/* ============================================================
   Serendip Innovations - Socle commun (chargé par TOUTES les pages)
   Tokens :root, reset, typographie, boutons, NAV, FOOTER, reveals.
   Le CSS propre à chaque page vit dans assets/<page>.css :
   home.css, contact.css, legal.css, 404.css.
   ============================================================ */

:root{
  --white:#ffffff;
  --cream:#faf7f0;            /* warm off-white */
  --cream-2:#f3eddf;
  --mist:#edf7f1;             /* soft green mist */
  --mist-warm:#fbf6ee;
  --ink:#15211c;             /* warm near-black */
  --ink-2:#243630;
  --ink-soft:#586159;        /* warm gray */
  --ink-faint:#8c958c;
  --green:#00bf73;
  --green-deep:#079f67;
  --green-warm:#34c98a;
  --blue:#69c2d4;
  --blue-deep:#36a9e1;
  --teal:#1ea596;
  --red:#e5564b;
  --red-soft:#ff8276;
  --line:rgba(21,33,28,0.10);
  --line-soft:rgba(21,33,28,0.055);
  --grad:linear-gradient(105deg,#00bf73 0%,#22b59a 54%,#69c2d4 100%);
  --grad-soft:linear-gradient(135deg,#e7f8ee 0%,#eef6fb 100%);
  --grad-warm:linear-gradient(125deg,#fdf4e8 0%,#eef9f0 55%,#e9f5fb 100%);
  --shadow-s:0 2px 4px rgba(21,40,30,.04),0 12px 30px rgba(21,55,42,.06);
  --shadow-m:0 4px 10px rgba(21,40,30,.05),0 28px 64px rgba(18,62,46,.11);
  --display:'Sora',system-ui,-apple-system,sans-serif;
  --body:'Inter',system-ui,-apple-system,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,monospace;
  --maxw:1180px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--body);color:var(--ink);background:var(--white);
  line-height:1.65;font-size:17px;font-weight:400;letter-spacing:-0.01em;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden;
}
::selection{background:rgba(0,191,115,.2)}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;width:100%}
.section{padding:124px 0;position:relative;scroll-margin-top:72px}
.section--tight{padding:92px 0;scroll-margin-top:72px}
.cream{background:var(--cream)}
.mist{background:var(--mist)}
.ink-bg{background:#14201c;color:#e3ede9}

.eyebrow{
  font-family:var(--mono);font-size:12px;font-weight:500;letter-spacing:.2em;text-transform:uppercase;
  color:var(--teal);display:inline-flex;align-items:center;gap:10px;margin-bottom:22px;
}
.eyebrow::before{content:"";width:22px;height:1.5px;background:var(--grad);border-radius:2px}
.ink-bg .eyebrow{color:var(--green-warm)}

h1,h2,h3{font-family:var(--display);font-weight:700;letter-spacing:-0.035em;line-height:1.05;color:var(--ink)}
h2{font-size:clamp(2rem,4.4vw,3.3rem)}
h3{font-size:clamp(1.22rem,2vw,1.5rem);letter-spacing:-0.025em;line-height:1.18}
.lead{font-size:clamp(1.06rem,1.45vw,1.28rem);color:var(--ink-soft);font-weight:400;line-height:1.58;max-width:52ch}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

.btn{
  display:inline-flex;align-items:center;gap:9px;font-family:var(--body);font-weight:550;font-size:15.5px;letter-spacing:-0.01em;
  padding:13px 24px;border-radius:100px;border:1px solid transparent;cursor:pointer;
  transition:transform .4s var(--ease),box-shadow .4s var(--ease),background .3s,color .3s;white-space:nowrap;
}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(21,40,30,.22)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--ink);transform:translateY(-2px)}
.btn .arr{transition:transform .4s var(--ease)}
.btn:hover .arr{transform:translateX(4px)}

/* ===== NAV ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .4s var(--ease),box-shadow .4s var(--ease)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:12px 28px;display:flex;align-items:center;justify-content:space-between;gap:24px;transition:padding .6s cubic-bezier(.65,0,.35,1)}
.nav.scrolled{background:rgba(252,250,245,.8);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);box-shadow:0 1px 0 var(--line-soft)}
.nav.scrolled .nav-inner{padding:8px 28px}
.brand{display:flex;align-items:center;transition:transform .4s var(--ease)}
.brand:hover{transform:scale(1.015)}
.brand{position:relative;line-height:0}
.brand svg{height:68px;width:auto;display:block;transition:height .6s cubic-bezier(.65,0,.35,1),opacity .55s cubic-bezier(.65,0,.35,1)}
.brand .logo-black{position:absolute;top:0;left:0;opacity:0}
.nav.scrolled .brand svg{height:34px}
.nav.scrolled .brand .logo-color{opacity:0}
.nav.scrolled .brand .logo-black{opacity:1}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-links a{font-size:15px;font-weight:450;color:var(--ink-2);padding:8px 14px;border-radius:9px;transition:color .25s,background .25s}
.nav-links a:hover{color:var(--green-deep);background:rgba(0,191,115,.07)}
.nav-cta{margin-left:8px}
.nav-right{display:flex;align-items:center;gap:14px}
.lang-switch{display:inline-flex;align-items:center;gap:2px;font-family:var(--mono);font-size:12px;font-weight:600;letter-spacing:.03em;border:1px solid var(--line);border-radius:100px;padding:3px;flex-shrink:0}
.lang-switch a,.lang-switch span{display:block;padding:4px 9px;border-radius:100px;line-height:1;color:var(--ink-2);text-decoration:none;transition:color .25s,background .25s}
.lang-switch a:hover{color:var(--green-deep)}
.lang-switch .lang-active{background:var(--ink);color:#fff}
@media(max-width:860px){.nav-right{gap:8px}}
.nav-links a.btn-primary,.nav-links a.btn-primary:hover{color:#fff;background:var(--ink)}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.burger span{width:22px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}

/* ===== reveal ===== */
.reveal{opacity:0;transform:translateY(32px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal-d1{transition-delay:.08s}.reveal-d2{transition-delay:.16s}.reveal-d3{transition-delay:.24s}.reveal-d4{transition-delay:.32s}

/* ===== FOOTER ===== */
footer{padding:70px 0 40px;border-top:1px solid var(--line);background:var(--cream)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:48px;margin-bottom:52px}
.foot-brand svg{height:76px;margin-bottom:22px}
.foot-brand p{color:var(--ink-soft);font-size:15px;max-width:36ch}
.foot-sig{font-family:var(--display);font-weight:600;font-size:15px;margin-top:18px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.foot-col h4{font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-faint);font-weight:600;margin-bottom:18px}
.foot-col a{display:block;color:var(--ink-soft);font-size:15px;padding:6px 0;transition:color .25s,transform .25s}
.foot-col a:hover{color:var(--green-deep);transform:translateX(3px)}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;padding-top:28px;border-top:1px solid var(--line-soft);color:var(--ink-faint);font-size:13.5px}
.foot-legal-links{display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.foot-bottom a{color:var(--ink-faint);transition:color .25s}
.foot-bottom a:hover{color:var(--green-deep)}

/* ===== Accessibilité : réduction des animations ===== */
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.2s!important;scroll-behavior:auto}
  .word i,.hero-tag,.hero-sub,.hero-cta,.scroll-cue,.vlp-orb,.annot-line,.annot-dot,.annot-label{opacity:1!important;transform:none!important}
}

/* ===== Responsive : chrome (nav / footer / base) ===== */
@media(max-width:980px){
  .foot-grid{grid-template-columns:1fr;gap:36px}
}
@media(max-width:760px){
  body{font-size:16px}
  .section{padding:84px 0}
  .nav-links{position:fixed;top:0;right:0;bottom:0;width:78%;max-width:320px;background:rgba(252,250,245,.98);backdrop-filter:blur(20px);flex-direction:column;align-items:flex-start;justify-content:center;gap:6px;padding:40px 32px;transform:translateX(100%);transition:transform .45s var(--ease);box-shadow:-20px 0 60px rgba(0,0,0,.1)}
  .nav-links.open{transform:translateX(0)}
  .nav-links a{font-size:19px;padding:12px 0;width:100%}
  .nav-cta{margin:14px 0 0}
  .burger{display:flex;z-index:101}
  .burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .burger.open span:nth-child(2){opacity:0}
  .burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .wrap{padding:0 22px}
}