.page-app-download {
  --pd-rule: var(--color-contrast-surface);
  --pd-band: var(--color-surface-alt);
  --pd-band-deep: var(--color-surface-deep);
  --pd-gap: var(--space-4);
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-app-download .hero {
  padding-top: var(--space-4);
  padding-bottom: var(--space-8);
  border-bottom: var(--border-thick) solid var(--pd-rule);
}

.page-app-download .hero-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "copy" "scale" "figure";
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.page-app-download .hero-copy { grid-area: copy; min-width: 0; }
.page-app-download .hero-scale { grid-area: scale; min-width: 0; }
.page-app-download .hero-figure { grid-area: figure; margin: 0; min-width: 0; }

.page-app-download .hero-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: var(--tracking-heading);
  margin: var(--space-2) 0 var(--space-3);
  overflow-wrap: break-word;
}

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

.page-app-download .hero-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-4) 0 0;
  padding: var(--space-3) 0 0;
  border-top: var(--border-thick) solid var(--pd-rule);
}

.page-app-download .hero-figure-item { min-width: 0; }

.page-app-download .hero-figure-item dt {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  line-height: 1.4;
}

.page-app-download .hero-figure-item dd {
  margin: var(--space-1) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.page-app-download .hero-scale__cap {
  margin: 0 0 var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

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

.page-app-download .hero-scale__item { min-width: 0; }

.page-app-download .hero-scale__link {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-1) 0;
  border-top: var(--border-thin) solid var(--color-line);
  color: inherit;
  text-decoration: none;
}

.page-app-download .hero-scale__link:hover { border-top-color: var(--color-primary); }
.page-app-download .hero-scale__link:hover .hero-scale__text { color: var(--color-ink); }

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

.page-app-download .hero-scale__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-primary);
}

.page-app-download .hero-scale__text {
  font-size: var(--text-sm);
  line-height: 1.35;
  color: var(--color-ink-soft);
}

/* 图片容器统一约束 */
.page-app-download .figure-frame {
  margin: 0;
  border: var(--border-thick) solid var(--pd-rule);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

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

.page-app-download .hero-figure .figure-frame__media {
  aspect-ratio: 3 / 2;
}

/* ============ 章节头 ============ */
.page-app-download .section__head {
  max-width: var(--measure);
  margin-bottom: var(--space-4);
}

.page-app-download .section__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-primary-ink);
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 3px var(--space-2) 4px;
}

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

.page-app-download .section__note {
  margin: 0;
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

/* ============ 01 渠道 ============ */
.page-app-download .channel-list {
  border-top: var(--border-thick) solid var(--pd-rule);
}

.page-app-download .channel-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  grid-template-areas:
    "num title"
    "num text"
    "num meta";
  column-gap: var(--space-3);
  row-gap: var(--space-1);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .channel-item__num {
  grid-area: num;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}

.page-app-download .channel-item__title {
  grid-area: title;
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

.page-app-download .channel-item__text {
  grid-area: text;
  margin: 0;
  max-width: var(--measure);
  color: var(--color-ink);
  line-height: var(--leading-body);
}

.page-app-download .channel-item__meta {
  grid-area: meta;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-app-download .channel-item__meta strong {
  display: inline-block;
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--color-accent);
}

/* ============ 02 版本对照 ============ */
.page-app-download .version-figure {
  margin-bottom: var(--space-4);
}

.page-app-download .version-figure .figure-frame__media {
  aspect-ratio: 2 / 1;
}

.page-app-download .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  margin-bottom: var(--space-2);
  border-top: var(--border-thick) solid var(--pd-rule);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .filter-bar__label {
  margin-right: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.page-app-download .table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-app-download .version-table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.page-app-download .version-table caption {
  caption-side: top;
  text-align: left;
  padding-bottom: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-app-download .version-table th,
.page-app-download .version-table td {
  padding: var(--space-2);
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.page-app-download .version-table thead th {
  background: var(--pd-rule);
  color: var(--color-contrast-ink);
  border-bottom: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
}

.page-app-download .version-table tbody th {
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-ink);
}

.page-app-download .version-table tbody tr:nth-child(even) {
  background: color-mix(in srgb, var(--color-surface-deep) 55%, var(--color-surface) 45%);
}

.page-app-download .version-table tbody tr[data-filter-item]:hover {
  background: var(--color-highlight);
}

.page-app-download .version-table .tag { margin: 0 4px 4px 0; }

.page-app-download .mark-accent {
  display: inline-block;
  padding: 1px 5px;
  background: var(--color-highlight);
  color: var(--color-accent);
  font-weight: 700;
  border-radius: var(--radius-sm);
}

.page-app-download .table-foot {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
}

/* ============ 03 步骤 ============ */
.page-app-download .step-figure {
  max-width: 620px;
  margin-bottom: var(--space-4);
}

.page-app-download .step-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--border-thick) solid var(--pd-rule);
}

.page-app-download .step-block {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  column-gap: var(--space-3);
  padding: var(--space-4) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .step-block__num {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
  border-right: var(--border-thin) solid var(--color-line);
  padding-right: var(--space-2);
}

.page-app-download .step-block__body { min-width: 0; }

.page-app-download .step-block__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);
}

.page-app-download .step-block__text {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  line-height: var(--leading-body);
}

.page-app-download .note-note,
.page-app-download .note-check {
  max-width: var(--measure);
  margin: 0 0 var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  border-radius: var(--radius-sm);
}

.page-app-download .note-note {
  background: var(--color-primary-soft);
  color: var(--color-ink);
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-app-download .note-check {
  background: var(--pd-rule);
  color: var(--color-contrast-ink);
  border-left: var(--border-thick) solid var(--color-contrast-accent);
}

.page-app-download .note-note__key,
.page-app-download .note-check__key {
  display: inline-block;
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
}

.page-app-download .note-note__key { color: var(--color-primary); }
.page-app-download .note-check__key { color: var(--color-contrast-accent); }

/* ============ 04 准备疑问 ============ */
.page-app-download .prepare-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-app-download .prepare-main { min-width: 0; }
.page-app-download .prepare-aside { min-width: 0; }

.page-app-download .panel {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .panel:first-child {
  border-top: var(--border-thick) solid var(--pd-rule);
}

.page-app-download .panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) 0;
  background: transparent;
  border: 0;
  text-align: left;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  cursor: pointer;
}

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

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

.page-app-download .panel__arrow {
  flex: 0 0 auto;
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-primary);
  transition: transform 200ms ease-out;
}

.page-app-download .panel__head[aria-expanded="true"] .panel__arrow {
  transform: rotate(90deg);
}

.page-app-download .panel__body {
  padding: 0 0 var(--space-3);
}

.page-app-download .panel__body p {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  line-height: var(--leading-body);
}

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

.page-app-download .panel__body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-app-download .prepare-figure { margin-bottom: var(--space-3); }

.page-app-download .prepare-figure .figure-frame__media {
  aspect-ratio: 1 / 1;
}

.page-app-download .prepare-aside .card {
  margin-bottom: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  box-shadow: none;
}

.page-app-download .prepare-aside .card:last-child { margin-bottom: 0; }

.page-app-download .prepare-aside .card__title {
  margin: var(--space-2) 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

.page-app-download .prepare-aside .card__text {
  margin: 0 0 var(--space-3);
  max-width: none;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
}

.page-app-download .foot-note {
  max-width: 82ch;
  margin: var(--space-4) 0 0;
  padding-top: var(--space-3);
  border-top: var(--border-thick) solid var(--pd-rule);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
}

.page-app-download .foot-note a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============ 响应式 ============ */
@media (min-width: 560px) {
  .page-app-download .hero-scale__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-app-download .channel-item {
    grid-template-columns: 64px minmax(0, 1fr);
  }
  .page-app-download .step-block {
    grid-template-columns: 76px minmax(0, 1fr);
    column-gap: var(--space-4);
  }
  .page-app-download .step-block__num {
    font-size: var(--text-2xl);
  }
}

@media (min-width: 900px) {
  .page-app-download .hero-band {
    grid-template-columns: 176px minmax(0, 1fr) 320px;
    grid-template-areas: "scale copy figure";
    align-items: start;
    gap: var(--space-4);
  }

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

  .page-app-download .hero {
    padding-bottom: var(--section-y-lg);
  }

  .page-app-download .prepare-grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: var(--space-6);
  }

  .page-app-download .aside-sticky {
    position: sticky;
    top: var(--space-4);
  }
}

@media (min-width: 1100px) {
  .page-app-download .hero-band {
    grid-template-columns: 196px minmax(0, 1fr) 340px;
    gap: var(--space-4) var(--space-6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-app-download .panel__arrow { transition: none; }
}