/* ==========================================================================
   layout.css — Conteneurs, grille, en-tête, pied de page, navigation
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section { padding-block: var(--space-9); }
.section--alt { background: var(--color-surface-alt); }
.section--dark {
  background: var(--gradient-dark);
  color: var(--color-white);
}
.section--dark h2, .section--dark h3 { color: #fff; }
.section--dark p { color: rgba(255,255,255,.72); }

/* ---- En-tête / barre de navigation ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(255,255,255,.8);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-line);
  transition: box-shadow var(--t-base);
}
.site-header.is-scrolled { box-shadow: var(--shadow-md); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-lg);
  letter-spacing: -0.03em;
}
.nav__logo-img {
  height: 30px;
  width: auto;
  display: block;
}
.nav__brand b { color: var(--color-primary); }

/* Logo complet (version blanche) dans le pied de page */
.footer__logo {
  height: 46px;
  width: auto;
  display: block;
  margin-bottom: var(--space-2);
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.nav__link {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-slate);
  position: relative;
  padding-block: var(--space-2);
  transition: color var(--t-fast);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 2px;
  background: var(--gradient-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base);
}
.nav__link:hover { color: var(--color-ink); }
.nav__link:hover::after,
.nav__link.is-active::after { transform: scaleX(1); }
.nav__link.is-active { color: var(--color-ink); }

.nav__toggle {
  display: none;
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.nav__toggle span {
  width: 22px; height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform var(--t-base), opacity var(--t-fast);
}
.nav__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.is-open span:nth-child(2) { opacity: 0; }
.nav__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Pied de page ---- */
.site-footer {
  background: var(--color-ink);
  color: rgba(255,255,255,.7);
  padding-block: var(--space-8) var(--space-6);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-7);
}
.footer__col h4 {
  color: #fff;
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: var(--space-4);
}
.footer__col a {
  display: block;
  padding-block: var(--space-1);
  color: rgba(255,255,255,.62);
  font-size: var(--fs-sm);
  transition: color var(--t-fast);
}
.footer__col a:hover { color: var(--color-accent-light); }
.footer__brand p { color: rgba(255,255,255,.55); font-size: var(--fs-sm); max-width: 30ch; }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: var(--space-5);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: var(--fs-xs);
  color: rgba(255,255,255,.5);
}
.footer__socials { display: flex; gap: var(--space-3); }
.footer__socials a {
  width: 38px; height: 38px;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius-full);
  display: grid; place-items: center;
  transition: background var(--t-base), border-color var(--t-base);
}
.footer__socials a:hover { background: var(--color-primary); border-color: var(--color-primary); }

/* ---- Grilles utilitaires ---- */
.grid { display: grid; gap: var(--space-6); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }

  .nav__toggle { display: flex; }
  .nav__menu {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-line);
    padding: var(--space-4) var(--space-5) var(--space-6);
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%);
    transition: transform var(--t-base);
  }
  .nav__menu.is-open { transform: translateY(0); }
  .nav__menu .nav__link { padding-block: var(--space-4); border-bottom: 1px solid var(--color-line); }
  .nav__menu .btn { margin-top: var(--space-4); }
}

@media (max-width: 600px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .section { padding-block: var(--space-8); }
}