.page-releases {
  --rel-axis-w: 44px;
  --rel-axis-gap: var(--space-6);
  --rel-node-gap: var(--space-3);
}

.page-releases .rel-section {
  padding-block: var(--space-6);
}

@media (min-width: 900px) {
  .page-releases .rel-section {
    padding-block: var(--section-y);
  }
}

/* ---------- 首屏 ---------- */

.page-releases .releases-hero {
  padding-block: var(--space-4) var(--space-6);
}

@media (min-width: 900px) {
  .page-releases .releases-hero {
    padding-block: var(--space-6) var(--section-y-lg);
  }
}

.page-releases .releases-hero .crumbs {
  margin-bottom: var(--space-4);
}

.page-releases .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-releases .hero-axis {
  display: none;
}

@media (min-width: 768px) {
  .page-releases .hero-grid {
    grid-template-columns: var(--rel-axis-w) minmax(0, 1fr);
    gap: var(--rel-axis-gap);
  }

  .page-releases .hero-axis {
    display: block;
    align-self: stretch;
    min-height: 100%;
    border-left: var(--border-thin) solid var(--color-line);
    background-image: repeating-linear-gradient(
      to bottom,
      var(--color-line) 0,
      var(--color-line) 1px,
      transparent 1px,
      transparent 32px
    );
    background-repeat: no-repeat;
    background-size: 12px 100%;
    background-position: left top;
  }
}

.page-releases .hero-main {
  display: grid;
  gap: var(--space-3);
  min-width: 0;
}

.page-releases .hero-main .eyebrow {
  margin: 0;
}

.page-releases .hero-main .display-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  max-width: 22ch;
}

.page-releases .hero-split {
  display: grid;
  gap: var(--space-4);
  align-items: start;
}

@media (min-width: 900px) {
  .page-releases .hero-split {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: var(--space-6);
  }
}

.page-releases .hero-copy {
  display: grid;
  gap: var(--space-2);
}

.page-releases .hero-copy .lede {
  margin: 0;
  max-width: var(--measure);
}

.page-releases .hero-note {
  margin: 0;
  max-width: var(--measure);
  padding-left: var(--space-2);
  border-left: 3px solid var(--color-primary);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-releases .hero-shot {
  margin: 0;
}

.page-releases .hero-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-releases .hero-kpis {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: var(--space-2);
  background-color: var(--color-line);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

@media (min-width: 760px) {
  .page-releases .hero-kpis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-releases .hero-kpi {
  display: grid;
  gap: 2px;
  padding: var(--space-3);
  background-color: var(--color-surface);
}

.page-releases .hero-kpi .num {
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-releases .hero-kpi-label {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-releases .hero-kpi-note {
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
}

/* ---------- 阶段带 ---------- */

.page-releases .phase-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 760px) {
  .page-releases .phase-band {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.page-releases .phase-band li {
  position: relative;
  display: grid;
  gap: 2px;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .phase-band li::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 2px;
  height: 9px;
  background-color: var(--color-line);
}

.page-releases .phase-band li.is-current {
  border-top-color: var(--color-primary);
}

.page-releases .phase-band li.is-current::before {
  height: 16px;
  background-color: var(--color-primary);
}

.page-releases .phase-name {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-releases .phase-band li.is-current .phase-name {
  color: var(--color-primary);
}

.page-releases .phase-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}

/* ---------- 文档布局与左轨 ---------- */

.page-releases .doc-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

@media (min-width: 960px) {
  .page-releases .doc-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: var(--gutter);
  }
}

.page-releases .toc-rail {
  min-width: 0;
}

@media (min-width: 960px) {
  .page-releases .toc-rail {
    position: sticky;
    top: var(--space-6);
    align-self: start;
    padding-right: var(--space-3);
    border-right: var(--border-thin) solid var(--color-line);
    max-height: calc(100vh - var(--space-8));
    overflow-y: auto;
  }
}

.page-releases .toc-rail-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-releases .toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-releases .rail-link {
  display: flex;
  gap: var(--space-1);
  align-items: baseline;
  padding: 6px var(--space-1);
  border-left: 3px solid transparent;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 120ms linear, border-color 180ms linear, background-color 120ms linear;
}

.page-releases .rail-link:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}

.page-releases .rail-link.is-current {
  border-left-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
  font-weight: var(--weight-heading);
}

.page-releases .rail-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}

.page-releases .doc-main {
  min-width: 0;
}

/* ---------- 章节标题 ---------- */

.page-releases .sec-kicker {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-releases .sec-title {
  position: relative;
  margin: 0 0 var(--space-3);
  padding-left: var(--space-2);
  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);
  max-width: 30ch;
}

.page-releases .sec-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.16em;
  bottom: 0.16em;
  width: 3px;
  background-color: var(--color-primary);
}

.page-releases .sec-intro {
  margin: 0 0 var(--space-3);
  color: var(--color-ink-soft);
}

/* ---------- 时间线 ---------- */

.page-releases #track-base .timeline .tl-node { --rel-node-gap: var(--space-3); }
.page-releases #track-metrics .timeline .tl-node { --rel-node-gap: var(--space-4); }
.page-releases #track-client .timeline .tl-node { --rel-node-gap: var(--space-6); }

.page-releases .timeline {
  margin: var(--space-4) 0 0;
  padding: 0 0 0 var(--space-3);
  list-style: none;
  border-left: var(--border-thin) solid var(--color-line);
}

.page-releases .tl-node {
  position: relative;
  padding-block: var(--space-2);
  min-width: 0;
}

.page-releases .tl-node + .tl-node {
  margin-top: var(--rel-node-gap);
}

.page-releases .tl-node::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-3) - 4px);
  top: calc(var(--space-2) + 8px);
  width: 8px;
  height: 8px;
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-ink-muted);
  transition: background-color 180ms linear, border-color 180ms linear;
}

.page-releases .tl-node.state-current::before {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.page-releases .tl-node.state-rolling::before {
  background-color: var(--color-surface);
  border-color: var(--color-accent);
}

.page-releases .tl-node:hover::before {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.page-releases .tl-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-1);
}

.page-releases .tl-phase {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-releases .node-state {
  display: inline-block;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  background-color: var(--color-surface-alt);
}

.page-releases .state-current .node-state {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-releases .state-rolling .node-state {
  background-color: var(--color-surface);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.page-releases .tl-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-releases .tl-text {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  color: var(--color-ink);
}

.page-releases .tl-result {
  margin: 0;
  padding-left: var(--space-2);
  border-left: 3px solid var(--color-primary);
  max-width: var(--measure);
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.page-releases .tl-result b {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-releases .tl-scope {
  display: inline-block;
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}

/* ---------- 窄注释 ---------- */

.page-releases .rail-note {
  margin: var(--space-4) 0;
  padding-left: var(--space-2);
  border-left: 3px solid var(--color-accent);
  max-width: 58ch;
}

.page-releases .rail-note p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ---------- 对照表 ---------- */

.page-releases .board-figure {
  margin: var(--space-4) 0;
}

.page-releases .board-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-releases .media-tag {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  margin-top: var(--space-1);
  padding: 4px 8px;
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-soft);
}

.page-releases .media-tag-num {
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
  letter-spacing: 0.06em;
}

.page-releases .change-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
}

.page-releases .change-filters .chip {
  font-family: var(--font-heading);
}

.page-releases .table-scroll {
  overflow-x: auto;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .field-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.page-releases .field-table caption {
  caption-side: top;
  text-align: left;
  padding: var(--space-2) 0;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-releases .field-table th,
.page-releases .field-table td {
  padding: var(--space-2);
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .field-table thead th {
  background-color: var(--color-surface-deep);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  white-space: nowrap;
}

.page-releases .field-table tbody tr {
  transition: background-color 120ms linear;
}

.page-releases .field-table tbody tr:hover {
  background-color: var(--color-primary-soft);
}

.page-releases .field-table tbody tr.is-replaced {
  background-color: var(--color-highlight);
}

.page-releases .field-table tbody tr.is-replaced:hover {
  background-color: var(--color-highlight);
}

.page-releases .field-table td:nth-child(3),
.page-releases .field-table td:nth-child(4) {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
  white-space: nowrap;
}

/* ---------- 回看与纠错 ---------- */

.page-releases .lookback-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-4);
}

@media (min-width: 860px) {
  .page-releases .lookback-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--space-6);
  }
}

.page-releases .lookback-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-3);
}

.page-releases .lookback-steps li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: var(--space-2);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .step-num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-releases .lookback-steps h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-releases .lookback-steps p {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-releases .t-link {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: border-color 120ms linear;
}

.page-releases .t-link:hover {
  border-bottom-color: var(--color-primary);
}

.page-releases .lookback-side {
  display: grid;
  gap: var(--space-4);
  align-content: start;
  min-width: 0;
}

.page-releases .contact-panel {
  padding: var(--space-3);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-md);
}

.page-releases .contact-panel-title {
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
}

.page-releases .contact-list {
  margin: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-1) var(--space-2);
  font-size: var(--text-sm);
}

.page-releases .contact-list dt {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
  opacity: 0.66;
  white-space: nowrap;
}

.page-releases .contact-list dd {
  margin: 0;
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.page-releases .contact-list .t-link {
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-line);
}

.page-releases .contact-list .t-link:hover {
  border-bottom-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

.page-releases .contact-note {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

.page-releases .closing-note {
  margin: var(--space-6) 0 0;
  padding-left: var(--space-2);
  border-left: 3px solid var(--color-accent);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

@media (prefers-reduced-motion: reduce) {
  .page-releases .rail-link,
  .page-releases .tl-node::before,
  .page-releases .field-table tbody tr,
  .page-releases .t-link {
    transition-duration: 0ms;
  }
}
</main>