:root {
    --card-line-height: 1.2em;
    --card-padding: 1em;
    --card-radius: 0.5em;
    --color-green: #20e93b;
    --color-gray: #e2ebf6;
    --color-dark-gray: #c4d1e1;
    --radio-border-width: 2px;
    --radio-size: 1.5em;
  }
  
  
  
  .grid {
    display: grid;
    grid-gap: var(--card-padding);
    margin: 0 auto;
    max-width: 60em;
    padding: 0;
   
    @media (min-width: 42em) {
      grid-template-columns: repeat(3, 1fr);
    }
  }
  
  .card {
    background-color: #fff;
    border-radius: var(--card-radius);
    position: relative;
    
    &:hover {
      box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.15);
    }
  }
  
  .radio {
    font-size: inherit;
    margin: 0;
    position: absolute;
    right: calc(var(--card-padding) + var(--radio-border-width));
    top: calc(var(--card-padding) + var(--radio-border-width));
  }
  
  @supports(-webkit-appearance: none) or (-moz-appearance: none) { 
    .radio {
      -webkit-appearance: none;
      -moz-appearance: none;
      background: #fff;
      border: var(--radio-border-width) solid var(--color-gray);
      border-radius: 50%;
      cursor: pointer;
      height: var(--radio-size);
      outline: none;
      transition: 
        background 0.2s ease-out,
        border-color 0.2s ease-out;
      width: var(--radio-size); 
  
      &::after {
        border: var(--radio-border-width) solid #fff;
        border-top: 0;
        border-left: 0;
        content: '';
        display: block;
        height: 0.75rem;
        left: 25%;
        position: absolute;
        top: 50%;
        transform: 
          rotate(45deg)
          translate(-50%, -50%);
        width: 0.375rem;
      }
  
      &:checked {
        background: var(--color-green);
        border-color: var(--color-green);
      }
    }
    
    .card:hover .radio {
      border-color: var(--color-dark-gray);
      
      &:checked {
        border-color: var(--color-green);
      }
    }
  }
  
  .plan-details {
    border: var(--radio-border-width) solid var(--color-gray);
    border-radius: var(--card-radius);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    padding: var(--card-padding);
    transition: border-color 0.2s ease-out;
  }
  
  .card:hover .plan-details {
    border-color: var(--color-dark-gray);
  }
  
  .radio:checked ~ .plan-details {
    border-color: var(--color-green);
  }
  
  .radio:focus ~ .plan-details {
    box-shadow: 0 0 0 2px var(--color-dark-gray);
  }
  
  .radio:disabled ~ .plan-details {
    color: var(--color-dark-gray);
    cursor: default;
  }
  
  .radio:disabled ~ .plan-details .plan-type {
    color: var(--color-dark-gray);
  }
  
  .card:hover .radio:disabled ~ .plan-details {
    border-color: var(--color-gray);
    box-shadow: none;
  }
  
  .card:hover .radio:disabled {
      border-color: var(--color-gray);
    }
  
  .plan-type {
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 1em;
  }
  
  .plan-cost {
    text-align: right;
    top:5px;
    text-decoration: line-through;
    line-height: 0.1em;
    font-size: 1.0rem;
    padding: 0.5rem 0;
  }
  .plan-cost2 {
    text-align: right;
    line-height: 0.5em;
    font-size: 1.5rem;
    font-weight: bold;
    padding: 0.5rem 0;
  }
  
  .slash {
    font-weight: normal;
  }
  
  .plan-cycle {
    font-size: 2rem;
    font-variant: none;
    border-bottom: none;
    cursor: inherit;
    text-decoration: none;
  }
  
  .hidden-visually {
    border: 0;
    clip: rect(0, 0, 0, 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    white-space: nowrap;
    width: 1px;
  }