.nest-checkpoint-list {
  --checkpoint-complete: #4f7960;
  --checkpoint-waiting: #8a7045;
  --checkpoint-blocked: #8a624f;
  --checkpoint-failed: #965c5c;
  --checkpoint-unknown: var(--text-secondary);
  display: grid;
  gap: 10px;
  width: 100%;
}

.nest-checkpoint {
  overflow: clip;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 16px;
  box-shadow: 0 8px 26px rgba(61, 61, 61, 0.06);
  backdrop-filter: blur(18px) saturate(1.1);
  -webkit-backdrop-filter: blur(18px) saturate(1.1);
}

.nest-checkpoint-summary {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-height: 64px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
}

.nest-checkpoint-summary::-webkit-details-marker { display: none; }

.nest-checkpoint-summary:focus-visible {
  outline: 3px solid var(--accent);
  outline: 3px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: -3px;
}

.nest-checkpoint-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border: 1px solid currentColor;
  border-radius: 999px;
  color: var(--checkpoint-unknown);
  font-size: 0.95rem;
  font-weight: 700;
}

.nest-checkpoint[data-state="complete"] .nest-checkpoint-icon { color: var(--checkpoint-complete); }
.nest-checkpoint[data-state="waiting"] .nest-checkpoint-icon { color: var(--checkpoint-waiting); }
.nest-checkpoint[data-state="blocked"] .nest-checkpoint-icon { color: var(--checkpoint-blocked); }
.nest-checkpoint[data-state="failed"] .nest-checkpoint-icon { color: var(--checkpoint-failed); }
.nest-checkpoint[data-state="unknown"] .nest-checkpoint-icon { color: var(--checkpoint-unknown); }

.nest-checkpoint-copy {
  display: grid;
  min-width: 0;
  gap: 2px;
}

.nest-checkpoint-copy strong {
  overflow: hidden;
  font-size: 0.94rem;
  font-weight: 650;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nest-checkpoint-copy > span {
  color: var(--text-secondary);
  font-size: 0.79rem;
  line-height: 1.4;
}

.nest-checkpoint-status {
  color: var(--text-secondary);
  font-size: 0.72rem;
  white-space: nowrap;
}

.nest-checkpoint-details {
  display: grid;
  gap: 12px;
  padding: 0 14px 14px 58px;
}

.nest-checkpoint-facts {
  display: grid;
  grid-template-columns: minmax(64px, auto) minmax(0, 1fr);
  gap: 5px 12px;
  padding-top: 10px;
  border-top: 1px solid rgba(128, 128, 128, 0.16);
  font-size: 0.78rem;
}

.nest-checkpoint-facts dt { color: var(--text-secondary); }
.nest-checkpoint-facts dd { overflow-wrap: anywhere; }
.nest-checkpoint-details h4 { font-size: 0.78rem; font-weight: 650; }

.nest-checkpoint-evidence {
  display: grid;
  gap: 8px;
  list-style: none;
}

.nest-checkpoint-evidence li {
  display: grid;
  gap: 2px;
  padding-left: 10px;
  border-left: 2px solid rgba(128, 128, 128, 0.2);
  font-size: 0.78rem;
}

.nest-checkpoint-evidence span,
.nest-checkpoint-evidence small { overflow-wrap: anywhere; }
.nest-checkpoint-evidence small { color: var(--text-secondary); }
.nest-checkpoint-empty { padding: 14px; color: var(--text-secondary); font-size: 0.85rem; }

[data-theme="night"] .nest-checkpoint {
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.16);
}

@media (max-width: 600px) {
  .nest-checkpoint-summary { grid-template-columns: 32px minmax(0, 1fr); }
  .nest-checkpoint-status { grid-column: 2; }
  .nest-checkpoint-details { padding-left: 56px; }
}

@media (prefers-reduced-motion: reduce) {
  .nest-checkpoint,
  .nest-checkpoint-summary { scroll-behavior: auto; transition: none; }
}