/* =========================================================================
   NOVA · Mise en page : couches fixes, en-tête, menu, HUD, pied de page
   ========================================================================= */

/* --- Couches fixes : scène, vignette, flash ----------------------------- */
#scene {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  display: block;
  opacity: 0;
  transition: opacity 1600ms var(--ease-out);
}

#scene.is-ready { opacity: 1; }

.vignette {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 45%, rgb(3 5 12 / .75) 100%);
}

.flash {
  position: fixed;
  inset: 0;
  z-index: 40;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(circle at var(--fx, 50%) var(--fy, 50%), #fff 0%, #b9e6ff 22%, rgb(85 199 255 / .75) 45%, rgb(49 87 213 / .55) 70%, rgb(5 8 19 / .2) 100%);
}

main, .site-footer { position: relative; z-index: 2; }

.section { padding-block: var(--section-space); }

.section-head {
  display: grid;
  gap: 1.25rem;
  margin-bottom: clamp(3rem, 6vw, 5rem);
}

/* --- En-tête ------------------------------------------------------------ */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 60;
  padding-top: env(safe-area-inset-top, 0px);
  transition: background-color var(--dur-slow) ease, transform var(--dur-slow) var(--ease-out);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(rgb(5 8 19 / .9), rgb(5 8 19 / 0));
  pointer-events: none;
}

.site-header[data-scrolled]::before {
  background: rgb(5 8 19 / .88);
  border-bottom: 1px solid var(--line);
}

.site-header[data-hidden] { transform: translateY(-100%); }

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-block: 1.1rem;
  padding-left: max(1.5rem, env(safe-area-inset-left, 0px));
  padding-right: max(1.5rem, env(safe-area-inset-right, 0px));
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text);
  text-decoration: none;
}

.logo-mark {
  width: 1.1rem;
  height: 1.1rem;
  fill: var(--accent);
  filter: drop-shadow(0 0 6px rgb(85 199 255 / .8));
  transition: transform 600ms var(--ease-in-out);
}

.nav { margin-left: auto; }

.nav-list {
  display: flex;
  gap: 1.6rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  position: relative;
  padding-block: .3rem;
  color: var(--text);
  text-decoration: none;
  font-size: .95rem;
  opacity: .72;
  transition: opacity var(--dur-base) ease;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 300ms var(--ease-out);
}

.nav-list a[aria-current="true"] { opacity: 1; }
.nav-list a[aria-current="true"]::after,
.nav-list a:focus-visible::after { transform: scaleX(1); }

/* Lien de changement de langue */
.lang-switch {
  display: inline-grid;
  place-items: center;
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--text);
  text-decoration: none;
  transition: border-color var(--dur-base) ease;
}

.lang-switch:hover { border-color: var(--accent); }

.menu-toggle {
  display: none;
  position: relative;
  width: 48px;
  height: 48px;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgb(255 255 255 / .04);
  cursor: pointer;
}

.menu-toggle-bar {
  position: absolute;
  left: 14px;
  right: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform 300ms var(--ease-out);
}

.menu-toggle-bar:nth-of-type(2) { transform: translateY(-4px); }
.menu-toggle-bar:nth-of-type(3) { transform: translateY(4px); }
.menu-toggle[aria-expanded="true"] .menu-toggle-bar:nth-of-type(2) { transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-toggle-bar:nth-of-type(3) { transform: rotate(-45deg); }

/* --- Menu plein écran --------------------------------------------------- */
.menu {
  position: fixed;
  inset: 0;
  z-index: 55;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2.5rem;
  padding: 7rem max(1.5rem, env(safe-area-inset-right, 0px)) 3rem max(1.5rem, env(safe-area-inset-left, 0px));
  background: rgb(5 8 19 / .97);
}

.menu-list {
  display: grid;
  gap: .4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu-list a {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 9vw, 3rem);
  line-height: 1.2;
  color: var(--text);
  text-decoration: none;
}

.menu-foot { font-family: var(--font-mono); color: var(--muted); font-size: .9rem; }

/* --- HUD et barre de progression ---------------------------------------- */
/* HUD vertical le long du bord gauche, affiché seulement quand la marge le permet */
.hud {
  position: fixed;
  left: max(1.4rem, env(safe-area-inset-left, 0px));
  bottom: calc(2rem + env(safe-area-inset-bottom, 0px));
  z-index: 50;
  display: none;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  gap: 1.5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  pointer-events: none;
}

.hud-num, .hud-value { color: var(--text); }

.progress {
  position: fixed;
  right: max(1.25rem, env(safe-area-inset-right, 0px));
  top: 50%;
  z-index: 50;
  width: 2px;
  height: 28vh;
  translate: 0 -50%;
  border-radius: 2px;
  background: var(--line);
  overflow: hidden;
  pointer-events: none;
}

.progress-fill {
  position: absolute;
  inset: 0;
  background: linear-gradient(var(--accent), var(--primary-bright));
  transform: scaleY(0);
  transform-origin: top;
}

/* --- Pied de page ------------------------------------------------------- */
.site-footer {
  padding-block: 4rem calc(2rem + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line);
  background: rgb(5 8 19 / .9);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 2.5rem;
}

.footer-brand { display: grid; gap: 1rem; align-content: start; max-width: 30ch; }

.footer-col ul {
  display: grid;
  gap: .6rem;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--muted);
}

.footer-col a { color: var(--muted); text-decoration: none; transition: color var(--dur-base) ease; }
.footer-col a:hover { color: var(--text); }

.footer-title {
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: var(--fs-small);
}

.to-top { color: var(--muted); text-decoration: none; }
.to-top:hover { color: var(--text); }

/* --- Responsive --------------------------------------------------------- */
@media (max-width: 1080px) {
  .site-header .nav, .site-header .header-cta { display: none; }
  .lang-switch { margin-left: auto; }
  .menu-toggle { display: block; margin-left: 0; }
}

@media (min-width: 1360px) {
  .hud { display: flex; }
}

@media (max-width: 760px) {
  .progress { right: .5rem; height: 20vh; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}