/* ==========================================================================
   Mise en page : grille, en-tête, menu mobile, chapitres, pied de page.
   ========================================================================== */

.wrap { padding-inline: var(--gutter); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--gutter);
}

/* Un chapitre = un champ de couleur plein cadre. */
.chapter {
  position: relative;
  background: var(--bg);
  color: var(--ink);
}
.section { padding-block: var(--section); }
.section-head { margin-bottom: clamp(2.5rem, 1rem + 5vw, 5.5rem); }
.section-head .title-head { max-width: 16ch; }
.section-head p { max-width: 46ch; margin-top: var(--space-3); }

/* ==========================================================================
   En-tête
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-header);
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-inline: var(--gutter);
  color: var(--ink);
  background: transparent;
  transition: transform 420ms var(--ease-out), background-color var(--t-ui) ease, color var(--t-ui) ease;
  view-transition-name: site-header;
}
.site-header.is-solid { background: var(--bg); }
.site-header.is-hidden { transform: translateY(-105%); }
.site-header:focus-within { transform: none; }

/* Logo AMO STUDIO (le symbole « amo » du fichier fourni, en ligne pour suivre la couleur de l'en-tête). */
.logo { display: inline-flex; align-items: center; padding-block: 0.35rem; }
.logo__mark {
  display: block;
  height: clamp(1.75rem, 1.5rem + 0.55vw, 2.1rem);
  width: auto;
  aspect-ratio: 686 / 331;
  fill: currentColor;
}
.logo__drop { transition: fill var(--t-ui) ease; }
/* Au survol, la goutte devient du métal en fusion. */
@media (hover: hover) and (pointer: fine) {
  .logo:hover .logo__drop { fill: var(--incandescent); }
}

.nav { display: flex; align-items: center; gap: clamp(1rem, 0.4rem + 1.6vw, 2.25rem); }
.nav__list { display: flex; gap: clamp(1rem, 0.4rem + 1.6vw, 2.25rem); list-style: none; padding: 0; }
.nav__link {
  position: relative;
  font-size: var(--step-small);
  font-weight: 600;
  padding-block: 0.4rem;
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--t-ui) var(--ease-out);
}
.nav__link[aria-current="page"]::after,
.nav__link[aria-current="true"]::after { transform: scaleX(1); }
@media (hover: hover) and (pointer: fine) {
  .nav__link:hover::after { transform: scaleX(1); transform-origin: left; }
}

.menu-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  min-height: 44px;
  padding-inline: 0.25rem;
  font-weight: 700;
  font-size: var(--step-small);
}
.menu-toggle__bars { position: relative; width: 22px; height: 12px; }
.menu-toggle__bars::before,
.menu-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  background: currentColor;
  transition: transform var(--t-ui) var(--ease-out), top var(--t-ui) var(--ease-out);
}
.menu-toggle__bars::before { top: 0; }
.menu-toggle__bars::after { top: 10px; }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars::before { top: 5px; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle__bars::after { top: 5px; transform: rotate(-45deg); }

@media (max-width: 860px) {
  .nav { display: none; }
  .menu-toggle { display: inline-flex; }
}

/* Menu plein écran (mobile) */
.menu {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-header) - 1);
  display: grid;
  grid-template-rows: 1fr auto;
  padding: calc(var(--header-h) + 1.5rem) var(--gutter) var(--gutter);
  background: var(--acier);
  color: var(--craie);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-ui) var(--ease-out), visibility 0s linear var(--t-ui);
}
.menu.is-open { opacity: 1; visibility: visible; transition: opacity var(--t-ui) var(--ease-out); }
.menu__list { list-style: none; padding: 0; display: grid; align-content: start; gap: 0.35rem; }
.menu__link {
  display: inline-block;
  font-size: clamp(2.6rem, 1rem + 9vw, 4.5rem);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: var(--track-head);
  padding-block: 0.15rem;
}
.menu__foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; color: var(--gris-acier); }
@media (prefers-reduced-motion: no-preference) {
  .menu__item { opacity: 0; transform: translate3d(0, 1.4rem, 0); transition: opacity 500ms var(--ease-out), transform 600ms var(--ease-out); transition-delay: calc(var(--i) * 60ms + 80ms); }
  .menu.is-open .menu__item { opacity: 1; transform: none; }
}
html.menu-open { overflow: hidden; }

/* ==========================================================================
   Pied de page : les colonnes en haut, le nom sur toute la largeur en bas.
   ========================================================================== */
.site-footer {
  --bg: var(--acier);
  --ink: var(--craie);
  --muted: var(--gris-acier);
  position: relative;
  container-type: inline-size;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto 1fr auto;
  min-height: min(100svh, 56rem);
  padding: clamp(2.5rem, 1.5rem + 3vw, 4rem) var(--gutter) var(--gutter);
  background: var(--bg);
  color: var(--ink);
  overflow: hidden;
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4) var(--gutter);
  font-size: var(--step-small);
}
.footer-cols h2 { font-size: var(--step-small); font-weight: 700; letter-spacing: 0; margin-bottom: 0.75rem; }
.footer-cols ul { list-style: none; padding: 0; display: grid; gap: 0.45rem; color: var(--muted); }
.footer-cols a { color: var(--ink); }
.footer-cols p { color: var(--muted); }
.footer-cols p + p { margin-top: 0.45rem; }

.footer-mark {
  display: block;
  width: 100%;
  margin-top: clamp(3rem, 2rem + 6vw, 8rem);
  font-weight: 800;
  /* « AMO STUDIO » mesure 6,16 em : la ligne occupe exactement la largeur du pied de page. */
  font-size: calc(100cqi / 6.2);
  line-height: 0.8;
  letter-spacing: -0.06em;
  white-space: nowrap;
  color: var(--craie);
  user-select: none;
}
.footer-mark .ch { display: inline-block; font-variation-settings: "wght" var(--wght, 800); transition: color 600ms var(--ease-soft); }
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  margin-top: 1.25rem;
  font-size: var(--step-small);
  color: var(--muted);
}

@media (max-width: 860px) {
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}