html, body {
  margin: 0;
  height: 100%;
}

/* couche image de fond (changée en JS au scroll) */
.bg {
  position: fixed;
  inset: 0;

  background-size: cover;
  background-position: center;

  opacity: 1;
  z-index: -2;

  transition: opacity 0.8s ease;
}

/* couche sombre cinéma */
.bg-overlay {
  position: fixed;
  inset: 0;

  background: linear-gradient(
    rgba(0,0,0,0.2),
    rgba(0,0,0,0.35)
  );

  z-index: -1;
  pointer-events: none;

  transition: opacity 0.8s ease;
}

/* overlay cinéma supplémentaire */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: -1;
  pointer-events: none;
}

/* effet cinéma sur les panneaux (surcharge de .panel de global-style.css) */
.panel {
  height: 100vh;

  opacity: 0.2;
  transform: scale(0.92);
  filter: blur(8px);
  transition: 0.8s ease;
}

.panel.active {
  opacity: 1;
  transform: scale(1);
  filter: blur(0);
}

/* TITRE CENTRÉ STYLE ACCUEIL */
.hero-center {
  text-align: center;
  color: white;
  max-width: 800px;
  margin: auto;
}

.hero-center h1 {
  font-size: clamp(3rem, 6vw, 6rem);
  margin-bottom: 20px;
}

.hero-center p {
  font-size: 1.2rem;
  opacity: 0.85;
}

.hero-center button {
  margin-top: 20px;
}