.page-releases .section-eyebrow {
  color: var(--color-primary);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  margin: 0;
}

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

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

.page-releases .section-note {
  color: var(--color-ink-soft);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  margin: var(--space-3) 0 0;
}

/* 首屏 */
.page-releases .rel-hero {
  padding-bottom: 0;
}

.page-releases .rel-hero-head {
  margin-top: var(--space-6);
}

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

.page-releases .rel-hero-lede {
  color: var(--color-ink-soft);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  max-width: var(--measure);
  margin: var(--space-3) 0 0;
}

.page-releases .rel-hero-figure {
  margin: var(--space-6) 0 0;
}

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

.page-releases .rel-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
  margin: var(--space-6) 0 0;
  padding: var(--space-4) 0 0;
  border-top: var(--border-thin) solid var(--color-line);
}

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

.page-releases .rel-stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  line-height: 1;
  color: var(--color-accent);
}

.page-releases .rel-stat-label {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin-top: var(--space-1);
}

/* 标签带 */
.page-releases .rel-tag-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.page-releases .rel-tag-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-tag {
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
  min-width: 0;
}

.page-releases .rel-tag-count {
  display: inline-block;
  margin-left: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-releases .rel-tag-note {
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  margin: var(--space-1) 0 0;
}

.page-releases .rel-tag-figure {
  margin: 0;
}

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

.page-releases .media-caption {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  line-height: var(--leading-body);
  margin-top: var(--space-2);
}

/* 筛选条 */
.page-releases .rel-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding: var(--space-3) 0;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-filter-label {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.1em;
  margin-right: var(--space-1);
}

.page-releases .rel-filter-input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.page-releases .filter-chip {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.6;
  cursor: pointer;
  transition: color 200ms ease-out, background-color 200ms ease-out, border-color 200ms ease-out;
}

.page-releases .filter-chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.page-releases .rel-filter-input:checked + .filter-chip {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

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

.page-releases .rel-filter-status {
  flex-basis: 100%;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin: var(--space-1) 0 0;
}

/* 条目流 */
.page-releases .rel-flow {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
}

.page-releases .rel-year {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-6) 0 var(--space-2);
  margin-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
  scroll-margin-top: 96px;
}

.page-releases .rel-year-label {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  color: var(--color-ink);
  letter-spacing: var(--tracking-heading);
}

.page-releases .rel-year-count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-releases .rel-break {
  list-style: none;
  height: 0;
  margin: var(--space-4) 0 var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .rail-item {
  position: relative;
  padding-left: var(--space-6);
  padding-bottom: var(--space-6);
}

.page-releases .rail-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  background: var(--color-ink-muted);
  transition: background-color 200ms ease-out;
}

.page-releases .rail-item::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 1.1em;
  bottom: 0;
  width: 1px;
  background: var(--color-line);
}

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

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

.page-releases .rel-entry-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.page-releases .rel-no {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.06em;
}

.page-releases .rel-state {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-releases .rel-state::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-ink-muted);
}

.page-releases .rel-state--live {
  color: var(--color-accent);
}

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

.page-releases .rail-title {
  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);
  margin: var(--space-2) 0 0;
}

.page-releases .rail-note {
  color: var(--color-ink-soft);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  max-width: var(--measure);
  margin: var(--space-2) 0 0;
  transition: color 200ms ease-out;
}

.page-releases .rail-item:hover .rail-note {
  color: var(--color-ink);
}

.page-releases .rel-scope {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: var(--leading-body);
  margin: var(--space-1) 0 0;
}

.page-releases .expand {
  margin-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-2);
}

.page-releases .expand > summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  transition: color 200ms ease-out;
}

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

.page-releases .expand > summary::before {
  content: "▸";
  color: var(--color-primary);
}

.page-releases .expand[open] > summary::before {
  content: "▾";
}

.page-releases .expand[open] > summary {
  color: var(--color-ink);
}

.page-releases .expand > summary:hover {
  color: var(--color-primary);
}

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

.page-releases .expand-body {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
  max-width: var(--measure);
  margin-top: var(--space-2);
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
}

/* 标签筛选：纯 CSS 状态 */
.page-releases:has(#relf-version:checked) .rel-flow .rail-item:not([data-tags~="版本发布"]),
.page-releases:has(#relf-adjust:checked) .rel-flow .rail-item:not([data-tags~="功能调整"]),
.page-releases:has(#relf-add:checked) .rel-flow .rail-item:not([data-tags~="内容增补"]),
.page-releases:has(#relf-fix:checked) .rel-flow .rail-item:not([data-tags~="问题修复"]),
.page-releases:has(#relf-adapt:checked) .rel-flow .rail-item:not([data-tags~="适配同步"]),
.page-releases:has(#relf-doc:checked) .rel-flow .rail-item:not([data-tags~="文档校订"]),
.page-releases:has(#relf-index:checked) .rel-flow .rail-item:not([data-tags~="索引重建"]) {
  display: none;
}

/* 更新节奏 */
.page-releases .rel-pace-figure {
  margin: var(--space-6) 0 0;
}

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

.page-releases .rel-pace-band {
  margin-top: var(--space-6);
  padding: var(--space-6) var(--space-4);
}

.page-releases .rel-pace-band-title {
  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);
  color: var(--color-contrast-ink);
  margin: 0;
}

.page-releases .rel-pace-list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
}

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

.page-releases .rel-pace-no {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-contrast-accent);
  letter-spacing: 0.08em;
}

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

.page-releases .rel-pace-foot {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: var(--leading-body);
  margin: var(--space-4) 0 0;
}

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

.page-releases .rel-pace-foot a:hover {
  border-bottom-color: var(--color-primary);
}

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

/* 回溯与跟踪 */
.page-releases .rel-ledger-wrap {
  margin-top: var(--space-6);
  overflow-x: auto;
}

.page-releases .rel-ledger {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}

.page-releases .rel-ledger caption {
  text-align: left;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  padding-bottom: var(--space-2);
}

.page-releases .rel-ledger th,
.page-releases .rel-ledger td {
  text-align: left;
  padding: var(--space-3) var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-releases .rel-ledger thead th {
  background: var(--color-surface-deep);
  color: var(--color-ink);
  font-weight: var(--weight-body);
  border-bottom-color: var(--color-line);
}

.page-releases .rel-ledger .col-no {
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

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

.page-releases .rel-ledger a:hover {
  border-bottom-color: var(--color-primary);
}

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

.page-releases .rel-next {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-next-item {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-next-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding: var(--space-4) 0;
  text-decoration: none;
  color: inherit;
  transition: background-color 200ms ease-out;
}

.page-releases .rel-next-link:hover {
  background: var(--color-surface-alt);
}

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

.page-releases .rel-next-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.1em;
}

.page-releases .rel-next-title {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-ink);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.page-releases .rel-next-note {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  line-height: var(--leading-body);
  margin-top: var(--space-1);
}

/* 桌面布局 */
@media (min-width: 768px) {
  .page-releases .rel-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-releases .rel-tag-band {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-releases .rel-tag-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-releases .rel-tag {
    padding-right: var(--space-3);
  }

  .page-releases .rel-next-link {
    grid-template-columns: minmax(0, 1fr) minmax(0, 4fr);
    gap: var(--space-3);
    align-items: start;
  }

  .page-releases .rel-next-label {
    padding-top: 0.35em;
  }

  .page-releases .rel-pace-band {
    padding: var(--space-8) var(--space-6);
  }
}