.nav {
  position: fixed;
  top: var(--space-breath);
  left: 50%;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: var(--space-sigh);
  width: min(calc(100% - 2rem), 58rem);
  min-height: 3rem;
  padding: 0.65rem var(--space-sigh);
  color: var(--color-ink-soft);
  background: rgba(247, 242, 234, 0.68);
  border: var(--border-whisper);
  border-radius: var(--radius-soft);
  backdrop-filter: blur(12px);
  opacity: 1;
  transition:
    opacity var(--duration-slow) var(--ease-out-soft),
    transform var(--duration-slow) var(--ease-out-soft);
  transform: translateX(-50%);
}

.nav[data-state="hidden"] {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -0.5rem);
}

.nav[data-state="visible"] {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%);
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-cn-display);
  font-size: var(--text-caption);
  letter-spacing: var(--tracking-display);
  text-decoration: none;
  color: var(--color-wood);
  white-space: nowrap;
}

.nav-brand__heart {
  display: inline-block;
  width: 15px;
  height: auto;
  object-fit: contain;
  flex: none;
  animation: heart-breathe var(--duration-tide) var(--ease-in-out-tide) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .nav-brand__heart {
    animation: none;
  }
}

.nav nav {
  display: flex;
  align-items: center;
  gap: var(--space-breath);
  margin-left: auto;
}

.nav nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-size: var(--text-caption);
  text-decoration-color: transparent;
}

.nav nav a + a::before {
  content: "·";
  margin-right: var(--space-breath);
  color: var(--color-fog);
}

@media (max-width: 640px) {
  .nav {
    top: 0.75rem;
    width: min(calc(100% - 1rem), 26rem);
    padding: 0.5rem 0.85rem;
  }

  .nav nav a:not(:last-child) {
    display: none;
  }
}