/* Site-wide chrome: typography, colour palette, header, footer, buttons,
   and page-content wrapper. Loaded by every prerendered page so they
   share the landing's modernist sans-serif aesthetic. */

:root {
  color-scheme: dark;
  --bg: #0a0a0a;
  --bg-2: #111113;
  --panel: rgba(20, 20, 24, 0.78);
  --panel-soft: rgba(255, 255, 255, 0.025);
  --fg: #f5f5f7;
  --fg-2: rgba(245, 245, 247, 0.72);
  --fg-3: rgba(245, 245, 247, 0.48);
  --rule: rgba(255, 255, 255, 0.08);
  --rule-strong: rgba(255, 255, 255, 0.18);
  --link: #ffffff;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  min-height: 100vh;
  color: var(--fg);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'cv11', 'ss01';
}

a { color: inherit; text-decoration: none; }

/* ---- Layout helpers ---- */
.section-inner {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
}

/* ---- Header ---- */
header.site {
  position: relative;
  z-index: 10;
  padding: 1.4rem 0;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  color: var(--fg);
}
header.site nav {
  display: flex;
  gap: 2rem;
  font-size: 0.9rem;
  font-weight: 400;
}
header.site nav a {
  color: var(--fg-2);
  transition: color 0.2s ease;
}
header.site nav a:hover { color: var(--fg); }
@media (max-width: 640px) {
  header.site nav a:not(:last-child) { display: none; }
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.95rem 1.6rem;
  border-radius: 999px;
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  white-space: nowrap;
  border: 0;
  cursor: pointer;
  font-family: var(--sans);
}
.btn.primary { background: var(--fg); color: var(--bg); }
.btn.primary:hover {
  background: rgba(245, 245, 247, 0.92);
  transform: translateY(-1px);
}
.btn.ghost {
  color: var(--fg);
  border: 1px solid var(--rule-strong);
  background: transparent;
}
.btn.ghost:hover {
  border-color: var(--fg);
  transform: translateY(-1px);
}
.btn .arrow {
  font-size: 1.05em;
  line-height: 1;
  transition: transform 0.2s ease;
}
.btn:hover .arrow { transform: translateX(2px); }

/* ---- Page wrap (subpages) ---- */
.page {
  position: relative;
  z-index: 1;
  width: min(940px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 3.5rem 0 6rem;
}
.page-inner {
  background: rgba(8, 8, 10, 0.62);
  border-radius: 24px;
  padding: 3.5rem clamp(1.25rem, 4vw, 3rem);
  border: 1px solid var(--rule);
}

/* ---- Subpage typography ---- */
.crumbs {
  font-size: 0.85rem;
  color: var(--fg-3);
  margin-bottom: 2rem;
  letter-spacing: -0.005em;
}
.crumbs a { color: var(--fg-3); transition: color 0.2s ease; }
.crumbs a:hover { color: var(--fg); }
.eyebrow {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--fg-3);
  margin-bottom: 0.85rem;
  letter-spacing: -0.005em;
}
h1.page-title {
  font-weight: 600;
  font-size: clamp(2.6rem, 5.6vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.038em;
  margin-bottom: 0.85rem;
  color: var(--fg);
}
h2.section-h {
  font-weight: 600;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  line-height: 1.1;
  letter-spacing: -0.028em;
  margin: 3rem 0 1rem;
  color: var(--fg);
}
.lead {
  font-size: 1.15rem;
  line-height: 1.55;
  color: var(--fg);
  max-width: 60ch;
  margin: 0 0 2rem;
  letter-spacing: -0.012em;
}
p {
  font-size: 1.02rem;
  line-height: 1.65;
  color: var(--fg-2);
  max-width: 64ch;
  margin-bottom: 1rem;
  letter-spacing: -0.008em;
}
.muted { color: var(--fg-3); }

/* ---- Stats grid ---- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.5rem;
  margin: 1.75rem 0 2.5rem;
  padding: 1.6rem 1.8rem;
  background: var(--panel);
  border-radius: 18px;
  border: 1px solid var(--rule);
}
.stat-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-3);
  font-weight: 500;
}
.stat-value {
  font-size: 1.05rem;
  color: var(--fg);
  margin-top: 0.3rem;
  font-weight: 500;
  letter-spacing: -0.012em;
}

/* ---- Information-gain callout ---- */
.info-gain {
  padding: 1.4rem 1.6rem;
  border-left: 2px solid var(--fg);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 0 14px 14px 0;
  margin: 1.5rem 0 2.5rem;
}
.info-gain .ig-eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  color: var(--fg);
  margin-bottom: 0.5rem;
}
.info-gain p {
  margin: 0;
  color: var(--fg);
  font-size: 1.02rem;
}

/* ---- Lists ---- */
ul, ol { padding-left: 1.5rem; max-width: 64ch; }
li {
  margin-bottom: 0.6rem;
  font-size: 1.02rem;
  color: var(--fg-2);
  line-height: 1.65;
}
li strong { color: var(--fg); font-weight: 600; }
.muted-list li::marker { color: var(--fg-3); }

/* ---- Inline links inside body text ---- */
.page-inner p a,
.page-inner li a {
  color: var(--fg);
  border-bottom: 1px solid var(--rule-strong);
  transition: border-color 0.2s ease;
}
.page-inner p a:hover,
.page-inner li a:hover { border-color: var(--fg); }

/* ---- Share row ---- */
.share-row { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 1.5rem 0 2.5rem; }
.share-row a {
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--fg);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.share-row a:hover {
  border-color: var(--fg);
  background: rgba(255, 255, 255, 0.04);
}

/* ---- Detail / FAQ ---- */
details {
  padding: 1.2rem 0;
  border-top: 1px solid var(--rule);
}
details:last-of-type { border-bottom: 1px solid var(--rule); }
details summary {
  cursor: pointer;
  list-style: none;
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: -0.018em;
  color: var(--fg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
details summary::-webkit-details-marker { display: none; }
details summary::after {
  content: '+';
  font-size: 1.4rem;
  line-height: 1;
  font-weight: 300;
  color: var(--fg-3);
  transition: transform 0.25s ease, color 0.2s ease;
}
details[open] summary::after { transform: rotate(45deg); color: var(--fg); }
details p {
  margin-top: 0.85rem;
  color: var(--fg-2);
  font-size: 0.98rem;
  line-height: 1.65;
  max-width: 60ch;
}

/* ---- Body / topic pill cards ---- */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
  padding: 0;
  list-style: none;
  margin: 1.25rem 0 0;
  max-width: 100%;
}
.related-grid li { margin: 0; }
.related-pill {
  display: block;
  padding: 0.95rem 1.1rem;
  border-radius: 16px;
  border: 1px solid var(--rule);
  background: rgba(255, 255, 255, 0.025);
  color: var(--fg);
  text-decoration: none;
  font-size: 0.95rem;
  letter-spacing: -0.008em;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}
.related-pill:hover {
  border-color: var(--rule-strong);
  background: rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
}
.related-pill strong { display: block; font-weight: 600; }
.related-pill span { display: block; color: var(--fg-3); font-size: 0.78rem; margin-top: 2px; }

/* ---- Footer ---- */
footer.site {
  position: relative;
  z-index: 1;
  padding: 2.5rem 0;
  background: rgba(0, 0, 0, 0.6);
  border-top: 1px solid var(--rule);
  font-size: 0.85rem;
  color: var(--fg-3);
  letter-spacing: -0.008em;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}
footer.site a { color: var(--fg-3); transition: color 0.2s ease; }
footer.site a:hover { color: var(--fg); }
footer.site nav { display: flex; gap: 1.5rem; flex-wrap: wrap; }