.flex_row, .C_header {
  display: flex;
  flex-flow: row nowrap;
}

.flex_col, .C_content, .C_main {
  display: flex;
  flex-flow: column nowrap;
}

.fill {
  width: 100%;
  height: 100%;
}

.C_main {
  width: 100%;
}

.C_header {
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  cursor: pointer;
  background-color: var(--color_2);
  transition: filter 0.2s;
  overflow: hidden;
  border-radius: 1rem;
}
.C_header:active {
  filter: brightness(1.1);
}

.C_title {
  font-weight: bold;
  color: var(--color_4);
  font-size: 1.1rem;
}

.C_icon {
  width: 2rem;
  height: 2rem;
  fill: var(--color_4);
}

.C_content {
  overflow: hidden;
  overflow-y: auto;
  border: 0.1rem solid var(--color_2);
  border-radius: 0 0 1rem 1rem;
  padding: 1rem;
  background-color: var(--color_4);
  flex: 1;
}

.slide-enter-active, .slide-leave-active {
  transition: max-height 0.3s;
  max-height: 50rem;
}

.slide-enter, .slide-leave-to {
  max-height: 0;
}