.page-platform {
  overflow-x: clip;
}

/* ---------- 首屏海报层 ---------- */
.page-platform .hero-plate {
  padding-top: var(--space-3);
  padding-bottom: var(--section-y);
}

.page-platform .hero-plate .breadcrumb {
  margin-bottom: var(--space-4);
}

.page-platform .hero-plate__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-platform .hero-plate__poster {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  padding: var(--space-6) var(--space-3) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.page-platform .hero-plate__eyebrow {
  margin: 0;
  color: var(--color-primary-ink);
  opacity: 0.76;
}

.page-platform .hero-plate__title {
  margin: 0;
  font-size: var(--text-display);
  line-height: 0.92;
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  word-break: keep-all;
}

.page-platform .hero-plate__lede {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-primary-ink);
  opacity: 0.94;
}

.page-platform .hero-plate__visual {
  margin: 0;
}

.page-platform .hero-plate__figures {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: var(--space-6);
  border-top: var(--border-thick) solid var(--color-ink);
}

.page-platform .hero-plate__figure {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-platform .hero-plate__num {
  display: block;
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}

.page-platform .hero-plate__figure-note {
  margin: 0;
  max-width: 44ch;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 四条主线 ---------- */
.page-platform .tracks {
  background: var(--color-surface-deep);
  padding-block: var(--space-4);
  border-bottom: var(--border-thick) solid var(--color-ink);
}

.page-platform .tracks__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.page-platform .tracks__label {
  margin: 0;
  color: var(--color-ink-soft);
}

.page-platform .tracks__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-platform .track {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: var(--space-2);
  row-gap: var(--space-1);
  align-items: baseline;
  padding: var(--space-2) var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-line);
  text-decoration: none;
  color: var(--color-ink);
  transition: background-color 150ms ease-out, color 150ms ease-out;
}

.page-platform .track:hover,
.page-platform .track:focus-visible {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-platform .track__no {
  font-size: var(--text-sm);
  opacity: 0.7;
}

.page-platform .track__name {
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-platform .track__desc {
  grid-column: 1 / -1;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: inherit;
  opacity: 0.72;
}

/* ---------- 四段式矩阵 ---------- */
.page-platform .matrix-group {
  padding-bottom: var(--section-y);
}

.page-platform .matrix-group--alt {
  background: var(--color-surface-alt);
}

.page-platform .section-mark__inner {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.page-platform .section-mark__no {
  font-size: var(--text-lg);
  font-weight: 700;
}

.page-platform .section-mark__label {
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
}

.page-platform .matrix-group__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-platform .matrix-group__aside {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.page-platform .matrix-group__title {
  margin: 0;
}

.page-platform .point-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--border-thick) solid var(--color-ink);
}

.page-platform .point-list__item {
  padding: var(--space-2) var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  transition: background-color 150ms ease-out;
}

.page-platform .point-list__item:hover,
.page-platform .point-list__item:focus-within {
  background: var(--color-primary-soft);
}

.page-platform .point-list__text {
  display: block;
}

.page-platform .point-list__scope {
  display: inline-block;
  margin-top: var(--space-1);
  padding: 0 var(--space-1);
  background: var(--color-surface-deep);
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  border-radius: var(--radius-sm);
  transition: background-color 150ms ease-out, color 150ms ease-out;
}

.page-platform .point-list__item:hover .point-list__scope,
.page-platform .point-list__item:focus-within .point-list__scope {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-accent);
}

.page-platform .matrix-group__status {
  align-self: flex-start;
}

.page-platform .matrix-group__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

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

.page-platform .matrix-group__link {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-platform .matrix-group__link:hover,
.page-platform .matrix-group__link:focus-visible {
  background: var(--color-highlight);
  color: var(--color-ink);
}

.page-platform .matrix-group__figure {
  margin: 0;
}

.page-platform .matrix-group .table-ledger {
  width: 100%;
}

/* ---------- 指标行 ---------- */
.page-platform .metric-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--border-thick) solid var(--color-ink);
}

.page-platform .metric-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-2);
  align-items: baseline;
  padding: var(--space-2) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-platform .metric-row__key {
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
}

.page-platform .metric-row__val {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

/* ---------- 子页入口 ---------- */
.page-platform .entry-strip__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-platform .entry-strip__eyebrow {
  margin: 0 0 var(--space-1);
  color: var(--color-contrast-accent);
}

.page-platform .entry-strip__title {
  margin: 0;
  color: var(--color-contrast-ink);
}

.page-platform .entry-strip__body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
}

.page-platform .entry-strip__text {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.86;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-platform .hero-plate__figures {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--gutter);
    border-bottom: var(--border-thick) solid var(--color-ink);
  }

  .page-platform .hero-plate__figure {
    padding: var(--space-4) 0;
    border-bottom: 0;
  }

  .page-platform .hero-plate__figure + .hero-plate__figure {
    padding-left: var(--gutter);
    border-left: var(--border-thin) solid var(--color-line);
  }

  .page-platform .tracks__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-bottom: var(--border-thin) solid var(--color-line);
  }

  .page-platform .track {
    border-right: var(--border-thin) solid var(--color-line);
  }

  .page-platform .track:nth-child(2n) {
    border-right: 0;
  }
}

@media (min-width: 900px) {
  .page-platform .hero-plate__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--gutter);
    align-items: stretch;
  }

  .page-platform .hero-plate__poster {
    padding: var(--space-6) var(--space-4) calc(var(--space-6) + var(--space-4));
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 56px), 0 100%);
  }

  .page-platform .tracks__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-platform .track {
    padding: var(--space-3) var(--space-2);
  }

  .page-platform .track:nth-child(2n) {
    border-right: var(--border-thin) solid var(--color-line);
  }

  .page-platform .track:last-child {
    border-right: 0;
  }

  .page-platform .matrix-group__grid {
    grid-template-columns: minmax(0, 2fr) minmax(0, 5fr);
    gap: var(--gutter);
    align-items: start;
  }

  .page-platform .matrix-group__aside {
    position: sticky;
    top: var(--space-3);
  }

  .page-platform .matrix-group--alt .matrix-group__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 2fr);
  }

  .page-platform .matrix-group--alt .matrix-group__aside {
    order: 2;
  }

  .page-platform .entry-strip__inner {
    grid-template-columns: minmax(0, 2fr) minmax(0, 5fr);
    gap: var(--gutter);
    align-items: start;
  }
}
<<<END>>>