/* ==========================================================================
   Layout — barre d'annonce + header + navigation
   ========================================================================== */

.announce-bar {
  background: linear-gradient(90deg, var(--color-accent-strong), var(--color-accent));
  color: var(--color-text-on-accent);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: center;
  padding: var(--space-2) var(--space-4);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(18, 20, 20, 0.72);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  /* Contrainte projet : compositing des éléments fixes */
  transform: translateZ(0);
  will-change: transform;
  transition: background var(--duration-fast) var(--ease-out-expo);
}

.site-header.is-scrolled {
  background: rgba(18, 20, 20, 0.92);
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  min-height: 74px;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.brand-logo {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 0 0 2px rgba(243, 207, 220, 0.35);
}

.brand-name {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  font-size: var(--text-xl);
  color: var(--color-accent-soft);
  white-space: nowrap;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.4vw, 2.2rem);
}

.main-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--duration-fast) var(--ease-out-expo);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-base) var(--ease-out-expo);
}

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  color: var(--color-text);
  transition: background var(--duration-fast) var(--ease-out-expo),
    color var(--duration-fast) var(--ease-out-expo);
}

.icon-btn:hover {
  background: var(--glass-bg-strong);
  color: var(--color-accent);
}

.icon-btn svg {
  width: 21px;
  height: 21px;
}

.cart-btn {
  position: relative;
}

.cart-count {
  position: absolute;
  top: 2px;
  right: 0;
  min-width: 18px;
  height: 18px;
  padding-inline: 5px;
  display: grid;
  place-items: center;
  background: var(--color-accent);
  color: var(--color-text-on-accent);
  font-size: 11px;
  font-weight: 700;
  border-radius: var(--radius-pill);
  transform: scale(0);
}

.cart-count.has-items {
  transform: scale(1);
  transition: transform var(--duration-fast) var(--ease-out-expo);
}

/* ---- Burger + menu mobile ---- */
.nav-toggle {
  display: none;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-pill);
  transition: transform var(--duration-base) var(--ease-out-expo),
    opacity var(--duration-fast) var(--ease-out-expo);
}

.nav-toggle span + span {
  margin-top: 5px;
}

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

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

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

@media (max-width: 900px) {
  .nav-toggle {
    display: block;
  }

  /* Contrainte projet : menu mobile en opacity + visibility,
     jamais translateX (compatibilité RTL/LTR).
     Le header (transform + backdrop-filter) est le containing block des
     descendants fixed : on dimensionne donc en unités viewport, ancré au
     header sticky collé en haut. */
  .main-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: var(--z-overlay);
    display: grid;
    place-items: center;
    background: rgba(18, 20, 20, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--duration-base) var(--ease-out-expo),
      visibility 0s linear var(--duration-base);
  }

  .main-nav.is-open {
    opacity: 1;
    visibility: visible;
    transition: opacity var(--duration-base) var(--ease-out-expo);
  }

  .main-nav ul {
    flex-direction: column;
    gap: var(--space-5);
    text-align: center;
  }

  .main-nav a {
    font-size: var(--text-xl);
    font-family: var(--font-display);
  }

  .nav-toggle {
    position: relative;
    z-index: var(--z-drawer);
  }
}