/* =========================================================
   CEPF Tahiti — Expérience immersive 3D
   Canvas WebGL fixe + sections en panneaux de verre
   ========================================================= */

#scene { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 0; display: block; }

body.imm { background: #131c26; color: var(--text-light); }
body.imm.no3d { background: linear-gradient(180deg, #0d1620, #17232f 45%, #0d151d); }
body.imm.lock { overflow: hidden; }
main.imm-main { position: relative; z-index: 1; }

/* ---------- Loader ---------- */
.loader {
  position: fixed; inset: 0; z-index: 300; background: #0a141c;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 20px;
  transition: opacity .8s ease, visibility .8s;
}
.loader.hide { opacity: 0; visibility: hidden; pointer-events: none; }
.ld-num { font-family: var(--mono); font-size: clamp(2.6rem, 6vw, 4.2rem); color: var(--lagoon-br); font-weight: 700; letter-spacing: .04em; line-height: 1; }
.ld-bar { width: min(320px, 70vw); height: 2px; background: rgba(79,212,218,.18); }
.ld-bar i { display: block; height: 100%; width: 0%; background: var(--lagoon-br); box-shadow: 0 0 12px var(--lagoon-br); }
.ld-cap { font-family: var(--mono); font-size: .62rem; letter-spacing: .32em; text-transform: uppercase; color: var(--text-lmut); text-align: center; }

/* ---------- HUD fixe ---------- */
.imm-hud {
  position: fixed; left: var(--gut); bottom: 26px; z-index: 50;
  display: flex; flex-direction: column; gap: 10px; pointer-events: none;
  opacity: 0; transition: opacity .9s .3s;
}
body.ready .imm-hud { opacity: 1; }
.imm-hud .chap { display: flex; flex-direction: column; gap: 3px; }
.imm-hud .chap b { font-family: var(--mono); font-size: .6rem; letter-spacing: .28em; color: var(--lagoon-br); font-weight: 700; }
.imm-hud .chap span { font-family: var(--serif); font-style: italic; font-size: 1.3rem; color: var(--cream); line-height: 1.1; }
.imm-hud .chap.switch b, .imm-hud .chap.switch span { animation: chapIn .55s ease both; }
@keyframes chapIn { from { opacity: 0; transform: translateY(9px); } }

.imm-rail { position: fixed; right: 14px; top: 50%; transform: translateY(-50%); width: 2px; height: 38vh; background: rgba(255,255,255,.14); z-index: 50; }
.imm-rail i { position: absolute; left: 0; top: 0; width: 100%; height: 0%; background: var(--lagoon-br); box-shadow: 0 0 10px var(--lagoon-br); }

/* ---------- Sections / panneaux ---------- */
.iview { position: relative; min-height: 106vh; display: flex; align-items: center; padding-block: 13vh; }
.iview .wrap { width: 100%; }

.ipanel {
  background: rgba(7,24,32,.62);
  border: 1px solid rgba(79,212,218,.16);
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  border-radius: 6px;
  padding: clamp(26px, 3.6vw, 48px);
  max-width: 620px;
  box-shadow: 0 30px 80px -30px rgba(0,0,0,.65);
}
.ipanel.wide { max-width: none; }
.ipanel.right { margin-left: auto; }
.ipanel.center { margin-inline: auto; text-align: center; max-width: 760px; }
.ipanel.bare { background: transparent; border: 0; backdrop-filter: none; -webkit-backdrop-filter: none; box-shadow: none; padding: 0; }
.iview .lede { color: #b9cdd1; }
.iview .eyebrow { color: var(--lagoon-br); }

/* ---------- Hero ---------- */
.ihero-grad { position: absolute; inset: 0; pointer-events: none; background: radial-gradient(ellipse 58% 54% at 30% 62%, rgba(4,15,21,.6), transparent 72%); }
.ihero h1 { color: var(--cream); text-shadow: 0 4px 44px rgba(3,16,22,.75); max-width: 14ch; }
.ihero .lede { max-width: 46ch; margin-top: 1.1em; text-shadow: 0 2px 18px rgba(3,16,22,.8); }
.ihero .cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 2em; }
.ihint {
  position: absolute; left: 50%; bottom: 30px; transform: translateX(-50%);
  display: inline-flex; align-items: center; gap: .8em;
  font-family: var(--mono); font-size: .64rem; letter-spacing: .3em; text-transform: uppercase; color: var(--text-lmut);
  white-space: nowrap;
}
.ihint i { width: 1px; height: 38px; background: linear-gradient(var(--lagoon-br), transparent); display: block; animation: hintDrop 1.8s ease infinite; }
@keyframes hintDrop { 0% { transform: scaleY(0); transform-origin: top; } 55% { transform: scaleY(1); transform-origin: top; } 100% { transform: scaleY(0); transform-origin: bottom; } }
@media (prefers-reduced-motion: reduce) { .ihint i { animation: none; } }

/* ---------- Grilles internes ---------- */
.iba { display: grid; grid-template-columns: .85fr 1.25fr; gap: clamp(24px, 4vw, 56px); align-items: center; }
.iia { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(24px, 4vw, 56px); align-items: center; }
.istats { display: grid; grid-template-columns: repeat(4, 1fr); }
.istats > div { padding: 4px 0 4px 24px; border-left: 1px solid rgba(79,212,218,.14); display: flex; flex-direction: column; gap: 2px; }
.istats > div:first-child { border-left: 0; padding-left: 0; }
.istats b { font-family: var(--serif); font-size: 1.55rem; font-weight: 600; color: var(--lagoon-br); line-height: 1.05; }
.istats span { font-family: var(--mono); font-size: .62rem; text-transform: uppercase; letter-spacing: .1em; color: var(--text-lmut); }

.isec-head { display: grid; grid-template-columns: 1.2fr .8fr; gap: clamp(20px, 4vw, 60px); align-items: end; margin-bottom: clamp(28px, 4vw, 48px); }

/* footer au-dessus du canvas */
.site-footer { position: relative; z-index: 1; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .isec-head { grid-template-columns: 1fr; align-items: start; }
  .istats { grid-template-columns: repeat(2, 1fr); gap: 18px 0; }
  .istats > div:nth-child(3) { border-left: 0; padding-left: 0; }
}
@media (max-width: 860px) {
  .ipanel { backdrop-filter: none; -webkit-backdrop-filter: none; background: rgba(7,22,30,.84); }
  .iba, .iia { grid-template-columns: 1fr; }
  .phase-grid, .slot-grid { grid-template-columns: 1fr; }
  .imm-rail { display: none; }
  .imm-hud { bottom: 16px; }
  .imm-hud .chap span { font-size: 1.05rem; }
  .iview { min-height: 100vh; padding-block: 9vh; }
}