.page-app-download {
  --ad-rule: var(--border-thin) solid var(--color-line);
  --ad-rule-deep: var(--border-thin) solid var(--color-contrast-line);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-app-download .ad-wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.page-app-download h2 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-2);
}

.page-app-download h3 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  margin: 0 0 var(--space-1);
}

.page-app-download p {
  margin: 0;
}

.page-app-download .ad-intro {
  max-width: var(--measure);
  margin-bottom: var(--space-6);
}

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

/* ---------- 面包屑 ---------- */
.page-app-download .ad-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  border-bottom: var(--ad-rule);
}

.page-app-download .ad-crumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 160ms linear;
}

.page-app-download .ad-crumb a:hover,
.page-app-download .ad-crumb a:focus-visible {
  color: var(--color-primary);
}

.page-app-download .ad-crumb__sep {
  color: var(--color-ink-muted);
}

.page-app-download .ad-crumb__cur {
  color: var(--color-ink);
}

/* ---------- 首屏分屏 ---------- */
.page-app-download .ad-hero {
  display: grid;
  grid-template-columns: 1fr;
  border-bottom: var(--ad-rule);
}

.page-app-download .ad-hero__pane {
  position: relative;
  overflow: hidden;
}

.page-app-download .ad-hero__pane--deep {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-8) var(--space-3);
}

.page-app-download .ad-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.page-app-download .ad-hero__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  opacity: 0.78;
}

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

.page-app-download .ad-hero__title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.03;
  letter-spacing: -0.012em;
  color: var(--color-contrast-ink);
  margin: var(--space-3) 0 var(--space-3);
  max-width: 7em;
}

.page-app-download .ad-hero__lead {
  max-width: 36ch;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-contrast-ink);
  opacity: 0.82;
}

.page-app-download .ad-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-4);
}

.page-app-download .ad-badge {
  appearance: none;
  -webkit-appearance: none;
  border: var(--ad-rule-deep);
  border-radius: var(--radius-sm);
  background-color: transparent;
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  padding: calc(var(--space-1) * 0.9) var(--space-2);
  cursor: pointer;
  transition: background-color 180ms linear, color 180ms linear, border-color 180ms linear;
}

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

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

.page-app-download .ad-badge[aria-pressed="true"] {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-app-download .ad-hero__pane--light {
  background-color: var(--color-surface);
  color: var(--color-ink);
  padding: var(--space-6) var(--space-3);
  display: flex;
  align-items: center;
}

.page-app-download .ad-figures {
  width: 100%;
  display: grid;
  gap: var(--space-4);
}

.page-app-download .ad-figure {
  border-top: var(--border-thick) solid var(--color-primary);
  padding-top: var(--space-2);
}

.page-app-download .ad-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}

.page-app-download .ad-figure__key {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-app-download .ad-figure__note {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--color-ink-muted);
  max-width: 30ch;
}

/* ---------- 通用区块 / 深色带 ---------- */
.page-app-download .ad-section {
  padding-block: var(--section-y);
}

.page-app-download .ad-band {
  position: relative;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-app-download .ad-band__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.page-app-download .ad-band__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  opacity: 0.82;
}

.page-app-download .ad-band__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-6) var(--space-3);
}

.page-app-download .ad-band h2 {
  color: var(--color-contrast-ink);
}

.page-app-download .ad-band__note {
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-contrast-ink);
  opacity: 0.84;
}

/* ---------- 版本线 ---------- */
.page-app-download .ad-lines__body {
  padding-block: var(--space-8);
}

.page-app-download .ad-lines__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-app-download .ad-line {
  border: var(--ad-rule);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  transition: border-color 180ms linear;
}

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

.page-app-download .ad-line__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding-bottom: var(--space-3);
}

.page-app-download .ad-line__mark {
  flex: none;
  width: var(--space-2);
  height: var(--space-2);
  background-color: var(--color-primary);
}

.page-app-download .ad-line__name {
  flex: 1 1 auto;
  font-size: var(--text-lg);
  margin: 0;
}

.page-app-download .ad-line__badge {
  flex: none;
}

.page-app-download .ad-line__specs {
  margin: 0;
  padding-top: var(--space-3);
  border-top: var(--ad-rule);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-app-download .ad-line__specs > div {
  min-width: 0;
}

.page-app-download .ad-line__spec dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}

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

.page-app-download [data-filter-item][hidden] {
  display: none;
}

/* ---------- 设备适配 ---------- */
.page-app-download .ad-device__list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-app-download .ad-device__item {
  position: relative;
  border: var(--ad-rule);
  border-left: var(--border-thick) solid var(--color-accent);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-alt);
  padding: var(--space-4) var(--space-3);
  transition: background-color 180ms linear, border-left-color 180ms linear;
}

.page-app-download .ad-device__item:hover,
.page-app-download .ad-device__item:focus-within {
  background-color: var(--color-highlight);
  border-left-color: var(--color-primary);
}

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

.page-app-download .ad-device__icon {
  display: block;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-2);
}

.page-app-download .ad-device__item:hover .ad-device__icon,
.page-app-download .ad-device__item:focus-within .ad-device__icon {
  color: var(--color-accent);
}

.page-app-download .ad-device__name {
  font-size: var(--text-lg);
}

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

.page-app-download .ad-device__tip {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: var(--ad-rule);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-primary);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 180ms linear, max-height 180ms linear;
}

.page-app-download .ad-device__item:hover .ad-device__tip,
.page-app-download .ad-device__item:focus-within .ad-device__tip {
  opacity: 1;
  max-height: calc(var(--space-8) * 1.5);
}

/* ---------- 安装准备 ---------- */
.page-app-download .ad-prep {
  background-color: var(--color-surface-alt);
}

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

.page-app-download .ad-prep__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1 / 1;
  max-height: 420px;
  background-color: var(--color-contrast-surface);
  display: flex;
  align-items: flex-end;
  border-radius: var(--radius-sm);
}

.page-app-download .ad-prep__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.page-app-download .ad-prep__caption {
  position: relative;
  z-index: 1;
  padding: var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  line-height: 1.6;
  color: var(--color-contrast-ink);
}

.page-app-download .ad-prep__lead {
  max-width: 46ch;
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-app-download .ad-checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--ad-rule);
}

.page-app-download .ad-checklist__item {
  border-bottom: var(--ad-rule);
}

.page-app-download .ad-checklist__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-app-download .ad-checklist__label {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  cursor: pointer;
}

.page-app-download .ad-checklist__box {
  position: relative;
  flex: none;
  width: var(--space-2);
  height: var(--space-2);
  margin-top: calc(var(--space-1) * 0.45);
  border: var(--border-thin) solid var(--color-ink-muted);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  transition: background-color 160ms linear, border-color 160ms linear;
}

.page-app-download .ad-checklist__input:checked + .ad-checklist__label .ad-checklist__box {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

.page-app-download .ad-checklist__input:checked + .ad-checklist__label .ad-checklist__box::after {
  content: "";
  position: absolute;
  left: 32%;
  top: 12%;
  width: 30%;
  height: 56%;
  border-right: var(--border-thick) solid var(--color-primary-ink);
  border-bottom: var(--border-thick) solid var(--color-primary-ink);
  transform: rotate(42deg);
  transform-origin: center;
}

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

.page-app-download .ad-checklist__input:checked + .ad-checklist__label .ad-checklist__title {
  color: var(--color-ink-muted);
  text-decoration: line-through;
}

.page-app-download .ad-checklist__text {
  display: block;
  min-width: 0;
}

.page-app-download .ad-checklist__title {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: 1.4;
  color: var(--color-ink);
  transition: color 160ms linear;
}

.page-app-download .ad-checklist__desc {
  display: block;
  margin-top: calc(var(--space-1) * 0.5);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* ---------- 搭配建议 ---------- */
.page-app-download .ad-combo__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-app-download .ad-combo__item {
  border: var(--ad-rule);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  padding: var(--space-3);
}

.page-app-download .ad-combo__pair {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.4;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.page-app-download .ad-combo__pair span {
  color: var(--color-ink-muted);
  padding-inline: calc(var(--space-1) * 0.5);
}

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

/* ---------- 装好之后 ---------- */
.page-app-download .ad-after {
  background-color: var(--color-surface);
}

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

.page-app-download .ad-after__item {
  border-top: var(--border-thick) solid var(--color-accent);
  padding-top: var(--space-3);
}

.page-app-download .ad-after__item h3 {
  font-size: var(--text-lg);
}

.page-app-download .ad-after__item p {
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-app-download .ad-after__link {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.page-app-download .ad-after__link a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-accent);
  padding-bottom: 2px;
  transition: color 160ms linear, border-color 160ms linear;
}

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

/* ---------- 出口 ---------- */
.page-app-download .ad-outro {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-app-download .ad-outro__inner {
  padding-block: var(--section-y);
  max-width: var(--container);
}

.page-app-download .ad-outro h2 {
  color: var(--color-contrast-ink);
  max-width: 22ch;
}

.page-app-download .ad-outro p {
  max-width: 56ch;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-contrast-ink);
  opacity: 0.84;
}

.page-app-download .ad-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.page-app-download .ad-outro .btn--ghost {
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

.page-app-download .ad-outro .btn--ghost:hover {
  color: var(--color-contrast-surface);
  background-color: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
}

/* ---------- 图片统一约束 ---------- */
.page-app-download img {
  max-width: 100%;
  height: auto;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-app-download .ad-device__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 768px) {
  .page-app-download .ad-section {
    padding-block: var(--section-y-lg);
  }

  .page-app-download .ad-wrap {
    padding-inline: var(--space-4);
  }

  .page-app-download .ad-band__inner {
    padding-inline: var(--space-4);
  }

  .page-app-download .ad-hero__pane--deep,
  .page-app-download .ad-hero__pane--light {
    padding-inline: var(--space-6);
  }

  .page-app-download .ad-hero__pane--deep {
    padding-block: var(--space-8);
  }

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

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

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

@media (min-width: 960px) {
  .page-app-download .ad-hero {
    grid-template-columns: 1fr 1fr;
  }

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

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

  .page-app-download .ad-figures {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: var(--space-3);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-app-download * {
    transition-duration: 0.01ms !important;
  }
}