.page-app-download {
  --cap-index: calc(var(--space-6) + var(--space-1));
  --cap-aside: calc(var(--space-8) * 3 + var(--space-2));
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-app-download .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-3) 0;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.page-app-download .breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  padding-bottom: 2px;
}

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

.page-app-download .crumb-sep {
  color: var(--color-line);
}

/* ---------- 首屏深色色块 ---------- */
.page-app-download .booth {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-4) 0 var(--space-8);
}

.page-app-download .booth-frame {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  position: relative;
}

.page-app-download .booth-title {
  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-contrast-ink);
  margin: var(--space-3) 0 var(--space-3);
}

.page-app-download .booth-lede {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

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

.page-app-download .bfigure {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-top: var(--space-2);
  border-top: var(--border-thick) solid var(--color-contrast-accent);
}

.page-app-download .bfigure-value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-ink);
}

.page-app-download .bfigure-value--word {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.page-app-download .bfigure-unit {
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
  color: var(--color-contrast-accent);
  margin-left: 2px;
}

.page-app-download .bfigure-label {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.page-app-download .booth-plate {
  margin: 0;
  padding: var(--space-1);
  border: var(--border-thin) solid var(--color-contrast-line);
  background: color-mix(in srgb, var(--color-contrast-ink) 7%, transparent);
}

.page-app-download .booth-plate img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 页内目录条 ---------- */
.page-app-download .jumpline {
  background: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .jumpline-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-4);
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.page-app-download .toc-title {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.page-app-download .toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-app-download .toc-link {
  display: inline-block;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
}

.page-app-download .toc-link:hover,
.page-app-download .toc-link.is-active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------- 区块头 ---------- */
.page-app-download .section-head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.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);
  color: var(--color-ink);
  margin: 0;
}

.page-app-download .section-note {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-muted);
}

/* ---------- 六项能力 ---------- */
.page-app-download .cap-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-app-download .cap-item {
  position: relative;
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4) 0 calc(var(--space-4) + 4px);
}

.page-app-download .cap-item::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .cap-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-primary);
  padding-top: var(--space-1);
  border-top: var(--border-thick) solid var(--color-primary);
  width: max-content;
  min-width: var(--cap-index);
}

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

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

.page-app-download .cap-aside {
  border-left: var(--border-thick) solid var(--color-primary-soft);
  padding-left: var(--space-2);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-app-download .cap-aside .aside-head {
  margin: 0 0 var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-primary);
}

.page-app-download .cap-aside .aside-note {
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-app-download .cap-aside .aside-note:last-child {
  margin-bottom: 0;
}

/* ---------- 版本差别 ---------- */
.page-app-download .plate-wide {
  margin: 0 0 var(--space-4);
  padding: var(--space-1);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
}

.page-app-download .plate-wide img,
.page-app-download .mid-plate img,
.page-app-download .prep-plate img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-app-download .media-caption {
  margin: var(--space-1) 0 0;
  padding: 0 var(--space-1);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

.page-app-download .table-wrap {
  overflow: auto;
  max-height: 78vh;
  border: var(--border-thin) solid var(--color-line);
  -webkit-overflow-scrolling: touch;
}

.page-app-download .table-caption {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .changes-table {
  width: 100%;
  min-width: 700px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.page-app-download .changes-table th,
.page-app-download .changes-table td {
  text-align: left;
  vertical-align: top;
  padding: var(--space-2) var(--space-3);
  line-height: 1.75;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-app-download .changes-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--color-primary-soft);
  color: var(--color-ink);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
}

.page-app-download .changes-table tbody th {
  font-weight: 600;
  color: var(--color-ink);
  white-space: nowrap;
}

.page-app-download .changes-table td {
  color: var(--color-ink-soft);
}

.page-app-download .changes-table tbody tr:nth-child(even) {
  background: var(--color-surface-alt);
}

.page-app-download .changes-table tbody tr:last-child th,
.page-app-download .changes-table tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 中段分隔图 ---------- */
.page-app-download .mid-plate {
  margin: 0 0 var(--space-6);
  padding: var(--space-1);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-deep);
}

/* ---------- 准备清单 ---------- */
.page-app-download .prep-layout {
  display: grid;
  gap: var(--space-6);
  align-items: start;
}

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

.page-app-download .prep-item {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
}

.page-app-download .prep-box {
  flex: none;
  width: calc(var(--space-2) - 2px);
  height: calc(var(--space-2) - 2px);
  margin-top: 5px;
  border: var(--border-thin) solid var(--color-primary);
}

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

.page-app-download .prep-text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.85;
  color: var(--color-ink-soft);
}

.page-app-download .prep-plate {
  margin: 0;
  padding: var(--space-1);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-deep);
}

/* ---------- 边界 ---------- */
.page-app-download .boundary-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--border-thick) solid var(--color-primary);
}

.page-app-download .boundary-item {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

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

.page-app-download .boundary-text {
  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 .next-frame {
  padding: var(--space-4) var(--space-3);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  outline: var(--border-thin) solid var(--color-line);
  outline-offset: 4px;
  margin: var(--space-1);
}

.page-app-download .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-app-download .next-item {
  padding-left: var(--space-3);
  border-left: var(--border-thick) solid var(--color-primary);
}

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

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

.page-app-download .next-text a:hover {
  color: var(--color-focus);
}

.page-app-download a:focus-visible,
.page-app-download .toc-link:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 滚动显现（无 JS 也完整呈现） ---------- */
@supports (animation-timeline: view()) {
  .page-app-download [data-reveal] {
    animation: app-download-reveal linear both;
    animation-timeline: view();
    animation-range: entry 4% cover 24%;
  }
}

@keyframes app-download-reveal {
  from {
    opacity: 0.35;
  }
  to {
    opacity: 1;
  }
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 880px) {
  .page-app-download .booth {
    padding: var(--space-4) 0 var(--space-8);
  }

  .page-app-download .booth-frame {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--gutter);
    row-gap: var(--space-4);
    padding: var(--space-6) var(--space-6) var(--space-6);
    outline: var(--border-thin) solid var(--color-contrast-line);
    outline-offset: 3px;
  }

  .page-app-download .booth-copy {
    grid-column: 1 / 8;
    grid-row: 1;
  }

  .page-app-download .booth-plate {
    grid-column: 1 / 8;
    grid-row: 2;
  }

  .page-app-download .booth-figures {
    grid-column: 8 / 13;
    grid-row: 1 / 3;
    align-content: start;
    gap: var(--space-4) var(--space-3);
    padding-top: var(--space-4);
  }

  .page-app-download .bfigure:nth-child(2),
  .page-app-download .bfigure:nth-child(4) {
    margin-top: var(--space-4);
  }

  .page-app-download .section-head {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    column-gap: var(--gutter);
    align-items: end;
  }

  .page-app-download .cap-item {
    grid-template-columns: var(--cap-index) minmax(0, 1fr) var(--cap-aside);
    column-gap: var(--gutter);
    align-items: start;
    padding: var(--space-6) 0 calc(var(--space-6) + 4px);
  }

  .page-app-download .prep-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: var(--gutter);
  }

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

@media (min-width: 1024px) {
  .page-app-download .booth-copy {
    grid-column: 1 / 8;
  }

  .page-app-download .booth-figures {
    grid-column: 8 / 13;
  }

  .page-app-download .boundary-item {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    column-gap: var(--gutter);
    align-items: baseline;
  }
}

@media (hover: hover) {
  .page-app-download .cap-item:hover .cap-aside {
    border-left-color: var(--color-primary);
    background: color-mix(in srgb, var(--color-primary-soft) 55%, transparent);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-app-download [data-reveal] {
    animation: none !important;
    opacity: 1 !important;
  }

  .page-app-download .cap-aside {
    transition: none;
  }
}
</main>