/* ===== Base ===== */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #4b6ef5, #3ad6a7);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ===== Header / Menu ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: top 0.3s ease;
}

.menu {
  background-color: #333;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  min-height: 80px;
}

.logo-group {
  display: flex;
  align-items: center;
  gap: 20px;
}

.logo-group img {
  height: 45px;
  width: auto;
  cursor: pointer;
}

/* Menu UL */
.menu ul {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu a {
  color: white;
  font-weight: bold;
  padding: 15px 20px;
  text-decoration: none;
  display: block;
}

.menu li:hover a {
  background-color: #444;
  border-radius: 5px;
}

/* ===== Zone page ===== */
.page {
  margin-top: 120px;
  width: min(1200px, 92%);
  margin-left: auto;
  margin-right: auto;
  padding-bottom: 60px;
}

/* ===== Carte générique ===== */
.card {
  background: white;
  padding: 40px;
  border-radius: 20px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
  color: #333;
}

/* ===== Bouton flèche haut ===== */
#scrollTopBtn {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  width: 55px;
  height: 55px;
  border-radius: 50%;
  background: #ffffffdd;
  border: none;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  cursor: pointer;
  display: none;
  justify-content: center;
  align-items: center;
  font-size: 28px;
  z-index: 9999;
}

#scrollTopBtn:hover {
  background: #f2f2f2;
}

/* ===== Responsive tablette ===== */
@media (max-width: 900px) {
  .menu {
    flex-direction: column;
    justify-content: center;
    padding: 12px 16px;
    gap: 10px;
  }

  .menu ul {
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
  }

  .menu a {
    padding: 10px 14px;
  }

  .page {
    margin-top: 180px;
    width: 94%;
  }

  .card {
    padding: 28px;
  }
}



/* ===== Responsive téléphone ===== */
@media (max-width: 600px) {
  .logo-group {
    gap: 12px;
  }

  .logo-group img {
    height: 34px;
  }

  .menu ul {
    flex-direction: column;
    width: 100%;
    gap: 4px;
  }

  .menu li {
    width: 100%;
    text-align: center;
  }

  .menu a {
    width: 100%;
    padding: 12px;
  }

  .page {
    margin-top: 230px;
    width: 95%;
  }

  .card {
    padding: 20px;
    border-radius: 16px;
  }

  #scrollTopBtn {
    width: 48px;
    height: 48px;
    font-size: 24px;
    bottom: 20px;
  }
}