/* ===== Pianovera, identité propre : sombre élégant, bleu vers cyan, notes qui tombent ===== */
:root{
  --bg:#070b14; --bg2:#0b1120; --panel:#0f1830; --panel2:#131f3d;
  --line:rgba(120,150,220,.14); --line2:rgba(120,150,220,.22);
  --txt:#eaf0ff; --mut:#9aabd0; --mut2:#6f80a6;
  --blue:#4f7cff; --blue2:#3b6ef6; --cyan:#22d3ee; --green:#34d399;
  --grad:linear-gradient(120deg,var(--blue),var(--cyan));
  --grad-soft:linear-gradient(120deg,rgba(79,124,255,.16),rgba(34,211,238,.12));
  --r:18px; --rs:12px; --max:1160px;
  --shadow:0 30px 80px -30px rgba(0,10,40,.8);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--txt);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3{line-height:1.1;letter-spacing:-.02em;margin:0}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.wrap.narrow{max-width:820px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.kicker{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:var(--cyan);background:var(--grad-soft);border:1px solid var(--line2);padding:5px 12px;border-radius:999px;margin-bottom:16px}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;color:var(--mut);letter-spacing:.04em;
  border:1px solid var(--line);border-radius:999px;padding:6px 14px;margin-bottom:22px;background:rgba(255,255,255,.02)}

/* fond : grille + halo */
.bg-grid{position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
   radial-gradient(1100px 600px at 78% -8%,rgba(34,211,238,.14),transparent 60%),
   radial-gradient(900px 600px at 8% 4%,rgba(79,124,255,.16),transparent 55%),
   linear-gradient(180deg,var(--bg),var(--bg));
}
.bg-grid::after{content:"";position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(rgba(120,150,220,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(120,150,220,.05) 1px,transparent 1px);
  background-size:56px 56px;mask-image:radial-gradient(circle at 50% 0,#000,transparent 70%)}

/* ===== boutons ===== */
.btn{display:inline-flex;align-items:center;gap:9px;font-weight:700;font-size:15px;cursor:pointer;
  padding:12px 20px;border-radius:12px;border:1px solid var(--line2);color:var(--txt);
  transition:.16s ease;white-space:nowrap;background:rgba(255,255,255,.03)}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--grad);border-color:transparent;color:#04122b;
  box-shadow:0 12px 30px -8px rgba(51,120,246,.6)}
.btn-primary:hover{filter:brightness(1.07);box-shadow:0 18px 40px -8px rgba(51,120,246,.7)}
.btn-ghost:hover{border-color:var(--blue);background:rgba(79,124,255,.12)}
.btn-lg{padding:15px 26px;font-size:16px;border-radius:14px}
.btn-block{display:flex;justify-content:center;width:100%}

/* ===== nav ===== */
.nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:26px;
  padding:14px 24px;max-width:var(--max);margin:0 auto;transition:.2s}
.nav.scrolled{background:rgba(9,13,24,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);
  border-radius:0 0 16px 16px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:19px;letter-spacing:-.01em}
.brand-mark{width:26px;height:26px;border-radius:8px;background:var(--grad);position:relative;box-shadow:0 0 22px rgba(34,211,238,.5)}
.brand-mark::before{content:"";position:absolute;left:6px;bottom:5px;width:3px;height:11px;border-radius:2px;background:#04122b;box-shadow:5px 0 #04122b,10px 0 #04122b}
.nav-links{display:flex;gap:6px;margin-left:8px}
.nav-links a{color:var(--mut);font-weight:600;font-size:14.5px;padding:8px 12px;border-radius:9px;transition:.14s}
.nav-links a:hover{color:var(--txt);background:rgba(255,255,255,.05)}
.lang{display:flex;gap:2px;margin-left:auto;border:1px solid var(--line2);border-radius:9px;padding:2px}
.lang a{font-size:12.5px;font-weight:700;color:var(--mut);padding:5px 10px;border-radius:7px;line-height:1}
.lang a.on{background:var(--grad);color:#04122b}
.lang a:not(.on):hover{color:var(--txt);background:rgba(255,255,255,.05)}
.nav-cta{margin-left:10px}
.nav-burger{display:none;margin-left:10px;background:none;border:0;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-burger span{width:24px;height:2px;background:var(--txt);border-radius:2px;transition:.2s}

/* ===== hero ===== */
.hero{position:relative;padding:52px 24px 70px;overflow:hidden}
.hero-inner{max-width:var(--max);margin:0 auto;display:grid;grid-template-columns:1.02fr 1.1fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(38px,5.6vw,64px);font-weight:800;margin-bottom:20px}
.lead{font-size:clamp(16px,1.7vw,20px);color:var(--mut);max-width:34ch;margin:0 0 30px}
.lead b{color:var(--txt)}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:26px}
.hero-badges{display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--mut);font-size:13.5px;font-weight:600}
.hero-badges span{white-space:nowrap}
/* fenêtre app */
.window{border:1px solid var(--line2);border-radius:16px;overflow:hidden;background:#0a0f1c;box-shadow:var(--shadow)}
.window-bar{display:flex;gap:7px;padding:11px 14px;background:#0d1424;border-bottom:1px solid var(--line)}
.window-bar i{width:11px;height:11px;border-radius:50%;background:#2a3556}
.window img{width:100%;height:auto;display:block}
.hero-shot{position:relative}
.hero-shot .window{transform:perspective(1600px) rotateY(-7deg) rotateX(2.5deg)}
/* notes qui tombent (déco hero) */
.falls{position:absolute;inset:0;z-index:-1;pointer-events:none;overflow:hidden;opacity:.5}
.falls span{position:absolute;top:-16%;width:12px;border-radius:6px;animation:fall linear infinite}
@keyframes fall{0%{transform:translateY(-20vh)}100%{transform:translateY(120vh)}}

/* ===== sections ===== */
.section{padding:84px 0;position:relative}
.section.alt{background:linear-gradient(180deg,transparent,var(--bg2) 12%,var(--bg2) 88%,transparent)}
.section-head{text-align:center;max-width:680px;margin:0 auto 46px}
.section-head h2,.section h2{font-size:clamp(27px,3.4vw,40px);font-weight:800}
.section-head .sub,.sub{color:var(--mut);font-size:17px;margin-top:14px}
.grid{display:grid;gap:18px}
.features{grid-template-columns:repeat(3,1fr)}
.card{background:linear-gradient(180deg,var(--panel),var(--bg2));border:1px solid var(--line);
  border-radius:var(--r);padding:26px 24px;transition:.2s}
.card:hover{border-color:var(--line2);transform:translateY(-4px);box-shadow:var(--shadow)}
.card h3{font-size:19px;margin:16px 0 9px}
.card p{color:var(--mut);font-size:15px;margin:0}
.card p b,.ticks b{color:var(--txt)}
/* icônes */
.ic{width:46px;height:46px;border-radius:13px;background:var(--grad-soft);border:1px solid var(--line2);
  position:relative;display:grid;place-items:center}
.ic::before{content:"";font-size:0}
.ic-notes::before{content:"🎹";font-size:22px}
.ic-learn::before{content:"🎓";font-size:22px}
.ic-studio::before{content:"🎬";font-size:22px}
.ic-piano::before{content:"🎵";font-size:22px}
.ic-midi::before{content:"⌨️";font-size:22px}
.ic-progress::before{content:"📈";font-size:22px}

/* étapes */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:18px;counter-reset:s}
.steps li{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:26px 24px;position:relative}
.step-n{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--grad);
  color:#04122b;font-weight:800;font-size:18px;margin-bottom:16px}
.steps h3{font-size:18px;margin-bottom:8px}
.steps p{color:var(--mut);font-size:15px;margin:0}

/* split (apprendre / studio) */
.split-in{display:grid;grid-template-columns:1fr 1.14fr;gap:52px;align-items:center}
.split-in.reverse .split-copy{order:2}
.split-copy h2{margin-bottom:16px}
.split-copy p{color:var(--mut);font-size:17px}
.ticks{list-style:none;margin:22px 0 0;padding:0;display:grid;gap:11px}
.ticks li{position:relative;padding-left:30px;color:var(--txt);font-size:15.5px}
.ticks li::before{content:"";position:absolute;left:0;top:6px;width:18px;height:18px;border-radius:50%;
  background:var(--grad);mask:no-repeat center/12px url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23000' d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/%3E%3C/svg%3E")}
.split-shot .window{transform:perspective(1600px) rotateY(6deg)}
.split-in.reverse .split-shot .window{transform:perspective(1600px) rotateY(-6deg)}

/* son */
.son{text-align:center}
.son .keys{display:flex;justify-content:center;gap:3px;margin-top:36px;height:120px;align-items:flex-end}
.son .keys span{width:34px;height:118px;background:linear-gradient(#f4f7ff,#cdd8ee);border-radius:0 0 5px 5px;
  box-shadow:inset 0 -6px 0 rgba(0,0,0,.08)}
.son .keys span.b{width:20px;height:74px;margin:0 -13px;z-index:2;background:linear-gradient(#2a3350,#0c1122);border-radius:0 0 4px 4px}
.son .keys span:nth-child(3n){box-shadow:inset 0 -6px 0 rgba(0,0,0,.08),0 0 26px rgba(34,211,238,.5)}

/* tarifs */
.plans{grid-template-columns:repeat(3,1fr);align-items:start}
.plan{background:linear-gradient(180deg,var(--panel),var(--bg2));border:1px solid var(--line);border-radius:var(--r);padding:28px 24px;position:relative}
.plan.featured{border-color:transparent;background:linear-gradient(180deg,var(--panel2),var(--bg2));
  box-shadow:0 0 0 1.5px var(--blue2),var(--shadow);transform:translateY(-6px)}
.plan .tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--grad);color:#04122b;
  font-weight:800;font-size:12px;padding:5px 14px;border-radius:999px;letter-spacing:.02em;white-space:nowrap}
.plan h3{font-size:20px;margin-bottom:6px}
.price{font-size:28px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.plan-sub{color:var(--mut);font-size:14px;margin:2px 0 16px}
.plan .ticks{margin:0 0 22px}
.plan .ticks li{font-size:14.5px}
.plan-note{color:var(--mut2);font-size:12.5px;text-align:center;margin:12px 0 0}

/* download */
.download{text-align:center}
.download .wrap{background:radial-gradient(700px 300px at 50% 0,rgba(34,211,238,.14),transparent 70%)}
.dl-actions{display:flex;gap:16px;align-items:center;justify-content:center;flex-wrap:wrap;margin:26px 0 12px}
.dl-soon{color:var(--mut);font-size:14px;font-weight:600;border:1px dashed var(--line2);padding:10px 16px;border-radius:12px}
.dl-fine{color:var(--mut2);font-size:13.5px}

/* faq */
.faq{display:grid;gap:12px}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:var(--rs);padding:4px 20px;transition:.2s}
.faq details[open]{border-color:var(--line2);background:var(--panel2)}
.faq summary{cursor:pointer;list-style:none;font-weight:700;font-size:16px;padding:16px 0;position:relative;padding-right:34px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:2px;top:12px;font-size:24px;font-weight:400;color:var(--cyan);transition:.2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{color:var(--mut);margin:0 0 16px;font-size:15px}

/* footer */
.foot{border-top:1px solid var(--line);padding:44px 0;margin-top:20px;background:var(--bg2)}
.foot-in{display:grid;grid-template-columns:1fr auto 1fr;gap:26px;align-items:center}
.foot-brand{display:flex;align-items:center;gap:12px}
.foot-brand small{color:var(--mut)}
.foot-links{display:flex;gap:8px 16px;justify-content:center;flex-wrap:wrap}
.foot-links a{color:var(--mut);font-size:14px}.foot-links a:hover{color:var(--txt)}
.foot-credit{color:var(--mut2);font-size:12.5px;text-align:right;margin:0;line-height:1.7}
code{background:rgba(120,150,220,.12);border:1px solid var(--line);border-radius:6px;padding:1px 6px;font-size:.9em}

/* reveal on scroll : amélioration progressive, visible par défaut, masqué seulement si JS actif */
.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.js .reveal.in{opacity:1;transform:none}

/* ===== responsive ===== */
@media(max-width:920px){
  .hero-inner{grid-template-columns:1fr;gap:36px}
  .hero-shot .window{transform:none}
  .features{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
  .split-in{grid-template-columns:1fr;gap:30px}
  .split-in.reverse .split-copy{order:0}
  .split-shot .window,.split-in.reverse .split-shot .window{transform:none}
  .plans{grid-template-columns:1fr;max-width:440px;margin:0 auto}
  .plan.featured{transform:none}
  .foot-in{grid-template-columns:1fr;text-align:center;gap:18px}
  .foot-brand{justify-content:center}.foot-credit{text-align:center}
}
@media(max-width:640px){
  .nav-links,.nav-cta{display:none}
  .nav-burger{display:flex}
  .nav.open .nav-links{display:flex;position:absolute;top:64px;left:12px;right:12px;flex-direction:column;
    background:rgba(11,17,32,.97);backdrop-filter:blur(14px);border:1px solid var(--line2);border-radius:14px;padding:10px}
  .nav.open .nav-links a{padding:12px}
  .features{grid-template-columns:1fr}
  .section{padding:60px 0}
  .hero{padding:32px 20px 50px}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;scroll-behavior:auto}
  .reveal,.js .reveal{opacity:1!important;transform:none!important}
}