/* Accueil simple (28/10/2026) : Karim et un élève trouvaient l'entrée « pas claire ». Mode jour par défaut, mode nuit au choix.
   La planète et le film sont sur /visite.html (« Visite immersive »). */
:root {
  --bg: #e6f0fa; --carte: #f4f8fc; --ink: #10202e; --fort: #030e14; --doux: #3f5566; --mono: #0b4a62; --accent: #8a3701;
  --marque: #c8641f; --bouton: #e07a3a; --bouton-texte: #071523; --filet: rgba(7, 21, 35, 0.14); --entete: rgba(230, 240, 250, 0.92);
  --ombre: 0 18px 40px -24px rgba(7, 21, 35, 0.35);
  color-scheme: light;
}
html[data-mode="nuit"] {
  --bg: #071523; --carte: #0b1d2e; --ink: #eaf5fb; --fort: #ffffff; --doux: #9fbfd0; --mono: #a0d5e9; --accent: #ffb37a;
  --marque: #e07a3a; --bouton: #ffb37a; --bouton-texte: #071523; --filet: rgba(165, 217, 237, 0.22); --entete: rgba(7, 21, 35, 0.9);
  --ombre: 0 24px 50px -24px rgba(0, 0, 0, 0.7);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 17px/1.6 Manrope, Arial, sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img { display: block; max-width: 100%; }
.mono { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--mono); margin: 0; }
.large { width: min(1180px, 100% - 40px); margin-inline: auto; }
.lien-evitement { position: absolute; left: -9999px; }
.lien-evitement:focus { left: 16px; top: 12px; z-index: 50; background: var(--bouton); color: var(--bouton-texte); padding: 8px 14px; }

/* En-tête */
.entete { position: sticky; top: 0; z-index: 20; background: var(--entete); backdrop-filter: blur(10px); border-bottom: 1px solid var(--filet); }
.entete .large { display: flex; align-items: center; gap: 12px 28px; min-height: 68px; flex-wrap: wrap; padding-block: 10px; }
.marque { font-weight: 700; font-size: 22px; letter-spacing: -0.04em; text-decoration: none; color: var(--fort); }
.marque span { color: var(--marque); }
.nav { display: flex; gap: 6px 24px; flex-wrap: wrap; margin-left: auto; font-size: 15px; }
.nav a { text-decoration: none; color: var(--doux); }
.nav a:hover { color: var(--fort); }
.mode { width: 38px; height: 38px; display: inline-grid; place-items: center; border: 1px solid var(--filet); background: transparent; color: var(--doux); cursor: pointer; }
.mode:hover { color: var(--fort); }
.mode svg { width: 17px; height: 17px; }
@media (max-width: 640px) {
  .nav { order: 3; width: 100%; margin-left: 0; }
  .mode { margin-left: auto; }
}

/* Haut de page */
.haut { padding: clamp(48px, 9vw, 110px) 0 clamp(40px, 6vw, 72px); }
.haut h1 { font-weight: 400; letter-spacing: -0.05em; line-height: 1.02; font-size: clamp(42px, 7.4vw, 92px); color: var(--fort); margin: 22px 0 0; max-width: 14ch; }
.haut h1 em { font-style: normal; color: var(--accent); }
.haut .chapeau { max-width: 620px; font-size: clamp(18px, 2vw, 21px); color: var(--doux); margin: 22px 0 0; }
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.bouton { display: inline-flex; align-items: center; gap: 10px; min-height: 52px; padding: 0 24px; font: 600 16px/1 Manrope, Arial, sans-serif; text-decoration: none; border: 1px solid transparent; cursor: pointer; transition: transform 160ms cubic-bezier(0.23, 1, 0.32, 1), filter 150ms; }
.bouton:active { transform: scale(0.97); }
.bouton.plein { background: var(--bouton); color: var(--bouton-texte); }
.bouton.plein:hover { filter: brightness(1.06); }
.bouton.creux { border-color: var(--filet); color: var(--fort); background: transparent; }
.bouton.creux:hover { border-color: var(--doux); }
.bouton svg { width: 18px; height: 18px; }

/* Parties */
.partie { border-top: 1px solid var(--filet); padding: clamp(40px, 6vw, 72px) 0; }
.partie h2 { font-weight: 400; letter-spacing: -0.04em; line-height: 1.1; font-size: clamp(30px, 4.2vw, 46px); color: var(--fort); margin: 12px 0 0; }
.partie .intro { max-width: 640px; color: var(--doux); margin: 12px 0 0; }

/* Outils */
.outils { list-style: none; margin: 36px 0 0; padding: 0; display: grid; gap: 22px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.outil { background: var(--carte); border: 1px solid var(--filet); display: flex; flex-direction: column; }
.outil .vignette { position: relative; aspect-ratio: 16 / 10; overflow: hidden; border-bottom: 1px solid var(--filet); background: #0b1d2e; padding: 0; border-top: 0; border-left: 0; border-right: 0; cursor: pointer; width: 100%; }
.outil .vignette img { width: 100%; height: 100%; object-fit: cover; object-position: top center; transition: transform 300ms cubic-bezier(0.23, 1, 0.32, 1); }
.outil .vignette:hover img { transform: scale(1.03); }
.outil .lecture { position: absolute; left: 14px; bottom: 14px; display: inline-flex; align-items: center; gap: 8px; background: rgba(7, 21, 35, 0.86); color: #fff; font: 600 13px/1 Manrope, Arial, sans-serif; padding: 9px 12px; }
.outil .lecture svg { width: 14px; height: 14px; fill: #ffb37a; }
.outil .corps { padding: 18px 18px 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.outil h3 { margin: 4px 0 0; font-weight: 500; font-size: 21px; letter-spacing: -0.03em; color: var(--fort); }
.outil p { margin: 0; color: var(--doux); font-size: 15px; line-height: 1.5; }
.outil .liens { margin-top: auto; padding-top: 10px; display: flex; gap: 18px; flex-wrap: wrap; font-size: 15px; font-weight: 600; }
.outil .liens a, .outil .liens button { color: var(--accent); text-decoration: none; background: none; border: 0; padding: 0; font: inherit; cursor: pointer; }
.outil .liens a:hover, .outil .liens button:hover { text-decoration: underline; text-underline-offset: 3px; }
.suite { margin-top: 30px; }
.suite a { color: var(--fort); font-weight: 600; text-underline-offset: 4px; }

/* Trois portes */
.portes { list-style: none; margin: 32px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); border-top: 1px solid var(--filet); border-left: 1px solid var(--filet); }
.portes li { border-right: 1px solid var(--filet); border-bottom: 1px solid var(--filet); }
.portes a { display: block; padding: 26px 24px 28px; text-decoration: none; height: 100%; }
.portes a:hover { background: var(--carte); }
.portes b { display: block; margin-top: 14px; font-weight: 500; font-size: 22px; letter-spacing: -0.03em; color: var(--fort); }
.portes span:not(.mono) { display: block; margin-top: 6px; color: var(--doux); font-size: 15px; }

/* Vidéo */
.video { border: 0; padding: 0; background: transparent; width: min(980px, 100% - 24px); max-width: none; }
.video::backdrop { background: rgba(4, 12, 22, 0.82); }
.video .cadre { position: relative; aspect-ratio: 16 / 9; background: #000; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video .fermer { display: block; margin: 0 0 10px auto; background: rgba(7, 21, 35, 0.6); border: 1px solid rgba(255, 255, 255, 0.4); color: #fff; font: 600 14px/1 Manrope, Arial, sans-serif; padding: 10px 14px; cursor: pointer; }
.video .titre { color: #fff; margin: 12px 0 0; font-size: 15px; }

/* Pied */
.pied { border-top: 1px solid var(--filet); padding: 34px 0 40px; font-size: 14px; color: var(--doux); }
.pied .large { display: grid; gap: 16px; }
.pied nav { display: flex; flex-wrap: wrap; gap: 6px 22px; }
.pied a { text-decoration: none; }
.pied a:hover { color: var(--fort); }
.pied .protection { font-size: 12px; }

/* Image de la visite immersive, à droite du titre */
@media (min-width: 960px) { .haut { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 56px; align-items: center; } }
.porte-visite { display: block; text-decoration: none; border: 1px solid var(--filet); background: var(--carte); margin-top: 40px; }
@media (min-width: 960px) { .porte-visite { margin-top: 0; } }
.porte-visite img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; transition: transform 300ms cubic-bezier(0.23, 1, 0.32, 1); }
.porte-visite { overflow: hidden; }
.porte-visite > span { display: block; padding: 16px 18px 18px; }
.porte-visite b { display: block; margin-top: 6px; font-weight: 500; font-size: 20px; letter-spacing: -0.03em; color: var(--fort); }
@media (hover: hover) { .porte-visite:hover img { transform: scale(1.03); } }
@media (max-width: 959px) { .porte-visite { display: none; } }