.tabs {
  margin-top: 40px;
  display: flex;
  gap: 36px;
  border-bottom: 1px solid var(--line);
}
.tabs button {
  position: relative;
  padding: 0 0 14px;
  background: none;
  border: 0;
  cursor: pointer;
  font: 500 17px var(--sans);
  color: var(--muted);
}
.tabs button:hover {
  color: var(--ink);
}
.tabs button[aria-selected="true"] {
  color: var(--ink);
}
.tabs button::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--navy);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
}
.tabs button[aria-selected="true"]::after {
  transform: scaleX(1);
}
.viewport {
  overflow: hidden;
  margin-top: 36px;
}
.viewport.sliding {
  transition: height 0.5s cubic-bezier(0.65, 0, 0.35, 1);
}
.track {
  display: flex;
  align-items: flex-start;
  transition: transform 0.6s cubic-bezier(0.65, 0, 0.35, 1);
}
.slide {
  flex: 0 0 100%;
  min-width: 0;
}
.intro2 {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}
.intro2 .big {
  font-size: 22px;
  line-height: 1.4;
  letter-spacing: -0.012em;
}
.intro2 .side {
  color: var(--body);
  padding-left: 18px;
  border-left: 3px solid var(--navy);
}

.stage {
  margin-top: 32px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 36px 28px;
  background: var(--bg);
  overflow: hidden;
}

@media (max-width: 900px) {
  .intro2 {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}
@media (max-width: 560px) {
  .stage {
    padding: 24px 14px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .track,
  .tabs button::after,
  .viewport {
    transition: none;
  }
}