body {
  font-family: Arial, sans-serif;
  text-align: center;
  background-color: #f8f0e3;
  color: #333;
  margin: 0;
  padding: 0;
}

#calendar-container {
  margin: 20px auto;
  padding: 20px;
  max-width: 600px;
  background-color: #fff8dc;
  border: 2px solid #d4af37;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

h1 {
  color: #d62828;
}

#calendar-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin: 20px 0;
}

#calendar-grid div {
  width: 50px;
  height: 50px;
  background-color: #d62828;
  color: white;
  font-size: 18px;
  font-weight: bold;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 5px;
  cursor: pointer;
  transition: transform 0.3s, background-color 0.3s;
}

#calendar-grid div.opened {
  background-color: #8ac926;
  cursor: not-allowed;
  transform: scale(1.1);
}

#reset-button {
  background-color: #d4af37;
  color: white;
  border: none;
  padding: 10px 20px;
  font-size: 16px;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s;
}

#reset-button:hover {
  background-color: #c69720;
}

#custom-message {
  margin-top: 20px;
}

#popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: white;
  border: 2px solid #d4af37;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  z-index: 1000;
}

#popup.hidden {
  display: none;
}

#popup-close {
  position: absolute;
  top: 10px;
  right: 10px;
  cursor: pointer;
  color: #d62828;
  font-size: 20px;
  font-weight: bold;
}