.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-wrap: break-word;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: calc(var(--header-h) + 44px) 0 0;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 68% at 84% 16%, rgba(201, 162, 39, 0.20), transparent 62%),
    radial-gradient(42% 54% at 6% 94%, rgba(178, 34, 34, 0.13), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
  padding-bottom: 44px;
}

.page-about .about-eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--gold);
}

.page-about .about-h1 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(27px, 6.4vw, 46px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.page-about .about-lede {
  margin: 20px 0 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.88;
  color: rgba(243, 244, 241, 0.78);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-media {
  margin: 0;
  border: 1px solid var(--rule-gold);
  border-radius: calc(var(--radius) + 8px);
  overflow: hidden;
  background: var(--graphite);
  box-shadow: 0 24px 60px -34px rgba(201, 162, 39, 0.55);
}

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

.page-about .about-stats {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--rule-gold);
}

.page-about .about-stat {
  padding: 20px 18px 22px 0;
  border-bottom: 1px solid rgba(243, 244, 241, 0.10);
  border-right: 1px solid rgba(243, 244, 241, 0.10);
  padding-left: 18px;
}

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

.page-about .stat-num {
  display: block;
  font-size: 21px;
  line-height: 1.2;
  color: var(--gold);
  letter-spacing: 0.02em;
  padding-bottom: 6px;
  margin-bottom: 6px;
  border-bottom: 2px solid rgba(201, 162, 39, 0.55);
  width: max-content;
}

.page-about .stat-label {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(243, 244, 241, 0.62);
}

/* ---------- 分屏骨架 ---------- */
.page-about .about-split {
  display: grid;
  gap: 34px;
  padding-top: 52px;
  padding-bottom: 68px;
}

.page-about .about-toc {
  border-top: 2px solid var(--gold);
  padding-top: 16px;
}

.page-about .about-toc-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--stone);
}

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

.page-about .about-toc-list::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc-list li {
  flex: 0 0 auto;
}

.page-about .about-toc-list a {
  display: block;
  padding: 6px 14px;
  border: 1px solid rgba(17, 17, 17, 0.13);
  border-radius: 999px;
  color: #3a3e41;
  font-size: 13.5px;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-toc-list a:hover,
.page-about .about-toc-list a:focus-visible {
  border-color: var(--gold);
  color: var(--gold-deep);
  background: rgba(201, 162, 39, 0.10);
}

.page-about .about-toc-list a.is-current {
  border-color: var(--gold);
  background: rgba(201, 162, 39, 0.14);
  color: var(--ink);
  font-weight: 500;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-about .about-section + .about-section {
  margin-top: 56px;
}

.page-about .about-section .section-head {
  margin-bottom: 22px;
}

.page-about .about-section .eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--gold-deep);
}

.page-about .about-section .section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 4.4vw, 29px);
  line-height: 1.38;
  letter-spacing: -0.004em;
  color: var(--ink);
}

.page-about .about-section .lede {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.85;
  color: #4a4f52;
}

.page-about .about-p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.86;
  color: #2c2f31;
}

.page-about .about-p--tight {
  margin-top: 22px;
}

.page-about .about-tagrow {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .about-more {
  margin: 20px 0 0;
}

.page-about .link-gold {
  display: inline-block;
  font-size: 14.5px;
  color: var(--gold-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-gold);
  padding-bottom: 3px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .link-gold:hover,
.page-about .link-gold:focus-visible {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
}

/* ---------- 常设栏目 ---------- */
.page-about .about-columns {
  display: grid;
  gap: 16px;
}

.page-about .col-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 22px 20px;
  background: var(--paper-warm);
  border-radius: calc(var(--radius) + 4px);
  border-top: 3px solid var(--gold);
}

.page-about .col-card--moss {
  border-top-color: var(--moss);
}

.page-about .col-card--clay {
  border-top-color: var(--clay);
}

.page-about .col-index {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--stone);
}

.page-about .col-card h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .col-card > p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: #3a3e41;
}

.page-about .col-card .fold {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed rgba(17, 17, 17, 0.18);
}

.page-about .col-card .fold-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #4a4f52;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 26px;
}

.page-about .team-media {
  margin: 0;
  border: 1px solid var(--rule-gold);
  border-radius: calc(var(--radius) + 4px);
  overflow: hidden;
  background: var(--graphite);
}

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

.page-about .team-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .team-role {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid rgba(17, 17, 17, 0.10);
}

.page-about .team-role:last-child {
  border-bottom: 1px solid rgba(17, 17, 17, 0.10);
}

.page-about .team-role-num {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--gold-deep);
  padding-top: 4px;
}

.page-about .team-role h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .team-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: #3a3e41;
}

/* ---------- 版本演进 ---------- */
.page-about .timeline-media {
  margin: 0 0 26px;
  border: 1px solid rgba(17, 17, 17, 0.10);
  border-radius: calc(var(--radius) + 4px);
  overflow: hidden;
  background: var(--graphite);
}

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

.page-about .about-timeline-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 26px;
}

.page-about .about-timeline-index a {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.05em;
  padding: 6px 13px;
  border: 1px solid rgba(17, 17, 17, 0.14);
  border-radius: 999px;
  color: #3a3e41;
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-timeline-index a:hover,
.page-about .about-timeline-index a:focus-visible {
  border-color: var(--gold);
  color: var(--gold-deep);
  background: rgba(201, 162, 39, 0.12);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 39, 0.16) 100%);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 34px 32px;
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--gold);
  box-sizing: border-box;
}

.page-about .tl-node {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: 8px;
}

.page-about .tl-version {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: rgba(201, 162, 39, 0.16);
  border-bottom: 2px solid var(--gold);
  padding: 2px 8px;
}

.page-about .tl-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .tl-text {
  margin: 0;
  max-width: 58ch;
  font-size: 14.8px;
  line-height: 1.84;
  color: #3a3e41;
}

/* ---------- 设备适配 ---------- */
.page-about .about-section--warm {
  background: var(--paper-warm);
  border-radius: calc(var(--radius) + 6px);
  padding: 28px 22px 30px;
}

.page-about .about-figures {
  display: grid;
  gap: 2px;
  background: rgba(17, 17, 17, 0.10);
  border-top: 1px solid var(--rule-gold);
  border-bottom: 1px solid var(--rule-gold);
}

.page-about .figure-cell {
  background: var(--paper-warm);
  padding: 20px 18px;
}

.page-about .figure-num {
  display: block;
  width: max-content;
  font-size: 30px;
  line-height: 1.1;
  color: var(--gold-deep);
  letter-spacing: 0.02em;
  padding-bottom: 6px;
  margin-bottom: 10px;
  border-bottom: 2px solid var(--gold);
}

.page-about .figure-label {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: #3a3e41;
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promise {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .promise-item {
  display: grid;
  gap: 8px;
  padding: 20px 0 20px 18px;
  border-top: 1px solid rgba(17, 17, 17, 0.10);
  border-left: 2px solid rgba(201, 162, 39, 0.45);
}

.page-about .promise-item:last-child {
  border-bottom: 1px solid rgba(17, 17, 17, 0.10);
}

.page-about .promise-key {
  font-size: 13.5px;
  letter-spacing: 0.06em;
  color: var(--gold-deep);
}

.page-about .promise-item p {
  margin: 0;
  max-width: 60ch;
  font-size: 14.8px;
  line-height: 1.84;
  color: #3a3e41;
}

/* ---------- 地域与备案 ---------- */
.page-about .about-region-card {
  background: var(--paper-warm);
  border: 1px solid rgba(17, 17, 17, 0.10);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius);
  padding: 24px 22px;
}

.page-about .region-list {
  margin: 0;
  display: grid;
  gap: 16px;
}

.page-about .region-row {
  display: grid;
  gap: 4px;
}

.page-about .region-list dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-about .region-list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
}

.page-about .region-note {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(17, 17, 17, 0.10);
  font-size: 14.5px;
  line-height: 1.84;
  color: #3a3e41;
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  margin-top: 60px;
  padding: 30px 24px;
  background: var(--graphite);
  border-radius: calc(var(--radius) + 6px);
  display: grid;
  gap: 22px;
  border-top: 2px solid var(--gold);
}

.page-about .about-cta h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 4vw, 25px);
  font-weight: 700;
  line-height: 1.42;
  color: #ffffff;
}

.page-about .about-cta p {
  margin: 10px 0 0;
  max-width: 52ch;
  font-size: 14.8px;
  line-height: 1.84;
  color: rgba(243, 244, 241, 0.74);
}

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

/* ---------- 桌面端 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stat:nth-child(2n) {
    border-right: 1px solid rgba(243, 244, 241, 0.10);
  }

  .page-about .about-stat:last-child {
    border-right: 0;
  }

  .page-about .about-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .region-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 26px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
    padding: 34px 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 64px);
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: center;
    gap: 56px;
    padding-bottom: 60px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
    gap: 38px;
  }

  .page-about .about-section--warm {
    padding: 34px 32px 36px;
  }
}

@media (min-width: 981px) {
  .page-about .about-split {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 58px;
    padding-top: 78px;
    padding-bottom: 96px;
  }

  .page-about .about-split > .split-aside {
    position: sticky;
    top: calc(var(--header-h) + 30px);
  }

  .page-about .about-toc-list {
    display: grid;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc-list a {
    border: 0;
    border-left: 2px solid rgba(17, 17, 17, 0.12);
    border-radius: 0;
    padding: 8px 0 8px 14px;
    white-space: normal;
    font-size: 14.5px;
  }

  .page-about .about-toc-list a:hover,
  .page-about .about-toc-list a:focus-visible {
    background: transparent;
    border-left-color: var(--gold);
    color: var(--ink);
  }

  .page-about .about-toc-list a.is-current {
    background: transparent;
    border-left-color: var(--cinnabar);
    padding-left: 18px;
    color: var(--ink);
  }

  .page-about .about-section + .about-section {
    margin-top: 84px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc-list a,
  .page-about .about-timeline-index a,
  .page-about .link-gold {
    transition: none;
  }
}
<<<END>>>

我输出的是两个标记： 和  各一次，没有加 Markdown 代码围栏。HTML 里只有一个 h1，用了面包屑式的侧栏索引和锚点导航，所有 href 要么指向站内合法路由，要么指向页面内真实存在的 id。CSS 全部限定在 .page-about 作用域里，移动端做了目录横滑和栅格降级，桌面端是 232px 粘性侧栏 + 主内容的两栏骨架。三张图片用了占位协议并覆盖首屏、团队、时间轴三个位置。