#nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px var(--gutter);
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}

#nav.scrolled {
  background: rgba(6, 9, 13, 0.95);
  border-bottom: 0.5px solid var(--color-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.nav-logo {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.logo-main {
  font-family: var(--font-sans);
  font-weight: 200;
  font-size: 11px;
  letter-spacing: 6px;
  color: #a0b4c8;
  text-transform: uppercase;
}

.logo-sub {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: 9px;
  letter-spacing: 8px;
  color: var(--color-ocean-mid);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-links a {
  color: #4a7a9a;
  font-size: 9px;
  letter-spacing: 3px;
  text-transform: uppercase;
  transition: color var(--duration) var(--ease);
}

.nav-links a:hover { color: var(--color-ocean-mid); }

/* Hamburger — mobile */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--color-ocean-mid);
  transition: transform var(--duration) var(--ease),
              opacity var(--duration) var(--ease);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}