.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--c-bg);
  transition: box-shadow var(--t-base) var(--ease-out),
              background var(--t-base) var(--ease-out);
}
.site-header.scrolled {
  box-shadow: var(--shadow-sm);
  background: var(--c-bg-elevated);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);

  height: 124px;
  transition: height var(--t-base) var(--ease-out);
}

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--c-text);
  font-weight: var(--fw-semibold);
  flex-shrink: 0;
}

.logo-link img {
  height: 82px;
  width: auto;
  transition: height var(--t-base) var(--ease-out);
}
@media (min-width: 768px) {
  .logo-link img { height: 106px; }
}

.header-stack {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 9px;
  flex: 1;
  min-width: 0;
}

.utility-nav {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}
.utility-nav a {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  color: var(--c-text);
  font-weight: var(--fw-medium);
  font-size: var(--fs-sm);
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease-out);
}
.utility-nav a:hover { color: var(--c-brand); }
.utility-nav a svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  stroke-width: 1.6;
  fill: none;
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--sp-8);
}
.main-nav a,
.hero-tab {
  position: relative;
  padding: var(--sp-1) 0;
  color: var(--c-brand);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-base);
  letter-spacing: var(--letter-tight);
  transition: color var(--t-fast) var(--ease-out);
  /* button reset for .hero-tab (which can be <button> or <a>) */
  border: none;
  background: transparent;
  cursor: pointer;
}
.main-nav a::after,
.hero-tab::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--c-brand);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--t-base) var(--ease-out);
}
.main-nav a:hover,
.main-nav a.active,
.hero-tab:hover,
.hero-tab.is-active { color: var(--c-brand-dark); }
.main-nav a:hover::after,
.main-nav a.active::after,
.hero-tab:hover::after,
.hero-tab.is-active::after { transform: scaleX(1); }

.main-nav .nav-extra { display: none; }

.nav-dropdown {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.nav-dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--sp-1) 0;
  color: var(--c-brand);
  font-family: inherit;
  font-weight: var(--fw-semibold);
  font-size: var(--fs-base);
  letter-spacing: var(--letter-tight);
  transition: color var(--t-fast) var(--ease-out);
}
.nav-dropdown-toggle:hover,
.nav-dropdown:hover .nav-dropdown-toggle,
.nav-dropdown-toggle[aria-expanded="true"] { color: var(--c-brand-dark); }

.nav-dropdown-caret {
  width: 16px;
  height: 16px;
  transition: transform var(--t-base) var(--ease-out);
}
.main-nav:not(.is-panel) .nav-dropdown:hover .nav-dropdown-caret,
.main-nav:not(.is-panel) .nav-dropdown-toggle[aria-expanded="true"] .nav-dropdown-caret {
  transform: rotate(180deg);
}

/* Shared visual styles for flyout menus (DRY) */
.nav-dropdown-menu,
.custom-select-menu {
  background: var(--c-bg);
  border: var(--border-thin) solid var(--c-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--sp-2);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--t-base) var(--ease-out),
              transform var(--t-base) var(--ease-out);
}

/* Nav dropdown specific positioning + closed state (drops down) */
.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + var(--sp-2));
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  min-width: 220px;
}

.main-nav:not(.is-panel) .nav-dropdown:hover .nav-dropdown-menu,
.main-nav:not(.is-panel) .nav-dropdown.open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);

  transition: opacity var(--t-base) var(--ease-out),
              transform var(--t-base) var(--ease-out);
}
.nav-dropdown-menu a {
  display: block;
  padding: var(--sp-3) var(--sp-3);
  border-radius: var(--r-sm);
  color: var(--c-text);
  font-weight: var(--fw-medium);
  font-size: var(--fs-base);
  white-space: nowrap;
  transition: background var(--t-fast) var(--ease-out),
              color var(--t-fast) var(--ease-out);
}
.nav-dropdown-menu a::after { content: none; }
.nav-dropdown-menu a:hover {
  background: var(--c-brand-tint);
  color: var(--c-brand-dark);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  background: transparent;
  border: none;
  padding: var(--sp-1) var(--sp-2);
  cursor: pointer;
  border-radius: var(--r-sm);
  color: var(--c-brand);
}
.nav-toggle svg { width: 28px; height: 28px; stroke: currentColor; }
.nav-toggle-label {
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  letter-spacing: var(--letter-wide);
  text-transform: lowercase;
}

.nav-toggle .icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .icon-burger { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: block; }

.account-icon {
  display: none;
  align-items: center;
  justify-content: center;
  width: var(--tap-min);
  height: var(--tap-min);
  border-radius: var(--r-full);
  color: var(--c-brand);
  transition: background var(--t-fast) var(--ease-out),
              color var(--t-fast) var(--ease-out);
}
.account-icon:hover { background: var(--c-brand-tint); color: var(--c-brand-dark); }
.account-icon svg { width: 24px; height: 24px; }

.main-nav.is-panel {
  position: absolute;
  top: calc(100% + var(--sp-2));
  right: var(--sp-4);
  left: auto;
  width: 320px;
  max-width: calc(100vw - var(--sp-8));
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 0;
  background: var(--c-bg);
  border: var(--border-thin) solid var(--c-border);
  border-radius: var(--r-lg);
  padding: var(--sp-5);

  transform-origin: top right;
  transform: scaleY(0.85) translateY(-8px);
  opacity: 0;
  pointer-events: none;

  transition: none;
  visibility: hidden;
  box-shadow: var(--shadow-xl);
}
.main-nav.is-panel.open {
  transform: scaleY(1) translateY(0);
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
  transition: transform var(--t-base) var(--ease-out),
              opacity var(--t-base) var(--ease-out);
}
.main-nav.is-panel a {
  padding: var(--sp-3) var(--sp-2);
  border-radius: var(--r-sm);
  font-size: var(--fs-md);
  min-height: var(--tap-min);
  display: flex;
  align-items: center;
}
.main-nav.is-panel a::after { display: none; }
.main-nav.is-panel a:hover { background: var(--c-brand-tint); }

.main-nav.is-panel .nav-extra {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  color: var(--c-text);
  font-weight: var(--fw-medium);
  font-size: var(--fs-base);
}
.main-nav.is-panel .nav-extra svg {
  width: 22px;
  height: 22px;
  stroke: var(--c-brand);
  fill: none;
  flex-shrink: 0;
}
.main-nav.is-panel a.nav-extra + a.nav-extra {
  margin-top: var(--sp-1);
}

/* Underline for filter sections in recherche (DRY from main-nav) */
.filter-drawer__section > h3::after {
  content: '';
  flex: 1;
  height: 2px;
  max-width: 40px;
  background: var(--c-accent);
  border-radius: var(--r-full);
}

.main-nav.is-panel .nav-dropdown {
  display: block;
  width: 100%;
}
.main-nav.is-panel .nav-dropdown-toggle {
  width: 100%;
  justify-content: space-between;
  padding: var(--sp-3) var(--sp-2);
  font-size: var(--fs-md);
}
.main-nav.is-panel .nav-dropdown-menu {
  position: static;
  transform: none;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  min-width: 0;
  border: none;
  box-shadow: none;
  background: transparent;
  padding: 0 0 0 var(--sp-4);
  transition: none;
}
.main-nav.is-panel .nav-dropdown-caret { display: none; }

.nav-divider { display: none; }
.main-nav.is-panel .nav-divider {
  display: block;
  height: var(--border-thin);
  background: var(--c-border);
  margin: var(--sp-5) var(--sp-2);
}

@media (min-width: 880px) {

  .site-header.scrolled .header-inner { height: 82px; }
  .site-header.scrolled .logo-link img { height: 70px; }

  .site-header.scrolled .utility-nav,
  .site-header.scrolled .main-nav:not(.is-panel) {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
  }

  .site-header.scrolled .header-stack { flex: 0; }

  .site-header.scrolled .nav-toggle { display: inline-flex; }
  .site-header.scrolled .account-icon { display: inline-flex; }
}

@media (max-width: 879px) {

  .header-inner { height: 84px; justify-content: space-between; }
  .logo-link img { height: 66px; }
  .utility-nav,
  .main-nav:not(.is-panel) {
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    position: absolute;
  }
  .header-stack { flex: 0; }
  .nav-toggle { display: inline-flex; }
  .account-icon { display: inline-flex; }

  /* Disposition mobile standard (pattern burger / logo / compte) :
     menu à GAUCHE, logo CENTRÉ, compte à DROITE - repères stables aux
     deux pouces, logo mis en valeur. `display: contents` éclate
     .header-actions pour réordonner ses enfants dans le flex parent. */
  .header-actions { display: contents; }
  .nav-toggle { order: -1; }
  .logo-link { order: 0; margin-inline: auto; }
  .account-icon { order: 1; }

  /* Le panneau du menu suit le burger, désormais à gauche. */
  .main-nav.is-panel {
    right: auto;
    left: var(--sp-4);
    transform-origin: top left;
  }
}