.page-app-download {
  --app-offset-1: 0px;
  --app-offset-2: 12px;
  --app-offset-3: 24px;
  --app-offset-4: 36px;
}

/* ---------- 面包屑 ---------- */
.page-app-download .app-crumbs {
  padding: var(--space-3) 0 0;
}

/* ---------- 首屏框景 ---------- */
.page-app-download .app-hero {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-6) 0 var(--space-8);
}

.page-app-download .app-hero__frame {
  position: relative;
  padding: var(--space-6) 0 var(--space-2);
}

.page-app-download .app-hero__frame::before,
.page-app-download .app-hero__frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: var(--border-thin);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-contrast-line) 0,
    var(--color-contrast-line) var(--border-thin),
    transparent var(--border-thin),
    transparent 40px
  );
}
.page-app-download .app-hero__frame::before { top: 0; }
.page-app-download .app-hero__frame::after { bottom: 0; }

.page-app-download .app-hero .kicker {
  color: var(--color-contrast-accent);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  margin: 0;
}

.page-app-download .app-hero__title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-ink);
  margin: var(--space-3) 0 0;
  max-width: 20ch;
}

.page-app-download .app-hero__lede {
  margin: var(--space-3) 0 0;
  max-width: 60ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

/* ---------- 首屏数字 ---------- */
.page-app-download .app-stats {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
}

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

.page-app-download .app-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  font-weight: var(--weight-heading);
  color: var(--color-contrast-ink);
}

.page-app-download .app-stats__num::after {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  margin-top: var(--space-1);
  background: var(--color-contrast-accent);
}

.page-app-download .app-stats__label {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

/* ---------- 四端卡片 ---------- */
.page-app-download .app-devices {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding-bottom: var(--space-2);
}

.page-app-download .app-device {
  display: block;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-contrast-ink) 7%, transparent);
  color: var(--color-contrast-ink);
  text-decoration: none;
  transition: background 160ms ease-out;
}

.page-app-download .app-device:hover,
.page-app-download .app-device:focus-visible {
  background: color-mix(in srgb, var(--color-contrast-ink) 15%, transparent);
}

.page-app-download .app-device__name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-ink);
}

.page-app-download .app-device__sys {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-contrast-accent);
}

.page-app-download .app-device__note {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.65;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

/* ---------- 首屏下方横幅 ---------- */
.page-app-download .app-visual {
  padding: var(--space-6) 0 0;
}

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

.page-app-download .app-banner .figure__frame {
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-surface-deep);
}

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

/* ---------- 正文区 ---------- */
.page-app-download .app-body {
  padding: var(--space-8) 0 var(--section-y-lg);
}

.page-app-download .doc-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

/* 目录轨道 */
.page-app-download .doc-rail {
  position: relative;
}

.page-app-download .rail-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink);
}

.page-app-download .rail-list {
  list-style: none;
  margin: var(--space-2) 0 0;
  padding: 0;
  position: relative;
}

.page-app-download .rail-list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--border-thin);
  background: var(--color-line);
}

.page-app-download .rail-link {
  display: block;
  padding: var(--space-1) 0 var(--space-1) var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 120ms ease-out, border-color 120ms ease-out;
}

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

.page-app-download .rail-link.is-current {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: var(--weight-heading);
}

.page-app-download .rail-marker {
  position: absolute;
  left: -4px;
  top: 0;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-sm);
  background: var(--color-focus);
  transition: top 160ms ease-out;
  pointer-events: none;
}

/* ---------- 区块 ---------- */
.page-app-download .app-block {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-app-download .doc-body > .app-block:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.page-app-download .app-block__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-app-download .app-block__lede {
  margin: var(--space-2) 0 0;
  max-width: 62ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 单端详情 ---------- */
.page-app-download .app-end {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-app-download .app-end__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-app-download .app-end__name {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-app-download .app-fields {
  margin: var(--space-2) 0 0;
}

.page-app-download .app-field {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .app-field:last-child {
  border-bottom: 0;
}

.page-app-download .app-field__key {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-app-download .app-field__val {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

/* ---------- 安装准备清单 ---------- */
.page-app-download .app-checks {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.page-app-download .app-check {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
}

.page-app-download .app-check__box {
  position: relative;
  flex: none;
  width: 16px;
  height: 16px;
  margin-top: 5px;
  border: var(--border-thin) solid var(--color-ink-muted);
  border-radius: var(--radius-sm);
}

.page-app-download .app-check__box::after {
  content: "";
  position: absolute;
  inset: 3px;
  background: var(--color-ink-muted);
}

.page-app-download .app-check--gap {
  background: var(--color-highlight);
}

.page-app-download .app-check--gap .app-check__box {
  border-color: var(--color-accent);
}

.page-app-download .app-check--gap .app-check__box::after {
  background: var(--color-accent);
}

.page-app-download .app-check__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-ink);
}

.page-app-download .app-check__desc {
  margin: 4px 0 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

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

.page-app-download .app-prepare__media .figure__frame {
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-surface-deep);
}

.page-app-download .figure__caption {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ---------- 边界说明 ---------- */
.page-app-download .app-boundary {
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
}

.page-app-download .app-boundary__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  color: var(--color-ink);
}

.page-app-download .app-boundary__list {
  margin: var(--space-2) 0 0;
  padding-left: 1.2em;
  display: grid;
  gap: var(--space-1);
}

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

.page-app-download .app-boundary__note {
  margin: var(--space-3) 0 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

/* ---------- 图文分栏 ---------- */
.page-app-download .app-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: start;
  margin-top: var(--space-4);
}

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

.page-app-download .app-split__media .figure__frame {
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-surface-deep);
}

/* ---------- 步骤 ---------- */
.page-app-download .step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-app-download .step {
  display: flex;
  gap: var(--space-2);
}

.page-app-download .step-badge {
  flex: none;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  background: var(--color-surface-deep);
  color: var(--color-ink-muted);
  transition: background 180ms ease-out, color 180ms ease-out;
}

.page-app-download .step.is-visible .step-badge {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-app-download .step__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.4;
  color: var(--color-ink);
}

.page-app-download .step__body p:not(.step__title) {
  margin: var(--space-1) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 版本号 ---------- */
.page-app-download .app-version {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
}

.page-app-download .app-version__label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-app-download .app-version__btn {
  font-family: var(--font-mono);
}

/* ---------- 双轨对比 ---------- */
.page-app-download .app-tracks {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

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

.page-app-download .app-track--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-app-download .app-track__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.4;
  color: inherit;
}

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

.page-app-download .app-track li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: inherit;
  opacity: 0.92;
}

.page-app-download .app-track li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: var(--border-thin);
  background: currentColor;
  opacity: 0.7;
}

/* ---------- 站内入口 ---------- */
.page-app-download .app-routes {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.page-app-download .app-route {
  display: block;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  text-decoration: none;
  transition: background 140ms ease-out;
}

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

.page-app-download .app-route__name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  color: var(--color-primary);
}

.page-app-download .app-route__desc {
  display: block;
  margin-top: 4px;
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

/* ---------- 出口 ---------- */
.page-app-download .app-cta {
  margin-top: var(--space-6);
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  display: grid;
  gap: var(--space-4);
  align-items: center;
}

.page-app-download .app-cta__text {
  margin: 0;
  max-width: 58ch;
  font-size: var(--text-lg);
  line-height: 1.75;
  color: color-mix(in srgb, var(--color-contrast-ink) 88%, transparent);
}

.page-app-download .app-cta__btn {
  justify-self: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-app-download .app-devices {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-app-download .app-field {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: var(--space-3);
    align-items: baseline;
  }

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

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

@media (min-width: 760px) {
  .page-app-download .app-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-app-download .app-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--gutter);
  }

  .page-app-download .app-split--flip .app-split__media {
    order: -1;
  }
}

@media (min-width: 900px) {
  .page-app-download .app-devices {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }

  .page-app-download .app-device:nth-child(2) {
    transform: translateY(var(--app-offset-2));
  }

  .page-app-download .app-device:nth-child(3) {
    transform: translateY(var(--app-offset-3));
  }

  .page-app-download .app-device:nth-child(4) {
    transform: translateY(var(--app-offset-4));
  }

  .page-app-download .app-cta {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .page-app-download .app-cta__btn {
    justify-self: end;
  }
}

@media (min-width: 1000px) {
  .page-app-download .doc-shell {
    grid-template-columns: minmax(168px, 3fr) minmax(0, 9fr);
    gap: var(--gutter);
  }

  .page-app-download .doc-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    max-height: calc(100vh - 128px);
    overflow-y: auto;
  }

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

@media (min-width: 1240px) {
  .page-app-download .app-hero__frame {
    padding: var(--space-8) 0 var(--space-2);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-app-download .app-device,
  .page-app-download .app-route,
  .page-app-download .rail-link,
  .page-app-download .rail-marker,
  .page-app-download .step-badge {
    transition: none;
  }

  .page-app-download .app-device:nth-child(n) {
    transform: none;
  }
}
</main>