/* Layout : un seul monde noir/jaune assumé. Hero typographique géant avec révélation au curseur,
   bandeau incliné, manifeste en diptyque, expertises en lignes pleine largeur, méthode, références à venir, brief. */
:root{
  --black:#0E0D0B;      /* noir chaud, légèrement teinté vers le jaune */
  --yellow:#FFA900;     /* jaune de marque */
  --cream:#F3EEE2;      /* blanc cassé pour le texte sur noir */
  --smoke:#8C8577;      /* neutre chaud pour le texte secondaire */
  --line:#2A2722;

  --bg:var(--black); --fg:var(--cream); --muted:var(--smoke); --rule:var(--line);
  --pop:var(--yellow); --on-pop:var(--black);

  --display:"Archivo","Arial Narrow","Helvetica Neue",Arial,sans-serif;
  --body:"Hanken Grotesk","Helvetica Neue",Arial,sans-serif;
  --mono:"Martian Mono",ui-monospace,"SF Mono",Menlo,monospace;

  --gutter:clamp(16px,4vw,56px);
  color-scheme:dark;
}
body[data-mode="yellow"]{
  --bg:var(--yellow); --fg:var(--black); --muted:#5E4300; --rule:#D98F00;
  --pop:var(--black); --on-pop:var(--yellow);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--fg);font-family:var(--body);font-size:17px;line-height:1.55;
  transition:background-color .6s ease,color .6s ease;overflow-x:hidden}
a{color:inherit}
:focus-visible{outline:3px solid var(--pop);outline-offset:3px}
.by-wrap{padding-inline:var(--gutter);max-width:1440px;margin-inline:auto}
.mono{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase}
.disp{font-family:var(--display);font-stretch:68%;font-weight:900;line-height:.98;letter-spacing:-.01em;padding-top:.08em;text-transform:uppercase;text-wrap:balance}

/* ---------- Nav ---------- */
.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--rule);transition:background-color .6s}
.nav .by-wrap{display:flex;align-items:center;gap:24px;padding-block:14px}
.logo{display:block;height:44px;border-radius:10px;padding:4px 8px;background:var(--black)}
.logo img{height:100%;width:auto;display:block}
.links{display:flex;gap:28px;margin-left:auto}
.links a{text-decoration:none;font-weight:500;font-size:15px;position:relative}
.links a::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;background:var(--pop);transform:scaleX(0);transform-origin:left;transition:transform .3s}
.links a:hover::after{transform:scaleX(1)}
.switch{display:flex;border:1.5px solid var(--fg);border-radius:999px;padding:3px;gap:2px;background:none;cursor:pointer;font:inherit;color:inherit}
.switch span{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;padding:6px 10px;border-radius:999px;transition:background .4s,color .4s}
.switch .b{background:var(--fg);color:var(--bg)}
body[data-mode="yellow"] .switch .b{background:none;color:var(--fg)}
body[data-mode="yellow"] .switch .y{background:var(--fg);color:var(--bg)}
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--pop);color:var(--on-pop);text-decoration:none;font-weight:700;
  padding:12px 20px;border-radius:999px;border:0;font:700 15px/1 var(--body);cursor:pointer;transition:transform .2s}
.btn:hover{transform:translateY(-2px)}
.btn svg{width:16px;height:16px}

/* ---------- Hero ---------- */
.hero{padding-block:clamp(28px,5vw,64px) clamp(36px,6vw,80px)}
.hero-top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px 24px;color:var(--muted);margin-bottom:clamp(16px,3vw,36px)}
.stage{position:relative;cursor:crosshair;touch-action:pan-y}
.stage .layer{font-size:clamp(78px,19vw,290px);margin:0;padding-block:.1em .04em}
.stage .layer span{display:block}
.stage .base .accent{color:var(--pop)}
.stage .reveal{position:absolute;inset:0;background:var(--pop);color:var(--on-pop);pointer-events:none;
  clip-path:circle(var(--r,0px) at var(--x,70%) var(--y,50%));will-change:clip-path}
.stage .reveal .accent{color:var(--on-pop);-webkit-text-stroke:0}
.hint{display:inline-flex;align-items:center;gap:10px;color:var(--muted);margin-top:18px}
.hint i{width:10px;height:10px;border-radius:50%;background:var(--pop);display:block;animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{50%{transform:scale(1.8);opacity:.4}}
.hero-foot{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:32px;align-items:end;margin-top:clamp(28px,4vw,52px)}
.hero-foot p{font-size:clamp(18px,1.6vw,22px);max-width:34ch;margin:0}
.hero-foot p strong{color:var(--pop);font-weight:700}
.hero-cta{display:flex;gap:14px;justify-content:flex-end;flex-wrap:wrap}
.ghost{background:none;color:var(--fg);border:1.5px solid var(--fg)}

/* ---------- Bandeau ---------- */
.band{background:var(--pop);color:var(--on-pop);transform:rotate(-2deg);margin-block:clamp(24px,4vw,48px);margin-inline:-20px;overflow:hidden;
  border-block:3px solid var(--bg)}
.band .track{display:flex;width:max-content;animation:slide 32s linear infinite}
.band ul{display:flex;align-items:center;gap:28px;list-style:none;margin:0;padding:16px 14px}
.band li{font-family:var(--display);font-stretch:68%;font-weight:900;font-size:clamp(28px,4vw,52px);text-transform:uppercase;white-space:nowrap;line-height:1.2;padding-top:.06em}
.band img{width:clamp(30px,3.6vw,46px);height:auto;display:block}
@keyframes slide{to{transform:translateX(-50%)}}

/* ---------- Sections ---------- */
section{scroll-margin-top:80px}
.sec{padding-block:clamp(64px,9vw,128px)}
.sec-head{display:flex;justify-content:space-between;align-items:end;gap:24px;flex-wrap:wrap;margin-bottom:clamp(32px,5vw,64px)}
.sec-head h2{font-size:clamp(52px,9vw,128px);margin:0}
.sec-head p{max-width:40ch;color:var(--muted);margin:0}
.kicker{color:var(--pop);display:block;margin-bottom:14px}

/* Manifeste : diptyque */
.duo{display:grid;grid-template-columns:1fr 1fr;border-radius:28px;overflow:hidden;border:1.5px solid var(--fg)}
.duo > div{padding:clamp(28px,4vw,56px);min-width:0;display:flex;flex-direction:column;gap:18px}
.duo .n{background:var(--black);color:var(--cream)}
.duo .j{background:var(--yellow);color:var(--black)}
.duo h3{font-size:clamp(56px,8vw,112px);margin:0}
.duo p{margin:0;font-size:18px;max-width:36ch}
.duo ul{list-style:none;padding:0;margin:auto 0 0;display:flex;flex-wrap:wrap;gap:8px}
.duo li{border:1.5px solid currentColor;border-radius:999px;padding:6px 14px;font-weight:500;font-size:14px}
.duo-foot{font-size:clamp(22px,2.6vw,34px);font-weight:500;line-height:1.25;max-width:30ch;margin:clamp(28px,4vw,48px) 0 0;text-wrap:balance}
.duo-foot em{font-style:normal;background:var(--pop);color:var(--on-pop);padding:0 .2em;border-radius:4px}

/* Expertises */
.services{border-top:1.5px solid var(--fg)}
.svc{position:relative;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:16px 40px;align-items:center;
  padding-block:clamp(22px,3vw,36px);padding-inline:12px;border-bottom:1.5px solid var(--fg);isolation:isolate;transition:color .35s}
.svc::before{content:"";position:absolute;inset:0;background:var(--pop);transform:scaleY(0);transform-origin:bottom;transition:transform .45s cubic-bezier(.7,0,.2,1);z-index:-1}
.svc:hover{color:var(--on-pop)}
.svc:hover::before{transform:scaleY(1)}
.svc h3{font-size:clamp(46px,7.4vw,108px);margin:0;transition:transform .45s cubic-bezier(.7,0,.2,1)}
.svc:hover h3{transform:translateX(14px)}
.svc .txt{display:flex;flex-direction:column;gap:12px}
.svc p{margin:0;max-width:46ch}
.tags{display:flex;flex-wrap:wrap;gap:6px 14px;color:var(--muted);transition:color .35s}
.svc:hover .tags{color:var(--on-pop)}

/* Méthode */
.steps{display:grid;grid-template-columns:repeat(var(--n,5),minmax(0,1fr));gap:0;counter-reset:s;border-left:1.5px solid var(--rule)}
.step{padding:6px 20px 0;border-right:1.5px solid var(--rule);min-width:0}
.step b{display:block;font-family:var(--display);font-stretch:68%;font-weight:900;font-size:clamp(70px,7vw,110px);line-height:1;color:var(--pop)}
.step h3{font-size:22px;margin:14px 0 8px;font-weight:700}
.step p{margin:0;color:var(--muted);font-size:15.5px}
.promises{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:clamp(40px,6vw,72px)}
.promise{border-top:3px solid var(--pop);padding-top:16px}
.promise h3{margin:0 0 6px;font-size:20px}
.promise p{margin:0;color:var(--muted)}

/* Références */
.refs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.slot{border:1.5px dashed var(--muted);border-radius:22px;min-height:200px;padding:22px;display:flex;flex-direction:column;justify-content:space-between;gap:20px;
  position:relative;overflow:hidden;transition:border-color .3s}
.slot:hover{border-color:var(--pop)}
.slot .mono{color:var(--muted)}
.slot strong{font-family:var(--display);font-stretch:75%;font-weight:800;font-size:clamp(30px,3vw,42px);line-height:1.05;text-transform:uppercase;padding-top:.06em}
.slot .soon{display:inline-flex;align-items:center;gap:8px}
.slot .soon::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--pop)}
.slot.cta{border:0;background:var(--pop);color:var(--on-pop);text-decoration:none}
.slot.cta .mono{color:var(--on-pop)}
.slot.cta svg{width:40px;height:40px;transition:transform .3s}
.slot.cta:hover svg{transform:rotate(-45deg)}

/* Contact */
.contact{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:clamp(32px,5vw,80px)}
.contact h2{font-size:clamp(64px,11vw,170px);margin:0 0 24px}
.contact h2 span{color:var(--pop)}
.coords{display:grid;gap:14px;margin-top:28px}
.coords div{display:grid;grid-template-columns:120px 1fr;gap:12px;border-top:1px solid var(--rule);padding-top:12px}
.coords .mono{color:var(--muted);padding-top:4px}
.todo{color:var(--muted);font-style:italic}
form{display:grid;gap:18px;background:color-mix(in srgb,var(--fg) 6%,transparent);border:1.5px solid var(--rule);border-radius:26px;padding:clamp(20px,3vw,36px)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
label{display:grid;gap:8px;font-weight:500;font-size:14px}
input,textarea{font:inherit;color:var(--fg);background:transparent;border:0;border-bottom:1.5px solid var(--muted);padding:8px 2px;border-radius:0;width:100%;min-width:0}
input:focus,textarea:focus{outline:none;border-color:var(--pop)}
textarea{resize:vertical;min-height:96px}
fieldset{border:0;padding:0;margin:0;display:grid;gap:10px;min-width:0}
legend{font-weight:500;font-size:14px;margin-bottom:10px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip input{position:absolute;opacity:0;pointer-events:none}
.chip span{display:inline-block;border:1.5px solid var(--fg);border-radius:999px;padding:8px 14px;font-size:14px;cursor:pointer;transition:background .2s,color .2s}
.chip input:checked + span{background:var(--pop);color:var(--on-pop);border-color:var(--pop)}
.chip input:focus-visible + span{outline:3px solid var(--pop);outline-offset:2px}
.status{margin:0;font-size:14.5px;color:var(--muted)}
.status.ok{color:var(--fg);border-left:3px solid var(--pop);padding-left:12px}

/* Footer */
footer{border-top:1.5px solid var(--rule);padding-block:36px 48px}
footer .by-wrap{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px}
footer p{margin:0;color:var(--muted)}
.big-foot{font-size:clamp(40px,8vw,120px);padding-block:clamp(24px,4vw,48px) 0;color:var(--pop);margin:0}


@media (max-width:900px){
  .links{display:none}
  .switch{margin-left:auto}
  .hero-foot,.contact{grid-template-columns:1fr}
  .hero-cta{justify-content:flex-start}
  .duo{grid-template-columns:1fr}
  .svc{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr;border-left:0}
  .step{border-right:0;border-top:1.5px solid var(--rule);padding:16px 0 20px;display:grid;grid-template-columns:72px 1fr;gap:0 16px}
  .step b{font-size:64px;grid-row:span 2}
  .step h3{margin-top:4px}
  .promises,.refs{grid-template-columns:1fr}
}
@media (min-width:901px) and (max-width:1100px){ .refs{grid-template-columns:1fr 1fr} }
@media (max-width:520px){
  .nav .btn{display:none}
  .row2{grid-template-columns:1fr}
  .logo{height:38px}
  .coords div{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
}