/* ═══════════════════════════════════════════════════════════
   Références — Écosystème Portemann · charte unique
   Ardoise profonde, encre claire, or — le laboratoire et le cahier.
   ═══════════════════════════════════════════════════════════ */
:root {
  --bg:      #10151f;
  --bg-2:    #161d2b;
  --panel:   #1b2434;
  --panel-2: #202b3f;
  --ink:     #ece7da;
  --ink-dim: #a7b0c2;
  --gold:    #c9a45c;
  --gold-2:  #e5c98c;
  --line:    rgba(201,164,92,0.22);
  --teal:    #5ea8a0;
  --blue:    #6d9dc5;
  --red:     #c96a5e;
  --green:   #7fb069;
  --violet:  #9b8cc9;
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family:'Inter', system-ui, sans-serif;
  font-weight:300; line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
.wrap { max-width:1120px; margin:0 auto; padding:0 24px; }
a { color:var(--gold-2); text-decoration:none; }
a:hover { color:var(--gold); }
.display { font-family:'Cormorant Garamond', Georgia, serif; font-weight:500; }
.gold { color:var(--gold); }
.muted { color:var(--ink-dim); }
.mono { font-family:ui-monospace, 'SF Mono', Menlo, monospace; font-size:0.78rem; }
.h2 { font-size:1.7rem; margin:42px 0 18px; }
.h3 { font-size:1.2rem; margin:30px 0 10px; color:var(--gold-2); }
.overline { font-size:0.7rem; letter-spacing:0.32em; text-transform:uppercase; color:var(--gold); font-weight:500; }
.hairline { height:1px; margin:26px auto 0; max-width:120px;
  background:linear-gradient(90deg, transparent, rgba(201,164,92,0.6), transparent); }

/* ── En-tête ── */
.site-header {
  position:sticky; top:0; z-index:50;
  background:rgba(16,21,31,0.94); backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.bar { display:flex; align-items:center; justify-content:space-between; height:66px; gap:20px; }
.brand { display:flex; align-items:center; gap:12px; color:var(--ink); }
.brand:hover { color:var(--gold-2); }
.brand-mark { width:30px; height:30px; color:var(--gold); flex-shrink:0; }
.brand-name { font-family:'Cormorant Garamond', serif; font-size:1.3rem; display:block; line-height:1.1; }
.brand-sub { font-size:0.62rem; letter-spacing:0.18em; text-transform:uppercase; color:var(--ink-dim); display:block; }
.search input {
  background:var(--bg-2); border:1px solid var(--line); border-radius:999px;
  padding:8px 18px; color:var(--ink); font-family:'Inter',sans-serif; font-size:0.82rem; width:230px; outline:none;
}
.search input:focus { border-color:var(--gold); }
.nav-toggle { display:none; background:none; border:1px solid var(--line); border-radius:10px; color:var(--gold); padding:6px 12px; font-size:1rem; cursor:pointer; }

.site-nav { border-top:1px solid rgba(201,164,92,0.10); }
.site-nav ul { display:flex; gap:4px; flex-wrap:wrap; list-style:none; }
.site-nav a {
  display:block; padding:10px 14px; font-size:0.74rem; letter-spacing:0.14em;
  text-transform:uppercase; color:var(--ink-dim); border-bottom:2px solid transparent;
}
.site-nav a:hover { color:var(--gold-2); }
.site-nav a.actif { color:var(--gold); border-bottom-color:var(--gold); }

/* ── Hero ── */
.hero {
  padding:88px 0 64px; text-align:center;
  background:
    radial-gradient(ellipse 70% 60% at 50% 0%, rgba(201,164,92,0.09), transparent),
    radial-gradient(ellipse 50% 45% at 85% 110%, rgba(109,157,197,0.07), transparent);
}
.hero-home { padding:120px 0 90px; }
.hero h1 { font-size:clamp(2.4rem,5.5vw,3.6rem); margin:14px 0 16px; }
.hero .sub { color:var(--ink-dim); font-size:0.98rem; max-width:680px; margin:0 auto; }

.section { padding:44px 0; }

/* ── Statistiques ── */
.stats-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.stat {
  border:1px solid var(--line); border-radius:14px; background:var(--panel);
  padding:26px 22px; text-align:center; color:var(--ink);
  transition:all .25s; display:flex; flex-direction:column; gap:6px;
}
.stat:hover { transform:translateY(-3px); border-color:rgba(201,164,92,0.55); }
.stat-n { font-family:'Cormorant Garamond',serif; font-size:2.4rem; color:var(--gold); line-height:1; }
.stat-l { font-size:0.72rem; letter-spacing:0.14em; text-transform:uppercase; color:var(--ink-dim); }

/* ── Cartes ── */
.grid-2 { display:grid; grid-template-columns:1fr 1fr; gap:20px; }
.grid-3 { display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.card {
  border:1px solid var(--line); border-radius:14px; background:var(--panel);
  padding:26px 24px; display:flex; flex-direction:column; gap:10px;
  transition:all .25s; color:var(--ink);
}
a.card:hover, .card-lien:hover { transform:translateY(-3px); border-color:rgba(201,164,92,0.55); }
.card h3 { font-family:'Cormorant Garamond',serif; font-size:1.35rem; font-weight:600; }
.card p { color:var(--ink-dim); font-size:0.86rem; }
.card .meta { font-size:0.68rem; letter-spacing:0.16em; text-transform:uppercase; color:var(--gold); }
.card .tagline { color:var(--ink); font-style:italic; }
.card .lien { font-size:0.78rem; letter-spacing:0.08em; }

/* ── Badges ── */
.badge {
  display:inline-block; font-size:0.66rem; letter-spacing:0.12em; text-transform:uppercase;
  padding:3px 12px; border-radius:999px; border:1px solid; font-weight:500; white-space:nowrap;
}
.b-discret    { color:var(--gold-2); border-color:rgba(201,164,92,0.5); }
.b-continu    { color:var(--blue);   border-color:rgba(109,157,197,0.5); }
.b-formalisme { color:var(--teal);   border-color:rgba(94,168,160,0.5); }
.b-neutre     { color:var(--ink-dim); border-color:rgba(167,176,194,0.4); }
.v-demontre   { color:var(--green);  border-color:rgba(127,176,105,0.55); }
.v-confirme   { color:var(--teal);   border-color:rgba(94,168,160,0.55); }
.v-etabli     { color:var(--blue);   border-color:rgba(109,157,197,0.55); }
.v-partiel    { color:var(--gold-2); border-color:rgba(201,164,92,0.55); }
.v-conjecture { color:var(--violet); border-color:rgba(155,140,201,0.55); }
.v-neutre     { color:var(--ink-dim); border-color:rgba(167,176,194,0.4); }

/* ── Listes / fiches ── */
.liste { display:flex; flex-direction:column; gap:14px; margin-top:24px; }
.ligne {
  border:1px solid var(--line); border-radius:14px; background:var(--panel);
  padding:22px 26px; transition:border-color .25s;
}
.ligne:hover { border-color:rgba(201,164,92,0.45); }
.ligne h3 { font-family:'Cormorant Garamond',serif; font-size:1.25rem; font-weight:600; margin-bottom:8px; }
.ligne h3 a { color:var(--ink); }
.ligne h3 a:hover { color:var(--gold-2); }
.ligne p { color:var(--ink-dim); font-size:0.87rem; margin-bottom:6px; }
.ligne p strong { color:var(--ink); font-weight:500; }
.ligne .meta { font-size:0.72rem; color:var(--ink-dim); letter-spacing:0.04em; margin-top:8px; }
.code { color:var(--gold); font-family:ui-monospace, Menlo, monospace; font-size:0.95em; }

.fiche {
  border:1px solid var(--line); border-radius:16px; background:var(--panel);
  padding:32px 34px; margin-bottom:22px;
}
.fiche-head { display:flex; justify-content:space-between; align-items:flex-start; gap:18px; flex-wrap:wrap; margin-bottom:14px; }
.fiche-head h2 { font-size:1.6rem; }
.fiche .def { font-size:0.95rem; color:var(--ink); margin-bottom:14px; }
.fiche h4 { font-size:0.72rem; letter-spacing:0.22em; text-transform:uppercase; color:var(--gold); margin:16px 0 8px; }
.fiche ul { list-style:none; }
.fiche li { color:var(--ink-dim); font-size:0.87rem; padding-left:18px; position:relative; margin-bottom:6px; }
.fiche li::before { content:'◆'; position:absolute; left:0; color:var(--gold); font-size:0.6rem; top:0.35em; }
.fiche .liens { display:flex; flex-wrap:wrap; gap:8px; }

/* ── Chips / filtres ── */
.chips { display:flex; flex-wrap:wrap; gap:10px; margin-bottom:22px; }
.chip {
  border:1px solid var(--line); border-radius:999px; padding:6px 16px;
  font-size:0.76rem; color:var(--ink-dim); transition:all .2s;
}
.chip:hover { border-color:var(--gold); color:var(--gold-2); }
.chip-actif { background:rgba(201,164,92,0.14); color:var(--gold-2); border-color:var(--gold); }
.filtres { display:flex; gap:12px; flex-wrap:wrap; align-items:center; margin-bottom:8px; }
.filtres input[type=search] {
  flex:1; min-width:220px; background:var(--bg-2); border:1px solid var(--line);
  border-radius:999px; padding:9px 18px; color:var(--ink); font-family:'Inter',sans-serif; font-size:0.85rem; outline:none;
}
.filtres input[type=search]:focus { border-color:var(--gold); }
.filtres select {
  background:var(--bg-2); border:1px solid var(--line); border-radius:999px;
  padding:9px 16px; color:var(--ink); font-family:'Inter',sans-serif; font-size:0.82rem; outline:none;
}
.filtres .check { font-size:0.8rem; color:var(--ink-dim); display:flex; align-items:center; gap:8px; cursor:pointer; }
.filtres .check input { accent-color:var(--gold); }
.btn {
  display:inline-block; background:var(--gold); color:#14100a; border:none; border-radius:999px;
  padding:9px 22px; font-size:0.78rem; letter-spacing:0.1em; text-transform:uppercase;
  font-weight:600; cursor:pointer; font-family:'Inter',sans-serif; transition:all .2s;
}
.btn:hover { background:var(--gold-2); color:#14100a; }
.filtre-lien { display:flex; gap:14px; align-items:center; margin-bottom:10px; }

/* ── Tables de données ── */
.table-wrap { overflow-x:auto; border:1px solid var(--line); border-radius:12px; margin-bottom:28px; }
table.data { width:100%; border-collapse:collapse; font-size:0.82rem; }
table.data th {
  background:var(--panel-2); color:var(--gold-2); text-align:left;
  padding:10px 14px; font-size:0.68rem; letter-spacing:0.14em; text-transform:uppercase; font-weight:500;
}
table.data td { padding:9px 14px; border-top:1px solid rgba(201,164,92,0.10); color:var(--ink-dim); }
table.data tr:hover td { background:rgba(201,164,92,0.05); color:var(--ink); }

/* ── Chronologies ── */
.timeline { position:relative; padding-left:120px; }
.timeline::before { content:''; position:absolute; left:98px; top:6px; bottom:6px; width:1px;
  background:linear-gradient(rgba(201,164,92,0.5), rgba(201,164,92,0.15)); }
.tl-item { position:relative; padding:14px 0; }
.tl-annee {
  position:absolute; left:-120px; top:16px; width:86px; text-align:right;
  font-family:'Cormorant Garamond',serif; font-size:1.05rem; color:var(--gold);
}
.tl-item::before { content:''; position:absolute; left:-26px; top:22px; width:9px; height:9px;
  border-radius:50%; background:var(--bg); border:2px solid var(--gold); }
.tl-body { border:1px solid var(--line); border-radius:12px; background:var(--panel); padding:16px 22px; }
.tl-body h3 { font-family:'Cormorant Garamond',serif; font-size:1.15rem; font-weight:600; margin-bottom:4px; }
.tl-body h3 a { color:var(--ink); }
.tl-body h3 a:hover { color:var(--gold-2); }
.tl-body p { color:var(--ink-dim); font-size:0.84rem; }
.tl-body .meta { font-size:0.7rem; margin-top:6px; }

/* ── KaTeX ── */
.tex { color:var(--gold-2); }
div.tex { margin:12px 0; padding:14px 18px; background:var(--bg-2); border:1px solid var(--line); border-radius:10px; overflow-x:auto; }
.katex { font-size:1.02em; }

/* ── Avertissement / note ── */
.avertissement {
  border:1px dashed rgba(201,164,92,0.4); border-radius:14px; background:rgba(201,164,92,0.05);
  padding:22px 26px; font-size:0.88rem; color:var(--ink-dim);
}
.avertissement strong { color:var(--ink); font-weight:500; }

/* ── Pied de page ── */
.site-footer { border-top:1px solid var(--line); margin-top:60px; padding:48px 0 30px; background:var(--bg-2); }
.foot-grid { display:grid; grid-template-columns:2fr 1fr 1fr; gap:32px; margin-bottom:28px; }
.foot-title { font-family:'Cormorant Garamond',serif; font-size:1.1rem; color:var(--gold-2); margin-bottom:10px; }
.foot-note { font-size:0.78rem; color:var(--ink-dim); }
.foot-links { list-style:none; }
.foot-links a { font-size:0.8rem; color:var(--ink-dim); }
.foot-links a:hover { color:var(--gold-2); }
.foot-line { text-align:center; font-size:0.72rem; color:var(--ink-dim); letter-spacing:0.1em; border-top:1px solid rgba(201,164,92,0.12); padding-top:20px; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns:1fr 1fr; }
  .stats-grid { grid-template-columns:1fr 1fr; }
  .search { display:none; }
  .nav-toggle { display:block; }
  .site-nav { display:none; }
  body.nav-open .site-nav { display:block; }
  .site-nav ul { flex-direction:column; padding:8px 0 16px; }
  .foot-grid { grid-template-columns:1fr; }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .stats-grid { grid-template-columns:1fr; }
  .timeline { padding-left:86px; }
  .timeline::before { left:66px; }
  .tl-annee { left:-86px; width:56px; font-size:0.9rem; }
  .tl-item::before { left:-23px; }
  .fiche { padding:24px 20px; }
}