.page-releases {
  --rel-no-w: calc(var(--space-4) + var(--space-1));
  --rel-indent: calc(var(--space-4) + var(--space-1) + var(--space-2));
  --rel-rail-item: calc(var(--space-8) + var(--space-8));
  background-color: var(--color-surface);
  color: var(--color-ink);
}

/* ---------- 首屏 ---------- */
.page-releases .rel-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-releases .rel-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-releases .rel-hero__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-releases .rel-hero__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-releases .rel-hero__inner {
  position: relative;
  z-index: 1;
  padding-top: calc(var(--space-8) + var(--space-4));
  padding-bottom: var(--space-6);
}

.page-releases .rel-hero__eyebrow {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

.page-releases .rel-hero__title {
  margin: var(--space-3) 0 var(--space-3);
  max-width: 10em;
  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-contrast-ink);
}

.page-releases .rel-hero__lead {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: 1.85;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.page-releases .rel-figs {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: var(--space-3) 0 0;
  border-top: var(--border-thin) solid var(--color-contrast-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-3);
}

.page-releases .rel-fig {
  min-width: 0;
}

.page-releases .rel-fig__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  color: var(--color-contrast-ink);
}

.page-releases .rel-fig__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}

/* ---------- 横向刻度时间轴 ---------- */
.page-releases .rel-rail {
  position: relative;
  z-index: 1;
  border-top: var(--border-thin) solid var(--color-contrast-line);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--color-contrast-line) transparent;
}

.page-releases .rel-rail__track {
  list-style: none;
  margin: 0;
  padding: 0 var(--space-2);
  display: flex;
  align-items: stretch;
  min-width: max-content;
}

.page-releases .rel-rail__item {
  position: relative;
  flex: 0 0 auto;
  width: var(--rel-rail-item);
  border-left: var(--border-thin) solid var(--color-contrast-line);
}

.page-releases .rel-rail__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: var(--border-thin);
  height: var(--space-2);
  background-color: var(--color-contrast-accent);
}

.page-releases .rel-rail__link {
  display: block;
  padding: var(--space-2) var(--space-2) var(--space-3);
  text-decoration: none;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.page-releases .rel-rail__link:hover,
.page-releases .rel-rail__link:focus-visible {
  color: var(--color-contrast-ink);
  background-color: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent);
}

.page-releases .rel-rail__link:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: calc(var(--space-1) / -2);
}

.page-releases .rel-rail__no {
  display: block;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.page-releases .rel-rail__name {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.5;
}

/* ---------- 阶段索引 ---------- */
.page-releases .rel-index {
  border-bottom: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface-alt);
}

.page-releases .rel-index__inner {
  padding-top: 0;
  padding-bottom: 0;
}

.page-releases .rel-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
}

.page-releases .rel-index__item {
  border-right: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-index__link {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  text-decoration: none;
  color: var(--color-ink-soft);
}

.page-releases .rel-index__link:hover {
  color: var(--color-primary);
}

.page-releases .rel-index__link:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: calc(var(--space-1) / -2);
}

.page-releases .rel-index__link[aria-current] {
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}

.page-releases .rel-index__no {
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

/* ---------- 阶段区块 ---------- */
.page-releases .rel-stage {
  padding-block: var(--section-y);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-stage__head {
  max-width: var(--measure);
}

.page-releases .rel-stage__head--split {
  max-width: none;
  display: grid;
  gap: var(--space-4);
}

.page-releases .rel-stage__kicker {
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-releases .rel-stage__seq {
  display: inline-block;
  padding: calc(var(--space-1) / 2) var(--space-1);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

.page-releases .rel-stage__title {
  margin: var(--space-3) 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-releases .rel-stage__lead {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-releases .rel-stage__lead a {
  color: var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-primary);
  text-decoration: none;
}

.page-releases .rel-stage__fig {
  margin: 0;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--color-surface-alt);
}

.page-releases .rel-stage__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-releases .rel-stage__fig figcaption {
  padding: var(--space-1) var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  font-style: italic;
  line-height: 1.7;
  color: var(--color-ink-muted);
}

.page-releases .rel-stage__fig--inset {
  margin-top: var(--space-4);
  max-width: 100%;
}

/* ---------- 节点列表 ---------- */
.page-releases .rel-nodes {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-node {
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-node__summary {
  display: grid;
  grid-template-columns: var(--rel-no-w) minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: start;
  padding: var(--space-3) 0;
  cursor: pointer;
  list-style: none;
}

.page-releases .rel-node__summary::-webkit-details-marker {
  display: none;
}

.page-releases .rel-node__summary:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: calc(var(--space-1) / 2);
}

.page-releases .rel-node__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--rel-no-w);
  padding: calc(var(--space-1) / 2) 0;
  font-size: var(--text-sm);
  line-height: 1;
  letter-spacing: 0.04em;
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
}

.page-releases .rel-node__head {
  min-width: 0;
}

.page-releases .rel-node__title {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.45;
  color: var(--color-ink);
}

.page-releases .rel-node__brief {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-releases .rel-node__glyph {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-primary);
}

.page-releases .rel-node__glyph::before {
  content: "+";
}

.page-releases .rel-node__det[open] .rel-node__glyph::before {
  content: "\2212";
}

.page-releases .rel-node__body {
  padding: 0 0 var(--space-4);
  padding-left: var(--rel-indent);
  display: grid;
  gap: var(--space-2);
  border-left: var(--border-thick) solid var(--color-primary);
  margin-left: 0;
}

.page-releases .rel-node__body p {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-releases .rel-node__body a {
  color: var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-primary);
  text-decoration: none;
}

/* ---------- 当前阶段：深色对比区 ---------- */
.page-releases .rel-stage--current {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-line);
}

.page-releases .rel-stage--current .rel-stage__kicker {
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.page-releases .rel-stage--current .rel-stage__seq--dark {
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
}

.page-releases .rel-stage--current .rel-stage__title {
  color: var(--color-contrast-ink);
}

.page-releases .rel-stage--current .rel-stage__lead {
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

.page-releases .rel-stage--current .rel-stage__fig {
  border-color: var(--color-contrast-line);
  background-color: color-mix(in srgb, var(--color-contrast-ink) 5%, transparent);
}

.page-releases .rel-stage--current .rel-stage__fig figcaption {
  border-top-color: var(--color-contrast-line);
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
}

.page-releases .rel-stage--current .rel-nodes {
  border-bottom-color: var(--color-contrast-line);
}

.page-releases .rel-stage--current .rel-node {
  border-top-color: var(--color-contrast-line);
}

.page-releases .rel-stage--current .rel-node__no {
  background-color: color-mix(in srgb, var(--color-contrast-accent) 24%, transparent);
  color: var(--color-contrast-accent);
  border-left-color: var(--color-contrast-accent);
}

.page-releases .rel-stage--current .rel-node__title {
  color: var(--color-contrast-ink);
}

.page-releases .rel-stage--current .rel-node__brief {
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.page-releases .rel-stage--current .rel-node__glyph {
  color: var(--color-contrast-accent);
}

.page-releases .rel-stage--current .rel-node__body {
  border-left-color: var(--color-contrast-accent);
}

.page-releases .rel-stage--current .rel-node__body p {
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

.page-releases .rel-stage--current .rel-node__body a {
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-accent);
}

/* ---------- 节点关系 ---------- */
.page-releases .rel-relate {
  padding-block: var(--section-y);
  background-color: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-relate__head {
  max-width: var(--measure);
}

.page-releases .rel-relate__kicker {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.page-releases .rel-relate__title {
  margin: var(--space-3) 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-releases .rel-relate__lead {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-releases .rel-relate__lead a {
  color: var(--color-primary);
  border-bottom: var(--border-thin) solid var(--color-primary);
  text-decoration: none;
}

.page-releases .rel-relate__grid {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-3);
}

.page-releases .rel-relate__cell {
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  min-width: 0;
}

.page-releases .rel-relate__celltitle {
  margin: 0 0 var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-releases .rel-chain,
.page-releases .rel-solo {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-releases .rel-chain__item {
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-chain__head {
  margin: 0 0 var(--space-1);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1);
}

.page-releases .rel-chain__from,
.page-releases .rel-chain__to {
  font-size: var(--text-sm);
  color: var(--color-primary);
}

.page-releases .rel-chain__arrow {
  color: var(--color-accent);
  font-size: var(--text-sm);
}

.page-releases .rel-chain__note {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-releases .rel-solo__item {
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-solo__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-releases .rel-solo__note {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

/* ---------- 收口 ---------- */
.page-releases .rel-next {
  padding-block: var(--section-y);
}

.page-releases .rel-next__box {
  padding: var(--space-4) var(--space-3);
  background-color: var(--color-primary-soft);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
}

.page-releases .rel-next__kicker {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.page-releases .rel-next__title {
  margin: var(--space-2) 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-releases .rel-next__lead {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-releases .rel-next__actions {
  margin-top: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-releases .rel-next__note {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  font-style: italic;
  color: var(--color-ink-muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-releases .rel-figs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-releases .rel-relate__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-releases .rel-next__box {
    padding: var(--space-6) var(--space-4);
  }
}

@media (min-width: 880px) {
  .page-releases .rel-hero__inner {
    padding-top: calc(var(--space-8) * 2);
    padding-bottom: var(--space-8);
  }

  .page-releases .rel-stage__head--split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
    align-items: start;
    gap: var(--space-6);
  }

  .page-releases .rel-stage__title {
    font-size: var(--text-4xl);
  }

  .page-releases .rel-stage__fig--inset {
    max-width: 78%;
  }

  .page-releases .rel-relate__title,
  .page-releases .rel-next__title {
    font-size: var(--text-3xl);
  }

  .page-releases .rel-node__body {
    padding-bottom: var(--space-6);
  }
}

@media (max-width: 420px) {
  .page-releases .rel-node__body {
    padding-left: var(--space-2);
  }

  .page-releases .rel-index__link {
    padding: var(--space-2);
  }
}
<<<END>>>