.page-releases {
  display: block;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-releases .breadcrumb {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-3) var(--gutter) 0;
}

/* ---------- 首屏 ---------- */
.page-releases .rel-hero {
  position: relative;
  margin-top: var(--space-2);
  padding: var(--space-6) 0 var(--space-6);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom-left-radius: var(--radius-lg);
  border-bottom-right-radius: var(--radius-lg);
  overflow: hidden;
}

.page-releases .rel-hero__inner {
  position: relative;
}

.page-releases .rel-hero__grid {
  display: grid;
  gap: var(--space-3);
}

.page-releases .rel-hero__figure {
  margin: 0;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-2);
  transform: rotate(-0.6deg);
}

.page-releases .rel-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-releases .rel-hero__text {
  position: relative;
  z-index: 2;
  padding: var(--space-2) 0 0;
}

.page-releases .rel-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.page-releases .rel-hero__dot {
  display: inline-block;
  width: var(--space-1);
  height: var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-contrast-accent);
}

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

.page-releases .rel-hero__lede {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-lg);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

.page-releases .rel-hero__stats {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.page-releases .rel-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-contrast-ink) 7%, transparent);
}

.page-releases .rel-stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-accent);
  font-variant-numeric: tabular-nums;
}

.page-releases .rel-stat__label {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

.page-releases .rel-hero__foot {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-contrast-accent);
}

.page-releases .rel-hero__foot-line {
  flex: 0 0 var(--space-6);
  height: var(--border-thick);
  background: var(--color-contrast-accent);
}

/* ---------- 目录与主轴布局 ---------- */
.page-releases .rel-layout {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

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

.page-releases .rel-toc {
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}

.page-releases .rel-toc .toc-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

.page-releases .rel-toc .toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.page-releases .rel-toc .toc-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
}

.page-releases .rel-toc .toc-link .toc-index {
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
}

.page-releases .rel-toc .toc-link.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-releases .rel-toc .toc-link.is-active .toc-index {
  color: var(--color-primary-ink);
}

.page-releases .rel-toc .toc-link:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: var(--space-1);
}

.page-releases .rel-toc__note {
  margin: var(--space-2) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ---------- 阶段区块 ---------- */
.page-releases .rel-stage {
  position: relative;
  margin-bottom: var(--space-4);
  padding: var(--space-4) var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
}

.page-releases .rel-stage--01 { background: var(--color-surface-alt); }
.page-releases .rel-stage--02 { background: var(--color-surface); }
.page-releases .rel-stage--03 { background: var(--color-surface-deep); }
.page-releases .rel-stage--04 {
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) 0;
}

.page-releases .rel-stage__head {
  display: grid;
  gap: var(--space-2);
  align-items: start;
  margin-bottom: var(--space-3);
}

.page-releases .rel-stage__no {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.9;
  color: var(--color-primary);
}

.page-releases .rel-stage__meta {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

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

.page-releases .rel-stage__lede {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-releases .rel-stage__tally {
  justify-self: start;
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  margin: 0;
  padding: var(--space-1) var(--space-2);
  border: var(--border-thick) solid var(--color-ink);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
}

.page-releases .rel-stage__tally-num {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.page-releases .rel-stage__tally-unit {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-releases .rel-stage__figure {
  margin: 0 0 var(--space-3);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-stage__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-releases .rel-stage__figure figcaption {
  padding: var(--space-1) var(--space-2);
  background: var(--color-surface);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ---------- 时间轴节点 ---------- */
.page-releases .rel-track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--space-3);
  position: relative;
}

.page-releases .rel-track::before {
  content: "";
  position: absolute;
  left: calc(var(--space-2) / 2 - var(--border-thin) / 2);
  top: var(--space-2);
  bottom: var(--space-2);
  width: var(--border-thin);
  background: var(--color-line);
}

.page-releases .rel-node {
  position: relative;
}

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

.page-releases .rel-node::before {
  content: "";
  position: absolute;
  left: calc(var(--space-3) * -1);
  top: var(--space-3);
  width: var(--space-2);
  height: var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  border: var(--border-thin) solid var(--color-surface);
}

.page-releases .rel-node__sum {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  list-style: none;
  cursor: pointer;
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  transition: box-shadow 160ms linear, transform 160ms linear;
}

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

.page-releases .rel-node__sum:hover {
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}

.page-releases .rel-node__sum:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: var(--space-1);
}

.page-releases .rel-node__box[open] > .rel-node__sum {
  border-color: var(--color-primary);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.page-releases .rel-node__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
}

.page-releases .rel-node__name {
  flex: 1 1 auto;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-releases .rel-node__pulse {
  flex: 0 0 auto;
  padding: 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.5;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-pill);
  font-variant-numeric: tabular-nums;
}

.page-releases .rel-node__body {
  padding: var(--space-2) var(--space-3) var(--space-3);
  background: color-mix(in srgb, var(--color-surface) 72%, transparent);
  border: var(--border-thin) solid var(--color-line);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.page-releases .rel-node__body p {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-base);
  color: var(--color-ink);
}

/* ---------- 字段列表 ---------- */
.page-releases .rel-fields {
  margin: 0;
  display: grid;
  gap: var(--space-1);
}

.page-releases .rel-field {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-1);
  padding: var(--space-1) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-field dt {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

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

/* ---------- 专栏与检索区块 ---------- */
.page-releases .rel-section {
  margin-top: var(--space-4);
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius-lg);
}

.page-releases .rel-section--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: 0 var(--radius-lg) var(--radius-lg) var(--radius-lg);
}

.page-releases .rel-section--deep {
  background: var(--color-surface-deep);
  color: var(--color-ink);
  border-radius: var(--radius-lg) 0 var(--radius-lg) var(--radius-lg);
}

.page-releases .rel-block__head {
  margin-bottom: var(--space-3);
}

.page-releases .rel-block__kicker {
  display: inline-block;
  margin: 0 0 var(--space-1);
  padding: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  border: var(--border-thin) solid var(--color-accent);
  border-radius: var(--radius-sm);
}

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

.page-releases .rel-block__lede {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-releases .rel-subhead {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  letter-spacing: 0.06em;
  color: var(--color-accent);
}

.page-releases .rel-column__grid {
  display: grid;
  gap: var(--space-4);
}

.page-releases .rel-section--dark .rel-block__kicker {
  color: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
}

.page-releases .rel-section--dark .rel-block__title {
  color: var(--color-contrast-ink);
}

.page-releases .rel-section--dark .rel-block__lede {
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.page-releases .rel-section--dark .rel-subhead {
  color: var(--color-contrast-accent);
}

.page-releases .rel-section--dark .rel-field {
  border-top-color: var(--color-contrast-line);
}

.page-releases .rel-section--dark .rel-field dt {
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.page-releases .rel-section--dark .rel-field dd {
  color: var(--color-contrast-ink);
}

.page-releases .rel-edges {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-releases .rel-edges li {
  display: grid;
  grid-template-columns: var(--space-2) minmax(0, 1fr);
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
}

.page-releases .rel-edges li::before {
  content: "";
  width: var(--space-2);
  height: var(--space-2);
  margin-top: var(--space-1);
  border-radius: var(--radius-sm);
  background: var(--color-contrast-accent);
}

/* ---------- 检索区 ---------- */
.page-releases .rel-cross {
  display: grid;
  gap: var(--space-4);
}

.page-releases .rel-cross__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-releases .rel-cross__list li {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--text-sm);
}

.page-releases .rel-cross__key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.page-releases .rel-cross__links p {
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
  color: var(--color-ink);
}

.page-releases .rel-cross__links a {
  color: var(--color-primary);
  font-weight: var(--weight-heading);
  text-decoration: underline;
  text-underline-offset: var(--space-1);
}

.page-releases .rel-cross__links a:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: var(--space-1);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-releases .rel-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-releases .rel-field {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 800px) {
  .page-releases .rel-stage {
    padding: var(--space-6) var(--space-4);
  }

  .page-releases .rel-column__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

  .page-releases .rel-cross {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-releases .rel-hero {
    padding: var(--space-8) 0 var(--space-6);
  }

  .page-releases .rel-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    align-items: end;
  }

  .page-releases .rel-hero__figure {
    grid-column: 1 / 8;
    grid-row: 1;
  }

  .page-releases .rel-hero__text {
    grid-column: 5 / 13;
    grid-row: 1;
    padding: var(--space-4) var(--space-3) var(--space-2);
    background: linear-gradient(
      100deg,
      color-mix(in srgb, var(--color-contrast-surface) 0%, transparent) 0%,
      color-mix(in srgb, var(--color-contrast-surface) 90%, transparent) 40%,
      var(--color-contrast-surface) 100%
    );
    border-radius: var(--radius-lg);
  }

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

  .page-releases .rel-stage__no {
    grid-row: 1 / 3;
  }

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

@media (min-width: 1024px) {
  .page-releases .rel-layout {
    display: grid;
    grid-template-columns: 14.5rem minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-releases .rel-aside {
    position: sticky;
    top: var(--space-8);
    margin-bottom: 0;
  }

  .page-releases .rel-toc .toc-list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: var(--space-1);
  }

  .page-releases .rel-toc .toc-link {
    width: 100%;
  }
}

@media (min-width: 1220px) {
  .page-releases .rel-stage--02 {
    transform: translateX(var(--space-2));
  }

  .page-releases .rel-stage--03 {
    transform: translateX(calc(var(--space-2) * -0.75));
  }

  .page-releases .rel-stage--04 {
    transform: translateX(var(--space-1));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-releases .rel-node__sum {
    transition: none;
  }

  .page-releases .rel-node__sum:hover {
    transform: none;
  }

  .page-releases .rel-stage {
    transform: none;
  }
}