.site-header {
  position: sticky;
  z-index: 1000;
  top: 0;
  border-bottom: 1px solid var(--color-border-subtle);
  background: var(--color-surface-glass);
  box-shadow: 0 0.625rem 1.875rem var(--color-shadow-faint);
}

.site-header__inner {
  display: flex;
  min-height: 4.25rem;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.site-logo {
  position: relative;
  z-index: 1003;
  display: block;
  flex: 0 0 auto;
  width: min(9.75rem, calc(100vw - 5.25rem));
}

.site-logo img {
  width: 100%;
  height: 3.25rem;
  object-fit: contain;
  object-position: left center;
}

.menu-toggle {
  position: relative;
  z-index: 1003;
  display: block;
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 2.75rem;
  padding: 0.625rem;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-circle);
  background: var(--color-bg-surface);
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 0.3125rem 0;
  background: var(--color-text-default);
  transition:
    transform var(--transition),
    opacity var(--transition);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.navigation-backdrop {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: block;
  visibility: hidden;
  border: 0;
  background: var(--color-overlay);
  opacity: 0;
}

.navigation-backdrop.is-visible {
  visibility: visible;
  opacity: 1;
}

.main-navigation {
  position: fixed;
  z-index: 1004;
  top: 0;
  right: 0;
  bottom: 0;
  visibility: hidden;
  overflow-y: auto;
  width: 100%;
  margin: 0;
  /* Off-Canvas-Menü respektiert Notch/Status-Leiste und Home-Indikator. */
  padding:
    env(safe-area-inset-top, 0px)
    max(var(--space-md), env(safe-area-inset-right, 0px))
    calc(var(--space-lg) + env(safe-area-inset-bottom, 0px))
    max(var(--space-md), env(safe-area-inset-left, 0px));
  background: var(--color-bg-surface);
  box-shadow: var(--shadow-menu);
  opacity: 0;
  transform: translateX(100%);
}

.main-navigation.is-open {
  visibility: visible !important;
  opacity: 1 !important;
  transform: translateX(0) !important;
}

.main-navigation__mobile-head {
  position: sticky;
  z-index: 2;
  top: 0;
  display: flex;
  min-height: 4.25rem;
  align-items: center;
  justify-content: space-between;
  margin: 0 calc(-1 * var(--space-md)) var(--space-xs);
  padding: 0 var(--space-md);
  border-bottom: 1px solid var(--color-border-subtle);
  background: var(--color-bg-surface);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.main-navigation__close {
  position: relative;
  display: block;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-circle);
  background: transparent;
}

.main-navigation__close span {
  position: absolute;
  top: 1.25rem;
  left: 0.75rem;
  width: 1.125rem;
  height: 2px;
  background: var(--color-text-default);
}

.main-navigation__close span:first-child {
  transform: rotate(45deg);
}

.main-navigation__close span:last-child {
  transform: rotate(-45deg);
}

.main-navigation__list,
.submenu {
  margin: 0;
  padding: 0;
  list-style: none;
}

.main-navigation__list {
  display: flex;
  align-items: stretch;
  flex-direction: column;
}

.main-navigation__item {
  position: relative;
  border-bottom: 1px solid var(--color-border-subtle);
}

.main-navigation__item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.main-navigation__link {
  display: inline-flex;
  min-height: 3.125rem;
  flex: 1;
  align-items: center;
  padding: var(--space-xs) 0;
  color: var(--color-text-default);
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: var(--font-weight-medium);
  white-space: normal;
}

.main-navigation__link.is-active {
  color: var(--color-brand-primary);
}

.main-navigation__link::after {
  display: none;
}

.submenu-toggle {
  display: inline-grid;
  width: 3rem;
  height: 3.125rem;
  flex: 0 0 3rem;
  margin-left: var(--space-xs);
  padding: 0;
  place-items: center;
  border: 0;
  border-radius: var(--radius-circle);
  background: transparent;
  color: var(--color-text-muted);
}

.submenu-toggle svg {
  transition: transform var(--transition);
}

.submenu-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.submenu-toggle:hover,
.submenu-toggle:focus-visible {
  background: var(--color-brand-wash);
  color: var(--color-brand-primary);
}

.submenu {
  position: static;
  visibility: visible;
  overflow: hidden;
  width: auto;
  max-height: 0;
  padding: 0;
  border: 0;
  background: transparent;
  opacity: 1;
  transform: none;
  transition:
    max-height 260ms ease,
    padding-bottom 260ms ease;
}

.main-navigation__item.is-submenu-open > .submenu {
  max-height: 32.5rem;
  padding-bottom: var(--space-sm);
  transform: none;
}

.submenu::before {
  display: none;
}

.submenu__link {
  display: block;
  min-height: 2.75rem;
  padding: 0.625rem var(--space-sm);
  border-left: 2px solid var(--color-border-subtle);
  border-radius: 0 var(--radius-small) var(--radius-small) 0;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  line-height: 1.45;
}

.submenu__link:hover,
.submenu__link.is-active {
  border-left-color: var(--color-brand-accent);
  background: var(--color-bg-base);
  color: var(--color-brand-primary);
}

.main-navigation__contact {
  margin-top: var(--space-md);
  border-bottom: 0;
}

.main-navigation__cta {
  width: 100%;
  min-height: 3.125rem;
}

@media (min-width: 30rem) {
  .main-navigation {
    width: min(86vw, 23.75rem);
  }
}

@media (min-width: 74rem) {
  .site-header {
    backdrop-filter: blur(14px);
  }

  .site-header__inner {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    min-height: 4.75rem;
    gap: var(--space-lg);
  }

  .site-logo {
    width: 10.75rem;
    justify-self: start;
  }

  .site-logo img {
    height: 3.75rem;
  }

  .menu-toggle,
  .navigation-backdrop,
  .main-navigation__close,
  .main-navigation__mobile-head {
    display: none;
  }

  .main-navigation {
    position: static;
    visibility: visible;
    overflow: visible;
    width: auto;
    /* Mittlere Grid-Spalte: Die Navigation sitzt zentriert zwischen Logo
       und rechtem Rand, statt ganz nach rechts zu rutschen. */
    justify-self: center;
    margin: 0;
    padding: 0;
    background: transparent;
    box-shadow: none;
    opacity: 1;
    transform: none;
  }

  .main-navigation__list {
    align-items: center;
    flex-direction: row;
    gap: clamp(0.5rem, 0.9vw, 0.875rem);
  }

  .main-navigation__item {
    border-bottom: 0;
  }

  .main-navigation__link {
    position: relative;
    min-height: 2.5rem;
    padding: 0.375rem 0.3125rem;
    color: var(--color-text-muted);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 650;
    white-space: nowrap;
  }

  .main-navigation__link::after {
    position: absolute;
    right: 0.3125rem;
    bottom: 0.1875rem;
    left: 0.3125rem;
    display: block;
    height: 2px;
    background: var(--color-brand-accent);
    content: "";
    opacity: 0;
    transform: scaleX(0.4);
    transition:
      opacity var(--transition),
      transform var(--transition);
  }

  .main-navigation__link:hover,
  .main-navigation__link.is-active {
    color: var(--color-text-default);
  }

  .main-navigation__link:hover::after,
  .main-navigation__link.is-active::after {
    opacity: 1;
    transform: scaleX(1);
  }

  .submenu-toggle {
    width: 1.75rem;
    height: 2.5rem;
    flex-basis: 1.75rem;
    margin-left: -0.3125rem;
  }

  .submenu {
    position: absolute;
    z-index: 20;
    top: calc(100% + 0.625rem);
    left: 50%;
    visibility: hidden;
    overflow: visible;
    width: max-content;
    min-width: 15.625rem;
    max-width: 20.625rem;
    max-height: none;
    padding: 0.625rem;
    border: 1px solid var(--color-border-subtle);
    border-radius: 0.875rem;
    background: var(--color-surface-strong);
    box-shadow: var(--shadow-card);
    opacity: 0;
    transform: translate(-50%, -0.5rem);
    transition:
      visibility var(--transition),
      opacity var(--transition),
      transform var(--transition);
  }

  /* Unsichtbare Hover-Brücke überbrückt den Abstand zwischen Navigation
     und Dropdown, damit das Menü beim Bewegen des Mauszeigers offen bleibt. */
  .submenu::before {
    position: absolute;
    right: 0;
    bottom: 100%;
    left: 0;
    display: block;
    height: 0.75rem;
    content: "";
  }

  .main-navigation__item:hover > .submenu,
  .main-navigation__item:focus-within > .submenu,
  .main-navigation__item.is-submenu-open > .submenu {
    visibility: visible;
    max-height: none;
    padding: 0.625rem;
    opacity: 1;
    transform: translate(-50%, 0);
  }

  .submenu__link {
    min-height: 0;
    padding: 0.6875rem 0.8125rem;
    border-left: 0;
    border-radius: 0.5625rem;
    font-size: 0.85rem;
  }

  .main-navigation__contact {
    margin: 0 0 0 0.3125rem;
  }

  .main-navigation__cta {
    width: auto;
    min-height: 2.5rem;
    padding-inline: 1rem;
    font-size: 0.875rem;
  }
}

/* The complete navigation remains available when JavaScript is disabled. */
.no-js .menu-toggle,
.no-js .main-navigation__mobile-head,
.no-js .navigation-backdrop,
.no-js .submenu-toggle {
  display: none;
}

.no-js .site-header__inner {
  flex-wrap: wrap;
}

.no-js .main-navigation {
  position: static;
  width: 100%;
  max-width: none;
  height: auto;
  max-height: none;
  visibility: visible;
  overflow: visible;
  opacity: 1;
  transform: none;
  background: transparent;
  box-shadow: none;
}

.no-js .main-navigation__list {
  display: grid;
  gap: var(--space-xs);
  padding-block: var(--space-md);
}

.no-js .main-navigation__item {
  display: block;
}

.no-js .main-navigation__item-row {
  display: block;
}

.no-js .submenu {
  position: static;
  display: grid;
  min-width: 0;
  visibility: visible;
  gap: var(--space-2xs);
  margin: 0;
  padding: 0 0 var(--space-sm) var(--space-md);
  opacity: 1;
  transform: none;
  background: transparent;
  box-shadow: none;
  pointer-events: auto;
}