.page-app-download {
  --ad-hair: color-mix(in srgb, var(--color-ink) 16%, transparent);
  --ad-hair-inv: color-mix(in srgb, var(--color-primary-ink) 24%, transparent);
  --ad-hair-accent: color-mix(in srgb, var(--color-accent-ink) 30%, transparent);
}

/* ---------- 深色带上的文字可读性 ---------- */
.page-app-download .band--deep .breadcrumb,
.page-app-download .band--deep .breadcrumb a,
.page-app-download .band--deep .breadcrumb li,
.page-app-download .band--deep .section-title,
.page-app-download .band--deep .eyebrow,
.page-app-download .band--deep .eyebrow__num,
.page-app-download .band--deep .eyebrow__text,
.page-app-download .band--deep .lede {
  color: var(--color-contrast-ink);
}

.page-app-download .band--deep .breadcrumb a {
  text-decoration-color: color-mix(in srgb, var(--color-contrast-ink) 45%, transparent);
}

.page-app-download .band--primary .section-title,
.page-app-download .band--primary .eyebrow,
.page-app-download .band--primary .eyebrow__num,
.page-app-download .band--primary .eyebrow__text,
.page-app-download .band--primary .lede {
  color: var(--color-primary-ink);
}

.page-app-download .band--accent .section-title,
.page-app-download .band--accent .eyebrow,
.page-app-download .band--accent .eyebrow__num,
.page-app-download .band--accent .eyebrow__text,
.page-app-download .band--accent .lede {
  color: var(--color-accent-ink);
}

/* ================= 01 首屏 ================= */
.page-app-download .ad-hero__head {
  margin-top: var(--space-6);
}

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

.page-app-download .ad-hero__lede {
  margin: var(--space-3) 0 0;
  max-width: 46ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

.page-app-download .ad-collage {
  margin-top: var(--space-8);
  display: grid;
  gap: var(--gutter);
  grid-template-columns: 1fr;
}

.page-app-download .ad-block {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: var(--space-1);
  min-height: 188px;
  padding: var(--space-3);
  border-radius: var(--radius-md);
}

.page-app-download .ad-block--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-app-download .ad-block--surface {
  background: var(--color-surface);
  color: var(--color-ink);
}

.page-app-download .ad-block--lead {
  padding: 0;
  overflow: hidden;
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-app-download .ad-block__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3 / 2;
  border-radius: var(--radius-md);
}

.page-app-download .ad-block__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-app-download .ad-block__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-app-download .ad-block__overlay {
  position: absolute;
  inset: auto 0 0 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  color: var(--color-primary-ink);
}

.page-app-download .ad-block__num {
  display: block;
  margin: 0;
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  font-size: var(--text-figure);
  line-height: 1;
}

.page-app-download .ad-block--accent .ad-block__num,
.page-app-download .ad-block--surface .ad-block__num {
  font-size: var(--text-3xl);
}

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

.page-app-download .ad-block__note {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  opacity: 0.88;
}

.page-app-download .ad-strip {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  color: var(--color-contrast-ink);
}

.page-app-download .ad-strip__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.page-app-download .ad-strip__line {
  margin: 0;
  max-width: 62ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

@media (min-width: 640px) {
  .page-app-download .ad-collage {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-app-download .ad-block--lead,
  .page-app-download .ad-strip {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-app-download .ad-collage {
    grid-template-columns: repeat(8, 1fr);
  }
  .page-app-download .ad-block--lead {
    grid-column: span 4;
    min-height: 430px;
    padding: 0;
  }
  .page-app-download .ad-block--accent {
    grid-column: span 2;
  }
  .page-app-download .ad-block--surface {
    grid-column: span 2;
  }
  .page-app-download .ad-block--lead .ad-block__media {
    position: absolute;
    inset: 0;
    aspect-ratio: auto;
    border-radius: 0;
  }
}

/* ================= 02 三端对照 ================= */
.page-app-download .ad-matrix__head {
  display: grid;
  gap: var(--gutter);
  grid-template-columns: 1fr;
  align-items: end;
  margin-bottom: var(--space-6);
}

.page-app-download .ad-matrix__head .lede {
  margin-top: var(--space-3);
  color: var(--color-ink-soft);
}

.page-app-download .ad-matrix__media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
}

.page-app-download .ad-matrix__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

@media (min-width: 900px) {
  .page-app-download .ad-matrix__head {
    grid-template-columns: 1.15fr 1fr;
  }
}

.page-app-download .ad-frame {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.page-app-download .ad-matrix__scroller {
  overflow-x: auto;
}

.page-app-download .ad-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  text-align: left;
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-app-download .ad-table__caption {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  border-bottom: var(--border-thin) solid var(--color-line);
}

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

.page-app-download .ad-table thead th {
  background: var(--color-surface-deep);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.page-app-download .ad-table tbody th {
  background: var(--color-surface-alt);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  white-space: nowrap;
}

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

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

.page-app-download .ad-mark {
  display: inline-block;
  margin-right: var(--space-1);
  padding: 1px 8px;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  line-height: 1.7;
  vertical-align: 1px;
}

.page-app-download .ad-mark--on {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.page-app-download .ad-mark--off {
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
}

/* ================= 03 九条说明 ================= */
.page-app-download .ad-lessons__head {
  display: grid;
  gap: var(--gutter);
  grid-template-columns: 1fr;
  align-items: end;
  margin-bottom: var(--space-6);
}

.page-app-download .ad-lessons__head .lede {
  margin-top: var(--space-3);
}

.page-app-download .ad-lessons__media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
}

.page-app-download .ad-lessons__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

@media (min-width: 900px) {
  .page-app-download .ad-lessons__head {
    grid-template-columns: 1.5fr 1fr;
  }
}

.page-app-download .ad-lessons .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
}

.page-app-download .ad-lessons .filter-chip {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  line-height: 1.6;
  padding: 6px 16px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-accent-ink) 52%, transparent);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-accent-ink);
  cursor: pointer;
}

.page-app-download .ad-lessons .filter-chip:hover,
.page-app-download .ad-lessons .filter-chip:focus-visible {
  background: color-mix(in srgb, var(--color-accent-ink) 18%, transparent);
}

.page-app-download .ad-lessons .filter-chip:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}

.page-app-download .ad-lessons .filter-chip[aria-pressed="true"] {
  background: var(--color-accent-ink);
  color: var(--color-accent);
  border-color: var(--color-accent-ink);
}

.page-app-download .ad-folds {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.page-app-download .ad-fold {
  border: var(--border-thin) solid var(--ad-hair-accent);
  border-radius: var(--radius-sm);
}

.page-app-download .ad-fold__head {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 0;
  background: transparent;
  color: var(--color-accent-ink);
  font-family: var(--font-body);
  text-align: left;
  cursor: pointer;
}

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

.page-app-download .ad-fold__idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  opacity: 0.72;
}

.page-app-download .ad-fold__title {
  flex: 1;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
}

.page-app-download .ad-fold__count {
  flex: none;
  border-color: color-mix(in srgb, var(--color-accent-ink) 60%, transparent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
}

.page-app-download .ad-fold__body {
  padding: 0 var(--space-3) var(--space-2);
}

.page-app-download .ad-item {
  padding: var(--space-3) 0;
  border-top: var(--border-thin) solid color-mix(in srgb, var(--color-accent-ink) 20%, transparent);
  color: var(--color-accent-ink);
}

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

.page-app-download .ad-item__desc {
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-app-download .ad-item__spec {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-1) var(--space-2);
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
}

.page-app-download .ad-item__spec dt {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  opacity: 0.76;
  white-space: nowrap;
}

.page-app-download .ad-item__spec dd {
  margin: 0;
  max-width: 60ch;
}

@media (max-width: 560px) {
  .page-app-download .ad-item__spec {
    grid-template-columns: 1fr;
    gap: 2px var(--space-2);
  }
  .page-app-download .ad-item__spec dd {
    margin-bottom: var(--space-1);
  }
}

/* ================= 04 四步准备 ================= */
.page-app-download .ad-steps__top {
  display: grid;
  gap: var(--gutter);
  grid-template-columns: 1fr;
  align-items: end;
  margin-bottom: var(--space-6);
}

.page-app-download .ad-steps__top .lede {
  margin-top: var(--space-3);
}

.page-app-download .ad-steps__media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-md);
}

.page-app-download .ad-steps__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

@media (min-width: 900px) {
  .page-app-download .ad-steps__top {
    grid-template-columns: 1.3fr 1fr;
  }
}

.page-app-download .ad-steps__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--gutter);
  grid-template-columns: 1fr;
}

.page-app-download .ad-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-1) var(--space-3);
  align-items: baseline;
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--ad-hair-inv);
  color: var(--color-primary-ink);
}

.page-app-download .ad-step__num {
  font-family: var(--font-mono);
  font-weight: var(--weight-heading);
  font-size: var(--text-3xl);
  line-height: 1;
}

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

.page-app-download .ad-step__body {
  grid-column: 2;
  margin: 0;
  max-width: 42ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-primary-ink) 88%, transparent);
}

@media (min-width: 760px) {
  .page-app-download .ad-steps__list {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ================= 05 边界 ================= */
.page-app-download .ad-limits__list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--gutter);
  grid-template-columns: 1fr;
}

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

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

.page-app-download .ad-limit__body {
  margin: 0;
  max-width: 46ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

@media (min-width: 760px) {
  .page-app-download .ad-limits__list {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ================= 06 出口 ================= */
.page-app-download .ad-next__panel {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}

.page-app-download .ad-next__panel .section-title {
  margin: 0;
}

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

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

.page-app-download .ad-next__actions .btn {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
}

@media (min-width: 760px) {
  .page-app-download .ad-next__panel {
    padding: var(--space-8) var(--space-6);
  }
}