.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-height);
}

/* Amber accent bar at very top */
.header-accent {
  height: 3px;
  background: var(--color-accent);
  width: 100%;
}

/* Main bar — dark on hero, light after scroll */
.header-bar {
  background: var(--color-dark);
  transition: background var(--duration-slow) var(--ease-out),
              backdrop-filter var(--duration-slow);
}
.site-header.nav-light .header-bar {
  background: rgba(250,248,244,0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* Bottom rule */
.header-rule {
  height: 1px;
  background: var(--color-dark-rule);
  transition: background var(--duration-slow);
}
.site-header.nav-light .header-rule { background: var(--color-border); }

/* Inner layout */
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

/* Brand */
.header-brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  flex-shrink: 0;
}

.header-logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  line-height: 1;
}

.nav-logo { display: block; height: 38px; width: auto; }
.nav-logo--light { display: none; }
.site-header.nav-light .nav-logo--dark { display: none; }
.site-header.nav-light .nav-logo--light { display: block; }

.header-tagline {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--color-dark-muted);
  display: none;
  transition: color var(--duration-fast);
}
.site-header.nav-light .header-tagline { color: var(--color-ink-300); }
@media (min-width: 960px) { .header-tagline { display: block; } }

/* Nav links — dot separated */
.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0;
}

.nav-link {
  font-size: 0.8rem;
  font-weight: var(--weight-medium);
  color: var(--color-dark-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  transition: color var(--duration-fast);
}
.nav-link:hover { color: var(--color-cream-50); }
.site-header.nav-light .nav-link { color: var(--color-ink-500); }
.site-header.nav-light .nav-link:hover { color: var(--color-ink-900); }

.nav-dot {
  color: var(--color-dark-rule);
  font-size: var(--text-sm);
  pointer-events: none;
  user-select: none;
  transition: color var(--duration-fast);
}
.site-header.nav-light .nav-dot { color: var(--color-rule); }

/* Arrow CTA — text only, no button box */
.nav-start {
  font-size: 0.8rem;
  font-weight: var(--weight-semibold);
  color: var(--color-accent);
  text-decoration: none;
  white-space: nowrap;
  transition: opacity var(--duration-fast);
  letter-spacing: 0.01em;
}
.nav-start:hover { opacity: 0.75; }

/* Mobile toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  color: var(--color-dark-muted);
  transition: color var(--duration-fast);
}
.site-header.nav-light .nav-toggle { color: var(--color-ink-700); }
.nav-toggle .icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .icon-menu { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: block; }

@media (max-width: 767px) {
  .nav-toggle { display: flex; }
  .header-nav {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--color-dark);
    border-bottom: 1px solid var(--color-dark-border);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) 6%;
    gap: var(--space-1);
  }
  .site-header.nav-light .header-nav { background: var(--color-cream-50); border-bottom-color: var(--color-border); }
  .header-nav.open { display: flex; }
  .nav-links { flex-direction: column; align-items: flex-start; width: 100%; }
  .nav-dot { display: none; }
  .nav-link { font-size: var(--text-base); padding: var(--space-3) 0; color: var(--color-dark-muted); }
  .site-header.nav-light .nav-link { color: var(--color-ink-500); }
  .nav-start { padding: var(--space-4) 0; font-size: var(--text-base); }
}