:root{
    --bg:#f2f0ec; --ink:#1d1d22; --muted:#6b6b73; --line:#d8d5ce;
    --accent:#2a4fd6; --card:#ffffff;
    --font:"Helvetica Neue",Arial,sans-serif;
  }
  @media (prefers-color-scheme:dark){
    :root{--bg:#16161a;--ink:#eceae4;--muted:#9a9aa3;--line:#2c2c33;--card:#1f1f25;--accent:#7b97ff}
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.6}
  a{color:inherit}
  :focus-visible{outline:3px solid var(--accent);outline-offset:3px}

  header.nav{position:sticky;top:0;z-index:10;background:var(--bg);border-bottom:1px solid var(--line);
    display:flex;justify-content:space-between;align-items:center;padding:14px 5vw;flex-wrap:wrap;gap:8px}
  .nav strong{font-size:1.05rem}
  .nav ul{display:flex;gap:20px;list-style:none;flex-wrap:wrap}
  .nav a{text-decoration:none;font-size:.95rem;color:var(--muted)}
  .nav a:hover{color:var(--accent)}

  section{padding:80px 5vw;max-width:1100px;margin:0 auto}
  section + section{border-top:1px solid var(--line)}
  h1{font-size:clamp(2.4rem,7vw,4.6rem);line-height:1.05;letter-spacing:-.02em;margin-bottom:20px}
  h2{font-size:clamp(1.6rem,4vw,2.2rem);margin-bottom:32px;letter-spacing:-.01em}
  h3{font-size:1.2rem;margin-bottom:6px}
  p{max-width:65ch}
  .muted{color:var(--muted)}

  .btn{display:inline-block;margin-top:24px;padding:12px 22px;background:var(--accent);color:#fff;
    text-decoration:none;border-radius:6px;font-weight:600;transition:transform .15s}
  .btn:hover{transform:translateY(-2px)}
  .btn.ghost{background:transparent;color:var(--accent);border:2px solid var(--accent);margin-top:14px;padding:8px 16px;font-size:.9rem}

  /* Parcours */
  .timeline{display:grid;gap:20px}
  .item{background:var(--card);border-left:5px solid var(--accent);padding:20px 24px;border-radius:4px}
  .item .when{font-size:.9rem;color:var(--muted)}

  /* Grilles */
  .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}
  .card{background:var(--card);border:1px solid var(--line);border-radius:6px;overflow:hidden}
  .card .ph{aspect-ratio:4/3;background:repeating-linear-gradient(45deg,var(--line),var(--line) 10px,transparent 10px,transparent 20px);
    display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:.9rem}
  .card .txt{padding:18px 20px}

  /* Planche SCAN */
  .planche{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:16px}
  .planche .ph{aspect-ratio:16/10;background:repeating-linear-gradient(45deg,var(--line),var(--line) 10px,transparent 10px,transparent 20px);
    display:flex;align-items:center;justify-content:center;color:var(--muted);text-align:center;padding:20px}
  .planche img{width:100%;height:auto;display:block}

  footer{text-align:center;padding:40px 5vw;color:var(--muted);border-top:1px solid var(--line);font-size:.9rem}
  @media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn{transition:none}}