.calendar {
      background-color: white;
      border-radius: 5px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      width: 350px;
      height: 410px;
      padding: 1.5rem;
    }

    .calendar-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1rem;
    }

    .calendar-header button {
      background: none;
      border: none;
      font-size: 1.4rem;
      cursor: pointer;
      color: #333;
    }

    .calendar-header h2 {
      font-size: 1.2rem;
      font-weight: 600;
      margin: 0;
    }

    .day-names, .calendar-days {
      display: grid;
      grid-template-columns: repeat(7, 1fr);
      text-align: center;
      gap: 5px;
    }

    .day-names div {
      font-weight: bold;
      color: #555;
    }

    .calendar-days a {
      text-decoration: none;
      color: inherit;
      display: block;
      padding: 10px 0;
      border-radius: 8px;
      transition: background 0.2s;
    }

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

    .calendar-days .today a {
      background-color: #6366f1;
      color: white;
      font-weight: bold;
    }

    .calendar-days .selected a {
      background-color: #3b82f6;
      color: white;
    }

    .calendar-days .inactive a {
      color: #ccc;
      pointer-events: none;
    }