.page-about {
  --about-rail: 210px;
  --about-gap: clamp(32px, 5vw, 80px);
  padding-bottom: clamp(72px, 10vw, 128px);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: clamp(16px, 3vw, 28px) 0 0;
  list-style: none;
}

.page-about .about-crumb-list .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: 10px;
  color: var(--surf);
}

.page-about .about-crumb-list a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) ease, color var(--t-fast) ease;
}

.page-about .about-crumb-list a:hover,
.page-about .about-crumb-list a:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold-hi);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(28px, 4vw, 40px);
  padding-block: clamp(28px, 4vw, 52px) clamp(40px, 6vw, 76px);
}

.page-about .about-eyebrow {
  margin: 0;
  color: var(--gold);
}

.page-about .about-title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(46px, 10vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-lede {
  max-width: 36em;
  margin: 22px 0 0;
  font-size: clamp(17px, 2vw, 19px);
  line-height: 1.9;
  color: var(--paper);
}

.page-about .about-lede-sub {
  max-width: 34em;
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero-figure {
  margin: 0;
}

.page-about .about-hero-figure .figure-frame {
  border: var(--line);
  background: var(--trench);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
    gap: clamp(40px, 5vw, 72px);
  }
}

/* ---------- 主体骨架：左侧编年索引 + 右侧正文 ---------- */
.page-about .about-shell {
  display: grid;
  gap: var(--about-gap);
  border-top: var(--line);
  padding-top: clamp(28px, 4vw, 52px);
}

@media (min-width: 1020px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

/* ---------- 编年索引 ---------- */
.page-about .about-rail-title {
  margin: 0 0 14px;
  color: var(--gold);
}

.page-about .about-rail-list {
  margin: 0;
  padding: 0 0 0 4px;
  list-style: none;
  border-left: 1px solid var(--surf);
}

.page-about .about-rail-list li {
  position: relative;
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr);
  gap: 0 8px;
  padding: 10px 0 10px 18px;
}

.page-about .about-rail-list li::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 17px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--deep);
  border: 1px solid var(--gold);
}

.page-about .about-rail-list li.is-current::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(217, 166, 75, 0.16);
}

.page-about .about-rail-list a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) ease;
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  border-bottom-color: var(--gold-hi);
}

.page-about .about-rail-list span {
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-rail-foot {
  margin: 18px 0 0;
  padding-left: 18px;
  font-size: 12px;
  line-height: 1.75;
  color: var(--mist);
  border-left: 1px solid var(--surf);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: clamp(40px, 6vw, 72px);
  border-top: var(--line);
}

.page-about .about-body > .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec .section-head {
  margin-bottom: clamp(22px, 3vw, 36px);
}

.page-about .about-text p {
  max-width: 60ch;
  margin: 0 0 1.15em;
  font-size: 17px;
  line-height: 1.9;
  color: var(--paper);
}

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

.page-about .about-text a {
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 206, 134, 0.45);
  transition: border-color var(--t-fast) ease;
}

.page-about .about-text a:hover,
.page-about .about-text a:focus-visible {
  border-bottom-color: var(--gold-hi);
}

/* ---------- 旁注 ---------- */
.page-about .about-side {
  margin: 26px 0 0 auto;
  max-width: 34ch;
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  font-size: 13px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-cols {
  display: grid;
  gap: 24px;
}

@media (min-width: 760px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1fr) minmax(0, 17rem);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }
}

/* ---------- 栏目职责定义列表 ---------- */
.page-about .about-defs {
  margin: 0;
}

.page-about .about-def {
  padding: 22px 0;
  border-top: var(--line);
}

.page-about .about-def:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-def.is-key {
  padding-left: 18px;
  border-left: 2px solid var(--gold);
  background: linear-gradient(90deg, rgba(217, 166, 75, 0.09), rgba(217, 166, 75, 0) 62%);
}

.page-about .about-def dt {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 24px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-def dd {
  max-width: 64ch;
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-source {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(20px, 3vw, 28px);
  border: var(--line);
  border-left: 3px solid var(--cinnabar);
  background: var(--trench);
}

.page-about .about-source-title {
  margin: 0 0 10px;
  color: var(--cinnabar);
}

.page-about .about-source p:last-child {
  max-width: 68ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 版本编年 ---------- */
.page-about .about-span-figure {
  margin: 0 0 clamp(30px, 4vw, 48px);
}

.page-about .about-span-figure .figure-frame {
  border: var(--line);
  background: var(--trench);
  overflow: hidden;
}

.page-about .about-span-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 8 / 3;
  object-fit: cover;
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 16px;
  width: 1px;
  background: var(--surf);
}

.page-about .about-era {
  position: relative;
  padding: 0 0 clamp(30px, 4vw, 44px) 34px;
}

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

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--deep);
  border: 2px solid var(--gold);
}

.page-about .about-era.is-current::before {
  background: var(--gold);
}

.page-about .about-era-num {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-era-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 26px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-era-text {
  max-width: 62ch;
  margin: 10px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--paper);
}

.page-about .about-era-text a {
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 206, 134, 0.45);
}

.page-about .about-era-text a:hover,
.page-about .about-era-text a:focus-visible {
  border-bottom-color: var(--gold-hi);
}

.page-about .about-era-note {
  position: relative;
  max-width: 60ch;
  margin: 12px 0 0;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-era-note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 9px;
  height: 1px;
  background: var(--cinnabar);
}

/* ---------- 编辑分工与三校流程 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 19rem);
    align-items: start;
    gap: clamp(32px, 4vw, 56px);
  }
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--surf);
  border: var(--line);
}

@media (min-width: 620px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 14px;
  align-content: start;
  padding: 18px;
  background: var(--deep);
}

.page-about .about-roles-num {
  grid-row: span 2;
  font-size: 32px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-roles-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-roles-desc {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-flow-wrap {
  margin-top: clamp(30px, 4vw, 46px);
}

.page-about .about-flow-title {
  margin: 0 0 18px;
  color: var(--mist);
}

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

.page-about .about-flow-step::before {
  content: "";
  display: block;
  width: 12px;
  height: 12px;
  margin-bottom: 14px;
  background: var(--trench);
  border: 1px solid var(--gold);
}

.page-about .about-flow-index {
  margin: 0;
  color: var(--cinnabar);
}

.page-about .about-flow-step h3 {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 19px;
  color: var(--paper);
}

.page-about .about-flow-step p:last-child {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-flow-step {
    padding: 0 clamp(16px, 2vw, 26px);
    border-left: var(--line);
  }

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

.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-team-figure .figure-frame {
  border: var(--line);
  background: var(--trench);
  overflow: hidden;
}

.page-about .about-team-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

/* ---------- 更正流程 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--surf);
  border-top: var(--line);
}

.page-about .about-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 20px 4px;
  background: var(--deep);
}

.page-about .about-steps-num {
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--cinnabar);
}

.page-about .about-steps h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper);
}

.page-about .about-steps p {
  max-width: 62ch;
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-steps a {
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 206, 134, 0.45);
}

.page-about .about-steps a:hover,
.page-about .about-steps a:focus-visible {
  border-bottom-color: var(--gold-hi);
}

.page-about .about-contact {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(20px, 3vw, 28px);
  border: var(--line);
  border-left: 3px solid var(--gold);
  background: var(--trench);
}

.page-about .about-contact-title {
  margin: 0 0 10px;
  color: var(--gold);
}

.page-about .about-contact p:last-child {
  max-width: 68ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.95;
  color: var(--paper);
}

.page-about .about-contact a {
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 206, 134, 0.45);
}

.page-about .about-contact a:hover,
.page-about .about-contact a:focus-visible {
  border-bottom-color: var(--gold-hi);
}

/* ---------- 回到顶部按钮的页内定位 ---------- */
.page-about .to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
  background: rgba(4, 18, 30, 0.88);
  border: var(--line);
  text-transform: uppercase;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail-list a,
  .page-about .about-text a,
  .page-about .about-crumb-list a,
  .page-about .about-steps a,
  .page-about .about-contact a {
    transition: none;
  }
}
<<<END>>>