.page-process-checkpoints {
  --cp-rail-w: 88px;
  --cp-dot: color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.page-process-checkpoints [id] {
  scroll-margin-top: var(--space-8);
}

.page-process-checkpoints .cp-crumb {
  padding-top: var(--space-4);
}

/* ---------- 栅格与左编号列 ---------- */

.page-process-checkpoints .cp-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
}

.page-process-checkpoints .cp-rail {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) dotted var(--color-line);
  min-width: 0;
}

.page-process-checkpoints .cp-rail-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.page-process-checkpoints .index-tag {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--cp-dot);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
}

.page-process-checkpoints .index-tag-accent {
  background: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 32%, transparent);
  color: var(--color-accent);
}

@media (min-width: 768px) {
  .page-process-checkpoints .cp-grid {
    grid-template-columns: var(--cp-rail-w) minmax(0, 1fr);
    gap: var(--space-6);
  }

  .page-process-checkpoints .cp-rail {
    position: sticky;
    top: var(--space-6);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    padding: 0 0 0 var(--space-3);
    border-bottom: none;
    border-left: var(--border-thick) solid var(--color-primary);
  }

  .page-process-checkpoints .cp-rail-label {
    writing-mode: vertical-rl;
    letter-spacing: 0.26em;
  }
}

/* ---------- 首屏 ---------- */

.page-process-checkpoints .cp-hero {
  padding-top: var(--space-6);
  padding-bottom: var(--section-y);
}

.page-process-checkpoints .cp-kicker {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-primary);
  margin: 0 0 var(--space-2);
}

.page-process-checkpoints .cp-h1 {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-3);
  max-width: 22ch;
}

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

.page-process-checkpoints .cp-phase {
  display: flex;
  gap: var(--space-2);
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: var(--space-3) 0 0;
  border-top: var(--border-thin) dotted var(--color-line);
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-process-checkpoints .cp-phase-step {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  white-space: nowrap;
}

.page-process-checkpoints .cp-phase-step .mono {
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  color: var(--color-ink-muted);
}

.page-process-checkpoints .cp-phase-step.is-current {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-weight: var(--weight-heading);
  box-shadow: var(--shadow-2);
}

.page-process-checkpoints .cp-phase-step.is-current .mono {
  color: var(--color-primary-ink);
}

/* ---------- 区块节奏 ---------- */

.page-process-checkpoints .cp-section {
  padding: var(--section-y) 0;
}

.page-process-checkpoints .cp-section-lg {
  padding: var(--section-y-lg) 0;
}

.page-process-checkpoints .cp-body {
  min-width: 0;
}

.page-process-checkpoints .cp-body h2 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-3);
}

.page-process-checkpoints .cp-body h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0;
}

.page-process-checkpoints .cp-body p {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  margin: 0 0 var(--space-3);
  max-width: var(--measure);
}

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

.page-process-checkpoints .cp-body a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}

.page-process-checkpoints .cp-body strong {
  color: var(--color-ink);
  font-weight: var(--weight-heading);
}

/* ---------- 图片 ---------- */

.page-process-checkpoints .cp-wide-figure,
.page-process-checkpoints .cp-inline-figure,
.page-process-checkpoints .cp-return-figure {
  margin: 0;
}

.page-process-checkpoints .cp-wide-figure {
  padding-bottom: var(--space-3);
}

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

.page-process-checkpoints .media-frame {
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-surface-deep);
}

.page-process-checkpoints .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-process-checkpoints .media-caption {
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
  margin-top: var(--space-2);
  max-width: var(--measure);
}

/* ---------- 六类节点 ---------- */

.page-process-checkpoints .cp-nodes {
  margin-top: var(--space-4);
}

.page-process-checkpoints .cp-node {
  padding-top: var(--space-3);
  margin-bottom: var(--space-6);
  border-top: var(--border-thin) dotted var(--color-line);
}

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

.page-process-checkpoints .cp-node-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.page-process-checkpoints .cp-node-code {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  color: var(--color-primary);
  text-decoration: none;
  padding-right: var(--space-2);
  border-right: var(--border-thick) solid var(--color-primary);
  line-height: 1;
}

.page-process-checkpoints .cp-fields {
  margin: 0;
  display: grid;
  gap: var(--space-2);
}

.page-process-checkpoints .cp-field {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
}

.page-process-checkpoints .cp-field dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-process-checkpoints .cp-field dd {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  max-width: var(--measure);
}

.page-process-checkpoints .cp-field-warn dt {
  color: var(--color-accent);
}

.page-process-checkpoints .cp-field-warn dd {
  background: var(--color-highlight);
  border-radius: var(--radius-pill);
  padding: var(--space-2) var(--space-3);
}

@media (min-width: 640px) {
  .page-process-checkpoints .cp-field {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: var(--space-3);
  }

  .page-process-checkpoints .cp-field dt {
    padding-top: 0.25em;
  }
}

/* ---------- 阈值与容差 ---------- */

.page-process-checkpoints .cp-thresholds {
  list-style: none;
  margin: var(--space-4) 0 var(--space-4);
  padding: 0;
  max-width: var(--measure);
}

.page-process-checkpoints .cp-thresholds li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-top: var(--border-thin) dotted var(--color-line);
}

.page-process-checkpoints .cp-thresholds li:last-child {
  border-bottom: var(--border-thin) dotted var(--color-line);
}

.page-process-checkpoints .cp-thresh-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  color: var(--color-accent);
  padding-top: 0.35em;
}

.page-process-checkpoints .cp-thresholds p {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-process-checkpoints .cp-thresholds strong {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  margin-bottom: var(--space-1);
}

/* ---------- 异常回流（深色带） ---------- */

.page-process-checkpoints .cp-night {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-process-checkpoints .cp-night .cp-rail {
  border-bottom-color: var(--color-contrast-line);
}

.page-process-checkpoints .cp-night .cp-rail-label {
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.page-process-checkpoints .cp-night .index-tag {
  background: color-mix(in srgb, var(--color-contrast-accent) 20%, transparent);
  border-color: color-mix(in srgb, var(--color-contrast-accent) 48%, transparent);
  color: var(--color-contrast-accent);
}

.page-process-checkpoints .cp-night .cp-body h2,
.page-process-checkpoints .cp-night .cp-body strong {
  color: var(--color-contrast-ink);
}

.page-process-checkpoints .cp-night .cp-body p {
  color: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent);
}

.page-process-checkpoints .cp-night .cp-body a {
  color: var(--color-contrast-accent);
}

.page-process-checkpoints .cp-night .media-caption {
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

@media (min-width: 768px) {
  .page-process-checkpoints .cp-night .cp-rail {
    border-left-color: var(--color-contrast-accent);
    border-bottom-color: transparent;
  }
}

.page-process-checkpoints .cp-flow {
  display: block;
  width: 100%;
  max-width: 720px;
  height: auto;
  margin: var(--space-4) 0 var(--space-6);
  overflow: visible;
}

.page-process-checkpoints .cp-flow-axis {
  stroke: var(--color-contrast-line);
  stroke-width: 2;
}

.page-process-checkpoints .cp-flow-return {
  fill: none;
  stroke: var(--color-contrast-accent);
  stroke-width: 2;
  stroke-dasharray: 6 5;
}

.page-process-checkpoints .cp-flow-dot circle {
  fill: var(--color-primary);
}

.page-process-checkpoints .cp-flow-label text {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  fill: var(--color-contrast-ink);
  letter-spacing: 0.02em;
}

.page-process-checkpoints .cp-flow-label .cp-flow-note {
  fill: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

.page-process-checkpoints .cp-return-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
}

.page-process-checkpoints .cp-return-text p {
  margin: 0 0 var(--space-3);
  max-width: var(--measure);
}

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

@media (min-width: 900px) {
  .page-process-checkpoints .cp-return-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: var(--space-6);
  }
}

/* ---------- 相邻主题 ---------- */

.page-process-checkpoints .cp-nearby {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.page-process-checkpoints .cp-nearby .btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  background: var(--color-surface-alt);
  transition: border-color 160ms ease, background-color 160ms ease;
}

.page-process-checkpoints .cp-nearby .btn:hover,
.page-process-checkpoints .cp-nearby .btn:focus-visible {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.page-process-checkpoints a:focus-visible,
.page-process-checkpoints .btn:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .page-process-checkpoints .cp-nearby .btn {
    transition: none;
  }
}
<<<END>>>