:root{
    --page:#FFFFFF;
    --ink:#12181F;
    --ink-muted:#4E5A66;
    --panel:#1B222B;
    --panel-2:#232C37;
    --line:#E1E5E9;
    --line-dark:#323D48;
    --on-dark:#E7EDF3;
    --on-dark-muted:#93A2AF;
    --cyan:#00E5FF;
    --blue:#0014A8;
    --t1:#0014A8;
    --t2:#0B3FC4;
    --t3:#00A8D6;
    --t4:#00E5FF;
    --sans: 'IBM Plex Sans', system-ui, sans-serif;
    --display: 'Space Grotesk', system-ui, sans-serif;
    --mono: 'IBM Plex Mono', monospace;
  }
  *{box-sizing:border-box; margin:0; padding:0;}
  html{scroll-behavior:smooth;}
  body{
    background:var(--page);
    color:var(--ink);
    font-family:var(--sans);
    line-height:1.55;
    -webkit-font-smoothing:antialiased;
    text-align:justify;
  }
  @media (prefers-reduced-motion: reduce){
    html{scroll-behavior:auto;}
    *{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
  }
  a{color:inherit; text-decoration:none;}
  img,svg{display:block; max-width:100%;}
  .wrap{max-width:1120px; margin:0 auto; padding:0 28px;}
  section{padding:96px 0;}
  h1,h2,h3{font-family:var(--display); font-weight:600; letter-spacing:-0.01em; text-align:left;}
  h2{font-size:clamp(28px,3.4vw,40px); max-width:20ch;}
  h3{font-size:19px; font-weight:600;}
  p{color:var(--ink-muted); font-size:16px;}
  .lede{color:var(--ink); font-size:18px; max-width:58ch;}

  :focus-visible{outline:2px solid var(--cyan); outline-offset:3px;}

  /* thermal gradient utility */
  .thermal-text{
    background:linear-gradient(90deg,var(--t1),var(--t2) 38%,var(--t3) 68%,var(--t4));
    -webkit-background-clip:text; background-clip:text; color:transparent;
  }
  .thermal-rule{
    height:3px; width:64px;
    background:linear-gradient(90deg,var(--t1),var(--t2),var(--t3),var(--t4));
    border-radius:2px;
  }

  /* header — dark panel bar contrasting with the white page */
  header{
    position:sticky; top:0; z-index:50;
    background:rgba(27,34,43,0.92); backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line-dark);
  }
  header .bar{display:flex; align-items:center; justify-content:space-between; padding:12px 28px;}
  .brand{display:flex; align-items:center;}
  .brand img{height:44px; width:auto; display:block;}
  .footer-logo{height:32px; width:auto; display:block; opacity:0.85;}
  nav{display:flex; gap:32px;}
  nav a{font-size:14.5px; color:var(--on-dark-muted); transition:color .15s;}
  nav a:hover{color:var(--on-dark);}
  .call{
    font-family:var(--mono); font-size:14px; color:var(--on-dark);
    border:1px solid var(--line-dark); padding:9px 16px; border-radius:3px;
    transition:border-color .15s;
  }
  .call:hover{border-color:var(--cyan);}
  .menu-btn{display:none; background:none; border:0; color:var(--on-dark); font-size:24px;}

  /* hero — on the white page */
  .hero{padding:88px 0 64px; position:relative; overflow:hidden;}
  .hero-solo{max-width:760px; margin:0 auto;}
  .hero-carousel{padding-top:0; padding-bottom:56px;}
  .kicker{font-family:var(--mono); font-size:13px; color:var(--blue); margin-bottom:18px; text-align:center;}
  .hero h1{font-size:clamp(34px,5vw,54px); line-height:1.08; margin-bottom:22px; text-align:center;}
  .hero .lede{margin-bottom:34px; text-align:center; margin-left:auto; margin-right:auto;}
  .cta-row{display:flex; gap:14px; flex-wrap:wrap;}
  .btn{
    font-family:var(--sans); font-weight:600; font-size:15px;
    padding:13px 24px; border-radius:3px; display:inline-block;
  }
  .btn-primary{background:var(--blue); color:#fff; border:1px solid var(--blue); transition:background .15s, border-color .15s;}
  .btn-primary:hover{background:#000d80; border-color:var(--cyan);}
  .btn-ghost{border:1px solid rgba(18,24,31,0.24); color:var(--ink);}
  .btn-ghost:hover{border-color:var(--blue); color:var(--blue);}

  /* clients strip — continuous scrolling marquee */
  .strip{border-top:1px solid var(--line); border-bottom:1px solid var(--line); padding:26px 0; overflow:hidden;}
  .marquee{overflow:hidden; -webkit-mask-image:linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image:linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);}
  .marquee-track{
    display:flex; align-items:center; gap:48px; width:max-content;
    animation:marquee-scroll 22s linear infinite;
  }
  .strip span{font-family:var(--mono); font-size:13px; color:var(--ink-muted); white-space:nowrap;}
  @keyframes marquee-scroll{
    from{transform:translateX(0);}
    to{transform:translateX(-50%);}
  }
  @media (prefers-reduced-motion: reduce){
    .marquee-track{animation:none;}
    .marquee{overflow-x:auto;}
  }

  /* section label */
  .label{font-family:var(--mono); font-size:13px; color:var(--ink-muted); margin-bottom:10px;}
  .section-head{display:flex; justify-content:space-between; align-items:flex-end; gap:24px; margin-bottom:52px; flex-wrap:wrap;}
  .section-head p{max-width:38ch;}

  /* "pourquoi" intro — boxed on a distinctive dark panel */
  #pourquoi .section-head{
    background:var(--panel); border-radius:10px; padding:36px 40px;
  }
  #pourquoi .section-head .label{color:var(--on-dark-muted);}
  #pourquoi .section-head h2{color:var(--on-dark);}
  #pourquoi .section-head p{color:var(--on-dark-muted);}
  @media (max-width: 640px){
    #pourquoi .section-head{padding:28px 24px;}
  }

  /* "pourquoi passer par un drone" — one shared boxed zone */
  .drone-panel{
    background:var(--panel); border-radius:10px; padding:36px 40px;
  }
  .drone-panel h3{color:var(--on-dark); margin-bottom:16px;}
  .drone-panel .two-col{column-gap:40px; row-gap:0;}
  .drone-panel .advlist li{color:var(--on-dark); border-bottom:1px solid var(--line-dark);}
  .drone-panel .advlist li:last-child{border-bottom:none;}
  @media (max-width: 640px){
    .drone-panel{padding:28px 24px;}
  }

  /* why control - inline flag list, dark chips on the white page */
  .flags{display:flex; flex-wrap:wrap; gap:10px 14px; margin-top:28px;}
  .flags span{
    font-size:14px; color:var(--on-dark); background:var(--panel);
    border:1px solid var(--panel); padding:7px 14px; border-radius:20px;
  }

  /* services - varied layout, not identical cards */
  .service{
    display:grid; grid-template-columns:260px 1fr; gap:40px;
    padding:38px 0; border-top:1px solid var(--line);
  }
  .service:last-child{border-bottom:1px solid var(--line);}
  .service .num{font-family:var(--mono); color:var(--blue); font-size:14px;}
  .service h3{margin-top:6px; font-size:22px;}
  .service-thumb{
    margin-top:16px; border-radius:8px; overflow:hidden; aspect-ratio:4/3;
    background:var(--panel);
  }
  .service-thumb img{width:100%; height:100%; object-fit:cover; display:block;}
  .service-body p{font-weight:700; color:var(--ink);}
  .service-body ul{list-style:none; margin-top:16px; display:grid; grid-template-columns:1fr; gap:8px;}
  .service-body li{font-size:14.5px; color:var(--ink-muted); padding-left:16px; position:relative;}
  .service-body li::before{content:"—"; position:absolute; left:0; color:var(--blue);}

  /* why drone - two column */
  .two-col{display:grid; grid-template-columns:1fr 1fr; gap:60px;}
  .advlist{list-style:none; display:flex; flex-direction:column; gap:0;}
  .advlist li{
    padding:16px 0; border-bottom:1px solid var(--line);
    display:flex; gap:16px; font-size:15px; color:var(--ink);
  }
  .advlist li:first-child{padding-top:0;}
  .advlist li::before{content:""; width:6px; height:6px; margin-top:8px; border-radius:1px; background:var(--blue); flex-shrink:0;}

  /* process - real sequence */
  .process{display:grid; grid-template-columns:repeat(4,1fr); gap:0; position:relative;}
  .process::before{
    content:""; position:absolute; top:22px; left:0; right:0; height:1px;
    background:var(--line);
  }
  .step{position:relative; padding-top:56px;}
  .step .marker{
    position:absolute; top:0; left:0; width:44px; height:44px; border-radius:50%;
    background:var(--page); border:1px solid var(--line);
    display:flex; align-items:center; justify-content:center;
    font-family:var(--mono); font-size:13px; color:var(--blue); z-index:2;
  }
  .step h3{font-size:17px; margin-bottom:8px;}
  .step p{font-size:14px;}

  /* portfolio carousel — dark slides/controls standing out from the white page */
  .carousel-wrap{position:relative;}
  .carousel{display:flex; align-items:center; gap:16px;}
  .car-viewport{flex:1; overflow:hidden; border-radius:8px;}
  .car-track{display:flex; transition:transform .45s ease;}
  .car-slide{
    flex:0 0 100%; position:relative; aspect-ratio:27/8;
    background:var(--panel); border:1px solid var(--panel); border-radius:8px; overflow:hidden;
  }
  .car-slide img{width:100%; height:100%; object-fit:cover; display:block;}
  .car-loading{
    display:flex; align-items:center; justify-content:center;
    color:var(--on-dark-muted); font-family:var(--mono); font-size:14px; min-height:280px;
  }
  .car-caption{
    position:absolute; left:0; right:0; bottom:0; padding:22px 26px;
    background:linear-gradient(0deg, rgba(6,9,13,0.88), rgba(6,9,13,0));
  }
  .car-caption .cat{font-family:var(--mono); font-size:12px; color:var(--t4); margin-bottom:6px;}
  .car-caption h3{color:#fff; font-size:19px;}
  .car-btn{
    flex:0 0 auto; width:44px; height:44px; border-radius:50%;
    background:var(--panel); border:1px solid var(--panel); color:var(--on-dark);
    font-size:22px; line-height:1; cursor:pointer; transition:border-color .15s, color .15s;
  }
  .car-btn:hover{border-color:var(--cyan); color:var(--cyan);}
  .car-dots{display:flex; justify-content:center; gap:8px; margin-top:20px;}
  .car-dots button{
    width:8px; height:8px; border-radius:50%; border:0; padding:0;
    background:var(--line); cursor:pointer; transition:background .15s;
  }
  .car-dots button.active{background:var(--blue);}
  @media (max-width: 640px){
    .car-btn{width:36px; height:36px; font-size:18px;}
  }

  /* audience */
  .audience{display:flex; flex-wrap:wrap; gap:0; border-top:1px solid var(--line); border-left:1px solid var(--line);}
  .aud-item{
    flex:1 1 200px; padding:26px 24px; border-right:1px solid var(--line); border-bottom:1px solid var(--line);
  }
  .aud-item h3{font-size:16px; font-weight:500;}

  /* about */
  .about-grid{display:grid; grid-template-columns:0.9fr 1.1fr; gap:60px; align-items:center;}
  .about-grid p + p{margin-top:14px;}
  .stat-row{display:flex; gap:44px; margin-top:34px;}
  .stat b{display:block; font-family:var(--display); font-size:30px; color:var(--ink);}
  .stat span{font-size:13px; color:var(--ink-muted);}

  /* contact — dark panel standing out from the white page */
  .contact-wrap{
    background:var(--panel); border:1px solid var(--panel); border-radius:8px;
    padding:56px; display:grid; grid-template-columns:1fr 1fr; gap:56px;
  }
  .contact-wrap h2{margin-bottom:14px; color:var(--on-dark);}
  .contact-wrap > div > p{color:var(--on-dark-muted);}
  .field{margin-bottom:18px;}
  .field label{display:block; font-size:13px; color:var(--on-dark-muted); margin-bottom:7px; font-family:var(--mono);}
  .field input, .field textarea{
    width:100%; background:var(--page); border:1px solid var(--line); border-radius:3px;
    color:var(--ink); padding:12px 14px; font-family:var(--sans); font-size:15px;
  }
  .field input:focus, .field textarea:focus{border-color:var(--cyan); outline:none;}
  .field textarea{min-height:100px; resize:vertical;}
  .contact-info{border-left:1px solid var(--line-dark); padding-left:56px;}
  .contact-info .item{margin-bottom:26px;}
  .contact-info .item span{display:block; font-size:13px; color:var(--on-dark-muted); font-family:var(--mono); margin-bottom:4px;}
  .contact-info .item a, .contact-info .item div{font-size:17px; color:var(--on-dark);}

  footer{border-top:1px solid var(--line); padding:34px 0;}
  footer .wrap{display:flex; justify-content:space-between; flex-wrap:wrap; gap:14px;}
  footer p{font-size:13px; color:var(--ink-muted);}

  /* prestations — 4 theme cards linking to dedicated pages */
  .prestations-grid{display:grid; grid-template-columns:repeat(4,1fr); gap:20px;}
  .prestation-card{
    background:var(--panel); border-radius:10px; padding:22px;
    display:flex; flex-direction:column; border:1px solid var(--panel);
    transition:border-color .15s, transform .15s;
  }
  .prestation-card:hover{border-color:var(--cyan); transform:translateY(-2px);}
  .prestation-card h3{color:var(--on-dark); font-size:17px; margin-bottom:14px;}
  .prestation-card ul{list-style:none; margin-bottom:18px; flex:1;}
  .prestation-card li{
    color:var(--on-dark-muted); font-size:14px; padding-left:14px; position:relative; margin-bottom:8px;
  }
  .prestation-card li::before{content:"—"; position:absolute; left:0; color:var(--cyan);}
  .prestation-card .prestation-thumb{
    aspect-ratio:4/3; border-radius:6px; overflow:hidden; background:var(--panel-2);
  }
  .prestation-card .prestation-thumb img{width:100%; height:100%; object-fit:cover; display:block;}
  .prestation-card .prestation-more{
    margin-top:16px; font-family:var(--mono); font-size:13px; color:var(--cyan);
  }

  /* dedicated theme pages */
  .page-hero{padding:64px 0 48px; border-bottom:1px solid var(--line);}
  .page-hero .label{margin-bottom:14px;}
  .page-hero h1{font-size:clamp(30px,4.4vw,46px); line-height:1.1; max-width:20ch;}
  .page-hero .lede{margin-top:18px; text-align:left;}
  .page-gallery{display:grid; grid-template-columns:1fr 1fr; gap:20px; margin-top:40px;}
  .page-gallery .thumb{aspect-ratio:4/3; border-radius:8px; overflow:hidden; background:var(--panel);}
  .page-gallery .thumb img{width:100%; height:100%; object-fit:cover; display:block;}
  .page-detail-list{list-style:none; margin-top:28px; max-width:640px;}
  .page-detail-list li{
    padding:16px 0; border-top:1px solid var(--line);
    font-size:15.5px; color:var(--ink-muted); padding-left:18px; position:relative;
  }
  .page-detail-list li:last-child{border-bottom:1px solid var(--line);}
  .page-detail-list li::before{content:"—"; position:absolute; left:0; color:var(--blue);}
  .page-detail-list strong{color:var(--ink); font-weight:700;}
  .page-cta{
    margin-top:48px; background:var(--panel); border-radius:10px; padding:36px 40px;
    display:flex; justify-content:space-between; align-items:center; gap:24px; flex-wrap:wrap;
  }
  .page-cta h3{color:var(--on-dark); font-size:20px;}
  .page-cta p{color:var(--on-dark-muted); margin-top:6px;}

  @media (max-width: 860px){
    section{padding:64px 0;}
    .two-col, .about-grid, .contact-wrap{grid-template-columns:1fr;}
    .contact-info{border-left:none; padding-left:0; border-top:1px solid var(--line-dark); padding-top:28px;}
    .prestations-grid{grid-template-columns:1fr 1fr;}
    .page-gallery{grid-template-columns:1fr;}
    nav{position:fixed; top:66px; left:0; right:0; background:var(--panel); flex-direction:column; padding:20px 28px; border-bottom:1px solid var(--line-dark); display:none;}
    nav.open{display:flex;}
    .menu-btn{display:block;}
    .call{display:none;}
  }
  @media (max-width: 560px){
    .prestations-grid{grid-template-columns:1fr;}
  }

/* back-to-top floating button */
.back-to-top{
  position:fixed; right:24px; bottom:24px; z-index:60;
  width:46px; height:46px; border-radius:50%;
  background:var(--blue); color:#fff; border:1px solid var(--blue);
  display:flex; align-items:center; justify-content:center;
  font-size:20px; line-height:1; cursor:pointer;
  box-shadow:0 4px 14px rgba(0,20,168,0.35);
  opacity:0; visibility:hidden; transform:translateY(8px);
  transition:opacity .2s ease, transform .2s ease, visibility .2s, border-color .15s;
}
.back-to-top.visible{opacity:1; visibility:visible; transform:translateY(0);}
.back-to-top:hover{border-color:var(--cyan);}
@media (max-width:640px){
  .back-to-top{right:16px; bottom:16px; width:42px; height:42px; font-size:18px;}
}