.page-app-download {
  --ad-frame: var(--color-primary);
  --ad-gap-card: var(--space-4);
  background: var(--color-surface);
  color: var(--color-ink);

  padding-top: var(--space-2);
  padding-bottom: var(--space-8);
}

/* ---------- 首屏 ---------- */

.page-app-download .ad-hero {
  padding-bottom: var(--section-y);
  background: var(--color-surface);
}

.page-app-download .crumbs__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-4);
  padding: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.page-app-download .crumbs__list a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) dotted var(--color-line);
}

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

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

.page-app-download .ad-hero__kicker {
  margin: 0 0 var(--space-3);
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.34em;
  color: var(--color-ink-muted);
}

.page-app-download .ad-hero__title {
  margin: 0 auto var(--space-4);
  max-width: 18ch;
  text-align: center;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 1.02;
  letter-spacing: calc(var(--tracking-heading) * 3);
  color: var(--color-ink);
}

.page-app-download .ad-hero__lede {
  margin: 0 auto var(--space-6);
  max-width: var(--measure);
  text-align: center;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-stage {
  display: grid;
  gap: var(--space-6);
  border-top: var(--border-thick) double var(--ad-frame);
  border-bottom: var(--border-thick) double var(--ad-frame);
  padding: var(--space-4) var(--space-2);
  background: var(--color-surface-alt);
}

.page-app-download .ad-tickets {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
}

.page-app-download .ad-ticket {
  flex: 1 1 auto;
  min-width: 9em;
  text-align: center;
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  transition: border-color 160ms ease, background-color 160ms ease, color 160ms ease;
}

.page-app-download .ad-ticket:hover,
.page-app-download .ad-ticket:focus-visible {
  border-color: var(--color-accent);
  background: var(--color-highlight);
  color: var(--color-accent);
  outline: none;
}

.page-app-download .ad-counts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
}

.page-app-download .ad-counts .stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  text-align: center;
}

.page-app-download .ad-counts .stat__value {
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  line-height: 1;
}

.page-app-download .ad-counts .stat__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

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

.page-app-download .ad-media {
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-deep);
  padding: var(--space-1);
  overflow: hidden;
}

.page-app-download .ad-media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-app-download .ad-media--wide img {
  aspect-ratio: 3 / 2;
}

.page-app-download .ad-media--tall img {
  aspect-ratio: 3 / 2;
}

.page-app-download .figure__caption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: var(--leading-body);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

/* ---------- 分组标题 ---------- */

.page-app-download .ad-group--alt {
  background: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

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

.page-app-download .ad-group__title {
  margin: 0;
  text-align: center;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-3xl);
  line-height: var(--leading-heading);
  letter-spacing: calc(var(--tracking-heading) * 4);
  color: var(--color-ink);
}

.page-app-download .ad-group__rule {
  height: 0;
  margin: var(--space-3) 0 var(--space-3);
  border: 0;
  border-bottom: var(--border-thin) dotted var(--color-line);
}

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

/* ---------- 项目卡 ---------- */

.page-app-download .ad-cards {
  display: grid;
  gap: var(--ad-gap-card);
  grid-template-columns: 1fr;
}

.page-app-download .ad-card {
  position: relative;
  padding: var(--space-4) var(--space-3) var(--space-3);
  background: var(--color-surface);
  overflow: hidden;
  transition: border-color 160ms ease, background-color 160ms ease;
}

.page-app-download .ad-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: var(--space-6);
  height: var(--space-1);
  background: var(--color-primary);
}

.page-app-download .ad-card:hover,
.page-app-download .ad-card:focus-within {
  border-color: var(--color-accent);
  background: var(--color-primary-soft);
}

.page-app-download .ad-card:hover::before,
.page-app-download .ad-card:focus-within::before {
  background: var(--color-accent);
}

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

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

.page-app-download .ad-card__meta dt {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-primary);
}

.page-app-download .ad-card__meta dd {
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-card__tag {
  display: inline-block;
  margin: 0 0 var(--space-2);
  font-size: var(--text-xs);
}

.page-app-download .ad-meter {
  height: var(--space-1);
  margin: 0 0 var(--space-2);
  background: var(--color-surface-deep);
  border-left: var(--border-thin) solid var(--color-line);
  border-right: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-meter__fill {
  display: block;
  height: 100%;
  background: var(--color-accent);
}

.page-app-download .ad-meter__fill--s {
  width: 38%;
}

.page-app-download .ad-meter__fill--m {
  width: 66%;
}

.page-app-download .ad-meter__fill--l {
  width: 100%;
}

.page-app-download .ad-figure {
  margin: var(--space-6) auto 0;
  max-width: 100%;
}

/* ---------- 准备清单 ---------- */

.page-app-download .ad-checklist {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  margin: 0 auto;
  padding: 0;
  max-width: 62rem;
}

.page-app-download .ad-check {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thick) solid var(--color-primary);
  background: var(--color-surface);
  transition: border-color 160ms ease, background-color 160ms ease;
}

.page-app-download .ad-check:hover,
.page-app-download .ad-check:focus-visible {
  border-color: var(--color-accent);
  background: var(--color-highlight);
  outline: none;
}

.page-app-download .ad-check__box {
  position: relative;
  flex: 0 0 auto;
  width: var(--space-3);
  height: var(--space-3);
  margin-top: var(--space-1);
  border: var(--border-thin) solid var(--color-primary);
  background: var(--color-surface-alt);
}

.page-app-download .ad-check:hover .ad-check__box::after,
.page-app-download .ad-check:focus-visible .ad-check__box::after {
  content: "";
  position: absolute;
  inset: 22%;
  background: var(--color-accent);
}

.page-app-download .ad-check__name {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  letter-spacing: calc(var(--tracking-heading) * 2);
  color: var(--color-ink);
}

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

/* ---------- 提醒与同步 ---------- */

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

.page-app-download .ad-note {
  padding: var(--space-4) var(--space-3);
  background: var(--color-surface);
}

.page-app-download .ad-note__tag {
  display: inline-block;
  margin: 0 0 var(--space-2);
  font-size: var(--text-xs);
}

.page-app-download .ad-note__name {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: calc(var(--tracking-heading) * 2);
  color: var(--color-ink);
}

.page-app-download .ad-note__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-app-download .ad-note__list li {
  padding: var(--space-2) 0;
  border-top: var(--border-thin) dotted var(--color-line);
}

.page-app-download .ad-note__key {
  display: inline-block;
  margin-bottom: var(--space-1);
  padding: 0 var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-accent-ink);
  background: var(--color-accent);
}

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

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

/* ---------- 收尾建议 ---------- */

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

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

.page-app-download .ad-final__title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-3xl);
  line-height: var(--leading-heading);
  letter-spacing: calc(var(--tracking-heading) * 3);
  color: var(--color-ink);
  text-align: center;
}

.page-app-download .ad-final__lede {
  margin: 0 0 var(--space-4);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  text-align: center;
}

.page-app-download .ad-exits {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-1);
  border-top: var(--border-thick) double var(--ad-frame);
  padding-top: var(--space-3);
}

.page-app-download .ad-exits li {
  padding: var(--space-2) 0 var(--space-2) var(--space-3);
  border-bottom: var(--border-thin) dotted var(--color-line);
  border-left: var(--border-thin) solid var(--color-primary);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-exits a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-accent);
  padding-bottom: 1px;
}

.page-app-download .ad-exits a:hover,
.page-app-download .ad-exits a:focus-visible {
  color: var(--color-accent);
  outline: none;
}

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

/* ---------- 焦点反馈 ---------- */

.page-app-download a:focus-visible,
.page-app-download [tabindex="0"]:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-app-download .ad-stage {
    padding: var(--space-6) var(--space-4);
  }

  .page-app-download .ad-ticket--a {
    flex: 0 0 24%;
  }

  .page-app-download .ad-ticket--b {
    flex: 0 0 32%;
    transform: translateY(calc(-1 * var(--space-1)));
  }

  .page-app-download .ad-ticket--c {
    flex: 0 0 39%;
  }

  .page-app-download .ad-cards--2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-app-download .ad-figure {
    max-width: 74%;
    margin-left: auto;
    margin-right: auto;
  }

  .page-app-download .ad-final__title,
  .page-app-download .ad-final__lede {
    text-align: left;
  }
}

@media (min-width: 901px) {
  .page-app-download .ad-hero__figure {
    width: 64%;
    margin-left: auto;
    margin-right: 0;
  }

  .page-app-download .ad-stage {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
    gap: var(--space-4);
  }

  .page-app-download .ad-counts {
    justify-content: flex-end;
  }

  .page-app-download .ad-counts .stat:nth-child(1) {
    margin-top: var(--space-4);
  }

  .page-app-download .ad-counts .stat:nth-child(3) {
    margin-top: calc(-1 * var(--space-2));
  }

  .page-app-download .ad-cards--3 {
    grid-template-columns: 1.12fr 0.94fr 1.06fr;
    align-items: start;
  }

  .page-app-download .ad-cards--3 > .ad-card:nth-child(2) {
    margin-top: var(--space-4);
  }

  .page-app-download .ad-checklist {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-app-download .ad-notify__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: var(--space-6);
  }

  .page-app-download .ad-final__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
    gap: var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-app-download .ad-card,
  .page-app-download .ad-ticket,
  .page-app-download .ad-check {
    transition: none;
  }
}
<<<END>>>