/* ============================================
   LAYOUT.CSS — En-tête, pied de page, grille, responsive
   Structure globale du site EBR Ingénierie
   ============================================ */

/* ---- En-tête (Header) ---- */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--c-white);
  transition: box-shadow var(--dur-fast) var(--ease);
}

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

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap-lg);
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  text-decoration: none;
  flex-shrink: 0;
}

.header__logo img {
  height: 40px;
  width: auto;
}

.header__logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-night);
  letter-spacing: -0.01em;
}

/* Navigation bureau */
.nav {
  display: flex;
  align-items: center;
  gap: var(--gap-xs);
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--c-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition:
    color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease);
}

.nav__link:hover {
  color: var(--c-primary);
  background-color: var(--c-light-bg);
}

.nav__link.active {
  color: var(--c-primary);
  font-weight: 600;
}

.nav__link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 16px;
  right: 16px;
  height: 2px;
  background-color: var(--c-primary);
  border-radius: 1px;
}

/* Sous-menu déroulant */
.nav__dropdown {
  position: relative;
}

.nav__dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  padding: var(--gap-sm) 0;
  background: var(--c-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--c-border);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition:
    opacity var(--dur-fast) var(--ease),
    visibility var(--dur-fast) var(--ease),
    transform var(--dur-fast) var(--ease);
  z-index: 100;
}

.nav__dropdown:hover .nav__dropdown-menu,
.nav__dropdown:focus-within .nav__dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav__dropdown-item {
  display: block;
  padding: 10px 20px;
  font-size: 0.875rem;
  color: var(--c-text);
  text-decoration: none;
  transition:
    background-color var(--dur-fast) var(--ease),
    color var(--dur-fast) var(--ease);
}

.nav__dropdown-item:hover {
  background-color: var(--c-light-bg);
  color: var(--c-primary);
}

.nav__dropdown-item.active {
  color: var(--c-primary);
  font-weight: 600;
  background-color: var(--c-light-bg);
}

/* Bouton CTA dans la navigation */
.nav__cta {
  margin-left: var(--gap-sm);
}

/* Supprimer le soulignement actif sur le bouton CTA gradient */
.nav__cta::after,
.nav__cta.active::after {
  display: none !important;
}

/* ---- Menu hamburger (mobile) ---- */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
  z-index: 1100;
}

.hamburger__bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--c-night);
  border-radius: 2px;
  transition:
    transform var(--dur-fast) var(--ease),
    opacity var(--dur-fast) var(--ease);
  transform-origin: center;
}

/* Animation hamburger ouvert */
.hamburger.open .hamburger__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.open .hamburger__bar:nth-child(2) {
  opacity: 0;
}

.hamburger.open .hamburger__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Overlay navigation mobile */
.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 360px;
  background-color: var(--c-white);
  z-index: 1050;
  padding: 96px var(--gap-lg) var(--gap-lg);
  transform: translateX(100%);
  transition: transform var(--dur) var(--ease);
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  pointer-events: none;
  visibility: hidden;
}

.mobile-nav.is-open {
  transform: translateX(0);
  pointer-events: auto;
  visibility: visible;
}

.mobile-nav__backdrop {
  position: fixed;
  inset: 0;
  background-color: rgb(15 23 42 / 50%);
  z-index: 1040;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--dur-fast) var(--ease),
    visibility var(--dur-fast) var(--ease);
}

.mobile-nav__backdrop.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__link {
  display: block;
  padding: 14px 0;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--c-night);
  text-decoration: none;
  border-bottom: 1px solid var(--c-border);
  transition: color var(--dur-fast) var(--ease);
}

.mobile-nav__link:hover {
  color: var(--c-primary);
}

.mobile-nav__link.active {
  color: var(--c-primary);
  font-weight: 700;
  border-left: 3px solid var(--c-primary);
  padding-left: calc(var(--gap-lg) - 3px);
}

.mobile-nav__sublink {
  display: block;
  padding: 10px 0 10px 20px;
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--c-steel);
  text-decoration: none;
  border-bottom: 1px solid var(--c-border);
  transition: color var(--dur-fast) var(--ease);
}

.mobile-nav__sublink:hover {
  color: var(--c-primary);
}

.mobile-nav__sublink.active {
  color: var(--c-primary);
  font-weight: 600;
  border-left: 3px solid var(--c-primary);
  padding-left: 17px;
}

.mobile-nav__cta {
  margin-top: var(--gap-lg);
}

/* ---- Section héro ---- */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--gap-2xl) var(--gap-lg);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgb(15 23 42 / 85%) 0%,
    rgb(30 58 95 / 70%) 50%,
    rgb(74 157 132 / 35%) 100%
  );
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  color: var(--c-white);
}

.hero__content h1 {
  color: var(--c-white);
  margin-bottom: var(--gap-md);
}

.hero__content p {
  font-size: 1.25rem;
  line-height: 1.6;
  color: rgb(255 255 255 / 85%);
  margin-bottom: var(--gap-lg);
  max-width: 60ch;
  margin-left: auto;
  margin-right: auto;
}

.hero__actions {
  display: flex;
  gap: var(--gap-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Secondary button overrides on dark hero backgrounds */
.hero .btn-secondary,
.page-hero .btn-secondary {
  color: var(--c-white);
  border-color: rgb(255 255 255 / 60%);
  box-shadow: none;
}

.hero .btn-secondary:hover,
.page-hero .btn-secondary:hover {
  background-color: rgb(255 255 255 / 15%);
  border-color: var(--c-white);
  color: var(--c-white);
  box-shadow: none;
}

/* Héro compact (pages intérieures) */
.hero--compact {
  min-height: 40vh;
  min-height: 40dvh;
}

/* ---- Sections ---- */
.section {
  padding: var(--gap-2xl) 0;
}

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

.section--dark {
  background-color: var(--c-night);
  color: var(--c-white);
}

.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--c-white);
}

.section__header {
  text-align: center;
  margin-bottom: var(--gap-xl);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.section__subtitle {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-primary);
  margin-bottom: var(--gap-sm);
}

/* Section subtitle visible on dark backgrounds */
.section--dark .section__subtitle,
.page-hero .section__subtitle {
  color: var(--c-teal);
}

/* ---- Fil d'Ariane (Breadcrumb) ---- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  padding: var(--gap-md) 0;
  font-size: 0.875rem;
  color: var(--c-muted);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: '/';
  margin-right: var(--gap-sm);
  color: var(--c-border);
}

.breadcrumb__link {
  color: var(--c-muted);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

.breadcrumb__link:hover {
  color: var(--c-primary);
}

.breadcrumb__current {
  color: var(--c-text);
  font-weight: 500;
}

/* ---- Grilles utilitaires ---- */
.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: var(--gap-lg);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ---- Pied de page (Footer) ---- */
.footer {
  background-color: var(--c-night);
  color: rgb(255 255 255 / 70%);
  padding-top: var(--gap-2xl);
}

.footer a {
  color: rgb(255 255 255 / 70%);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

.footer a:hover {
  color: var(--c-white);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: var(--gap-xl);
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap-lg);
}

/* Colonne logo et description */
.footer__brand {
  padding-right: var(--gap-lg);
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  margin-bottom: var(--gap-md);
}

.footer__logo img {
  height: 36px;
  width: auto;
}

.footer__logo-text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--c-white);
}

.footer__desc {
  font-size: 0.875rem;
  line-height: 1.7;
  margin-bottom: var(--gap-md);
}

/* Colonnes de liens */
.footer__heading {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--c-white);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--gap-md);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.footer__links a {
  font-size: 0.875rem;
  padding: 2px 0;
}

/* Colonne contact */
.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--gap-sm);
  font-size: 0.875rem;
  margin-bottom: var(--gap-sm);
}

.footer__contact-item a {
  word-break: keep-all;
  white-space: nowrap;
}

.footer__contact-item svg,
.footer__contact-item img {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 3px;
  opacity: 0.7;
}

/* Réseaux sociaux */
.footer__social {
  display: flex;
  gap: var(--gap-md);
  margin-top: var(--gap-md);
}

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: rgb(255 255 255 / 10%);
  transition: background-color var(--dur-fast) var(--ease);
}

.footer__social a:hover {
  background-color: var(--c-teal);
}

.footer__social svg {
  width: 18px;
  height: 18px;
  fill: var(--c-white);
}

/* Barre de copyright */
.footer__bottom {
  border-top: 1px solid rgb(255 255 255 / 10%);
  margin-top: var(--gap-xl);
  padding: var(--gap-lg);
  text-align: center;
  font-size: 0.8125rem;
}

.footer__bottom-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--gap-md);
}

.footer__legal {
  display: flex;
  gap: var(--gap-md);
}

.footer__legal a {
  font-size: 0.8125rem;
}

/* ============================================
   Points de rupture responsive
   480px  — petits mobiles
   768px  — tablettes
   1024px — petits écrans
   1200px — écrans standards
   ============================================ */

/* Tablettes et plus petit (< 1024px) */
@media (width <= 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-lg);
  }

  .footer__brand {
    grid-column: 1 / -1;
    padding-right: 0;
  }
}

/* Mobile (< 768px) */
@media (width <= 768px) {
  .header__inner {
    height: 64px;
  }

  /* Masquer la navigation bureau, afficher le hamburger */
  .nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  /* Grilles : une seule colonne */
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  /* Sections : espacement réduit */
  .section {
    padding: var(--gap-xl) 0;
  }

  /* Héro : hauteur réduite */
  .hero {
    min-height: 80vh;
    min-height: 80dvh;
    padding: var(--gap-xl) var(--gap-md);
  }

  .hero__content p {
    font-size: 1.0625rem;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  /* Footer : une seule colonne */
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--gap-lg);
  }

  .footer__bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer__legal {
    justify-content: center;
  }

  /* Conteneur : marges réduites */
  .container {
    padding-left: var(--gap-md);
    padding-right: var(--gap-md);
  }
}

/* Petits mobiles (< 480px) */
@media (width <= 480px) {
  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.375rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .hero--compact {
    min-height: 30vh;
    min-height: 30dvh;
  }
}

/* Grands écrans (> 1200px) */
@media (width >= 1200px) {
  .container {
    padding-left: var(--gap-xl);
    padding-right: var(--gap-xl);
  }
}