.page-process-checkpoints {
  --cp-rail: clamp(6.5rem, 11vw, 8.5rem);
  --cp-dot: var(--space-1);
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-process-checkpoints .cp-head {
  position: relative;
  padding-block: var(--space-6) var(--space-8);
}

.page-process-checkpoints .eyebrow {
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.page-process-checkpoints .cp-title {
  margin: 0 0 var(--space-4);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: min(var(--text-2xl), 9vw);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  max-width: 22ch;
}

.page-process-checkpoints .cp-lede {
  margin: 0;
  max-width: 48ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-process-checkpoints .cp-section {
  padding-block: var(--section-y);
}

.page-process-checkpoints .cp-section--alt {
  background: var(--color-surface-alt);
}

.page-process-checkpoints .cp-section--deep {
  background: var(--color-surface-deep);
}

.page-process-checkpoints .section-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: min(var(--text-xl), 7vw);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  max-width: 24ch;
}

.page-process-checkpoints .cp-prose p {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-base);
  color: var(--color-ink);
}

.page-process-checkpoints .cp-prose p:last-child {
  margin-bottom: 0;
}

/* 节点与流程步骤对应表 */
.page-process-checkpoints .step-map {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-1);
  max-width: 40rem;
}

.page-process-checkpoints .step-map-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-process-checkpoints .step-map-node {
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

.page-process-checkpoints .step-map-line {
  height: var(--border-thin);
  background: var(--color-line);
}

.page-process-checkpoints .step-map-step {
  color: var(--color-ink-muted);
  letter-spacing: 0.04em;
}

/* 图录 */
.page-process-checkpoints .cp-figure {
  margin: var(--space-6) 0 0;
}

.page-process-checkpoints .cp-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--color-surface-deep);
}

.page-process-checkpoints .cp-figure figcaption {
  margin-top: var(--space-2);
  width: min(100%, 44ch);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.page-process-checkpoints .cp-figure--wide {
  margin-top: var(--space-8);
}

/* 节点序列 */
.page-process-checkpoints .nodes {
  display: grid;
  gap: var(--space-8);
  margin-top: var(--space-6);
}

.page-process-checkpoints .node {
  position: relative;
}

.page-process-checkpoints .node-head {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-process-checkpoints .node-head::before {
  content: "";
  position: absolute;
  top: calc(-1 * var(--cp-dot) / 2);
  left: 0;
  width: var(--cp-dot);
  height: var(--cp-dot);
  background: var(--color-primary);
}

.page-process-checkpoints .node-index {
  grid-row: 1 / span 2;
  align-self: start;
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  line-height: 1;
  letter-spacing: 0.08em;
}

.page-process-checkpoints .node-title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: min(var(--text-lg), 5.6vw);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-process-checkpoints .node-meta {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

/* 节点字段展签 */
.page-process-checkpoints .node-ledger {
  margin: var(--space-4) 0 0;
  display: grid;
  gap: 0;
}

.page-process-checkpoints .ledger-row {
  display: grid;
  gap: var(--space-1);
  padding-block: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-process-checkpoints .ledger-row:first-child {
  border-top: var(--border-thin) solid var(--color-line);
}

.page-process-checkpoints .ledger-label {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.page-process-checkpoints .ledger-value {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  color: var(--color-ink);
}

.page-process-checkpoints .ledger-row--writeback .ledger-label,
.page-process-checkpoints .ledger-row--writeback .ledger-value {
  transition: color 180ms ease-out;
}

.page-process-checkpoints .node:hover .ledger-row--writeback .ledger-label,
.page-process-checkpoints .node:hover .ledger-row--writeback .ledger-value,
.page-process-checkpoints .node:focus-within .ledger-row--writeback .ledger-label,
.page-process-checkpoints .node:focus-within .ledger-row--writeback .ledger-value {
  color: var(--color-primary);
}

.page-process-checkpoints .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* 依赖清单 */
.page-process-checkpoints .dep-list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-process-checkpoints .dep-item {
  display: grid;
  gap: var(--space-1);
  padding-block: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-process-checkpoints .dep-pair {
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-primary);
}

.page-process-checkpoints .dep-note {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  color: var(--color-ink);
}

.page-process-checkpoints .cp-note {
  margin-top: var(--space-8);
  padding-left: var(--space-4);
  border-left: var(--border-thin) solid var(--color-accent);
}

.page-process-checkpoints .cp-note-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-process-checkpoints .cp-note-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
  max-width: var(--measure);
}

.page-process-checkpoints .cp-note-list li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-base);
  color: var(--color-ink);
}

.page-process-checkpoints .cp-note-list li::before {
  content: "";
  position: absolute;
  top: 0.75em;
  left: 0;
  width: var(--cp-dot);
  height: var(--cp-dot);
  background: var(--color-ink-muted);
}

/* 相邻入口 */
.page-process-checkpoints .next-list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-process-checkpoints .next-item {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-process-checkpoints .next-link {
  display: grid;
  gap: var(--space-1);
  padding-block: var(--space-3);
  color: inherit;
  text-decoration: none;
}

.page-process-checkpoints .next-label {
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

.page-process-checkpoints .next-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-primary);
  text-decoration-thickness: var(--border-thin);
  text-underline-offset: 0.25em;
}

.page-process-checkpoints .next-desc {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-process-checkpoints .next-link:hover .next-title,
.page-process-checkpoints .next-link:focus-visible .next-title {
  text-decoration-color: var(--color-accent);
}

.page-process-checkpoints a:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: 3px;
}

/* 移动端优先的栅格与错位 */
@media (min-width: 720px) {
  .page-process-checkpoints .ledger-row {
    grid-template-columns: var(--cp-rail) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: baseline;
  }

  .page-process-checkpoints .dep-item {
    grid-template-columns: minmax(0, 20rem) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: baseline;
  }

  .page-process-checkpoints .cp-figure figcaption {
    margin-left: var(--space-6);
  }
}

@media (min-width: 900px) {
  .page-process-checkpoints .cp-head {
    padding-block: var(--space-8) var(--section-y);
  }

  .page-process-checkpoints .nodes {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: var(--space-8) var(--gutter);
  }

  .page-process-checkpoints .nodes > .node {
    grid-column: 1 / 11;
  }

  .page-process-checkpoints .nodes > .node:nth-of-type(even) {
    grid-column: 3 / 13;
  }

  .page-process-checkpoints .nodes > .cp-figure {
    grid-column: 2 / 12;
  }

  .page-process-checkpoints .next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-8);
  }
}

@media (min-width: 1140px) {
  .page-process-checkpoints .next-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-process-checkpoints .cp-figure figcaption {
    margin-left: var(--space-8);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-process-checkpoints .ledger-row--writeback .ledger-label,
  .page-process-checkpoints .ledger-row--writeback .ledger-value {
    transition: none;
  }
}