/* ============================================
   LAYOUT.CSS — conteneur, sections, en-tête, navigation, pied de page
   ============================================ */

/* --- Conteneur & sections --- */

.container {
  width: 100%;
  max-width: calc(var(--max-width-site) + 2 * var(--space-xl));
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.section {
  padding: var(--space-4xl) 0;
}

.section--dark {
  background-color: var(--color-primary);
  color: var(--color-text-light);
}

.section-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  max-width: var(--max-width-header);
  margin: 0 auto var(--space-3xl);
  text-align: center;
}

.section-title {
  font-size: var(--font-size-h2);
}

.section-intro {
  max-width: var(--max-width-text);
}

.section-actions {
  display: flex;
  justify-content: center;
  margin-top: var(--space-3xl);
}

/* --- En-tête --- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: var(--color-secondary);
  transition: box-shadow var(--transition-base);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-md);
}

/* --- Retour en haut --- */

.back-to-top {
  position: fixed;
  right: var(--space-xl);
  bottom: var(--space-xl);
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--size-touch);
  height: var(--size-touch);
  padding: 0;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  color: var(--color-text-light);
  transform: translateY(var(--space-sm));
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), background-color var(--transition-base);
  cursor: pointer;
  pointer-events: none;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background-color: var(--color-black);
  color: var(--color-text-light);
}

.back-to-top-icon {
  width: var(--size-icon-md);
  height: var(--size-icon-md);
}

.header-inner {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  padding: var(--space-lg) var(--space-xl);
}

.header-logo {
  display: block;
  flex-shrink: 0;
  width: var(--size-logo-header);
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-xl);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--size-touch);
  padding: 0 var(--space-sm);
  font-size: var(--font-size-nav);
  color: var(--color-text);
  text-decoration: none;
  text-underline-offset: 0.3em;
}

.nav-link:hover {
  text-decoration: underline;
  text-decoration-thickness: 1px;
}

.nav-link[aria-current='page'] {
  text-decoration: underline;
}

/* Bouton hamburger (visible seulement sur mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-xs);
  width: var(--size-touch);
  height: var(--size-touch);
  padding: var(--space-sm) var(--space-xs);
  border-radius: var(--radius-sm);
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: var(--size-line);
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded='true'] .nav-toggle-bar:nth-child(1) {
  transform: translateY(calc(var(--space-xs) + var(--size-line))) rotate(45deg);
}

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

.nav-toggle[aria-expanded='true'] .nav-toggle-bar:nth-child(3) {
  transform: translateY(calc(-1 * (var(--space-xs) + var(--size-line)))) rotate(-45deg);
}

/* --- Pied de page --- */

.site-footer {
  padding: var(--space-2xl) 0 var(--space-lg);
  background-color: var(--color-primary);
  color: var(--color-green-pale);
}

.footer-inner {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: var(--space-3xl);
  padding-bottom: var(--space-2xl);
}

.footer-logo {
  display: block;
  width: var(--size-logo-footer);
  margin-left: var(--space-3xl);
}

.footer-main {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.footer-nav,
.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md) var(--space-xl);
}

.footer-link {
  display: inline-flex;
  align-items: center;
  min-height: var(--size-touch);
  font-size: var(--font-size-xl);
  text-decoration: none;
}

.footer-link:hover,
.footer-contact-link:hover {
  text-decoration: underline;
  text-underline-offset: 0.3em;
}

.footer-contact-link {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
  text-decoration: none;
}

.footer-icon {
  width: var(--size-icon-sm);
  height: var(--size-icon-sm);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-legal {
  font-size: var(--font-size-legal);
  color: var(--color-text-light);
}

.footer-legal a {
  text-underline-offset: 0.2em;
}

/* --- Tablette → ≤ 1024px --- */
@media (max-width: 1024px) {
  .nav-list {
    gap: var(--space-md);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .footer-logo {
    margin-left: 0;
  }

  .footer-main {
    align-items: center;
  }

  .footer-nav,
  .footer-contact {
    justify-content: center;
  }

  .footer-contact-link {
    align-items: center;
  }
}

/* --- Mobile → ≤ 768px --- */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .section-header {
    margin-bottom: var(--space-xl);
  }

  .section-actions {
    margin-top: var(--space-xl);
  }

  .section-actions .btn {
    width: 100%;
  }

  .header-inner {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
  }

  .back-to-top {
    right: var(--space-lg);
    bottom: var(--space-lg);
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    display: none;
    width: 100%;
  }

  .nav.is-open {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: var(--space-sm) 0 var(--space-md);
  }

  .nav-link {
    width: 100%;
    padding: 0;
    border-bottom: 1px solid var(--color-bg);
  }

  .site-footer {
    padding: var(--space-xl) 0 var(--space-lg);
  }

  .footer-inner {
    gap: var(--space-xl);
    padding-bottom: var(--space-xl);
  }

  .footer-main {
    gap: var(--space-lg);
  }

  .footer-nav {
    flex-direction: column;
    align-items: center;
    gap: 0;
  }

  .footer-link {
    font-size: var(--font-size-md);
  }

  .footer-contact {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }

  .footer-contact-link {
    flex-direction: row;
  }
}