.page-app-download {
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
}

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

/* ---------- 面包屑 ---------- */
.page-app-download .breadcrumb {
  padding-block: var(--space-3) var(--space-2);
}

.page-app-download .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

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

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

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

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

/* ---------- 首屏 ---------- */
.page-app-download .ad-hero {
  padding-bottom: var(--section-y);
}

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

.page-app-download .ad-idx {
  border-top: var(--border-thin) solid var(--color-line);
  padding-top: var(--space-2);
}

.page-app-download .ad-idx__label {
  margin: 0 0 var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}

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

.page-app-download .ad-idx__list a {
  display: block;
  padding: 2px var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.4;
  color: var(--color-ink-muted);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-variant-numeric: tabular-nums;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.page-app-download .ad-idx__list a:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

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

.page-app-download .ad-hero__body {
  display: grid;
  gap: var(--space-3);
  min-width: 0;
}

.page-app-download .ad-tagband {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: 0;
  padding: 0 0 var(--space-2);
  list-style: none;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-tagband__item {
  padding: 3px var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
  background-color: var(--color-primary-soft);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  transform: rotate(-1.5deg);
  transition: transform 0.2s ease;
}

.page-app-download .ad-tagband__item:nth-child(even) {
  background-color: var(--color-highlight);
  transform: rotate(1.2deg);
}

.page-app-download .ad-tagband__item:hover {
  transform: rotate(0deg);
}

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

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

.page-app-download .ad-hero__blocks {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.page-app-download .ad-block {
  position: relative;
  display: grid;
  gap: var(--space-2);
  align-content: start;
  padding: var(--space-3);
}

.page-app-download .ad-block .sticker--corner {
  position: absolute;
  top: calc(var(--space-2) * -1);
  right: var(--space-3);
}

.page-app-download .ad-block__media {
  width: 100%;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: var(--space-1);
}

.page-app-download .ad-block__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.05);
}

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

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

.page-app-download .ad-tick 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-tick li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: var(--space-2);
  height: var(--border-thin);
  background-color: var(--color-primary);
}

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

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

.page-app-download .ad-stats dt {
  margin-bottom: 2px;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.page-app-download .ad-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1.1;
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}

.page-app-download .ad-stats__item--accent dd {
  color: var(--color-accent);
}

/* ---------- 目录索引 ---------- */
.page-app-download .ad-dir__head {
  max-width: var(--measure);
}

.page-app-download .ad-dir__lede,
.page-app-download .ad-prep__lede,
.page-app-download .ad-device__lede,
.page-app-download .ad-first__lede,
.page-app-download .ad-next__lede {
  margin-top: var(--space-2);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin: var(--space-4) 0 var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-cat {
  appearance: none;
  cursor: pointer;
  padding: 4px var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  transform: rotate(-1deg);
  transition: transform 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.page-app-download .ad-cat:hover {
  transform: rotate(0deg);
  background-color: var(--color-primary-soft);
}

.page-app-download .ad-cat.is-active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
  transform: rotate(0deg);
}

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

.page-app-download .ad-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-entry {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-1) var(--space-2);
  padding: var(--space-3) 0 var(--space-3) var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  scroll-margin-top: var(--space-8);
}

.page-app-download .ad-entry::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--space-2);
  bottom: var(--space-2);
  width: 2px;
  background-color: transparent;
  transition: background-color 0.2s ease;
}

.page-app-download .ad-entry:hover::before,
.page-app-download .ad-entry:target::before {
  background-color: var(--color-primary);
}

.page-app-download .ad-entry__num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  line-height: 1.1;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

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

.page-app-download .ad-entry__title {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

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

.page-app-download .ad-entry__cat {
  grid-column: 2;
  justify-self: start;
  align-self: start;
  padding: 2px var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  background-color: var(--color-primary-soft);
  border-radius: var(--radius-sm);
  transform: rotate(-1.5deg);
  transition: transform 0.18s ease;
}

.page-app-download .ad-entry:hover .ad-entry__cat {
  transform: rotate(0deg);
}

/* ---------- 设备与系统 ---------- */
.page-app-download .ad-device__layout {
  display: grid;
  gap: var(--space-4);
}

.page-app-download .ad-device__list {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

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

.page-app-download .ad-device__item svg {
  display: block;
  margin-bottom: var(--space-1);
}

.page-app-download .ad-device__item h3 {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-app-download .ad-device__item p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

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

.page-app-download .ad-device__figure img,
.page-app-download .ad-prep__figure img,
.page-app-download .ad-first__banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.05);
}

.page-app-download .ad-device__figure figcaption,
.page-app-download .ad-prep__figure figcaption {
  margin-top: var(--space-1);
}

/* ---------- 安装准备 ---------- */
.page-app-download .ad-prep__head {
  max-width: var(--measure);
}

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

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

.page-app-download .ad-checklist li {
  display: grid;
  grid-template-columns: auto 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 li::before {
  content: "";
  width: var(--space-1);
  height: var(--space-1);
  margin-top: 0.6em;
  background-color: var(--color-primary-soft);
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-sm);
}

.page-app-download .ad-checklist li span {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

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

.page-app-download .ad-trouble {
  margin-top: var(--space-4);
  padding: var(--space-3);
  background-color: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
}

.page-app-download .ad-trouble h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

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

.page-app-download .ad-trouble__list li {
  padding-left: var(--space-3);
  position: relative;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-app-download .ad-trouble__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: var(--space-1);
  height: var(--border-thin);
  background-color: var(--color-primary);
}

.page-app-download .ad-trouble__list strong {
  color: var(--color-ink);
  font-weight: 600;
}

/* ---------- 首次进入 ---------- */
.page-app-download .ad-first__banner {
  margin: 0 0 var(--space-4);
}

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

.page-app-download .ad-steps {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2);
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
  counter-increment: ad-step;
}

.page-app-download .ad-steps {
  counter-reset: ad-step;
}

.page-app-download .ad-steps li::before {
  content: counter(ad-step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-app-download .ad-steps li span {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* ---------- 常见疑问 ---------- */
.page-app-download .ad-faq__head {
  max-width: var(--measure);
}

.page-app-download .ad-faq__list {
  margin: var(--space-4) 0 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-faq__item {
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-faq__item dt {
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

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

/* ---------- 下一步 ---------- */
.page-app-download .ad-next__panel {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
}

.page-app-download .ad-next__links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  margin: var(--space-2) 0 0;
  padding: 0;
  list-style: none;
}

.page-app-download .ad-next__links li {
  display: grid;
  gap: 2px;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-next__links a {
  justify-self: start;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-primary);
  padding-bottom: 1px;
}

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

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

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

.page-app-download .ad-next__action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-app-download .ad-next__action .copy-btn {
  cursor: pointer;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-app-download .ad-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 768px) {
  .page-app-download .ad-entry {
    grid-template-columns: 56px minmax(0, 1fr) auto;
    align-items: start;
    gap: var(--space-2);
    padding-block: var(--space-4);
  }

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

  .page-app-download .ad-entry__cat {
    grid-column: 3;
    justify-self: end;
  }
}

@media (min-width: 960px) {
  .page-app-download .ad-hero__grid {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: var(--space-6);
  }

  .page-app-download .ad-idx {
    position: sticky;
    top: var(--space-6);
    align-self: start;
    border-top: none;
    padding-top: 0;
    padding-right: var(--space-2);
    text-align: right;
    border-right: var(--border-thin) solid var(--color-line);
  }

  .page-app-download .ad-idx__list {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: flex-end;
    gap: 0;
  }

  .page-app-download .ad-device__layout {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-app-download .ad-prep__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: var(--space-6);
    align-items: start;
  }

  .page-app-download .ad-first__body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
    gap: var(--space-6);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-app-download .ad-hero__blocks {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    grid-template-areas:
      "lead version"
      "lead prep";
    align-items: start;
  }

  .page-app-download .ad-block--lead {
    grid-area: lead;
    grid-column: auto;
  }

  .page-app-download .ad-block--version {
    grid-area: version;
  }

  .page-app-download .ad-block--prep {
    grid-area: prep;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-app-download .ad-tagband__item,
  .page-app-download .ad-cat,
  .page-app-download .ad-entry__cat,
  .page-app-download .ad-entry::before,
  .page-app-download .ad-idx__list a {
    transition: none;
  }

  .page-app-download .ad-tagband__item,
  .page-app-download .ad-tagband__item:nth-child(even),
  .page-app-download .ad-cat,
  .page-app-download .ad-entry__cat {
    transform: none;
  }
}