.page-about {
  --about-rail: 210px;
  --about-gap: clamp(24px, 4vw, 56px);
}

.page-about .about-hero {
  position: relative;
  padding-block: clamp(44px, 7vw, 96px) clamp(36px, 5vw, 64px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 82% 18%, rgba(201, 162, 39, 0.14), transparent 42%),
    repeating-linear-gradient(90deg, transparent 0 118px, rgba(201, 162, 39, 0.06) 118px 119px);
  opacity: 0.9;
}

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

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  align-items: center;
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .about-hero__emblem {
  display: block;
  width: 54px;
  height: 54px;
  color: var(--gold);
  margin-bottom: 18px;
}

.page-about .about-hero__copy .display-1 {
  max-width: 16ch;
  margin-bottom: 20px;
}

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

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

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

.page-about .about-hero__figure .media {
  border: 1px solid var(--line);
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: clamp(32px, 5vw, 52px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-stat__label {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-3);
  font-weight: 500;
  line-height: 1;
  color: var(--gold-soft);
}

.page-about .about-body {
  display: grid;
  gap: 0;
  align-items: start;
}

.page-about .about-rail {
  padding-block: 22px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.12em;
  color: var(--gold);
}

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 10px;
  color: var(--paper-dim);
  text-decoration: none;
  font-size: var(--step--1);
  border: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-color: var(--line);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  color: var(--gold);
  letter-spacing: 0.04em;
}

.page-about .about-rail__top {
  display: none;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-chapter {
  padding-block: clamp(40px, 6vw, 76px);
  padding-inline: clamp(18px, 3vw, 40px);
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-chapter__head .kicker {
  margin: 0;
}

.page-about .about-chapter h2 {
  margin: 0 0 18px;
}

.page-about .about-chapter__lead {
  max-width: 64ch;
  margin: 0 0 30px;
}

.page-about .about-split {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-prose p {
  margin: 0 0 1em;
}

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

.page-about .about-aside {
  padding-left: 20px;
  border-left: 1px solid var(--line);
}

.page-about .about-aside__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.06em;
  color: var(--gold);
}

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

.page-about .about-aside__item {
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--mist);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(var(--gold), var(--line-soft));
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: 28px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border: 1px solid var(--gold);
  background: var(--royal-900);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  color: var(--gold-soft);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--step-1);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--paper-dim);
}

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

.page-about .about-figure .media {
  border: 1px solid var(--line-soft);
}

.page-about .about-figure .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .about-team {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-team__item {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-team__count {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-3);
  font-weight: 500;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-team__role {
  margin: 8px 0 4px;
  font-family: var(--font-display);
  font-size: var(--step-1);
}

.page-about .about-team__desc {
  margin: 6px 0 0;
  font-size: var(--step--1);
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-details {
  margin-top: 28px;
  border: 1px solid var(--line);
  background: rgba(23, 54, 78, 0.24);
}

.page-about .about-details__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.02em;
  color: var(--gold-soft);
}

.page-about .about-details__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-details__summary::after {
  content: "+";
  font-size: 1.2em;
  line-height: 1;
}

.page-about .about-details[open] .about-details__summary::after {
  content: "−";
}

.page-about .about-details__body {
  padding: 0 18px 18px;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--paper-dim);
}

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

.page-about .about-governance-list__item {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-governance-list__term {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-governance-list__desc {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--paper-dim);
}

.page-about .about-audience {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

.page-about .about-audience__item {
  padding: 22px;
  background: rgba(23, 54, 78, 0.5);
  border-left: 2px solid var(--lake);
}

.page-about .about-audience__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--step-1);
}

.page-about .about-audience__text {
  margin: 0 0 12px;
  font-size: var(--step--1);
  line-height: 1.7;
}

.page-about .about-audience__link {
  display: inline-block;
  font-size: var(--step--1);
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .about-audience__link:hover,
.page-about .about-audience__link:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

.page-about .about-promise {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-promise__item {
  padding-top: 16px;
  border-top: 1px solid var(--gold);
}

.page-about .about-promise__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--step-1);
}

.page-about .about-promise__text {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--paper-dim);
}

.page-about .about-service-note {
  margin: 30px 0 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-service-note a {
  color: var(--gold-soft);
}

.page-about .about-partners {
  display: grid;
  gap: 18px;
  margin-top: 28px;
}

.page-about .about-partners__item {
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-partners__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--step-1);
}

.page-about .about-partners__text {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.7;
}

.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* 纸白章节内的局部配色调整 */
.page-about .about-chapter.band--paper .about-aside {
  border-left-color: rgba(10, 26, 42, 0.18);
}

.page-about .about-chapter.band--paper .about-aside__title {
  color: var(--amber-ink);
}

.page-about .about-chapter.band--paper .about-aside__item,
.page-about .about-chapter.band--paper .about-team__desc,
.page-about .about-chapter.band--paper .about-audience__text,
.page-about .about-chapter.band--paper .about-partners__text {
  color: rgba(10, 26, 42, 0.76);
}

.page-about .about-chapter.band--paper .about-team__count {
  color: var(--amber-ink);
}

.page-about .about-chapter.band--paper .about-audience__item {
  background: rgba(10, 26, 42, 0.045);
}

.page-about .about-chapter.band--paper .about-audience__link {
  color: var(--amber-ink);
  border-bottom-color: rgba(10, 26, 42, 0.28);
}

.page-about .about-chapter.band--paper .about-details {
  background: rgba(10, 26, 42, 0.04);
}

.page-about .about-chapter.band--paper .about-details__summary {
  color: var(--amber-ink);
}

.page-about .about-chapter.band--paper .about-details__body {
  color: rgba(10, 26, 42, 0.8);
}

.page-about .about-chapter.band--paper .about-figure__caption {
  color: rgba(10, 26, 42, 0.6);
}

@media (min-width: 640px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-governance-list__item {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-split--rev {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

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

  .page-about .about-audience__item {
    display: flex;
    flex-direction: column;
  }

  .page-about .about-audience__link {
    margin-top: auto;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-hero__copy .display-1 {
    max-width: 15ch;
  }

  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    padding-block: clamp(40px, 6vw, 76px);
    padding-right: 18px;
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

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

  .page-about .about-rail__link {
    white-space: normal;
    padding: 8px 0 8px 12px;
    border: 0;
    border-left: 2px solid transparent;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--gold);
    border-bottom-color: transparent;
  }

  .page-about .about-rail__top {
    display: inline-block;
    margin-top: 22px;
  }

  .page-about .about-chapter {
    padding-inline: clamp(28px, 4vw, 56px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link {
    transition: none;
  }
}
<<<END>>>