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

body {
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  background-color: transparent;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background: linear-gradient(
      rgba(0, 0, 0, 0.5),  /* couche sombre */
      rgba(0, 0, 0, 0.5)
    ),
    url('images/PHOTO-2025-05-11-21-09-22.jpg');
  background-size: cover;
  background-position: center;
  filter: blur(0.3px);
  z-index: -1;
}

header {
  position: absolute;
  top: 0;
  width: 100%;
  color: white;
  padding: 1em 0;
  text-align: center;
  z-index: 2;
  background-color: transparent;
}

nav ul {
  list-style-type: none;
  padding: 0;
  display: flex;
  justify-content: center;
  background-color: transparent;
  margin: 0;
}

nav ul li {
  margin: 0 15px;
}

nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: bold;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.6);
}

main {
  flex: 1;
  padding: 6em 2em 2em 2em;
  text-align: center;
  margin: 0 auto;
  width: 100%;
  max-width: 900px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
  z-index: 1;
}

.gallery img {
  width: 30%;
  margin: 1%;
  border-radius: 8px;
}

.booking .btn_bleu {
  display: inline-block;
  margin-top: 20px;
  padding: 10px 20px;
  background-color: #252f9d;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}

.airbnb .btn_rouge {
  display: inline-block;
  margin-top: 20px;
  padding: 10px 20px;
  background-color: #ae2727;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}
footer {
  background-color: #2c3e50;
  color: white;
  text-align: center;
  padding: 1em 0;
  margin-top: auto;
  z-index: 1;
}