/* ============================================================
   BRAND BOOK — Living Systems design-system reference page
   Layered on tokens.css + components.css. (styles.css/tokens.css already
   provides .runner, .spec, .spec-head, .tile, .eyebrow, .kbd, dividers.)
   ============================================================ */

/* ---- Cover ---- */
.cover { padding: 80px 0 96px; position: relative; overflow: hidden; }
.cover-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: end; }
.cover h1 {
  font-family: var(--font-serif); font-weight: 400;
  font-size: clamp(72px, 11vw, 168px); line-height: 0.88;
  letter-spacing: -0.04em; margin: 0;
}
.cover h1 em {
  font-style: italic; color: var(--carbon); display: block;
  font-size: 0.55em; letter-spacing: -0.02em; margin-top: 12px;
}
.cover .meta-stack {
  display: flex; flex-direction: column; gap: 28px;
  border-left: 1px solid var(--bone-deep); padding-left: 32px;
  align-self: end; padding-bottom: 18px;
}
.cover .meta-row { display: grid; grid-template-columns: 80px 1fr; gap: 16px; align-items: baseline; }
.cover .meta-row .k {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--slate);
}
.cover .meta-row .v { font-family: var(--font-mono); font-size: 13px; color: var(--ink); }
.cover .strap {
  margin-top: 80px; display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px; align-items: start; border-top: 1px solid var(--ink); padding-top: 24px;
}
.cover .strap p { font-size: 13px; line-height: 1.6; color: var(--carbon); margin: 0; }
.cover .strap .k {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--slate); margin-bottom: 12px; display: block;
}
.cover-helix {
  position: absolute; right: -120px; top: -40px;
  width: 580px; height: 580px; opacity: 0.10; pointer-events: none;
}

/* large section numeral */
.spec-head .num strong {
  display: block; font-family: var(--font-serif); font-style: italic; font-weight: 400;
  font-size: 96px; line-height: 1; color: var(--ink); letter-spacing: -0.04em; margin-top: 12px;
}

/* marquee */
.marquee {
  border-top: 1px solid var(--bone-deep); border-bottom: 1px solid var(--bone-deep);
  padding: 14px 0; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--slate); display: flex; gap: 48px;
  overflow: hidden; white-space: nowrap;
}
.marquee-track { display: flex; gap: 48px; animation: brandMarquee 40s linear infinite; will-change: transform; }
.marquee span { display: inline-flex; align-items: center; gap: 12px; }
.marquee span::after {
  content: ""; width: 4px; height: 4px; background: var(--bone-deep);
  border-radius: 50%; margin-left: 48px;
}
@keyframes brandMarquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

@media (max-width: 1000px) {
  .cover-grid { grid-template-columns: 1fr; gap: 32px; }
  .cover .meta-stack { border-left: 0; padding-left: 0; }
  .cover .strap { grid-template-columns: 1fr 1fr; gap: 32px; }
  .spec-head { grid-template-columns: 1fr !important; gap: 16px !important; }
  .runner nav { display: none !important; }
}
@media (max-width: 620px) {
  .cover .strap { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .marquee-track { animation: none; }
}