<div id="form-wrapper">
  <form action="/p/quote.php" method="GET">
    <h1 id="form-title">Select Debt Amount</h1>
    <div id="debt-amount-slider">
      <input type="radio" name="debt-amount" id="1" value="1" required>
      <label for="1" data-debt-amount="< $10k"></label>
      <input type="radio" name="debt-amount" id="2" value="2" required>
      <label for="2" data-debt-amount="$10k-25k"></label>
      <input type="radio" name="debt-amount" id="3" value="3" required>
      <label for="3" data-debt-amount="$25k-50k"></label>
      <input type="radio" name="debt-amount" id="4" value="4" required>
      <label for="4" data-debt-amount="$50k-100k"></label>
      <input type="radio" name="debt-amount" id="5" value="5" required>
      <label for="5" data-debt-amount="$100k+"></label>
      <div id="debt-amount-pos"></div>
    </div>
  </form>
  <button type="submit">Get Debt Free!</button>
</div>

$number-of-options: 5;
html, body {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Nunito', sans-serif;
  color: #000;
  user-select: none;
}
#form-wrapper {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}
form {
  width: 90%;
  max-width: 500px;
  #form-title {
    margin-top: 0;
    font-weight: 400;
    text-align: center;
  }
  #debt-amount-slider {
    display: flex;
    flex-direction: row;
    align-content: stretch;
    position: relative;
    width: 100%;
    height: 50px;
    user-select: none;
    &::before {
      content: " ";
      position: absolute;
      height: 2px;
      width: 100%;
      width: calc(100% * (#{$number-of-options - 1} / #{$number-of-options}));
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      background: #000;
    }
    input, label {
      box-sizing: border-box;
      flex: 1;
      user-select: none;
      cursor: pointer;
    }
    label {
      display: inline-block;
      position: relative;
      width: 20%;
      height: 100%;
      user-select: none;
      &::before {
        content: attr(data-debt-amount);
        position: absolute;
        left: 50%;
        padding-top: 10px;
        transform: translate(-50%, 45px);
        font-size: 14px;
        letter-spacing: 0.4px;
        font-weight: 400;
        white-space: nowrap;
        opacity: 0.85;
        transition: all 0.15s ease-in-out;
      }
      &::after {
        content: " ";
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        width: 30px;
        height: 30px;
        border: 2px solid #000;
        background: #fff;
        border-radius: 50%;
        pointer-events: none;
        user-select: none;
        z-index: 1;
        cursor: pointer;
        transition: all 0.15s ease-in-out;
      }
      &:hover::after {
        transform: translate(-50%, -50%) scale(1.25);
      }
    }
    input {
      display: none;
      &:checked {
        + label::before {
          font-weight: 800;
          opacity: 1;
        }
        + label::after {
          border-width: 4px;
          transform: translate(-50%, -50%) scale(0.75);
        }
        ~ #debt-amount-pos {
          opacity: 1;
        }
        @for $i from 1 through $number-of-options {
          &:nth-child(#{$i * 2 - 1}) ~ #debt-amount-pos {
            left: #{($i * 20%) - 10%};
          }
        }
      }
    }
    #debt-amount-pos {
      display: block;
      position: absolute;
      top: 50%;
      width: 12px;
      height: 12px;
      background: #000;
      border-radius: 50%;
      transition: all 0.15s ease-in-out;
      transform: translate(-50%, -50%);
      border: 2px solid #fff;
      opacity: 0;
      z-index: 2;
    }
  }
  &:valid {
    #debt-amount-slider {
      input {
        + label::before {
          transform: translate(-50%, 45px) scale(0.9);
          transition: all 0.15s linear;
        }
        &:checked + label::before {
          transform: translate(-50%, 45px) scale(1.1);
          transition: all 0.15s linear;
        }
      }
    }
  }
  & + button {
    display: block;
    position: relative;
    margin: 56px auto 0;
    padding: 10px 20px;
    appearance: none;
    transition: all 0.15s ease-in-out;
    font-family: inherit;
    font-size: 24px;
    font-weight: 600;
    background: #fff;
    border: 2px solid #000;
    border-radius: 8px;
    outline: 0;
    user-select: none;
    cursor: pointer;
    &:hover {
      // transform: scale(1.1);
      background: #000;
      color: #fff;
      &:active {
        transform: scale(0.9);
      }
    }
    &:focus {
      background: #4caf50;
      border-color: #4caf50;
      color: #fff;
      pointer-events: none;
      &::before {
        animation: spin 1s linear infinite;
      }
    }
    &::before {
      display: inline-block;
      width: 0;
      opacity: 0;
      content: "\f3f4";
      font-family: "Font Awesome 5 Pro";
      font-weight: 900;
      margin-right: 0;
      transform: rotate(0deg);
    }
  }
  &:invalid + button {
    pointer-events: none;
    opacity: 0.25;
  }
}
@keyframes spin {
  from {
    transform: rotate(0deg);
    width: 24px;
    opacity: 1;
    margin-right: 12px;
  }
  to {
    transform: rotate(360deg);
    width: 24px;
    opacity: 1;
    margin-right: 12px;
  }
}