.page-app-download {
  overflow-x: hidden;
  background: var(--color-surface);
}

/* ---------- 首屏 ---------- */
.page-app-download .ao-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px dotted var(--color-line);
  background: var(--color-surface);
}

.page-app-download .ao-hero::before {
  content: "";
  position: absolute;
  left: -14%;
  top: -34%;
  width: 72%;
  height: 168%;
  background: linear-gradient(142deg,
    color-mix(in srgb, var(--color-primary) 18%, transparent) 0%,
    color-mix(in srgb, var(--color-primary) 5%, transparent) 46%,
    transparent 68%);
  transform: rotate(-9deg);
  pointer-events: none;
}

.page-app-download .ao-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  padding-block: var(--space-8);
}

.page-app-download .ao-hero__title {
  margin: var(--space-3) 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.96;
  letter-spacing: -0.012em;
  color: var(--color-ink);
}

.page-app-download .ao-hero__sub {
  max-width: 56ch;
  margin: 0 0 var(--space-4);
  color: var(--color-ink-soft);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-app-download .ao-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-app-download .ao-lines li {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.page-app-download .ao-lines li b {
  color: var(--color-primary);
  font-weight: var(--weight-heading);
}

.page-app-download .ao-hero__media {
  margin: 0;
}

/* ---------- 四段式进度刻度 ---------- */
.page-app-download .ao-scale {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px dotted var(--color-line);
}

.page-app-download .ao-scale li {
  padding: var(--space-3) 0;
  border-bottom: 1px dotted var(--color-line);
}

.page-app-download .ao-scale__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}

.page-app-download .ao-scale__num em {
  font-style: normal;
  font-size: var(--text-sm);
  color: var(--color-primary);
  margin-left: var(--space-1);
}

.page-app-download .ao-scale__label {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

/* ---------- 主体骨架 ---------- */
.page-app-download .ao-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  padding-block: var(--section-y);
}

.page-app-download .ao-section {
  padding-block: var(--section-y);
  border-top: 1px dotted var(--color-line);
}

.page-app-download .ao-section:nth-of-type(even) {
  padding-block: var(--section-y-lg);
}

.page-app-download .ao-body > .ao-section:first-child {
  padding-top: 0;
  border-top: none;
}

.page-app-download .ao-h2 {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

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

/* ---------- 版本辨识 ---------- */
.page-app-download .ao-vergrid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-app-download .ao-vergrid__media {
  margin: 0;
}

.page-app-download .ao-rail-svg {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: var(--space-3);
  overflow: visible;
}

.page-app-download .ao-rail-a {
  stroke: var(--color-ink-muted);
  stroke-width: 1;
  stroke-dasharray: 5 5;
}

.page-app-download .ao-rail-b {
  stroke: var(--color-primary);
  stroke-width: 3;
}

.page-app-download .ao-rail-dot {
  fill: var(--color-surface-deep);
}

.page-app-download .ao-rail-dot--live {
  fill: var(--color-accent);
}

.page-app-download .ao-vercard {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}

.page-app-download .ao-vercard + .ao-vercard {
  margin-top: var(--space-3);
}

.page-app-download .ao-vercard--stable {
  border-left: var(--border-thin) solid var(--color-ink-muted);
}

.page-app-download .ao-vercard--preview {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  border-left: calc(var(--border-thin) * 3) solid var(--color-primary);
}

.page-app-download .ao-vercard__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: 1px dotted var(--color-line);
}

.page-app-download .ao-vercard__code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-primary);
}

.page-app-download .ao-vercard__name {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-app-download .ao-verdl {
  margin: var(--space-3) 0 0;
  display: grid;
  gap: var(--space-1);
}

.page-app-download .ao-verdl dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.page-app-download .ao-verdl dd {
  margin: 0 0 var(--space-2);
  color: var(--color-ink);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

/* ---------- 准备项 ---------- */
.page-app-download .ao-prep__media {
  margin: 0 0 var(--space-4);
}

.page-app-download .ao-prep {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-3);
  padding-bottom: var(--space-4);
}

.page-app-download .ao-prep__item {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}

.page-app-download .ao-prep__item:nth-child(even) {
  background: var(--color-surface-deep);
}

.page-app-download .ao-prep__item h3 {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-app-download .ao-prep__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-primary);
}

.page-app-download .ao-prep__item p {
  margin: 0 0 var(--space-2);
  color: var(--color-ink-soft);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-app-download .ao-prep__item p:last-child {
  margin-bottom: 0;
}

.page-app-download .ao-prep__check {
  color: var(--color-ink);
  font-size: var(--text-sm);
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-app-download .ao-prep__check b {
  display: inline-block;
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-primary);
}

/* ---------- 九步流程 ---------- */
.page-app-download .ao-steps {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
}

.page-app-download .ao-step {
  position: relative;
  padding: var(--space-4) 0 var(--space-4) var(--space-8);
  border-top: 1px dotted var(--color-line);
  transition: background 160ms ease;
}

.page-app-download .ao-step:last-child {
  border-bottom: 1px dotted var(--color-line);
}

.page-app-download .ao-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: var(--space-4);
  bottom: var(--space-4);
  width: var(--border-thin);
  background: var(--color-line);
  transition: background 160ms ease, width 160ms ease;
}

.page-app-download .ao-step:hover::before,
.page-app-download .ao-step:focus-within::before {
  background: var(--color-primary);
  width: calc(var(--border-thin) * 2);
}

.page-app-download .ao-step:hover {
  background: color-mix(in srgb, var(--color-primary-soft) 70%, transparent);
}

.page-app-download .ao-step__no {
  position: absolute;
  left: var(--space-2);
  top: calc(var(--space-4) + 3px);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-app-download .ao-step__title {
  margin: 0 0 var(--space-2);
  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 .ao-step p {
  margin: 0 0 var(--space-2);
  color: var(--color-ink-soft);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-app-download .ao-step p:last-child {
  margin-bottom: 0;
}

.page-app-download .ao-step a {
  color: var(--color-primary);
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}

.page-app-download .ao-step__note,
.page-app-download .ao-step__check {
  font-size: var(--text-sm);
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-app-download .ao-step__check {
  border-left-color: var(--color-primary);
  color: var(--color-ink);
}

.page-app-download .ao-step__note b,
.page-app-download .ao-step__check b {
  display: inline-block;
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
}

.page-app-download .ao-step__note b {
  color: var(--color-ink-muted);
}

.page-app-download .ao-step__check b {
  color: var(--color-primary);
}

/* ---------- 启动校验 ---------- */
.page-app-download .ao-checkgrid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-app-download .ao-checks {
  list-style: none;
  counter-reset: ao-chk;
  margin: 0;
  padding: 0;
}

.page-app-download .ao-checks li {
  position: relative;
  padding: var(--space-3) 0 var(--space-3) var(--space-6);
  border-bottom: 1px dotted var(--color-line);
}

.page-app-download .ao-checks li::before {
  counter-increment: ao-chk;
  content: "0" counter(ao-chk);
  position: absolute;
  left: 0;
  top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

.page-app-download .ao-checks h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-app-download .ao-checks p {
  margin: 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
}

.page-app-download .ao-retry {
  margin-top: var(--space-4);
  padding-left: var(--space-3);
  border-left: calc(var(--border-thin) * 2) solid var(--color-primary);
}

.page-app-download .ao-retry ol {
  margin: var(--space-2) 0 var(--space-3);
  padding-left: var(--space-4);
  color: var(--color-ink);
}

.page-app-download .ao-retry li {
  margin-bottom: var(--space-1);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-app-download .ao-retry p {
  margin: 0;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
}

.page-app-download .ao-retry a {
  color: var(--color-primary);
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}

.page-app-download .ao-verify__media {
  margin: 0;
}

/* ---------- 排查手风琴 ---------- */
.page-app-download .ao-blockers {
  margin-top: var(--space-4);
  border-top: 1px dotted var(--color-line);
}

.page-app-download .ao-blockers .accordion__panel p {
  margin: 0 0 var(--space-2);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-app-download .ao-blockers .accordion__panel p:last-child {
  margin-bottom: 0;
}

.page-app-download .ao-blockers .accordion__panel a {
  color: var(--color-primary);
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}

/* ---------- 尾部检索入口 ---------- */
.page-app-download .ao-tail {
  padding-block: var(--section-y) 0;
  border-top: 1px dotted var(--color-line);
}

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

.page-app-download .ao-tail__panel p {
  max-width: var(--measure);
  margin: 0;
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-app-download .ao-tail__panel p a {
  color: var(--color-primary);
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}

.page-app-download .ao-tail__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
  align-content: start;
}

.page-app-download .ao-tail__links li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-2);
  padding-block: var(--space-2);
  border-bottom: 1px dotted var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-app-download .ao-tail__links .num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-primary);
}

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

@media (min-width: 700px) {
  .page-app-download .ao-prep {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-app-download .ao-prep__item:nth-child(even) {
    transform: translateY(var(--space-6));
  }
}

@media (min-width: 860px) {
  .page-app-download .ao-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-app-download .ao-scale li {
    border-bottom: none;
    border-left: 1px dotted var(--color-line);
    padding-left: var(--space-3);
  }

  .page-app-download .ao-scale li:first-child {
    border-left: none;
    padding-left: 0;
  }
}

@media (min-width: 900px) {
  .page-app-download .ao-vergrid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--gutter);
    align-items: start;
  }

  .page-app-download .ao-checkgrid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--gutter);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-app-download .ao-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: end;
    gap: var(--space-8);
  }

  .page-app-download .ao-hero__media {
    transform: translateY(var(--space-6));
  }

  .page-app-download .ao-layout {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: var(--gutter);
    align-items: start;
  }

  .page-app-download .ao-tail__panel {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: var(--gutter);
  }
}

@media (max-width: 560px) {
  .page-app-download .ao-step {
    padding-left: var(--space-6);
  }

  .page-app-download .ao-step__no {
    left: var(--space-1);
  }
}