.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(1.5rem, 5vw, 4rem);
  transition: background var(--t-med), backdrop-filter var(--t-med);
}

/* Scrolled state — subtle frosted background */
.site-header.scrolled {
  background: rgba(244, 243, 239, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

/* On hero (home) — transparent with white text */
.site-header.on-hero {
  color: var(--white);
}
.site-header.on-hero .site-nav a { color: var(--white); }
.site-header.on-hero .logo { color: var(--white); }
.site-header.on-hero .nav-toggle { color: var(--white); }

/* Non-home pages always show bg */
.site-header.always-bg {
  background: rgba(244, 243, 239, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  color: var(--fg);
}
.site-header.always-bg .site-nav a { color: var(--fg); }
.site-header.always-bg .logo { color: var(--fg); }

/* Logo */
.logo {
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: inherit;
  transition: opacity var(--t-fast);
}
.logo:hover { opacity: 0.65; }

/* Nav links */
.site-nav {
  display: flex;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: center;
}
.site-nav a {
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: inherit;
  transition: opacity var(--t-fast);
  position: relative;
}
.site-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -3px;
  width: 0; height: 1px;
  background: currentColor;
  transition: width var(--t-med);
}
.site-nav a:hover::after,
.site-nav a.active::after { width: 100%; }

/* Hamburger (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--t-fast), opacity var(--t-fast);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--bg);
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem clamp(1.5rem, 5vw, 4rem);
    gap: 1.5rem;
    border-bottom: 1px solid var(--border);
    transform: translateY(calc(-100% - var(--nav-h) - 1px));
    transition: transform var(--t-med);
  }
  .site-nav.open { transform: translateY(0); }
  .site-nav a { font-size: 0.85rem; color: var(--fg) !important; }
}