/* ===== 资料库 /library/ · page-downloads ===== */

.page-downloads {
  --lib-glow-soft: color-mix(in srgb, var(--color-primary) 38%, transparent);
  --lib-glow-strong: color-mix(in srgb, var(--color-primary) 68%, transparent);
  --lib-rule: color-mix(in srgb, var(--color-line) 78%, transparent);
  --lib-tint: color-mix(in srgb, var(--color-primary) 18%, transparent);
  display: block;
}

.page-downloads .breadcrumb {
  padding-top: var(--space-4);
}

/* ---------- 首屏 ---------- */

.page-downloads .hero {
  position: relative;
  padding-top: var(--space-6);
  padding-bottom: var(--space-8);
}

.page-downloads .hero-copy {
  max-width: 100%;
}

.page-downloads .hero-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-3) 0 0;
}

.page-downloads .hero-lede {
  max-width: var(--measure);
  margin-top: var(--space-4);
  color: var(--color-ink-soft);
  font-size: var(--text-lg);
  line-height: var(--leading-body);
}

.page-downloads .hero-lower {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.page-downloads .hero-left {
  display: grid;
  gap: var(--space-6);
  align-content: start;
}

/* 关键数字竖排 */

.page-downloads .hero-figures {
  display: grid;
  gap: 0;
}

.page-downloads .figure-cell {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--lib-rule);
}

.page-downloads .figure-cell:first-child {
  padding-top: 0;
}

.page-downloads .figure-cell:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-downloads .figure-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}

.page-downloads .figure-num--accent {
  color: var(--color-accent);
}

.page-downloads .figure-label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  color: var(--color-ink-soft);
}

.page-downloads .figure-label em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

/* 首屏媒体 */

.page-downloads .media-frame {
  margin: 0;
  overflow: hidden;
}

.page-downloads .hero-media img,
.page-downloads .compare-media img,
.page-downloads .access-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 首列预览面板 */

.page-downloads .hero-panel {
  position: relative;
  padding: var(--space-4);
  border: var(--border-thin) solid var(--lib-glow-soft);
  border-radius: var(--radius-md);
  background:
    linear-gradient(158deg, var(--lib-tint), transparent 62%),
    color-mix(in srgb, var(--color-surface-alt) 88%, transparent);
  box-shadow: var(--shadow-1);
}

.page-downloads .hero-panel-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--lib-rule);
}

.page-downloads .hero-panel-head .num {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.page-downloads .hero-panel-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--color-ink-muted);
}

.page-downloads .preview-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-1) var(--space-3);
  counter-reset: pv;
}

.page-downloads .preview-list li {
  counter-increment: pv;
  display: flex;
  gap: var(--space-1);
  padding: 0.12em 0;
  font-size: var(--text-sm);
  line-height: 1.45;
  color: var(--color-ink-soft);
}

.page-downloads .preview-list li::before {
  content: counter(pv, decimal-leading-zero);
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  padding-top: 0.18em;
}

/* 斜向速度线 */

.page-downloads .hero-speedlines {
  display: block;
  width: 100%;
  height: 72px;
  margin-top: var(--space-6);
}

.page-downloads .hero-speedlines line {
  stroke: var(--color-primary);
  stroke-width: 1;
  opacity: 0.24;
}

.page-downloads .hero-speedlines line:nth-child(2) {
  opacity: 0.38;
}

.page-downloads .hero-speedlines line:nth-child(3) {
  opacity: 0.55;
}

.page-downloads .hero-speedlines line:nth-child(4) {
  opacity: 0.85;
  stroke: var(--color-accent);
  stroke-width: 1.5;
}

/* ---------- 对照表区块 ---------- */

.page-downloads .compare-head {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.page-downloads .compare-lede {
  margin: 0;
  color: var(--color-ink-soft);
}

.page-downloads .compare-media {
  margin-bottom: var(--space-6);
  border-radius: 0;
}

.page-downloads .filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.page-downloads .filter-row .chip {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-decoration: none;
}

.page-downloads .filter-row .chip:hover,
.page-downloads .filter-row .chip:focus-visible {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: var(--color-accent);
}

.page-downloads .table-scroll {
  overflow-x: auto;
  border: var(--border-thin) solid var(--lib-glow-soft);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-1);
}

.page-downloads .library-table {
  width: 100%;
  min-width: 46rem;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.page-downloads .library-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: var(--space-3);
  text-align: left;
  white-space: nowrap;
  background: var(--color-surface-deep);
  color: var(--color-ink);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.2em;
  border-bottom: var(--border-thin) solid var(--lib-glow-soft);
}

.page-downloads .library-table tbody td {
  padding: var(--space-3);
  vertical-align: top;
  line-height: 1.5;
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid var(--lib-rule);
  transition: background-color 140ms ease, color 140ms ease;
}

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

.page-downloads .library-table tbody td:first-child {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-downloads .library-table tbody tr:hover td {
  background: var(--color-primary-soft);
  color: var(--color-ink);
}

.page-downloads .library-table tbody tr:hover td:first-child {
  background: color-mix(in srgb, var(--color-contrast-surface) 80%, var(--color-primary));
  color: var(--color-contrast-ink);
}

.page-downloads .lib-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
}

.page-downloads .lib-id {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
  font-variant-numeric: tabular-nums;
}

.page-downloads .lib-name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  color: inherit;
}

.page-downloads .lib-group {
  flex-basis: 100%;
  justify-self: start;
  align-self: flex-start;
  width: fit-content;
  padding: 0.1em 0.6em;
  border-radius: var(--radius-sm);
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
}

.page-downloads .library-table .link {
  color: var(--color-primary);
}

.page-downloads .table-note {
  margin-top: var(--space-3);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* ---------- 四组资料 ---------- */

.page-downloads .groups-head {
  max-width: 100%;
}

.page-downloads .groups-lede {
  max-width: var(--measure);
  margin-top: var(--space-3);
  color: var(--color-ink-soft);
}

.page-downloads .group-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-downloads .group-card {
  padding: var(--space-4);
}

.page-downloads .group-head-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-2);
}

.page-downloads .group-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

.page-downloads .group-head-line .panel-title {
  margin: 0;
}

.page-downloads .group-desc {
  margin: 0;
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--lib-rule);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

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

.page-downloads .group-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
}

.page-downloads .group-item .num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  padding-top: 0.3em;
  font-variant-numeric: tabular-nums;
}

.page-downloads .group-item-name {
  display: block;
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  line-height: 1.35;
}

.page-downloads .group-item-diff {
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- 选择建议 ---------- */

.page-downloads .choose-layout {
  display: grid;
  gap: var(--space-6);
}

.page-downloads .choose-lede {
  margin-top: var(--space-3);
  color: var(--color-ink-soft);
}

.page-downloads .choose-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  counter-reset: none;
}

.page-downloads .choose-item {
  position: relative;
  padding-left: var(--space-6);
}

.page-downloads .choose-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 1px;
  height: calc(100% - 0.6em);
  background: linear-gradient(180deg, var(--lib-glow-strong), transparent);
}

.page-downloads .choose-step {
  position: absolute;
  left: 0;
  top: 0;
  transform: translateX(-50%);
  background: var(--color-surface);
  padding: 0 0.3em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.page-downloads .choose-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-downloads .choose-text {
  margin: var(--space-2) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 获取方式 ---------- */

.page-downloads .access-layout {
  display: grid;
  gap: var(--space-6);
}

.page-downloads .access-media {
  border-radius: 0;
}

.page-downloads .access-lede {
  margin-top: var(--space-3);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-downloads .access-list {
  margin: var(--space-6) 0 0;
  display: grid;
  gap: 0;
}

.page-downloads .access-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-top: var(--border-thin) solid var(--lib-rule);
}

.page-downloads .access-row:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-downloads .access-row dt {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

.page-downloads .access-row dd {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-downloads .access-note {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-downloads .access-row {
    grid-template-columns: 12rem minmax(0, 1fr);
    gap: var(--space-3);
    align-items: baseline;
    padding: var(--space-3) 0;
  }

  .page-downloads .group-list {
    gap: var(--space-3);
  }
}

@media (min-width: 900px) {
  .page-downloads .hero-lower {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-downloads .compare-head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--space-8);
    align-items: end;
  }

  .page-downloads .group-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6) var(--space-4);
  }

  .page-downloads .group-card:nth-child(2) {
    margin-top: var(--space-6);
  }

  .page-downloads .group-card:nth-child(4) {
    margin-top: calc(var(--space-6) * -1 + var(--space-4));
  }

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

  .page-downloads .choose-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6) var(--space-6);
  }

  .page-downloads .access-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-downloads .table-scroll {
    max-height: 40rem;
    overflow: auto;
  }
}

@media (min-width: 1180px) {
  .page-downloads .hero-title {
    max-width: 9.2em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-downloads .library-table tbody td,
  .page-downloads .filter-row .chip {
    transition: none;
  }
}