.page-platform {
  overflow-x: hidden;
  position: relative;
}

.page-platform section[id] {
  scroll-margin-top: 96px;
}

/* ---------- 面包屑 ---------- */
.page-platform .crumbs {
  margin-bottom: var(--space-5, 40px);
  margin-bottom: var(--space-4);
}

.page-platform .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-platform .crumbs__list li + li::before {
  content: "／";
  margin-right: var(--space-1);
  color: var(--color-ink-muted);
}

.page-platform .crumbs__list a {
  color: var(--color-primary);
  text-decoration: none;
}

.page-platform .crumbs__list a:hover,
.page-platform .crumbs__list a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-platform .intro {
  position: relative;
  padding: var(--space-6) 0 0;
}

.page-platform .intro__grid {
  display: grid;
  gap: var(--space-6);
}

.page-platform .intro__copy {
  min-width: 0;
}

.page-platform .intro .hero-title {
  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);
  margin: var(--space-3) 0 var(--space-4);
}

.page-platform .intro__copy .lead {
  margin: 0 0 var(--space-3);
  max-width: var(--measure);
}

.page-platform .intro__note {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  line-height: var(--leading-body);
  padding-left: var(--space-3);
  border-left: var(--border-thick) solid var(--color-primary-soft);
}

.page-platform .intro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-platform .intro__visual {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 340px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-contrast-surface);
  box-shadow: 8px 8px 0 var(--color-primary-soft);
}

.page-platform .intro__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-platform .intro__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-platform .intro__stats {
  position: relative;
  list-style: none;
  margin: 0;
  padding: var(--space-4);
  width: 100%;
  display: grid;
  gap: var(--space-3);
}

.page-platform .intro__stats .stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-contrast-line);
}

.page-platform .intro__stats .stat:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-platform .intro__stats .stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-ink);
}

.page-platform .intro__stats .stat__unit {
  font-size: var(--text-sm);
  margin-left: 2px;
  font-weight: var(--weight-body);
}

.page-platform .intro__stats .stat__label {
  flex: 1 1 12ch;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-contrast-ink);
  opacity: 0.86;
}

.page-platform .intro__band {
  margin-top: var(--space-8);
}

.page-platform .intro__band .chip {
  margin-left: auto;
  text-decoration: none;
}

/* ---------- 装饰形状 ---------- */
.page-platform .plat-deco {
  position: absolute;
  pointer-events: none;
  z-index: 0;
  display: none;
}

.page-platform .plat-deco--ring {
  top: var(--space-4);
  right: 4%;
  width: 118px;
  height: 118px;
  border: var(--border-thick) solid var(--color-highlight);
  border-radius: 50%;
}

.page-platform .plat-deco--slash {
  bottom: -26px;
  left: -30px;
  width: 92px;
  height: 92px;
  background: var(--color-highlight);
  clip-path: polygon(0 0, 100% 22%, 78% 100%, 0 74%);
}

/* ---------- 小节索引 ---------- */
.page-platform .index-strip {
  margin-top: var(--space-6);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-surface-alt);
}

.page-platform .index-strip__list {
  display: flex;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: var(--space-2) 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-platform .index-strip__link {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  white-space: nowrap;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.page-platform .index-strip__link .mono {
  color: var(--color-ink-muted);
}

.page-platform .index-strip__link:hover,
.page-platform .index-strip__link:focus-visible {
  color: var(--color-primary-ink);
  background: var(--color-primary);
  outline: none;
}

.page-platform .index-strip__link:hover .mono,
.page-platform .index-strip__link:focus-visible .mono {
  color: var(--color-primary-ink);
}

/* ---------- 通用章节标题 ---------- */
.page-platform .section-head__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: var(--space-2) 0 var(--space-3);
}

/* ---------- 麻烦段 ---------- */
.page-platform .trouble__grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-platform .trouble-card {
  position: relative;
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  overflow: hidden;
  box-shadow: 7px 7px 0 var(--color-surface-deep);
  transition: transform 0.24s ease, border-color 0.24s ease, box-shadow 0.24s ease;
}

.page-platform .trouble-card:hover {
  transform: translate(-4px, -4px);
  border-color: var(--color-accent);
  box-shadow: 11px 11px 0 var(--color-highlight);
}

.page-platform .trouble-card__content {
  position: relative;
  padding: var(--space-4);
  display: grid;
  gap: var(--space-2);
  align-content: start;
}

.page-platform .trouble-card--media {
  display: flex;
  align-items: flex-end;
  min-height: 400px;
  border-color: var(--color-contrast-surface);
  box-shadow: 7px 7px 0 var(--color-primary-soft);
  color: var(--color-contrast-ink);
}

.page-platform .trouble-card--media:hover {
  box-shadow: 11px 11px 0 var(--color-highlight);
}

.page-platform .trouble-card__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-platform .trouble-card__veil {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-platform .trouble-card--media .trouble-card__content {
  width: 100%;
}

.page-platform .trouble-card--b {
  background: var(--color-surface-deep);
}

.page-platform .trouble-card--c {
  background: var(--color-highlight);
}

.page-platform .trouble-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin: 0;
  color: var(--color-ink);
}

.page-platform .trouble-card--media .trouble-card__title,
.page-platform .trouble-card--media .eyebrow {
  color: var(--color-contrast-ink);
}

.page-platform .trouble-card__text {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-platform .trouble-card--media .trouble-card__text {
  color: var(--color-contrast-ink);
  opacity: 0.9;
}

.page-platform .trouble-card__impact {
  margin: 0;
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-platform .trouble-card--media .trouble-card__impact {
  border-top-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
  opacity: 0.85;
}

/* ---------- 支持段（深色） ---------- */
.page-platform .support {
  position: relative;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  overflow: hidden;
}

.page-platform .support__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
  opacity: 0.55;
}

.page-platform .support__veil {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-platform .support__inner {
  position: relative;
  z-index: 1;
}

.page-platform .support .eyebrow {
  color: var(--color-contrast-accent);
}

.page-platform .support .section-head__title {
  color: var(--color-contrast-ink);
}

.page-platform .support .lead {
  color: var(--color-contrast-ink);
  opacity: 0.86;
}

.page-platform .support__rails {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-platform .rail {
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-accent);
}

.page-platform .rail__idx {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}

.page-platform .rail__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
  margin: var(--space-2) 0 var(--space-2);
}

.page-platform .rail__text {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.85;
}

.page-platform .req-list {
  list-style: none;
  margin: var(--space-8) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-platform .req-item {
  display: grid;
  gap: var(--space-1);
  padding: var(--space-3);
  border: 1px solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-contrast-surface) 72%, transparent);
}

.page-platform .req-item__idx {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-accent);
}

.page-platform .req-item__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  margin: 0;
  color: var(--color-contrast-ink);
}

.page-platform .req-item__body {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.9;
}

.page-platform .req-item__fail {
  margin: 0;
  padding-top: var(--space-1);
  border-top: 1px solid var(--color-contrast-line);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-contrast-ink);
  opacity: 0.72;
}

/* ---------- 结果段（主色整块） ---------- */
.page-platform .result {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-platform .result__inner {
  display: grid;
  gap: var(--space-6);
}

.page-platform .result .eyebrow {
  color: var(--color-primary-ink);
  opacity: 0.82;
}

.page-platform .result__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-primary-ink);
  margin: var(--space-2) 0 var(--space-3);
}

.page-platform .result__lead {
  margin: 0;
  max-width: var(--measure);
  color: var(--color-primary-ink);
  line-height: var(--leading-body);
  opacity: 0.94;
}

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

.page-platform .tier {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-1) var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary-ink) 48%, transparent);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-primary-ink) 12%, transparent);
}

.page-platform .tier__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
}

.page-platform .tier__num {
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
}

.page-platform .tier__meta {
  flex-basis: 100%;
  font-size: var(--text-sm);
  opacity: 0.86;
}

.page-platform .result__note {
  margin: var(--space-4) 0 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-primary-ink);
  opacity: 0.94;
}

.page-platform .result__note a {
  color: var(--color-highlight);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

/* ---------- 入口分岔 ---------- */
.page-platform .branches {
  position: relative;
}

.page-platform .branches__grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-platform .branch {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 300px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: var(--border-thin) solid var(--color-contrast-surface);
  box-shadow: 8px 8px 0 var(--color-primary-soft);
}

.page-platform .branch__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-platform .branch__veil {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-platform .branch__body {
  position: relative;
  width: 100%;
  padding: var(--space-4);
  display: grid;
  gap: var(--space-2);
  align-content: start;
}

.page-platform .branch__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  margin: 0;
  color: var(--color-contrast-ink);
}

.page-platform .branch__text {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.9;
}

.page-platform .branch__modules-title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

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

.page-platform .module-item a {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-1) var(--space-2);
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  box-shadow: 5px 5px 0 var(--color-surface-deep);
  text-decoration: none;
  color: var(--color-ink);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-platform .module-item a:hover,
.page-platform .module-item a:focus-visible {
  transform: translate(-3px, -3px);
  border-color: var(--color-accent);
  box-shadow: 8px 8px 0 var(--color-highlight);
  outline: none;
}

.page-platform .module-item__idx {
  grid-column: 1;
  grid-row: 1;
  font-size: var(--text-xs);
  color: var(--color-accent);
  letter-spacing: 0.08em;
}

.page-platform .module-item__name {
  grid-column: 2;
  grid-row: 1;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
}

.page-platform .module-item__desc {
  grid-column: 2;
  grid-row: 2;
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--color-ink-soft);
}

/* ---------- 下一步 ---------- */
.page-platform .next__grid {
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.page-platform .next-card {
  position: relative;
  display: grid;
  gap: var(--space-1);
  padding: var(--space-4);
  padding-right: var(--space-6);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: 6px 6px 0 var(--color-primary-soft);
  text-decoration: none;
  color: var(--color-ink);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-platform .next-card:hover,
.page-platform .next-card:focus-visible {
  transform: translate(-4px, -4px);
  border-color: var(--color-accent);
  box-shadow: 10px 10px 0 var(--color-highlight);
  outline: none;
}

.page-platform .next-card__label {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-accent);
}

.page-platform .next-card__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

.page-platform .next-card__text {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.page-platform .next-card__arrow {
  position: absolute;
  right: var(--space-3);
  bottom: var(--space-3);
  font-size: var(--text-lg);
  color: var(--color-primary);
  transition: transform 0.2s ease, color 0.2s ease;
}

.page-platform .next-card:hover .next-card__arrow,
.page-platform .next-card:focus-visible .next-card__arrow {
  transform: translateX(4px);
  color: var(--color-accent);
}

.page-platform .next__foot {
  margin: var(--space-4) 0 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.page-platform .next__foot a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-platform .next__foot a:hover,
.page-platform .next__foot a:focus-visible {
  color: var(--color-accent);
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-platform .module-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-platform .next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-platform .plat-deco {
    display: block;
  }
}

@media (min-width: 720px) {
  .page-platform .section-head__title {
    font-size: var(--text-2xl);
  }

  .page-platform .result__title {
    font-size: var(--text-2xl);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-platform .intro {
    padding-top: var(--space-8);
  }

  .page-platform .intro__grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: var(--gutter);
    align-items: stretch;
  }

  .page-platform .intro__copy {
    grid-column: span 4;
  }

  .page-platform .intro__visual {
    grid-column: span 3;
    min-height: 100%;
  }

  .page-platform .index-strip__list {
    justify-content: space-between;
    overflow: visible;
  }

  .page-platform .trouble__grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    grid-template-areas:
      "a a a a b b b"
      "a a a a c c c";
    gap: var(--gutter);
    align-items: stretch;
  }

  .page-platform .trouble-card--media {
    grid-area: a;
    min-height: 460px;
  }

  .page-platform .trouble-card--b {
    grid-area: b;
  }

  .page-platform .trouble-card--c {
    grid-area: c;
    margin-top: var(--space-2);
  }

  .page-platform .support__rails {
    grid-template-columns: 5fr 4fr 3fr;
    gap: var(--gutter);
    align-items: start;
  }

  .page-platform .rail:nth-child(2) {
    padding-top: var(--space-4);
  }

  .page-platform .rail:nth-child(3) {
    padding-top: var(--space-6);
  }

  .page-platform .req-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-platform .result__inner {
    grid-template-columns: 5fr 7fr;
    gap: var(--gutter);
    align-items: start;
  }

  .page-platform .branches__grid {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: var(--gutter);
    align-items: stretch;
  }

  .page-platform .branch {
    grid-column: span 3;
    min-height: 380px;
  }

  .page-platform .branch__modules {
    grid-column: span 4;
  }

  .page-platform .next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--gutter);
  }
}

@media (min-width: 1200px) {
  .page-platform .intro__band {
    margin-top: var(--space-8);
  }

  .page-platform .plat-deco--ring {
    width: 148px;
    height: 148px;
  }
}
<<<END>>>

.page-platform {
  --space-5: var(--space-8);
}