:root{
  --bg:#fafbfc; --white:#fff; --ink:#0f172a; --muted:#64748b; --line:#e5e9ef;
  --blue:#3b82f6; --dark:#0f172a;
  --serif:"Instrument Serif",Georgia,serif;
  --sans:"Work Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --maxw:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:16px;font-weight:300;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
h1,h2,h3,.serif{font-family:var(--serif);font-weight:400;letter-spacing:-.01em;line-height:1.08;margin:0}
h1{font-size:clamp(2.6rem,6.4vw,5.1rem)}
h2{font-size:clamp(2rem,4.4vw,3.4rem)}
h3{font-size:1.5rem}
p{margin:0 0 1.1rem}
.muted{color:var(--muted)}
.blue{color:var(--blue)}
.label{font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);font-weight:400}
.lead{color:var(--muted);font-size:1.05rem;max-width:56ch}

/* ---- nav ---- */
header{position:fixed;inset:0 0 auto;z-index:50;transition:background .35s,box-shadow .35s,border-color .35s;
  border-bottom:1px solid transparent}
header.scrolled{background:rgba(250,251,252,.85);backdrop-filter:blur(14px);border-color:var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px}
.logo{font-family:var(--serif);font-size:1.45rem}
.nav ul{display:flex;gap:34px;list-style:none;margin:0;padding:0;font-size:.92rem;color:#334155}
.nav ul a{position:relative}
.nav ul a::after{content:"";position:absolute;left:0;bottom:-4px;width:0;height:1px;
  background:currentColor;transition:width .3s}
.nav ul a:hover::after{width:100%}
@media(max-width:880px){.nav ul{display:none}}

.btn{display:inline-flex;align-items:center;gap:9px;border-radius:999px;padding:13px 24px;
  font-size:.92rem;font-family:var(--sans);font-weight:400;border:1px solid transparent;
  transition:transform .25s,background .25s,color .25s,border-color .25s;cursor:pointer;white-space:nowrap}
.btn .ar{transition:transform .3s}
.btn:hover .ar{transform:translate(3px,-3px)}
.btn-dark{background:var(--dark);color:#fff}
.btn-dark:hover{background:#1e293b}
.btn-line{border-color:#cbd5e1;color:var(--ink);background:transparent}
.btn-line:hover{border-color:var(--ink)}
.btn-white{background:#fff;color:var(--dark)}

/* ---- hero ---- */
.hero{padding:170px 0 90px}
.badge{display:inline-flex;align-items:center;gap:10px;border:1px solid var(--line);background:#fff;
  border-radius:999px;padding:8px 18px;font-size:.8rem;color:var(--muted)}
.dot{width:7px;height:7px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 4px rgba(34,197,94,.16)}
.hero h1{margin:30px 0 28px;max-width:17ch}
.hero .lead{font-size:1.12rem;max-width:62ch}
.actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}

.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;margin-top:92px;
  padding-top:40px;border-top:1px solid var(--line)}
.stat b{display:block;font-family:var(--serif);font-weight:400;font-size:clamp(2rem,3.6vw,2.8rem);line-height:1}
.stat span{font-size:.88rem;color:var(--muted)}
@media(max-width:700px){.stats{grid-template-columns:repeat(2,1fr);gap:26px}}

/* ---- sections ---- */
section{padding:110px 0}
.alt{background:var(--white);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:end;margin-bottom:60px}
@media(max-width:860px){.sec-head{grid-template-columns:1fr;gap:20px;align-items:start}}
.sec-head .label{display:block;margin-bottom:22px}

/* ---- projets : rail 3D ---- */
.rail{display:flex;gap:30px;overflow-x:auto;overscroll-behavior-x:contain;scroll-behavior:auto;
  margin:0 calc(-50vw + 50%);padding:40px calc(50vw - 50%) 20px;
  cursor:grab;scrollbar-width:none;-ms-overflow-style:none}
.rail::-webkit-scrollbar{display:none}
.rail.drag{cursor:grabbing;user-select:none}
.slide{flex:0 0 clamp(290px,34vw,470px);will-change:transform}

/* la fiche = la capture, rien d'autre */
.shot{position:relative;display:block;aspect-ratio:16/10;border-radius:16px;overflow:hidden;
  border:1px solid rgba(255,255,255,.12);
  background:#0b1220;
  box-shadow:0 30px 60px -30px rgba(0,0,0,.85);transition:border-color .4s,box-shadow .4s}
.slide:hover .shot{border-color:rgba(255,255,255,.32);box-shadow:0 36px 80px -28px rgba(0,0,0,.95)}
.shot.ko{background:linear-gradient(135deg,#1e293b,#334155);display:grid;place-items:center;
  font-family:var(--serif);font-size:2.2rem;color:#fff}
.cap{position:absolute;inset:auto 0 0 0;padding:20px;display:flex;align-items:flex-end;
  justify-content:space-between;gap:14px;color:#fff;
  background:linear-gradient(transparent,rgba(4,9,18,.94));
  opacity:0;transform:translateY(10px);transition:opacity .4s,transform .4s}
.slide:hover .cap{opacity:1;transform:none}
.cap .nm{display:block;font-family:var(--serif);font-weight:400;font-size:1.3rem;line-height:1.15}
.cap .dm{font-size:.74rem;color:#9fb3cc}
.cap .go{font-size:1.05rem;flex:none}
.refl{height:86px;margin-top:5px;border-radius:0 0 16px 16px;
  background:#0b1220 center top/cover no-repeat;
  transform:scaleY(-1);opacity:.3;filter:blur(1px);pointer-events:none;
  -webkit-mask-image:linear-gradient(transparent 50%,#000);mask-image:linear-gradient(transparent 50%,#000)}
.hint{display:flex;justify-content:flex-end;align-items:center;gap:10px;margin-top:18px;
  font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.hint svg{stroke:var(--blue)}
/* section projets en sombre, comme la bande de Codoly */
#projets{background:var(--dark);color:#fff;border-top:0;border-bottom:0}
#projets .label{color:#64748b}
#projets .lead{color:#94a3b8}
#projets .hint{color:#64748b}

/* ---- approche ---- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.step{padding:28px 26px 0 0;border-top:1px solid var(--line)}
.step .n{font-family:var(--serif);font-size:1.5rem;color:var(--blue);display:block;margin-bottom:26px}
.step h3{font-size:1.2rem;margin-bottom:10px}
.step p{font-size:.92rem;color:var(--muted);margin:0}
@media(max-width:860px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.steps{grid-template-columns:1fr}}

/* ---- à propos ---- */
.about{display:grid;grid-template-columns:1.05fr .95fr;gap:70px;align-items:start}
@media(max-width:900px){.about{grid-template-columns:1fr;gap:44px}}
.checks{list-style:none;margin:28px 0 0;padding:0;display:grid;gap:16px}
.checks li{display:flex;gap:14px;font-size:.95rem;color:var(--muted)}
.checks svg{flex:none;margin-top:3px;stroke:var(--blue)}
.quote{background:#f1f4f9;border:1px solid var(--line);border-radius:22px;padding:40px}
.quote .q{font-family:var(--serif);font-size:clamp(1.3rem,2.4vw,1.75rem);line-height:1.3;margin:0 0 30px}
.who{display:flex;align-items:center;gap:14px;padding-bottom:26px;border-bottom:1px solid var(--line);margin-bottom:22px}
.av{width:46px;height:46px;border-radius:50%;background:var(--dark);color:#fff;display:grid;place-items:center;
  font-family:var(--serif);font-size:1.3rem}
.who b{font-weight:500;font-size:.98rem;display:block}
.who span{font-size:.85rem;color:var(--muted)}

/* ---- contact ---- */
.contact{background:var(--dark);color:#fff;text-align:center;padding:130px 0}
.contact .label{color:#94a3b8}
.contact h2{margin:24px 0 24px}
.contact .lead{margin:0 auto 42px;color:#cbd5e1}
.mailto{font-family:var(--serif);font-size:clamp(1.4rem,3.4vw,2.2rem);display:inline-block;
  border-bottom:1px solid rgba(255,255,255,.3);padding-bottom:6px;transition:border-color .3s}
.mailto:hover{border-color:#fff}
.contact .actions{justify-content:center;margin-top:40px}

footer{background:var(--dark);color:#94a3b8;border-top:1px solid rgba(255,255,255,.08);
  padding:34px 0;font-size:.85rem}
footer .wrap{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center}
footer .logo{color:#fff}

/* ---- barre de progression ---- */
#prog{position:fixed;top:0;left:0;height:2px;width:0;background:var(--blue);z-index:60}

/* ---- phrase tournante du titre ---- */
.rot{display:inline-grid;overflow:hidden;font-weight:400;
  padding-bottom:.08em;margin-bottom:-.08em;vertical-align:bottom}
.rot>i{grid-area:1/1;font-style:italic;color:var(--blue);white-space:nowrap;
  transform:translateY(110%);opacity:0;
  transition:transform .8s cubic-bezier(.16,.84,.44,1),opacity .45s}
.rot>i.on{transform:none;opacity:1}
.rot>i.out{transform:translateY(-110%);opacity:0}

/* ---- bandeau technos ---- */
.band{padding:24px 0;background:var(--bg);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.marquee{overflow:hidden;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.marquee+.marquee{margin-top:12px}
.mtrack{display:flex;gap:12px;width:max-content;animation:slide 46s linear infinite}
.marquee.rev .mtrack{animation-direction:reverse}
.band:hover .mtrack{animation-play-state:paused}
@keyframes slide{to{transform:translateX(-50%)}}
.tech{font-size:.82rem;padding:8px 17px;border:1px solid var(--line);border-radius:999px;
  color:var(--muted);white-space:nowrap;background:var(--bg)}

/* ---- les quatre couches ---- */
.layers{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:start}
.stack{position:relative;aspect-ratio:4/3}
@media(min-width:901px){.stack{position:sticky;top:130px}}
@media(max-width:900px){.layers{grid-template-columns:1fr;gap:34px}.stack{aspect-ratio:16/11}}
.pane{position:absolute;inset:0;background:#fff;border:1px solid var(--line);border-radius:18px;
  box-shadow:0 34px 70px -46px rgba(15,23,42,.55);overflow:hidden;transform-origin:50% 100%;
  transition:transform .85s cubic-bezier(.2,.7,.3,1),opacity .6s}
.ph{display:flex;align-items:center;gap:9px;padding:13px 18px;border-bottom:1px solid var(--line);
  font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.ph::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--blue);flex:none}
.pb{padding:22px}

.term{background:var(--dark);border-radius:12px;padding:16px 18px;color:#e2e8f0;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.76rem;line-height:1.95}
.term .pr{color:#4ade80}
.caret{display:inline-block;width:7px;height:.95em;background:#4ade80;vertical-align:-2px;
  animation:blink 1s steps(2) infinite}
@keyframes blink{50%{opacity:0}}
.res{display:grid;gap:1px;margin-top:12px;color:#94a3b8}
.res span{opacity:0;transform:translateY(6px);transition:opacity .45s,transform .45s}
.term.done .res span{opacity:1;transform:none}
.term.done .res span:nth-child(2){transition-delay:.13s}
.term.done .res span:nth-child(3){transition-delay:.26s}

.rows{display:grid;gap:14px}
.row{display:grid;grid-template-columns:72px 1fr;gap:12px;align-items:center}
.row b,.row i{height:9px;border-radius:5px;display:block}
.row b{background:#e8edf3}
.row i{background:var(--blue);opacity:.3;transform:scaleX(0);transform-origin:left;
  transition:transform .8s cubic-bezier(.2,.7,.3,1)}
.pane.act .row i{transform:none}
.row:nth-child(2) i{transition-delay:.1s}
.row:nth-child(3) i{transition-delay:.2s}
.row:nth-child(4) i{transition-delay:.3s}
.row:nth-child(5) i{transition-delay:.4s}

.wire{display:grid;gap:11px}
.wire .bar{height:28px;border-radius:9px;background:#eef2f7}
.wire .cols{display:grid;grid-template-columns:repeat(3,1fr);gap:11px}
.wire .box{height:66px;border-radius:11px;background:#eef2f7;opacity:0;transform:translateY(10px);
  transition:opacity .5s,transform .5s}
.pane.act .wire .box{opacity:1;transform:none}
.wire .box:nth-child(2){transition-delay:.12s}
.wire .box:nth-child(3){transition-delay:.24s}

.mini{display:grid;gap:14px;justify-items:start;padding:8px 4px}
.mini h4{font-family:var(--serif);font-weight:400;font-size:1.55rem;margin:0;line-height:1.1}
.mini .l{height:8px;border-radius:4px;background:#eef2f7;width:100%}
.mini .l.s{width:62%}
.mini .pill{background:var(--dark);color:#fff;border-radius:999px;padding:8px 16px;font-size:.74rem}

.ltxt{min-height:62vh;display:flex;flex-direction:column;justify-content:center;
  opacity:.3;transition:opacity .5s}
.ltxt.on{opacity:1}
.ltxt .n{color:var(--blue);font-family:var(--serif);font-size:1.4rem;margin-bottom:18px}
.ltxt p{color:var(--muted);margin:12px 0 0;max-width:40ch}
@media(max-width:900px){.ltxt{min-height:auto;opacity:1;padding:18px 0}}

/* trait qui se trace au-dessus des étapes */
.step::before{content:"";position:absolute;top:-1px;left:0;height:1px;width:0;background:var(--blue);
  transition:width .9s cubic-bezier(.2,.7,.3,1)}
.step{position:relative}
.step.in::before{width:100%}
.steps .step:nth-child(2)::before{transition-delay:.12s}
.steps .step:nth-child(3)::before{transition-delay:.24s}
.steps .step:nth-child(4)::before{transition-delay:.36s}

/* adresse mail qui déroule lettre par lettre */
.mailto .ch{display:inline-block;overflow:hidden;height:1em;line-height:1;vertical-align:bottom}
.mailto .roll{display:block;transition:transform .55s cubic-bezier(.16,.84,.44,1)}
.mailto .roll span{display:block;line-height:1}
.mailto:hover .roll{transform:translateY(-50%)}

/* ---- animations ---- */
.rv{opacity:0;transform:translateY(26px);transition:opacity .9s cubic-bezier(.2,.7,.3,1),transform .9s cubic-bezier(.2,.7,.3,1)}
.rv.in{opacity:1;transform:none}
.line{display:block;overflow:hidden;padding-bottom:.06em;margin-bottom:-.06em}
.line>span{display:block;transform:translateY(110%);animation:up 1s cubic-bezier(.16,.84,.44,1) both}
@keyframes up{to{transform:none}}
.fade-up{animation:fu .9s cubic-bezier(.2,.7,.3,1) both}
@keyframes fu{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){
  .rv{opacity:1;transform:none;transition:none}
  .fade-up{animation:none}
  .line>span{animation:none;transform:none}
  .mtrack,.caret{animation:none}
  .rot>i,.pane,.row i,.wire .box{transition:none}
  .ltxt{opacity:1}
  html{scroll-behavior:auto}
}

/* ===== pages internes, ajoute par build.py ===== */
.skip{position:absolute;left:-9999px;top:0;background:var(--dark);color:#fff;padding:12px 18px;z-index:99}
.skip:focus{left:8px;top:8px}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px}

.fil{padding:98px 0 0;font-size:.82rem;color:var(--muted)}
.fil a{text-decoration:underline;text-underline-offset:3px}
.fil span{color:var(--ink)}

.hero-page{padding:48px 0 56px}
.hero-page h1{max-width:18ch;margin-bottom:26px}
.hero-page .lead{font-size:1.12rem;max-width:62ch}
.hero-page .actions{margin-top:32px}

.texte{padding-bottom:40px}
.bloc{margin:0 0 54px;max-width:70ch}
.bloc h2{font-size:clamp(1.6rem,3vw,2.3rem);margin-bottom:20px}
.bloc p{color:#44506a}
.facteurs{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.facteurs li{color:#44506a;padding-left:18px;position:relative}
.facteurs li::before{content:"";position:absolute;left:0;top:.65em;width:7px;height:1px;background:var(--blue)}

.refs{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
@media(max-width:980px){.refs{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.refs{grid-template-columns:1fr}}
.ref{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;
  transition:transform .4s cubic-bezier(.2,.7,.3,1),box-shadow .4s}
.ref:hover{transform:translateY(-5px);box-shadow:0 26px 60px -34px rgba(15,23,42,.35)}
.ref img{width:100%;height:auto;aspect-ratio:16/10;object-fit:cover;object-position:top center;display:block;
  border-bottom:1px solid var(--line)}
.ref-txt{padding:22px 24px 26px}
.ref-txt h2,.ref-txt h3{font-size:1.4rem;margin:0 0 10px}
.ref-txt p{font-size:.93rem;color:var(--muted);margin:0}
.ref .meta{display:flex;gap:14px;font-size:.68rem;letter-spacing:.15em;text-transform:uppercase;
  color:var(--muted);margin:0 0 12px}
.url{display:inline-block;margin-top:16px;font-size:.8rem;color:var(--blue)}

.prestas{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:900px){.prestas{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.prestas{grid-template-columns:1fr}}
.presta{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px;
  transition:border-color .35s,transform .35s}
.presta:hover{border-color:#c7d2e2;transform:translateY(-3px)}
.presta h3{font-size:1.3rem;margin-bottom:12px}
.presta p{font-size:.93rem;color:var(--muted);margin:0}

.faq{display:grid;gap:0;max-width:78ch;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{cursor:pointer;padding:22px 0;list-style:none;display:flex;justify-content:space-between;gap:20px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-family:var(--serif);font-size:1.5rem;line-height:1;color:var(--blue)}
.faq-item[open] summary::after{content:"–"}
.faq-item h3{font-size:1.12rem;font-family:var(--sans);font-weight:400;margin:0}
.faq-rep{padding:0 0 24px;color:#44506a;max-width:68ch}

.liens-internes{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:12px}
.liens-internes a{display:inline-block;border:1px solid var(--line);border-radius:999px;padding:11px 20px;
  font-size:.9rem;transition:border-color .3s,color .3s}
.liens-internes a:hover{border-color:var(--ink)}

.form-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:60px;align-items:start}
@media(max-width:900px){.form-grid{grid-template-columns:1fr;gap:40px}}
.form{background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px;display:grid;gap:18px}
.form h2,.form-side h2{font-size:1.5rem;margin:0 0 6px}
.champ{display:grid;gap:7px;font-size:.9rem}
.champ span{color:#44506a}
.champ input,.champ select,.champ textarea{font:inherit;font-size:.95rem;padding:12px 14px;
  border:1px solid var(--line);border-radius:11px;background:var(--bg);color:var(--ink);width:100%}
.champ input:focus,.champ select:focus,.champ textarea:focus{outline:2px solid var(--blue);outline-offset:1px;border-color:transparent}
.form button{justify-self:start;margin-top:6px}
.form-note{font-size:.82rem;color:var(--muted);margin:0}
.mail-simple{font-family:var(--serif);font-size:1.4rem;border-bottom:1px solid var(--line)}
.suite{color:#44506a;padding-left:20px;display:grid;gap:10px;font-size:.95rem}

.todo{background:#fff7ed;border:1px solid #fed7aa;border-radius:12px;padding:16px 20px;color:#9a3412;font-size:.92rem}
.todo-inline{background:#fff7ed;border:1px solid #fed7aa;border-radius:6px;padding:1px 7px;color:#9a3412}
.todo code{background:rgba(0,0,0,.06);padding:1px 6px;border-radius:5px}

.btn-line-light{border:1px solid rgba(255,255,255,.3);color:#fff}
.btn-line-light:hover{border-color:#fff}

.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:34px}
@media(max-width:800px){.foot-grid{grid-template-columns:1fr;gap:28px}}
.foot-h{font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;color:#64748b;
  font-family:var(--sans);font-weight:500;margin:0 0 16px}
.foot-grid ul{list-style:none;margin:0;padding:0;display:grid;gap:10px;font-size:.9rem}
.foot-grid a:hover{color:#fff}
.foot-p{font-size:.9rem;max-width:42ch;margin-top:14px}
.foot-bas{display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;
  border-top:1px solid rgba(255,255,255,.1);padding-top:24px;font-size:.84rem}
.shot img{width:100%;height:100%;object-fit:cover;object-position:top center;display:block}