/* ===== Design tokens ===== */
:root{
  --navy-950:#0C1A2E;
  --navy-900:#12253F;
  --navy-800:#1B365B;
  --navy-700:#294E7E;
  --blue-500:#1C6FD6;
  --blue-400:#4DA3FF;
  --green-700:#0A4D3D;
  --green-600:#0F6A53;
  --green-400:#46B891;
  --green-200:#82D0B3;
  --ink-900:#131A24;
  --ink-700:#1B365B;
  --ink-500:#4A5563;
  --ink-400:#8593A6;
  --paper-0:#FFFFFF;
  --paper-100:#F6F8FB;
  --paper-200:#E3E8EF;
  --paper-line:#CDD5E0;
  --on-dark-100:#EAF1FA;
  --on-dark-70:rgba(234,241,250,.7);
  --on-dark-55:rgba(234,241,250,.55);
  --radius-sm:10px;
  --radius-md:16px;
  --radius-lg:22px;
  --radius-pill:999px;
  --shadow-card:0 2px 6px rgba(16,30,52,.08);
  --shadow-lift:0 16px 40px rgba(27,54,91,.22);
  --container:1180px;
  --font:'Poppins',system-ui,-apple-system,Segoe UI,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink-900);
  background:var(--paper-0);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--blue-500);text-decoration:none}
h1,h2,h3,h4,p{margin:0}
ul{margin:0;padding:0;list-style:none}
button{font-family:inherit;cursor:pointer}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
section{padding:88px 0}
@media (max-width:720px){section{padding:56px 0}}

.eyebrow{
  font-size:12.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  margin-bottom:14px;display:block;
}
.eyebrow--green{color:var(--green-600)}
.eyebrow--mint{color:var(--green-400)}

h2.section-title{
  font-size:clamp(28px,4vw,40px);font-weight:800;line-height:1.12;
  letter-spacing:-.015em;color:var(--ink-700);margin-bottom:16px;
}
.section-lede{font-size:16.5px;line-height:1.6;color:var(--ink-500);max-width:640px}
.on-dark h2.section-title{color:#fff}
.on-dark .section-lede{color:var(--on-dark-70)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:16px 30px;border-radius:var(--radius-pill);
  font-size:15px;font-weight:700;border:1px solid transparent;
  transition:background-color .15s ease, border-color .15s ease, transform .15s ease;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--green-600);color:#fff;box-shadow:var(--shadow-lift)}
.btn-primary:hover{background:var(--green-700)}
.btn-ghost-dark{border-color:rgba(234,241,250,.32);color:var(--on-dark-100)}
.btn-ghost-dark:hover{border-color:var(--blue-400);color:#fff}
.btn-block{display:flex;width:100%}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 24px;
  background:rgba(12,26,46,.92);
  border-bottom:1px solid rgba(234,241,250,.1);
}
/* backdrop-filter lives on a pseudo-element, not the header itself:
   a filter/backdrop-filter on an element makes IT the containing block
   for any position:fixed descendant (like .site-nav's mobile panel),
   which would confine that panel to the header's own height instead
   of the viewport. */
.site-header::before{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
}
.brand-cobrand{display:flex;align-items:center;gap:14px}
.brand-wordmark{font-size:21px;font-weight:900;color:#fff;letter-spacing:-.02em;white-space:nowrap}
.brand-wordmark span{color:var(--blue-400)}
.brand-divider{width:1px;height:22px;background:rgba(234,241,250,.25)}
.brand-kalon{display:flex;align-items:center;gap:8px}
.brand-kalon img{height:20px;width:auto;filter:brightness(0) invert(1);opacity:.85}
.brand-kalon-text{font-size:10.5px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:rgba(234,241,250,.55);line-height:1.3}

.site-nav{display:flex;align-items:center;gap:28px}
.site-nav a{font-size:13.5px;font-weight:500;color:var(--on-dark-100)}
.site-nav a:hover{color:var(--blue-400)}
.nav-cta{padding:11px 22px;border-radius:var(--radius-pill);background:var(--green-600);color:#fff !important;font-size:13.5px;font-weight:700}
.nav-cta:hover{background:var(--green-700)}
.nav-toggle{display:none;background:none;border:0;color:#fff;padding:6px}

/* Bascule en menu burger dès 980px : en dessous, la nav horizontale
   n'a plus assez de place et vient toucher le cobranding. */
@media (max-width:980px){
  .site-nav{position:fixed;inset:60px 0 0 0;background:var(--navy-950);flex-direction:column;justify-content:flex-start;padding:32px 24px;gap:22px;transform:translateY(-8px);opacity:0;pointer-events:none;transition:opacity .18s ease, transform .18s ease}
  .site-nav.is-open{opacity:1;transform:translateY(0);pointer-events:auto}
  .nav-toggle{display:block}
}

/* ===== Hero ===== */
.hero{
  position:relative;background:var(--navy-950);overflow:hidden;
  padding:76px 0 56px;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse 90% 65% at 15% 0%, rgba(27,54,91,.55), rgba(12,26,46,.98) 62%);
}
.hero-layout{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;margin-bottom:56px}
.hero-copy{text-align:left}
@media (max-width:900px){
  .hero-layout{grid-template-columns:1fr;text-align:center}
  .hero-copy{text-align:center}
}
.badge{
  display:inline-flex;align-items:center;gap:9px;padding:8px 18px;border-radius:var(--radius-pill);
  background:rgba(15,106,83,.22);border:1px solid rgba(70,184,145,.45);
  color:var(--green-200);font-size:12.5px;font-weight:700;letter-spacing:.05em;
  margin-bottom:26px;
}
.badge-dot{width:7px;height:7px;border-radius:50%;background:var(--green-400)}
.hero h1{
  font-size:clamp(34px,4.4vw,54px);font-weight:900;line-height:1.06;
  letter-spacing:-.025em;color:#fff;margin:0 0 20px;
}
.hero h1 em{font-style:normal;color:var(--blue-400)}
.hero-sub{
  margin:0 0 34px;max-width:520px;font-size:18px;line-height:1.6;color:var(--on-dark-70);
}
@media (max-width:900px){.hero-sub{margin:0 auto 34px}}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:44px}
@media (max-width:900px){.hero-ctas{justify-content:center}}
.hero-facts{
  display:grid;grid-template-columns:repeat(3,1fr);gap:22px;max-width:520px;
  padding-top:28px;border-top:1px solid rgba(234,241,250,.16);
}
@media (max-width:900px){.hero-facts{margin:0 auto}}
.hero-fact-value{font-size:28px;font-weight:900;color:#fff;letter-spacing:-.02em;line-height:1.1}
.hero-fact-label{font-size:12px;font-weight:500;color:var(--on-dark-70);margin-top:4px;line-height:1.35}

/* Hero visual: illustrated collectible cup cards */
.hero-visual{
  position:relative;display:flex;justify-content:center;align-items:flex-end;gap:16px;
  min-height:300px;padding-top:20px;
}
@media (max-width:900px){.hero-visual{margin-top:8px}}
.cup-card{
  width:118px;height:168px;flex:none;
  clip-path:polygon(9% 0,91% 0,100% 100%,0 100%);
  display:flex;flex-direction:column;justify-content:space-between;align-items:center;
  padding:16px 8px;box-shadow:0 18px 44px rgba(0,0,0,.4);
}
.cc-brand{font-size:8px;font-weight:800;letter-spacing:.12em;color:rgba(255,255,255,.55)}
.cc-number{font-size:38px;font-weight:900;color:#fff;line-height:1}
.cc-role{font-size:8.5px;font-weight:700;letter-spacing:.06em;color:rgba(255,255,255,.8)}
.cup-card--a{background:linear-gradient(170deg,var(--navy-700),#12253F);transform:rotate(-7deg) translateY(6px)}
.cup-card--b{width:140px;height:200px;background:linear-gradient(170deg,var(--blue-400),var(--blue-500));transform:translateY(-16px);z-index:2}
.cup-card--b .cc-number{font-size:46px}
.cup-card--rare{background:linear-gradient(170deg,#1E9C74,#06352A);box-shadow:0 0 0 2px rgba(70,184,145,.55), 0 18px 44px rgba(0,0,0,.4);transform:rotate(8deg) translateY(10px)}
.cup-card--rare .cc-number{font-size:42px;color:var(--green-200)}

.cup-strip{display:grid;grid-template-columns:repeat(15,1fr);gap:6px;margin-top:0;max-width:900px;margin-left:auto;margin-right:auto}
.cup{
  aspect-ratio:3/4;clip-path:polygon(9% 0,91% 0,100% 100%,0 100%);
  background:linear-gradient(170deg,var(--navy-700),#12253F);
  display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:900;color:#fff;
}
.cup--rare{background:linear-gradient(170deg,#1E9C74,#06352A);box-shadow:0 0 0 2px rgba(70,184,145,.55)}
.cup-caption{margin:12px 0 0;font-size:12.5px;color:var(--on-dark-70)}
@media (max-width:640px){.cup-strip{grid-template-columns:repeat(8,1fr)}}

@media (max-width:900px){
  .hero-visual{gap:10px;min-height:auto;padding-top:0;margin-top:36px}
  .cup-card,
  .cup-card--a,
  .cup-card--b,
  .cup-card--rare{width:86px;height:122px;padding:10px 6px;transform:none}
  .cup-card--b{width:98px;height:140px}
  .cc-brand{font-size:7px}
  .cc-number{font-size:26px}
  .cup-card--b .cc-number{font-size:30px}
  .cup-card--rare .cc-number{font-size:28px}
  .cc-role{font-size:7.5px}
}
@media (max-width:380px){
  .hero-visual{gap:7px}
  .cup-card,.cup-card--a,.cup-card--b,.cup-card--rare{width:74px;height:106px;padding:8px 5px}
  .cup-card--b{width:86px;height:122px}
}

/* ===== Problem cards ===== */
.card-grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media (max-width:860px){.card-grid-3{grid-template-columns:1fr}}
.problem-card{background:var(--paper-100);border:1px solid var(--paper-200);border-radius:var(--radius-md);padding:30px 26px}
.problem-card .tag{font-size:11.5px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:var(--green-600);margin-bottom:14px;display:block}
.problem-card h3{font-size:18.5px;font-weight:700;color:var(--ink-700);line-height:1.3;margin-bottom:9px}
.problem-card p{font-size:14.5px;line-height:1.55;color:var(--ink-500)}
.source-note{margin-top:22px;font-size:12.5px;line-height:1.6;color:var(--ink-400)}

/* ===== Solution steps ===== */
.step-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
@media (max-width:900px){.step-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.step-grid{grid-template-columns:1fr}}
.step-card{background:var(--navy-900);border:1px solid rgba(234,241,250,.1);border-radius:var(--radius-md);padding:24px 20px}
.step-card .tag{font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:rgba(77,163,255,.85);margin-bottom:14px;display:block}
.step-card h3{font-size:16px;font-weight:700;color:#fff;line-height:1.3;margin-bottom:8px}
.step-card p{font-size:13.5px;line-height:1.5;color:rgba(234,241,250,.62)}

/* ===== Economic model / calculator ===== */
.model-panel{
  background:var(--navy-800);border-radius:var(--radius-lg);
  padding:44px;display:grid;grid-template-columns:1.05fr 1fr;gap:44px;align-items:start;
  box-shadow:var(--shadow-lift);
}
@media (max-width:900px){.model-panel{grid-template-columns:1fr;padding:30px 24px}}

.model-note{
  background:rgba(234,241,250,.06);border:1px solid rgba(234,241,250,.14);border-radius:12px;
  padding:14px 18px;font-size:13px;line-height:1.55;color:var(--on-dark-70);margin-bottom:24px;
}
.model-note strong{color:#fff}

.slider-row{margin-bottom:18px}
.slider-row .row-top{display:flex;justify-content:space-between;margin-bottom:8px}
.slider-row label{font-size:13.5px;font-weight:500;color:var(--on-dark-70)}
.slider-row output{font-size:14px;font-weight:800;color:var(--blue-400)}
.slider-row input[type="range"]{width:100%;accent-color:var(--blue-400)}

.calc-formula{
  background:rgba(234,241,250,.06);border:1px solid rgba(234,241,250,.1);border-radius:12px;
  padding:18px 20px;font-size:13.5px;line-height:1.85;color:var(--on-dark-70);
}
.calc-formula strong{color:var(--blue-400);font-weight:800}

.result-card{background:var(--navy-900);border:1px solid rgba(234,241,250,.1);border-radius:20px;padding:30px 28px;margin-bottom:16px}
.result-label{font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--on-dark-55);margin-bottom:8px}
.result-value{font-size:56px;font-weight:900;line-height:1;letter-spacing:-.03em;color:#fff}
.result-value span{font-size:32px}
.result-caveat{margin-top:10px;font-size:12px;line-height:1.5;color:var(--on-dark-55)}

.stat-mini-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.stat-mini{background:var(--navy-900);border:1px solid rgba(234,241,250,.08);border-radius:14px;padding:18px 16px}
.stat-mini--accent{border-color:rgba(70,184,145,.4)}
.stat-mini .v{font-size:23px;font-weight:900;color:#fff;margin-bottom:4px}
.stat-mini--accent .v{color:var(--green-200)}
.stat-mini .l{font-size:12px;line-height:1.4;color:var(--on-dark-70)}

/* ===== Value prop ===== */
.value-card{background:#fff;border:1px solid var(--paper-200);border-top:4px solid var(--navy-800);border-radius:var(--radius-md);padding:30px 26px;box-shadow:var(--shadow-card)}
.value-card--blue{border-top-color:var(--blue-400)}
.value-card--green{border-top-color:var(--green-600)}
.value-card h3{font-size:18.5px;font-weight:700;color:var(--ink-700);margin-bottom:15px}
.value-card li{font-size:14.5px;line-height:1.55;color:var(--ink-500);margin-bottom:9px}
.value-card li:last-child{margin-bottom:0}

/* ===== Impact ===== */
.impact-layout{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center}
@media (max-width:860px){.impact-layout{grid-template-columns:1fr}}
.impact-stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.impact-stat{background:#fff;border:1px solid #BCE6D6;border-radius:var(--radius-md);padding:24px 20px}
.impact-stat .v{font-size:27px;font-weight:900;color:var(--green-600);letter-spacing:-.02em;margin-bottom:6px}
.impact-stat .l{font-size:13.5px;line-height:1.45;color:var(--ink-500)}
.pill-inline{display:inline-flex;align-items:center;gap:10px;padding:11px 20px;border-radius:var(--radius-pill);background:#E1F4EC;color:var(--green-600);font-size:13.5px;font-weight:700}

/* ===== FAQ ===== */
.faq-layout{display:grid;grid-template-columns:.75fr 1.25fr;gap:52px;align-items:start}
@media (max-width:860px){.faq-layout{grid-template-columns:1fr}}
.faq-item{border:1px solid var(--paper-200);border-radius:12px;background:var(--paper-100);overflow:hidden}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 22px;background:none;border:0;text-align:left;
  font-size:15.5px;font-weight:700;color:var(--ink-700);
}
.faq-q .chev{flex:none;transition:transform .15s ease;color:var(--ink-400)}
.faq-item[open] .faq-q .chev{transform:rotate(180deg)}
.faq-a{padding:0 22px 20px;font-size:14.5px;line-height:1.6;color:var(--ink-500)}
.faq-list{display:flex;flex-direction:column;gap:12px}

/* ===== CTA + form ===== */
.cta-section{position:relative;background:var(--navy-950);overflow:hidden}
.cta-layout{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
@media (max-width:900px){.cta-layout{grid-template-columns:1fr}}
.check-list{display:flex;flex-direction:column;gap:12px;margin-top:24px}
.check-item{display:flex;align-items:center;gap:12px;font-size:14.5px;color:rgba(234,241,250,.85)}
.check-dot{width:22px;height:22px;flex:none;border-radius:var(--radius-pill);background:rgba(70,184,145,.22);color:var(--green-400);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800}

.form-card{background:#fff;border-radius:var(--radius-lg);padding:32px;box-shadow:0 18px 48px rgba(0,0,0,.35)}
.form-card h3{font-size:20px;font-weight:800;color:var(--ink-700);margin-bottom:20px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:16px}
@media (max-width:480px){.form-grid{grid-template-columns:1fr}}
.field label{display:block;font-size:12.5px;font-weight:600;color:var(--ink-500);margin-bottom:6px}
.field input,.field select{
  width:100%;padding:12px 14px;border:1px solid var(--paper-line);border-radius:8px;
  font-family:var(--font);font-size:14px;color:var(--ink-900);background:#fff;
}
.field input:focus,.field select:focus{outline:2px solid var(--blue-400);outline-offset:1px}
.form-note{margin-top:12px;font-size:11.5px;line-height:1.5;color:var(--ink-400);text-align:center}
.form-status{margin-top:12px;font-size:13px;text-align:center;color:var(--green-600);font-weight:600;min-height:18px}

/* ===== Footer ===== */
.site-footer{background:var(--navy-950);border-top:1px solid rgba(234,241,250,.12);padding:44px 0 26px}
.footer-top{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin-bottom:28px;flex-wrap:wrap}
.footer-brand-word{font-size:18px;font-weight:900;color:#fff;letter-spacing:-.01em;margin-bottom:10px}
.footer-brand-word span{color:var(--blue-400)}
.footer-tagline{margin:0 0 16px;font-size:13.5px;line-height:1.6;color:rgba(234,241,250,.55);max-width:300px}
.footer-kalon-badge{display:inline-flex;align-items:center;padding:10px 16px;border-radius:12px;background:#fff}
.footer-kalon-badge img{height:32px;width:auto}
.footer-contact{font-size:14px;line-height:1.8;color:rgba(234,241,250,.6);text-align:right}
.footer-contact .name{color:rgba(234,241,250,.85);font-weight:600}
.footer-contact a{color:rgba(234,241,250,.7);font-weight:600}
@media (max-width:640px){.footer-contact{text-align:left}}
.footer-bottom{border-top:1px solid rgba(234,241,250,.1);padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:12.5px;color:rgba(234,241,250,.38)}

.skip-link{position:absolute;left:-999px;top:auto}
.skip-link:focus{left:16px;top:16px;z-index:100;background:#fff;padding:10px 16px;border-radius:8px;color:var(--ink-900)}

/* ===== FAQ : titres sémantiques dans les <summary> ===== */
.faq-q h3{font:inherit;color:inherit;margin:0}

/* ===== Section "En bref" ===== */
.brief-section{background:var(--paper-0);padding-bottom:64px}
.brief-definition{
  max-width:820px;margin-top:18px;
  font-size:17px;line-height:1.7;color:var(--ink-500);
}
.brief-definition strong{color:var(--ink-900);font-weight:700}
.brief-facts{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  margin:40px 0 0;padding:1px;
  background:var(--paper-200);border-radius:var(--radius-md);overflow:hidden;
}
.brief-facts > div{background:var(--paper-0);padding:22px 20px}
.brief-facts dt{
  font-size:11.5px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;
  color:var(--green-600);margin-bottom:9px;
}
.brief-facts dd{margin:0;font-size:14px;line-height:1.55;color:var(--ink-500)}
@media (max-width:900px){.brief-facts{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.brief-facts{grid-template-columns:1fr}}

/* <address> sémantique dans le footer : neutralise l'italique par défaut */
.footer-contact{font-style:normal}