.page-about {
  background: transparent;
  color: var(--cream);
}

.page-about section[id] {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-head {
  margin-bottom: 28px;
}

.page-about .about-head h2 {
  font-family: var(--font-body);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 10px 0 14px;
  color: var(--cream);
}

.page-about .about-head .lede {
  max-width: 640px;
}

/* ---------- Hero ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(40px, 6vw, 88px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 55% at 82% 18%, rgba(18, 183, 106, .16), transparent 70%),
    radial-gradient(45% 40% at 12% 88%, rgba(70, 227, 208, .1), transparent 72%);
  pointer-events: none;
}

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

.page-about .about-hero .crumbs {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-hero__vertical {
  margin: 0;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--frost);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 0;
  order: -1;
}

.page-about .about-hero__vertical::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--green);
  flex: none;
}

.page-about .about-hero__copy h1 {
  font-family: var(--font-body);
  font-size: clamp(30px, 5.2vw, 56px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.02em;
  margin: 12px 0 20px;
  color: var(--cream);
}

.page-about .about-hero__copy .lede {
  max-width: 560px;
}

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

.page-about .about-hero__scoreboard {
  position: relative;
  justify-self: start;
  width: 100%;
  max-width: 340px;
  padding: 26px 24px 22px;
  background: linear-gradient(160deg, rgba(18, 28, 48, .94), rgba(10, 18, 32, .72));
  border: 1px solid var(--line-strong);
  border-top: 2px solid var(--green);
  clip-path: var(--cut-lg);
  box-shadow: 0 28px 70px -44px rgba(18, 183, 106, .65);
}

.page-about .about-hero__scoreboard::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .scoreboard__label {
  display: block;
  font-size: 10px;
  letter-spacing: .28em;
  color: var(--frost);
}

.page-about .scoreboard__num {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: clamp(76px, 18vw, 124px);
  font-weight: 800;
  line-height: .82;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  color: var(--cyan);
  text-shadow: 0 0 42px rgba(70, 227, 208, .35);
}

.page-about .scoreboard__ruler {
  display: block;
  position: relative;
  height: 24px;
  margin: 16px 0 12px;
  background-image: repeating-linear-gradient(90deg, var(--line-strong) 0 1px, transparent 1px 13px);
  border-bottom: 1px solid var(--line);
}

.page-about .scoreboard__ruler::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 42%;
  border-right: 2px solid var(--orange);
}

.page-about .scoreboard__meta {
  display: block;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--frost);
}

/* ---------- 章节索引 ---------- */

.page-about .about-index {
  border-block: 1px solid var(--line);
  background: rgba(18, 28, 48, .55);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 12px 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--frost);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: border-color .2s ease, color .2s ease, background .2s ease;
}

.page-about .about-index__list a .mono {
  font-size: 11px;
  color: var(--orange);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  border-color: var(--green);
  color: var(--cream);
  background: rgba(18, 183, 106, .1);
}

/* ---------- 起点 ---------- */

.page-about .about-start {
  padding: clamp(44px, 6vw, 88px) 0 clamp(36px, 5vw, 72px);
}

.page-about .about-start__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-start__lead h2 {
  font-family: var(--font-body);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.3;
  margin: 10px 0 18px;
  color: var(--cream);
}

.page-about .about-start__lead p {
  max-width: 640px;
  color: var(--frost);
  font-size: 15.5px;
  line-height: 1.8;
  margin: 0 0 16px;
}

.page-about .paper-card {
  position: relative;
  background: var(--cream);
  color: var(--brown);
  padding: 28px 24px;
  clip-path: var(--cut-lg);
  box-shadow: 0 34px 70px -46px rgba(0, 0, 0, .95);
}

.page-about .paper-card::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--paper-line);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .paper-card__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: rgba(27, 21, 18, .58);
  margin-bottom: 12px;
}

.page-about .paper-card__quote {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  margin: 0 0 16px;
  color: var(--brown);
}

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

.page-about .paper-card__list li {
  position: relative;
  padding: 10px 0 10px 20px;
  font-size: 14.5px;
  line-height: 1.6;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .paper-card__list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .paper-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 10px;
  height: 1px;
  background: var(--brown);
}

/* ---------- 版本时间轴 ---------- */

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

.page-about .about-timeline__media {
  position: relative;
  margin: 0 0 32px;
  border: 1px solid var(--line);
  clip-path: var(--cut-lg);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-timeline__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 18, 32, 0) 38%, rgba(10, 18, 32, .62) 100%);
  pointer-events: none;
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 10px;
  bottom: 10px;
  border-left: 2px dashed var(--line-strong);
}

.page-about .tl__item {
  position: relative;
  padding-left: 48px;
  margin-bottom: 12px;
}

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

.page-about .tl__node {
  position: relative;
  padding: 14px 16px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-color .2s ease, background .2s ease;
}

.page-about .tl__node::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 20px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--green);
  box-shadow: 0 0 0 4px var(--ink), 0 0 16px rgba(18, 183, 106, .7);
}

.page-about .tl__node[open] {
  border-color: var(--line-strong);
  background: rgba(22, 33, 58, .92);
}

.page-about .tl__node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
  color: var(--cream);
}

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

.page-about .tl__node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--cyan);
  flex: none;
  transition: color .2s ease;
}

.page-about .tl__node[open] summary::after {
  content: "−";
  color: var(--orange);
}

.page-about .tl__year {
  flex: none;
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-about .tl__head {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .tl__body {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--frost);
}

/* ---------- 数据来源 ---------- */

.page-about .about-sources {
  padding: clamp(44px, 6vw, 88px) 0;
  border-block: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 28, 48, .78), rgba(10, 18, 32, .2));
}

.page-about .about-sources__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-sources__copy > p {
  max-width: 640px;
  margin: 0 0 22px;
  color: var(--frost);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .source-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .source-list__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px 18px;
  background: rgba(10, 18, 32, .72);
  border: 1px solid var(--line);
  border-left: 2px solid var(--green);
}

.page-about .source-list__num {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .source-list__item strong {
  display: block;
  font-size: 15px;
  color: var(--cream);
  margin-bottom: 6px;
}

.page-about .source-list__item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--frost);
}

.page-about .refresh-strip {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .refresh-strip__cell {
  background: var(--ink);
  padding: 16px 10px;
  text-align: center;
}

.page-about .refresh-strip__big {
  display: block;
  font-size: clamp(22px, 4vw, 28px);
  font-weight: 700;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.page-about .refresh-strip__text {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--frost);
  line-height: 1.5;
}

.page-about .about-sources__figure {
  margin: 0;
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line-strong);
  clip-path: var(--cut-lg);
  overflow: hidden;
}

.page-about .about-sources__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-sources__figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--frost);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding: clamp(44px, 6vw, 88px) 0;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-team__figure {
  margin: 0;
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: var(--cut-lg);
  overflow: hidden;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-team__figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--frost);
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .team-list__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
  padding: 18px 18px 16px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: border-color .2s ease, transform .2s ease;
}

.page-about .team-list__item:hover {
  border-color: var(--green);
  transform: translateY(-2px);
}

.page-about .team-list__count {
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 38px);
  font-weight: 800;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  min-width: 46px;
}

.page-about .team-list__role {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 5px;
}

.page-about .team-list__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--frost);
}

/* ---------- 覆盖与合作 ---------- */

.page-about .about-coverage {
  padding: clamp(44px, 6vw, 88px) 0;
  border-block: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 28, 48, .6), rgba(10, 18, 32, .2));
}

.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: 24px;
}

.page-about .coverage-stat {
  background: var(--ink);
  padding: 18px 16px;
}

.page-about .coverage-stat__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 36px);
  font-weight: 800;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .coverage-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  color: var(--frost);
  line-height: 1.55;
}

.page-about .coverage-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-about .coverage-cell {
  position: relative;
  padding: 16px 14px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  outline: none;
  cursor: default;
  transition: background .25s ease, border-color .25s ease, color .25s ease, transform .25s ease;
}

.page-about .coverage-cell__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .coverage-cell__count {
  font-size: 12px;
  color: var(--green);
  border: 1px solid rgba(18, 183, 106, .45);
  padding: 1px 6px;
  border-radius: 2px;
}

.page-about .coverage-cell__list {
  flex-basis: 100%;
  display: block;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 12px;
  line-height: 1.65;
  color: var(--frost);
  transition: max-height .32s ease, opacity .24s ease, margin-top .24s ease;
}

.page-about .coverage-cell:hover,
.page-about .coverage-cell:focus-visible {
  background: rgba(18, 183, 106, .14);
  border-color: var(--green);
  transform: translateY(-2px);
}

.page-about .coverage-cell:hover .coverage-cell__list,
.page-about .coverage-cell:focus-visible .coverage-cell__list {
  max-height: 90px;
  opacity: 1;
  margin-top: 6px;
}

.page-about .about-coverage__foot {
  margin: 24px 0 0;
  max-width: 700px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--frost);
}

.page-about .about-coverage__foot a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 里程碑 ---------- */

.page-about .about-milestones {
  padding: clamp(44px, 6vw, 88px) 0;
}

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

.page-about .milestone {
  position: relative;
  background: var(--ink);
  padding: 24px 18px;
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 34px;
  height: 2px;
  background: var(--green);
}

.page-about .milestone__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 52px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .milestone__num small {
  font-size: .42em;
  margin-left: 4px;
  color: var(--green);
  font-weight: 700;
}

.page-about .milestone__label {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--frost);
}

.page-about .about-milestones__note {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--frost);
}

.page-about .about-milestones__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 纠错 ---------- */

.page-about .about-corrections {
  padding: clamp(44px, 6vw, 88px) 0 clamp(52px, 7vw, 96px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 28, 48, .8), rgba(10, 18, 32, .1));
}

.page-about .correction-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .correction-step {
  position: relative;
  background: var(--ink);
  padding: 20px 18px 20px 54px;
}

.page-about .correction-step__num {
  position: absolute;
  left: 16px;
  top: 20px;
  font-size: 13px;
  color: var(--orange);
  letter-spacing: .06em;
}

.page-about .correction-step__title {
  display: block;
  font-size: 15px;
  color: var(--cream);
  margin-bottom: 6px;
}

.page-about .correction-step__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--frost);
}

.page-about .about-corrections__contact {
  margin-top: 28px;
  padding: 24px 22px;
  border: 1px solid var(--line-strong);
  border-left: 2px solid var(--orange);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  background: var(--ink-2);
  display: grid;
  gap: 20px;
}

.page-about .about-corrections__contact-copy p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--frost);
}

.page-about .about-corrections__contact-line {
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: .02em;
  word-break: break-word;
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .coverage-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: end;
  }

  .page-about .about-hero__vertical {
    position: absolute;
    left: -26px;
    top: 4px;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    letter-spacing: .3em;
    padding: 0;
  }

  .page-about .about-hero__vertical::before {
    display: none;
  }

  .page-about .about-hero__scoreboard {
    justify-self: end;
  }

  .page-about .about-start__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-start__paper {
    margin-top: 24px;
    transform: rotate(-1.2deg);
  }

  .page-about .tl::before {
    left: 87px;
  }

  .page-about .tl__item {
    padding-left: 136px;
  }

  .page-about .tl__node::before {
    left: -55px;
  }

  .page-about .tl__node {
    padding: 16px 20px;
  }

  .page-about .about-sources__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 56px);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 48px);
    align-items: center;
  }

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

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

  .page-about .about-corrections__contact {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 26px 28px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__grid {
    padding-left: 18px;
  }
}

@media (hover: none) {
  .page-about .coverage-cell__list {
    max-height: none;
    opacity: 1;
    margin-top: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .coverage-cell,
  .page-about .coverage-cell__list,
  .page-about .team-list__item,
  .page-about .tl__node,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .about-start__paper {
    transform: none;
  }
}
<<<END>>>