:root{
  --bg:#0f1116;
  --bg-alt:#171a21;
  --surface:#1b1e26;
  --text:#f2efe7;
  --muted:#9aa0ad;
  --line:rgba(255,255,255,.09);
  --accent:#caa056;
  --accent-soft:rgba(202,160,86,.14);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}

/* nav */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(15,17,22,.82);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:1080px;margin:0 auto;padding:18px 28px;
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
}
.nav-brand{font-weight:800;letter-spacing:-.01em;font-size:.95rem}
.nav-links{display:flex;gap:22px;margin-left:auto;flex-wrap:wrap}
.nav-links a{
  font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);padding-bottom:2px;border-bottom:1px solid transparent;
  transition:color .15s,border-color .15s;
}
.nav-links a:hover,.nav-links a.active{color:var(--accent);border-color:var(--accent)}

/* hero (home only) */
.hero{
  position:relative;padding:120px 28px 84px;overflow:hidden;
  background:
    radial-gradient(ellipse 900px 500px at 18% 0%, rgba(202,160,86,.16), transparent 60%),
    var(--bg);
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:linear-gradient(180deg, transparent, rgba(0,0,0,.7) 40%, transparent 85%);
          mask-image:linear-gradient(180deg, transparent, rgba(0,0,0,.7) 40%, transparent 85%);
}
.hero-inner{position:relative;max-width:1080px;margin:0 auto}
.eyebrow{
  display:block;color:var(--muted);font-size:.78rem;letter-spacing:.2em;
  text-transform:uppercase;margin-bottom:22px;
}
.display{
  margin:0;font-weight:800;line-height:.98;letter-spacing:-.01em;
  font-size:clamp(3rem,9vw,6.4rem);
  color:transparent;-webkit-text-stroke:1.5px var(--accent);
  text-shadow:0 0 60px rgba(202,160,86,.18);
}
.display b{
  display:block;color:var(--text);-webkit-text-stroke:0;font-weight:800;
}
.lede{color:var(--muted);font-size:1.1rem;max-width:46ch;margin:26px 0 0}

/* generic page header (sub-pages) */
.pagehead{max-width:1080px;margin:0 auto;padding:76px 28px 8px}
.back{
  display:inline-flex;align-items:center;gap:6px;color:var(--muted);
  font-size:.82rem;margin-bottom:34px;transition:color .15s;
}
.back:hover{color:var(--accent)}
h1.title{
  margin:0 0 14px;font-weight:800;letter-spacing:-.01em;
  font-size:clamp(2.2rem,5.5vw,3.4rem);
  color:transparent;-webkit-text-stroke:1.2px var(--accent);
}
.subtitle{color:var(--muted);font-size:1.02rem;max-width:52ch;margin:0 0 46px}

/* sidebar layout (used on Mathématiques and Publications pages) */
.layout{
  max-width:1080px;margin:0 auto;padding:0 28px 100px;
  display:flex;gap:48px;align-items:flex-start;
}
.layout-nav{
  width:180px;flex:none;position:sticky;top:96px;
  display:flex;flex-direction:column;gap:2px;
}
.layout-nav a{
  font-size:.8rem;color:var(--muted);padding:8px 0 8px 16px;
  border-left:2px solid var(--line);transition:color .15s,border-color .15s;
}
.layout-nav a:hover{color:var(--accent);border-left-color:var(--accent)}
.layout-main{flex:1;min-width:0}

@media (max-width:760px){
  .layout{flex-direction:column;gap:8px}
  .layout-nav{
    position:static;width:100%;flex-direction:row;flex-wrap:wrap;gap:8px 14px;
    padding-bottom:20px;margin-bottom:8px;border-bottom:1px solid var(--line);
  }
  .layout-nav a{border-left:0;padding:6px 14px;border:1px solid var(--line);border-radius:99px}
}

/* tile grid */
.section{max-width:1080px;margin:0 auto;padding:0 28px 100px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:18px}

.tile{
  position:relative;display:flex;align-items:flex-end;aspect-ratio:4/3;
  width:100%;max-width:260px;margin:0;
  border-radius:4px;overflow:hidden;background:var(--bg-alt);
  border:1px solid var(--line);
  transition:transform .25s ease,border-color .25s ease;
}
.tile.is-link:hover{transform:translateY(-4px);border-color:var(--accent)}
.tile-wedge{
  position:absolute;inset:0;
  clip-path:polygon(38% 0,100% 0,100% 100%,0% 100%);
  background:linear-gradient(150deg,var(--c1),var(--c2));
  transition:filter .25s ease;
}
.tile-grain{
  position:absolute;inset:0;opacity:.5;mix-blend-mode:overlay;
  background-image:repeating-linear-gradient(115deg,rgba(255,255,255,.12) 0 1px,transparent 1px 7px);
}
.tile-thumb{
  position:absolute;top:10px;right:10px;width:42%;height:42%;object-fit:cover;
  border-radius:3px;border:1px solid rgba(255,255,255,.35);
  box-shadow:0 2px 6px rgba(0,0,0,.35);
}
.tile.is-link:hover .tile-wedge{filter:brightness(1.12)}
.tile.is-soon .tile-wedge{filter:grayscale(1) brightness(.6)}

.tile-body{position:relative;padding:16px 18px;width:100%}
.tile-title{font-size:.95rem;font-weight:800;letter-spacing:-.01em;margin-bottom:3px}
.tile-title .ext{font-size:.7em;color:var(--muted);font-weight:600;margin-left:2px}
.tile-desc{font-size:.72rem;color:var(--muted)}
.tile.is-soon .tile-title,.tile.is-soon .tile-desc{color:var(--muted)}

.tile-tag{
  position:absolute;top:12px;right:12px;font-size:.6rem;letter-spacing:.07em;
  text-transform:uppercase;color:var(--text);background:rgba(0,0,0,.45);
  border:1px solid var(--line);padding:3px 8px;border-radius:99px;
}

footer{
  max-width:1080px;margin:0 auto;padding:0 28px 56px;color:var(--muted);font-size:.8rem;
}

/* section grouping (used on Mathématiques and Publications pages) */
.group-title{
  font-size:1.5rem;font-weight:800;letter-spacing:-.01em;color:var(--text);
  margin:0 0 20px;padding-top:44px;border-top:1px solid var(--line);
  scroll-margin-top:90px;
}
.group-title:first-of-type{padding-top:0;border-top:0}

.inline-link{color:var(--accent);border-bottom:1px solid transparent;transition:border-color .15s}
.inline-link:hover{border-bottom-color:var(--accent)}

/* publications grid */
.pub-level{
  font-size:.8rem;font-weight:700;color:var(--accent);text-transform:uppercase;
  letter-spacing:.1em;margin:30px 0 14px;
}
.pub-level:first-of-type{margin-top:0}
.pub-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:20px;
}
.pub-card{
  display:flex;flex-direction:column;background:var(--bg-alt);
  border:1px solid var(--line);border-radius:4px;overflow:hidden;
  transition:transform .25s ease,border-color .25s ease;
}
.pub-card:hover{transform:translateY(-4px);border-color:var(--accent)}
.pub-cover{aspect-ratio:2/3;background:#fff;display:flex;align-items:center;justify-content:center}
.pub-cover img{width:100%;height:100%;object-fit:contain}
.pub-info{padding:12px 14px 16px}
.pub-title{font-size:.86rem;font-weight:700;line-height:1.3}

/* map embed */
.map-embed{
  border-radius:4px;overflow:hidden;border:1px solid var(--line);
  background:var(--bg-alt);aspect-ratio:16/10;
}
.map-embed iframe{width:100%;height:100%;border:0;display:block}

.soon-wrap{
  max-width:1080px;margin:0 auto;min-height:56vh;
  display:flex;flex-direction:column;justify-content:center;padding:0 28px;
}