@font-face {
  font-family: "Montserrat";
  font-style: normal;
  font-weight: 300;
  font-display: swap;
  src: url("fonts/montserrat-latin-300-normal.woff2") format("woff2");
}
@font-face {
  font-family: "Montserrat";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/montserrat-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "Montserrat";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("fonts/montserrat-latin-500-normal.woff2") format("woff2");
}

:root {
  --night: #050b18;
  --ice: #cfe2fb;
  --ice-soft: rgba(207, 226, 251, .74);
  --ice-faint: rgba(207, 226, 251, .45);
  --glow: #6fb3ff;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: "Montserrat", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ice);
  background: var(--night);
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 24px 16px calc(24px + env(safe-area-inset-bottom));
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
/* Ambiance : le wallpaper flouté remplit tout l'écran derrière l'image nette */
body::before {
  content: "";
  position: fixed;
  inset: -40px;
  background: url("wallpaper.jpg") center / cover no-repeat;
  filter: blur(36px) saturate(1.1);
  opacity: .45;
  z-index: 0;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at 50% 40%, rgba(5,11,24,.15) 0%, rgba(5,11,24,.85) 75%);
  z-index: 0;
}
.hero {
  position: relative;
  z-index: 1;
  width: 100%;
  display: flex;
  justify-content: center;
  overflow: hidden;
}
.frame {
  position: relative;
  display: block;
  flex: none; /* garde la largeur de l'image : sur mobile elle déborde et doit rester centrée */
  overflow: hidden;
  /* Bords fondus pour que l'image se fonde dans la nuit */
  -webkit-mask-image:
    linear-gradient(90deg, transparent 0%, #000 12%, #000 88%, transparent 100%),
    linear-gradient(180deg, transparent 0%, #000 10%, #000 82%, transparent 100%);
  -webkit-mask-composite: source-in;
  mask-image:
    linear-gradient(90deg, transparent 0%, #000 12%, #000 88%, transparent 100%),
    linear-gradient(180deg, transparent 0%, #000 10%, #000 82%, transparent 100%);
  mask-composite: intersect;
  animation: fade 1.6s ease-out both;
}
.hero picture { display: block; }
.hero img {
  display: block;
  height: min(70vh, 56.25vw);   /* ratio 16:9 */
  width: auto;
  max-width: none;
}

/* Aurores animées — CSS seulement (la CSP interdit les scripts).
   Les masques restent fixes et tiennent le logo et les montagnes à l'écart ;
   seul le contenu à l'intérieur bouge (transform/opacity = composité GPU). */
.sky, .veil, .mist {
  position: absolute;
  inset: 0;
  pointer-events: none;
  mix-blend-mode: screen;
  overflow: hidden;
}
.sky i, .veil i, .mist i {
  position: absolute;
  inset: 0;
  will-change: transform, opacity;
}
/* 1. Rideaux : copie de l'image qui ondule et respire au-dessus de l'originale */
.sky i {
  background: url("wallpaper.webp") 0 0 / 100% 100% no-repeat;
  filter: brightness(.95) contrast(1.7) saturate(1.2);
}
.sky.l {
  -webkit-mask-image: radial-gradient(ellipse 17% 31% at 19% 37%, #000 35%, transparent 100%);
  mask-image: radial-gradient(ellipse 17% 31% at 19% 37%, #000 35%, transparent 100%);
}
.sky.r {
  -webkit-mask-image: radial-gradient(ellipse 13% 27% at 82% 43%, #000 35%, transparent 100%);
  mask-image: radial-gradient(ellipse 13% 27% at 82% 43%, #000 35%, transparent 100%);
}
.sky.l i { transform-origin: 19% 72%; animation: curtain-l 17s ease-in-out infinite; }
.sky.r i { transform-origin: 82% 72%; animation: curtain-r 21s ease-in-out -7s infinite; }

/* 2. Voile : rayons lumineux flous qui dérivent lentement dans les deux zones */
.veil {
  opacity: .5;
  -webkit-mask-image:
    radial-gradient(ellipse 19% 34% at 18% 36%, #000 20%, transparent 100%),
    radial-gradient(ellipse 15% 30% at 82% 42%, #000 20%, transparent 100%);
  mask-image:
    radial-gradient(ellipse 19% 34% at 18% 36%, #000 20%, transparent 100%),
    radial-gradient(ellipse 15% 30% at 82% 42%, #000 20%, transparent 100%);
}
.veil i {
  inset: -10% -30%;
  background:
    repeating-linear-gradient(97deg, transparent 0 2.6%, rgba(111,179,255,.30) 3.6%, transparent 5%),
    repeating-linear-gradient(83deg, transparent 0 4.1%, rgba(140,215,255,.22) 5.2%, transparent 6.8%);
  filter: blur(10px);
  animation: drift 34s ease-in-out infinite alternate, breathe 11s ease-in-out infinite alternate;
}

/* 3. Brume : nappes douces qui glissent au ras des montagnes, sur les côtés */
.mist i {
  inset: 0 -12%;
  background:
    radial-gradient(ellipse 16% 7% at 14% 64%, rgba(150,185,230,.20), transparent 70%),
    radial-gradient(ellipse 12% 5% at 30% 70%, rgba(150,185,230,.12), transparent 70%),
    radial-gradient(ellipse 14% 6% at 86% 68%, rgba(150,185,230,.16), transparent 70%);
  filter: blur(6px);
  animation: mist 46s ease-in-out infinite alternate;
}

@keyframes curtain-l {
  0%, 100% { transform: translateX(0) skewX(0) scaleY(1); opacity: .25; }
  30%      { transform: translateX(1.1%) skewX(-3deg) scaleY(1.05); opacity: .6; }
  62%      { transform: translateX(-.7%) skewX(2deg) scaleY(.98); opacity: .35; }
}
@keyframes curtain-r {
  0%, 100% { transform: translateX(0) skewX(0) scaleY(1); opacity: .3; }
  38%      { transform: translateX(-1%) skewX(2.6deg) scaleY(1.04); opacity: .55; }
  70%      { transform: translateX(.6%) skewX(-1.8deg) scaleY(.99); opacity: .22; }
}
@keyframes drift {
  from { transform: translateX(-5%); }
  to   { transform: translateX(5%); }
}
@keyframes breathe {
  from { opacity: .45; }
  to   { opacity: 1; }
}
@keyframes mist {
  from { transform: translateX(-3%); opacity: .7; }
  to   { transform: translateX(3%); opacity: 1; }
}
@keyframes glow {
  from { opacity: .36; }
  to   { opacity: .5; }
}
body::before { animation: glow 19s ease-in-out infinite alternate; }
main {
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin-top: clamp(4px, 1vh, 12px);
  animation: rise 1.4s ease-out .5s both;
}
.launch {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(16px, 3vw, 30px);
}
.t {
  font-weight: 300;
  font-size: clamp(16px, 2.4vw, 26px);
  letter-spacing: .32em;
  text-transform: uppercase;
  white-space: nowrap;
  margin-right: -.32em; /* compense l'espacement final pour un vrai centrage */
  text-shadow: 0 0 22px rgba(111,179,255,.35);
}
.t.en { color: var(--ice-soft); }
.sep {
  width: 1px;
  height: 28px;
  background: linear-gradient(180deg, transparent, var(--glow), transparent);
}
.rule {
  width: 64px;
  height: 1px;
  margin: 20px auto 16px;
  background: linear-gradient(90deg, transparent, var(--glow), transparent);
}
.sub {
  font-size: clamp(13px, 1.5vw, 15px);
  line-height: 1.75;
  letter-spacing: .03em;
  color: var(--ice-soft);
}
.sub .en { color: var(--ice-faint); }
footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(28px, 5vh, 52px);
  font-size: 11px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--ice-faint);
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes rise {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .frame, main, body::before { animation: none; }
  .sky, .veil, .mist { display: none; }
}
/* Mobile : image agrandie (montagnes recadrées), logo plus présent, titres empilés */
@media (max-width: 640px) {
  .hero {
    width: 100vw;
    margin: 0 -16px;
    -webkit-mask-image: linear-gradient(90deg, transparent 0%, #000 14%, #000 86%, transparent 100%);
    mask-image: linear-gradient(90deg, transparent 0%, #000 14%, #000 86%, transparent 100%);
  }
  .hero img { height: calc(165vw * .5625); }
  .launch { flex-direction: column; gap: 10px; }
  .sep { display: none; }
}