.o-collapse {

  &.-spaced {
    .o-collapse-item {
      border-radius: $border-radius-base;

      &:not(:first-child) {
        margin-top: $space-4;
      }
    }
  }
}

.o-collapse-item {
  background-color: #fff;
  border: $border-grey-light;

  &:not(.-open) {
    .o-collapse-body {
      display: none;
    }
  }

  &.-open {
    .o-collapse-header {
      border-radius: $border-radius-base $border-radius-base 0 0;

      &:after {
        transform: rotate(180deg);
      }
    }

    .o-collapse-summary {
      opacity: 0;
      visibility: hidden;
    }
  }

  &:first-child {
    border-radius: $border-radius-base $border-radius-base 0 0;
  }

  &:last-child {
    border-radius: 0 0 $border-radius-base $border-radius-base;
  }

  &:only-of-type {
    border-radius: $border-radius-base;
  }

  &:not(:first-child) {
    margin-top: -1px;
  }
}

.o-collapse-header {
  display: flex;
  align-items: center;
  font-size: $font-lg;
  padding: $space-4 $space-5;
  transition: background-color ease 0.3s;
  border-radius: $border-radius-base;
  line-height: 1.2;

  &:hover {
    background-color: $color-grey-0;
    cursor: pointer;
  }

  &::after {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    top: 1px; // optical alignment
    width: 20px;
    height: 20px;
    content: "\f078";
    font-family: "Font Awesome 5 Free", sans-serif;
    font-size: 14px;
    font-weight: 900;
    color: $color-grey-700;
    margin-left: auto;
    margin-right: $space-1;
    transition: transform ease 0.25s;
  }
}

.o-collapse-header-icon {
  font-size: $font-lg;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  padding-right: $space-5;
}

.o-collapse-header-content {
  flex: 1;
  font-size: $font-base;
  padding-right: $space-6;

  p {
    margin: 0;
    font-size: $font-m;
    color: $color-grey-500;
    line-height: 1.5;
  }
}

.o-collapse-summary {
  margin-left: $space-4;
  margin-right: $space-6;
  color: $color-grey-400;
  font-size: $font-m;
  user-select: none;
  transition: opacity linear 0.15s;
}

.o-collapse-body {
  padding: $space-6 $space-11;
  border-top: $border-grey-light;
}