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

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

.page-app-download .ad-link {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: var(--border-thin);
  text-underline-offset: 3px;
}

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

/* ---------- 首屏 ---------- */
.page-app-download .ad-hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-8) var(--space-8);
  background-color: var(--color-contrast-surface);
  isolation: isolate;
}

.page-app-download .ad-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.page-app-download .ad-hero__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-app-download .ad-hero__inner {
  position: relative;
  z-index: 1;
  color: var(--color-contrast-ink);
}

.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;
}

.page-app-download .breadcrumb li {
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.page-app-download .breadcrumb li + li::before {
  content: "/";
  margin-right: var(--space-1);
  opacity: 0.55;
}

.page-app-download .breadcrumb a {
  color: inherit;
  text-decoration: none;
}

.page-app-download .ad-hero__eyebrow {
  margin: 0 0 var(--space-2);
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

.page-app-download .ad-hero__title {
  margin: 0 0 var(--space-3);
  color: var(--color-contrast-ink);
  line-height: 1.02;
}

.page-app-download .ad-hero__lede {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

/* 三层玻璃面板 */
.page-app-download .ad-stack {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-3);
}

.page-app-download .ad-stack__card {
  position: relative;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-surface) 58%, transparent);
  background-color: color-mix(in srgb, var(--color-surface) 82%, transparent);
  box-shadow: var(--shadow-1);
  color: var(--color-ink);
  transition: transform 240ms var(--ease-out), box-shadow 240ms var(--ease-out);
}

.page-app-download .ad-stack__card--chart {
  z-index: 2;
  background-color: color-mix(in srgb, var(--color-surface) 88%, transparent);
}

.page-app-download .ad-stack__card--offline {
  z-index: 3;
  border-radius: var(--radius-lg);
  background-color: color-mix(in srgb, var(--color-surface) 95%, transparent);
  box-shadow: var(--shadow-2);
}

.page-app-download .ad-stack__idx {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

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

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

.page-app-download .ad-stack__nums {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  margin: 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-variant-numeric: tabular-nums;
}

.page-app-download .ad-stack__num {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

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

.page-app-download .ad-stack__vol {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

@media (hover: hover) {
  .page-app-download .ad-stack__card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-2);
  }
}

/* ---------- 分组带 ---------- */
.page-app-download .ad-band {
  display: grid;
  gap: var(--space-2);
}

.page-app-download .ad-band__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background-color: color-mix(in srgb, var(--color-surface) 92%, transparent);
  color: inherit;
  text-decoration: none;
  transition: border-color 160ms var(--ease-out), background-color 160ms var(--ease-out);
}

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

.page-app-download .ad-band__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

.page-app-download .ad-band__name {
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-app-download .ad-band__desc {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* ---------- 步骤清单 ---------- */
.page-app-download .ad-group-head {
  display: block;
  margin: var(--space-6) 0 var(--space-4);
  padding-left: var(--space-2);
  border-left: 2px solid var(--color-accent);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-primary);
}

.page-app-download .ad-group-head:first-of-type {
  margin-top: var(--space-4);
}

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

.page-app-download .ad-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: var(--space-2);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-step__num {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.page-app-download .ad-step__body {
  min-width: 0;
}

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

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

.page-app-download .ad-step__meta {
  display: grid;
  gap: var(--space-2);
  margin: 0;
}

.page-app-download .ad-step__meta > div {
  padding-left: var(--space-2);
  border-left: 2px solid var(--color-primary-soft);
}

.page-app-download .ad-step__meta dt {
  margin-bottom: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-app-download .ad-step__meta dd {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* ---------- 中段留白面板 ---------- */
.page-app-download .ad-breath {
  padding-block: var(--section-y-lg);
}

.page-app-download .ad-breath__panel {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 200px;
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 22%, transparent);
  background-color: color-mix(in srgb, var(--color-primary-soft) 44%, transparent);
  background-image: repeating-linear-gradient(
    90deg,
    color-mix(in srgb, var(--color-primary) 12%, transparent) 0 1px,
    transparent 1px 64px
  );
  box-shadow: var(--shadow-1);
}

.page-app-download .ad-breath__tick {
  width: 1px;
  height: 44px;
  background-color: var(--color-accent);
}

.page-app-download .ad-breath__hint {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

/* ---------- 版本对照 ---------- */
.page-app-download .ad-compare__caption {
  padding-bottom: var(--space-2);
  text-align: left;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-app-download .ad-compare .data-table thead th {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-line);
}

.page-app-download .ad-compare .data-table tbody th {
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-app-download .ad-compare .data-table td {
  font-variant-numeric: tabular-nums;
}

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

.page-app-download .ad-compare__strip {
  margin: var(--space-4) 0 0;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  overflow: hidden;
}

.page-app-download .ad-compare__strip img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1400 / 320;
  object-fit: cover;
}

/* ---------- 安装准备 ---------- */
.page-app-download .ad-prep__grid {
  display: grid;
  gap: var(--space-4);
}

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

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

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

.page-app-download .ad-checklist__item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-checklist__box {
  position: relative;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  border: var(--border-thin) solid var(--color-primary);
  border-radius: 3px;
}

.page-app-download .ad-checklist__box::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 1px;
  background-color: var(--color-accent);
}

.page-app-download .ad-checklist__name {
  margin: 0 0 var(--space-1);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-app-download .ad-checklist__desc {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* ---------- 常见问题收束 ---------- */
.page-app-download .ad-faq {
  position: relative;
  overflow: hidden;
  padding-block: var(--section-y);
  background-color: var(--color-contrast-surface);
}

.page-app-download .ad-faq__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.page-app-download .ad-faq__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-app-download .ad-faq__inner {
  position: relative;
  z-index: 1;
}

.page-app-download .ad-faq__title {
  margin: 0 0 var(--space-4);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-app-download .ad-faq__list {
  display: grid;
  gap: var(--space-3);
}

.page-app-download .ad-faq__item {
  max-width: var(--measure);
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-contrast-line);
}

.page-app-download .ad-faq__q {
  margin: 0 0 var(--space-1);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-app-download .ad-faq__a {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-app-download .ad-band {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-app-download .ad-step {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: var(--space-4);
  }

  .page-app-download .ad-step__num {
    font-size: var(--text-4xl);
  }

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

  .page-app-download .ad-faq__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3) var(--space-4);
  }
}

@media (min-width: 1024px) {
  .page-app-download .ad-hero {
    padding-block: var(--space-8) var(--section-y);
  }

  .page-app-download .ad-stack {
    display: flex;
    align-items: flex-start;
    gap: 0;
    margin-top: var(--space-8);
  }

  .page-app-download .ad-stack__card {
    flex: 1 1 0;
    min-width: 0;
    padding: var(--space-3);
    backdrop-filter: blur(14px);
  }

  .page-app-download .ad-stack__card--base {
    margin-top: 0;
  }

  .page-app-download .ad-stack__card--chart {
    margin-top: var(--space-4);
    margin-left: calc(var(--space-3) * -1);
  }

  .page-app-download .ad-stack__card--offline {
    margin-top: var(--space-8);
    margin-left: calc(var(--space-3) * -1);
  }

  .page-app-download .ad-prep__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-6);
    align-items: start;
  }

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

@media (min-width: 1180px) {
  .page-app-download .ad-stack__card {
    padding: var(--space-4);
  }

  .page-app-download .ad-breath__panel {
    min-height: 240px;
    padding: var(--space-4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-app-download .ad-stack__card,
  .page-app-download .ad-band__item {
    transition: none;
  }

  .page-app-download .ad-stack__card:hover {
    transform: none;
  }
}