/* ==========================================================================
   HEADER — menu commun, identique et au même endroit sur toutes les pages
   ========================================================================== */

.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 80;
  height: calc(var(--header-h) + env(safe-area-inset-top, 0px));
  padding-top: env(safe-area-inset-top, 0px);
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--dur-ui) var(--ease-soie), backdrop-filter var(--dur-ui);
}

/* Fond discret une fois l'image dépassée (pages à défilement) */
.header::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(to bottom,
    color-mix(in oklab, var(--ground, var(--brun-profond)) 92%, transparent),
    color-mix(in oklab, var(--ground, var(--brun-profond)) 70%, transparent));
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--filet);
  opacity: 0;
  transition: opacity var(--dur-ui) var(--ease-soie);
  pointer-events: none;
}
.header.is-solid::before { opacity: 1; }

.nav { position: relative; }

.nav__list {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  align-items: center;
  gap: clamp(28px, 3.4vw, 60px);
}

.nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 0 12px;
  font-family: var(--font-titre);
  font-size: var(--t-nav);
  letter-spacing: var(--ls-nav);
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  color: var(--ivoire-voile);
  text-shadow: 0 1px 14px rgba(20, 19, 31, 0.65);
  transition: color var(--dur-ui) var(--ease-soie);
}
/* letter-spacing ajoute un espace après la dernière lettre : on le compense */
.nav__link span { margin-right: calc(var(--ls-nav) * -1); }

.nav__link::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 2px;
  width: 100%; height: 1px;
  background: var(--creme);
  transform: translateX(-50%) scaleX(0);
  transform-origin: center;
  transition: transform 420ms var(--ease-soie), opacity 420ms;
  opacity: 0.85;
}

.nav__link:hover { color: var(--creme); }
.nav__link:hover::after { transform: translateX(-50%) scaleX(0.35); opacity: 0.5; }

.nav__link[aria-current="page"] { color: var(--creme); }
.nav__link[aria-current="page"]::after { transform: translateX(-50%) scaleX(1); opacity: 0.85; }

/* — Bouton mobile — */
.nav__toggle {
  display: none;
  position: absolute;
  right: var(--gutter);
  top: calc(env(safe-area-inset-top, 0px) + (var(--header-h) - 40px) / 2);
  height: 40px;
  padding: 0 2px;
  align-items: center;
  gap: 12px;
  background: none; border: 0; cursor: pointer;
  color: var(--creme);
  font-family: var(--font-titre);
  font-size: var(--t-nav);
  letter-spacing: var(--ls-nav);
  text-transform: uppercase;
  z-index: 2;
}
.nav__toggle-lines { display: grid; gap: 6px; width: 22px; }
.nav__toggle-lines i {
  display: block; height: 1px; background: currentColor;
  transition: transform var(--dur-ui) var(--ease-soie), opacity var(--dur-ui);
}
.nav__toggle-lines i:nth-child(2) { width: 70%; justify-self: end; }

.nav__mark {
  display: none;
  font-family: var(--font-titre);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--ivoire-voile);
  text-decoration: none;
  text-shadow: 0 1px 14px rgba(20, 19, 31, 0.65);
  position: absolute;
  left: var(--gutter);
  top: calc(env(safe-area-inset-top, 0px) + var(--header-h) / 2);
  transform: translateY(-50%);
  z-index: 2;
}

@media (max-width: 1200px) {
  .header { justify-content: space-between; }
  .nav__toggle, .nav__mark { display: inline-flex; }

  .nav {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    background:
      radial-gradient(120% 70% at 50% 110%, rgba(155, 94, 72, 0.22), transparent 60%),
      var(--indigo-abysse);
    opacity: 0;
    visibility: hidden;
    transition: opacity 360ms var(--ease-soie), visibility 0s linear 360ms;
  }
  .header.is-open .nav {
    opacity: 1; visibility: visible;
    transition: opacity 360ms var(--ease-soie), visibility 0s;
  }
  .nav__list { flex-direction: column; gap: 34px; }
  .nav__link { font-size: 0.86rem; letter-spacing: 0.36em; padding: 8px 0 12px; }
  .nav__link span { margin-right: -0.36em; }

  .header.is-open .nav__toggle-lines i:nth-child(1) { transform: translateY(3.5px) rotate(45deg); }
  .header.is-open .nav__toggle-lines i:nth-child(2) { width: 100%; transform: translateY(-3.5px) rotate(-45deg); }
}