.page-about {
  --about-sec: clamp(44px, 6vw, 88px);
  background: var(--sand);
  color: var(--ink);
}

/* ---------- 封面层 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin-top: calc(var(--header-h) * -1);
  padding-top: calc(var(--header-h) + clamp(44px, 7vw, 92px));
  padding-bottom: clamp(44px, 6vw, 80px);
  background:
    radial-gradient(130% 100% at 92% 2%, rgba(19, 87, 216, 0.72) 0%, rgba(19, 87, 216, 0) 62%),
    linear-gradient(155deg, #0B1730 0%, #12294F 58%, #0B1730 100%);
  color: var(--white);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: repeating-linear-gradient(118deg, rgba(255, 255, 255, 0.055) 0 1px, transparent 1px 28px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -110px;
  bottom: -140px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  z-index: -1;
  background: radial-gradient(circle, rgba(255, 107, 74, 0.5), rgba(255, 107, 74, 0) 68%);
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(26px, 5vw, 54px);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.62);
}

.page-about .about-crumbs a {
  color: rgba(255, 255, 255, 0.86);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--coral);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
}

.page-about .about-hero__lead h1 {
  margin: 16px 0 0;
  font-size: clamp(2.35rem, 6.2vw, 5.2rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
  font-weight: 900;
}

.page-about .about-hero__lede {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.2vw, 1.125rem);
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-hero__note {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.26em;
  line-height: 2;
  color: rgba(255, 255, 255, 0.55);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(14px, 3vw, 32px);
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 0;
}

.page-about .about-facts__item {
  padding: 14px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  min-width: 0;
}

.page-about .about-facts dt {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: rgba(255, 255, 255, 0.6);
}

.page-about .about-facts dd {
  margin: 8px 0 0;
  font-size: clamp(1.45rem, 3vw, 2.15rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-body {
  padding-block: var(--about-sec);
}

.page-about .about-layout {
  display: grid;
  gap: clamp(26px, 4vw, 62px);
}

.page-about .about-toc {
  border-top: 2px solid var(--navy);
  padding-top: 14px;
  min-width: 0;
}

.page-about .about-toc__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-soft);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-toc__list .mono {
  font-size: 11px;
  color: var(--coral);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--blue);
  border-bottom-color: var(--blue);
}

.page-about .about-toc__cta {
  display: inline-block;
  margin-top: 16px;
  font-size: 13px;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 2px solid var(--coral);
  padding-bottom: 3px;
}

.page-about .about-toc__cta:hover,
.page-about .about-toc__cta:focus-visible {
  color: var(--coral-deep);
}

/* ---------- 章节正文 ---------- */
.page-about .about-chapters {
  min-width: 0;
}

.page-about .chapter {
  border-top: 1px solid var(--line);
  padding-top: clamp(22px, 3.4vw, 34px);
}

.page-about .chapter + .chapter {
  margin-top: clamp(46px, 7vw, 92px);
}

.page-about .chapter__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 22px);
}

.page-about .chapter-no {
  flex: none;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 0.92;
}

.page-about .chapter h2 {
  margin: 0;
  font-size: clamp(1.55rem, 3.4vw, 2.6rem);
  line-height: 1.14;
  letter-spacing: -0.025em;
  font-weight: 800;
}

.page-about .chapter__body {
  margin-top: clamp(16px, 2.4vw, 26px);
  max-width: 40em;
}

.page-about .chapter__body p {
  margin: 0 0 1em;
  font-size: clamp(1rem, 1.1vw, 1.0625rem);
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .chapter__body .chapter__lede {
  font-size: clamp(1.0625rem, 1.5vw, 1.25rem);
  line-height: 1.72;
  color: var(--ink);
  font-weight: 500;
}

.page-about .chapter__body strong {
  color: var(--ink);
  font-weight: 700;
}

.page-about .chapter__sub {
  margin: clamp(26px, 4vw, 40px) 0 0;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  letter-spacing: -0.01em;
}

.page-about .chapter__tail {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--teal);
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .chapter__note {
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--coral);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3.2vw, 32px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--mist);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* ---------- 团队分工 ---------- */
.page-about .team-list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .team-item {
  display: grid;
  gap: 4px 16px;
  padding: clamp(15px, 2.2vw, 22px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .team-item__no {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-about .team-item h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .team-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .team-item__meta {
  margin: 6px 0 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--coral-deep);
}

/* ---------- 城市网络 ---------- */
.page-about .about-cities {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(14px, 3vw, 28px);
}

.page-about .about-cities li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.9375rem;
  color: var(--ink);
  min-width: 0;
  transition: color var(--t-fast) var(--ease);
}

.page-about .city-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  transition: transform var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .about-cities li:hover {
  color: var(--blue);
}

.page-about .about-cities li:hover .city-dot {
  transform: scale(1.6);
  background: var(--coral);
}

.page-about .coop-list {
  list-style: none;
  margin: clamp(14px, 2vw, 20px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .coop-list li {
  padding-left: 16px;
  border-left: 2px solid var(--line);
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .coop-list li:hover {
  border-left-color: var(--blue);
}

.page-about .coop-list h4 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
}

.page-about .coop-list p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue) 0%, var(--teal) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-left: clamp(28px, 4vw, 38px);
  padding-bottom: clamp(22px, 3vw, 32px);
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--navy);
  border: 2px solid var(--navy);
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .tl-item:hover::before {
  transform: scale(1.4);
  background: var(--coral);
  border-color: var(--coral);
}

.page-about .tl-item__year {
  display: block;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--blue);
}

.page-about .tl-item__body {
  margin-top: 8px;
  max-width: 36em;
}

.page-about .tl-item__body h3 {
  margin: 0 0 6px;
  font-size: 1.0625rem;
  font-weight: 700;
}

.page-about .tl-item__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-rules li {
  background: var(--white);
  padding: clamp(15px, 2.2vw, 22px);
}

.page-about .about-rules h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.page-about .about-rules p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 交流与荣誉 ---------- */
.page-about .about-honors {
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(22px, 3.4vw, 36px);
  background: var(--navy);
  color: var(--white);
  border-radius: var(--radius);
}

.page-about .about-honors__label {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--teal);
}

.page-about .about-honors__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-honors__list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9688rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-honors__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--coral);
}

.page-about .about-honors__list strong {
  color: var(--white);
}

.page-about .about-honors__foot {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  font-size: 0.875rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.66);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  background: var(--white);
  border-top: 3px solid var(--blue);
  padding-block: clamp(40px, 6vw, 76px);
}

.page-about .about-next h2 {
  margin: 14px 0 0;
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  line-height: 1.16;
  letter-spacing: -0.025em;
  max-width: 22em;
}

.page-about .about-next__lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 38em;
  font-size: clamp(1rem, 1.1vw, 1.0625rem);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---------- 响应式 ---------- */
@media (max-width: 959px) {
  .page-about .about-toc__list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 18px;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .page-about .about-toc__list a {
    padding: 4px 0;
    border-bottom: none;
    white-space: nowrap;
  }

  .page-about .about-toc__cta {
    margin-top: 8px;
  }
}

@media (min-width: 640px) {
  .page-about .about-cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 720px) {
  .page-about .team-item {
    grid-template-columns: 34px minmax(0, 1fr) auto;
    align-items: start;
  }

  .page-about .team-item__meta {
    margin-top: 3px;
    text-align: right;
    white-space: nowrap;
  }

  .page-about .coop-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 26px) clamp(18px, 3vw, 32px);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 3fr);
    align-items: end;
  }

  .page-about .about-hero__note {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    justify-self: end;
    padding-inline-start: 16px;
    border-inline-start: 1px solid rgba(255, 255, 255, 0.24);
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: minmax(184px, 220px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .chapter h2 {
    max-width: 18em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .city-dot,
  .page-about .tl-item::before,
  .page-about .coop-list li,
  .page-about .about-toc__list a {
    transition: none;
  }
}
<<<END>>>