.os-d { background: var(--cream); padding: 96px 0 120px; }
.os-d__head { margin-bottom: 56px; max-width: 640px; }
.os-d__head h2 { font-family: var(--font-serif); font-weight: 400; font-size: clamp(32px, 4.4vw, 56px); margin: 0; }
.os-d__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}
@media (min-width: 900px) { .os-d__layout { grid-template-columns: 320px 1fr; gap: 64px; } }
.os-d__photo { margin: 0; border-radius: var(--radius-md); overflow: hidden; background: var(--teal); padding: 6px; }
.os-d__photo img { width: 100%; aspect-ratio: 4/5; object-fit: cover; border-radius: calc(var(--radius-md) - 6px); }
.os-d__photo figcaption { text-align: center; color: var(--white); padding: 8px 0 4px; font-size: 13px; font-weight: 600; letter-spacing: 0.05em; }

.os-d__timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
  padding-left: 24px;
}
.os-d__timeline::before {
  content: "";
  position: absolute;
  left: 6px; top: 10px; bottom: 10px;
  width: 2px;
  background: var(--line);
}
.os-d__timeline li {
  position: relative;
  padding: 12px 0 24px;
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 24px;
  align-items: baseline;
}
.os-d__timeline li::before {
  content: "";
  position: absolute;
  left: -24px; top: 20px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--teal);
}
.os-d__timeline li.is-current::before { background: var(--teal); }
.os-d__year {
  font-family: var(--font-serif);
  color: var(--teal);
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.01em;
}
.os-d__text {
  font-family: var(--font-serif);
  color: var(--navy);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.3;
}
.os-d__timeline li.is-current .os-d__text { font-weight: 500; }