.calendar {
  width: 280px;
  border: 1px solid #ccc;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  font-family: sans-serif;
  text-align: center;
  padding: 10px;
  margin: 0 auto;
}

.calendar .nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.calendar .nav button {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: #333;
}

.calendar .nav span {
  font-weight: bold;
  text-transform: capitalize;
  color: #2563eb;
}

.calendar .days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.calendar .day {
  padding: 6px;
  border-radius: 8px;
  cursor: pointer;
  color: #333;
  user-select: none;
}

.calendar .day:hover {
  background-color: #e0e7ff;
}

.calendar .today {
  background-color: #2563eb;
  color: white;
}

.calendar .selected {
  background-color: #4ade80 !important;
  color: white;
}

mark {
  background-color: #fff176;
  padding: 0 2px;
  border-radius: 3px;
}