/* TEACHING — hub, mobile first. Mêmes jetons que les modules. */
:root {
  --bg: #07070c; --bg2: #0e0e17; --fg: #f3f1ec; --mut: rgba(243, 241, 236, .58);
  --line: rgba(255, 255, 255, .09); --card: rgba(255, 255, 255, .035);
  --l7: #ff4d8d; --l6: #ff7a45; --l5: #ffc53d; --l4: #5cdb95; --l3: #36cfc9; --l2: #4d7cff; --l1: #9d5cff;
  --display: "Space Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --ease: cubic-bezier(.2, .8, .2, 1); --spring: cubic-bezier(.34, 1.56, .64, 1);
  --top: calc(60px + env(safe-area-inset-top, 0px));
  color-scheme: dark;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100dvh; background: var(--bg); color: var(--fg); font: 400 16px/1.55 var(--display); overflow-x: hidden; padding: var(--top) 0 calc(24px + env(safe-area-inset-bottom, 0px)); -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: transparent; }
body::before { content: ""; position: fixed; inset: -20% -20% auto; height: 80vh; z-index: -1; pointer-events: none; background: radial-gradient(50% 50% at 30% 30%, rgba(157, 92, 255, .22), transparent 70%), radial-gradient(40% 40% at 80% 20%, rgba(255, 77, 141, .16), transparent 70%); filter: blur(20px); }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--l3); outline-offset: 3px; border-radius: 10px; }
.grain { position: fixed; inset: 0; z-index: 90; pointer-events: none; opacity: .07; mix-blend-mode: overlay; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E"); }
.glow { position: fixed; width: 420px; height: 420px; left: -210px; top: -210px; z-index: -1; pointer-events: none; border-radius: 50%; background: radial-gradient(circle, rgba(54, 207, 201, .13), transparent 65%); transform: translate(var(--gx, -999px), var(--gy, -999px)); transition: transform .5s var(--ease); }
@media (hover: none) { .glow { display: none; } }

.top { position: fixed; inset: 0 0 auto; z-index: 50; display: flex; align-items: center; gap: 10px; padding: calc(10px + env(safe-area-inset-top, 0px)) 16px 10px; background: rgba(7, 7, 12, .72); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.logo { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 1.15rem; letter-spacing: -.02em; text-decoration: none; margin-right: auto; }
.logo em { font-style: normal; color: var(--mut); font-weight: 500; }
.logo-bars { display: grid; gap: 2px; width: 18px; }
.logo-bars i { height: 2.5px; border-radius: 2px; background: var(--l7); }
.logo-bars i:nth-child(2) { background: var(--l6); width: 85%; } .logo-bars i:nth-child(3) { background: var(--l5); }
.logo-bars i:nth-child(4) { background: var(--l4); width: 70%; } .logo-bars i:nth-child(5) { background: var(--l3); }
.logo-bars i:nth-child(6) { background: var(--l2); width: 90%; } .logo-bars i:nth-child(7) { background: var(--l1); }
.count { font: 600 .7rem var(--mono); color: var(--mut); padding: 6px 12px; border-radius: 99px; border: 1px solid var(--line); background: var(--card); }

main { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 14px; font: 500 .72rem/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--mut); }
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--l4); box-shadow: 0 0 12px var(--l4); animation: pulse 2s infinite; }
@keyframes pulse { 50% { opacity: .4; } }
.title { margin: 0; font-weight: 700; font-size: clamp(2.8rem, 13vw, 6.4rem); line-height: .92; letter-spacing: -.045em; }
.h2 { margin: 0; font-weight: 700; font-size: clamp(2rem, 9vw, 3.8rem); line-height: .95; letter-spacing: -.04em; }
.grad { background: linear-gradient(90deg, var(--l7), var(--l6), var(--l5), var(--l4), var(--l3), var(--l2), var(--l1), var(--l7)); background-size: 200% 100%; -webkit-background-clip: text; background-clip: text; color: transparent; animation: flow 8s linear infinite; }
@keyframes flow { to { background-position: 200% 0; } }
.lead { max-width: 54ch; margin: 18px 0 0; color: var(--mut); font-size: 1.04rem; }
.hero { padding: 30px 0 10px; animation: viewIn .7s var(--ease) both; }
@keyframes viewIn { from { opacity: 0; transform: translateY(18px); filter: blur(6px); } }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.primary, .ghost { display: inline-flex; align-items: center; padding: 14px 20px; border-radius: 16px; font-weight: 700; text-decoration: none; transition: transform .2s var(--spring); }
.primary { background: var(--fg); color: #0a0a10; }
.ghost { border: 1px solid var(--line); background: var(--card); font-weight: 600; }
.primary:active, .ghost:active { transform: scale(.96); }

.stage3d { position: relative; height: min(62vh, 560px); min-height: 360px; margin: 0 -16px; }
.stage3d canvas { display: block; width: 100%; height: 100%; touch-action: pan-y; cursor: grab; }
.stage3d.no-gl { display: none; }
.stage-cap { position: absolute; inset: auto 16px 10px; margin: 0; text-align: center; font: 500 .7rem var(--mono); color: var(--mut); text-transform: uppercase; letter-spacing: .08em; }
.stage-cap b { color: var(--c, var(--fg)); }

section { margin-top: 26px; }
.sec-head { margin-bottom: 18px; }

/* Parcours */
.path { list-style: none; margin: 0; padding: 0 0 0 26px; display: grid; gap: 14px; position: relative; }
.path::before { content: ""; position: absolute; left: 9px; top: 10px; bottom: 10px; width: 2px; border-radius: 2px; background: linear-gradient(var(--l3), var(--l7), var(--l2), var(--l4), var(--l5), var(--l6)); opacity: .6; }
.path > li { position: relative; }
.path > li::before { content: attr(data-i); position: absolute; left: -26px; top: 18px; display: grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; font: 700 .64rem var(--mono); color: #0a0a10; background: var(--c); box-shadow: 0 0 14px var(--c); }
.mod {
  position: relative; display: grid; gap: 10px; padding: 18px; border-radius: 26px; text-decoration: none; overflow: hidden;
  background: linear-gradient(var(--bg2), var(--bg2)) padding-box, linear-gradient(130deg, var(--c), transparent 55%) border-box;
  border: 1.5px solid transparent; transition: transform .4s var(--spring), box-shadow .4s;
  animation: viewIn .6s var(--ease) both; animation-delay: calc(var(--i) * 90ms);
}
.mod::after { content: ""; position: absolute; inset: 0; background: radial-gradient(70% 90% at 0% 0%, color-mix(in srgb, var(--c) 18%, transparent), transparent); pointer-events: none; }
.mod:hover, .mod:focus-visible, .mod.hl { transform: translateY(-3px) rotate(-.3deg); box-shadow: 0 20px 50px color-mix(in srgb, var(--c) 22%, transparent); }
.mod-top { display: flex; align-items: center; gap: 12px; }
.mod-ic { display: grid; place-items: center; width: 52px; height: 52px; flex: none; border-radius: 16px; font-size: 1.6rem; background: color-mix(in srgb, var(--c) 18%, transparent); }
.mod h3 { margin: 0; font-size: 1.45rem; letter-spacing: -.03em; line-height: 1.05; }
.mod h3 small { display: block; font: 500 .74rem var(--mono); color: var(--c); letter-spacing: 0; margin-top: 4px; }
.mod p { margin: 0; color: var(--mut); font-size: .95rem; }
.mod ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.mod li { font-size: .76rem; padding: 5px 9px; border-radius: 10px; background: rgba(255, 255, 255, .05); border: 1px solid var(--line); }
.mod-foot { display: flex; justify-content: space-between; align-items: center; gap: 8px; font: 600 .74rem var(--mono); }
.mod-foot .layer { color: var(--c); }
.mod-foot .go { padding: 8px 14px; border-radius: 99px; background: var(--c); color: #0a0a10; }
.mod .seen { position: absolute; top: 14px; right: 14px; font: 600 .62rem var(--mono); color: var(--l4); }

/* Méthode */
.pillars { display: grid; gap: 10px; }
.pillars article { padding: 18px; border-radius: 22px; background: var(--card); border: 1px solid var(--line); }
.pillars .pi { display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 14px; font-size: 1.3rem; background: color-mix(in srgb, var(--c) 18%, transparent); margin-bottom: 10px; }
.pillars b { display: block; font-size: 1.1rem; margin-bottom: 4px; }
.pillars p { margin: 0; color: var(--mut); font-size: .92rem; }

.foot { max-width: 1120px; margin: 40px auto 0; padding: 20px 16px; border-top: 1px solid var(--line); color: var(--mut); font-size: .84rem; text-align: center; }
.foot b { color: var(--fg); }

@media (min-width: 900px) {
  .intro { display: grid; grid-template-columns: 1.1fr 1fr; gap: 32px; align-items: center; min-height: calc(100dvh - var(--top)); }
  .stage3d { margin: 0; height: min(80vh, 720px); border-radius: 32px; border: 1px solid var(--line); background: radial-gradient(60% 60% at 50% 60%, rgba(77, 124, 255, .1), transparent); }
  .path { grid-template-columns: repeat(2, 1fr); padding: 0; gap: 16px; }
  .path::before, .path > li::before { display: none; }
  .path > li:first-child { grid-column: 1 / -1; }
  .path > li:nth-child(even):last-child { grid-column: 1 / -1; }
  .pillars { grid-template-columns: repeat(3, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}