/* ═══ Site navigation ════════════════════════════════════════════════
   The homepage header, shared by every page. Values are copied from the
   NAV / HAMBURGER rules in styles.css so pages that don't load styles.css
   render it identically. Colours are literals (#0a0a0a / #ffffff) because
   not every stylesheet defines the --black / --white tokens. */

.hero-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3.5rem;
  padding: 1.8rem;
  z-index: 200;
  border-bottom: 1px solid transparent;
  transition:
    padding 0.4s ease,
    background 0.4s ease,
    backdrop-filter 0.4s ease,
    border-color 0.4s ease,
    box-shadow 0.4s ease,
    opacity 0.45s ease,
    transform 0.45s ease;
}

.hero-nav a {
  font-family: "Martian Mono", monospace;
  font-weight: 500;
  font-size: 0.7rem;
  text-decoration: none;
  color: #0a0a0a;
  letter-spacing: 0.08em;
  transition: opacity 0.2s, color 0.3s;
}

.hero-nav a:hover { opacity: 0.4; }

/* the page you're on */
.hero-nav a[aria-current="page"] {
  border-bottom: 1px solid #0a0a0a;
  padding-bottom: 2px;
}

/* Partner CTA, pinned to the right edge */
.hero-nav #nav-work-btn {
  position: absolute;
  right: 1.8rem;
  top: 50%;
  transform: translateY(-50%);
  background: #0a0a0a;
  color: #ffffff;
  font-size: 0.65rem;
  padding: 0.75rem 1.5rem;
  border-radius: 100px;
  border-bottom: none;
  transition: opacity 0.2s, right 0.4s ease;
}

.hero-nav.scrolled #nav-work-btn { right: 3rem; }
.hero-nav #nav-work-btn:hover { opacity: 0.75; }

/* Wordmark home link, pinned to the left edge (same type as the footer mark).
   On the homepage it only appears once the hero wordmark has scrolled away. */
.hero-nav .nav-home {
  position: absolute;
  left: 1.8rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: "HelveticaNeue-Bold", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: -0.03em;
  transition: opacity 0.3s, left 0.4s ease;
}

.hero-nav.scrolled .nav-home { left: 3rem; }
.hero-nav.nav-home-hidden:not(.scrolled) .nav-home { opacity: 0; pointer-events: none; }

/* Scrolled state: becomes a header bar */
.hero-nav.scrolled {
  padding: 1rem 3rem;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.07);
  box-shadow: 0 1px 24px rgba(0, 0, 0, 0.04);
  justify-content: center;
}

/* Nav steps aside while a full-screen pinned section owns the view */
.hero-nav.nav-away,
.nav-hamburger.nav-away {
  opacity: 0;
  transform: translateY(-120%);
  pointer-events: none;
}

/* ─── Hamburger ─── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  z-index: 300;
  position: fixed;
  top: 1.2rem;
  right: 1.4rem;
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.nav-hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: #0a0a0a;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ─── Mobile overlay ─── */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 250;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
}

.mobile-nav-overlay.open { display: flex; }

.mobile-nav-overlay a {
  font-family: "Martian Mono", monospace;
  font-size: 1rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: #0a0a0a;
  transition: opacity 0.2s;
}

.mobile-nav-overlay a:hover { opacity: 0.4; }

/* Six links, a wordmark and a button need more room than the old menu:
   tighten first, then switch to the hamburger. */
@media (max-width: 1280px) {
  .hero-nav { gap: 1.8rem; }
  .hero-nav #nav-work-btn { right: 1.2rem; padding: 0.65rem 1.2rem; }
  .hero-nav .nav-home { left: 1.2rem; }
  .hero-nav.scrolled #nav-work-btn { right: 1.6rem; }
  .hero-nav.scrolled .nav-home { left: 1.6rem; }
}

@media (max-width: 1080px) {
  .hero-nav { display: none; }
  .nav-hamburger { display: flex; }
}

@media (max-width: 768px) {
  .mobile-nav-overlay {
    gap: 1.5rem;
    padding: 5rem 1.5rem 3rem;
    justify-content: center;
    overflow-y: auto;
  }
  .mobile-nav-overlay a { font-size: 0.85rem; text-align: center; }
}