.page-about {
  --about-rule: 1px solid var(--line-soft);
  --about-gap: clamp(3.5rem, 7vw, 6.5rem);
  display: block;
  background: var(--ink-900);
  color: var(--text);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .breadcrumb {
  padding-top: clamp(1.25rem, 3vw, 2rem);
  padding-bottom: clamp(.5rem, 1.5vw, 1rem);
}

.page-about .breadcrumb__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  font-size: .8125rem;
  color: var(--muted);
  letter-spacing: .06em;
}

.page-about .breadcrumb__list li[aria-current="page"] {
  color: var(--cyan);
}

.page-about .breadcrumb__link {
  border-bottom: 1px solid transparent;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(2rem, 5vw, 3.5rem) 0 clamp(3rem, 8vw, 6rem);
  background:
    radial-gradient(115% 85% at 8% 0%, rgba(18, 70, 62, .9) 0%, rgba(10, 14, 12, 0) 62%),
    linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--line) 42%, transparent 100%);
  opacity: .65;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 9vw, 6.4rem);
  line-height: 1.02;
  letter-spacing: .01em;
  margin: .75rem 0 1.25rem;
  color: var(--text);
}

.page-about .about-hero__lede {
  max-width: 40ch;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.9;
  color: var(--text);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem clamp(1rem, 3vw, 2rem);
  margin: clamp(2.25rem, 5vw, 3.5rem) 0 0;
  padding: clamp(1.5rem, 3vw, 2rem) 0 0;
  border-top: var(--about-rule);
  list-style: none;
}

.page-about .about-hero__fact-value {
  display: block;
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__fact-label {
  display: block;
  margin-top: .4rem;
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 通用小注 ---------- */

.page-about .about-note {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding-top: 1.25rem;
  border-top: var(--about-rule);
  max-width: 62ch;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-note a {
  color: var(--cyan);
  border-bottom-color: rgba(63, 224, 200, .45);
}

/* ---------- 站台做什么 ---------- */

.page-about .about-audience {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.5rem);
  margin-top: clamp(2rem, 5vw, 3.25rem);
}

.page-about .audience {
  padding-top: 1.4rem;
  border-top: 2px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}

.page-about .audience:hover {
  border-top-color: var(--cyan);
}

.page-about .audience__name {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .audience p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 赛季刻度带 ---------- */

.page-about .era-band {
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
  background: var(--ink-800);
}

.page-about .era-band__list {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .era-band__list::-webkit-scrollbar {
  display: none;
}

.page-about .era-tick {
  display: block;
  flex: 0 0 auto;
  min-width: 8.25rem;
  padding: 1.1rem 1.25rem 1.25rem;
  border-right: var(--about-rule);
  border-bottom: 2px solid transparent;
  color: var(--muted);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .era-tick:hover,
.page-about .era-tick:focus-visible {
  color: var(--cyan);
  background: rgba(63, 224, 200, .07);
  border-bottom-color: var(--cyan);
}

.page-about .era-tick__year {
  display: block;
  font-size: 1.25rem;
  line-height: 1.2;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

.page-about .era-tick__label {
  display: block;
  margin-top: .35rem;
  font-size: .75rem;
  letter-spacing: .08em;
  color: inherit;
}

/* ---------- 沿革横幅 ---------- */

.page-about .era-banner {
  margin: clamp(2.5rem, 6vw, 4rem) 0 0;
}

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

.page-about .era-banner .media__frame,
.page-about .team-banner .media__frame,
.page-about .network__media .media__frame {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .media__caption {
  margin-top: .85rem;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--muted);
  letter-spacing: .02em;
}

/* ---------- 沿革条目 ---------- */

.page-about .era-list {
  list-style: none;
  margin: clamp(2.5rem, 6vw, 4rem) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(2rem, 4.5vw, 3rem);
}

.page-about .era-item {
  display: grid;
  gap: .9rem;
  padding-left: 1.25rem;
  border-left: 1px solid var(--line);
  scroll-margin-top: 140px;
}

.page-about .era-item__mark {
  display: flex;
  align-items: baseline;
  gap: .75rem;
}

.page-about .era-item__year {
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
}

.page-about .era-item__kicker {
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .era-item__title {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 2.2vw, 1.4rem);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .era-item__body p {
  margin: 0;
  max-width: var(--measure);
  font-size: .9375rem;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 团队 ---------- */

.page-about .team-banner {
  margin: clamp(2rem, 5vw, 3rem) 0 0;
}

.page-about .ratio-list {
  list-style: none;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  gap: .5rem;
}

.page-about .ratio {
  display: grid;
  grid-template-columns: minmax(5.5rem, auto) minmax(0, 1fr) 3rem;
  align-items: center;
  gap: .75rem;
  padding: .85rem 0;
  border-bottom: var(--about-rule);
}

.page-about .ratio__name {
  font-size: .875rem;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .ratio__track {
  position: relative;
  display: block;
  height: 10px;
  border: 1px solid var(--line);
  border-radius: 1px;
  background: rgba(34, 68, 58, .28);
  overflow: hidden;
}

.page-about .ratio__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  background: linear-gradient(90deg, var(--mist) 0%, var(--cyan) 100%);
  transition: width var(--dur) var(--ease);
}

.page-about .ratio:hover .ratio__fill {
  background: linear-gradient(90deg, var(--cyan) 0%, var(--lime) 100%);
}

.page-about .ratio__num {
  text-align: right;
  font-size: 1rem;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .ratio--edit { --w: 38.2%; }
.page-about .ratio--data { --w: 26.5%; }
.page-about .ratio--prod { --w: 17.6%; }
.page-about .ratio--ops  { --w: 17.6%; }

/* ---------- 现场网络 ---------- */

.page-about .network {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .network__text p {
  margin: 0 0 1.1rem;
  max-width: var(--measure);
  font-size: .9375rem;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .network__tag {
  display: inline-block;
  margin: .25rem 0 0;
}

.page-about .node-map {
  width: 100%;
  height: auto;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding: .5rem 0;
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .node-map__link {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .node-map__node {
  fill: var(--muted);
  opacity: .55;
}

.page-about .node-map__node.is-active {
  fill: var(--cyan);
  opacity: 1;
}

/* ---------- 数据来源 ---------- */

.page-about .source-grid {
  display: grid;
  gap: clamp(2rem, 4vw, 3rem);
  margin-top: clamp(2rem, 5vw, 3rem);
}

.page-about .source-col {
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
}

.page-about .source-col__title {
  margin: 0 0 .9rem;
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--cyan);
}

.page-about .source-col p {
  margin: 0 0 1rem;
  font-size: .9375rem;
  line-height: 1.9;
  color: var(--muted);
}

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

/* ---------- 算法说明 ---------- */

.page-about .method-list {
  list-style: none;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: var(--about-rule);
}

.page-about .method-item {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: .5rem 1rem;
  padding: clamp(1.5rem, 3vw, 2rem) 0;
  border-bottom: var(--about-rule);
}

.page-about .method-item__idx {
  font-size: 1.5rem;
  line-height: 1;
  color: var(--line);
  letter-spacing: -.02em;
}

.page-about .method-item__name {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .method-item__body p {
  margin: 0;
  max-width: 58ch;
  font-size: .9375rem;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 纸白收束区块 ---------- */

.page-about .paper-grid {
  display: grid;
  gap: clamp(2rem, 4vw, 3.5rem);
}

.page-about .paper-grid__lead .section__title {
  margin: .6rem 0 1rem;
  color: var(--ink-900);
}

.page-about .paper-grid__lead p {
  margin: 0 0 1.75rem;
  max-width: 46ch;
  font-size: .9375rem;
  line-height: 1.9;
  color: var(--ink-700);
}

.page-about .contact-list {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid rgba(34, 68, 58, .35);
}

.page-about .contact-list__row {
  padding: 1.1rem 0;
  border-bottom: 1px solid rgba(34, 68, 58, .35);
}

.page-about .contact-list__term {
  font-size: .75rem;
  letter-spacing: .12em;
  color: #4A6259;
  margin-bottom: .4rem;
}

.page-about .contact-list__value {
  margin: 0;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink-900);
  word-break: break-word;
}

.page-about .contact-list__note {
  margin: .5rem 0 0;
  font-size: .8125rem;
  line-height: 1.75;
  color: #566E64;
}

.page-about .paper-grid__lead .btn {
  border-bottom: 1px solid transparent;
}

/* ---------- 响应式 ---------- */

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

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

  .page-about .network {
    grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
    align-items: start;
  }
}

@media (min-width: 880px) {
  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .era-item {
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 0 2.5rem;
    align-items: start;
    padding-left: 1.75rem;
  }

  .page-about .era-item__mark {
    flex-direction: column;
    gap: .5rem;
  }

  .page-about .method-item {
    grid-template-columns: 5rem minmax(0, 1fr);
    gap: 0 2rem;
  }

  .page-about .paper-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .9fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .network {
    grid-template-columns: minmax(0, 1fr) minmax(0, .7fr);
    gap: 4rem;
  }

  .page-about .ratio-list {
    gap: .25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}
<<<END>>>