* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  background-color: #f5f5f5;
  font-family: Arial, sans-serif;
  margin: 0;
  color: #333;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 50px;
  background-color: white;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo img {
  height: 70px;
  padding-top: 20px;
}

.search-container {
  display: flex;
  align-items: center;
}

.search-box {
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  margin-right: 10px;
  font-size: 14px;
}

.search-icon {
  font-size: 20px;
  color: #333;
  cursor: pointer;
}

.main-nav {
  display: flex;
  justify-content: right;
  background-color: white;
  padding: 5px 0;
}

.main-nav ul {
  display: flex;
  list-style: none;
}

.main-nav ul li {
  margin: 0 15px;
}

.main-nav ul li a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
  padding: 5px 0;
  transition: color 0.3s;
  display: flex;
  align-items: center;
}

.home-icon {
  margin-right: 0.1px;
  font-size: 14px;
  position: relative;
  top: -1px;
  display: inline-flex;
  align-items: center;
}

.main-nav ul li a:hover {
  color: #0066cc;
}

.main-nav ul li:first-child a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding-top: 3px;
}

/* Modifications pour la section combinée */
.combined-section {
  position: relative;
  color: white;
  display: flex;
  flex-direction: column;
}

/* Nouvelle approche pour l'image de fond */
.hero-content {
  position: relative;
  min-height: 400px; /* Hauteur minimale pour tous les écrans */
  display: flex;
  flex-direction: column;
  justify-content: top;
  background-image: url('../images/BatimentIRR.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  padding: 50px;
  margin-bottom: 50px; /* Augmenté pour laisser plus d'espace pour le chevauchement des cartes */
  z-index: 1;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: bold;
  margin-bottom: 20px;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
}

.hero-subtitle {
  font-size: 2.5rem;
  margin-bottom: 30px;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
}

.cta-button {
  display: inline-block;
  background-color: #0d47a1;
  color: white;
  padding: 12px 25px;
  text-decoration: none;
  font-weight: bold;
  border-radius: 3px;
  transition: background-color 0.3s;
  width: fit-content;
}

.cta-button:hover {
  background-color: #0a3880;
}

.feature-section {
  display: flex;
  justify-content: space-around;
  padding: 0 10% 30px 10%;
  margin-top: -80px; /* Augmenté pour que les cartes chevauchent plus l'image de fond */
  flex-wrap: wrap; /* Permet aux cartes de passer à la ligne sur petit écran */
  position: relative;
  z-index: 10; /* Assure que les cartes sont au-dessus de l'image */
}

.feature-card1, .feature-card2, .feature-card3, .feature-card4 {
  flex: 1;
  margin: 15px;
  padding: 20px;
  background-color: rgba(255, 255, 255, 0.85);
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
  color: #333;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  min-width: 200px; /* Largeur minimale pour éviter l'écrasement sur petit écran */
}

.feature-card1 {
  border-top: 3px solid #0d47a1;
}

.feature-card2 {
  border-top: 3px solid #c529b0;
}

.feature-card3 {
  border-top: 3px solid #e77a20;
}

.feature-card4 {
  border-top: 3px solid #74af4c;
}

.feature-card1:hover, .feature-card2:hover, .feature-card3:hover, .feature-card4:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 15px;
  color: #0d47a1;
  font-weight: 600;
}

.footer {
  text-align: center;
  font-size: 0.9em;
  line-height: 1.5em; /* Augmenté pour une meilleure lisibilité */
  color: #817979;
  width: 100%;
}

/* Structure principale pour garantir que le footer reste en bas */
body {
  background-color: #f5f5f5;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  color: #333;
  min-height: 100vh; /* Hauteur minimale de 100% de la hauteur de la fenêtre */
  display: flex;
  flex-direction: column;
}

.combined-section {
  position: relative;
  color: white;
  padding-bottom: 10px;
  display: flex;
  flex-direction: column;
  flex: 1; /* Cette propriété permet à la section de prendre tout l'espace disponible */
}

/* Media queries pour la réactivité */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.8rem;
  }
  
  .feature-section {
    flex-direction: row;
    flex-wrap: wrap;
    margin-top: -40px; /* Ajusté pour les tablettes */
  }
  
  .feature-card1, .feature-card2, .feature-card3, .feature-card4 {
    flex-basis: calc(50% - 30px);
    margin-bottom: 20px;
  }
}

@media (max-width: 768px) {
  .header {
    padding: 15px 20px;
    flex-direction: column;
  }
  
  .main-nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero-content {
    padding: 30px 20px;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1.5rem;
  }
  
  .feature-section {
    margin-top: -30px; /* Ajusté pour mobile */
  }
  
  .feature-card1, .feature-card2, .feature-card3, .feature-card4 {
    flex-basis: 100%;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .cta-button {
    padding: 10px 20px;
  }
}