:root{
  --ink:#060b12; --panel:#0a1420; --panel-2:#0c1a28; --line:rgba(83,201,221,.16);
  --teal:#35c9dd; --teal-deep:#1a8fa3; --teal-dim:#2a97ab;
  --fg:#e9f2f5; --fg-mut:#8ba1ac; --fg-soft:#c4d4da;
  --glow:0 0 40px rgba(53,201,221,.25);
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--ink); color:var(--fg);
  font-family:'Manrope',system-ui,sans-serif; font-weight:400;
  line-height:1.6; -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{ /* ambient depth */
  content:""; position:fixed; inset:0; z-index:0; pointer-events:none;
  background:
    radial-gradient(1100px 600px at 82% -5%, rgba(53,201,221,.10), transparent 60%),
    radial-gradient(900px 700px at -10% 20%, rgba(26,143,163,.08), transparent 55%);
}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;position:relative;z-index:1}
h1,h2,h3,.display{font-family:'Jost',sans-serif;font-weight:300;letter-spacing:.02em}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ---------- HEADER ---------- */
header{position:sticky;top:0;z-index:50;transition:background .3s,border-color .3s;
  border-bottom:1px solid transparent;backdrop-filter:blur(0px)}
header.scrolled{background:rgba(6,11,18,.82);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:40px;height:78px}
.brand{display:flex;align-items:center;line-height:1}
.brand img{height:46px;width:auto;display:block}
.brand .b1{background:#fff;color:#0a1420;font-weight:800;font-family:'Manrope';font-size:13px;
  letter-spacing:.02em;padding:3px 10px 4px;border-radius:10px 10px 10px 3px;width:max-content}
.brand .b2{background:var(--teal);color:#04222a;font-weight:800;font-family:'Manrope';font-size:13px;
  letter-spacing:.02em;padding:3px 10px 4px;border-radius:3px 10px 10px 10px;width:max-content;margin-left:14px}
nav .links{display:flex;gap:54px;margin-left:auto;font-size:12px;color:var(--fg-soft);font-weight:600;letter-spacing:.13em;text-transform:uppercase}
nav .links a{position:relative;padding:6px 0;transition:color .2s;white-space:nowrap}
nav .links a:hover{color:var(--teal)}
nav .links a::after{content:"";position:absolute;left:0;bottom:-2px;height:1px;width:0;background:var(--teal);transition:width .25s}
nav .links a:hover::after{width:100%}
.lang{display:flex;gap:2px;border:1px solid var(--line);border-radius:999px;padding:3px;font-size:12px;font-weight:600}
.lang button{background:none;border:none;color:var(--fg-mut);padding:4px 11px;border-radius:999px;cursor:pointer;font-family:inherit;font-weight:600;letter-spacing:.04em;transition:.2s}
.lang button.active{background:var(--teal);color:#04222a}
.cta{display:inline-flex;align-items:center;gap:9px;background:var(--teal);color:#04222a;
  font-weight:700;font-size:14px;padding:11px 20px;border-radius:999px;border:none;cursor:pointer;
  font-family:'Manrope';transition:transform .2s,box-shadow .2s,background .2s}
.cta:hover{transform:translateY(-2px);box-shadow:var(--glow);background:#4bd6e8}
.cta.ghost{background:transparent;color:var(--fg);border:1px solid var(--line)}
.cta.ghost:hover{border-color:var(--teal);color:var(--teal);box-shadow:none}
.burger{display:none;background:none;border:none;color:var(--fg);cursor:pointer;margin-left:auto}

/* ---------- HERO ---------- */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0;background-size:cover;background-position:center right;
  background-image:linear-gradient(90deg,rgba(6,11,18,.97) 0%,rgba(6,11,18,.85) 30%,rgba(6,11,18,.35) 62%,rgba(6,11,18,.12) 100%), url('/img/hero.jpg')}
.hero-scan{position:absolute;inset:0;z-index:1;pointer-events:none;mix-blend-mode:screen;opacity:.5;
  background:repeating-linear-gradient(0deg,transparent 0 3px,rgba(53,201,221,.035) 3px 4px)}
.hero .wrap{padding-top:60px;padding-bottom:60px}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:'Manrope';font-weight:600;
  font-size:12.5px;letter-spacing:.28em;text-transform:uppercase;color:var(--teal);margin-bottom:26px}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--teal)}
.hero h1{font-size:clamp(46px,8vw,104px);line-height:.98;font-weight:200;letter-spacing:.06em}
.hero h1 .yr{color:var(--teal);font-weight:300}
.hero .tag{font-family:'Jost';font-weight:300;font-size:clamp(18px,2.6vw,28px);color:var(--fg-soft);
  letter-spacing:.04em;margin-top:18px}
.hero .meta{display:flex;flex-wrap:wrap;gap:14px;margin:34px 0 36px}
.chip{display:inline-flex;align-items:center;gap:9px;border:1px solid var(--line);background:rgba(10,20,32,.5);
  padding:10px 16px;border-radius:999px;font-size:13.5px;font-weight:500;color:var(--fg-soft)}
.chip svg{color:var(--teal)}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.countdown{display:flex;gap:22px;margin-top:44px}
.cd-item{text-align:center}
.cd-item b{font-family:'Jost';font-weight:300;font-size:34px;color:var(--fg);display:block;line-height:1}
.cd-item span{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--fg-mut)}

/* ---------- SECTION SHELL ---------- */
section.blk{padding:96px 0;position:relative}
.sec-head{max-width:720px;margin-bottom:52px}
.sec-eyebrow{font-family:'Manrope';font-weight:600;font-size:12px;letter-spacing:.26em;
  text-transform:uppercase;color:var(--teal);margin-bottom:16px;display:flex;align-items:center;gap:12px}
.sec-eyebrow::before{content:"";width:26px;height:1px;background:var(--teal-deep)}
.sec-head h2{font-size:clamp(30px,4.4vw,50px);font-weight:200;line-height:1.05;letter-spacing:.03em}
.sec-head p{color:var(--fg-mut);font-size:17px;margin-top:18px;max-width:640px}
.divider-glitch{height:1px;width:100%;background:
  repeating-linear-gradient(90deg,var(--line) 0 40px,transparent 40px 46px,var(--teal-deep) 46px 58px,transparent 58px 66px);opacity:.5}

/* intro band */
.intro{padding:70px 0}
.intro .big{font-family:'Jost';font-weight:200;font-size:clamp(26px,4vw,44px);line-height:1.22;letter-spacing:.02em}
.intro .big em{font-style:normal;color:var(--teal)}

/* concept 2-up */
.two{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.ccard{position:relative;border:1px solid var(--line);border-radius:18px;padding:38px 34px;
  background:linear-gradient(180deg,var(--panel) 0%,rgba(10,20,32,.35) 100%);overflow:hidden;transition:transform .3s,border-color .3s}
.ccard:hover{transform:translateY(-4px);border-color:rgba(53,201,221,.4)}
.ccard .tnum{font-family:'Jost';font-weight:200;font-size:15px;letter-spacing:.3em;color:var(--teal);text-transform:uppercase}
.ccard h3{font-size:28px;font-weight:300;margin:14px 0 8px;letter-spacing:.03em}
.ccard .when{font-size:13px;color:var(--fg-mut);letter-spacing:.05em;margin-bottom:18px}
.ccard p{color:var(--fg-soft);font-size:15.5px}
.ccard .focus{margin-top:20px;display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:600;
  color:var(--teal);border:1px solid var(--line);padding:7px 14px;border-radius:999px}
.ccard::after{content:"";position:absolute;right:-40px;top:-40px;width:160px;height:160px;border-radius:50%;
  background:radial-gradient(circle,rgba(53,201,221,.14),transparent 70%);pointer-events:none}

/* awards */
.awards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.award{border:1px solid var(--line);border-radius:16px;padding:32px 26px;background:var(--panel-2);
  transition:transform .3s,box-shadow .3s,border-color .3s;position:relative}
.award:hover{transform:translateY(-5px);box-shadow:var(--glow);border-color:rgba(53,201,221,.4)}
.award .ic{width:46px;height:46px;border-radius:12px;border:1px solid var(--line);display:grid;place-items:center;
  color:var(--teal);margin-bottom:20px;background:rgba(53,201,221,.06)}
.award-for{font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--teal);font-weight:700;margin-bottom:10px}
.award h3{font-size:21px;font-weight:400;letter-spacing:.02em;margin-bottom:10px}
.award p{font-size:14.5px;color:var(--fg-mut)}

/* programme timeline */
.timeline{max-width:760px}
.tl{display:grid;grid-template-columns:104px 1fr;gap:0;position:relative}
.tl-row{display:contents}
.tl-time{font-family:'Jost';font-weight:300;font-size:19px;color:var(--teal);padding:16px 0}
.tl-body{border-left:1px solid var(--line);padding:16px 0 16px 28px;position:relative}
.tl-body::before{content:"";position:absolute;left:-5px;top:23px;width:9px;height:9px;border-radius:50%;
  background:var(--ink);border:2px solid var(--teal)}
.tl-body h4{font-size:16.5px;font-weight:600;font-family:'Manrope';letter-spacing:.01em}
.tl-body span{font-size:13.5px;color:var(--fg-mut)}
.tl-row.hl .tl-body::before{background:var(--teal);box-shadow:0 0 12px var(--teal)}

/* speakers / provisional */
.notice{border:1px dashed rgba(53,201,221,.35);border-radius:14px;padding:26px 28px;background:rgba(53,201,221,.04);
  display:flex;gap:18px;align-items:flex-start}
.notice svg{color:var(--teal);flex:none;margin-top:2px}
.notice h4{font-family:'Jost';font-weight:300;font-size:22px;letter-spacing:.03em;margin-bottom:6px}
.notice p{color:var(--fg-mut);font-size:15px}
.spk-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:30px}
.spk{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--panel)}
.spk .ph{aspect-ratio:1;background:
  linear-gradient(135deg,#0c1a28,#0a1420);display:grid;place-items:center;color:rgba(139,161,172,.4)}
.spk .in{padding:16px 18px}
.spk .in b{font-weight:600;font-size:15px;display:block}
.spk .in span{font-size:12.5px;color:var(--fg-mut)}
.tbc{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--teal-dim)}

/* benefits */
.bene{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.b{border-top:1px solid var(--line);padding-top:22px}
.b .n{font-family:'Jost';font-weight:200;font-size:30px;color:var(--teal-dim);letter-spacing:.06em}
.b h4{font-size:16px;font-weight:600;font-family:'Manrope';margin:12px 0 8px}
.b p{font-size:13.5px;color:var(--fg-mut)}

/* gallery */
.gal{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:150px;gap:12px}
.gal .g{border-radius:12px;background:linear-gradient(135deg,#0c1a28,#0a1420);border:1px solid var(--line);
  display:grid;place-items:center;color:rgba(139,161,172,.35);font-size:12px;letter-spacing:.12em;position:relative;overflow:hidden}
.gal .g.tall{grid-row:span 2}
.gal .g::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(0deg,transparent 0 6px,rgba(53,201,221,.03) 6px 7px);opacity:.6}

/* sponsors */
.spon-row{display:flex;flex-wrap:wrap;gap:20px;align-items:stretch}
.spon{flex:1;min-width:220px;border:1px solid var(--line);border-radius:16px;background:var(--panel);
  padding:34px;display:flex;flex-direction:column;gap:8px;align-items:center;justify-content:center;text-align:center}
.spon .logo{height:44px;display:grid;place-items:center;font-family:'Jost';font-weight:300;font-size:26px;letter-spacing:.14em;color:var(--fg)}
.spon small{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--fg-mut)}
.spon.partner{background:linear-gradient(180deg,rgba(53,201,221,.06),transparent);border-color:rgba(53,201,221,.3)}
.becomes{border:1px dashed var(--line);border-radius:16px;padding:34px;flex:1;min-width:220px;display:flex;
  flex-direction:column;gap:14px;align-items:center;justify-content:center;text-align:center;color:var(--fg-mut)}

/* ---------- REGISTRATION ---------- */
.reg{background:linear-gradient(180deg,rgba(10,20,32,.6),rgba(6,11,18,.2));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.reg-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:start}
.modules{display:flex;flex-direction:column;gap:14px}
.mod{display:flex;gap:16px;align-items:flex-start;border:1px solid var(--line);border-radius:14px;padding:20px 22px;
  cursor:pointer;transition:border-color .2s,background .2s;background:var(--panel)}
.mod:hover{border-color:rgba(53,201,221,.4)}
.mod.on{border-color:var(--teal);background:rgba(53,201,221,.06)}
.mod .box{width:22px;height:22px;border-radius:6px;border:1.5px solid var(--fg-mut);flex:none;margin-top:3px;
  display:grid;place-items:center;transition:.2s}
.mod.on .box{background:var(--teal);border-color:var(--teal)}
.mod .box svg{opacity:0;transition:.2s;color:#04222a}
.mod.on .box svg{opacity:1}
.mod .mt b{font-size:16px;font-weight:600;display:block;margin-bottom:6px}
.mod .mt .h{display:block;font-size:12px;color:var(--teal-dim);letter-spacing:.05em;margin-bottom:9px}
.mod .mt span{font-size:13px;color:var(--fg-mut);display:block}
.form{display:flex;flex-direction:column;gap:14px}
.field label{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--fg-mut);display:block;margin-bottom:7px}
.field input,.field select,.field textarea{width:100%;background:var(--panel);border:1px solid var(--line);
  border-radius:10px;padding:12px 14px;color:var(--fg);font-family:'Manrope';font-size:14.5px;transition:border-color .2s}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--teal)}
.field.two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field.two-col > div{min-width:0}
.summary{border:1px solid var(--line);border-radius:16px;padding:26px;background:var(--panel);position:sticky;top:96px}
.summary h3{font-family:'Jost';font-weight:300;font-size:22px;letter-spacing:.03em;margin-bottom:18px}
.sum-line{display:flex;justify-content:space-between;padding:11px 0;border-bottom:1px solid var(--line);font-size:14px}
.sum-line span:first-child{color:var(--fg-mut)}
.sum-line.off{opacity:.35}
.sum-total{display:flex;justify-content:space-between;margin-top:16px;font-size:15px;font-weight:600}
.consent{display:flex;gap:10px;font-size:12.5px;color:var(--fg-mut);align-items:flex-start;margin-top:4px}
.consent input{margin-top:3px;accent-color:var(--teal)}
.reg-note{font-size:12px;color:var(--fg-mut);margin-top:14px;line-height:1.5}
#dietRow{display:none}
#dietRow.show{display:block}

/* pratique */
.prat{display:grid;grid-template-columns:1.2fr 1fr 1.2fr;gap:22px}
.prat-card{border:1px solid var(--line);border-radius:16px;padding:30px 28px;background:var(--panel)}
.prat-card h3{font-size:20px;font-weight:300;letter-spacing:.03em;margin-bottom:16px;color:var(--fg)}
.prat-card p{color:var(--fg-soft);font-size:14.5px}
.prat-card b{font-weight:700;color:var(--fg)}
.acc{list-style:none;margin-top:16px;display:flex;flex-direction:column;gap:10px}
.acc li{font-size:13.5px;color:var(--fg-mut);padding-left:20px;position:relative}
.acc li::before{content:"";position:absolute;left:0;top:8px;width:7px;height:7px;border-radius:50%;background:var(--teal-deep)}
.price-badge{margin-top:20px;display:inline-flex;align-items:baseline;gap:10px;border:1px solid var(--line);border-radius:12px;padding:14px 20px;background:rgba(53,201,221,.06)}
.price-badge b{font-family:'Jost';font-weight:300;font-size:32px;color:var(--teal)}
.price-badge span{font-size:12px;color:var(--fg-mut);letter-spacing:.04em}
.prat-card.noshow{border-color:rgba(53,201,221,.28)}
.ns-fees{display:flex;gap:14px;margin-top:20px}
.ns-fees div{flex:1;border:1px solid var(--line);border-radius:12px;padding:16px;text-align:center}
.ns-fees b{font-family:'Jost';font-weight:300;font-size:26px;color:var(--fg);display:block}
.ns-fees span{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--fg-mut)}
.pay-note{border:1px solid var(--line);border-radius:12px;padding:14px 16px;background:rgba(53,201,221,.05);
  font-size:13px;color:var(--fg-soft);margin-bottom:20px;line-height:1.55}
.pay-note a{color:var(--teal);text-decoration:underline}
.sum-line.price span:last-child{color:var(--teal);font-weight:700}
@media(max-width:960px){.prat{grid-template-columns:1fr}}

/* footer */
footer{padding:64px 0 40px;border-top:1px solid var(--line);background:var(--ink);position:relative;z-index:1}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;align-items:start}
.foot p,.foot a{color:var(--fg-mut);font-size:14px}
.foot a:hover{color:var(--teal)}
.foot h5{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--fg-soft);margin-bottom:16px}
.foot .fl{display:flex;flex-direction:column;gap:9px}
.foot-bottom{margin-top:48px;padding-top:24px;border-top:1px solid var(--line);display:flex;justify-content:space-between;
  flex-wrap:wrap;gap:12px;color:var(--fg-mut);font-size:12.5px}

/* reveal */
.rv{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.rv.in{opacity:1;transform:none}

/* responsive */
@media(max-width:960px){
  nav .links{display:none}
  .lang{display:flex;margin-left:auto}      /* garder FR/NL visible sur mobile */
  .burger{display:none}                      /* pas de menu burger : le CTA suffit */
  .nav{gap:12px;height:66px}
  .brand img{height:38px}
  .cta{padding:9px 15px;font-size:13px}
  .lang button{padding:5px 9px;font-size:11px}
  .two,.reg-grid{grid-template-columns:1fr}
  .awards,.bene,.spk-grid{grid-template-columns:1fr 1fr}
  .gal{grid-template-columns:1fr 1fr}
  .summary{position:static}
}
@media(max-width:560px){
  .nav{gap:8px}
  .brand img{height:32px}
  .cta{padding:8px 12px;font-size:12px}
  .lang{padding:2px}
  .lang button{padding:5px 8px;font-size:10.5px;letter-spacing:.02em}
  .awards,.bene,.spk-grid,.gal{grid-template-columns:1fr}
  .countdown{gap:14px}
  .field.two-col{grid-template-columns:1fr}
  .hero{min-height:88vh}
}
@media(prefers-reduced-motion:reduce){.rv{transition:none;opacity:1;transform:none}html{scroll-behavior:auto}}