/* ─── Variables ──────────────────────────────────────────── */
:root {
  --gf-violet:   #5e35b1;
  --gf-cyan:     #00bcd4;
  --gf-dark:     #1a1a2e;
  --gf-light:    #f5f5f5;
  --gf-gradient: linear-gradient(135deg, var(--gf-violet), var(--gf-cyan));
}

/* ─── Navbar ─────────────────────────────────────────────── */
.navbar {
  background: var(--gf-dark) !important;
  border-bottom: 2px solid var(--gf-violet);
}
.navbar-brand { font-weight: 700; letter-spacing: 0.05em; }

/* ─── Hero banner ────────────────────────────────────────── */
.hero {
  background: var(--gf-gradient);
  color: white;
  padding: 6rem 2rem;
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("images/hero-bg.svg") center/cover no-repeat;
  opacity: 0.08;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  text-shadow: 0 2px 8px rgba(0,0,0,.4);
  position: relative;
}
.hero .subtitle {
  font-size: 1.2rem;
  opacity: .9;
  max-width: 700px;
  margin: 1rem auto 0;
  position: relative;
}
.hero .btn-hero {
  margin-top: 2rem;
  position: relative;
}

/* ─── Cards ──────────────────────────────────────────────── */
.card {
  border: none;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,.08);
  transition: transform .25s, box-shadow .25s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,.15);
}
.card-header {
  background: var(--gf-gradient);
  color: white;
  border-radius: 12px 12px 0 0 !important;
  font-weight: 600;
}

/* ─── Section labels ─────────────────────────────────────── */
.section-label {
  display: inline-block;
  background: var(--gf-gradient);
  color: white;
  padding: .25rem .9rem;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: .5rem;
}

/* ─── Timeline ───────────────────────────────────────────── */
.timeline {
  position: relative;
  padding-left: 2rem;
}
.timeline::before {
  content: "";
  position: absolute;
  left: .5rem;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--gf-gradient);
}
.timeline-item {
  position: relative;
  margin-bottom: 2rem;
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.6rem;
  top: .35rem;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--gf-violet);
  border: 2px solid white;
  box-shadow: 0 0 0 2px var(--gf-violet);
}
.timeline-year {
  font-weight: 700;
  color: var(--gf-violet);
  font-size: .9rem;
}

/* ─── Team cards ─────────────────────────────────────────── */
.team-card img {
  width: 100px; height: 100px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--gf-violet);
}
.team-card .role {
  font-size: .8rem;
  color: var(--gf-cyan);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
}

/* ─── Publication list ───────────────────────────────────── */
.pub-entry {
  border-left: 3px solid var(--gf-violet);
  padding-left: 1rem;
  margin-bottom: 1.5rem;
}
.pub-entry .pub-type {
  font-size: .75rem;
  background: #ede7f6;
  color: var(--gf-violet);
  padding: .1rem .5rem;
  border-radius: 10px;
  font-weight: 600;
}

/* ─── Logos partenaires ──────────────────────────────────── */
.partners img {
  max-height: 60px;
  filter: grayscale(1);
  opacity: .6;
  transition: filter .2s, opacity .2s;
}
.partners img:hover { filter: none; opacity: 1; }

/* ─── Footer ─────────────────────────────────────────────── */
.nav-footer {
  background: var(--gf-dark);
  color: #aaa;
  border-top: 2px solid var(--gf-violet);
}
.nav-footer a { color: var(--gf-cyan); }

/* ─── Responsive tweaks ──────────────────────────────────── */
@media (max-width: 768px) {
  .hero { padding: 4rem 1rem; }
}