.page-app-download {
  --ad-hairline: var(--color-line);
  --ad-deep-text: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent);
  --ad-deep-muted: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
  --ad-deep-rule: var(--color-contrast-line);
}

/* ---------- 上下文与首屏 ---------- */
.page-app-download .ad-context {
  padding-top: var(--space-4);
}

.page-app-download .ad-hero {
  padding: var(--space-4) 0 var(--space-6);
}

.page-app-download .ad-kicker {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--color-ink-muted);
}

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

.page-app-download .ad-hero-lede {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

/* 三个关键数字 */
.page-app-download .ad-figures {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-app-download .ad-figures::before {
  content: "";
  grid-column: 1 / -1;
  display: block;
  height: 8px;
  margin-bottom: var(--space-3);
  border-bottom: 1px solid var(--ad-hairline);
  background-image: repeating-linear-gradient(90deg, var(--ad-hairline) 0 1px, transparent 1px 14px);
  background-repeat: repeat-x;
  background-position: left bottom;
  background-size: 14px 8px;
}

.page-app-download .ad-figure {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
}

.page-app-download .ad-figure .figure-num {
  font-family: var(--font-mono);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-app-download .ad-figure--span .figure-num {
  font-size: var(--text-2xl);
}

.page-app-download .ad-figure-label {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  color: var(--color-ink);
}

.page-app-download .ad-figure-note {
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-muted);
}

/* 三块墨色对比面 */
.page-app-download .ad-faces {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: var(--space-6);
}

.page-app-download .ad-face {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
}

.page-app-download .ad-face--paper {
  background: var(--color-surface-alt);
}

.page-app-download .ad-face--stone {
  background: var(--color-surface-deep);
}

.page-app-download .ad-face--deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-app-download .ad-face-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}

.page-app-download .ad-face--deep .ad-face-index {
  color: var(--color-contrast-accent);
}

.page-app-download .ad-face-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

.page-app-download .ad-face-line {
  margin: 0;
  max-width: 30ch;
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.page-app-download .ad-face--deep .ad-face-line {
  color: var(--ad-deep-text);
}

.page-app-download .ad-face-meta {
  margin: var(--space-2) 0 0;
  padding-top: var(--space-3);
  border-top: 1px solid var(--ad-hairline);
  display: grid;
  grid-template-columns: 4.5em 1fr;
  gap: var(--space-1) var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.75;
}

.page-app-download .ad-face--deep .ad-face-meta {
  border-top-color: var(--ad-deep-rule);
}

.page-app-download .ad-face-meta dt {
  color: var(--color-ink-muted);
}

.page-app-download .ad-face--deep .ad-face-meta dt {
  color: var(--ad-deep-muted);
}

.page-app-download .ad-face-meta dd {
  margin: 0;
}

/* ---------- 首屏下方图片 ---------- */
.page-app-download .ad-hero-figure {
  margin-bottom: var(--space-6);
}

/* ---------- 对照表 ---------- */
.page-app-download .ad-versions {
  padding-top: var(--space-6);
}

.page-app-download .ad-table-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: start;
}

.page-app-download .ad-table-intro .section-note a,
.page-app-download .ad-boundary-list a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

.page-app-download .ad-table-scroll {
  margin-top: var(--space-6);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-app-download .ad-table-scroll:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 6px;
}

.page-app-download .ad-table {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  font-size: var(--text-sm);
  line-height: 1.7;
}

.page-app-download .ad-table caption {
  caption-side: top;
  text-align: left;
  padding: 0 0 var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.04em;
}

.page-app-download .ad-table th,
.page-app-download .ad-table td {
  text-align: left;
  vertical-align: top;
  padding: var(--space-2) var(--space-2) var(--space-2) 0;
  border-bottom: 1px solid var(--ad-hairline);
}

.page-app-download .ad-table thead th {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-ink-muted);
}

.page-app-download .ad-table thead th:first-child {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
  font-weight: var(--weight-body);
  align-self: end;
}

.page-app-download .ad-table th:first-child {
  width: 30%;
  padding-right: var(--space-4);
  font-weight: var(--weight-body);
  color: var(--color-ink);
}

.page-app-download .ad-table tbody td {
  color: var(--color-ink-soft);
}

.page-app-download .ad-table tbody tr:hover td,
.page-app-download .ad-table tbody tr:hover th {
  background: var(--color-primary-soft);
}

.page-app-download .ad-table tr.ad-group th {
  padding-top: var(--space-4);
  padding-bottom: var(--space-1);
  border-bottom: 1px solid var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink);
}

.page-app-download .ad-table tr.ad-group .index-num {
  color: var(--color-primary);
  margin-right: var(--space-2);
}

/* ---------- 安装前准备 ---------- */
.page-app-download .ad-prep-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-app-download .ad-steps {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  counter-reset: ad-step;
  display: grid;
  gap: 0;
}

.page-app-download .ad-step {
  counter-increment: ad-step;
  display: grid;
  grid-template-columns: 2.4em 1fr;
  gap: var(--space-2);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--ad-hairline);
}

.page-app-download .ad-step::before {
  content: counter(ad-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.9;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-app-download .ad-step-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-app-download .ad-step-text {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-step-text a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-app-download .ad-prep-aside {
  align-self: start;
}

/* ---------- 场景建议 ---------- */
.page-app-download .ad-advice {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-app-download .ad-advice-item {
  display: grid;
  grid-template-columns: 2.4em 1fr;
  grid-template-areas:
    "idx scene"
    ".   pick"
    ".   limit";
  gap: var(--space-1) var(--space-2);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--ad-hairline);
}

.page-app-download .ad-advice-item:first-child {
  border-top: 1px solid var(--ad-hairline);
}

.page-app-download .ad-advice-index {
  grid-area: idx;
  color: var(--color-ink-muted);
  line-height: 1.9;
}

.page-app-download .ad-advice-scene {
  grid-area: scene;
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-app-download .ad-advice-pick {
  grid-area: pick;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-primary);
}

.page-app-download .ad-advice-limit {
  grid-area: limit;
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-muted);
}

/* ---------- 边界说明（深色数据台） ---------- */
.page-app-download .ad-boundary {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-app-download .ad-boundary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  align-items: start;
}

.page-app-download .ad-boundary .section-index {
  color: var(--color-contrast-accent);
}

.page-app-download .ad-boundary .section-title {
  color: var(--color-contrast-ink);
}

.page-app-download .ad-boundary-lede {
  margin: var(--space-2) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--ad-deep-text);
}

.page-app-download .ad-boundary-list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-app-download .ad-boundary-list li {
  position: relative;
  padding-left: var(--space-4);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--ad-deep-text);
}

.page-app-download .ad-boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 14px;
  height: 1px;
  background: var(--color-contrast-accent);
}

.page-app-download .ad-boundary-list a {
  color: var(--color-contrast-accent);
}

.page-app-download .ad-boundary-figure img {
  display: block;
}

/* ---------- 延伸入口 ---------- */
.page-app-download .ad-nexus {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.page-app-download .ad-nexus-note {
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}

.page-app-download .ad-nexus-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-app-download .ad-nexus-list li {
  border-top: 1px solid var(--ad-hairline);
}

.page-app-download .ad-nexus-list li:last-child {
  border-bottom: 1px solid var(--ad-hairline);
}

.page-app-download .ad-nexus-list a {
  display: block;
  padding: var(--space-3) 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  text-decoration: none;
}

.page-app-download .ad-nexus-list a:hover,
.page-app-download .ad-nexus-list a:focus-visible {
  color: var(--color-primary);
}

.page-app-download .ad-nexus-list .index-num {
  display: inline-block;
  min-width: 2.4em;
  color: var(--color-ink-muted);
}

.page-app-download .ad-nexus-list a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

/* ---------- 图片容器兜底 ---------- */
.page-app-download .img-frame img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 中屏 ---------- */
@media (min-width: 720px) {
  .page-app-download .ad-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
  }

  .page-app-download .ad-table-intro {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: var(--space-8);
  }

  .page-app-download .ad-advice-item {
    grid-template-columns: 2.4em minmax(0, 1.15fr) minmax(0, 0.75fr);
    grid-template-areas:
      "idx scene pick"
      "idx scene limit";
    gap: var(--space-1) var(--space-4);
    align-items: start;
  }

  .page-app-download .ad-advice-item:first-child {
    border-top: 1px solid var(--ad-hairline);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-app-download .ad-faces {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-app-download .ad-face {
    padding: var(--space-6) var(--space-4) var(--space-6);
  }

  .page-app-download .ad-prep-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.75fr);
    gap: var(--space-8);
  }

  .page-app-download .ad-prep-aside {
    position: sticky;
    top: calc(var(--header-h, 72px) + var(--space-4));
  }

  .page-app-download .ad-boundary-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.8fr);
    gap: var(--space-8);
  }

  .page-app-download .ad-table {
    font-size: var(--text-base);
  }

  .page-app-download .ad-table th,
  .page-app-download .ad-table td {
    padding: var(--space-3) var(--space-3) var(--space-3) 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-app-download .ad-nexus-list a,
  .page-app-download .ad-table tbody tr {
    transition: none;
  }
}
</final>