.page-releases {
  --rl-gap-tight: calc(var(--space-1) / 2);
  background: var(--color-surface);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-releases .rl-hero {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-6) 0 var(--space-8);
  border-bottom: var(--border-thick) solid var(--color-primary);
}

.page-releases .rl-hero .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-4);
  padding: 0;
  list-style: none;
  font-size: var(--text-sm);
  color: var(--color-contrast-line);
}

.page-releases .rl-hero .breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-1);
  color: var(--color-contrast-line);
}

.page-releases .rl-hero .breadcrumb a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-releases .rl-hero .breadcrumb a:hover,
.page-releases .rl-hero .breadcrumb a:focus-visible {
  border-bottom-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

.page-releases .rl-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-contrast-accent);
  margin: 0 0 var(--space-2);
}

.page-releases .rl-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-contrast-ink);
  margin: 0 0 var(--space-3);
  max-width: 22ch;
}

.page-releases .rl-lede {
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
  max-width: 56ch;
  margin: 0 0 var(--space-6);
}

.page-releases .rl-span {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-4);
}

.page-releases .rl-span-year {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-accent);
  white-space: nowrap;
}

.page-releases .rl-span-track {
  flex: 1 1 auto;
  min-width: var(--space-4);
  height: var(--border-thin);
  background: var(--color-contrast-line);
}

.page-releases .rl-density {
  display: flex;
  align-items: flex-end;
  gap: var(--space-1);
  height: calc(var(--space-8) * 2 + var(--space-3));
  margin: 0 0 var(--space-6);
}

.page-releases .rl-density-bar {
  flex: 1 1 0;
  min-width: var(--space-1);
  background: var(--color-primary);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.page-releases .rl-density-bar:nth-child(1) { height: 29%; }
.page-releases .rl-density-bar:nth-child(2) { height: 36%; }
.page-releases .rl-density-bar:nth-child(3) { height: 26%; }
.page-releases .rl-density-bar:nth-child(4) { height: 76%; }
.page-releases .rl-density-bar:nth-child(5) { height: 69%; }
.page-releases .rl-density-bar:nth-child(6) { height: 72%; }
.page-releases .rl-density-bar:nth-child(7) { height: 91%; }
.page-releases .rl-density-bar:nth-child(8) { height: 88%; }
.page-releases .rl-density-bar:nth-child(9) { height: 83%; }
.page-releases .rl-density-bar:nth-child(10) { height: 100%; }
.page-releases .rl-density-bar:nth-child(11) {
  height: 95%;
  background: var(--color-contrast-accent);
}

.page-releases .rl-figures {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-releases .rl-figures li {
  border-left: var(--border-thick) solid var(--color-contrast-accent);
  padding-left: var(--space-3);
}

.page-releases .rl-figure-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-ink);
}

.page-releases .rl-figure-cap {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

/* ---------- 通栏图 ---------- */
.page-releases .rl-banner {
  margin: 0;
  background: var(--color-surface-deep);
  border-bottom: var(--border-thick) solid var(--color-contrast-surface);
}

.page-releases .rl-banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-releases .rl-banner figcaption {
  padding: var(--space-2) 0;
  font-size: var(--text-xs);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

/* ---------- 分组索引 ---------- */
.page-releases .rl-index {
  background: var(--color-surface-alt);
  border-bottom: var(--border-thick) solid var(--color-line);
  padding: var(--space-3) 0;
}

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

.page-releases .rl-index-list a {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  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);
  text-decoration: none;
  font-size: var(--text-sm);
  box-shadow: var(--shadow-1);
  transition: border-color 200ms ease, transform 200ms ease;
}

.page-releases .rl-index-list a:hover,
.page-releases .rl-index-list a:focus-visible {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

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

/* ---------- 阶段分组 ---------- */
.page-releases .rl-phase {
  padding: var(--space-6) 0 var(--space-8);
}

.page-releases .rl-phase-a { background: var(--color-surface); }
.page-releases .rl-phase-b { background: var(--color-surface-alt); }
.page-releases .rl-phase-c { background: var(--color-surface-deep); }
.page-releases .rl-phase-d { background: var(--color-surface-alt); }

.page-releases .rl-phase-inner {
  padding-left: calc(var(--gutter) + var(--space-1));
}

.page-releases .rl-phase-head {
  max-width: 62ch;
  margin-bottom: var(--space-6);
  border-left: var(--border-thick) solid var(--color-primary);
  padding-left: var(--space-3);
}

.page-releases .rl-phase-b .rl-phase-head { border-left-color: var(--color-accent); }
.page-releases .rl-phase-d .rl-phase-head { border-left-color: var(--color-accent); }

.page-releases .rl-phase-index {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin: 0 0 var(--space-1);
}

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

.page-releases .rl-phase-summary {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  margin: 0 0 var(--space-2);
}

.page-releases .rl-phase-scale {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  margin: 0;
}

/* ---------- 时间线主轴与节点 ---------- */
.page-releases .rl-nodes {
  position: relative;
  margin: 0;
  padding: 0 0 0 var(--space-3);
  list-style: none;
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-releases .rl-phase-b .rl-nodes,
.page-releases .rl-phase-d .rl-nodes {
  border-left-color: var(--color-accent);
}

.page-releases .rl-node {
  position: relative;
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
  padding: var(--space-3);
  margin-bottom: var(--space-3);
  transition: border-color 200ms ease;
}

.page-releases .rl-node:last-child {
  margin-bottom: 0;
}

.page-releases .rl-node:hover {
  border-color: var(--color-primary);
}

.page-releases .rl-node::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-3) - var(--border-thick));
  top: var(--space-4);
  width: var(--space-2);
  height: var(--border-thick);
  background: var(--color-primary);
}

.page-releases .rl-phase-b .rl-node::before,
.page-releases .rl-phase-d .rl-node::before {
  background: var(--color-accent);
}

.page-releases .rl-node-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.page-releases .rl-node-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-accent);
  background: var(--color-highlight);
  border-radius: var(--radius-sm);
  padding: var(--radius-md) var(--space-1);
}

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

.page-releases .rl-status-archived {
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  border-color: var(--color-line);
}

.page-releases .rl-status-current {
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.page-releases .rl-status-revising {
  background: var(--color-highlight);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

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

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

.page-releases .rl-node-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin: var(--space-3) 0 0;
  padding: var(--space-2) 0 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .rl-node-meta dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin-bottom: var(--radius-sm);
}

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

.page-releases .rl-node-outcome {
  margin-top: var(--space-3);
  border-top: var(--border-thin) dashed var(--color-line);
  padding-top: var(--space-2);
}

.page-releases .rl-node-outcome summary {
  cursor: pointer;
  list-style: none;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-accent);
  padding: var(--space-1) 0;
}

.page-releases .rl-node-outcome summary::-webkit-details-marker {
  display: none;
}

.page-releases .rl-node-outcome summary::before {
  content: "▸";
  font-family: var(--font-mono);
  margin-right: var(--space-1);
}

.page-releases .rl-node-outcome[open] summary::before {
  content: "▾";
}

.page-releases .rl-node-outcome .fold-content p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 变更记录字段 ---------- */
.page-releases .rl-record {
  background: var(--color-surface);
  padding: var(--space-8) 0;
  border-top: var(--border-thick) solid var(--color-line);
}

.page-releases .rl-section-head {
  max-width: 62ch;
  margin-bottom: var(--space-6);
}

.page-releases .rl-section-index {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin: 0 0 var(--space-1);
}

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

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

.page-releases .rl-record-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: start;
  margin-bottom: var(--space-6);
}

.page-releases .rl-record-text 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-3);
}

.page-releases .rl-record-text p:last-child {
  margin-bottom: 0;
}

.page-releases .rl-record-media,
.page-releases .rl-state-media {
  margin: 0;
  border: var(--border-thick) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  padding: var(--space-1);
  box-shadow: var(--shadow-2);
}

.page-releases .rl-record-media img,
.page-releases .rl-state-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-releases .rl-record-media figcaption,
.page-releases .rl-state-media figcaption {
  display: block;
  padding: var(--space-2) var(--space-1) var(--space-1);
  font-size: var(--text-xs);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

.page-releases .rl-table-wrap {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  margin-bottom: var(--space-6);
}

.page-releases .rl-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.page-releases .rl-table th {
  background: var(--color-primary-soft);
  color: var(--color-ink);
  font-weight: 500;
  text-align: left;
  padding: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-primary);
  white-space: nowrap;
}

.page-releases .rl-table td {
  padding: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  vertical-align: top;
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-releases .rl-table td:first-child {
  font-family: var(--font-mono);
  color: var(--color-accent);
  white-space: nowrap;
}

.page-releases .rl-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-releases .rl-sample {
  margin: 0;
  background: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

.page-releases .rl-sample-cap {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-2);
}

.page-releases .rl-sample-fields {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin: 0;
}

.page-releases .rl-sample-fields dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin-bottom: var(--radius-sm);
}

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

/* ---------- 状态口径 ---------- */
.page-releases .rl-states {
  background: var(--color-surface-alt);
  padding: var(--space-8) 0;
  border-top: var(--border-thick) solid var(--color-line);
}

.page-releases .rl-states-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: start;
  margin-bottom: var(--space-4);
}

.page-releases .rl-state-list {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-releases .rl-state-item {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  box-shadow: var(--shadow-1);
}

.page-releases .rl-state-item h3 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
}

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

.page-releases .rl-state-revising { border-left-color: var(--color-accent); }
.page-releases .rl-state-archived { border-left-color: var(--color-ink-muted); }
.page-releases .rl-state-retired { border-left-color: var(--color-line); }

.page-releases .rl-rhythm {
  background: var(--color-primary-soft);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

.page-releases .rl-rhythm h3 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

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

/* ---------- 当前版本 ---------- */
.page-releases .rl-current {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-8) 0;
  border-top: var(--border-thick) solid var(--color-primary);
  border-bottom: var(--border-thick) solid var(--color-primary);
}

.page-releases .rl-current-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-contrast-accent);
  margin: 0 0 var(--space-2);
}

.page-releases .rl-current-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
  margin: 0 0 var(--space-3);
  max-width: 24ch;
}

.page-releases .rl-current-lede {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
  max-width: 60ch;
  margin: 0 0 var(--space-4);
}

/* ---------- 相邻入口 ---------- */
.page-releases .rl-next {
  background: var(--color-surface);
  padding: var(--space-8) 0;
}

.page-releases .rl-next-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-releases .rl-next-list li {
  border-top: var(--border-thick) solid var(--color-primary);
  padding-top: var(--space-2);
}

.page-releases .rl-next-list li:nth-child(2) { border-top-color: var(--color-accent); }
.page-releases .rl-next-list li:nth-child(3) { border-top-color: var(--color-ink-muted); }

.page-releases .rl-next-list h3 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  margin: 0 0 var(--space-2);
}

.page-releases .rl-next-list h3 a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .rl-next-list h3 a:hover,
.page-releases .rl-next-list h3 a:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

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

/* ---------- 焦点可见性 ---------- */
.page-releases a:focus-visible,
.page-releases summary:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: var(--radius-md);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-releases .rl-figures {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
  }

  .page-releases .rl-node-meta {
    grid-template-columns: 1fr 1fr;
  }

  .page-releases .rl-sample-fields {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .page-releases .rl-hero {
    padding: var(--space-8) 0 var(--space-8);
  }

  .page-releases .rl-phase {
    padding: var(--space-6) 0 var(--section-y);
  }

  .page-releases .rl-phase-inner {
    padding-left: calc(var(--gutter) + var(--space-2));
  }

  .page-releases .rl-phase-b .rl-phase-inner {
    padding-left: calc(var(--gutter) + var(--space-6));
  }

  .page-releases .rl-phase-a .rl-nodes,
  .page-releases .rl-phase-c .rl-nodes {
    padding-left: var(--space-4);
  }

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

  .page-releases .rl-node::before {
    left: calc(-1 * var(--space-4) - var(--border-thick));
  }

  .page-releases .rl-record-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: var(--space-6);
  }

  .page-releases .rl-states-grid {
    grid-template-columns: 1.3fr 1fr;
    gap: var(--space-6);
  }

  .page-releases .rl-next-list {
    grid-template-columns: 1.15fr 1fr 0.9fr;
    gap: var(--space-4);
  }

  .page-releases .rl-sample {
    padding: var(--space-4);
  }
}

@media (min-width: 1120px) {
  .page-releases .rl-span-track {
    max-width: 720px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-releases .rl-index-list a,
  .page-releases .rl-node {
    transition: none;
  }

  .page-releases .rl-index-list a:hover {
    transform: none;
  }
}