:root {
  --color-01: #F0F0F0;
  --color-02: #155FE8;
  --color-03: #D9D9D9;
  --color-04: #0C318B;
  --color-05: #6E9FF9;
  --color-06: #E3EDFF;
  --color-07: #6B6B6B;
  --grayline: #D6D6D6;
}

body {
  overflow: clip;
}

.case__sticky {
  position: sticky;
  left: 0;
  top: 40px;
  background-color: #FFF;
  padding-block: 16px;
  z-index: 1;
}
.case__heading {
  padding-top: 24px;
  border-top: 1px solid var(--color-02);
  margin-bottom: 20px;
}
.case__heading-ttl {
  color: var(--color-04);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 2;
}
.case__heading-sub {
  color: var(--color-04);
  font-size: 1.3rem;
}
.case__heading-note {
  width: -moz-fit-content;
  width: fit-content;
  margin-left: auto;
  color: var(--color-07);
  font-size: 1.2rem;
  line-height: 2;
}
@media screen and (min-width: 768px) {
  .case__heading-ttl {
    font-size: 2rem;
  }
}
@media screen and (min-width: 901px) {
  .case__sticky {
    top: 64px;
  }
}