.page-about {
  --about-cut: clamp(28px, 6vw, 88px);
  --about-paper-ink: #0B1734;
  --about-paper-body: #2C3D59;
  --about-paper-muted: #5C6C85;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(104px, 15vw, 176px) clamp(44px, 6vw, 80px);
  background:
    radial-gradient(120% 78% at 82% 4%, rgba(23, 195, 123, .17), transparent 62%),
    radial-gradient(96% 70% at 4% 98%, rgba(138, 107, 255, .16), transparent 58%),
    linear-gradient(180deg, var(--bw-night) 0%, var(--bw-deep) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(28, 53, 102, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28, 53, 102, .38) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px;
  mask-image: radial-gradient(120% 90% at 30% 20%, #000 12%, transparent 78%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: clamp(14px, 2vw, 24px) 0 0;
  font-size: clamp(36px, 8.4vw, 84px);
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--bw-ink);
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin-top: clamp(18px, 2.6vw, 28px);
  color: var(--bw-muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--bw-line);
}

.page-about .about-hero__rule {
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--bw-grass), var(--bw-cyan) 42%, var(--bw-gold) 78%, var(--bw-live));
  opacity: .85;
}

@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 3vw, 40px);
  }
}

/* ---------- Layout + TOC ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  padding-block: clamp(44px, 7vw, 88px) clamp(56px, 9vw, 120px);
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-family: var(--bw-editorial);
  font-size: 13px;
  letter-spacing: .22em;
  color: var(--bw-gold);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc .bw-toc__link {
  display: block;
  white-space: nowrap;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--bw-line);
  background: rgba(11, 23, 52, .8);
  font-size: 13px;
  color: var(--bw-muted);
  text-decoration: none;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .about-toc .bw-toc__link:hover,
.page-about .about-toc .bw-toc__link:focus-visible {
  color: var(--bw-ink);
  border-color: var(--bw-cyan);
}

.page-about .about-toc .bw-toc__link[aria-current="true"] {
  color: var(--bw-night);
  background: var(--bw-grass);
  border-color: var(--bw-grass);
  font-weight: 600;
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 112px;
    align-self: start;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc .bw-toc__link {
    border: 0;
    border-radius: 0;
    background: transparent;
    padding: 9px 12px 9px 16px;
    border-left: 2px solid var(--bw-line);
  }

  .page-about .about-toc .bw-toc__link[aria-current="true"] {
    background: transparent;
    border-left-color: var(--bw-grass);
    color: var(--bw-grass);
  }
}

/* ---------- Section shell ---------- */
.page-about .about-sec {
  position: relative;
  padding-block: clamp(24px, 4vw, 40px);
}

.page-about .about-sec + .about-sec {
  margin-top: clamp(24px, 4vw, 48px);
}

.page-about .about-sec__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2.4vw, 26px);
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-sec__num {
  font-family: var(--bw-editorial);
  font-size: clamp(38px, 6vw, 62px);
  line-height: .9;
  color: transparent;
  -webkit-text-stroke: 1px rgba(227, 179, 65, .7);
  letter-spacing: .02em;
}

.page-about .about-sec__kicker {
  margin: 0 0 6px;
  font-family: var(--bw-mono);
  font-size: 12px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--bw-muted);
}

.page-about .about-sec__lead {
  max-width: 68ch;
  color: var(--bw-muted);
  line-height: 1.85;
}

/* ---------- Timeline ---------- */
.page-about .about-timeline-figure {
  margin: clamp(22px, 3vw, 34px) 0 clamp(30px, 4vw, 48px);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 10px;
  width: 2px;
  background: linear-gradient(180deg, rgba(227, 179, 65, .85), rgba(28, 53, 102, .95) 24%, rgba(28, 53, 102, .95) 74%, rgba(23, 195, 123, .8));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 40px) 40px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  width: 15px;
  height: 15px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--bw-night);
  border: 2px solid var(--bw-gold);
  box-shadow: 0 0 0 4px rgba(227, 179, 65, .12);
}

.page-about .about-timeline__item--now::before {
  border-color: var(--bw-live);
  box-shadow: 0 0 0 4px rgba(255, 74, 94, .16);
}

.page-about .about-timeline__year {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  border-radius: 4px;
  background: rgba(227, 179, 65, .12);
  border: 1px solid rgba(227, 179, 65, .38);
  color: var(--bw-gold);
  font-size: 14px;
  letter-spacing: .06em;
}

.page-about .about-timeline__item--now .about-timeline__year {
  background: rgba(255, 74, 94, .12);
  border-color: rgba(255, 74, 94, .42);
  color: var(--bw-live);
}

.page-about .about-timeline__item .bw-h3 {
  margin: 0 0 8px;
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 60ch;
  color: var(--bw-muted);
  line-height: 1.85;
}

@media (min-width: 860px) {
  .page-about .about-timeline__item {
    width: calc(50% - 42px);
    padding-left: 0;
    padding-right: 0;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .about-timeline__item:nth-child(odd) {
    margin-left: 0;
    text-align: right;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .about-timeline__item:nth-child(odd)::before {
    left: auto;
    right: calc(-42px - 11px);
    transform: translateX(50%);
    top: 8px;
  }

  .page-about .about-timeline__item:nth-child(even)::before {
    left: calc(-42px + 11px);
  }
}

/* ---------- Archive (paper) ---------- */
.page-about .about-sec--paper {
  background: var(--bw-paper);
  color: var(--about-paper-ink);
  border-radius: var(--bw-radius);
  padding: clamp(26px, 5vw, 56px);
  box-shadow: 0 24px 60px rgba(2, 8, 20, .5);
}

.page-about .about-sec--paper .bw-h2,
.page-about .about-sec--paper .bw-h3 {
  color: var(--about-paper-ink);
}

.page-about .about-sec--paper .about-sec__lead,
.page-about .about-sec--paper p {
  color: var(--about-paper-body);
}

.page-about .about-sec--paper .about-sec__num {
  -webkit-text-stroke: 1px rgba(11, 23, 52, .45);
}

.page-about .about-sec--paper .about-sec__kicker {
  color: var(--bw-grass-deep);
}

.page-about .about-archive__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-archive__item {
  padding: 20px 20px 22px;
  border-radius: 14px;
  background: #FFFFFF;
  border: 1px solid rgba(11, 23, 52, .1);
  border-left: 4px solid var(--bw-grass);
}

.page-about .about-archive__item:nth-child(2) {
  border-left-color: var(--bw-gold);
}

.page-about .about-archive__item:nth-child(3) {
  border-left-color: var(--bw-violet);
}

.page-about .about-archive__value {
  display: block;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  color: var(--about-paper-ink);
  font-weight: 700;
}

.page-about .about-archive__item .bw-h3 {
  margin: 10px 0 8px;
  font-size: 18px;
}

.page-about .about-archive__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-paper-muted);
}

.page-about .about-archive__note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding-top: clamp(18px, 2.4vw, 26px);
  border-top: 1px dashed rgba(11, 23, 52, .22);
  line-height: 1.9;
}

@media (min-width: 760px) {
  .page-about .about-archive__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(16px, 2vw, 24px);
  }
}

/* ---------- Team ---------- */
.page-about .about-team__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-team__roles {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-team__role {
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  border-radius: 14px;
  background: rgba(11, 23, 52, .72);
  border: 1px solid var(--bw-line);
}

.page-about .about-team__badge {
  flex: 0 0 auto;
  font-size: 15px;
  font-weight: 700;
  color: var(--bw-cyan);
  letter-spacing: .06em;
}

.page-about .about-team__role .bw-h3 {
  margin: 0 0 6px;
  font-size: 18px;
}

.page-about .about-team__role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bw-muted);
}

.page-about .about-team__figure {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .about-team__split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .85fr);
  }

  .page-about .about-team__figure {
    position: sticky;
    top: 120px;
  }
}

/* ---------- Editorial rhythm ---------- */
.page-about .about-rhythm {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-rhythm__lane {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  border-radius: 16px;
  background: linear-gradient(160deg, rgba(11, 23, 52, .96), rgba(5, 11, 26, .96));
  border: 1px solid var(--bw-line);
  overflow: hidden;
}

.page-about .about-rhythm__lane::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
}

.page-about .about-rhythm__lane--daily::after {
  background: linear-gradient(90deg, var(--bw-live), transparent 72%);
}

.page-about .about-rhythm__lane--stage::after {
  background: linear-gradient(90deg, var(--bw-grass), transparent 72%);
}

.page-about .about-rhythm__lane--season::after {
  background: linear-gradient(90deg, var(--bw-gold), transparent 72%);
}

.page-about .about-rhythm__tick {
  display: inline-block;
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--bw-muted);
}

.page-about .about-rhythm__lane .bw-h3 {
  margin: 0 0 10px;
}

.page-about .about-rhythm__lane p {
  margin: 0;
  color: var(--bw-muted);
  line-height: 1.85;
}

@media (min-width: 820px) {
  .page-about .about-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(14px, 2vw, 22px);
  }

  .page-about .about-rhythm__lane:nth-child(2) {
    transform: translateY(18px);
  }
}

/* ---------- Ecosystem ---------- */
.page-about .about-sec--ecosystem {
  position: relative;
}

.page-about .about-ecosystem {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(18px, 3vw, 28px);
  align-items: center;
}

.page-about .about-orbit-wrap {
  margin: 0;
}

.page-about .about-orbit {
  display: block;
  width: min(100%, 380px);
  height: auto;
  margin: 0 auto;
}

.page-about .about-orbit__core {
  font-family: var(--bw-display);
  font-size: 20px;
  font-weight: 700;
  fill: var(--bw-ink);
  letter-spacing: .04em;
}

.page-about .about-orbit__coreSub {
  font-family: var(--bw-mono);
  font-size: 10px;
  fill: var(--bw-muted);
  letter-spacing: .16em;
}

.page-about .about-orbit__legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 22px;
  margin-top: 18px;
  font-family: var(--bw-mono);
  font-size: 12.5px;
  color: var(--bw-muted);
}

.page-about .about-orbit__legendItem {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-orbit__dot--data {
  background: var(--bw-cyan);
}

.page-about .about-orbit__dot--content {
  background: var(--bw-gold);
}

.page-about .about-ecosystem__copy .bw-h3 {
  margin: 0 0 10px;
}

.page-about .about-ecosystem__copy .bw-h3 + p {
  margin: 0 0 clamp(20px, 3vw, 30px);
  color: var(--bw-muted);
  line-height: 1.85;
}

.page-about .about-ecosystem__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 900px) {
  .page-about .about-ecosystem {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  }
}

/* ---------- Next ---------- */
.page-about .about-next__figure {
  margin: clamp(18px, 3vw, 28px) 0 clamp(24px, 3vw, 34px);
  border-radius: 16px;
  overflow: hidden;
}

.page-about .about-next__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-next__item {
  padding: 18px 0 0;
  border-top: 2px solid rgba(11, 23, 52, .16);
}

.page-about .about-next__item .bw-h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.page-about .about-next__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-paper-muted);
}

@media (min-width: 820px) {
  .page-about .about-next__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 2.6vw, 30px);
  }
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 56px);
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--bw-radius);
  background:
    radial-gradient(110% 130% at 90% 10%, rgba(23, 195, 123, .2), transparent 60%),
    linear-gradient(150deg, var(--bw-deep), var(--bw-night));
  border: 1px solid var(--bw-line);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
}

.page-about .about-cta__text {
  max-width: 58ch;
  margin: 0 0 clamp(20px, 3vw, 28px);
  color: var(--bw-muted);
  line-height: 1.85;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__actions .bw-btn {
  text-decoration: none;
}

/* ---------- Media polish ---------- */
.page-about .bw-media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-timeline-figure .bw-media__img {
  aspect-ratio: 16 / 9;
}

.page-about .about-team__figure .bw-media__img {
  aspect-ratio: 3 / 2;
}

.page-about .about-next__figure .bw-media__img {
  aspect-ratio: 16 / 9;
}

.page-about .bw-note {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--bw-muted);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }

  .page-about .about-rhythm__lane:nth-child(2) {
    transform: none;
  }
}
<<<END>>>

奇怪——输出里混进了几个不该出现的英文词（“replace”、“Actually”、“OK let me just write it out”），而且 `<PAGE_CSS>` 的闭合标记格式也不太对。

修正后的结尾应该是：

```html
.page-about .bw-note {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--bw-muted);
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }

  .page-about .about-rhythm__lane:nth-child(2) {
    transform: none;
  }
}
<<<END>>>
```

同时，`<PAGE_CSS>` 的闭合标记本身也需要写成 `` 这种三尖括号形式，和原文保持一致。

你把它替换掉就行。