.page-releases .rel-hero {
  padding-top: var(--space-3);
  padding-bottom: var(--space-8);
}

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

.page-releases .rel-hero .crumb-list,
.page-releases .rel-hero .crumb-list a {
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

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

.page-releases .rel-hero-inner {
  display: block;
}

.page-releases .rel-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-contrast-accent);
  margin: 0 0 var(--space-2);
}

.page-releases .rel-hero-title {
  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);
  max-width: 20ch;
  margin: 0 0 var(--space-3);
}

.page-releases .rel-hero-lede {
  max-width: 62ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
  margin: 0;
}

.page-releases .rel-stats {
  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-contrast-line);
  list-style: none;
}

.page-releases .rel-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-ink);
  font-variant-numeric: tabular-nums;
}

.page-releases .rel-stat-label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

@media (min-width: 760px) {
  .page-releases .rel-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 分段切换 ---------- */

.page-releases .rel-switch-section {
  padding-top: var(--space-6);
}

.page-releases .rel-tabbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding: var(--space-1);
  background: var(--color-surface-deep);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-6);
  width: max-content;
  max-width: 100%;
}

.page-releases .rel-tabbar .tab {
  border: 0;
  background: transparent;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink-soft);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 200ms cubic-bezier(0.2, 0.7, 0.2, 1), color 200ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.page-releases .rel-tabbar .tab[aria-selected="true"] {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-1);
}

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

.page-releases .rel-panel[hidden] {
  display: none;
}

.page-releases .rel-panel:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 4px;
}

.page-releases .rel-stack {
  display: grid;
  gap: var(--space-8);
}

/* ---------- 时间线 ---------- */

.page-releases .rel-timeline {
  display: grid;
  gap: var(--space-6);
}

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

.page-releases .rel-timeline-aside img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 640 / 900;
}

@media (min-width: 1020px) {
  .page-releases .rel-timeline {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: var(--space-6);
    align-items: start;
  }

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

.page-releases .rel-stages {
  display: grid;
  gap: var(--space-2);
}

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

.page-releases .rel-stage:last-child {
  border-bottom: var(--border-thin) solid var(--color-line);
  padding-bottom: var(--space-3);
}

.page-releases .rel-stage > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-1) var(--space-3);
  align-items: baseline;
  padding: var(--space-2) 0;
}

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

.page-releases .rel-stage > summary::after {
  content: "展开";
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-releases .rel-stage[open] > summary::after {
  content: "收起";
  color: var(--color-primary);
}

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

.page-releases .rel-stage-index {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-releases .rel-stage-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  line-height: var(--leading-heading);
}

.page-releases .rel-stage-meta {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-releases .rel-entries {
  list-style: none;
  margin: 0 0 var(--space-3);
  padding: 0 0 0 var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  display: grid;
}

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

.page-releases .rel-item:last-child {
  border-bottom: 0;
}

.page-releases .rel-item-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  padding-top: 3px;
  font-variant-numeric: tabular-nums;
}

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

.page-releases .rel-item-text {
  font-size: var(--text-base);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
  max-width: 62ch;
  margin: 0 0 var(--space-2);
}

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

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

/* ---------- 当前版本 ---------- */

.page-releases .rel-current {
  display: grid;
  gap: var(--space-4);
  background: var(--color-primary-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  border-left: 3px solid var(--color-primary);
}

.page-releases .rel-current .eyebrow {
  margin-bottom: var(--space-2);
}

.page-releases .rel-current-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);
  margin: 0 0 var(--space-2);
}

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

.page-releases .rel-current-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

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

@media (min-width: 860px) {
  .page-releases .rel-current {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: center;
    padding: var(--space-6);
  }

  .page-releases .rel-current-actions {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
  }
}

/* ---------- 内容块通用 ---------- */

.page-releases .rel-block .rel-section-head {
  margin-bottom: var(--space-6);
}

.page-releases .rel-block-title {
  font-size: var(--text-2xl);
  max-width: 30ch;
}

.page-releases .rel-block--narrow {
  max-width: 76ch;
}

/* ---------- 五栏帮助 ---------- */

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

.page-releases .rel-help-col {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  display: grid;
  align-content: start;
  gap: var(--space-1);
  transition: border-color 200ms cubic-bezier(0.2, 0.7, 0.2, 1), transform 200ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.page-releases .rel-help-col:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.page-releases .rel-help-num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}

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

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

/* ---------- 三步 ---------- */

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

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

.page-releases .rel-step {
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  display: grid;
  gap: var(--space-1);
}

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

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

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

.page-releases .rel-step-done {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  padding-top: var(--space-1);
  border-top: var(--border-thin) solid var(--color-line);
}

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

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

.page-releases .rel-steps-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 720 / 480;
}

@media (min-width: 900px) {
  .page-releases .rel-steps-wrap {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-6);
    align-items: start;
  }

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

/* ---------- 资料清单 ---------- */

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

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

.page-releases .rel-doc {
  position: relative;
  padding-top: var(--space-4);
}

.page-releases .rel-doc-tag {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
}

.page-releases .rel-doc-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}

.page-releases .rel-doc-spec {
  margin: 0;
  display: grid;
  gap: var(--space-2);
}

.page-releases .rel-doc-spec > div {
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(0, 1fr);
  gap: var(--space-2);
  align-items: baseline;
  padding-top: var(--space-1);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .rel-doc-spec dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin: 0;
}

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

.page-releases .rel-doc-spec dd.num {
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-weight: var(--weight-heading);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-lg);
}

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

.page-releases .rel-docs-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 640 / 400;
}

@media (min-width: 900px) {
  .page-releases .rel-docs-wrap {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: var(--space-6);
    align-items: start;
  }

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

/* ---------- 响应节奏 ---------- */

.page-releases .rel-pace {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

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

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

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

.page-releases .rel-pace-val {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
  max-width: 68ch;
}

/* ---------- 延伸阅读 ---------- */

.page-releases .rel-more-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  line-height: var(--leading-heading);
  margin: 0 0 var(--space-4);
}

.page-releases .rel-more-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-releases .rel-more-item {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

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

.page-releases .rel-more-item a {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-primary);
  text-decoration: none;
  width: max-content;
  max-width: 100%;
  border-bottom: var(--border-thin) solid transparent;
  transition: border-color 120ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

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

.page-releases .rel-more-item span {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

@media (min-width: 780px) {
  .page-releases .rel-more-item {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: var(--space-3);
    align-items: baseline;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-releases .rel-help-col,
  .page-releases .rel-more-item a,
  .page-releases .rel-tabbar .tab {
    transition: none;
  }

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