* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body,
html {
  height: 100%;
  font-family: sans-serif;
}

.slideshow {
  position: relative;
  width: 100%;
  height: 90vh;
  overflow: hidden;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0;
  transition: opacity 1.5s ease-in-out;
}

.slide.visible {
  opacity: 1;
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.3); /* léger assombrissement */
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
  text-align: center;
  padding: 1rem;
}

.overlay h1 {
  font-size: 3rem;
  text-shadow: 0 2px 5px rgba(0, 0, 0, 0.7);
}

@media (max-width: 768px) {
  .overlay h1 {
    font-size: 2rem;
  }
}