.page-app-download {
  --cmp-pad-y: var(--space-2);
  --cmp-pad-x: var(--space-3);
}

/* ---------- 首屏 ---------- */

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

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

.page-app-download .hero-main {
  min-width: 0;
}

.page-app-download .hero .crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-3);
}

.page-app-download .hero .crumbs a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
}

.page-app-download .hero .crumbs a:hover {
  border-bottom-color: var(--color-primary);
}

.page-app-download .hero-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-3);
  max-width: 16ch;
}

.page-app-download .hero-lede {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: 56ch;
  margin: 0;
}

.page-app-download .hero-side {
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-3);
}

.page-app-download .hero-side-label {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-2);
}

.page-app-download .plat-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-4);
}

.page-app-download .plat-tag {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  line-height: 1.2;
  padding: 6px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  color: var(--color-ink-soft);
  background: var(--color-surface-alt);
}

.page-app-download .hero-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  margin: 0;
}

.page-app-download .hero-figure {
  border-left: var(--border-thin) solid var(--color-line);
  padding-left: var(--space-2);
}

.page-app-download .hero-figure dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin-bottom: 4px;
}

.page-app-download .hero-figure dd {
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  line-height: 1;
  color: var(--color-ink);
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.page-app-download .fig-unit {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ---------- 首屏下方图 ---------- */

.page-app-download .hero-visual {
  margin-block: var(--space-6) 0;
}

.page-app-download .figure-cap {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin: var(--space-2) 0 0;
}

.page-app-download .figure-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 文档栅格：索引轨道 + 正文 ---------- */

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

.page-app-download .rail {
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
  padding: var(--space-3);
}

.page-app-download .rail-label {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-2);
}

.page-app-download .rail-list {
  list-style: none;
  margin: 0 0 var(--space-3);
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-app-download .rail-link {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  padding: 6px 0 6px 10px;
  border-left: 2px solid transparent;
}

.page-app-download .rail-link:hover {
  color: var(--color-primary);
  border-left-color: var(--color-line);
}

.page-app-download .rail-link[aria-current="true"] {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

.page-app-download .rail-status {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin: 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

/* ---------- 章节通用 ---------- */

.page-app-download .doc-body {
  min-width: 0;
}

.page-app-download .section {
  padding-block: var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-app-download .section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-app-download .section--lg {
  padding-block: var(--space-8);
}

.page-app-download .section-head {
  margin-bottom: var(--space-4);
}

.page-app-download .section-kicker {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-primary);
  margin: 0 0 var(--space-2);
}

.page-app-download .section-head h2 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

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

/* ---------- 端切换 ---------- */

.page-app-download .plat-switch {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.page-app-download .plat-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.page-app-download .plat-switch-label {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  padding: 6px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  color: var(--color-ink-soft);
  background: var(--color-surface);
  cursor: pointer;
}

.page-app-download .plat-switch-label:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.page-app-download .plat-radio:checked + .plat-switch-label {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.page-app-download .plat-radio:focus-visible + .plat-switch-label {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 对照表 ---------- */

.page-app-download .cmp-scroll {
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
}

.page-app-download .cmp-table {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  font-size: var(--text-sm);
  line-height: 1.5;
}

.page-app-download .cmp-table th,
.page-app-download .cmp-table td {
  padding: var(--cmp-pad-y) var(--cmp-pad-x);
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
  border-right: var(--border-thin) solid var(--color-line);
}

.page-app-download .cmp-table tr > *:last-child {
  border-right: 0;
}

.page-app-download .cmp-table tbody tr:last-child > * {
  border-bottom: 0;
}

.page-app-download .cmp-table thead th {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  font-weight: var(--weight-heading);
  color: var(--color-ink-soft);
  background: var(--color-surface-alt);
  white-space: nowrap;
}

.page-app-download .cmp-table .cmp-corner {
  color: var(--color-ink-muted);
}

.page-app-download .cmp-table tbody th {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  background: var(--color-surface);
  white-space: nowrap;
}

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

.page-app-download .cmp-table td.mono {
  font-family: var(--font-mono);
  color: var(--color-ink);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.page-app-download .cmp-table tbody tr:hover > * {
  background: var(--color-primary-soft);
}

.page-app-download:has(#col-iphone:checked) thead .col-iphone,
.page-app-download:has(#col-ipad:checked) thead .col-ipad,
.page-app-download:has(#col-android:checked) thead .col-android,
.page-app-download:has(#col-web:checked) thead .col-web {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-app-download .cmp-foot {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin: var(--space-2) 0 0;
}

/* ---------- 对照表下方图 ---------- */

.page-app-download .wrap-inline {
  margin-block: var(--space-6);
}

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

.page-app-download .aside-note a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-primary-soft);
}

.page-app-download .aside-note a:hover {
  border-bottom-color: var(--color-primary);
}

/* ---------- 三组结论 ---------- */

.page-app-download .diff-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-app-download .diff-list {
  display: grid;
  gap: var(--space-4);
}

.page-app-download .diff-item {
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-2);
}

.page-app-download .diff-num {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin: 0 0 var(--space-1);
}

.page-app-download .diff-item h3 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

.page-app-download .diff-item p {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  margin: 0 0 var(--space-1);
  max-width: 46ch;
}

.page-app-download .diff-tail {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin: 0;
}

.page-app-download .diff-figure {
  margin: 0;
}

/* ---------- 刻度式准备清单 ---------- */

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

.page-app-download .prep-item {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-2);
}

.page-app-download .prep-tick {
  color: var(--color-primary);
  display: block;
}

.page-app-download .prep-item h3 {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 4px;
}

.page-app-download .prep-item p {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  margin: 0;
  max-width: 52ch;
}

/* ---------- 人群建议 ---------- */

.page-app-download .pick-figure {
  margin: 0 0 var(--space-4);
}

.page-app-download .pick-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-app-download .pick-item {
  border-top: var(--border-thin) solid var(--color-line);
  padding: var(--space-3) 0;
}

.page-app-download .pick-item:last-child {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .pick-tag {
  display: inline-block;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-accent);
  background: var(--color-highlight);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  margin: 0 0 var(--space-1);
}

.page-app-download .pick-item h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
}

.page-app-download .pick-item p {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  margin: 0;
  max-width: 52ch;
}

/* ---------- 出口 ---------- */

.page-app-download .exit-zone {
  margin-top: var(--space-8);
  background: var(--color-contrast-surface);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  padding-block: var(--space-8);
}

.page-app-download .exit-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  align-items: start;
}

.page-app-download .exit-kicker {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-contrast-accent);
  margin: 0 0 var(--space-2);
}

.page-app-download .exit-copy h2 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  margin: 0 0 var(--space-2);
}

.page-app-download .exit-copy p {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.86;
  margin: 0 0 var(--space-2);
  max-width: 56ch;
}

.page-app-download .exit-contact a {
  color: var(--color-contrast-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.page-app-download .exit-contact a:hover {
  border-bottom-color: var(--color-contrast-accent);
}

.page-app-download .exit-actions {
  display: grid;
  gap: var(--space-1);
}

.page-app-download .exit-zone .btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-lg);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  padding: 10px 16px;
  text-align: center;
  text-decoration: none;
}

.page-app-download .exit-zone .btn-outline {
  background: transparent;
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  padding: 10px 16px;
  text-align: center;
  text-decoration: none;
}

.page-app-download .exit-zone .btn-quiet {
  background: transparent;
  color: var(--color-contrast-ink);
  opacity: 0.72;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-lg);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  padding: 10px 16px;
  text-align: center;
  text-decoration: none;
}

.page-app-download .exit-zone .btn-primary:hover,
.page-app-download .exit-zone .btn-outline:hover,
.page-app-download .exit-zone .btn-quiet:hover {
  transform: translateY(-2px);
}

.page-app-download .exit-zone a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-app-download .prep-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3) var(--space-4);
  }

  .page-app-download .pick-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-app-download .pick-item {
    border-bottom: var(--border-thin) solid var(--color-line);
    padding: var(--space-3) var(--space-3) var(--space-3) 0;
    border-right: var(--border-thin) solid var(--color-line);
  }

  .page-app-download .pick-item:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-app-download .pick-item:first-child {
    padding-left: 0;
  }

  .page-app-download .pick-item:not(:first-child) {
    padding-left: var(--space-3);
  }
}

@media (min-width: 960px) {
  .page-app-download .hero {
    padding-block: var(--space-8);
  }

  .page-app-download .hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: var(--space-8);
  }

  .page-app-download .hero-side {
    border-top: 0;
    border-left: var(--border-thin) solid var(--color-line);
    padding-top: 0;
    padding-left: var(--space-4);
  }

  .page-app-download .diff-split {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-app-download .diff-list {
    gap: var(--space-6);
  }

  .page-app-download .exit-grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: var(--space-8);
  }
}

@media (min-width: 1024px) {
  .page-app-download .doc-grid {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-app-download .rail {
    position: sticky;
    top: 88px;
  }

  .page-app-download .prep-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-app-download .rail-link,
  .page-app-download .exit-zone .btn-primary,
  .page-app-download .exit-zone .btn-outline,
  .page-app-download .exit-zone .btn-quiet {
    transition: none;
  }

  .page-app-download .exit-zone .btn-primary:hover,
  .page-app-download .exit-zone .btn-outline:hover,
  .page-app-download .exit-zone .btn-quiet:hover {
    transform: none;
  }
}
<<<END>>>