.page-app-download {
  --ad-rail: 52px;
  --ad-gap: var(--space-2);
  display: block;
  background: var(--color-surface);
  color: var(--color-ink);
}

.page-app-download .breadcrumb {
  padding-block: var(--space-3);
}

/* ---------- 首屏 ---------- */

.page-app-download .ad-hero {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--space-6) var(--space-4);
  overflow: hidden;
}

.page-app-download .ad-hero__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  box-sizing: border-box;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-app-download .ad-hero__kicker {
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-contrast-ink);
  opacity: 0.68;
}

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

.page-app-download .ad-hero__sub {
  margin: var(--space-2) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
}

.page-app-download .ad-hero__lede {
  margin: var(--space-4) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.9;
}

.page-app-download .ad-hero__figure {
  position: relative;
  margin: 0;
}

.page-app-download .ad-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-sm);
  filter: grayscale(1) contrast(1.08);
}

.page-app-download .ad-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-primary);
  opacity: 0.3;
  mix-blend-mode: multiply;
  pointer-events: none;
  border-radius: var(--radius-sm);
}

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

.page-app-download .ad-stat__label {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
  opacity: 0.7;
}

.page-app-download .ad-stat__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-ink);
}

.page-app-download .ad-stat__unit {
  margin-left: 0.3em;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-contrast-accent);
}

/* ---------- 序号色块列 ---------- */

.page-app-download .ad-digits-wrap {
  max-width: var(--container);
  margin: var(--space-6) auto 0;
  padding-inline: var(--gutter);
  box-sizing: border-box;
}

.page-app-download .ad-digits {
  display: flex;
  gap: var(--space-1);
  margin: 0;
  padding: 0 0 var(--space-1);
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-app-download .ad-digits__item {
  flex: 1 1 0;
  min-width: 62px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-block: var(--space-2);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  clip-path: polygon(0 0, 100% 0, 100% 84%, 0 100%);
}

.page-app-download .ad-digits__item:nth-child(even) {
  background: transparent;
  color: var(--color-contrast-ink);
  box-shadow: inset 0 0 0 var(--border-thin) var(--color-contrast-line);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 84%);
}

.page-app-download .ad-digits__num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1;
}

/* ---------- 横向步骤条 ---------- */

.page-app-download .ad-stepbar {
  max-width: var(--container);
  margin: var(--space-3) auto 0;
  padding-inline: var(--gutter);
  box-sizing: border-box;
}

.page-app-download .ad-stepbar__list {
  display: flex;
  gap: var(--space-1);
  margin: 0;
  padding: var(--space-3) 0 var(--space-1);
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  border-top: 1px dotted var(--color-contrast-line);
}

.page-app-download .ad-stepbar__link {
  display: block;
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  white-space: nowrap;
  color: var(--color-contrast-ink);
  text-decoration: none;
  transition: background-color 140ms linear, border-color 140ms linear, color 140ms linear;
}

.page-app-download .ad-stepbar__link:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

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

/* ---------- 步骤分组 ---------- */

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

.page-app-download .ad-group + .ad-group {
  border-top: 1px dotted var(--color-line);
}

.page-app-download .ad-group__kicker {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

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

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

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

/* ---------- 单个步骤 ---------- */

.page-app-download .ad-step {
  display: grid;
  grid-template-columns: var(--ad-rail) minmax(0, 1fr);
  column-gap: var(--ad-gap);
}

.page-app-download .ad-group--prep .ad-step,
.page-app-download .ad-group--version .ad-step {
  padding-block: var(--space-4);
}

.page-app-download .ad-group--setup .ad-step {
  padding-block: var(--space-3);
}

.page-app-download .ad-group--sub .ad-step {
  padding-block: var(--space-2);
}

.page-app-download .ad-step__rail {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.page-app-download .ad-step__rail::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  border-left: 1px dotted var(--color-line);
}

.page-app-download .ad-step__num {
  position: relative;
  z-index: 1;
  display: block;
  width: calc(var(--ad-rail) - var(--space-1));
  padding-block: var(--space-1);
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  clip-path: polygon(0 0, 100% 0, 100% 82%, 0 100%);
}

.page-app-download .ad-step:nth-child(3n+2) .ad-step__num {
  background: var(--color-primary-soft);
  color: var(--color-ink);
}

.page-app-download .ad-step:nth-child(3n+3) .ad-step__num {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-app-download .ad-step__main {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.page-app-download .ad-step__title {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.25;
  letter-spacing: var(--tracking-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-underline-offset: 3px;
}

.page-app-download .ad-step__text a:hover {
  color: var(--color-accent);
}

.page-app-download .ad-step__notice {
  margin: 0;
  padding-left: var(--space-2);
  border-left: var(--border-thick) solid var(--color-accent);
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink-muted);
}

.page-app-download .ad-step__result {
  margin: 0;
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-alt);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink-soft);
}

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

/* ---------- 版本对比小列表 ---------- */

.page-app-download .ad-compare {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-1);
}

.page-app-download .ad-compare__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-1);
  padding: var(--space-2);
  background: var(--color-primary-soft);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink-soft);
}

.page-app-download .ad-compare__key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

/* ---------- 图片 ---------- */

.page-app-download .ad-figure {
  margin: var(--space-3) 0 var(--space-4);
}

.page-app-download .ad-figure__frame {
  position: relative;
}

.page-app-download .ad-figure__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: var(--radius-sm);
  filter: grayscale(1) contrast(1.06);
}

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

.page-app-download .ad-figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--color-primary);
  opacity: 0.24;
  mix-blend-mode: multiply;
  pointer-events: none;
  border-radius: var(--radius-sm);
}

.page-app-download .ad-figure__caption {
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

/* ---------- 相邻主题 ---------- */

.page-app-download .ad-next {
  padding-block: var(--section-y);
  background: var(--color-primary-soft);
  border-top: 1px dotted var(--color-line);
}

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

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

.page-app-download .ad-next__list {
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-1);
}

.page-app-download .ad-next__link {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-3);
  background: var(--color-surface);
  border-left: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--color-ink);
  transition: border-color 140ms linear, transform 140ms linear;
}

.page-app-download .ad-next__link:hover {
  border-left-color: var(--color-accent);
  transform: translateX(4px);
}

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

.page-app-download .ad-next__label {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  letter-spacing: var(--tracking-heading);
}

.page-app-download .ad-next__desc {
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink-muted);
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-app-download .ad-stat__value {
    font-size: var(--text-2xl);
  }

  .page-app-download .ad-compare__row {
    grid-template-columns: 8ch minmax(0, 1fr);
    align-items: baseline;
  }

  .page-app-download .ad-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
  }

  .page-app-download .ad-next__link {
    grid-template-columns: minmax(0, 1fr);
    padding: var(--space-4);
  }
}

@media (min-width: 900px) {
  .page-app-download {
    --ad-rail: 88px;
    --ad-gap: var(--space-4);
  }

  .page-app-download .ad-hero {
    padding-block: var(--section-y) var(--space-6);
  }

  .page-app-download .ad-hero__inner {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--gutter);
    row-gap: var(--space-6);
  }

  .page-app-download .ad-hero__lead {
    grid-column: 1 / span 7;
  }

  .page-app-download .ad-hero__figure {
    grid-column: 8 / span 5;
    align-self: end;
  }

  .page-app-download .ad-hero__stats {
    grid-column: 1 / -1;
  }

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

  .page-app-download .ad-group__steps {
    margin-top: var(--space-8);
  }

  .page-app-download .ad-step {
    column-gap: var(--space-4);
  }

  .page-app-download .ad-group--prep .ad-step {
    padding-block: var(--space-6);
  }

  .page-app-download .ad-group--version .ad-step {
    padding-block: var(--space-4);
  }

  .page-app-download .ad-group--setup .ad-step {
    padding-block: var(--space-3);
  }

  .page-app-download .ad-group--sub .ad-step {
    padding-block: var(--space-2);
  }

  .page-app-download .ad-figure {
    padding-left: calc(var(--ad-rail) + var(--space-4));
    margin-block: var(--space-4) var(--space-6);
  }

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

  .page-app-download .ad-next__item:first-child {
    grid-column: span 2;
  }
}

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