.page-releases {
  --rel-rail-w: 168px;
  --rel-gap: var(--space-4);
  --rel-divider: var(--color-line);
  --rel-pad-x: var(--space-3);
  background: var(--color-surface);
  color: var(--color-ink);
}

/* ---------- 首屏 ---------- */

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

.page-releases .rel-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.page-releases .rel-hero__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  z-index: 1;
}

.page-releases .rel-hero__inner {
  position: relative;
  z-index: 2;
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.page-releases .rel-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, var(--color-contrast-surface));
}

.page-releases .rel-crumb li + li::before {
  content: "/";
  margin-right: var(--space-2);
  opacity: 0.55;
}

.page-releases .rel-crumb a {
  color: inherit;
  text-decoration: none;
}

.page-releases .rel-crumb a:hover,
.page-releases .rel-crumb a:focus-visible {
  color: var(--color-contrast-accent);
}

.page-releases .rel-hero__eyebrow {
  margin: var(--space-4) 0 0;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-contrast-accent);
}

.page-releases .rel-hero__title {
  margin: var(--space-2) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.92;
  letter-spacing: var(--tracking-heading);
  color: var(--color-primary-ink);
}

.page-releases .rel-hero__lede {
  max-width: var(--measure);
  margin: var(--space-4) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 88%, var(--color-contrast-surface));
}

.page-releases .rel-hero__figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  margin: var(--space-6) 0 0;
}

.page-releases .rel-fig {
  min-width: 0;
  padding-top: var(--space-2);
}

.page-releases .rel-fig__val {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  margin: 0;
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  font-size: var(--text-figure);
  line-height: 1;
  color: var(--color-contrast-accent);
}

.page-releases .rel-fig__unit {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-contrast-ink);
}

.page-releases .rel-fig__cap {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, var(--color-contrast-surface));
}

.page-releases .rel-tape {
  display: grid;
  grid-template-columns: repeat(15, minmax(0, 1fr));
  gap: 4px;
  align-items: end;
  height: 26px;
  margin-top: var(--space-6);
}

.page-releases .rel-tape span {
  display: block;
  height: 8px;
  background: color-mix(in srgb, var(--color-contrast-ink) 32%, transparent);
}

.page-releases .rel-tape span:nth-child(3n + 1) {
  height: 26px;
  background: var(--color-primary);
}

/* ---------- 主体骨架 ---------- */

.page-releases .rel-body {
  background: var(--color-surface);
}

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

.page-releases .rel-rail {
  padding: var(--space-4) 0 0;
}

.page-releases .rel-rail__label {
  margin: 0 0 var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}

.page-releases .rel-rail__list {
  display: flex;
  gap: var(--space-2);
  margin: 0;
  padding: 0 0 var(--space-1);
  list-style: none;
  overflow-x: auto;
}

.page-releases .rel-rail__item a {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  white-space: nowrap;
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink-soft);
  border-bottom: 2px solid transparent;
}

.page-releases .rel-rail__item a:hover,
.page-releases .rel-rail__item a:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

.page-releases .rel-rail__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
}

/* ---------- 筛选条 ---------- */

.page-releases .rel-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-2);
  padding: var(--space-3) var(--rel-pad-x);
  background: var(--color-surface-deep);
}

.page-releases .rel-filter .filter-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px var(--space-2);
  border: 0;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  cursor: pointer;
}

.page-releases .rel-filter .filter-chip[aria-pressed="true"],
.page-releases .rel-filter .filter-chip.is-active {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-releases .rel-filter .filter-chip:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-releases .rel-filter .filter-chip b {
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
}

.page-releases .rel-filter .filter-empty {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ---------- 阶段 ---------- */

.page-releases .rel-stage {
  position: relative;
  padding: var(--space-6) var(--rel-pad-x);
}

.page-releases .rel-stage--a {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  --rel-divider: color-mix(in srgb, var(--color-primary-ink) 30%, var(--color-primary));
}

.page-releases .rel-stage--b {
  background: var(--color-surface-alt);
  color: var(--color-ink);
  --rel-divider: var(--color-line);
}

.page-releases .rel-stage--c {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  overflow: hidden;
  --rel-divider: color-mix(in srgb, var(--color-contrast-ink) 24%, var(--color-contrast-surface));
}

.page-releases .rel-stage__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.page-releases .rel-stage__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  z-index: 1;
}

.page-releases .rel-stage--c > .rel-stage__head,
.page-releases .rel-stage--c > .rel-nodes,
.page-releases .rel-stage--c > .rel-yield {
  position: relative;
  z-index: 2;
}

.page-releases .rel-stage__head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.page-releases .rel-stage__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: 1;
}

.page-releases .rel-stage--a .rel-stage__idx { color: var(--color-accent); }
.page-releases .rel-stage--b .rel-stage__idx { color: var(--color-primary); }
.page-releases .rel-stage--c .rel-stage__idx { color: var(--color-contrast-accent); }

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

.page-releases .rel-stage__span {
  margin: var(--space-1) 0 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  opacity: 0.92;
}

.page-releases .rel-stage__note {
  max-width: var(--measure);
  margin: var(--space-2) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  opacity: 0.82;
}

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

.page-releases .rel-stage__figure {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

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

/* ---------- 节点 ---------- */

.page-releases .rel-nodes {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-releases .rel-node {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: var(--space-2);
  padding: var(--space-3) var(--space-1);
  border-top: 1px solid var(--rel-divider);
  transition: background-color 200ms linear;
}

.page-releases .rel-node:last-child {
  border-bottom: 1px solid var(--rel-divider);
}

.page-releases .rel-stage--a .rel-node.is-hit { background: color-mix(in srgb, var(--color-primary-ink) 16%, var(--color-primary)); }
.page-releases .rel-stage--b .rel-node.is-hit { background: var(--color-highlight); }
.page-releases .rel-stage--c .rel-node.is-hit { background: color-mix(in srgb, var(--color-contrast-accent) 22%, var(--color-contrast-surface)); }

.page-releases .rel-node__id {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  white-space: nowrap;
  opacity: 0.66;
}

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

.page-releases .rel-node__top {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  align-items: baseline;
  justify-content: space-between;
}

.page-releases .rel-node__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

.page-releases .rel-node__status {
  flex: none;
  display: inline-block;
  padding: 2px var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  white-space: nowrap;
  border-radius: var(--radius-sm);
}

.page-releases .rel-stage--a .rel-node__status {
  background: var(--color-primary-ink);
  color: var(--color-primary);
}

.page-releases .rel-stage--a .rel-node__status--live {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-releases .rel-stage--b .rel-node__status {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.page-releases .rel-stage--b .rel-node__status--live {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-releases .rel-stage--c .rel-node__status {
  background: color-mix(in srgb, var(--color-contrast-ink) 20%, var(--color-contrast-surface));
  color: var(--color-contrast-ink);
}

.page-releases .rel-stage--c .rel-node__status--live {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}

.page-releases .rel-node__meta {
  max-width: 62ch;
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  opacity: 0.84;
}

.page-releases .rel-node__more {
  margin-top: var(--space-2);
}

.page-releases .rel-node__more > summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  opacity: 0.86;
}

.page-releases .rel-node__more > summary::-webkit-details-marker {
  display: none;
}

.page-releases .rel-node__more > summary::before {
  content: "+";
  display: inline-block;
  width: 1em;
  text-align: center;
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
}

.page-releases .rel-node__more[open] > summary::before {
  content: "–";
}

.page-releases .rel-node__more > summary:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-releases .rel-node__more-body {
  padding-top: var(--space-1);
}

.page-releases .rel-node__more-body p {
  max-width: 62ch;
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  opacity: 0.88;
}

.page-releases .rel-node__more-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 通用内链 ---------- */

.page-releases .rel-inline {
  color: inherit;
  font-weight: var(--weight-heading);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-releases .rel-stage--c .rel-inline {
  text-decoration-color: var(--color-contrast-accent);
}

.page-releases .rel-inline:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 阶段成果 ---------- */

.page-releases .rel-yield {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  margin: var(--space-4) 0 0;
  padding: var(--space-3) var(--space-3) var(--space-3) calc(var(--space-3) - 2px);
  background: var(--color-surface);
  color: var(--color-ink);
  border-left: 6px solid var(--color-accent);
  border-radius: var(--radius-sm);
}

.page-releases .rel-yield__key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.18em;
  color: var(--color-accent);
}

.page-releases .rel-yield__val {
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

/* ---------- 规则区 ---------- */

.page-releases .rel-rules {
  padding: var(--space-6) var(--rel-pad-x);
  background: var(--color-surface);
  color: var(--color-ink);
}

.page-releases .rel-rules__head {
  margin-bottom: var(--space-4);
}

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

.page-releases .rel-rules__lede {
  max-width: var(--measure);
  margin: var(--space-2) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-releases .rel-rules__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-releases .rel-rule {
  padding: var(--space-3) 0;
  border-top: 1px solid var(--color-line);
}

.page-releases .rel-rules__list .rel-rule:last-child {
  border-bottom: 1px solid var(--color-line);
}

.page-releases .rel-rule__id {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.14em;
  color: var(--color-primary);
}

.page-releases .rel-rule__title {
  margin: var(--space-1) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

.page-releases .rel-rule__text {
  max-width: 62ch;
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-releases .rel-rules__foot {
  max-width: var(--measure);
  margin: var(--space-4) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 桌面 ---------- */

@media (min-width: 720px) {
  .page-releases {
    --rel-pad-x: var(--space-4);
  }

  .page-releases .rel-stage__head {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: var(--space-3);
    align-items: start;
  }

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

  .page-releases .rel-hero__inner {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }

  .page-releases .rel-stage__split {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: var(--space-6);
    align-items: start;
  }

  .page-releases .rel-rules__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-6);
  }
}

@media (min-width: 900px) {
  .page-releases .rel-grid {
    grid-template-columns: var(--rel-rail-w) minmax(0, 1fr);
  }

  .page-releases .rel-rail {
    position: sticky;
    top: var(--space-4);
    align-self: start;
    padding: var(--space-6) var(--space-3) var(--space-6) 0;
  }

  .page-releases .rel-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-releases .rel-rail__item + .rel-rail__item {
    border-top: 1px solid var(--color-line);
  }

  .page-releases .rel-rail__item a {
    width: 100%;
    padding: var(--space-2) 0;
    border-bottom: 0;
    border-left: 3px solid transparent;
    padding-left: var(--space-2);
    white-space: normal;
  }

  .page-releases .rel-rail__item a:hover,
  .page-releases .rel-rail__item a:focus-visible {
    border-left-color: var(--color-accent);
    background: var(--color-surface-alt);
  }

  .page-releases .rel-stage__split {
    grid-template-columns: minmax(0, 1fr) 280px;
  }

  .page-releases .rel-hero__figures {
    gap: var(--space-6);
  }

  .page-releases .rel-rules__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-releases .rel-rule {
    padding: var(--space-4) 0;
  }
}
<<<END>>>