.page-releases {
  --rel-rail-w: 236px;
  --rel-flow-gap: var(--space-4);
}

/* ===== 首屏 ===== */
.page-releases .rel-hero {
  background: var(--color-surface);
  padding-top: var(--space-3);
}

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

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

.page-releases .rel-hero__lede {
  font-size: var(--text-lg);
  line-height: 1.45;
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

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

/* 暗色斜切数字条带 */
.page-releases .rel-band {
  margin-top: var(--space-6);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: calc(var(--space-8) + var(--space-2)) 0 var(--space-6);
  clip-path: polygon(0 24px, 100% 0, 100% 100%, 0 100%);
}

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

.page-releases .rel-band__label {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  font-size: var(--text-lg);
  margin: 0 0 var(--space-1);
  color: var(--color-contrast-ink);
}

.page-releases .rel-band__note {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.72;
}

.page-releases .rel-band__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.page-releases .rel-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-top: var(--space-2);
}

.page-releases .rel-stat__num {
  font-size: var(--text-2xl);
  line-height: 1;
  color: var(--color-contrast-accent);
  letter-spacing: -0.02em;
  text-shadow: 0 0 var(--space-1) color-mix(in srgb, var(--color-contrast-accent) 45%, transparent);
}

.page-releases .rel-stat--lead .rel-stat__num {
  font-size: var(--text-figure);
}

.page-releases .rel-stat__label {
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

/* ===== 分类线说明 ===== */
.page-releases .rel-intro__inner {
  display: grid;
  gap: var(--space-4);
}

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

.page-releases .rel-intro__fig {
  margin: 0;
}

/* ===== 条目流 ===== */
.page-releases .rel-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--rel-flow-gap);
}

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

.page-releases .rel-rail__title {
  font-size: var(--text-sm);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-2);
}

.page-releases .rel-rail__chips {
  display: flex;
  flex-wrap: nowrap;
  gap: var(--space-1);
  overflow-x: auto;
  padding-bottom: var(--space-1);
  scrollbar-width: thin;
}

.page-releases .rel-rail__chips .chip {
  flex: 0 0 auto;
  min-height: 44px;
}

.page-releases .rel-rail__chips .chip[aria-pressed="true"] {
  background: var(--color-highlight);
  border-color: var(--color-accent);
  color: var(--color-ink);
}

.page-releases .chip__n {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  margin-left: var(--space-1);
  color: var(--color-ink-muted);
}

.page-releases .rel-rail__count {
  margin: var(--space-2) 0 var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink);
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-2);
}

.page-releases .rel-rail__count .mono {
  font-size: var(--text-lg);
  color: var(--color-primary);
}

.page-releases .rel-rail__hint {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

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

.page-releases .rel-item {
  border-left: var(--border-thick) solid var(--color-line);
  padding: 0 0 var(--space-4) var(--space-3);
  transition: border-color 150ms linear;
}

.page-releases .rel-item + .rel-item {
  margin-top: var(--space-4);
}

.page-releases .rel-item:hover,
.page-releases .rel-item:focus-within {
  border-left-color: var(--color-primary);
}

.page-releases .rel-item__head {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-item__head::after {
  content: "";
  position: absolute;
  left: var(--space-3);
  bottom: calc(-1 * var(--border-thin));
  width: 44px;
  height: var(--border-thin);
  background: var(--color-primary);
}

.page-releases .rel-ver {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
}

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

.page-releases .rel-kind--channel {
  background: var(--color-highlight);
  color: var(--color-accent);
}

.page-releases .rel-kind--panel {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.page-releases .rel-kind--mobile {
  background: var(--color-surface-deep);
  color: var(--color-ink);
}

.page-releases .rel-kind--metric {
  background: transparent;
  border: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
}

.page-releases .rel-state {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-sm);
  padding: 2px var(--space-1);
  border-radius: var(--radius-sm);
  cursor: help;
}

.page-releases .rel-state::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.page-releases .rel-state--live {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.page-releases .rel-state--stable {
  background: var(--color-highlight);
  color: var(--color-accent);
}

.page-releases .rel-state--watch {
  background: var(--color-surface-deep);
  color: var(--color-ink-muted);
  border: var(--border-thin) dashed var(--color-line);
}

.page-releases .rel-item__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: var(--space-2) 0 var(--space-1);
}

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

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

.page-releases .rel-item__scope-key {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  border-left: var(--border-thin) solid var(--color-accent);
  padding-left: var(--space-1);
  margin-right: var(--space-1);
}

.page-releases .rel-more {
  margin-top: var(--space-2);
  max-width: var(--measure);
}

.page-releases .rel-more summary {
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  cursor: pointer;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.page-releases .rel-inline-fig {
  margin: var(--space-6) 0;
  max-width: 520px;
}

.page-releases .rel-inline-fig--tall {
  max-width: 320px;
}

/* ===== 兼容与回退 ===== */
.page-releases .rel-fallback__inner {
  display: grid;
  gap: var(--space-6);
}

.page-releases .rel-steps {
  margin: 0;
}

.page-releases .rel-steps .step {
  border-left-color: var(--color-contrast-line);
}

.page-releases .rel-steps .step:hover {
  border-left-color: var(--color-contrast-accent);
}

.page-releases .rel-steps .step__idx {
  color: var(--color-contrast-accent);
}

.page-releases .rel-step__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  font-size: var(--text-lg);
  color: var(--color-contrast-ink);
  margin: 0 0 var(--space-1);
}

.page-releases .rel-step__text {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.82;
  margin: 0;
  max-width: var(--measure);
}

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

.page-releases .rel-fallback__side {
  display: grid;
  gap: var(--space-3);
  align-content: start;
}

.page-releases .rel-side-block {
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.page-releases .rel-side-block--solid {
  background: color-mix(in srgb, var(--color-contrast-accent) 14%, var(--color-contrast-surface));
  border-color: var(--color-contrast-accent);
}

.page-releases .rel-side-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  font-size: var(--text-base);
  color: var(--color-contrast-ink);
  margin: 0 0 var(--space-2);
}

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

.page-releases .rel-side-list li {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.86;
  padding: var(--space-1) 0;
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-releases .rel-side-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

/* ===== 归档与节奏 ===== */
.page-releases .rel-archive__inner {
  display: grid;
  gap: var(--space-4);
}

.page-releases .rel-archive__legend {
  align-self: start;
}

.page-releases .rel-legend__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  font-size: var(--text-base);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

.page-releases .rel-legend {
  margin: 0;
}

.page-releases .rel-legend__row {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-legend__row:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-releases .rel-legend__row dt {
  margin: 0;
}

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

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

.page-releases .rel-rule {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  align-items: start;
  padding: var(--space-3) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

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

.page-releases .rel-rule__idx {
  font-size: var(--text-sm);
  color: var(--color-primary);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  padding: 2px var(--space-1);
}

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

/* ===== 结尾引导 ===== */
.page-releases .rel-next__inner {
  display: grid;
  gap: var(--space-3);
  align-items: center;
}

.page-releases .rel-next__text {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  font-size: var(--text-lg);
  color: var(--color-ink);
}

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

/* ===== 响应式 ===== */
@media (min-width: 700px) {
  .page-releases .rel-band__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-releases .rel-rule {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: var(--space-3);
  }
}

@media (min-width: 900px) {
  .page-releases .rel-band__inner {
    grid-template-columns: minmax(0, 280px) minmax(0, 1fr);
    gap: var(--space-6);
    align-items: end;
  }

  .page-releases .rel-intro__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    gap: var(--space-6);
    align-items: center;
  }

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

  .page-releases .rel-rail {
    position: sticky;
    top: 96px;
  }

  .page-releases .rel-rail__chips {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .page-releases .rel-rail__chips .chip {
    flex: 0 1 auto;
  }

  .page-releases .rel-fallback__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: var(--space-6);
  }

  .page-releases .rel-inline-fig {
    margin-left: var(--space-3);
  }

  .page-releases .rel-inline-fig--tall {
    margin-left: var(--space-3);
  }
}

@media (min-width: 1100px) {
  .page-releases {
    --rel-rail-w: 260px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-releases .rel-item,
  .page-releases .rel-steps .step {
    transition: none;
  }
}