body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: white;
  color: #222;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px;
}

.heading {
  text-align: center;
  font-size: 2.5em;
  font-style: italic;
  font-weight: bold;
  margin-bottom: 30px;
}

.filters {
  text-align: center;
  margin-bottom: 20px;
  font-size: 1rem;
}

.filters select {
  margin-left: 10px;
  padding: 5px;
  font-size: 1rem;
}

.calendar-header {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.calendar-header button {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background-color: #ccc;
}

.day {
  background-color: #f3f3f3;
  padding: 15px;
  text-align: center;
  min-height: 120px;
}

.day-name {
  display: block;
  font-size: 0.9em;
  color: #777;
}

.date {
  display: block;
  font-size: 1.2em;
  font-weight: bold;
  margin-bottom: 10px;
}

.no-class {
  font-size: 1rem;
  color: #999;
}