.page-about .about-hero {
  padding-block: clamp(1.6rem, 4vw, 2.6rem) clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: start;
}

.page-about .about-hero__title {
  margin: clamp(1rem, 2.5vw, 1.6rem) 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5vw, 3.1rem);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: 0.02em;
  color: var(--c-text);
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin: clamp(1.1rem, 2.6vw, 1.6rem) 0 0;
  max-width: 60ch;
  font-size: clamp(0.98rem, 1.5vw, 1.08rem);
  line-height: 1.9;
  color: rgba(234, 242, 247, 0.78);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.2rem, 4vw, 2.8rem);
  margin-top: clamp(1.7rem, 4vw, 2.5rem);
  padding-top: 1.35rem;
  border-top: 1px solid var(--c-line);
}

.page-about .about-stat {
  min-width: 0;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 2.6vw, 1.7rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--c-cyan);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--c-dim);
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-line);
  overflow: hidden;
  background: linear-gradient(160deg, rgba(37, 216, 224, 0.09), transparent 62%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.72fr);
    gap: clamp(2.5rem, 5vw, 4rem);
  }
}

/* ---------- 时间轴 ---------- */

.page-about .about-track {
  padding-block: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-timeline {
  display: block;
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  padding-block: clamp(1.8rem, 5vw, 3.1rem);
  border-top: 1px solid var(--c-line);
}

.page-about .about-timeline__item:first-child {
  border-top: 0;
  padding-top: 0.5rem;
}

.page-about .about-timeline__node {
  position: relative;
  padding-left: 1.7rem;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px rgba(37, 216, 224, 0.13);
}

.page-about .about-timeline__seq {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.6vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--c-cyan);
}

.page-about .about-timeline__phase {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--c-dim);
}

.page-about .about-timeline__body {
  min-width: 0;
}

.page-about .about-timeline__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 3.1vw, 1.8rem);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: 0.02em;
  color: var(--c-text);
  max-width: 26ch;
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.88;
  color: rgba(234, 242, 247, 0.78);
}

.page-about .about-timeline__text a {
  color: var(--c-cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 214, 222, 0.42);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-timeline__text a:hover,
.page-about .about-timeline__text a:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .about-timeline__figure {
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 768px) {
  .page-about .about-timeline__item {
    grid-template-columns: minmax(0, 190px) minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3.5rem);
  }
}

/* ---------- 团队结构横带 ---------- */

.page-about .about-band {
  margin-block: clamp(2rem, 5vw, 3.6rem);
  padding-block: clamp(2.4rem, 6vw, 4.2rem);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  background: linear-gradient(180deg, rgba(37, 216, 224, 0.055), rgba(11, 22, 34, 0) 70%);
}

.page-about .about-band__head {
  max-width: 62ch;
  margin-bottom: clamp(1.5rem, 4vw, 2.4rem);
}

.page-about .about-band__kicker {
  margin: 0 0 0.7rem;
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
}

.page-about .about-band__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.6vw, 2.1rem);
  font-weight: 800;
  line-height: 1.36;
  letter-spacing: 0.02em;
  color: var(--c-text);
}

.page-about .about-band__lead {
  margin: 0;
  font-size: 1rem;
  line-height: 1.88;
  color: rgba(234, 242, 247, 0.76);
}

.page-about .about-band__figure {
  margin: 0 0 clamp(1.5rem, 4vw, 2.4rem);
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-line);
  overflow: hidden;
}

.page-about .about-band__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-band__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-band__col {
  background: var(--c-ink-2);
  padding: clamp(1.35rem, 3.4vw, 2.1rem);
  transition: background 0.3s var(--ease);
}

.page-about .about-band__col:hover {
  background: #163047;
}

.page-about .about-band__col-title {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--c-cyan);
}

.page-about .about-band__col-text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.82;
  color: rgba(234, 242, 247, 0.74);
}

@media (min-width: 768px) {
  .page-about .about-band__cols {
    grid-template-columns: 1.15fr 1fr 0.95fr;
  }
}

/* ---------- 收束 ---------- */

.page-about .about-outro {
  padding-block: clamp(3rem, 8vw, 6.5rem) clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-outro__inner {
  max-width: 58ch;
}

.page-about .about-outro__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.6vw, 2.05rem);
  font-weight: 800;
  line-height: 1.38;
  letter-spacing: 0.02em;
  color: var(--c-text);
}

.page-about .about-outro__text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.88;
  color: rgba(234, 242, 247, 0.76);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: clamp(1.6rem, 4vw, 2.3rem);
}
<<<END>>>
错了，最后多输出了 <<<END>>>。正确结尾应为 PAGE_CSS 段落结束，不追加任何标记。