/* Landing page — diagram index */

.landing-main {
  padding-block: 1.75rem 2.5rem;
}

.landing-lede {
  max-width: 56ch;
  margin-bottom: 2rem;
}

.boss-index {
  max-width: 920px;
}

.boss-group + .boss-group {
  margin-top: 2.25rem;
  padding-top: 2.25rem;
  border-top: 1px solid var(--border);
}

.boss-group:first-child {
  padding-top: 0;
}

.boss-group-heading {
  margin: 0 0 1rem;
  font-family: var(--font-primary);
  font-size: 1.35rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.35;
  color: var(--text-primary);
}

.boss-group-empty {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-style: italic;
}

.diagram-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
}

.diagram-list > li {
  display: flex;
}

.diagram-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  width: 100%;
  flex: 1;
  padding: 24px 22px 22px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease, background 0.15s ease;
}

a.diagram-card:hover {
  border-color: rgba(15, 176, 162, 0.45);
  background: #141a22;
}

.diagram-card--soon {
  opacity: 0.72;
  cursor: default;
}

.diagram-card-thumb {
  display: block;
  width: 168px;
  height: 168px;
  border-radius: 50%;
  flex-shrink: 0;
}

.diagram-card-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  flex: 1;
  min-width: 0;
  width: 100%;
  text-align: center;
}

.diagram-card-title {
  font-family: var(--font-primary);
  font-size: 1.25rem;
  color: var(--text-primary);
  line-height: 1.35;
}

.diagram-card-desc,
.diagram-card-soon {
  min-height: 4.8em;
  margin-top: auto;
}

.diagram-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 28ch;
}

.diagram-card-soon {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mark);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--gold);
  opacity: 0.75;
}

@media (min-width: 640px) {
  .diagram-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .diagram-card {
    padding: 20px 18px 18px;
  }

  .diagram-card-thumb {
    width: 144px;
    height: 144px;
  }
}