:root{
    --blue1:#386BFF; --blue2:#2563EB; --blue-deep:#1B47C4;
    --ink:#15233B; --muted:#5B6B82; --soft:#7A8AA0;
    --line:#E7ECF5; --bg:#F6F8FC; --white:#fff;
    --green:#059669; --radius:16px;
    --font:'Plus Jakarta Sans',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--white);-webkit-font-smoothing:antialiased;line-height:1.6}
a{color:inherit;text-decoration:none}
img,svg{display:block}
.bt-i{color:var(--blue2)}

/* Boutons */
.bt-btn-primary{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,var(--blue1),var(--blue2));color:#fff;font-weight:700;font-size:14px;padding:11px 18px;border-radius:13px;border:none;cursor:pointer;transition:transform .15s ease,box-shadow .2s ease;box-shadow:0 8px 22px rgba(37,99,235,.28)}
.bt-btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(37,99,235,.36)}
.bt-btn-ghost{display:inline-flex;align-items:center;gap:8px;background:#fff;color:var(--blue2);font-weight:700;font-size:14px;padding:10px 16px;border-radius:13px;border:1.5px solid #DCE5F5;cursor:pointer;transition:background .15s ease,border-color .15s ease}
.bt-btn-ghost:hover{background:#F3F7FF;border-color:#C5D5F2}
.bt-btn-white{display:inline-flex;align-items:center;gap:8px;background:#fff;color:var(--blue2);font-weight:800;font-size:15px;padding:13px 24px;border-radius:14px;transition:transform .15s ease}
.bt-btn-white:hover{transform:translateY(-2px)}
.bt-btn-primary.lg,.bt-btn-ghost.lg{font-size:15px;padding:14px 24px;border-radius:14px}

/* Nav */
.bt-nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:16px 40px;transition:background .25s ease,box-shadow .25s ease,padding .25s ease}
.bt-nav.scrolled{background:rgba(255,255,255,.86);backdrop-filter:blur(14px);box-shadow:0 1px 0 var(--line);padding:11px 40px}
.bt-nav-brand{display:flex;align-items:center;gap:10px}
.bt-nav-mark{width:36px;height:36px}
.bt-nav-word{font-weight:800;font-size:23px;letter-spacing:-.5px}
.bt-nav-links{display:flex;gap:26px}
.bt-nav-links a{font-weight:600;font-size:14px;color:var(--muted);transition:color .15s ease}
.bt-nav-links a:hover{color:var(--ink)}
.bt-nav-cta{display:flex;align-items:center;gap:10px}
@media(max-width:860px){.bt-nav{padding:14px 20px}.bt-nav.scrolled{padding:10px 20px}.bt-nav-links{display:none}}
@media(max-width:560px){.bt-nav-word{display:none}}

/* Footer */
.bt-foot{background:#0E1830;color:#C7D2E4;padding:56px 40px 28px;margin-top:0}
.bt-foot-grid{max-width:1100px;margin:0 auto;display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px}
.bt-foot-logo{display:flex;align-items:center;gap:10px}
.bt-foot-logo svg{width:34px;height:34px}
.bt-foot-word{font-weight:800;font-size:21px;color:#fff}
.bt-foot-word .bt-i{color:#6E9BFF}
.bt-foot-tag{color:#8FA0BC;font-size:14px;margin-top:12px;max-width:260px}
.bt-foot-col h4{font-size:13px;font-weight:700;color:#fff;margin-bottom:14px;text-transform:uppercase;letter-spacing:.05em}
.bt-foot-col a{display:block;font-size:14px;color:#9FB0CC;margin-bottom:10px;transition:color .15s ease}
.bt-foot-col a:hover{color:#fff}
.bt-foot-disclaimer{max-width:1100px;margin:40px auto 0;padding-top:22px;border-top:1px solid rgba(255,255,255,.09);font-size:12px;line-height:1.65;color:#7E8FAC}
.bt-foot-disclaimer strong{color:#AEBDD6}
.bt-foot-bottom{max-width:1100px;margin:18px auto 0;display:flex;justify-content:space-between;font-size:12.5px;color:#7E8FAC;flex-wrap:wrap;gap:8px}
@media(max-width:860px){.bt-foot-grid{grid-template-columns:1fr 1fr}.bt-foot{padding:44px 20px 24px}}

/* Reveal (scroll) */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}