/* ════════════════════════════════════════════════════
   FAIR CODE — explainer cards + detail page
   matches "The Audit Ledger" design system
   ════════════════════════════════════════════════════ */

/* ── Cards (homepage grid) ─────────────────────────── */
.explainer-section-note {
  max-width: 760px;
  margin: 18px 0 30px;
  color: var(--muted);
  line-height: 1.8;
  font-size: 14px;
}

.explainer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.explainer-card {
  border: 1px solid var(--border);
  background: var(--bg);
  min-height: 100%;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
  content-visibility: auto;
  contain-intrinsic-size: 280px;
}

.explainer-card:hover,
.explainer-card:focus-within {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 16px 36px rgba(20, 16, 8, 0.1);
}

.explainer-card-link {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 26px 26px 22px;
  min-height: 100%;
  color: inherit;
  text-decoration: none;
}

.explainer-card-top {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}

.explainer-num {
  font-family: var(--mono, 'IBM Plex Mono', monospace);
  font-size: 9.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.explainer-card .explainer-title {
  font-family: var(--serif, 'Instrument Serif', Georgia, serif);
  font-weight: 400;
  font-size: clamp(22px, 2vw, 28px);
  line-height: 1.08;
  letter-spacing: -0.005em;
  color: var(--white);
  margin-bottom: 10px;
}

.explainer-card .explainer-tagline {
  font-family: var(--serif, 'Instrument Serif', Georgia, serif);
  font-style: italic;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.55;
  max-width: none;
}

.explainer-arrow {
  color: var(--accent);
  font-size: 18px;
  line-height: 1;
  flex-shrink: 0;
  transition: transform 0.18s ease;
}

.explainer-card:hover .explainer-arrow {
  transform: translate(2px, -2px);
}

.explainer-summary {
  color: var(--text);
  line-height: 1.75;
  font-size: 13.5px;
}

.explainer-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.explainer-pill {
  display: inline-flex;
  align-items: center;
  font-family: var(--mono, 'IBM Plex Mono', monospace);
  border: 1px solid var(--border2);
  border-radius: 999px;
  padding: 5px 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 8.5px;
}

.explainer-link-copy {
  font-family: var(--mono, 'IBM Plex Mono', monospace);
  color: var(--accent);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* ── Detail page ───────────────────────────────────── */
.explainer-page {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

.explainer-page {
  --explainer-code-bg: #191610;
  --explainer-code-text: #d6d0bd;
  --explainer-code-border: var(--border2);
}

html[data-theme="dark"] .explainer-page {
  --explainer-code-bg: #100e09;
  --explainer-code-text: #cfc7b0;
}

.explainer-shell {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 24px 90px;
}

.explainer-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 40px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.explainer-topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.explainer-back,
.explainer-source {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono, 'IBM Plex Mono', monospace);
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 10px;
  transition: color 0.15s;
}

.explainer-back:hover,
.explainer-source:hover {
  color: var(--accent);
}

.explainer-theme-toggle {
  width: 34px;
  height: 34px;
  border: 1px solid var(--border2);
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 14px;
  transition: color 0.15s, border-color 0.15s, transform 0.3s;
}

.explainer-theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: rotate(40deg);
}

.explainer-hero {
  margin-bottom: 36px;
}

.explainer-kicker {
  font-family: var(--mono, 'IBM Plex Mono', monospace);
  font-size: 10px;
  color: var(--accent);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.explainer-kicker::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.explainer-headline {
  font-family: var(--serif, 'Instrument Serif', Georgia, serif);
  font-weight: 400;
  font-size: clamp(40px, 6.5vw, 72px);
  line-height: 0.98;
  letter-spacing: -0.015em;
  color: var(--white);
  margin-bottom: 20px;
}

.explainer-lede {
  max-width: 700px;
  color: var(--muted);
  line-height: 1.85;
  font-size: 15px;
  margin-bottom: 6px;
}

.explainer-lede:first-of-type {
  font-family: var(--serif, 'Instrument Serif', Georgia, serif);
  font-style: italic;
  font-size: 19px;
  color: var(--text);
  line-height: 1.6;
}

.explainer-status {
  font-family: var(--mono, 'IBM Plex Mono', monospace);
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  margin: 16px 0 24px;
}

.explainer-content {
  display: grid;
  gap: 20px;
}

.explainer-content h1,
.explainer-content h2,
.explainer-content h3,
.explainer-content h4,
.explainer-content h5,
.explainer-content h6 {
  font-family: var(--serif, 'Instrument Serif', Georgia, serif);
  font-weight: 400;
  color: var(--white);
  line-height: 1.08;
  letter-spacing: -0.005em;
}

.explainer-content h1 { font-size: clamp(30px, 4vw, 44px); margin-top: 18px; }
.explainer-content h2 {
  font-size: clamp(26px, 3vw, 36px);
  margin-top: 26px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}
.explainer-content h3 { font-size: clamp(20px, 2.2vw, 26px); margin-top: 12px; }

.explainer-content p,
.explainer-content li {
  font-size: 15px;
  line-height: 1.9;
  color: var(--text);
}

.explainer-content p { margin: 0; }

.explainer-content ul {
  padding-left: 22px;
  display: grid;
  gap: 10px;
}

.explainer-content li::marker { color: var(--accent); }

.explainer-content a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }

.explainer-content blockquote {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 22px;
  font-family: var(--serif, 'Instrument Serif', Georgia, serif);
  font-style: italic;
  font-size: 17px;
  color: var(--muted);
}

.explainer-content blockquote p {
  font-size: inherit;
  font-family: inherit;
  color: inherit;
  line-height: 1.7;
}

.explainer-content hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 10px 0;
}

.explainer-content pre {
  overflow: auto;
  background: var(--explainer-code-bg);
  border: 1px solid var(--explainer-code-border);
  padding: 20px 22px;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--explainer-code-text);
}

.explainer-content code {
  font-family: var(--mono, 'IBM Plex Mono', monospace);
  font-size: 0.88em;
  background: var(--bias-track-bg, var(--surface));
  color: var(--accent);
  padding: 1px 6px;
  border-radius: 3px;
}

.explainer-content pre code {
  background: transparent;
  padding: 0;
  border-radius: 0;
  color: var(--explainer-code-text);
  font-size: inherit;
}

.explainer-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border2);
}

.explainer-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
}

.explainer-table th,
.explainer-table td {
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  font-size: 13.5px;
  line-height: 1.7;
}

.explainer-table tr:last-child td { border-bottom: none; }

.explainer-table th {
  font-family: var(--mono, 'IBM Plex Mono', monospace);
  color: var(--accent);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: var(--surface);
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 1100px) {
  .explainer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  .explainer-shell { padding-inline: 18px; }
  .explainer-grid { grid-template-columns: 1fr; }
  .explainer-card-link { padding: 22px 20px 18px; }
}