.page-releases {
  --rail-offset: var(--space-8);
  --dot-size: calc(var(--space-1) + 1px);
  display: block;
}

.page-releases a:focus-visible {
  outline: calc(var(--border-thin) * 2) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 首屏 ---------- */
.page-releases .release-hero {
  padding-top: var(--space-4);
  padding-bottom: var(--space-8);
}

.page-releases .release-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "lede"
    "figures"
    "rail"
    "media";
  gap: var(--space-6);
  align-items: start;
}

.page-releases .release-hero__lede {
  grid-area: lede;
}

.page-releases .release-hero__title {
  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-ink);
  margin: var(--space-3) 0 0;
  max-width: 18ch;
}

.page-releases .release-hero__text {
  margin-top: var(--space-4);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

/* 阶段跳转刻度 */
.page-releases .release-hero__rail {
  grid-area: rail;
  position: relative;
}

.page-releases .release-hero__rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-releases .release-hero__rail-list a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: border-color 120ms ease, background-color 120ms ease, color 120ms ease;
}

.page-releases .release-hero__rail-list a:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-ink);
}

.page-releases .release-hero__rail-dot {
  width: var(--dot-size);
  height: var(--dot-size);
  flex: none;
  background: var(--color-primary);
}

.page-releases .release-hero__rail .is-current .release-hero__rail-dot {
  background: var(--color-accent);
}

.page-releases .release-hero__rail .is-current a {
  border-color: var(--color-highlight);
  background: var(--color-highlight);
  color: var(--color-ink);
}

/* 关键数字 */
.page-releases .release-hero__figures {
  grid-area: figures;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--border-thin);
  background: var(--color-line);
  border: var(--border-thin) solid var(--color-line);
}

.page-releases .release-figure {
  background: var(--color-surface);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-releases .release-figure__key {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  letter-spacing: 0.04em;
  margin: 0;
}

.page-releases .release-figure__val {
  margin: 0;
  font-size: var(--text-figure);
  line-height: 1;
  color: var(--color-ink);
  transition: color 120ms ease;
}

.page-releases .release-figure--dark {
  grid-column: 1 / -1;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-releases .release-figure--dark .release-figure__key {
  color: var(--color-contrast-ink);
  opacity: 0.75;
}

.page-releases .release-figure--dark .release-figure__val {
  color: var(--color-contrast-ink);
}

.page-releases .release-figure--dark:hover .release-figure__val {
  color: var(--color-contrast-accent);
}

.page-releases .release-figure--dark .placard {
  color: var(--color-contrast-ink);
  opacity: 0.7;
}

.page-releases .release-figure__note {
  margin: 0;
  font-size: var(--text-sm);
}

/* 首屏图片 */
.page-releases .release-hero__media {
  grid-area: media;
  position: relative;
  margin: 0;
  overflow: hidden;
}

.page-releases .release-hero__media .media-frame__media,
.page-releases .release-media .media-frame__media {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-releases .release-hero__media .media-frame__scrim,
.page-releases .release-media .media-frame__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.page-releases .release-hero__media .media-frame__body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-4);
  color: var(--color-contrast-ink);
}

.page-releases .release-hero__media .media-frame__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  margin: 0 0 var(--space-2);
}

.page-releases .release-hero__media .placard {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.82;
}

/* ---------- 时间线 ---------- */
.page-releases .release-timeline__head {
  max-width: var(--measure);
}

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

.page-releases .release-timeline__head .prose {
  margin-top: var(--space-3);
  color: var(--color-ink-soft);
}

.page-releases .release-stages {
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: 0;
}

.page-releases .release-stage {
  position: relative;
  scroll-margin-top: var(--space-8);
}

.page-releases .release-stage + .release-stage {
  margin-top: var(--space-8);
}

.page-releases .release-stage__head {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-4);
  max-width: 100%;
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.page-releases .release-stage__no {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.page-releases .release-stage__name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  margin: var(--space-2) 0 0;
}

.page-releases .release-stage__count {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

.page-releases .release-stage__note {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  max-width: 46ch;
}

.page-releases .release-stage__intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
}

.page-releases .release-media {
  position: relative;
  margin: 0;
  overflow: hidden;
}

.page-releases .release-media .media-frame__body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
}

.page-releases .release-media .placard {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  opacity: 0.82;
}

.page-releases .release-media--wide {
  margin-top: var(--space-3);
}

/* 节点 */
.page-releases .release-nodes {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

.page-releases .release-node {
  border-left: var(--border-thin) solid var(--color-line);
  padding: var(--space-3);
  transition: border-color 120ms ease, background-color 120ms ease;
}

.page-releases .release-node:hover,
.page-releases .release-node:focus-within {
  border-left-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.page-releases .release-node__ver {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  transition: color 120ms ease;
}

.page-releases .release-node:hover .release-node__ver,
.page-releases .release-node:focus-within .release-node__ver {
  color: var(--color-accent);
}

.page-releases .release-node__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

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

.page-releases .release-node__result {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin: var(--space-3) 0 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .release-node__fig {
  font-size: var(--text-xl);
  line-height: 1;
  color: var(--color-ink);
}

.page-releases .release-node__unit {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* ---------- 当前版本入口 ---------- */
.page-releases .release-current__panel {
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
  padding: var(--space-6) var(--space-4);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-releases .release-current__title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-3) 0 0;
  max-width: 20ch;
}

.page-releases .release-current__lede .prose {
  margin-top: var(--space-3);
  color: var(--color-ink-soft);
}

.page-releases .release-current__links {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .release-current__links li {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .release-current__links a {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-2);
  text-decoration: none;
  color: var(--color-ink);
  transition: background-color 120ms ease;
}

.page-releases .release-current__links a:hover {
  background: var(--color-highlight);
}

.page-releases .release-current__no {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  flex: none;
}

.page-releases .release-current__label {
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

/* ---------- 桌面：非对称栅格与纵向刻度 ---------- */
@media (min-width: 900px) {
  .page-releases .release-hero__grid {
    grid-template-columns: var(--rail-offset) minmax(0, 1fr) 320px;
    grid-template-areas:
      "rail lede figures"
      "rail media media";
    column-gap: var(--space-6);
    row-gap: var(--space-8);
  }

  .page-releases .release-hero__rail {
    min-height: 480px;
  }

  .page-releases .release-hero__rail::before {
    content: "";
    position: absolute;
    left: calc(var(--space-1) / 2);
    top: 0;
    bottom: 0;
    width: var(--border-thin);
    background: var(--color-line);
  }

  .page-releases .release-hero__rail-list {
    flex-direction: column;
    justify-content: space-between;
    flex-wrap: nowrap;
    height: 100%;
    gap: var(--space-2);
  }

  .page-releases .release-hero__rail-list a {
    border: 0;
    background: transparent;
    padding: 0;
    gap: var(--space-3);
  }

  .page-releases .release-hero__rail-list a:hover {
    background: transparent;
  }

  .page-releases .release-hero__rail-dot {
    position: relative;
    z-index: 1;
  }

  .page-releases .release-hero__rail-label {
    writing-mode: vertical-rl;
    font-size: var(--text-sm);
    letter-spacing: 0.12em;
    color: var(--color-ink-muted);
  }

  .page-releases .release-hero__figures {
    grid-template-columns: minmax(0, 1fr);
    align-self: start;
  }

  .page-releases .release-hero__figures .release-figure--dark {
    grid-column: auto;
  }

  /* 时间线纵向主刻度 */
  .page-releases .release-stages {
    position: relative;
    padding-left: var(--rail-offset);
  }

  .page-releases .release-stages::before {
    content: "";
    position: absolute;
    left: calc(var(--space-1) / 2);
    top: var(--space-2);
    bottom: var(--space-2);
    width: var(--border-thin);
    background: var(--color-line);
  }

  .page-releases .release-stage::before {
    content: "";
    position: absolute;
    left: calc(-1 * var(--rail-offset));
    top: var(--space-4);
    width: var(--dot-size);
    height: var(--dot-size);
    background: var(--color-primary);
  }

  .page-releases .release-stage:last-child::before {
    background: var(--color-accent);
  }

  .page-releases .release-stage + .release-stage {
    margin-top: var(--section-y);
  }

  .page-releases .release-stage__head {
    max-width: 60%;
  }

  .page-releases .release-stage--right .release-stage__head {
    margin-left: auto;
  }

  .page-releases .release-stage__intro--split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--gutter);
  }

  .page-releases .release-stage__intro--split .release-stage__head {
    max-width: 100%;
  }

  .page-releases .release-media--wide {
    max-width: 720px;
    margin-top: var(--space-6);
  }

  .page-releases .release-nodes {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--gutter);
    row-gap: var(--space-6);
  }

  .page-releases .release-node:nth-child(odd) {
    grid-column: 1 / span 5;
  }

  .page-releases .release-node:nth-child(even) {
    grid-column: 7 / span 6;
  }

  .page-releases .release-node {
    padding: var(--space-4);
  }

  .page-releases .release-current__panel {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--gutter);
    padding: var(--space-8) var(--space-6);
  }
}

@media (min-width: 1200px) {
  .page-releases .release-hero__title {
    max-width: 14ch;
  }

  .page-releases .release-node:nth-child(odd) {
    grid-column: 1 / span 5;
  }

  .page-releases .release-node:nth-child(even) {
    grid-column: 7 / span 6;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-releases .release-node,
  .page-releases .release-node__ver,
  .page-releases .release-figure__val,
  .page-releases .release-current__links a,
  .page-releases .release-hero__rail-list a {
    transition: none;
  }
}