.page-about {
  --ab-line: rgba(37, 230, 216, .3);
  --ab-hair: rgba(232, 241, 245, .1);
  --ab-body-text: #c9d9e2;
  background: var(--ink-900);
  color: var(--mist);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 2.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(62% 58% at 84% 6%, rgba(255, 61, 139, .2), transparent 72%),
    radial-gradient(56% 52% at 4% 0%, rgba(37, 230, 216, .16), transparent 74%),
    linear-gradient(180deg, var(--ink-900) 0%, #06101a 100%);
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--steel);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: .45rem;
  color: rgba(143, 166, 178, .6);
}

.page-about .breadcrumb a {
  color: var(--link);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  text-decoration: underline;
}

.page-about .ab-hero .eyebrow {
  margin: 1.6rem 0 .9rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .ab-hero__title {
  margin: 0 0 1.35rem;
  max-width: 20em;
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 8vw, 5.2rem);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -.025em;
  text-wrap: balance;
}

.page-about .ab-hero__title .ab-num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--gold);
  letter-spacing: .02em;
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .ab-hero__lead {
  max-width: 44rem;
  margin: 0;
  font-size: clamp(1rem, 2.2vw, 1.1875rem);
  line-height: 1.85;
  color: var(--ab-body-text);
}

.page-about .ab-facts {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-facts li {
  display: flex;
  align-items: baseline;
  gap: .5rem;
  padding: .5rem .9rem;
  border: 1px solid var(--ab-hair);
  border-radius: 999px;
  background: rgba(27, 58, 75, .45);
  font-size: .8125rem;
  color: var(--steel);
}

.page-about .ab-facts__num {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .ab-hero__arc {
  position: absolute;
  top: -16vw;
  right: -16vw;
  width: 56vw;
  height: 56vw;
  max-width: 540px;
  max-height: 540px;
  border: 1px solid rgba(255, 201, 107, .22);
  border-radius: 50%;
  box-shadow: inset 0 0 0 34px rgba(37, 230, 216, .05);
  pointer-events: none;
}

/* 章节骨架 */
.page-about .ab-sec {
  padding: clamp(2.5rem, 6.5vw, 5rem) 0;
  border-bottom: 1px solid rgba(232, 241, 245, .07);
}

.page-about .ab-sec--last {
  border-bottom: 0;
}

.page-about .ab-row {
  display: grid;
  gap: 1.15rem;
}

.page-about .ab-aside {
  display: flex;
  align-items: center;
  gap: .8rem;
}

.page-about .ab-aside__num {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  line-height: 1;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .ab-aside__label {
  font-size: .75rem;
  letter-spacing: .24em;
  color: var(--steel);
}

.page-about .ab-body {
  min-width: 0;
}

.page-about .ab-h2 {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-about .ab-h2::after {
  content: "";
  display: block;
  width: 48px;
  height: 2px;
  margin-top: .9rem;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
}

.page-about .ab-p {
  max-width: 44rem;
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ab-body-text);
}

.page-about .ab-p--after {
  margin-top: 1.5rem;
}

/* 七个坐标区 */
.page-about .ab-zones {
  display: grid;
  grid-template-columns: 1fr;
  gap: .8rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-zone {
  padding: 1rem 1.1rem 1.15rem;
  border: 1px solid var(--ab-hair);
  border-left: 2px solid rgba(37, 230, 216, .55);
  border-radius: var(--radius-sm);
  background: linear-gradient(140deg, rgba(27, 58, 75, .6), rgba(13, 34, 51, .92));
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}

.page-about .ab-zone:hover,
.page-about .ab-zone:focus-within {
  transform: translateY(-3px);
  border-color: var(--ab-line);
}

.page-about .ab-zone--lead {
  border-left-color: var(--magenta);
  background: linear-gradient(140deg, rgba(255, 61, 139, .14), rgba(13, 34, 51, .92));
}

.page-about .ab-zone__num {
  display: block;
  margin-bottom: .35rem;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .12em;
  color: var(--gold);
}

.page-about .ab-zone__name {
  margin: 0 0 .4rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .ab-zone__desc {
  margin: 0;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--steel);
}

/* 时间轴 */
.page-about .ab-route {
  display: block;
  width: 100%;
  height: auto;
  margin: 1.25rem 0 .5rem;
}

.page-about .ab-time {
  position: relative;
  margin: 1rem 0 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
}

.page-about .ab-time::before {
  content: "";
  position: absolute;
  top: .5rem;
  bottom: 1rem;
  left: .3rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--magenta) 60%, var(--gold));
  opacity: .55;
}

.page-about .ab-time__item {
  position: relative;
  padding-bottom: 1.6rem;
}

.page-about .ab-time__item::before {
  content: "";
  position: absolute;
  top: .45rem;
  left: -1.3rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(37, 230, 216, .12);
}

.page-about .ab-time__item:last-child {
  padding-bottom: .25rem;
}

.page-about .ab-time__year {
  display: block;
  margin-bottom: .3rem;
  font-family: var(--font-mono);
  font-size: .9375rem;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .ab-time__body h3 {
  margin: 0 0 .45rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .ab-time__body p {
  margin: 0;
  max-width: 40rem;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ab-body-text);
}

.page-about .ab-note {
  margin-top: 1.5rem;
  padding: 1.1rem 1.2rem 1.15rem;
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--paper-ink);
}

.page-about .ab-note__tag {
  display: block;
  margin-bottom: .35rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .16em;
  color: #8a5a1e;
}

.page-about .ab-note p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
}

/* 图片 */
.page-about .ab-figure {
  margin: 1.75rem 0 0;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .ab-figure--3-2 img {
  aspect-ratio: 3 / 2;
}

.page-about .ab-figure--10-7 img {
  aspect-ratio: 10 / 7;
}

.page-about .ab-figure figcaption {
  padding: .7rem .95rem .8rem;
  font-size: .8125rem;
  line-height: 1.65;
  color: var(--steel);
}

/* 团队 */
.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: .8rem;
  margin-top: 1.5rem;
}

.page-about .ab-team__card {
  padding: 1.1rem 1.15rem 1.2rem;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-sm);
  background: rgba(13, 34, 51, .85);
}

.page-about .ab-team__card h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--cyan);
}

.page-about .ab-team__card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--ab-body-text);
}

/* 合作网络 */
.page-about .ab-net {
  display: grid;
  grid-template-columns: 1fr;
  gap: .8rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-net__node {
  position: relative;
  padding: .95rem 1rem 1rem 2.1rem;
  border: 1px solid var(--ab-line);
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(27, 58, 75, .7), rgba(13, 34, 51, .95));
  outline: none;
}

.page-about .ab-net__node::before {
  content: "";
  position: absolute;
  top: 1.25rem;
  left: .95rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(37, 230, 216, .14);
}

.page-about .ab-net__node:focus-visible {
  box-shadow: 0 0 0 2px var(--link), 0 0 0 5px rgba(90, 169, 255, .25);
}

.page-about .ab-net__name {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .ab-net__count {
  margin-left: .55rem;
  font-family: var(--font-mono);
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--gold);
}

.page-about .ab-net__tip {
  display: block;
  margin-top: .45rem;
  font-size: .875rem;
  line-height: 1.72;
  color: var(--steel);
}

/* 下一步与联系 */
.page-about .ab-next {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-contact {
  margin-top: 2rem;
  padding: 1.2rem 1.25rem 1.3rem;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius);
  background: rgba(13, 34, 51, .8);
}

.page-about .ab-contact__line {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem .8rem;
  margin: 0 0 .65rem;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-contact__label {
  min-width: 4.6rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--steel);
}

.page-about .ab-contact__note {
  margin: .9rem 0 0;
  padding-top: .9rem;
  border-top: 1px dashed rgba(232, 241, 245, .16);
  font-size: .875rem;
  line-height: 1.75;
  color: var(--steel);
}

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

@media (min-width: 880px) {
  .page-about .ab-row {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: clamp(1.75rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .ab-aside {
    position: sticky;
    top: calc(var(--header-h) + 2.25rem);
    flex-direction: column;
    align-items: flex-start;
    gap: .55rem;
    padding-left: .2rem;
  }

  .page-about .ab-aside__num {
    font-size: 2.35rem;
  }

  .page-about .ab-p,
  .page-about .ab-p--after {
    font-size: 1.0625rem;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-zones {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-zone--lead {
    grid-column: span 2;
  }

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

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

  .page-about .ab-net__tip {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height .4s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
  }

  .page-about .ab-net__node:hover .ab-net__tip,
  .page-about .ab-net__node:focus .ab-net__tip,
  .page-about .ab-net__node:focus-within .ab-net__tip {
    max-height: 8rem;
    margin-top: .45rem;
    opacity: 1;
  }
}

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