.catena-thesis {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 2.4rem 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.catena-thesis-item {
  min-width: 0;
  padding: 1.25rem;
  background: var(--paper);
}

.catena-thesis-item span {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--faint);
  font: 650 0.68rem/1.3 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.catena-thesis-item strong {
  display: block;
  font-family: var(--display);
  font-size: clamp(1rem, 2vw, 1.2rem);
  letter-spacing: -0.035em;
  line-height: 1.3;
}

.catena-boundary {
  display: grid;
  width: min(1080px, calc(100vw - 64px));
  grid-template-columns: minmax(0, 1fr) 150px minmax(0, 1fr);
  align-items: stretch;
  gap: 1rem;
  margin: 2.8rem 0 2.8rem 50%;
  transform: translateX(-50%);
}

.catena-zone {
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.catena-zone-cloud {
  background: var(--paper-strong);
}

.catena-zone-label {
  margin: 0 0 1rem;
  color: var(--faint);
  font: 650 0.68rem/1.3 var(--mono);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.catena-node {
  padding: 0.9rem 1rem;
  border-top: 1px solid var(--line);
}

.catena-node:first-of-type {
  border-top: 0;
}

.catena-node strong,
.catena-node span {
  display: block;
}

.catena-node strong {
  margin-bottom: 0.18rem;
  font-size: 0.9rem;
}

.catena-node span {
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.55;
}

.catena-transfer {
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  color: var(--muted);
  text-align: center;
}

.catena-transfer::before {
  width: 100%;
  height: 1px;
  background: var(--line-strong);
  content: "";
}

.catena-transfer strong {
  color: var(--text);
  font: 650 0.68rem/1.5 var(--mono);
}

.catena-transfer span {
  font-size: 1.4rem;
  line-height: 1;
}

.catena-two-paths {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.catena-path {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.catena-path code {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--text);
  font-size: 0.72rem;
  white-space: normal;
}

.catena-path p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.catena-ending-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.4rem;
}

@media (max-width: 760px) {
  .catena-thesis,
  .catena-two-paths {
    grid-template-columns: 1fr;
  }

  .catena-boundary {
    width: 100%;
    grid-template-columns: 1fr;
    margin-right: 0;
    margin-left: 0;
    transform: none;
  }

  .catena-transfer {
    flex-direction: row;
  }

  .catena-transfer::before {
    width: 1px;
    height: 2.4rem;
  }

  .catena-transfer span {
    transform: rotate(90deg);
  }
}