body.nav-open {
  overflow: hidden;
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid var(--color-border-warm);
  background: var(--color-ivoire);
}

.site-header__inner {
  display: flex;
  align-items: center;
  min-height: 4.25rem;
  gap: var(--space-3);
}

.site-header__brand {
  display: inline-flex;
  flex: 0 0 3.5rem;
  align-items: center;
  min-width: 0;
  color: var(--color-encre);
}

.site-header__brand img {
  display: block;
  width: 3.5rem;
  height: 3.5rem;
  object-fit: contain;
}

.site-header__toggle {
  display: inline-grid;
  flex: 0 0 2.75rem;
  place-content: center;
  gap: 0.25rem;
  min-height: 2.75rem;
  margin-left: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-blanc-perle);
  color: var(--color-encre);
  cursor: pointer;
}

.site-header__toggle-line {
  display: block;
  width: 1.25rem;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(0.375rem) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
  transform: translateY(-0.375rem) rotate(-45deg);
}

.site-header__nav {
  position: fixed;
  z-index: 9999;
  top: 4.25rem;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100vw;
  height: calc(100vh - 4.25rem);
  height: calc(100dvh - 4.25rem);
  display: flex;
  visibility: hidden;
  flex-direction: column;
  overflow-y: auto;
  background: var(--color-ivoire);
  padding: var(--space-5) var(--container-gutter) var(--space-7);
  box-shadow: var(--shadow-soft);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base), visibility var(--transition-base);
  -webkit-overflow-scrolling: touch;
}

.site-header__nav.is-open {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

.site-header__nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-list li,
.site-header__nav-list li + li {
  margin: 0;
  padding: 0;
}

.site-header__nav-list a {
  display: flex;
  align-items: center;
  min-height: 2.875rem;
  border: 1px solid var(--color-border-warm);
  border-radius: var(--radius-md);
  background: var(--color-blanc-perle);
  padding: var(--space-2) var(--space-4);
  color: var(--color-encre);
  font-size: var(--text-base);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.site-header__nav-list a:hover,
.site-header__nav-list a[aria-current="page"] {
  border-color: var(--color-champagne);
  background: var(--color-beige-doux);
  color: var(--color-bleu-royal-fonce);
}

.site-header__nav-action {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border-warm);
}

.site-header__nav-action .button {
  width: 100%;
}

@media (min-width: 70rem) {
  .site-header__inner {
    min-height: 4.75rem;
    gap: var(--space-5);
  }

  .site-header__brand {
    flex-basis: 4rem;
  }

  .site-header__brand img {
    width: 4rem;
    height: 4rem;
  }

  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    position: static;
    display: flex;
    visibility: visible;
    flex: 1 1 auto;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    overflow: visible;
    min-width: 0;
    width: auto;
    height: auto;
    background: transparent;
    padding: 0;
    box-shadow: none;
    opacity: 1;
    pointer-events: auto;
  }

  .site-header__nav-list {
    flex: 1 1 auto;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: clamp(0.15rem, 0.8vw, 0.75rem);
    min-width: 0;
  }

  .site-header__nav-list a {
    min-height: 2.75rem;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    padding: 0.5rem clamp(0.3rem, 0.6vw, 0.625rem);
    font-size: var(--text-sm);
    line-height: 1.2;
    white-space: nowrap;
  }

  .site-header__nav-mobile-link {
    display: none;
  }

  .site-header__nav-action {
    flex: 0 0 auto;
    margin: 0;
    padding: 0;
    border-top: none;
  }

  .site-header__nav-action .button {
    width: auto;
    min-height: 2.75rem;
    padding-inline: 0.875rem;
    font-size: var(--text-sm);
    white-space: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__nav,
  .site-header__toggle-line {
    transition: none;
  }
}