/* ============================================================
   PERSISTENT FIXED HEADER — shared across all sections.
   Load this AFTER the section CSS so it wins over their (now
   unused) header rules. Tokens/reset come from hero.css.
   Top-right slot: MENU on Hero, section label elsewhere
   (toggled by header.js via a scroll-spy IntersectionObserver).
   ============================================================ */
.site-header {
  position: fixed;
  top: var(--edge-top);
  left: 0; right: 0;
  height: 35px;
  z-index: 100;
}

.site-header .brand-logo {
  position: absolute; left: 40px; top: 5px;
  width: 48px; height: 23px; display: block;
}
.site-header .brand-logo svg { width: 100%; height: 100%; display: block; }

.site-header .wordmark {
  position: absolute; left: 98px; top: 0;
  font-family: var(--font-display);
  font-weight: 500; font-size: var(--fs-nav); letter-spacing: var(--tracking);
  line-height: 35px; white-space: nowrap; color: var(--cream);
  -webkit-text-stroke: var(--stroke-w) var(--red); paint-order: stroke fill;
}
.site-header .wordmark .red { color: var(--red); }

.site-header .rule-h {
  position: absolute; top: 16px; height: var(--rule-w); background: var(--cream);
}

/* Top-right slot: MENU (Hero) and section label (elsewhere) share the same
   right anchor. The slot fades out → swaps → fades in on every section change. */
.site-header .header-slot {
  position: absolute; right: var(--edge-x); top: 0;
  transition: opacity .22s ease;
}
.site-header .menu-btn,
.site-header .section-label {
  /* stay inside the slot (override the sections' old position:absolute) */
  position: static; right: auto; top: auto;
  font-family: var(--font-display); font-weight: 500; font-size: var(--fs-nav);
  letter-spacing: var(--tracking); line-height: 35px; color: var(--cream);
  -webkit-text-stroke: var(--stroke-w) var(--red); paint-order: stroke fill;
  white-space: nowrap;
}
.site-header .menu-btn { background: none; border: none; cursor: pointer; padding: 0; }
.site-header .menu-btn[hidden] { display: none; }
.site-header .section-label[aria-hidden="true"] { display: none; }

/* ---------- Menu overlay ---------- */
.site-header .menu-overlay {
  position: fixed; top: 110px; right: calc(var(--edge-x) - 5px);
  z-index: 110; display: flex; flex-direction: column; align-items: flex-end;
  gap: 6px; pointer-events: none;
}
.site-header .menu-overlay a {
  font-family: var(--font-display); font-weight: 500; font-size: var(--fs-nav);
  letter-spacing: var(--tracking); text-transform: uppercase; color: var(--cream);
  text-decoration: none; opacity: 0; transform: translateY(-8px);
  transition: opacity .5s ease, transform .5s ease; pointer-events: none;
}
.site-header .menu-overlay a:hover {
  -webkit-text-stroke: var(--stroke-w) var(--red); paint-order: stroke fill; color: var(--cream);
}
.site-header.menu-open .menu-overlay a { opacity: 1; transform: translateY(0); pointer-events: auto; }
.site-header.menu-open .menu-overlay a:nth-child(1) { transition-delay: .00s; }
.site-header.menu-open .menu-overlay a:nth-child(2) { transition-delay: .06s; }
.site-header.menu-open .menu-overlay a:nth-child(3) { transition-delay: .12s; }
.site-header.menu-open .menu-overlay a:nth-child(4) { transition-delay: .18s; }

/* ---------- Menu navigation cross-fade ---------- */
/* Covers the viewport with the constant page background during a menu jump,
   so sections dissolve into each other instead of scrolling through the
   pinned animations. Driven by header.js. */
.nav-fade {
  position: fixed; inset: 0; z-index: 200;
  background: var(--bg-green);
  opacity: 0; pointer-events: none;
  transition: opacity .28s ease;
}
.nav-fade.is-on { opacity: 1; }

/* ---------- Shared vertical side rule ---------- */
/* Fixed on screen; header.js scales it down (top origin) as the user
   progresses through the whole site: full in Hero → zero at the end. */
.site-rule-v {
  position: fixed;
  right: 30px;
  top: 110px;
  width: var(--rule-w);
  height: calc(100vh - 110px - 87px);
  background: var(--cream);
  transform-origin: top center;
  z-index: 90;
  pointer-events: none;
}

@media (max-width: 768px) {
  .site-header .brand-logo { left: 20px; }
  .site-header .wordmark { left: 74px; }
  .site-header .header-slot { right: 20px; }
  .site-rule-v { right: 20px; }
}