/* ===== Tokens ===== */
:root{
  --blue:#2f5cff;
  --blue-light:#7c9dff;
  --cyan:#5ce1ff;
  --navy:#070912;
  --navy-2:#0d1120;
  --navy-3:#11162a;
  --ink:#eef1fb;
  --muted:#8892ab;
  --line: rgba(255,255,255,0.09);

  --radius:20px;
  --radius-sm:12px;
  --maxw:1240px;
  --ff-head:'Space Grotesk', sans-serif;
  --ff-mono:'JetBrains Mono', monospace;
  --ff-body:'Inter', sans-serif;
  --ease: cubic-bezier(.16,.8,.24,1);
}

/* Thème clair automatique selon les préférences de l'appareil */
:root{color-scheme:dark}
@media (prefers-color-scheme: light){
  :root{
    color-scheme:light;
    --navy:#f2f5fc;
    --navy-2:#e8ecf7;
    --navy-3:#dde3f2;
    --ink:#12162a;
    --muted:#5a6379;
    --line: rgba(15,22,50,0.13);
    --blue-light:#3a55c8;
    --cyan:#0a8fb5;
  }
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--navy);
  color:var(--ink);
  font-family:var(--ff-body);
  font-weight:300;
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}

::selection{background:var(--blue);color:#fff}

/* ===== Grid motif ===== */
.grid-motif{
  position:absolute;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(rgba(124,157,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124,157,255,0.06) 1px, transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(ellipse 70% 60% at 50% 30%, #000 0%, transparent 75%);
  mask-image:radial-gradient(ellipse 70% 60% at 50% 30%, #000 0%, transparent 75%);
}

/* ===== Noise + cursor glow ===== */
.noise-overlay{
  position:fixed;inset:0;pointer-events:none;z-index:2;opacity:.035;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.cursor-glow{
  position:fixed;top:0;left:0;width:520px;height:520px;border-radius:50%;pointer-events:none;z-index:1;
  background:radial-gradient(circle, rgba(92,225,255,0.11) 0%, rgba(92,225,255,0) 70%);
  transform:translate(-50%,-50%);
  transition:opacity .3s ease;
  will-change:transform;
}
@media (hover:none){ .cursor-glow{display:none} }

/* ===== Header ===== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:22px 0;
  transition:padding .35s var(--ease), background .35s var(--ease), border-color .35s var(--ease);
  border-bottom:1px solid transparent;
}
.site-header.scrolled{
  padding:14px 0;
  background:rgba(7,9,18,0.75);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo-group{display:flex;align-items:center;gap:14px}
.logo{display:flex;align-items:center;gap:2px;font-family:var(--ff-head);font-weight:600;letter-spacing:.04em;font-size:18px}
.logo-mark{
  width:38px;height:38px;object-fit:contain;margin-right:8px;
  filter:drop-shadow(0 0 10px rgba(47,92,255,0.35));
}
.logo-word{color:var(--ink)}
.logo-sub{color:var(--muted)}
.back-hub{
  font-family:var(--ff-mono);font-size:11.5px;color:var(--muted);
  padding-left:14px;border-left:1px solid var(--line);
  transition:color .25s var(--ease);
}
.back-hub:hover{color:var(--cyan)}
.main-nav{display:flex;gap:36px;font-size:14px}
.main-nav a{color:var(--muted);transition:color .25s var(--ease);position:relative}
.main-nav a:hover{color:var(--ink)}
.nav-cta{font-size:13px;padding:10px 20px}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:22px;height:2px;background:var(--ink)}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 28px;border-radius:100px;font-size:14px;font-weight:500;
  border:1px solid transparent;transition:all .3s var(--ease);white-space:nowrap;
}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-light);transform:translateY(-2px)}
.btn-outline{border-color:var(--line);color:var(--ink)}
.btn-outline:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}
.btn-ghost{border-color:var(--line);color:var(--ink);padding:10px 22px}
.btn-ghost:hover{border-color:var(--blue)}

/* ===== Fond 3D plein site ===== */
.bg-canvas{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}
body{background:radial-gradient(120% 100% at 50% 0%, #0c1024 0%, #070912 60%) fixed}
main{position:relative;z-index:1}
.site-footer{position:relative;z-index:1}

/* ===== Hero ===== */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  overflow:hidden;
}
.hero-vignette{
  position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(180deg, rgba(7,9,18,0) 0%, rgba(7,9,18,0.12) 70%, rgba(7,9,18,0.4) 100%);
}
.hero-content{position:relative;z-index:2;padding-top:90px}
.eyebrow{
  font-family:var(--ff-mono);
  font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);
  margin-bottom:22px;font-weight:400;
  display:inline-flex;align-items:center;gap:10px;
}
.eyebrow .blink{
  display:inline-block;width:8px;height:14px;background:var(--cyan);
  animation:blink 1.1s steps(1) infinite;
}
@keyframes blink{ 0%,49%{opacity:1} 50%,100%{opacity:0} }
.hero-title{font-family:var(--ff-head);font-weight:700;line-height:.95;margin-bottom:22px}
.hero-title .line{font-size:clamp(52px, 9vw, 118px);letter-spacing:-.02em;
  background:linear-gradient(120deg, #fff 30%, var(--blue-light) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-tagline{font-family:var(--ff-head);font-size:clamp(17px,2.2vw,24px);color:var(--ink);margin-bottom:20px;font-weight:500}
.hero-tagline .dot{color:var(--cyan)}
.hero-desc{max-width:560px;color:var(--muted);font-size:16px;margin-bottom:40px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}

.scroll-cue{
  position:absolute;bottom:36px;left:50%;transform:translateX(-50%);z-index:2;
  display:flex;flex-direction:column;align-items:center;gap:10px;
}
.scroll-cue span{
  width:1px;height:46px;background:linear-gradient(180deg, var(--cyan) 0%, transparent 100%);
  position:relative;overflow:hidden;
}
.scroll-cue span::after{
  content:'';position:absolute;top:-100%;left:0;width:100%;height:100%;background:#fff;
  animation:scrollLine 2.2s ease-in-out infinite;
}
@keyframes scrollLine{ 0%{top:-100%} 60%{top:100%} 100%{top:100%} }
.scroll-cue p{font-family:var(--ff-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}

/* ===== Reveal ===== */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s var(--ease), transform .8s var(--ease)}
.reveal.in{opacity:1;transform:translateY(0)}

/* ===== Section commons ===== */
section{padding:140px 0;position:relative}
.section-kicker{
  font-family:var(--ff-mono);
  font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);margin-bottom:16px;font-weight:400;
}
.section-title{font-family:var(--ff-head);font-size:clamp(28px,4vw,46px);font-weight:600;line-height:1.15;letter-spacing:-.01em}
.accent{color:var(--blue-light)}
.accent-cyan{color:var(--cyan)}
.section-lead{color:var(--muted);font-size:16px;max-width:620px;margin-top:20px}

/* ===== Pillars ===== */
.pillars{background:rgba(13,17,32,0.5)}
.pillars-head{margin-bottom:56px;max-width:680px}
.pillar-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:24px;align-items:stretch}
.pillar{
  position:relative;border-radius:var(--radius);border:1px solid var(--line);
  background:linear-gradient(180deg, rgba(13,17,32,0.82), rgba(9,12,22,0.86));
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  padding:44px 40px;overflow:hidden;
}
.pillar-a{
  border-color:rgba(92,225,255,0.25);
  background:linear-gradient(160deg, rgba(47,92,255,0.22), rgba(92,225,255,0.1) 55%, rgba(9,12,22,0.86));
}
.pillar-glow{position:absolute;inset:-30% -20% auto auto;width:60%;height:60%;border-radius:50%;filter:blur(70px);opacity:.4;pointer-events:none}
.pillar-a .pillar-glow{background:var(--cyan)}
.pillar-b .pillar-glow{background:var(--blue)}
.pillar-tag{
  font-family:var(--ff-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  padding:6px 12px;border-radius:100px;border:1px solid var(--line);color:var(--muted);
  display:inline-block;margin-bottom:22px;position:relative;z-index:1;
}
.pillar-a .pillar-tag{color:var(--cyan);border-color:rgba(92,225,255,0.35)}
.pillar h3{font-family:var(--ff-head);font-size:clamp(22px,2.6vw,30px);font-weight:600;margin-bottom:16px;position:relative;z-index:1}
.pillar p{color:var(--muted);font-size:15px;margin-bottom:26px;max-width:480px;position:relative;z-index:1}
.pillar-list{display:flex;flex-direction:column;gap:12px;position:relative;z-index:1}
.pillar-list li{
  display:flex;align-items:flex-start;gap:10px;font-size:14.5px;color:var(--ink);
}
.pillar-list li::before{
  content:'';flex:0 0 auto;width:6px;height:6px;border-radius:50%;background:var(--cyan);margin-top:7px;
}
.pillar-b .pillar-list li::before{background:var(--blue-light)}

/* ===== Services grid ===== */
.services-head{margin-bottom:56px;max-width:680px}
.services-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.service-card{
  position:relative;display:flex;flex-direction:column;
  padding:30px 26px 28px;border-radius:var(--radius);
  border:1px solid var(--line);background:linear-gradient(180deg, rgba(13,17,32,0.8), rgba(9,12,22,0.84));
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  overflow:hidden;transition:transform .45s var(--ease), border-color .45s var(--ease);
  transform-style:preserve-3d;will-change:transform;
}
.service-card:hover{border-color:rgba(92,225,255,0.3)}
.sc-glow{position:absolute;inset:-40% -40% auto auto;width:55%;height:55%;border-radius:50%;filter:blur(50px);opacity:.28;background:var(--blue);transition:opacity .4s ease;pointer-events:none}
.service-card:hover .sc-glow{opacity:.5}
.sc-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}
.sc-index{font-family:var(--ff-mono);font-size:12px;color:var(--muted)}
.sc-icon{width:34px;height:34px;color:var(--cyan)}
.service-card h3{font-family:var(--ff-head);font-size:17.5px;font-weight:600;margin-bottom:10px;position:relative}
.sc-desc{color:var(--muted);font-size:13.5px;position:relative;flex:1}

/* ===== Approche ===== */
.approche{background:rgba(13,17,32,0.5)}
.approche-head{margin-bottom:64px;max-width:680px}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;position:relative}
.step{
  position:relative;padding:24px 24px 24px 0;border-radius:var(--radius-sm);
  background:linear-gradient(180deg, rgba(13,17,32,0.6), rgba(9,12,22,0.68));
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
}
.step:not(:last-child)::after{
  content:'';position:absolute;top:50px;left:0;width:100%;height:1px;
  background:linear-gradient(90deg, var(--cyan), transparent);
  transform:translateX(52px);
}
.step-num{
  font-family:var(--ff-mono);font-size:14px;color:var(--navy);
  width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg, var(--cyan), var(--blue));
  display:flex;align-items:center;justify-content:center;margin-bottom:26px;font-weight:500;
  position:relative;z-index:1;
}
.step h3{font-family:var(--ff-head);font-size:18px;font-weight:600;margin-bottom:10px}
.step p{color:var(--muted);font-size:14px}

/* ===== Pourquoi ===== */
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:56px}
.why-card{
  padding:30px 26px;border-radius:var(--radius);border:1px solid var(--line);
  background:linear-gradient(180deg, rgba(13,17,32,0.75), rgba(9,12,22,0.8));
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
}
.why-icon{width:30px;height:30px;color:var(--blue-light);margin-bottom:20px}
.why-card h3{font-family:var(--ff-head);font-size:16.5px;font-weight:600;margin-bottom:10px}
.why-card p{color:var(--muted);font-size:13.5px}

/* ===== Contact ===== */
.contact{padding-bottom:180px}
.contact-inner{text-align:center;max-width:640px;margin:0 auto}
.contact-text{color:var(--muted);margin:18px 0 34px}
.contact-email{
  font-family:var(--ff-head);font-size:clamp(22px,3.5vw,34px);font-weight:600;color:var(--ink);
  border-bottom:1px solid var(--line);padding-bottom:8px;transition:color .3s ease, border-color .3s ease;
}
.contact-email:hover{color:var(--cyan);border-color:var(--cyan)}
.contact-links{display:flex;gap:28px;justify-content:center;margin-top:36px;flex-wrap:wrap}
.contact-links a{font-family:var(--ff-mono);font-size:13px;color:var(--muted);transition:color .25s ease}
.contact-links a:hover{color:var(--ink)}

/* ===== Footer ===== */
.site-footer{border-top:1px solid var(--line);padding:50px 0}
.footer-inner{display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center}
.footer-brand{display:flex;align-items:center}
.footer-tag{font-size:13px;color:var(--muted)}
.footer-copy{font-size:12.5px;color:var(--muted);opacity:.7;margin-top:14px}
.footer-links{display:flex;gap:20px;margin-top:6px}
.footer-links a{font-family:var(--ff-mono);font-size:12px;color:var(--muted);transition:color .25s ease}
.footer-links a:hover{color:var(--cyan)}

/* ===== Responsive ===== */
@media (max-width:1080px){
  .services-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr);row-gap:48px}
  .step:nth-child(2)::after{display:none}
  .why-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:900px){
  .pillar-grid{grid-template-columns:1fr}
  .main-nav{
    display:flex;position:fixed;top:0;right:0;height:100vh;width:min(78vw,320px);
    background:rgba(7,9,18,0.98);backdrop-filter:blur(14px);
    flex-direction:column;align-items:flex-start;justify-content:center;gap:28px;
    padding:40px;transform:translateX(100%);transition:transform .4s var(--ease);
    border-left:1px solid var(--line);z-index:99;
  }
  .main-nav.open{transform:translateX(0)}
  .main-nav a{font-size:20px;color:var(--ink)}
  .nav-cta{display:none}
  .nav-toggle{display:flex;z-index:101}
  .nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle.active span:nth-child(2){opacity:0}
  .nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .nav-toggle span{transition:transform .3s ease, opacity .3s ease}
  section{padding:90px 0}
  .back-hub{display:none}
}
@media (max-width:640px){
  .services-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .step::after{display:none}
  .why-grid{grid-template-columns:1fr}
}
@media (max-width:520px){
  .wrap{padding:0 20px}
}
@media (prefers-reduced-motion: reduce){
  .reveal{transition:none;opacity:1;transform:none}
  html{scroll-behavior:auto}
  .eyebrow .blink{animation:none}
  .scroll-cue span::after{animation:none}
}

/* ===== Thème clair : surcharges des zones codées en dur ===== */
@media (prefers-color-scheme: light){
  body{background:radial-gradient(120% 100% at 50% 0%, #ffffff 0%, #eef1fa 60%) fixed}
  .noise-overlay{opacity:.05;mix-blend-mode:multiply}
  .grid-motif{
    background-image:
      linear-gradient(rgba(47,92,255,0.09) 1px, transparent 1px),
      linear-gradient(90deg, rgba(47,92,255,0.09) 1px, transparent 1px);
  }
  .site-header.scrolled{background:rgba(242,245,252,0.8)}
  .hero-vignette{
    background:linear-gradient(180deg, rgba(242,245,252,0) 0%, rgba(242,245,252,0.12) 70%, rgba(242,245,252,0.42) 100%);
  }
  .hero-title .line{
    background:linear-gradient(120deg, #12162a 30%, var(--blue) 100%);
    -webkit-background-clip:text;background-clip:text;
  }
  .scroll-cue span::after{background:var(--cyan)}

  .pillars{background:rgba(233,237,248,0.6)}
  .approche{background:rgba(233,237,248,0.6)}

  .pillar{
    background:linear-gradient(180deg, rgba(255,255,255,0.86), rgba(244,246,252,0.9));
  }
  .pillar-a{
    border-color:rgba(10,143,181,0.3);
    background:linear-gradient(160deg, rgba(47,92,255,0.14), rgba(10,143,181,0.08) 55%, rgba(255,255,255,0.9));
  }
  .pillar-a .pillar-tag{border-color:rgba(10,143,181,0.35)}
  .pillar-glow{opacity:.18}

  .service-card{
    background:linear-gradient(180deg, rgba(255,255,255,0.86), rgba(244,246,252,0.9));
  }
  .service-card:hover{border-color:rgba(10,143,181,0.32)}
  .sc-glow{opacity:.14}
  .service-card:hover .sc-glow{opacity:.26}

  .step{
    background:linear-gradient(180deg, rgba(255,255,255,0.72), rgba(244,246,252,0.8));
  }

  .why-card{
    background:linear-gradient(180deg, rgba(255,255,255,0.82), rgba(244,246,252,0.88));
  }

  .main-nav{background:transparent}
}
@media (prefers-color-scheme: light) and (max-width:900px){
  .main-nav{background:rgba(242,245,252,0.98)}
}