.page-app-download {
  --track-rail-x: 30px;
  --track-pad: 54px;
  --track-num-w: 26px;
  --track-gap: var(--space-4);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

@media (min-width: 720px) {
  .page-app-download {
    --track-rail-x: 44px;
    --track-pad: 76px;
    --track-num-w: 36px;
  }
}

.page-app-download .container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 地层分区 ---------- */

.page-app-download .band {
  background-color: var(--color-surface);
}

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

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

.page-app-download .section {
  padding-block: var(--section-y);
}

.page-app-download .section-lg {
  padding-block: var(--section-y-lg);
}

/* ---------- 面包屑 ---------- */

.page-app-download .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-ink-muted);
}

.page-app-download .breadcrumb li + li::before {
  content: "›";
  margin-right: var(--space-1);
  color: var(--color-line);
}

.page-app-download .breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: border-color 180ms ease, color 180ms ease;
}

.page-app-download .breadcrumb a:hover,
.page-app-download .breadcrumb a:focus-visible {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.page-app-download .breadcrumb [aria-current="page"] {
  color: var(--color-ink);
  font-weight: 500;
}

/* ---------- 首屏 ---------- */

.page-app-download .hero {
  padding-block: var(--space-6) var(--space-8);
  border-bottom: var(--border-thick) solid var(--color-ink);
}

.page-app-download .hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 960px) {
  .page-app-download .hero-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.9fr);
    gap: var(--space-8);
  }
}

.page-app-download .hero-kicker {
  margin: 0 0 var(--space-3);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 500;
}

.page-app-download .display-title {
  margin: 0 0 var(--space-4);
  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 .hero-lede {
  margin: 0;
  max-width: 42ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .hero-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-app-download .figure-item {
  padding-left: var(--space-2);
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-app-download .figure-item:nth-child(2),
.page-app-download .figure-item:nth-child(4) {
  border-left-color: var(--color-accent);
}

.page-app-download .figure-num {
  display: block;
  font-size: var(--text-figure);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}

.page-app-download .figure-label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink-soft);
}

.page-app-download .media-frame {
  margin: 0;
}

.page-app-download .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--border-thick) solid var(--color-ink);
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
  box-shadow: var(--shadow-2);
}

.page-app-download .media-caption {
  margin-top: var(--space-2);
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

/* ---------- 章节头 ---------- */

.page-app-download .section-head::before {
  content: "";
  display: block;
  width: 48px;
  height: var(--border-thick);
  background-color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.page-app-download .section-kicker {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 500;
}

.page-app-download .section-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  max-width: 24ch;
}

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

.page-app-download .section-head {
  margin-bottom: var(--space-6);
}

/* ---------- 准备条件 ---------- */

.page-app-download .prep-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

@media (min-width: 900px) {
  .page-app-download .prep-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: var(--space-6) var(--space-8);
    align-items: start;
  }

  .page-app-download .prep-head {
    grid-column: 1 / -1;
  }

  .page-app-download .prep-media {
    grid-column: 1;
  }

  .page-app-download .prep-list {
    grid-column: 2;
  }
}

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

.page-app-download .prep-item {
  padding: var(--space-3);
  background-color: var(--color-surface);
  border-left: var(--border-thick) solid var(--color-primary);
  border-top: var(--border-thin) solid var(--color-line);
  border-right: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  transition: transform 160ms ease, border-color 160ms ease;
}

.page-app-download .prep-item:hover {
  transform: translateX(3px);
  border-top-color: var(--color-ink);
  border-right-color: var(--color-ink);
  border-bottom-color: var(--color-ink);
}

.page-app-download .prep-item-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.page-app-download .prep-index {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}

.page-app-download .prep-name {
  margin: 0;
  flex: 1 1 auto;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  color: var(--color-ink);
}

.page-app-download .prep-body {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .prep-rule {
  margin: 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) dashed var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-ink);
}

.page-app-download .prep-rule-label {
  display: inline-block;
  margin-right: var(--space-1);
  padding: 1px var(--space-1);
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.06em;
}

/* ---------- 状态徽标 ---------- */

.page-app-download .status-badge {
  display: inline-block;
  padding: 1px var(--space-1);
  border: var(--border-thin) solid currentColor;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--color-primary);
  background-color: color-mix(in srgb, var(--color-primary) 14%, transparent);
}

.page-app-download .status-badge.is-pass {
  color: var(--color-accent);
  background-color: color-mix(in srgb, var(--color-accent) 12%, transparent);
}

/* ---------- 步骤流程 ---------- */

.page-app-download .steps-media {
  margin-bottom: var(--space-6);
}

.page-app-download .step-track {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-app-download .step-item {
  position: relative;
  padding-left: var(--track-pad);
  padding-bottom: var(--track-gap);
}

.page-app-download .step-item:last-child {
  padding-bottom: 0;
}

.page-app-download .step-item::before {
  content: "";
  position: absolute;
  left: var(--track-rail-x);
  top: 6px;
  bottom: -6px;
  width: var(--border-thick);
  background-color: var(--color-primary);
}

.page-app-download .step-item:last-child::before {
  bottom: auto;
  height: 2.2em;
}

.page-app-download .step-num {
  position: absolute;
  left: 0;
  top: 0;
  width: var(--track-num-w);
  text-align: right;
  font-size: var(--text-lg);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}

.page-app-download .step-fold {
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.page-app-download .step-fold[open] {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-2);
}

.page-app-download .step-summary {
  display: block;
  padding: var(--space-3);
  cursor: pointer;
  list-style: none;
}

.page-app-download .step-summary::-webkit-details-marker {
  display: none;
}

.page-app-download .step-summary::marker {
  content: "";
}

.page-app-download .step-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  color: var(--color-ink);
}

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

.page-app-download .step-body {
  padding: 0 var(--space-3) var(--space-3);
}

.page-app-download .step-fields {
  margin: 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  display: grid;
  gap: var(--space-2);
}

.page-app-download .step-field {
  display: grid;
  gap: 2px;
}

.page-app-download .step-field dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

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

/* ---------- 版本差异表 ---------- */

.page-app-download .table-scroll {
  overflow-x: auto;
  border: var(--border-thick) solid var(--color-ink);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-2);
}

.page-app-download .version-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: var(--text-sm);
  line-height: 1.6;
}

.page-app-download .version-table caption {
  text-align: left;
}

.page-app-download .version-table thead th {
  position: sticky;
  top: 0;
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  text-align: left;
  border-bottom: var(--border-thin) solid var(--color-primary);
  white-space: nowrap;
}

.page-app-download .version-table tbody th {
  padding: var(--space-3);
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
  white-space: nowrap;
}

.page-app-download .version-table tbody td {
  padding: var(--space-3);
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
}

.page-app-download .version-table tbody tr:last-child th,
.page-app-download .version-table tbody tr:last-child td {
  border-bottom: none;
}

.page-app-download .version-table tbody tr:hover td,
.page-app-download .version-table tbody tr:hover th {
  background-color: color-mix(in srgb, var(--color-highlight) 38%, transparent);
}

.page-app-download .cell-flag {
  display: inline-block;
  padding: 2px var(--space-1);
  border-radius: var(--radius-sm);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

.page-app-download .table-note {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  padding-left: var(--space-2);
  border-left: var(--border-thick) solid var(--color-accent);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 结果核对 ---------- */

.page-app-download .verify-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

@media (min-width: 900px) {
  .page-app-download .verify-top {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--space-8);
  }
}

.page-app-download .check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  counter-reset: check;
}

.page-app-download .check-item {
  padding: var(--space-3);
  background-color: var(--color-surface);
  border-top: var(--border-thin) solid var(--color-line);
  border-right: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-accent);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
}

.page-app-download .check-index {
  display: block;
  margin-bottom: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.page-app-download .check-name {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  color: var(--color-ink);
}

.page-app-download .check-item p {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .check-note {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.page-app-download .fault-block {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: var(--border-thick) solid var(--color-ink);
}

.page-app-download .fault-title {
  margin: 0 0 var(--space-4);
  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-app-download .fault-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
}

@media (min-width: 720px) {
  .page-app-download .fault-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3) var(--space-4);
  }
}

.page-app-download .fault-item {
  padding: var(--space-3);
  background-color: var(--color-surface-deep);
  border-radius: var(--radius-sm);
  border-bottom: var(--border-thick) solid var(--color-line);
}

.page-app-download .fault-tag {
  display: inline-block;
  margin-bottom: var(--space-2);
  padding: 1px var(--space-1);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
  border: var(--border-thin) solid var(--color-primary);
}

.page-app-download .fault-tag.is-accent {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.page-app-download .fault-case {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: 1.4;
  color: var(--color-ink);
}

.page-app-download .fault-fix {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .fault-fix a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid currentColor;
}

.page-app-download .fault-fix a:hover,
.page-app-download .fault-fix a:focus-visible {
  color: var(--color-focus);
}

/* ---------- 相邻入口 ---------- */

.page-app-download .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
}

@media (min-width: 720px) {
  .page-app-download .next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-app-download .next-item:first-child {
    grid-column: 1 / -1;
  }
}

.page-app-download .next-link {
  display: block;
  height: 100%;
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: inherit;
  transition: transform 160ms ease, background-color 160ms ease;
}

.page-app-download .next-link:hover,
.page-app-download .next-link:focus-visible {
  transform: translateX(4px);
  background-color: var(--color-primary-soft);
}

.page-app-download .next-label {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  color: var(--color-ink);
}

.page-app-download .next-desc {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .next-note {
  margin-top: var(--space-6);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-md);
  border-left: var(--border-thick) solid var(--color-contrast-accent);
}

.page-app-download .next-note p {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
}

.page-app-download .next-note .mono {
  color: var(--color-contrast-accent);
  font-family: var(--font-mono);
}

.page-app-download .back-top {
  margin-top: var(--space-3) !important;
}

.page-app-download .back-top a {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease;
}

.page-app-download .back-top a:hover,
.page-app-download .back-top a:focus-visible {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

/* ---------- 焦点态 ---------- */

.page-app-download a:focus-visible,
.page-app-download summary:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-app-download .prep-item,
  .page-app-download .step-fold,
  .page-app-download .next-link,
  .page-app-download .breadcrumb a,
  .page-app-download .back-top a {
    transition: none;
  }

  .page-app-download .prep-item:hover,
  .page-app-download .next-link:hover,
  .page-app-download .next-link:focus-visible {
    transform: none;
  }
}