.page-releases {
  display: block;
  background: var(--color-surface);
  color: var(--color-ink);
  --rel-title: calc(var(--text-4xl) * 1.16);
  --rel-axis-x: 21px;
}

/* ============ 面包屑上方留白 ============ */
.page-releases .breadcrumb {
  padding-top: var(--space-3);
}

/* ============ 首屏 ============ */
.page-releases .releases-hero {
  padding-top: var(--space-4);
  padding-bottom: var(--space-6);
}

.page-releases .releases-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
  border-bottom: var(--border-thin) solid var(--color-line);
  padding-bottom: var(--space-4);
}

.page-releases .releases-title {
  font-family: var(--font-heading);
  font-size: var(--rel-title);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.06em;
  margin: var(--space-2) 0 var(--space-2);
  color: var(--color-ink);
}

.page-releases .releases-lead {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-ink-soft);
  max-width: 62ch;
  margin: 0 0 var(--space-4);
}

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

.page-releases .releases-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-releases .releases-stats dt {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.page-releases .releases-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  color: var(--color-primary);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-releases .stat-num {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-releases .stat-unit {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-releases .releases-hero-aside {
  display: none;
}

.page-releases .releases-hero-aside .vertical-note {
  writing-mode: vertical-rl;
  letter-spacing: 0.28em;
}

/* ============ 概览 ============ */
.page-releases .releases-intro {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.page-releases .releases-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-releases .releases-intro h2 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: 0.08em;
  margin: 0 0 var(--space-3);
}

.page-releases .releases-intro .prose {
  margin: 0 0 var(--space-3);
}

.page-releases .releases-intro .prose:last-child {
  margin-bottom: 0;
}

.page-releases .releases-intro-aside {
  border-left: var(--border-thin) solid var(--color-line);
  padding-left: var(--space-3);
}

.page-releases .side-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin: 0 0 var(--space-2);
  text-transform: uppercase;
}

.page-releases .side-text {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.85;
  color: var(--color-ink-soft);
  margin: 0;
}

/* ============ 时间线 ============ */
.page-releases .releases-timeline {
  position: relative;
  overflow: hidden;
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  background: var(--color-surface-alt);
}

.page-releases .releases-timeline-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-releases .releases-timeline-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
  filter: saturate(0.6);
}

.page-releases .releases-timeline-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    var(--color-surface-alt) 0%,
    color-mix(in srgb, var(--color-surface-alt) 74%, transparent) 25%,
    color-mix(in srgb, var(--color-surface-alt) 74%, transparent) 75%,
    var(--color-surface-alt) 100%
  );
}

.page-releases .releases-timeline-inner {
  position: relative;
  z-index: 1;
}

.page-releases .releases-timeline .section-head {
  max-width: 62ch;
  margin-bottom: var(--space-4);
}

.page-releases .section-sub {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.86;
  color: var(--color-ink-soft);
  margin: var(--space-2) 0 0;
}

.page-releases .releases-timeline .title-caps {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  letter-spacing: 0.08em;
  margin: var(--space-1) 0 0;
}

.page-releases .section-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--color-primary);
  margin: 0;
}

/* 筛选条 */
.page-releases .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .filter-label {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
  margin-right: var(--space-1);
}

.page-releases .filter-btn {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  line-height: 1;
  padding: 8px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: background-color 180ms linear, color 180ms linear, border-color 180ms linear;
}

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

.page-releases .filter-btn[aria-pressed="true"] {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: var(--weight-heading);
}

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

/* 时间线主干 */
.page-releases .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 56px;
  position: relative;
  display: grid;
  gap: var(--space-6);
}

.page-releases .timeline::before {
  content: "";
  position: absolute;
  left: var(--rel-axis-x);
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--color-primary) 0%,
    var(--color-primary) 58%,
    var(--color-primary-soft) 100%
  );
}

.page-releases .tl-item {
  position: relative;
  transition: opacity 200ms linear;
}

.page-releases .tl-item[data-filtered-out] {
  display: none;
}

.page-releases .tl-marker {
  position: absolute;
  left: -56px;
  top: 0;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--color-surface);
  border: var(--border-thick) solid var(--color-primary);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
}

.page-releases .tl-item:nth-child(2n) .tl-marker {
  background: var(--color-primary-soft);
  border-color: var(--color-primary-soft);
  color: var(--color-primary);
}

.page-releases .tl-item:nth-child(3n) .tl-marker {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-releases .tl-item:nth-child(5n) .tl-marker {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-surface);
}

.page-releases .tl-stage {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
  margin: 0 0 4px;
}

.page-releases .tl-body h3 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  line-height: 1.35;
  margin: 0 0 var(--space-1);
  color: var(--color-ink);
}

.page-releases .tl-body p {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.86;
  color: var(--color-ink-soft);
  margin: 0 0 var(--space-2);
  max-width: 62ch;
}

.page-releases .tl-result {
  font-size: var(--text-sm);
  color: var(--color-primary);
  border-left: var(--border-thick) solid var(--color-primary);
  padding-left: var(--space-2);
  margin-bottom: 0;
}

/* ============ 检索路径 ============ */
.page-releases .releases-paths {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  background: var(--color-surface);
}

.page-releases .releases-paths-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-releases .releases-paths-media .media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}

.page-releases .releases-paths-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-releases .releases-paths-media .media-content {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-3);
  background: linear-gradient(
    180deg,
    transparent 0%,
    color-mix(in srgb, var(--color-ink) 78%, transparent) 100%
  );
}

.page-releases .media-kicker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-primary-soft);
  margin: 0 0 4px;
}

.page-releases .media-line {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  color: var(--color-primary-ink);
  margin: 0;
}

.page-releases .releases-paths-main .section-head {
  max-width: 58ch;
  margin-bottom: var(--space-3);
}

.page-releases .releases-paths-main .title-caps {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  margin: var(--space-1) 0 0;
}

.page-releases .path-list {
  list-style: none;
  margin: 0 0 var(--space-4);
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-releases .path-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: var(--space-2);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .path-item[data-filtered-out] {
  display: none;
}

.page-releases .path-no {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-accent);
  letter-spacing: 0.04em;
  padding-top: 2px;
}

.page-releases .path-body h3 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  margin: 0 0 6px;
  color: var(--color-ink);
}

.page-releases .path-need {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-1);
}

.page-releases .field-tag {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 7px;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
}

.page-releases .path-body p:last-child {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.86;
  color: var(--color-ink-soft);
  margin: 0;
}

.page-releases .paths-note {
  position: relative;
  padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
  background: var(--color-primary-soft);
  border-radius: var(--radius-md);
}

.page-releases .paths-note::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--space-3);
  bottom: var(--space-3);
  width: 3px;
  background: var(--color-primary);
}

.page-releases .paths-note-title {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
}

.page-releases .paths-note p:last-child {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.86;
  color: var(--color-ink-soft);
  margin: 0;
}

/* ============ 字段 ============ */
.page-releases .releases-fields {
  position: relative;
  overflow: hidden;
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  background: var(--color-surface-alt);
}

.page-releases .releases-fields-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-releases .releases-fields-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.1;
  filter: saturate(0.5);
}

.page-releases .releases-fields > .container {
  position: relative;
  z-index: 1;
}

.page-releases .releases-fields .section-head {
  max-width: 60ch;
  margin-bottom: var(--space-4);
}

.page-releases .releases-fields .title-caps {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  margin: var(--space-1) 0 0;
}

.page-releases .field-table {
  margin: 0 0 var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .field-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-releases .field-row dt {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-primary);
}

.page-releases .field-row dd {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.page-releases .fields-window {
  max-width: 68ch;
  padding-left: var(--space-3);
  border-left: var(--border-thick) solid var(--color-accent);
}

.page-releases .fields-window-title {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
}

.page-releases .fields-window p:last-child {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.86;
  color: var(--color-ink-soft);
  margin: 0;
}

/* ============ 维护节奏 ============ */
.page-releases .releases-upkeep {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  background: var(--color-surface);
}

.page-releases .releases-upkeep-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-releases .releases-upkeep .section-head {
  margin-bottom: var(--space-3);
}

.page-releases .releases-upkeep .title-caps {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  margin: var(--space-1) 0 0;
}

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

.page-releases .upkeep-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: var(--space-2);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-releases .upkeep-no {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-primary);
}

.page-releases .upkeep-list h3 {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: 0.05em;
  margin: 0 0 6px;
  color: var(--color-ink);
}

.page-releases .upkeep-list p {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.86;
  color: var(--color-ink-soft);
  margin: 0;
  max-width: 62ch;
}

.page-releases .releases-upkeep-aside {
  padding-top: var(--space-3);
  border-top: var(--border-thick) solid var(--color-primary);
}

.page-releases .aside-note {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.9;
  color: var(--color-ink-soft);
  margin: 0;
}

/* ============ 链接基础样式（页面作用域内） ============ */
.page-releases a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 40%, transparent);
  transition: border-color 160ms linear, color 160ms linear;
}

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

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

/* ============ 平板 ============ */
@media (min-width: 720px) {
  .page-releases .releases-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-releases .releases-intro-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--space-6);
  }

  .page-releases .releases-intro-aside {
    padding-left: var(--space-4);
  }

  .page-releases .field-row {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: var(--space-3);
    align-items: baseline;
  }

  .page-releases .field-row dt {
    text-align: right;
  }

  .page-releases .releases-upkeep-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--space-6);
  }

  .page-releases .releases-upkeep-aside {
    padding-top: var(--space-4);
    padding-left: var(--space-4);
    border-top: none;
    border-left: var(--border-thick) solid var(--color-primary);
  }
}

/* ============ 桌面：时间线左右交错 ============ */
@media (min-width: 960px) {
  .page-releases .releases-hero {
    padding-bottom: var(--space-8);
  }

  .page-releases .releases-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--space-6);
  }

  .page-releases .releases-hero-aside {
    display: flex;
    justify-content: flex-end;
    align-items: flex-start;
    padding-top: var(--space-3);
    min-height: 240px;
  }

  .page-releases .releases-paths-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-releases .releases-timeline .title-caps,
  .page-releases .releases-paths-main .title-caps,
  .page-releases .releases-fields .title-caps,
  .page-releases .releases-upkeep .title-caps {
    font-size: var(--text-2xl);
  }

  .page-releases .timeline {
    padding-left: 0;
    gap: 0;
  }

  .page-releases .timeline::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-releases .tl-item {
    width: 50%;
    padding-bottom: var(--space-6);
  }

  .page-releases .tl-item:last-child {
    padding-bottom: 0;
  }

  .page-releases .tl-item:nth-child(odd) {
    margin-right: auto;
    padding-right: 48px;
  }

  .page-releases .tl-item:nth-child(even) {
    margin-left: auto;
    padding-left: 48px;
  }

  .page-releases .tl-marker {
    left: auto;
  }

  .page-releases .tl-item:nth-child(odd) .tl-marker {
    right: -22px;
    left: auto;
  }

  .page-releases .tl-item:nth-child(even) .tl-marker {
    left: -22px;
    right: auto;
  }

  .page-releases .tl-body p {
    max-width: 46ch;
  }
}

@media (min-width: 1200px) {
  .page-releases .releases-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr) minmax(0, 1fr);
  }
}

/* ============ 减少动效 ============ */
@media (prefers-reduced-motion: reduce) {
  .page-releases .filter-btn,
  .page-releases .tl-item,
  .page-releases a {
    transition: none;
  }
}