:root{--bg:#0A0F1E;--gold:#FACC15;--card:rgba(255,255,255,.06);--line:rgba(255,255,255,.12);--txt:#fff;--mut:#aab3cc}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--txt);font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;line-height:1.5;overflow-x:hidden}
a{color:inherit}

/* Fond animé */
.bg{position:fixed;inset:0;z-index:-1;overflow:hidden;background:linear-gradient(135deg,#0A0F1E,#101a3a,#0A0F1E);background-size:300% 300%;animation:grad 18s ease infinite}
.blob{position:absolute;border-radius:50%;filter:blur(70px);opacity:.35;animation:drift 22s ease-in-out infinite}
.b1{width:380px;height:380px;background:#1d4ed8;top:-80px;left:-80px}
.b2{width:320px;height:320px;background:#FACC15;opacity:.14;bottom:10%;right:-60px;animation-delay:-7s}
.b3{width:300px;height:300px;background:#7c3aed;top:45%;left:30%;opacity:.2;animation-delay:-13s}
.grid{position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:56px 56px;opacity:.18;mask-image:radial-gradient(circle at 50% 30%,#000,transparent 75%)}
@keyframes grad{0%,100%{background-position:0 50%}50%{background-position:100% 50%}}
@keyframes drift{0%,100%{transform:translate(0,0)}50%{transform:translate(60px,40px)}}

#confetti{position:fixed;inset:0;pointer-events:none;z-index:50}

/* Header */
.header{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;padding:12px 20px;background:rgba(10,15,30,.75);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.5px}
.logo b{color:var(--gold)}
.logo-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--gold);color:#0A0F1E;font-weight:900}

/* Boutons */
.btn{display:inline-block;border:0;cursor:pointer;text-decoration:none;font-weight:800;font-size:1rem;padding:14px 26px;border-radius:12px;transition:transform .2s,box-shadow .2s;position:relative;overflow:hidden;font-family:inherit}
.btn:hover{transform:translateY(-3px)}
.btn-gold{background:var(--gold);color:#0A0F1E;box-shadow:0 8px 24px rgba(250,204,21,.25)}
.btn-gold:hover{box-shadow:0 12px 32px rgba(250,204,21,.45)}
.btn-ghost{background:transparent;color:#fff;border:1px solid var(--line)}
.btn-ghost:hover{background:var(--card)}
.btn-sm{padding:9px 16px;font-size:.9rem}
.shine::after{content:"";position:absolute;top:0;left:-80%;width:50%;height:100%;background:linear-gradient(100deg,transparent,rgba(255,255,255,.65),transparent);transform:skewX(-20deg);animation:shine 3.2s infinite}
@keyframes shine{0%{left:-80%}60%,100%{left:140%}}

/* Hero */
.hero{position:relative;text-align:center;padding:90px 20px 70px;max-width:900px;margin:0 auto}
.badge{display:inline-block;padding:8px 16px;border:1px solid rgba(250,204,21,.5);border-radius:99px;color:var(--gold);font-weight:700;margin-bottom:22px;background:rgba(250,204,21,.08)}
h1{font-size:clamp(2rem,5.5vw,3.6rem);line-height:1.1;font-weight:900;margin-bottom:16px}
.gold{color:var(--gold)}
.sub{font-size:1.25rem;color:var(--mut);margin-bottom:30px}
.sub b{color:#fff}
.cta{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.floaters .card{position:absolute;padding:10px 16px;background:var(--card);border:1px solid var(--line);border-radius:14px;backdrop-filter:blur(8px);font-size:.9rem;animation:float 6s ease-in-out infinite}
.f1{top:20px;left:2%}.f2{top:70px;right:2%;animation-delay:-2s}.f3{bottom:10px;left:8%;animation-delay:-4s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-16px)}}

/* Reveal au scroll */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s,transform .8s}
.reveal.in{opacity:1;transform:none}
.engine.reveal:nth-child(2){transition-delay:.12s}.engine.reveal:nth-child(3){transition-delay:.24s}.engine.reveal:nth-child(4){transition-delay:.36s}
.steps li.reveal:nth-child(2){transition-delay:.15s}.steps li.reveal:nth-child(3){transition-delay:.3s}

/* Code */
.unlock{padding:30px 20px 60px;max-width:760px;margin:0 auto;scroll-margin-top:70px}
.unlock-box{text-align:center;padding:36px 24px;background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:0 0 60px rgba(250,204,21,.08);animation:pulse 4s ease-in-out infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 40px rgba(250,204,21,.06)}50%{box-shadow:0 0 70px rgba(250,204,21,.2)}}
.unlock-box h2{margin:10px 0 20px;font-size:1.5rem}
.lock svg{display:block;margin:0 auto}
.shackle{transform-origin:44px 28px;transition:transform .7s cubic-bezier(.3,1.6,.5,1)}
.lock.open .shackle{transform:translateY(-9px) rotate(-30deg)}
#codeForm{display:flex;flex-direction:column;gap:14px;max-width:460px;margin:0 auto}
#codeInput{width:100%;padding:18px;font-size:1.25rem;text-align:center;letter-spacing:2px;border-radius:12px;border:2px solid var(--line);background:rgba(0,0,0,.35);color:#fff;outline:none;transition:border-color .2s,box-shadow .2s;font-family:ui-monospace,Menlo,monospace}
#codeInput:focus{border-color:var(--gold);box-shadow:0 0 0 4px rgba(250,204,21,.18)}
.msg{min-height:1.5em;margin-top:14px;font-weight:700}
.msg.err{color:#ff5d5d;animation:shake .45s}
@keyframes shake{20%,60%{transform:translateX(-8px)}40%,80%{transform:translateX(8px)}}
.nocode{display:inline-block;margin-top:14px;color:var(--mut);font-size:.95rem}
.nocode:hover{color:var(--gold)}

.prompt-zone{margin-top:26px;animation:unlockIn .8s cubic-bezier(.2,.8,.2,1)}
@keyframes unlockIn{from{opacity:0;transform:translateY(30px) scale(.97)}to{opacity:1;transform:none}}
.prompt-zone[hidden]{display:none}
.ok{color:#4ade80;font-weight:800;font-size:1.15rem;text-align:center}
.used{text-align:center;color:var(--mut);margin:6px 0 16px;font-size:.95rem}
.prompt-wrap{position:relative;margin-bottom:16px}
#promptArea{width:100%;height:340px;resize:vertical;padding:18px;border-radius:14px;border:1px solid var(--line);background:rgba(0,0,0,.45);color:#e6ebff;font:13px/1.55 ui-monospace,Menlo,monospace}
.watermark{position:absolute;inset:0;pointer-events:none;border-radius:14px;opacity:.1}
#btnCopy{display:block;margin:0 auto 18px}
.warn{margin-top:10px;padding:12px 14px;border-radius:10px;background:rgba(250,204,21,.09);border:1px solid rgba(250,204,21,.35);font-size:.92rem}
.warn.small{font-size:.8rem;color:var(--mut);background:transparent;border-color:var(--line)}
.warn[hidden]{display:none}

/* Sections */
section h2{text-align:center;font-size:clamp(1.5rem,3.5vw,2.2rem);margin-bottom:30px}
.engines,.example,.how{max-width:1000px;margin:0 auto;padding:50px 20px}
.engine-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:18px}
.engine{padding:24px;border-radius:18px;background:var(--card);border:1px solid var(--line);text-align:center;transition:transform .3s,border-color .3s}
.engine:hover{transform:translateY(-6px);border-color:var(--c)}
.elogo{width:64px;height:64px;margin:0 auto 14px;display:grid;place-items:center;border-radius:16px;background:var(--c);font-size:2rem;font-weight:900;color:#fff;box-shadow:0 8px 24px color-mix(in srgb,var(--c) 45%,transparent)}
.engine h3{margin-bottom:6px}.engine p{color:var(--mut);font-size:.92rem}
.tiny{margin-top:16px;text-align:center;font-size:.78rem;color:var(--mut)}
.example-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px}
figure{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:14px;text-align:center}
figcaption{margin-top:10px;color:var(--mut);font-size:.9rem}
.plan{width:100%;height:auto;border-radius:10px;display:block}
.cad{max-height:360px}
.revit3{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.revit3 .rv:nth-child(3){grid-column:1/-1}
.steps{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin-bottom:30px}
.steps li{padding:24px;border-radius:18px;background:var(--card);border:1px solid var(--line);text-align:center}
.steps p{color:var(--mut);font-size:.92rem;margin-top:6px}
.n{display:grid;place-items:center;width:44px;height:44px;margin:0 auto 12px;border-radius:50%;background:var(--gold);color:#0A0F1E;font-weight:900}
.footer{text-align:center;padding:30px 20px;color:var(--mut);font-size:.85rem;border-top:1px solid var(--line)}

.paid{font-size:clamp(1.25rem,3.2vw,1.8rem);font-weight:800;line-height:1.35;margin-bottom:28px}
.smallpay{font-size:.8rem;margin-bottom:10px}

@media (max-width:640px){.floaters{display:none}.hero{padding-top:60px}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}}