Voici le **`style.css`** complet, prêt à coller :

```css
/* ====== Reset & base ====== */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 14px/1.45 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: #0f172a; /* slate-900 */
  background: #f8fafc; /* slate-50 */
}

/* ====== Carte plein écran ====== */
#map {
  position: fixed;
  inset: 0;
}

/* ====== Panneau UI (slider) ====== */
#ui {
  position: fixed;
  left: 50%;
  bottom: 16px;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 10px 14px;
  background: rgba(255,255,255,.95);
  backdrop-filter: saturate(140%) blur(6px);
  border: 1px solid rgba(15,23,42,.08);
  border-radius: 14px;
  box-shadow:
    0 10px 20px rgba(2,6,23,.08),
    0 2px 6px rgba(2,6,23,.06);
  z-index: 30;
}

#ui label {
  font-weight: 600;
  color: #0f172a;
}

#decade {
  width: 220px;
  accent-color: #2563eb; /* blue-600 */
}

#ticks {
  display: flex;
  gap: 6px;
}
#ticks button {
  border: 0;
  background: transparent;
  color: #334155; /* slate-600 */
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 8px;
  cursor: pointer;
}
#ticks button:hover,
#ticks button:focus {
  outline: none;
  background: rgba(37, 99, 235, .1);
  color: #1e40af; /* blue-800 */
}

/* ====== Hover card ====== */
#hover {
  position: fixed;
  min-width: 280px;
  max-width: min(80vw, 360px);
  background: #ffffff;
  border: 1px solid rgba(15,23,42,.08);
  border-radius: 14px;
  padding: 12px 14px;
  box-shadow:
    0 18px 40px rgba(2,6,23,.16),
    0 2px 8px rgba(2,6,23,.08);
  z-index: 40;
  pointer-events: none; /* suit le curseur/tap */
}

#hover .head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 2px 0 8px;
}
#hover img {
  width: 26px;
  height: 18px;
  object-fit: cover;
  border: 1px solid #e2e8f0; /* slate-200 */
  border-radius: 3px;
  background: #f8fafc;
}
#hover h3 {
  margin: 0;
  font-size: 16px;
  line-height: 1.2;
  font-weight: 700;
  color: #0f172a;
}

#hover .meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  color: #0f172a;
}
#hover .meta b {
  font-weight: 600;
  color: #334155; /* slate-600 */
}

#hover .news {
  margin-top: 8px;
}
#hover .news b {
  display: inline-block;
  margin-bottom: 4px;
  color: #0f172a;
}
#hover ul {
  margin: 0 0 0 18px;
  padding: 0;
}
#hover li {
  margin: 0 0 4px;
}
#hover a {
  color: #1d4ed8; /* blue-700 */
  text-decoration: none;
}
#hover a:hover, #hover a:focus {
  text-decoration: underline;
}

/* ====== Statut (chargements, messages) ====== */
#status {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 50;
  background: rgba(15,23,42,.9);
  color: #fff;
  padding: 6px 10px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .2px;
  box-shadow: 0 8px 20px rgba(0,0,0,.25);
  user-select: none;
}

/* ====== Lien crédits ====== */
#credits-link {
  position: fixed;
  right: 10px;
  bottom: 10px;
  z-index: 30;
  background: rgba(255,255,255,.95);
  border: 1px solid rgba(15,23,42,.08);
  padding: 6px 10px;
  border-radius: 10px;
  color: #334155;
  text-decoration: none;
  font-weight: 600;
}
#credits-link:hover { color: #1e40af; }

/* ====== Responsive ====== */
@media (max-width: 640px) {
  #ui {
    gap: 10px;
    padding: 8px 10px;
  }
  #decade { width: 170px; }
  #hover { max-width: 88vw; }
}

/* ====== Accessibilité / préférences ====== */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}
@media (prefers-contrast: more) {
  #ui, #hover, #credits-link {
    border-color: rgba(15,23,42,.25);
  }
}

/* ====== MapLibre fixes ====== */
.maplibregl-ctrl-bottom-left,
.maplibregl-ctrl-bottom-right {
  margin-bottom: 64px; /* éviter de recouvrir le slider */
}