.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--header-h);
  padding-inline: var(--space-container-inline);
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background-color 0.28s ease, border-color 0.28s ease;
}

.header__tools {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.language-dropdown {
  position: relative;
  flex-shrink: 0;
}

.language-dropdown__trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.28rem;
  min-width: 44px;
  height: 44px;
  padding: 0 0.42rem 0 0.38rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--green-muted);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition),
    color var(--transition), transform var(--transition);
}

.language-dropdown__trigger:hover {
  border-color: var(--green);
  color: var(--green);
  transform: translateY(-1px);
}

.language-dropdown__trigger:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

.language-dropdown__globe {
  display: grid;
  place-items: center;
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  color: inherit;
}

.language-dropdown__globe-svg {
  width: 0.9rem;
  height: 0.9rem;
  display: block;
}

.language-dropdown__code {
  line-height: 1;
}

.language-dropdown__chevron {
  display: grid;
  place-items: center;
  width: 1rem;
  height: 1rem;
  color: var(--text-muted);
  transition: color var(--transition), transform 0.22s ease;
}

.language-dropdown__trigger:hover .language-dropdown__chevron {
  color: var(--green);
}

.language-dropdown__chevron-svg {
  width: 0.72rem;
  height: 0.72rem;
  display: block;
}

.language-dropdown.is-open .language-dropdown__chevron {
  transform: rotate(180deg);
  color: var(--green);
}

.language-dropdown__menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 60;
  min-width: 9.25rem;
  padding: 0.35rem;
  margin: 0;
  list-style: none;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card-lg);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(-6px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease,
    border-color var(--transition), background var(--transition);
}

.language-dropdown.is-open .language-dropdown__menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.language-dropdown__option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
  padding: 0.55rem 0.65rem;
  border: none;
  border-radius: 8px;
  background: transparent;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  text-align: left;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.language-dropdown__option:hover {
  background: color-mix(in srgb, var(--green) 10%, transparent);
  color: var(--text);
}

.language-dropdown__option:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 0;
}

.language-dropdown__option-label {
  flex: 1;
  min-width: 0;
}

.language-dropdown__check {
  display: grid;
  place-items: center;
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  color: var(--green);
  opacity: 0;
  transform: scale(0.85);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.language-dropdown__check svg {
  width: 0.85rem;
  height: 0.85rem;
  display: block;
}

.language-dropdown__option--active {
  color: var(--text);
  font-weight: 600;
  background: color-mix(in srgb, var(--green) 12%, transparent);
}

.language-dropdown__option--active .language-dropdown__check {
  opacity: 1;
  transform: scale(1);
}

@media (prefers-reduced-motion: reduce) {
  .language-dropdown__menu,
  .language-dropdown.is-open .language-dropdown__menu,
  .language-dropdown__chevron,
  .language-dropdown__check {
    transition-duration: 0.01ms;
  }

  .language-dropdown__trigger:hover {
    transform: none;
  }
}

.logo {
  flex-shrink: 1;
  min-width: 0;
  font-weight: 700;
  font-size: clamp(0.82rem, 2.4vw, 1.08rem);
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text);
  transition: color var(--transition);
}

.logo__text {
  display: block;
}

@media (min-width: 520px) {
  .logo__text {
    white-space: nowrap;
  }
}

.logo:hover {
  color: var(--green);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  gap: clamp(1rem, 2.5vw, 1.75rem);
}

.nav a {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition), text-decoration-color var(--transition),
    font-weight var(--transition);
}

.nav a:hover:not(.nav-link--active) {
  color: var(--text);
}

.nav a.nav-link--active:not(.nav-cta),
.nav a.nav-link--active:not(.nav-cta):hover {
  color: var(--green);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, var(--green) 55%, transparent);
  text-underline-offset: 0.38rem;
}

.nav a.nav-link--active.nav-cta,
.nav a.nav-link--active.nav-cta:hover {
  color: var(--green) !important;
  font-weight: 600;
  text-decoration: none !important;
}

.nav-cta {
  padding: 0.45rem 1rem;
  border-radius: 999px;
  background: var(--green-muted);
  border: 1px solid var(--border);
  color: var(--green) !important;
}

.nav-cta.nav-link--active {
  border-color: color-mix(in srgb, var(--green) 55%, transparent);
  background: color-mix(in srgb, var(--green) 18%, transparent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--green) 12%, transparent);
}

.nav-cta:hover:not(.nav-link--active) {
  background: color-mix(in srgb, var(--green) 20%, transparent);
  color: var(--text) !important;
}

[data-theme="light"] .nav a.nav-link--active,
[data-theme="light"] .nav a.nav-link--active:hover {
  text-decoration-color: color-mix(in srgb, var(--green) 50%, transparent);
}

[data-theme="light"] .nav-cta.nav-link--active {
  background: color-mix(in srgb, var(--green) 16%, transparent);
  border-color: color-mix(in srgb, var(--green) 45%, transparent);
}

.theme-toggle {
  position: relative;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--green-muted);
  color: var(--text);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition),
    color var(--transition), transform var(--transition);
}

.theme-toggle:hover {
  border-color: var(--green);
  color: var(--green);
  transform: translateY(-1px);
}

.theme-toggle__icon {
  position: absolute;
  display: grid;
  place-items: center;
  width: 1.2rem;
  height: 1.2rem;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.theme-toggle__svg {
  width: 100%;
  height: 100%;
  display: block;
  flex-shrink: 0;
}

[data-theme="dark"] .theme-toggle__icon[data-theme-show="dark"],
[data-theme="light"] .theme-toggle__icon[data-theme-show="light"] {
  opacity: 0;
  transform: scale(0.85);
  pointer-events: none;
}

[data-theme="dark"] .theme-toggle__icon[data-theme-show="light"],
[data-theme="light"] .theme-toggle__icon[data-theme-show="dark"] {
  opacity: 1;
  transform: scale(1);
}

.nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  border-radius: 12px;
  background: transparent;
  cursor: pointer;
  color: var(--text);
  transition: background var(--transition);
}

.nav-toggle:hover {
  background: var(--green-muted);
}

.nav-toggle__bar {
  position: absolute;
  left: 11px;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-nav), top var(--transition-nav),
    opacity 0.2s ease;
}

.nav-toggle__bar:nth-child(1) {
  top: 16px;
}

.nav-toggle__bar:nth-child(2) {
  top: 21px;
}

.nav-toggle__bar:nth-child(3) {
  top: 26px;
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(1) {
  top: 21px;
  transform: rotate(45deg);
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-toggle.is-open .nav-toggle__bar:nth-child(3) {
  top: 21px;
  transform: rotate(-45deg);
}

.nav-backdrop {
  display: none;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: grid;
    place-items: center;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    inset: var(--header-h) 0 0 0;
    z-index: 45;
    background: var(--nav-backdrop);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-nav), visibility var(--transition-nav);
  }

  .nav-backdrop.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav {
    z-index: 46;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: min(70vh, 420px);
    overflow-y: auto;
    padding: 0.5rem 1.25rem 1.25rem;
    margin: 0;
    background: var(--nav-mobile-bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-card-lg);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--transition-nav), opacity var(--transition-nav),
      visibility var(--transition-nav), box-shadow var(--transition-nav);
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav a {
    padding: 0.9rem 0;
    border-bottom: 1px solid var(--border);
  }

  .nav a:last-child {
    border-bottom: none;
    margin-top: 0.35rem;
    text-align: center;
    padding-top: 1rem;
  }
}