.page-app-download {
  --ad-mark-a: var(--color-primary);
  --ad-mark-b: var(--color-accent);
  --ad-mark-c: var(--color-contrast-surface);
}

/* ---------------- 首屏 ---------------- */
.page-app-download .ad-hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-6) 0 var(--space-8);
  background: var(--color-surface);
}

.page-app-download .ad-hero__crumb {
  margin-bottom: var(--space-4);
}

.page-app-download .ad-hero__layers {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-4);
}

.page-app-download .ad-hero__headline {
  margin: var(--space-2) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.04;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-app-download .ad-hero__lede {
  max-width: 46ch;
  margin: var(--space-3) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-hero__figure {
  margin: 0;
}

.page-app-download .ad-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-app-download .ad-hero__figcaption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
}

/* 三块错位形态块 */
.page-app-download .ad-modes {
  position: relative;
  z-index: 3;
  display: grid;
  gap: var(--space-2);
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
}

.page-app-download .ad-mode {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-height: 216px;
  padding: var(--space-4);
  border-radius: var(--radius-sm);
}

.page-app-download .ad-mode--browser {
  background: var(--ad-mark-a);
  color: var(--color-primary-ink);
}

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

.page-app-download .ad-mode--desktop {
  background: var(--ad-mark-c);
  color: var(--color-contrast-ink);
}

.page-app-download .ad-mode__index {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  opacity: 0.75;
}

.page-app-download .ad-mode__name {
  margin: 0;
  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);
}

.page-app-download .ad-mode__for {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.6;
  opacity: 0.9;
}

.page-app-download .ad-mode__num {
  margin: auto 0 0;
}

.page-app-download .ad-mode__figure {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 0.95;
}

.page-app-download .ad-mode__unit {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  line-height: 1.5;
  opacity: 0.82;
}

/* ---------------- 差异对照 ---------------- */
.page-app-download .ad-compare {
  background: var(--color-surface-alt);
}

.page-app-download .ad-compare__head {
  display: grid;
  gap: var(--space-4);
}

.page-app-download .ad-compare__intro {
  max-width: 58ch;
  margin: var(--space-3) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-compare__figure {
  margin: 0;
}

.page-app-download .ad-compare__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-app-download .ad-compare__caption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
}

.page-app-download .ad-table {
  margin-top: var(--space-6);
}

.page-app-download .ad-table__head {
  display: none;
}

.page-app-download .ad-table__row {
  padding: var(--space-4) 0;
}

.page-app-download .ad-table__key {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.page-app-download .ad-table__idx {
  flex: 0 0 auto;
  padding-left: var(--space-1);
  border-left: 2px solid var(--ad-mark-b);
  font-size: var(--text-xs);
  line-height: 1.2;
  color: var(--color-ink-muted);
}

.page-app-download .ad-table__label {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-app-download .ad-table__cell {
  position: relative;
  padding: var(--space-1) 0 var(--space-1) var(--space-4);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-table__cell::before {
  content: attr(data-label);
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* ---------------- 折叠说明 ---------------- */
.page-app-download .ad-faq {
  margin-top: var(--space-8);
}

.page-app-download .ad-faq .accordion__panel p {
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------------- 准备清单 ---------------- */
.page-app-download .ad-prep {
  background: var(--color-surface);
}

.page-app-download .ad-prep__intro {
  max-width: 58ch;
  margin: var(--space-3) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-prep__figure {
  margin: var(--space-6) 0 0;
}

.page-app-download .ad-prep__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-app-download .ad-prep__caption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
}

.page-app-download .ad-prep__groups {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.page-app-download .ad-prep__group-title {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}

.page-app-download .ad-prep__group-title::before {
  content: "";
  display: block;
  width: 22px;
  height: 3px;
  margin-bottom: var(--space-2);
  background: var(--ad-mark-b);
}

.page-app-download .ad-prep__group:nth-child(2) .ad-prep__group-title::before {
  background: var(--ad-mark-a);
}

.page-app-download .ad-prep__group:nth-child(3) .ad-prep__group-title::before {
  background: var(--ad-mark-c);
}

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

.page-app-download .ad-prep__item {
  display: grid;
  grid-template-columns: 15px minmax(0, 1fr);
  gap: var(--space-2);
}

.page-app-download .ad-check {
  width: 15px;
  height: 15px;
  margin-top: 4px;
  border: var(--border-thin) solid var(--color-ink-muted);
  border-radius: var(--radius-sm);
}

.page-app-download .ad-prep__text {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink);
}

.page-app-download .ad-prep__note {
  margin: var(--space-1) 0 0;
  font-size: var(--text-xs);
  line-height: 1.55;
  color: var(--color-ink-muted);
}

/* ---------------- 登录与迁移 ---------------- */
.page-app-download .ad-migrate {
  background: var(--color-surface-alt);
}

.page-app-download .ad-migrate__grid {
  display: grid;
  gap: var(--space-6);
}

.page-app-download .ad-migrate__item {
  margin-top: var(--space-4);
  padding: var(--space-3) 0 var(--space-3) var(--space-4);
  border-left: 3px solid var(--color-line);
}

.page-app-download .ad-migrate__item--a {
  border-left-color: var(--ad-mark-a);
}

.page-app-download .ad-migrate__item--b {
  border-left-color: var(--ad-mark-b);
}

.page-app-download .ad-migrate__item--c {
  border-left-color: var(--ad-mark-c);
}

.page-app-download .ad-migrate__tag {
  margin: 0 0 var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

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

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

.page-app-download .ad-migrate__link a {
  color: var(--color-primary);
  font-weight: 600;
  text-underline-offset: 3px;
}

.page-app-download .ad-migrate__figure {
  margin: 0;
}

.page-app-download .ad-migrate__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.page-app-download .ad-migrate__caption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  line-height: 1.5;
  color: var(--color-ink-muted);
}

/* ---------------- 选择建议 ---------------- */
.page-app-download .ad-pick {
  background: var(--color-surface);
}

.page-app-download .ad-pick__list {
  display: grid;
  gap: var(--space-6);
  max-width: var(--measure);
  margin: var(--space-6) 0 0;
  padding: 0;
  list-style: none;
}

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

.page-app-download .ad-pick__who::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: var(--space-2);
  background: var(--ad-mark-a);
  border-radius: var(--radius-sm);
  vertical-align: middle;
}

.page-app-download .ad-pick__item--b .ad-pick__who::before {
  background: var(--ad-mark-b);
}

.page-app-download .ad-pick__item--c .ad-pick__who::before {
  background: var(--ad-mark-c);
}

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

.page-app-download .ad-pick__note {
  max-width: var(--measure);
  margin: var(--space-8) 0 0;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

.page-app-download .ad-pick__note a {
  color: var(--color-primary);
  font-weight: 600;
  text-underline-offset: 3px;
}

/* ---------------- 边界说明 ---------------- */
.page-app-download .ad-boundary {
  padding: var(--space-8) 0;
  background: var(--color-surface-deep);
}

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

.page-app-download .ad-boundary__text {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-app-download .ad-boundary__text a {
  color: var(--color-primary);
  font-weight: 600;
  text-underline-offset: 3px;
}

.page-app-download .ad-boundary__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

/* ---------------- 链接与焦点 ---------------- */
.page-app-download a:focus-visible,
.page-app-download .accordion__trigger:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------------- 断点 ---------------- */
@media (min-width: 780px) {
  .page-app-download .ad-modes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-2);
  }

  .page-app-download .ad-mode--browser {
    margin-top: var(--space-6);
  }

  .page-app-download .ad-mode--mobile {
    margin-top: 0;
  }

  .page-app-download .ad-mode--desktop {
    margin-top: var(--space-4);
  }

  .page-app-download .ad-prep__groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-app-download .ad-pick__list {
    gap: var(--space-8);
  }
}

@media (min-width: 860px) {
  .page-app-download .ad-table__head,
  .page-app-download .ad-table__row {
    display: grid;
    grid-template-columns: minmax(150px, 1.1fr) repeat(3, minmax(0, 1fr));
    gap: var(--space-4);
    align-items: start;
  }

  .page-app-download .ad-table__head {
    padding-bottom: var(--space-2);
  }

  .page-app-download .ad-table__row {
    padding: var(--space-4) 0;
  }

  .page-app-download .ad-table__corner {
    font-size: var(--text-xs);
    letter-spacing: 0.1em;
    color: var(--color-ink-muted);
  }

  .page-app-download .ad-table__col {
    position: relative;
    padding-top: var(--space-3);
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: var(--weight-heading);
    line-height: var(--leading-heading);
  }

  .page-app-download .ad-table__col::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 38px;
    height: 3px;
    background: currentColor;
  }

  .page-app-download .ad-table__col--a {
    color: var(--ad-mark-a);
  }

  .page-app-download .ad-table__col--b {
    color: var(--ad-mark-b);
  }

  .page-app-download .ad-table__col--c {
    color: var(--ad-mark-c);
  }

  .page-app-download .ad-table__key {
    margin-bottom: 0;
  }

  .page-app-download .ad-table__cell {
    padding: 0;
  }

  .page-app-download .ad-table__cell::before {
    display: none;
  }

  .page-app-download .ad-table__label {
    font-size: var(--text-base);
  }
}

@media (min-width: 900px) {
  .page-app-download .ad-hero {
    padding-bottom: var(--section-y);
  }

  .page-app-download .ad-hero__layers {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 0;
    margin-top: var(--space-8);
  }

  .page-app-download .ad-hero__copy {
    grid-column: 1 / 7;
    grid-row: 1;
    z-index: 2;
    align-self: center;
    padding: var(--space-6) var(--space-6) var(--space-6) 0;
    background: var(--color-surface);
  }

  .page-app-download .ad-hero__figure {
    grid-column: 4 / 13;
    grid-row: 1;
    z-index: 1;
    padding: var(--space-8) 0;
  }

  .page-app-download .ad-hero__lede {
    max-width: 34ch;
  }

  .page-app-download .ad-compare__head {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-6);
    align-items: end;
    margin-bottom: var(--space-6);
  }

  .page-app-download .ad-table {
    margin-top: 0;
  }

  .page-app-download .ad-migrate__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: var(--space-6);
    align-items: start;
  }

  .page-app-download .ad-migrate__body {
    grid-column: 1 / 8;
  }

  .page-app-download .ad-migrate__figure {
    grid-column: 8 / 13;
    margin-top: var(--space-6);
  }
}

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