/* Ouverture cinématique (bouclier qui s'allume, onde de balayage, titre) + transitions entre écrans.
   --k règle la durée : 1 = complète (~2,7 s), 0,4 = courte (mode léger). Mouvement réduit : pas d'ouverture du tout. */

.ouverture {
  --k: 1;
  position: fixed; inset: 0; z-index: 100; overflow: hidden;
  display: grid; place-items: center;
  background: radial-gradient(60% 50% at 50% 45%, #0A1A1A, var(--fond) 70%);
  /* filet de sécurité : si le script ne démarre pas, l'ouverture s'efface seule */
  animation: ouv-secours 0.4s 7s forwards;
}
.ouverture[data-type="courte"] { --k: 0.4; }
@keyframes ouv-secours { to { opacity: 0; visibility: hidden; } }
.ouverture > * { opacity: 0; }
.ouverture.joue > * { opacity: 1; }

.ouv-grille {
  position: absolute; left: -50%; right: -50%; bottom: -5%; height: 65%;
  background-image: linear-gradient(rgba(60, 245, 176, 0.22) 1px, transparent 1px), linear-gradient(90deg, rgba(60, 245, 176, 0.22) 1px, transparent 1px);
  background-size: 46px 46px;
  transform: perspective(360px) rotateX(64deg); transform-origin: 50% 100%;
  -webkit-mask-image: linear-gradient(to top, #000, transparent 80%); mask-image: linear-gradient(to top, #000, transparent 80%);
}
.joue .ouv-grille { animation: ouv-grille calc(var(--k) * 1.2s) var(--sortie) both; }
@keyframes ouv-grille { from { opacity: 0; transform: perspective(360px) rotateX(64deg) translateY(30%); } }

.ouv-centre { position: relative; text-align: center; }
.ouv-bouclier { width: min(44vw, 190px); overflow: visible; display: block; margin: 0 auto; }
.ouv-contour, .ouv-interieur, .ouv-coche { stroke-dasharray: 100; stroke-dashoffset: 100; }
.joue .ouv-contour { animation: ouv-trait calc(var(--k) * 0.8s) cubic-bezier(.6, .1, .2, 1) calc(var(--k) * 0.15s) forwards; filter: drop-shadow(0 0 6px rgba(60, 245, 176, 0.9)); }
.joue .ouv-interieur { animation: ouv-trait calc(var(--k) * 0.6s) ease-out calc(var(--k) * 0.55s) forwards; }
.joue .ouv-coche { animation: ouv-trait calc(var(--k) * 0.35s) cubic-bezier(.6, 0, .3, 1.4) calc(var(--k) * 1.05s) forwards; }
@keyframes ouv-trait { to { stroke-dashoffset: 0; } }
.ouv-remplissage { opacity: 0; }
.joue .ouv-remplissage { animation: ouv-remplir calc(var(--k) * 0.7s) ease-out calc(var(--k) * 0.9s) forwards; }
@keyframes ouv-remplir { 0% { opacity: 0; } 30% { opacity: 0.45; } 100% { opacity: 0.12; } }
.ouv-lueur { opacity: 0; transform-origin: 100px 104px; }
.joue .ouv-lueur { animation: ouv-allumage calc(var(--k) * 0.9s) var(--sortie) calc(var(--k) * 0.9s) forwards; }
@keyframes ouv-allumage { 0% { opacity: 0; transform: scale(0.4); } 35% { opacity: 1; transform: scale(1.25); } 100% { opacity: 0.75; transform: scale(1); } }
.ouv-orbite { opacity: 0; transform-origin: 100px 106px; }
.joue .ouv-orbite { animation: ouv-apparait 0.6s ease calc(var(--k) * 1.2s) forwards, tourner 14s linear infinite; }
@keyframes ouv-apparait { to { opacity: 1; } }

/* onde de balayage qui part du bouclier et traverse l'écran */
.ouv-onde { position: absolute; left: 50%; top: 50%; width: 140px; height: 140px; margin: -90px 0 0 -70px; border-radius: 50%; border: 2px solid rgba(60, 245, 176, 0.8); box-shadow: 0 0 40px rgba(60, 245, 176, 0.5), inset 0 0 30px rgba(60, 245, 176, 0.3); transform: scale(0); }
.joue .ouv-onde { animation: ouv-onde calc(var(--k) * 1.3s) cubic-bezier(.1, .6, .3, 1) calc(var(--k) * 1s) both; }
.joue .ouv-onde-2 { animation-delay: calc(var(--k) * 1.25s); border-color: rgba(56, 217, 245, 0.6); }
@keyframes ouv-onde { 0% { transform: scale(0.2); opacity: 1; } 100% { transform: scale(9); opacity: 0; } }
.ouv-balayage { position: absolute; left: 0; right: 0; top: 0; height: 120px; background: linear-gradient(to bottom, transparent, rgba(60, 245, 176, 0.16) 70%, rgba(150, 255, 220, 0.6) 98%, transparent); transform: translateY(-130px); }
.joue .ouv-balayage { animation: ouv-balayage calc(var(--k) * 1s) cubic-bezier(.5, 0, .5, 1) calc(var(--k) * 1.1s) both; }
@keyframes ouv-balayage { to { transform: translateY(110vh); } }

.ouv-titre { margin: 22px 0 4px; font-size: clamp(30px, 10vw, 46px); font-weight: 700; color: #F2FFFA; text-shadow: 0 0 24px rgba(60, 245, 176, 0.6); letter-spacing: 0.3em; padding-left: 0.3em; }
.joue .ouv-titre { animation: ouv-titre calc(var(--k) * 0.9s) var(--sortie) calc(var(--k) * 1.25s) both; }
@keyframes ouv-titre { from { opacity: 0; letter-spacing: 0.8em; padding-left: 0.8em; filter: blur(8px); } }
.ouv-sous { margin: 0; font-family: var(--mono); font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--cyan); }
.joue .ouv-sous { animation: ouv-monter calc(var(--k) * 0.6s) var(--sortie) calc(var(--k) * 1.6s) both; }
@keyframes ouv-monter { from { opacity: 0; transform: translateY(8px); } }
.ouv-progression { width: 140px; height: 2px; margin: 20px auto 0; border-radius: 2px; background: rgba(255, 255, 255, 0.1); overflow: hidden; }
.ouv-progression span { display: block; height: 100%; background: linear-gradient(90deg, var(--vert), var(--cyan)); transform-origin: 0 50%; transform: scaleX(0); }
.joue .ouv-progression span { animation: ouv-progression calc(var(--k) * 2.5s) cubic-bezier(.4, 0, .2, 1) 0.1s forwards; }
@keyframes ouv-progression { to { transform: scaleX(1); } }

/* sortie : on traverse le bouclier (zoom + fondu) et l'accueil apparaît derrière */
.ouverture.sortie { animation: ouv-sortie calc(var(--k) * 0.9s) cubic-bezier(.6, 0, .2, 1) forwards; pointer-events: none; }
.ouverture.sortie .ouv-centre { animation: ouv-traverser calc(var(--k) * 0.9s) cubic-bezier(.6, 0, .2, 1) forwards; }
@keyframes ouv-sortie { 60% { opacity: 1; } to { opacity: 0; visibility: hidden; } }
@keyframes ouv-traverser { to { transform: scale(2.6); opacity: 0; filter: blur(6px); } }
html:not(.intro) #app { animation: app-revele 0.9s var(--sortie) both; }
@keyframes app-revele { from { transform: scale(0.94); opacity: 0.2; } }

html[data-mouvement="reduit"] .ouverture { display: none; }
@media (prefers-reduced-motion: reduce) { .ouverture { display: none; } html:not(.intro) #app { animation: none; } }

/* ——— Transitions entre écrans (View Transitions API) ——— */
#app { view-transition-name: ecran; }
::view-transition-old(root), ::view-transition-new(root) { animation: none; }
::view-transition-group(ecran) { animation-duration: 0.46s; }
::view-transition-old(ecran), ::view-transition-new(ecran) { animation-duration: 0.46s; animation-timing-function: cubic-bezier(.2, .8, .2, 1); animation-fill-mode: both; height: auto; }
html[data-sens="avant"]::view-transition-old(ecran) { animation-name: vt-reculer; }
html[data-sens="avant"]::view-transition-new(ecran) { animation-name: vt-surgir; }
html[data-sens="arriere"]::view-transition-old(ecran) { animation-name: vt-partir-vers-toi; }
html[data-sens="arriere"]::view-transition-new(ecran) { animation-name: vt-revenir; }
html[data-sens="droite"]::view-transition-old(ecran) { animation-name: vt-sortir-gauche; }
html[data-sens="droite"]::view-transition-new(ecran) { animation-name: vt-entrer-droite; }
html[data-sens="gauche"]::view-transition-old(ecran) { animation-name: vt-sortir-droite; }
html[data-sens="gauche"]::view-transition-new(ecran) { animation-name: vt-entrer-gauche; }
/* profondeur : l'ancien écran s'enfonce, le nouveau arrive de devant */
@keyframes vt-reculer { to { opacity: 0; transform: scale(0.9) translateY(10px); filter: brightness(0.5); } }
@keyframes vt-surgir { from { opacity: 0; transform: scale(1.08); } }
@keyframes vt-partir-vers-toi { to { opacity: 0; transform: scale(1.08); } }
@keyframes vt-revenir { from { opacity: 0; transform: scale(0.92); filter: brightness(0.5); } }
@keyframes vt-sortir-gauche { to { opacity: 0; transform: translateX(-18%) scale(0.96); } }
@keyframes vt-entrer-droite { from { opacity: 0; transform: translateX(18%) scale(0.96); } }
@keyframes vt-sortir-droite { to { opacity: 0; transform: translateX(18%) scale(0.96); } }
@keyframes vt-entrer-gauche { from { opacity: 0; transform: translateX(-18%) scale(0.96); } }

/* repli sans View Transitions : animation d'entrée seule */
#app.entree { animation: vt-surgir 0.42s var(--sortie) both; }
html[data-sens="arriere"] #app.entree { animation-name: vt-revenir; }
html[data-sens="droite"] #app.entree { animation-name: vt-entrer-droite; }
html[data-sens="gauche"] #app.entree { animation-name: vt-entrer-gauche; }

html[data-mouvement="reduit"]::view-transition-group(*),
html[data-mouvement="reduit"]::view-transition-old(*),
html[data-mouvement="reduit"]::view-transition-new(*) { animation: none !important; }
@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
}