/* Route des Lasers — independent photonics-cluster resource
   Palette: deep navy + laser teal/cyan + coral accent. Space Grotesk / Source Sans 3.
   Content is visible with CSS alone — no visibility gated on JS. */

:root{
  --navy:#0a2540; --navy-700:#0e2f52; --navy-600:#143a63;
  --teal:#00b3b3; --teal-bright:#12d0cf; --teal-dark:#008a8a;
  --coral:#e4572e; --coral-dark:#c8431d;
  --ink:#17222e; --muted:#54677a; --faint:#8798a6;
  --bg:#ffffff; --bg-alt:#f1f6f8; --bg-alt2:#e9f1f4; --line:#dde7ec;
  --radius:14px; --radius-sm:10px;
  --shadow:0 10px 30px -12px rgba(10,37,64,.28);
  --shadow-sm:0 4px 14px -8px rgba(10,37,64,.35);
  --measure:44rem;
  --maxw:1160px;
  --font-head:'Space Grotesk',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --font-body:'Source Sans 3',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; font-family:var(--font-body); color:var(--ink);
  background:var(--bg); line-height:1.72; font-size:1.06rem;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
img{max-width:100%; height:auto; display:block}
a{color:var(--teal-dark); text-decoration:none}
a:hover{color:var(--coral); text-decoration:underline; text-underline-offset:3px}

/* Safeguard: never leave content hidden waiting on JS */
[data-aos]{opacity:1 !important; transform:none !important}

/* ---------- Header / nav ---------- */
.site-header{
  position:sticky; top:0; z-index:50; background:var(--navy);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.nav-wrap{
  max-width:var(--maxw); margin:0 auto; padding:.55rem 1.2rem;
  display:flex; align-items:center; gap:1rem; flex-wrap:wrap;
}
.brand{display:flex; align-items:center; gap:.6rem; color:#fff; font-family:var(--font-head); font-weight:600; font-size:1.18rem; letter-spacing:.2px}
.brand:hover{text-decoration:none; color:#fff}
.brand .beam{width:26px; height:26px; flex:0 0 auto}
.brand b{color:var(--teal-bright); font-weight:700}
.brand small{display:block; font-family:var(--font-body); font-weight:400; font-size:.62rem; letter-spacing:.14em; text-transform:uppercase; color:var(--faint); margin-top:-2px}

.nav-toggle{margin-left:auto; display:none; background:transparent; border:1px solid rgba(255,255,255,.25); color:#fff; padding:.4rem .6rem; border-radius:8px; font-size:1.1rem; cursor:pointer}
.nav{margin-left:auto; display:flex; flex-wrap:wrap; gap:.15rem; align-items:center}
.nav a{
  color:#d5e3ee; font-size:.92rem; font-weight:500; padding:.45rem .68rem;
  border-radius:8px; letter-spacing:.1px; white-space:nowrap;
}
.nav a:hover{color:#fff; background:var(--navy-600); text-decoration:none}
.nav a.active{color:var(--navy); background:var(--teal-bright)}

/* ---------- Hero / page header ---------- */
.page-hero{position:relative; background:var(--navy); color:#fff; overflow:hidden}
.page-hero .hero-img{
  position:absolute; inset:0; width:100%; height:100%; object-fit:cover; opacity:.42;
}
.page-hero::after{
  content:""; position:absolute; inset:0;
  background:
    linear-gradient(115deg, rgba(10,37,64,.92) 12%, rgba(10,37,64,.55) 60%, rgba(0,138,138,.35) 100%),
    linear-gradient(180deg, rgba(10,37,64,.2), rgba(10,37,64,.85));
}
.hero-inner, .band-inner{position:relative; z-index:2; max-width:var(--maxw); margin:0 auto; padding:4.2rem 1.2rem 3.4rem}
.page-hero .hero-inner{padding-top:5rem; padding-bottom:4.2rem}
.eyebrow{
  display:inline-flex; align-items:center; gap:.5rem; font-family:var(--font-head);
  font-size:.72rem; font-weight:600; letter-spacing:.2em; text-transform:uppercase;
  color:var(--teal-bright); margin:0 0 .9rem;
}
.eyebrow::before{content:""; width:26px; height:2px; background:var(--teal-bright); display:inline-block}
h1{font-family:var(--font-head); font-weight:700; line-height:1.1; margin:0; letter-spacing:-.5px;
  font-size:clamp(1.9rem,4.4vw,3rem); max-width:20ch}
.page-hero h1{color:#fff; max-width:22ch}
.hero-lede{margin:1.2rem 0 0; font-size:1.14rem; color:#cfe0ec; max-width:52ch}

.page-band{background:linear-gradient(120deg,var(--navy),var(--navy-700)); color:#fff; position:relative}
.page-band::before{
  content:""; position:absolute; inset:0; opacity:.5;
  background:radial-gradient(120% 140% at 88% -10%, rgba(0,179,179,.5), transparent 45%);
}
.page-band h1{color:#fff}

/* ---------- Layout ---------- */
main{display:block}
.article{max-width:var(--measure); margin:0 auto; padding:3rem 1.2rem 3.5rem}
.article > p:first-of-type{font-size:1.18rem; color:#2a3947; line-height:1.7}
.article h2{
  font-family:var(--font-head); font-weight:600; font-size:1.5rem; line-height:1.25;
  margin:2.4rem 0 .6rem; color:var(--navy); letter-spacing:-.2px; position:relative; padding-top:.4rem;
}
.article h2::before{content:""; position:absolute; top:-.2rem; left:0; width:38px; height:3px; background:var(--teal); border-radius:2px}
.article h3{font-family:var(--font-head); font-weight:600; font-size:1.16rem; color:var(--navy-700); margin:1.6rem 0 .4rem}
.article p{margin:0 0 1.05rem}
.article ul,.article ol{margin:0 0 1.2rem; padding-left:1.3rem}
.article li{margin:.35rem 0}
.article strong{color:var(--navy)}
.article a{border-bottom:1px solid rgba(0,138,138,.32)}
.article a:hover{border-bottom-color:var(--coral)}

/* pill note */
.note{
  background:var(--bg-alt); border:1px solid var(--line); border-left:4px solid var(--teal);
  border-radius:var(--radius-sm); padding:1rem 1.2rem; margin:1.8rem 0; font-size:.98rem; color:var(--muted);
}

/* ---------- Home extras ---------- */
.section{max-width:var(--maxw); margin:0 auto; padding:2.6rem 1.2rem}
.section.alt{background:var(--bg-alt)}
.full-alt{background:var(--bg-alt); border-top:1px solid var(--line); border-bottom:1px solid var(--line)}
.cards{display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:1.1rem; margin-top:1.6rem}
.card{
  background:var(--bg); border:1px solid var(--line); border-radius:var(--radius); padding:1.35rem 1.3rem;
  box-shadow:var(--shadow-sm); transition:transform .18s ease, box-shadow .18s ease;
}
.card:hover{transform:translateY(-4px); box-shadow:var(--shadow)}
.card .k{font-family:var(--font-head); font-size:.72rem; letter-spacing:.16em; text-transform:uppercase; color:var(--teal-dark); font-weight:600}
.card h3{font-family:var(--font-head); margin:.35rem 0 .5rem; color:var(--navy); font-size:1.2rem}
.card p{margin:0 0 .8rem; color:var(--muted); font-size:.96rem}
.card a{font-weight:600; font-size:.94rem}
.section-head{max-width:var(--measure)}
.section-head h2{font-family:var(--font-head); color:var(--navy); font-size:1.7rem; margin:.2rem 0 .5rem; letter-spacing:-.3px}
.section-head .eyebrow{color:var(--teal-dark)}
.section-head p{color:var(--muted); margin:0}

/* contact form (a-propos) */
.contact-form{display:grid; gap:.9rem; max-width:34rem; margin:1.4rem 0 0}
.contact-form label{display:grid; gap:.3rem; font-weight:600; color:var(--navy); font-size:.92rem}
.contact-form input,.contact-form textarea{
  font-family:inherit; font-size:1rem; padding:.7rem .8rem; border:1px solid var(--line);
  border-radius:var(--radius-sm); background:var(--bg-alt); color:var(--ink);
}
.contact-form input:focus,.contact-form textarea:focus{outline:2px solid var(--teal); border-color:var(--teal); background:#fff}
.contact-form button{
  justify-self:start; background:var(--teal-dark); color:#fff; border:0; font-weight:600; font-family:var(--font-head);
  padding:.7rem 1.5rem; border-radius:999px; cursor:pointer; font-size:1rem; transition:background .16s ease}
.contact-form button:hover{background:var(--coral)}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy); color:#c3d3df; margin-top:2rem}
.footer-top{max-width:var(--maxw); margin:0 auto; padding:3rem 1.2rem 2rem; display:grid; grid-template-columns:1.4fr 1fr 1fr; gap:2rem}
.footer-brand .brand{margin-bottom:.8rem}
.footer-brand p{font-size:.92rem; color:#9fb4c4; max-width:42ch}
.footer col, .fcol h4{margin:0}
.fcol h4{font-family:var(--font-head); color:#fff; font-size:.82rem; letter-spacing:.14em; text-transform:uppercase; margin:0 0 .8rem}
.fcol ul{list-style:none; margin:0; padding:0}
.fcol li{margin:.32rem 0}
.fcol a{color:#c3d3df; font-size:.93rem}
.fcol a:hover{color:var(--teal-bright); text-decoration:none}
.footer-note{border-top:1px solid rgba(255,255,255,.1); background:var(--navy-700)}
.footer-note-inner{max-width:var(--maxw); margin:0 auto; padding:1.1rem 1.2rem; font-size:.82rem; color:#8ea6b8; display:flex; justify-content:space-between; gap:1rem; flex-wrap:wrap}
.footer-note-inner .disclaimer{max-width:66ch}

/* ---------- Responsive ---------- */
@media (max-width:860px){
  .footer-top{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:720px){
  .nav-toggle{display:block}
  .nav{display:none; flex-direction:column; align-items:stretch; width:100%; gap:.1rem; margin:.5rem 0 .2rem; order:3}
  .nav a{padding:.7rem .8rem; border-radius:8px}
  #nav-check:checked ~ .nav{display:flex}
  .footer-top{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto; transition:none !important}
}