/* =========================================================================
   layout.css — Grille, container, header/footer, responsive
   Mobile-first. Breakpoints : 640 / 900 / 1200px.
   ========================================================================= */

.lt-container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--sp-md);
}

.lt-section {
  padding-block: var(--sp-xl);
}

@media (min-width: 900px) {
  .lt-section { padding-block: var(--sp-2xl); }
}

.lt-section--alt { background: var(--c-bg-alt); }

.lt-section__head {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: var(--sp-xl);
}
.lt-section__head .lt-lead { margin-inline: auto; }

/* --- Grilles génériques --------------------------------------------------*/
.lt-grid {
  display: grid;
  gap: var(--sp-md);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .lt-grid--2 { grid-template-columns: repeat(2, 1fr); }
  .lt-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .lt-grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .lt-grid--3 { grid-template-columns: repeat(3, 1fr); }
  .lt-grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* --- Header ---------------------------------------------------------------*/
.lt-header {
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(15, 25, 35, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
}

.lt-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-md);
  padding-block: var(--sp-sm);
  min-height: 92px;
}

.lt-header__logo { display: flex; align-items: center; flex-shrink: 0; }
.lt-header__logo img { height: 64px; width: auto; }

.lt-nav__list {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

.lt-nav__list a {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--c-text-muted);
  transition: color var(--transition);
}
.lt-nav__list a:hover,
.lt-nav__list a:focus-visible { color: var(--c-text); }

.lt-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
}

.lt-header__cta { display: none; }

.lt-header__burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  flex-shrink: 0;
}
.lt-header__burger-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-text);
  transition: transform var(--transition), opacity var(--transition);
}
.lt-header__burger[aria-expanded="true"] .lt-header__burger-bar:nth-child(2) {
  transform: translateY(7px) rotate(45deg);
}
.lt-header__burger[aria-expanded="true"] .lt-header__burger-bar:nth-child(3) {
  opacity: 0;
}
.lt-header__burger[aria-expanded="true"] .lt-header__burger-bar:nth-child(4) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Contenu collapsible : nav + switch + téléphone, tout sauf le logo --- */
@media (max-width: 1023px) {
  .lt-header__collapse {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-bg-alt);
    border-bottom: 1px solid var(--c-border);
    padding: var(--sp-md);
    max-height: calc(100vh - 92px);
    overflow-y: auto;
  }
  .lt-header__collapse[data-open="true"] { display: block; }
  .lt-nav__list { flex-direction: column; align-items: flex-start; gap: var(--sp-sm); }
  .lt-header__actions { flex-direction: column; align-items: stretch; gap: var(--sp-sm); margin-top: var(--sp-md); }
  .lt-header__cta { display: inline-flex; justify-content: center; }
  .lt-profile-switch--compact { width: 100%; justify-content: center; }
}

@media (min-width: 1024px) {
  .lt-header__collapse {
    display: flex;
    align-items: center;
    gap: var(--sp-lg);
  }
  .lt-header__cta { display: inline-flex; }
  .lt-header__burger { display: none; }
}

/* --- Footer -----------------------------------------------------------*/
.lt-footer { background: var(--c-bg-alt); border-top: 1px solid var(--c-border); }

.lt-footer__inner {
  display: grid;
  gap: var(--sp-lg);
  padding-block: var(--sp-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 900px) {
  .lt-footer__inner { grid-template-columns: 1.2fr 1fr 1fr; }
}

.lt-footer__brand img { margin-bottom: var(--sp-sm); }
.lt-footer__address { color: var(--c-text-muted); font-size: var(--fs-small); }

.lt-footer__nav-list { display: flex; flex-direction: column; gap: var(--sp-xs); }
.lt-footer__nav-list a { color: var(--c-text-muted); font-size: var(--fs-small); }
.lt-footer__nav-list a:hover { color: var(--c-text); }

.lt-footer__contact { display: flex; flex-direction: column; gap: var(--sp-xs); }
.lt-footer__contact a { color: var(--c-text-muted); font-size: var(--fs-small); }
.lt-footer__contact a:hover { color: var(--c-accent); }

.lt-footer__bottom { border-top: 1px solid var(--c-border); }
.lt-footer__bottom-inner {
  display: flex;
  flex-direction: column;
  gap: var(--sp-xs);
  padding-block: var(--sp-md);
  font-size: var(--fs-small);
  color: var(--c-text-dim);
}

@media (min-width: 640px) {
  .lt-footer__bottom-inner { flex-direction: row; justify-content: space-between; }
}

.lt-footer__legal-links { display: flex; gap: var(--sp-sm); flex-wrap: wrap; }
.lt-footer__legal-links a:hover { color: var(--c-text-muted); }

/* --- 404 ----------------------------------------------------------------*/
.lt-404 { text-align: center; }
.lt-404 .lt-h1 { margin-block: var(--sp-sm); }
.lt-404 .lt-lead { margin-inline: auto; margin-bottom: var(--sp-lg); }