.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  z-index: 50;
  background: rgba(10, 10, 10, 0.6);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}

.nav.is-scrolled {
  border-bottom-color: var(--border);
  background: rgba(10, 10, 10, 0.82);
}

.nav-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  color: var(--text);
  height: 38px;
  flex-shrink: 0;
}
.nav-brand .logo-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 38px;
  color: var(--text);
}
.nav-brand .logo-lockup__mark {
  display: block;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}
.nav-brand .logo-lockup__wordmark {
  flex-shrink: 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 3px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  gap: 2px;
}
.lang-switcher a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 26px;
  padding: 0 8px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.lang-switcher a:hover {
  color: var(--text);
}
.lang-switcher a.active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
}

@media (max-width: 720px) {
  .nav-actions .btn-ghost.hide-mobile {
    display: none;
  }
  .lang-switcher a:not(.active) {
    color: var(--text-faint);
  }
}

@media (max-width: 480px) {
  .nav-brand .wordmark { display: none; }
  .lang-switcher a {
    min-width: 28px;
    padding: 0 6px;
  }
}