:root {
    --primary-color: #f90a39;
    --text-color: #1d1d1d;
    --bg-color: #f1f1fb;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    background: #ffffff;
    font-family: "Poppins", sans-serif;
  }
  
  .container {
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .calendar {
    width: 100%;
    max-width: 600px;
    background: var(--bg-color);
    padding: 30px 20px;
    border-radius: 10px;
  }
  
  .calendar .header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 2px solid #ccc;
  }
  
  .calendar .header .month {
    display: flex;
    align-items: center;
    font-size: 25px;
    font-weight: 600;
    color: var(--text-color);
  }
  
  .calendar .header .btns {
    display: flex;
    gap: 10px;
  }
  
  .calendar .header .btns .btn {
    width: 50px;
    height: 40px;
    background: var(--primary-color);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 5px;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
  }
  
  .calendar .header .btns .btn:hover {
    background: #db0933;
    transform: scale(1.05);
  }
  
  .calendar .weekdays {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
  }
  
  .calendar .weekdays .day {
    width: calc(100% / 7 - 10px);
    text-align: center;
    font-size: 16px;
    font-weight: 600;
  }
  
  .calendar .days {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
  }
  
  .calendar .days .day {
    width: calc(100% / 7 - 10px);
    height: 50px;
    background: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 400;
    color: var(--text-color);
    transition: all 0.3s;
    user-select: none;
  }
  
  .calendar .days .day:not(.next):not(.prev):hover {
    color: #fff;
    background: var(--primary-color);
    transform: scale(1.05);
  }
  
  .calendar .days .day.next,
  .calendar .days .day.prev {
    color: #ccc;
  }
  
  .calendar .days .day.today {
    color: #fff;
    background: var(--primary-color);
  }
  
  .credits a {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 14px;
    color: #aaa;
  }
  
  .credits span {
    color: var(--primary-color);
  }