.page-app-download {
  --ad-line-double: linear-gradient(
    to bottom,
    var(--color-primary) 0 2px,
    var(--color-line) 2px 3px
  );
}

/* 面包屑 */
.page-app-download .ad-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: var(--space-4) 0 0;
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

.page-app-download .ad-crumb li {
  display: inline-flex;
  align-items: center;
}

.page-app-download .ad-crumb li + li::before {
  content: "/";
  margin: 0 var(--space-1);
  color: var(--color-line);
}

.page-app-download .ad-crumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
}

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

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

/* 首屏深色记分区 */
.page-app-download .ad-hero {
  position: relative;
  margin-top: var(--space-4);
  padding: var(--space-8) 0 var(--space-8);
  background-color: var(--color-contrast-surface);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-contrast-line) 0 1px,
    transparent 1px 128px
  );
  color: var(--color-contrast-ink);
}

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

.page-app-download .ad-hero .eyebrow {
  color: var(--color-contrast-accent);
}

.page-app-download .ad-hero__title {
  margin: var(--space-3) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.04;
  letter-spacing: 0.03em;
  color: var(--color-contrast-ink);
  text-wrap: balance;
}

.page-app-download .ad-hero__intro {
  max-width: 56ch;
  margin: var(--space-4) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
}

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

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

.page-app-download .ad-figure__value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 0.95;
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-accent);
}

.page-app-download .ad-figure__unit {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

.page-app-download .ad-hero__media {
  margin: 0;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-contrast-surface);
}

.page-app-download .ad-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-app-download .ad-hero__cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: 0;
}

.page-app-download .ad-form-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-contrast-ink) 5%, transparent);
}

.page-app-download .ad-form-card__name {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.16em;
  color: var(--color-contrast-ink);
}

.page-app-download .ad-form-card__line {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.page-app-download .ad-form-card__count {
  margin: auto 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

.page-app-download .ad-form-card__count span {
  font-size: var(--text-xl);
  color: var(--color-contrast-accent);
}

/* 双线分节 */
.page-app-download .ad-compare,
.page-app-download .ad-prep,
.page-app-download .ad-choose {
  border-top: 0;
}

.page-app-download .ad-compare::before,
.page-app-download .ad-prep::before,
.page-app-download .ad-choose::before {
  content: "";
  display: block;
  height: 3px;
  background: var(--ad-line-double);
}

/* 对比表区块 */
.page-app-download .ad-compare__intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin: var(--space-4) 0 var(--space-6);
}

.page-app-download .ad-compare__figure {
  margin: 0;
}

.page-app-download .ad-compare__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-compare__figure figcaption,
.page-app-download .ad-prep__figure figcaption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--color-ink-muted);
}

.page-app-download .ad-compare__legend p {
  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-compare__legend a,
.page-app-download .ad-cap-table a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-primary-soft);
}

.page-app-download .ad-compare__legend a:hover,
.page-app-download .ad-cap-table a:hover {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent);
}

.page-app-download .ad-legend {
  display: grid;
  gap: var(--space-2);
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
}

.page-app-download .ad-legend li {
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr);
  gap: var(--space-2);
  align-items: start;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-app-download .ad-legend strong {
  color: var(--color-ink);
  font-weight: 500;
}

/* 能力标记方块 */
.page-app-download .cap-mark {
  display: inline-block;
  width: 13px;
  height: 13px;
  border-radius: 2px;
  vertical-align: -1px;
  margin-right: 7px;
  flex: none;
}

.page-app-download .ad-legend .cap-mark {
  margin-right: 0;
  margin-top: 4px;
}

.page-app-download .cap-mark--full,
.page-app-download .cap-full .cap-mark {
  background: var(--color-accent);
  border: var(--border-thin) solid var(--color-accent);
}

.page-app-download .cap-mark--half,
.page-app-download .cap-half .cap-mark {
  background: linear-gradient(
    90deg,
    var(--color-primary) 0 50%,
    transparent 50% 100%
  );
  border: var(--border-thin) solid var(--color-primary);
}

.page-app-download .cap-mark--none,
.page-app-download .cap-none .cap-mark {
  background: transparent;
  border: var(--border-thin) solid var(--color-line);
}

/* 折叠分组 */
.page-app-download .ad-group {
  margin-top: var(--space-4);
}

.page-app-download .ad-group .panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-group .panel__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.08em;
  color: var(--color-ink);
}

.page-app-download .ad-group .panel__toggle {
  flex: none;
  padding: var(--space-1) var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: border-color 150ms ease-out, color 150ms ease-out;
}

.page-app-download .ad-group .panel__toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.page-app-download .ad-group .panel__body {
  padding-top: var(--space-2);
}

/* 对比表格 */
.page-app-download .ad-table-scroll {
  overflow-x: auto;
}

.page-app-download .ad-cap-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: var(--text-sm);
  line-height: 1.45;
  color: var(--color-ink);
}

.page-app-download .ad-cap-table thead th {
  padding: var(--space-3);
  text-align: left;
  vertical-align: bottom;
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
  border-top: 2px solid var(--color-ink);
  border-bottom: var(--border-thin) solid var(--color-line);
  white-space: nowrap;
}

.page-app-download .ad-cap-table th:first-child,
.page-app-download .ad-cap-table td:first-child {
  width: 20%;
  min-width: 168px;
}

.page-app-download .ad-cap-table th:last-child,
.page-app-download .ad-cap-table td:last-child {
  width: 26%;
  min-width: 210px;
}

.page-app-download .ad-cap-table tbody th {
  padding: var(--space-3);
  text-align: left;
  vertical-align: top;
  font-weight: 500;
  color: var(--color-ink);
}

.page-app-download .ad-cap-table tbody td {
  padding: var(--space-3);
  vertical-align: top;
  color: var(--color-ink-soft);
}

.page-app-download .ad-cap-table tbody tr:nth-child(even) {
  background: var(--color-surface-deep);
}

.page-app-download .ad-cap-table tbody tr {
  transition: background-color 140ms ease-out;
}

.page-app-download .ad-cap-table tbody tr:hover {
  background: var(--color-highlight);
}

.page-app-download .ad-cap-table .cap-full,
.page-app-download .ad-cap-table .cap-half {
  color: var(--color-ink);
}

/* 场景区块 */
.page-app-download .ad-scenes .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.page-app-download .ad-scenes .filter-btn {
  padding: var(--space-2) var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 150ms ease-out, background-color 150ms ease-out, color 150ms ease-out;
}

.page-app-download .ad-scenes .filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.page-app-download .ad-scenes .filter-btn[aria-pressed="true"] {
  background: var(--color-highlight);
  border-color: var(--color-accent);
  color: var(--color-ink);
}

.page-app-download .ad-scene-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.page-app-download .ad-scene {
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
}

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

.page-app-download .ad-scene__title {
  margin: var(--space-2) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.05em;
  color: var(--color-ink);
}

.page-app-download .ad-scene__body {
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-scene__pick {
  margin: var(--space-4) 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-app-download .ad-scene__pick span {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-accent);
}

/* 安装准备 */
.page-app-download .ad-prep__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-app-download .ad-prep__lead {
  max-width: var(--measure);
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-checklist {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  border-top: 2px solid var(--color-ink);
}

.page-app-download .ad-checklist__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-checklist__label {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: 0.08em;
  color: var(--color-ink);
}

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

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

.page-app-download .ad-checklist__rule {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink);
  padding-left: var(--space-3);
  border-left: 3px solid var(--color-primary-soft);
}

.page-app-download .ad-prep__figure {
  margin: 0;
}

.page-app-download .ad-prep__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-line);
}

/* 版本阶段 */
.page-app-download .ad-versions__lead {
  max-width: var(--measure);
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

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

.page-app-download .ad-stage {
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

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

.page-app-download .ad-stage__title {
  margin: var(--space-2) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.05em;
  color: var(--color-ink);
}

.page-app-download .ad-stage__body {
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-versions__figure {
  margin: var(--space-6) 0 0;
}

.page-app-download .ad-versions__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-line);
}

/* 选择建议与子页入口 */
.page-app-download .ad-choose__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}

.page-app-download .ad-choose__text .prose p {
  color: var(--color-ink-soft);
}

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

.page-app-download .ad-choose__text .prose a:hover {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent);
}

.page-app-download .ad-ios-card {
  display: block;
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  text-decoration: none;
  color: var(--color-ink);
  transition: transform 160ms ease-out, box-shadow 160ms ease-out, border-color 160ms ease-out;
}

.page-app-download .ad-ios-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  border-color: var(--color-primary);
}

.page-app-download .ad-ios-card__eyebrow {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

.page-app-download .ad-ios-card__title {
  margin: var(--space-2) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.05em;
  color: var(--color-ink);
}

.page-app-download .ad-ios-card__desc {
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-ios-card__topics {
  display: grid;
  gap: var(--space-2);
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
}

.page-app-download .ad-ios-card__topics li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-app-download .ad-ios-card__topics li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--color-primary-soft);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: 2px;
}

.page-app-download .ad-ios-card .link-arrow {
  display: inline-block;
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  width: 100%;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.page-app-download .ad-ios-card:hover .link-arrow {
  color: var(--color-focus);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-app-download .ad-ios-card,
  .page-app-download .ad-cap-table tbody tr,
  .page-app-download .ad-scenes .filter-btn,
  .page-app-download .ad-group .panel__toggle {
    transition: none;
  }
}

/* 中等屏 */
@media (min-width: 720px) {
  .page-app-download .ad-hero__cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-app-download .ad-checklist__item {
    grid-template-columns: minmax(0, 0.32fr) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-app-download .ad-compare__intro {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: var(--space-6);
    align-items: start;
  }

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

/* 桌面 */
@media (min-width: 1000px) {
  .page-app-download .ad-hero {
    padding: var(--space-8) 0;
  }

  .page-app-download .ad-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    gap: var(--space-8);
  }

  .page-app-download .ad-prep__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-app-download .ad-choose__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: var(--space-8);
  }
}
<<<END>>>