/* ══════════════════════════════════════════════════════
   NAV.CSS — Site Header & Navigation
   Desktop : Apple-style frosted-glass, mega-menu
   Mobile  : slide-down panel avec sous-panneau Expertises
   ══════════════════════════════════════════════════════ */

/* ── SITE HEADER ── */
.site-header {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 200;
  height: 52px;
  background: transparent;
  border-bottom: none;
}

/* ── NAV BACKDROP (couche verre unique, couvre header + mega-menu) ── */
.nav-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 52px;
  background: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  border-bottom: 1px solid transparent;
  pointer-events: none;
  z-index: 195;
  -webkit-transition: height 0.22s cubic-bezier(0.32, 0.72, 0, 1), background 0.35s ease, -webkit-backdrop-filter 0.35s ease, border-color 0.35s ease;
  transition: height 0.22s cubic-bezier(0.32, 0.72, 0, 1), background 0.35s ease, backdrop-filter 0.35s ease, border-color 0.35s ease;
}

/* État 1 : scroll partiel sur hero — flou discret, texte blanc */
.nav-backdrop.header-scrolled {
  background: rgba(26, 26, 46, 0.18);
  -webkit-backdrop-filter: saturate(140%) blur(16px);
  backdrop-filter: saturate(140%) blur(16px);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

/* État 2 : fond blanc — fond clair, texte foncé */
.nav-backdrop.header-opaque {
  background: rgba(255, 255, 255, 0.92);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom-color: rgba(45, 63, 92, 0.08);
}

/* Mega-menu ouvert : le backdrop s'étend pour couvrir le menu */
.nav-backdrop.mega-open {
  border-bottom-color: rgba(255, 255, 255, 0.12);
}
.nav-backdrop.mega-open.header-opaque {
  border-bottom-color: rgba(45, 63, 92, 0.12);
}

/* Menu mobile ouvert */
.nav-backdrop.menu-open {
  background: rgba(255, 255, 255, 0.97);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom-color: transparent;
}

.header-inner {
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  -webkit-justify-content: space-between;
  justify-content: space-between;
  height: 100%;
  padding: 0 48px;
  max-width: 1440px;
  margin: 0 auto;
}

/* ── LOGO ── */
.nav-logo {
  font-family: 'Raleway', sans-serif;
  font-weight: 400;
  font-size: 18px;
  letter-spacing: 0.15em;
  color: var(--blanc);
  text-decoration: none;
  -webkit-transition: color 0.3s ease;
  transition: color 0.3s ease;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
}
.nav-logo span { font-weight: 200; }

.site-header.header-opaque .nav-logo { color: var(--bleu-nuit); }

/* ── DESKTOP NAV ── */
.nav-desktop {
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  gap: 36px;
}

.nav-desktop a,
.nav-exp-btn {
  font-family: 'Raleway', sans-serif;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  position: relative;
  -webkit-transition: color 0.2s ease;
  transition: color 0.2s ease;
  display: -webkit-inline-flex;
  display: inline-flex;
  -webkit-align-items: center;
  align-items: center;
  gap: 5px;
}

.nav-desktop a.active { color: var(--blanc); }

.site-header.header-opaque .nav-desktop a,
.site-header.header-opaque .nav-exp-btn {
  color: var(--bleu-ardoise);
}

.site-header.header-opaque .nav-desktop a.active {
  color: var(--bleu-nuit);
}

/* Chevron Expertises */
.nav-exp-chevron {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  -webkit-transform: translateY(-1px) rotate(45deg);
  transform: translateY(-1px) rotate(45deg);
  -webkit-transition: -webkit-transform 0.2s ease;
  transition: transform 0.2s ease;
}

/* ── MEGA MENU (desktop Expertises) ── */
.mega-menu {
  position: fixed;
  top: 52px;
  left: 0;
  right: 0;
  background: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  border-bottom: none;
  padding: 28px 48px;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
  gap: 10px;
  pointer-events: none;
  -webkit-clip-path: inset(0 0 100% 0);
  clip-path: inset(0 0 100% 0);
  -webkit-transition: -webkit-clip-path 0.22s cubic-bezier(0.32, 0.72, 0, 1), background 0.35s ease;
  transition: clip-path 0.22s cubic-bezier(0.32, 0.72, 0, 1), background 0.35s ease;
  z-index: 199;
}

.mega-menu.open {
  pointer-events: auto;
  -webkit-clip-path: inset(0 0 0% 0);
  clip-path: inset(0 0 0% 0);
  -webkit-transition: none;
  transition: none;
}

.mega-menu a {
  font-family: 'Raleway', sans-serif;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  padding: 11px 22px;
  border: none;
  -webkit-transition: color 0.2s;
  transition: color 0.2s;
  white-space: nowrap;
}

.mega-menu a:hover {
  color: rgba(255, 255, 255, 1);
}


/* Mega-menu : transparent — le nav-backdrop fournit le verre unifié */
.site-header.header-opaque .mega-menu {
  border-bottom: none;
}

.site-header.header-opaque .mega-menu a {
  color: var(--bleu-ardoise);
}
.site-header.header-opaque .mega-menu a:hover {
  color: var(--bleu-nuit);
}

/* ── PAGE BLUR OVERLAY (desktop mega-menu) ── */
.page-blur-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.18);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  z-index: 190;
  opacity: 0;
  pointer-events: none;
  -webkit-transition: opacity 0.35s ease;
  transition: opacity 0.35s ease;
}

.page-blur-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* ── BURGER ── */
.nav-burger {
  display: none;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-align-items: center;
  align-items: center;
  -webkit-justify-content: center;
  justify-content: center;
  gap: 4.5px;
  min-width: 44px;
  min-height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

.nav-burger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: rgba(255, 255, 255, 0.88);
  -webkit-transform-origin: center;
  transform-origin: center;
  -webkit-transition: background 0.3s, -webkit-transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s;
  transition: background 0.3s, transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s;
}

.site-header.header-opaque .nav-burger span { background: var(--bleu-ardoise); }

/* Burger → ✕ */
.nav-burger[aria-expanded="true"] span:nth-child(1) {
  -webkit-transform: translateY(6px) rotate(45deg);
  transform: translateY(6px) rotate(45deg);
}
.nav-burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  -webkit-transform: scaleX(0);
  transform: scaleX(0);
}
.nav-burger[aria-expanded="true"] span:nth-child(3) {
  -webkit-transform: translateY(-6px) rotate(-45deg);
  transform: translateY(-6px) rotate(-45deg);
}

/* ── MOBILE MENU ── */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.96);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  backdrop-filter: saturate(180%) blur(24px);
  z-index: 197;
  overflow: hidden;
  -webkit-clip-path: inset(0 0 100% 0);
  clip-path: inset(0 0 100% 0);
  -webkit-transition: -webkit-clip-path 0.52s cubic-bezier(0.32, 0.72, 0, 1);
  transition: clip-path 0.52s cubic-bezier(0.32, 0.72, 0, 1);
  pointer-events: none;
}

.mobile-menu.open {
  -webkit-clip-path: inset(0 0 0% 0);
  clip-path: inset(0 0 0% 0);
  pointer-events: auto;
}

/* Panel slider */
.menu-panels {
  display: -webkit-flex;
  display: flex;
  width: 200%;
  height: 100%;
  -webkit-transition: -webkit-transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.menu-panels.show-sub {
  -webkit-transform: translateX(-50%);
  transform: translateX(-50%);
}

.menu-panel {
  width: 50%;
  height: 100%;
  overflow-y: auto;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-justify-content: flex-start;
  justify-content: flex-start;
  padding: 100px 0 32px;
}

.menu-panel a,
.menu-exp-btn,
.back-btn {
  display: block;
  width: 100%;
  padding: 18px 40px;
  font-family: 'Raleway', sans-serif;
  font-size: 17px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--bleu-nuit);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  opacity: 0;
  -webkit-transform: translateY(12px);
  transform: translateY(12px);
  -webkit-transition: opacity 0.4s ease, -webkit-transform 0.4s ease, color 0.15s;
  transition: opacity 0.4s ease, transform 0.4s ease, color 0.15s;
  -webkit-tap-highlight-color: transparent;
}

/* Stagger d'apparition des liens */
.mobile-menu.open .back-btn                   { opacity: 1; -webkit-transform: none; transform: none; -webkit-transition-delay: 0.18s; transition-delay: 0.18s; }
.mobile-menu.open .menu-panel a:nth-child(1),
.mobile-menu.open .menu-exp-btn:nth-child(1)  { opacity: 1; -webkit-transform: none; transform: none; -webkit-transition-delay: 0.18s; transition-delay: 0.18s; }
.mobile-menu.open .menu-panel a:nth-child(2),
.mobile-menu.open .menu-exp-btn:nth-child(2)  { opacity: 1; -webkit-transform: none; transform: none; -webkit-transition-delay: 0.24s; transition-delay: 0.24s; }
.mobile-menu.open .menu-panel a:nth-child(3),
.mobile-menu.open .menu-exp-btn:nth-child(3)  { opacity: 1; -webkit-transform: none; transform: none; -webkit-transition-delay: 0.30s; transition-delay: 0.30s; }
.mobile-menu.open .menu-panel a:nth-child(4),
.mobile-menu.open .menu-exp-btn:nth-child(4)  { opacity: 1; -webkit-transform: none; transform: none; -webkit-transition-delay: 0.36s; transition-delay: 0.36s; }
.mobile-menu.open .menu-panel a:nth-child(5),
.mobile-menu.open .menu-exp-btn:nth-child(5)  { opacity: 1; -webkit-transform: none; transform: none; -webkit-transition-delay: 0.42s; transition-delay: 0.42s; }
.mobile-menu.open .menu-panel a:nth-child(6),
.mobile-menu.open .menu-exp-btn:nth-child(6)  { opacity: 1; -webkit-transform: none; transform: none; -webkit-transition-delay: 0.48s; transition-delay: 0.48s; }

.menu-panel a:active { opacity: 0.5; }

.menu-exp-btn {
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
  -webkit-justify-content: space-between;
  justify-content: space-between;
}

.menu-exp-btn .nav-exp-chevron {
  -webkit-transform: rotate(-45deg) translateY(0);
  transform: rotate(-45deg) translateY(0);
}

.back-btn {
  padding: 18px 40px;
  margin-bottom: 8px;
  display: -webkit-flex;
  display: flex;
  -webkit-align-items: center;
  align-items: center;
}

.back-chevron {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-left: 1.5px solid var(--bleu-ardoise);
  border-bottom: 1.5px solid var(--bleu-ardoise);
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}

.menu-panel a.active { color: var(--bleu-nuit); font-weight: 500; }

.menu-panel a.nav-exp-cnaps {
  color: var(--bleu-nuit);
  font-weight: 500;
}

/* ── ACCESSIBILITÉ : mouvement réduit ── */
@media (prefers-reduced-motion: reduce) {
  .site-header,
  .nav-backdrop,
  .mega-menu,
  .mobile-menu,
  .menu-panels,
  .nav-exp-chevron,
  .nav-desktop a::after,
  .nav-burger span,
  .page-blur-overlay { transition: none !important; }
}

/* ── RESPONSIVE ── */
@media (min-width: 901px) {
  .nav-burger { display: none !important; }
  .mobile-menu { display: none !important; }
}

@media (max-width: 900px) {
  .nav-desktop { display: none !important; }
  .mega-menu { display: none !important; }
  .nav-burger { display: -webkit-flex; display: flex; }
  .header-inner { padding: 0 20px; }
  .nav-logo { font-size: 16px; }
  .site-header { z-index: 200; }
  /* Header opaque quand le menu mobile est ouvert (background via nav-backdrop) */
  .site-header.menu-open .nav-logo { color: var(--bleu-nuit); }
  .site-header.menu-open .nav-burger span { background: var(--bleu-ardoise); }
}