  margin-top: 6px;
}
.qi-card-dark .qi-card-trigger {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: #6fa8d8;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
  margin-top: 10px;
  display: inline-block;
}
.qi-card-dark .qi-card-panel.open {
  border-top: 1px solid #2a2a2a;
}
.qi-card-dark .qi-card-panel .qi-card-term {
  color: var(--gold);
}
.qi-card-dark .qi-card-panel p {
  color: rgba(245,242,235,0.85);
}
.qi-card-dark .qi-card-panel .qi-card-note {
  color: rgba(245,242,235,0.6);
}

/* ---- Protocol blocks ---- */
.qi-protocol {
  border-left: 2px solid var(--ink);
  padding-left: 16px;
}
.qi-step {
  display: flex;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--paper3);
  font-size: 0.85rem;
}
.qi-step .qi-step-n {
  font-family: var(--mono);
  color: var(--muted);
}