body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #f5f5f5;
  color: #333;
}

h1 {
  margin-top: 20px;
  color: #d23d3d;
}

.calendar {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  padding: 20px;
}

.door {
  background: #d23d3d;
  color: white;
  font-size: 20px;
  font-weight: bold;
  padding: 20px;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.3s ease;
}

.door.locked {
  background: #aaa;
  cursor: not-allowed;
}

.door:hover:not(.locked) {
  background: #ff6868;
}

#content {
  margin-top: 20px;
  padding: 20px;
  background: white;
  border-radius: 5px;
  display: none;
}