:root{
  --bg:#ffffff; --bg2:#f4f6fb; --ink:#0f172a; --muted:#5b6478; --line:#e3e7f0;
  --dark:#0b1020; --dark2:#121a33;
  --a1:#3b6cff; --a2:#8b5cf6; --grad:linear-gradient(120deg,var(--a1),var(--a2));
  --radius:16px; --shadow:0 10px 30px -12px rgba(15,23,42,.18);
  --font:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%}
a{color:var(--a1)}
h1,h2,h3{line-height:1.2;margin:0 0 .6em;letter-spacing:-.02em}
h2{font-size:clamp(1.6rem,3vw,2.2rem)}
h3{font-size:1.15rem}
.wrap{width:min(1140px,100% - 32px);margin-inline:auto}
.narrow{width:min(820px,100% - 32px)}
.center{text-align:center}
.muted{color:var(--muted);font-size:.92rem}
mark.todo{background:#fff1d6;color:#9a5a00;border-radius:4px;padding:0 .3em}
.ico{width:1.25em;height:1.25em;flex:none}

/* boutons */
.btn{display:inline-flex;align-items:center;gap:.5em;border:0;border-radius:999px;padding:.7em 1.3em;font:600 .95rem var(--font);color:#fff;background:var(--grad);text-decoration:none;cursor:pointer;box-shadow:0 8px 20px -8px rgba(59,108,255,.6);transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-1px);box-shadow:0 12px 24px -8px rgba(59,108,255,.7)}
.btn:disabled{opacity:.6;cursor:wait;transform:none}
.btn-lg{padding:.9em 1.6em;font-size:1rem}
.btn-sm{padding:.5em 1em;font-size:.88rem}
.btn-ghost{background:transparent;color:inherit;box-shadow:inset 0 0 0 1.5px currentColor}
.btn-ghost:hover{box-shadow:inset 0 0 0 1.5px currentColor;background:rgba(255,255,255,.08)}

/* navigation */
.nav{position:sticky;top:0;z-index:50;background:rgba(11,16,32,.88);backdrop-filter:blur(12px);color:#fff;border-bottom:1px solid rgba(255,255,255,.06)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:inline-flex;align-items:center;gap:.55em;color:inherit;text-decoration:none;font-weight:700;font-size:1.2rem}
.logo-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--grad);color:#fff;font-weight:800}
.logo-txt b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.menu{display:flex;align-items:center;gap:1.6rem}
.menu a:not(.btn){color:#cfd6ea;text-decoration:none;font-weight:500;font-size:.95rem}
.menu a:not(.btn):hover{color:#fff}
.burger{display:none;background:none;border:0;padding:8px;cursor:pointer}
.burger span{display:block;width:22px;height:2px;background:#fff;margin:5px 0;border-radius:2px;transition:.2s}

/* hero */
.hero{position:relative;overflow:hidden;background:var(--dark);color:#fff;padding:clamp(70px,11vw,130px) 0 clamp(70px,9vw,110px)}
.hero-bg{position:absolute;inset:0;background:
  radial-gradient(600px 400px at 85% 10%,rgba(139,92,246,.35),transparent 70%),
  radial-gradient(700px 500px at 10% 100%,rgba(59,108,255,.35),transparent 70%);
}
.hero-bg::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(ellipse at center,#000 30%,transparent 75%)}
.hero-in{position:relative;max-width:860px}
.kicker{display:inline-block;margin:0 0 1.2rem;padding:.35em .9em;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);font-size:.85rem;color:#cfd6ea}
.hero h1{font-size:clamp(2.1rem,5.2vw,3.6rem);margin-bottom:.45em}
.hero h1 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:clamp(1.05rem,1.6vw,1.2rem);color:#cfd6ea;max-width:680px}
.hero-cta{display:flex;flex-wrap:wrap;gap:.8rem;margin:2rem 0 1.8rem}
.hero-points{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.6rem 1.6rem;color:#aab4cf;font-size:.95rem}
.hero-points li{display:flex;align-items:center;gap:.45em}
.hero-points .ico{color:#7c9bff}

/* sections */
.sec{padding:clamp(60px,8vw,96px) 0}
.sec-alt{background:var(--bg2)}
.sec-head{max-width:640px;margin-bottom:2.4rem}
.sec-head p{color:var(--muted);margin:0}
.grid{display:grid;gap:1.2rem}
.cards{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card p{color:var(--muted);margin:0}
.card-ico{display:grid;place-items:center;width:46px;height:46px;border-radius:12px;margin-bottom:1rem;color:var(--a1);background:linear-gradient(120deg,rgba(59,108,255,.12),rgba(139,92,246,.12))}
.card-ico .ico{width:24px;height:24px}

.steps{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.2rem;counter-reset:s}
.steps li{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem}
.steps p{color:var(--muted);margin:0}
.step-n{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--grad);color:#fff;font-weight:700;margin-bottom:.9rem}

.refs{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.ref{display:flex;flex-direction:column;gap:.3rem;padding:1.4rem 1.5rem;border-radius:var(--radius);border:1px solid var(--line);text-decoration:none;color:inherit;transition:border-color .2s,box-shadow .2s}
.ref:hover{border-color:var(--a1);box-shadow:var(--shadow)}
.ref span{color:var(--muted);font-size:.95rem}
.ref em{font-style:normal;color:var(--a1);font-weight:600;font-size:.9rem;margin-top:.4rem}

.about{display:grid;grid-template-columns:1.3fr 1fr;gap:3rem;align-items:center}
.about p{color:var(--muted)}
.about-box{display:grid;gap:1rem;background:var(--dark);color:#fff;border-radius:var(--radius);padding:1.8rem;box-shadow:var(--shadow)}
.about-box>div{display:flex;gap:.9rem;align-items:flex-start}
.about-box .ico{color:#8fa8ff;width:26px;height:26px;margin-top:2px}
.about-box b{display:block}
.about-box span{color:#aab4cf;font-size:.93rem}

/* contact */
.contact{display:grid;grid-template-columns:1fr 1.4fr;gap:3rem;align-items:start}
.contact-info p{color:var(--muted)}
.contact-mail{display:flex;align-items:center;gap:.6rem;font-weight:600}
.contact-mail .ico{color:var(--a1)}
.form{display:grid;gap:1rem;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:clamp(1.2rem,3vw,2rem);box-shadow:var(--shadow)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.form label{display:grid;gap:.35rem;font-weight:600;font-size:.9rem}
.form input,.form select,.form textarea{width:100%;font:inherit;font-weight:400;color:var(--ink);background:#fbfcff;border:1.5px solid var(--line);border-radius:10px;padding:.7em .85em;transition:border-color .15s,box-shadow .15s}
.form textarea{resize:vertical;min-height:140px}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--a1);box-shadow:0 0 0 4px rgba(59,108,255,.15)}
.form .btn{justify-self:start}
.form-note{margin:0;color:var(--muted);font-size:.85rem}
.form-msg{margin:0;font-weight:600;min-height:1.4em}
.form-msg.ok{color:#0f8a4b}.form-msg.err{color:#c0262d}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

/* pages légales */
.prose h1{font-size:clamp(1.9rem,4vw,2.6rem)}
.prose h2{font-size:1.3rem;margin-top:2.2rem}
.prose p,.prose li{color:#2c3447}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px}
table{width:100%;border-collapse:collapse;font-size:.9rem;min-width:640px}
th,td{text-align:left;padding:.7rem .8rem;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--bg2)}
tr:last-child td{border-bottom:0}
.big404{font-size:6rem;font-weight:800;margin:0;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* pied de page */
.foot{background:var(--dark);color:#aab4cf;padding:56px 0 24px;font-size:.93rem}
.foot a{color:#cfd6ea;text-decoration:none}
.foot a:hover{color:#fff}
.foot .logo{color:#fff;margin-bottom:.6rem}
.foot-in{display:flex;flex-wrap:wrap;justify-content:space-between;gap:2rem}
.foot-brand{max-width:360px}
.foot-links{display:grid;gap:.5rem;align-content:start}
.foot-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.5rem;margin-top:2.5rem;padding-top:1.2rem;border-top:1px solid rgba(255,255,255,.08);font-size:.85rem}

/* apparition au défilement */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s,transform .6s}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* mobile */
@media (max-width:860px){
  .about,.contact{grid-template-columns:1fr;gap:2rem}
  .burger{display:block}
  .menu{position:absolute;top:64px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:var(--dark);padding:.5rem 16px 1rem;border-bottom:1px solid rgba(255,255,255,.08);display:none}
  .menu.open{display:flex}
  .menu a:not(.btn){padding:.8rem 0;border-bottom:1px solid rgba(255,255,255,.06)}
  .menu .btn{margin-top:.8rem;justify-content:center}
  .burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .burger[aria-expanded="true"] span:nth-child(2){opacity:0}
  .burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
}
@media (max-width:560px){
  .row2{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
  .form .btn{justify-self:stretch;justify-content:center}
}