.page-downloads {
  --lib-strip-gap: var(--border-thin);
  --lib-card-radius: var(--radius-md);
}

/* ============ 首屏 ============ */
.page-downloads .lib-hero {
  position: relative;
  overflow: hidden;
}

.page-downloads .lib-hero__crumbs {
  margin-bottom: var(--space-4);
}

.page-downloads .lib-hero__crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--text-sm);
}

.page-downloads .lib-hero__crumbs li {
  color: var(--color-contrast-ink);
  opacity: 0.72;
}

.page-downloads .lib-hero__crumbs li + li::before {
  content: "/";
  margin-right: var(--space-2);
  opacity: 0.5;
}

.page-downloads .lib-hero__crumbs a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-downloads .lib-hero__crumbs a:hover,
.page-downloads .lib-hero__crumbs a:focus-visible {
  border-bottom-color: var(--color-contrast-accent);
}

.page-downloads .lib-hero__frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-top: var(--space-6);
}

.page-downloads .lib-hero__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.96;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-downloads .lib-hero__aside {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.page-downloads .lib-hero__lead {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-contrast-ink);
}

.page-downloads .lib-hero__counts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 132px), max-content));
  gap: var(--space-3) var(--space-6);
  align-items: end;
}

.page-downloads .lib-count {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-downloads .lib-count__num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-accent);
}

.page-downloads .lib-count__unit {
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-contrast-ink);
  opacity: 0.78;
}

.page-downloads .lib-hero__strips {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--lib-strip-gap);
}

.page-downloads .lib-hero__strip {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 124px;
  padding: var(--space-4) var(--space-3);
  text-decoration: none;
  transition: filter 200ms ease;
}

.page-downloads .lib-hero__strip:hover,
.page-downloads .lib-hero__strip:focus-visible {
  filter: brightness(0.9);
}

.page-downloads .lib-hero__strip-num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-downloads .lib-hero__strip-name {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.14em;
}

.page-downloads .lib-hero__strip--sign {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-downloads .lib-hero__strip--team {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-downloads .lib-hero__strip--method {
  background: var(--color-surface-alt);
  color: var(--color-ink);
}

.page-downloads .lib-hero__strip--version {
  background: var(--color-highlight);
  color: var(--color-ink);
}

/* ============ 导语区 ============ */
.page-downloads .lib-lede {
  padding-block: var(--section-y);
}

.page-downloads .lib-lede__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-downloads .lib-lede__figure {
  margin: 0;
}

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

.page-downloads .lib-lede__text {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.page-downloads .lib-lede__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-downloads .lib-lede__p {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ============ 目录主体 ============ */
.page-downloads .lib-catalog {
  padding-block: 0 var(--section-y);
}

.page-downloads .lib-catalog__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-8);
}

.page-downloads .lib-rail {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.page-downloads .lib-rail__eyebrow {
  margin: 0;
}

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

.page-downloads .lib-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-downloads .lib-rail__list li + li {
  border-top: var(--border-thin) solid var(--color-line);
}

.page-downloads .lib-rail__list a {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
  transition: color 180ms ease, border-color 180ms ease;
  border-left: calc(var(--border-thin) * 2) solid transparent;
  padding-left: var(--space-2);
}

.page-downloads .lib-rail__list a .num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-downloads .lib-rail__list a:hover,
.page-downloads .lib-rail__list a:focus-visible {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

.page-downloads .lib-rail__filter {
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-ink);
}

.page-downloads .lib-rail__filter-title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.page-downloads .lib-rail__chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.page-downloads .lib-chip {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  line-height: 1.2;
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}

.page-downloads .lib-chip:hover,
.page-downloads .lib-chip:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.page-downloads .lib-chip.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-downloads .lib-rail__note {
  margin: 0;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ============ 分组 ============ */
.page-downloads .lib-groups {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.page-downloads .lib-group {
  scroll-margin-top: var(--space-8);
}

.page-downloads .lib-group__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: start;
  gap: var(--space-2) var(--space-3);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-ink);
}

.page-downloads .lib-group__disc {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-downloads .lib-group--sign .lib-group__disc {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-downloads .lib-group--team .lib-group__disc {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-downloads .lib-group--method .lib-group__disc {
  background: var(--color-surface-deep);
  color: var(--color-ink);
}

.page-downloads .lib-group--version .lib-group__disc {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
}

.page-downloads .lib-group__headtext {
  min-width: 0;
}

.page-downloads .lib-group__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-downloads .lib-group__desc {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-downloads .lib-group__count {
  grid-column: 1 / -1;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
}

.page-downloads .lib-group__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-downloads .lib-group__entries {
  display: flex;
  flex-direction: column;
}

.page-downloads .lib-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  padding-block: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-downloads .lib-group__entries > .lib-card:first-child {
  border-top: 0;
  padding-top: var(--space-4);
}

.page-downloads .lib-card__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-ink);
}

.page-downloads .lib-card__body {
  min-width: 0;
}

.page-downloads .lib-card__title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-ink);
}

.page-downloads .lib-card__desc {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-downloads .lib-card__meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
  margin: var(--space-3) 0 0;
}

.page-downloads .lib-card__meta-item {
  min-width: 0;
}

.page-downloads .lib-card__meta dt {
  margin: 0 0 calc(var(--space-1) / 2);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-downloads .lib-card__meta dd {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink);
}

/* 版本记录组：更窄更小的次级版面 */
.page-downloads .lib-group--version .lib-group__entries {
  padding-left: var(--space-4);
  border-left: calc(var(--border-thin) * 3) solid var(--color-surface-deep);
}

.page-downloads .lib-group--version .lib-card {
  padding-block: var(--space-3);
  gap: var(--space-2);
}

.page-downloads .lib-group--version .lib-card__no {
  width: 34px;
  height: 34px;
  font-size: var(--text-xs);
  background: var(--color-surface);
}

.page-downloads .lib-group--version .lib-card__title {
  font-size: var(--text-sm);
}

.page-downloads .lib-group--version .lib-card__desc,
.page-downloads .lib-group--version .lib-card__meta dd {
  font-size: var(--text-xs);
}

/* ============ 分组内配图 ============ */
.page-downloads .lib-group__figure {
  margin: 0;
}

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

.page-downloads .lib-group__figure .figure__caption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

/* ============ 折叠说明 ============ */
.page-downloads .lib-group__note {
  margin-top: var(--space-6);
  border: var(--border-thin) solid var(--color-line);
}

.page-downloads .lib-group__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-3);
  background: var(--color-surface-alt);
  border: 0;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  text-align: left;
  color: var(--color-ink);
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease;
}

.page-downloads .lib-group__trigger:hover,
.page-downloads .lib-group__trigger:focus-visible {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.page-downloads .lib-group__trigger[aria-expanded="true"] {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: calc(var(--border-thin) * -1);
}

.page-downloads .lib-group__panel {
  padding: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
}

.page-downloads .lib-group__panel p {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ============ 使用边界 ============ */
.page-downloads .lib-bounds {
  padding-block: var(--section-y);
}

.page-downloads .lib-bounds__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-downloads .lib-bounds__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-contrast-ink);
}

.page-downloads .lib-bounds__text {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.page-downloads .lib-bounds__p {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-downloads .lib-bounds__p a {
  color: var(--color-contrast-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  transition: border-color 180ms ease;
}

.page-downloads .lib-bounds__p a:hover,
.page-downloads .lib-bounds__p a:focus-visible {
  border-bottom-color: var(--color-contrast-accent);
}

/* ============ 快捷路径 ============ */
.page-downloads .lib-quick {
  display: none;
}

.page-downloads .lib-quick__link {
  writing-mode: vertical-rl;
  padding: var(--space-3) var(--space-1);
  border-radius: var(--radius-pill);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-decoration: none;
  transition: background 180ms ease, color 180ms ease;
}

.page-downloads .lib-quick__link:hover,
.page-downloads .lib-quick__link:focus-visible {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-downloads .lib-hero__counts {
    grid-template-columns: repeat(3, max-content);
    column-gap: var(--space-8);
  }

  .page-downloads .lib-count:nth-child(2) {
    padding-top: var(--space-4);
  }

  .page-downloads .lib-count:nth-child(3) {
    padding-bottom: var(--space-3);
  }

  .page-downloads .lib-card__meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-downloads .lib-card__meta-item + .lib-card__meta-item {
    border-left: var(--border-thin) solid var(--color-line);
    padding-left: var(--space-3);
  }
}

@media (min-width: 900px) {
  .page-downloads .lib-hero__frame {
    grid-template-columns: minmax(0, 168px) minmax(0, 1fr);
    grid-template-areas:
      "title aside"
      "title strips";
    column-gap: var(--space-8);
    row-gap: var(--space-6);
    padding-top: var(--space-8);
  }

  .page-downloads .lib-hero__title {
    grid-area: title;
    writing-mode: vertical-rl;
    text-orientation: upright;
  }

  .page-downloads .lib-hero__aside {
    grid-area: aside;
  }

  .page-downloads .lib-hero__strips {
    grid-area: strips;
    grid-template-columns: 1.05fr 1.35fr 0.92fr 0.78fr;
  }

  .page-downloads .lib-hero__strip {
    min-height: 148px;
  }

  .page-downloads .lib-lede__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    column-gap: var(--space-8);
    align-items: start;
  }

  .page-downloads .lib-lede__figure {
    margin-top: var(--space-4);
  }

  .page-downloads .lib-group__head {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: var(--space-3);
  }

  .page-downloads .lib-group__count {
    grid-column: auto;
    justify-self: end;
  }

  .page-downloads .lib-group__body--team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.6fr);
    column-gap: var(--space-6);
    align-items: start;
  }

  .page-downloads .lib-group__body--method {
    grid-template-columns: minmax(0, 0.52fr) minmax(0, 1fr);
    column-gap: var(--space-6);
    align-items: start;
  }

  .page-downloads .lib-group__figure {
    position: sticky;
    top: var(--space-6);
  }

  .page-downloads .lib-bounds__inner {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1fr);
    column-gap: var(--space-8);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-downloads .lib-catalog__grid {
    grid-template-columns: minmax(0, 236px) minmax(0, 1fr);
    column-gap: var(--space-8);
    align-items: start;
  }

  .page-downloads .lib-rail {
    position: sticky;
    top: var(--space-4);
  }

  .page-downloads .lib-groups {
    gap: var(--space-8);
  }
}

@media (min-width: 1340px) {
  .page-downloads .lib-quick {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    position: fixed;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-downloads .lib-hero__strip,
  .page-downloads .lib-chip,
  .page-downloads .lib-group__trigger,
  .page-downloads .lib-quick__link,
  .page-downloads .lib-rail__list a {
    transition: none;
  }

  .page-downloads .lib-group__figure {
    position: static;
  }
}