.page-about {
  --about-block: clamp(48px, 7.5vw, 100px);
  --about-gap: clamp(16px, 2.6vw, 28px);
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: clip;
  font-family: var(--font-body);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: .03em;
}

.page-about p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.72;
}

.page-about p:last-child {
  margin-bottom: 0;
}

/* ---------- 通用区块头 ---------- */

.page-about .about-section-head {
  margin-bottom: clamp(26px, 3.6vw, 44px);
}

.page-about .about-h2 {
  font-size: clamp(23px, 3.5vw, 36px);
  color: var(--paper-light);
  max-width: 30ch;
}

.page-about .about-h2--ink {
  color: var(--ink-900);
}

.page-about .about-section-head__lede {
  margin-top: 16px;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.72;
  color: var(--cyan-soft);
  opacity: .84;
}

.page-about .about-section-head__lede--ink {
  color: rgba(6, 18, 38, .72);
  opacity: 1;
}

.page-about .about-label--ink {
  color: var(--ink-700);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(24px, 4vw, 44px) 0 clamp(46px, 6.5vw, 88px);
  background:
    radial-gradient(120% 95% at 100% 0%, rgba(0, 229, 204, .18), transparent 58%),
    linear-gradient(178deg, var(--ink-800), var(--ink-900) 78%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 46px);
  align-items: end;
}

.page-about .about-hero__label {
  margin-top: 22px;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-size: clamp(29px, 5.2vw, 54px);
  letter-spacing: .045em;
  line-height: 1.16;
  color: var(--paper-light);
  max-width: 20ch;
}

.page-about .about-hero__intro {
  max-width: 54ch;
  color: rgba(244, 239, 228, .82);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: .02em;
}

.page-about .about-hero__fact-label {
  font-size: 13px;
  line-height: 1.55;
  color: rgba(191, 247, 242, .78);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  padding: 8px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(155deg, rgba(0, 229, 204, .14), rgba(6, 18, 38, 0) 58%);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 8px;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(0, 229, 204, .14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 204, .14) 1px, transparent 1px);
  background-size: 46px 46px;
  mix-blend-mode: screen;
}

.page-about .about-hero__media .media__caption {
  margin: 10px 2px 2px;
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(191, 247, 242, .68);
}

/* ---------- 三时段内容组织 ---------- */

.page-about .about-stages-section {
  background: var(--ink-900);
}

.page-about .about-stages {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
}

.page-about .about-stage {
  padding: 26px 0 28px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stage__phase {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .about-stage__title {
  font-size: clamp(18px, 2.2vw, 22px);
  margin-bottom: 12px;
  color: var(--paper-light);
}

.page-about .about-stage__text {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 239, 228, .76);
}

.page-about .about-stages__foot {
  margin-top: clamp(24px, 3vw, 36px);
  padding: 20px 0 0 18px;
  border-left: 2px solid var(--amber);
  max-width: 70ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(191, 247, 242, .8);
}

/* ---------- 团队（暖纸区 + 纯 CSS 标签页） ---------- */

.page-about .about-team {
  position: relative;
  background: var(--paper);
  color: var(--ink-900);
  padding: var(--about-block) 0;
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) 34%, var(--amber) 34%, var(--amber) 52%, var(--ink-700) 52%, var(--ink-700) 100%);
}

.page-about .about-team p {
  color: rgba(6, 18, 38, .78);
}

.page-about .about-team__body {
  position: relative;
}

.page-about .about-team__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-team__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-team__tab {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  font-size: 14px;
  letter-spacing: .05em;
  color: var(--ink-800);
  background: rgba(251, 247, 238, .7);
  border: 1px solid rgba(6, 18, 38, .2);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}

.page-about .about-team__tab:hover {
  background: rgba(0, 229, 204, .16);
  border-color: rgba(6, 18, 38, .45);
  transform: translateY(-2px);
}

.page-about #about-team-editorial:checked ~ .about-team__tabs label[for="about-team-editorial"],
.page-about #about-team-data:checked ~ .about-team__tabs label[for="about-team-data"],
.page-about #about-team-ux:checked ~ .about-team__tabs label[for="about-team-ux"] {
  background: var(--ink-800);
  color: var(--paper-light);
  border-color: var(--ink-800);
}

.page-about .about-team__radio:focus-visible ~ .about-team__tabs label {
  outline: 2px solid var(--ink-700);
  outline-offset: 3px;
}

.page-about .about-team__panel {
  display: none;
  padding: clamp(20px, 3vw, 32px) 0 0;
  border-top: 2px solid var(--ink-800);
}

.page-about #about-team-editorial:checked ~ .about-team__panels .about-team__panel--editorial,
.page-about #about-team-data:checked ~ .about-team__panels .about-team__panel--data,
.page-about #about-team-ux:checked ~ .about-team__panels .about-team__panel--ux {
  display: block;
  animation: about-fade .22s ease both;
}

@keyframes about-fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-about .about-team__panel-title {
  font-family: var(--font-editorial);
  font-size: clamp(19px, 2.4vw, 25px);
  color: var(--ink-900);
  margin-bottom: 14px;
}

.page-about .about-team__panel p {
  max-width: 64ch;
}

.page-about .about-team__list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.68;
  color: rgba(6, 18, 38, .72);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 9px;
  height: 2px;
  background: var(--amber);
}

.page-about .about-team__media {
  margin: clamp(30px, 4vw, 46px) 0 0;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid rgba(6, 18, 38, .18);
}

.page-about .about-team__media .media__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(6, 18, 38, .58);
}

/* ---------- 发展历程 ---------- */

.page-about .about-history__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

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

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 0 22px 22px;
  border-left: 1px solid var(--line);
  transition: transform .2s ease, background .2s ease;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--line-strong);
  transition: background .2s ease, box-shadow .2s ease;
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-visible {
  transform: translateX(4px);
  outline: none;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-visible::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 204, .2);
}

.page-about .about-timeline__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  font-size: clamp(17px, 2.1vw, 21px);
  color: var(--paper-light);
  margin-bottom: 8px;
}

.page-about .about-timeline__body p {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 239, 228, .74);
  max-width: 58ch;
}

.page-about .about-history__media {
  margin: 0;
  align-self: start;
}

.page-about .about-history__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  box-shadow: 14px 14px 0 rgba(0, 229, 204, .1);
}

.page-about .about-history__media .media__caption {
  margin-top: 14px;
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(191, 247, 242, .64);
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-reach__cell {
  background: linear-gradient(165deg, var(--ink-700), var(--ink-800));
  padding: 22px 16px;
  transition: background .2s ease;
}

.page-about .about-reach__cell:hover {
  background: linear-gradient(165deg, var(--ink-600), var(--ink-700));
}

.page-about .about-reach__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: .01em;
  margin-bottom: 8px;
}

.page-about .about-reach__label {
  font-size: 13px;
  line-height: 1.55;
  color: rgba(191, 247, 242, .8);
}

.page-about .about-reach__note {
  margin-top: clamp(26px, 3.4vw, 40px);
  padding: clamp(22px, 3vw, 34px);
  border-left: 3px solid var(--amber);
  background: linear-gradient(120deg, rgba(0, 229, 204, .08), rgba(18, 52, 90, .5));
}

.page-about .about-reach__note-title {
  font-family: var(--font-editorial);
  font-size: clamp(18px, 2.3vw, 24px);
  color: var(--paper-light);
  margin-bottom: 14px;
}

.page-about .about-reach__note p {
  font-size: 15px;
  line-height: 1.76;
  color: rgba(244, 239, 228, .78);
  max-width: 76ch;
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 204, .55);
  transition: border-color .18s ease, color .18s ease;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--paper-light);
  border-bottom-color: var(--amber);
}

/* ---------- 下一步与联系 ---------- */

.page-about .about-connect {
  background: var(--paper-light);
  color: var(--ink-900);
  padding: var(--about-block) 0 clamp(36px, 5vw, 60px);
  border-top: 1px solid rgba(6, 18, 38, .12);
}

.page-about .about-connect__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-connect__intro {
  margin-top: 16px;
  max-width: 48ch;
  color: rgba(6, 18, 38, .74);
}

.page-about .about-connect__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-btn-ink {
  color: var(--ink-800);
  border-color: rgba(6, 18, 38, .38);
}

.page-about .about-connect__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: rgba(6, 18, 38, .14);
  border: 1px solid rgba(6, 18, 38, .14);
  align-self: start;
}

.page-about .about-connect__link {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  background: var(--paper-light);
  text-decoration: none;
  color: var(--ink-900);
  transition: background .18s ease, transform .18s ease;
}

.page-about .about-connect__link:hover,
.page-about .about-connect__link:focus-visible {
  background: var(--ink-800);
  color: var(--paper-light);
}

.page-about .about-connect__link:hover .about-connect__link-desc,
.page-about .about-connect__link:focus-visible .about-connect__link-desc,
.page-about .about-connect__link:hover .about-connect__idx,
.page-about .about-connect__link:focus-visible .about-connect__idx {
  color: rgba(191, 247, 242, .82);
}

.page-about .about-connect__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ink-700);
  padding-top: 3px;
  transition: color .18s ease;
}

.page-about .about-connect__link-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-connect__link-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .03em;
}

.page-about .about-connect__link-desc {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(6, 18, 38, .62);
  transition: color .18s ease;
}

.page-about .about-connect__contact {
  margin-top: clamp(30px, 4vw, 48px);
  padding-top: 22px;
  border-top: 1px dashed rgba(6, 18, 38, .24);
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.page-about .about-connect__contact-item {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(6, 18, 38, .82);
}

.page-about .about-connect__contact-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ink-700);
  min-width: 44px;
}

.page-about .about-connect__contact-note {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(6, 18, 38, .6);
  margin-top: 4px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-connect__contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 28px;
  }

  .page-about .about-connect__contact-note {
    grid-column: 1 / -1;
  }
}

@media (min-width: 780px) {
  .page-about .about-reach__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-reach__cell {
    padding: 28px 24px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: clamp(34px, 4.6vw, 68px);
  }

  .page-about .about-stages {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 1px solid var(--line);
  }

  .page-about .about-stage {
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 32px clamp(18px, 2.4vw, 32px) 36px;
  }

  .page-about .about-stage:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-stage:last-child {
    padding-right: 0;
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 20px;
    padding: 24px 0 24px 26px;
    align-items: start;
  }

  .page-about .about-timeline__item::before {
    top: 30px;
  }

  .page-about .about-connect__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-reach__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-reach__cell {
    padding: 26px 18px;
  }

  .page-about .about-team__panel {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__tab,
  .page-about .about-timeline__item,
  .page-about .about-timeline__item::before,
  .page-about .about-connect__link,
  .page-about .about-reach__cell {
    transition: none;
  }

  .page-about #about-team-editorial:checked ~ .about-team__panels .about-team__panel--editorial,
  .page-about #about-team-data:checked ~ .about-team__panels .about-team__panel--data,
  .page-about #about-team-ux:checked ~ .about-team__panels .about-team__panel--ux {
    animation: none;
  }
}
<<<END>>>

等等——不能写 <<<END>>>。那个标记不是允许的。我就只按指定的两个标记输出。

另外，我把 @media (min-width:1100px) 里的 .about-team__panel { display: none; } 去掉，那是个错误残留。删掉。