.page-releases {
  --pr-node-rail: 148px;
  --pr-line-inset: var(--space-3);
  display: block;
}

/* ============ 首屏 ============ */
.page-releases__hero {
  padding-block: var(--space-4) var(--section-y);
}

.page-releases__hero-top {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-6);
  margin-bottom: var(--space-6);
}

.page-releases__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.95;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  overflow-wrap: break-word;
}

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

.page-releases__hero-grid {
  display: grid;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.page-releases__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  position: relative;
  z-index: 1;
}

.page-releases__stat {
  padding: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  border-right: var(--border-thin) solid var(--color-contrast-line);
}

.page-releases__stat:nth-child(2n) {
  border-right: 0;
}

.page-releases__stat:nth-child(n + 3) {
  border-bottom: 0;
}

.page-releases__stat-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--color-contrast-accent);
}

.page-releases__stat-label {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

.page-releases__hero-figure {
  margin: 0;
  position: relative;
  z-index: 2;
}

.page-releases__hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--border-thin) solid var(--color-contrast-line);
  background: var(--color-contrast-surface);
}

/* 四条线索引 */
.page-releases__line-nav {
  display: grid;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases__line-link {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  text-decoration: none;
  color: var(--color-ink);
  transition: background-color 140ms linear;
}

.page-releases__line-link:last-child {
  border-bottom: 0;
}

.page-releases__line-link:hover,
.page-releases__line-link:focus-visible {
  background: var(--color-primary-soft);
}

.page-releases__line-no {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}

.page-releases__line-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

.page-releases__line-range {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink-muted);
}

/* ============ 更新线区块 ============ */
.page-releases__line {
  position: relative;
}

.page-releases__line--alt {
  background: var(--color-surface-alt);
}

.page-releases__line-head {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases__line-intro {
  display: grid;
  gap: var(--space-2);
}

.page-releases__line-intro p {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink);
}

.page-releases__line-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

/* 线索配图 */
.page-releases__shot {
  margin: 0 0 var(--space-6) auto;
  width: min(100%, 560px);
  position: relative;
  z-index: 2;
}

.page-releases__shot img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-contrast-surface);
}

.page-releases__pulse {
  margin: 0 0 var(--space-6) auto;
  width: min(100%, 340px);
  position: relative;
  z-index: 2;
}

.page-releases__pulse img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--border-thin) solid var(--color-line);
}

/* 版本节点流 */
.page-releases__nodes {
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--pr-line-inset);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-releases__node {
  display: grid;
  gap: var(--space-2);
  padding-block: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases__node:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-releases__node-rail {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.page-releases__ver {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--color-accent);
}

.page-releases__node-body {
  display: grid;
  gap: var(--space-1);
}

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

.page-releases__node-read {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink);
}

.page-releases__node-impact {
  margin: var(--space-1) 0 0;
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-primary);
  color: var(--color-ink-soft);
}

.page-releases__node:first-child .page-releases__node-title {
  font-size: var(--text-xl);
}

/* ============ 更新方式 ============ */
.page-releases__delivery .container {
  max-width: var(--container);
}

.page-releases__delivery-panel {
  padding: var(--space-6) var(--space-4);
}

.page-releases__delivery-kicker {
  margin: 0 0 var(--space-2);
  color: var(--color-contrast-accent);
  display: block;
}

.page-releases__delivery-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.page-releases__delivery-lede {
  margin: 0 0 var(--space-6);
  max-width: var(--measure);
  color: var(--color-contrast-ink);
  opacity: 0.86;
}

.page-releases__specs {
  display: grid;
  gap: 0;
  margin: 0 0 var(--space-6);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-releases__spec {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-releases__spec dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-contrast-accent);
}

.page-releases__spec dd {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-contrast-ink);
}

.page-releases__delivery-note {
  margin: 0;
  max-width: var(--measure);
  padding-left: var(--space-3);
  border-left: 3px solid var(--color-contrast-accent);
  color: var(--color-contrast-ink);
  opacity: 0.9;
}

/* ============ 下一步 ============ */
.page-releases__next-grid {
  display: grid;
  gap: var(--space-6);
}

.page-releases__next-lead {
  display: grid;
  gap: var(--space-2);
  align-content: start;
}

.page-releases__next-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-releases__next-lead p {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-releases__next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases__next-list li {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases__next-no {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  color: var(--color-primary-ink);
  background: var(--color-primary);
  width: 2em;
  text-align: center;
  padding: 2px 0;
  line-height: 1.4;
}

.page-releases__next-list p {
  margin: 0;
  color: var(--color-ink);
}

.page-releases__next-list a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-releases__next-list a:hover,
.page-releases__next-list a:focus-visible {
  color: var(--color-focus);
}

.page-releases__next-foot {
  margin: var(--space-6) 0 0;
  color: var(--color-ink-muted);
}

.page-releases__next-foot a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-releases__hero {
    padding-block: var(--space-6) var(--section-y);
  }

  .page-releases__line-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-releases__line-link {
    border-bottom: var(--border-thin) solid var(--color-line);
    border-right: var(--border-thin) solid var(--color-line);
  }

  .page-releases__line-link:nth-child(2n) {
    border-right: 0;
  }

  .page-releases__line-link:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .page-releases__node:nth-child(even) {
    padding-left: var(--space-4);
  }

  .page-releases__spec {
    grid-template-columns: minmax(140px, 3fr) minmax(0, 8fr);
    align-items: baseline;
    gap: var(--space-3);
  }

  .page-releases__next-list li {
    grid-template-columns: auto minmax(0, 1fr);
    gap: var(--space-3);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-releases__hero-top {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: end;
    gap: var(--space-6);
  }

  .page-releases__hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: var(--space-3);
  }

  .page-releases__hero-figure {
    margin-left: calc(var(--space-6) * -1);
  }

  .page-releases__line-nav {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-releases__line-link {
    border-right: var(--border-thin) solid var(--color-line);
    border-bottom: 0;
  }

  .page-releases__line-link:nth-child(2n) {
    border-right: var(--border-thin) solid var(--color-line);
  }

  .page-releases__line-link:last-child {
    border-right: 0;
  }

  .page-releases__line-head {
    grid-template-columns: auto minmax(0, 1fr);
    gap: var(--space-4);
    align-items: start;
  }

  .page-releases__shot {
    margin-top: calc(var(--space-6) * -1);
    margin-bottom: var(--space-6);
  }

  .page-releases__pulse {
    margin-top: calc(var(--space-6) * -1);
    margin-bottom: var(--space-4);
  }

  .page-releases__node {
    grid-template-columns: var(--pr-node-rail) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: start;
    padding-block: var(--space-6);
  }

  .page-releases__node:first-child {
    padding-top: 0;
  }

  .page-releases__node-rail {
    display: grid;
    justify-items: start;
    gap: var(--space-2);
    position: sticky;
    top: var(--space-6);
  }

  .page-releases__delivery-panel {
    padding: var(--space-8) var(--space-6);
  }

  .page-releases__next-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: var(--space-8);
    align-items: start;
  }
}

@media (min-width: 1120px) {
  .page-releases__hero-grid {
    gap: var(--space-3);
  }

  .page-releases__stat {
    padding: var(--space-4) var(--space-3);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-releases__line-link {
    transition: none;
  }
}