.page-about {
  --ab-hair: rgba(157, 182, 200, 0.16);
  --ab-hair-strong: rgba(157, 182, 200, 0.3);
  --ab-grid: rgba(157, 182, 200, 0.055);
  --ab-glow: rgba(45, 226, 208, 0.12);
  position: relative;
  overflow-x: clip;
  color: var(--mist);
  font-family: var(--font-body);
  line-height: 1.85;
  background-image:
    repeating-linear-gradient(90deg, var(--ab-grid) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, var(--ab-grid) 0 1px, transparent 1px 96px);
  background-position: center top;
}

.page-about a {
  color: inherit;
  text-decoration: none;
}

.page-about .ab-link {
  color: var(--cyan);
  border-bottom: 1px solid rgba(45, 226, 208, 0.4);
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--lava);
  border-bottom-color: var(--lava);
}

.page-about :focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* 面包屑 */
.page-about .ab-crumb {
  padding-top: clamp(88px, 12vh, 132px);
  padding-bottom: 8px;
}

.page-about .ab-crumb .sig-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--tide);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-crumb .sig-breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--graphite);
}

.page-about .ab-crumb a {
  transition: color var(--t) var(--ease);
}

.page-about .ab-crumb a:hover {
  color: var(--cyan);
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  padding-bottom: clamp(32px, 5vw, 56px);
  isolation: isolate;
}

.page-about .ab-hero__bg {
  position: absolute;
  inset: 0 0 auto 0;
  height: min(72vh, 560px);
  overflow: hidden;
  z-index: 0;
  opacity: 0.5;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.55) 55%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.55) 55%, transparent 100%);
}

.page-about .ab-hero__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  max-width: 100%;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  padding-top: clamp(16px, 3vw, 36px);
}

.page-about .ab-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 7.4vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.045em;
  color: var(--mist);
}

.page-about .ab-hero__lead {
  margin: clamp(20px, 3vw, 32px) 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.5vw, 17px);
  color: rgba(242, 251, 255, 0.8);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-about .ab-hero__actions .sig-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  font-size: 14px;
  letter-spacing: 0.01em;
}

/* 数字带 */
.page-about .ab-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: clamp(36px, 5vw, 60px) auto 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-hair-strong);
}

.page-about .ab-stats__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 12px 18px 0;
  border-bottom: 1px solid var(--ab-hair);
}

.page-about .ab-stats__num {
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .ab-stats__unit {
  font-size: 0.46em;
  margin-left: 2px;
  color: var(--tide);
}

.page-about .ab-stats__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--tide);
}

/* 长卷主体 */
.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  padding-block: clamp(48px, 8vw, 112px);
}

/* 目录 */
.page-about .ab-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--tide);
}

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

.page-about .ab-toc__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--tide);
  border: 1px solid var(--ab-hair);
  border-radius: var(--r-pill);
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .ab-toc__num {
  font-size: 10px;
  color: var(--graphite);
  transition: color var(--t) var(--ease);
}

.page-about .ab-toc__list a:hover,
.page-about .ab-toc__list a:focus-visible {
  color: var(--mist);
  border-color: var(--cyan);
  background-color: rgba(45, 226, 208, 0.08);
}

.page-about .ab-toc__list a:hover .ab-toc__num {
  color: var(--cyan);
}

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

.page-about .ab-chapter + .ab-chapter {
  margin-top: clamp(56px, 8vw, 108px);
  padding-top: clamp(36px, 5vw, 64px);
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-chapter__head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .ab-chapter__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.6vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.035em;
  color: var(--mist);
}

.page-about .ab-chapter__body {
  max-width: 70ch;
}

.page-about .ab-chapter__body p {
  margin: 0 0 18px;
  font-size: clamp(15px, 1.5vw, 16.5px);
  color: rgba(242, 251, 255, 0.78);
}

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

.page-about .ab-chapter__body--tight {
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .ab-chapter__aside {
  margin-top: 22px;
  padding: 14px 0 14px 18px;
  border-left: 2px solid var(--violet);
  font-size: 14px;
  color: var(--tide) !important;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  line-height: 1.7;
}

/* 运动项目标签 */
.page-about .ab-sports {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-sports .sig-tag {
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border: 1px solid var(--ab-hair-strong);
  border-radius: var(--r-sm);
  transition: border-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-about .ab-sports .sig-tag:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* 图文分栏 */
.page-about .ab-chapter__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

/* 图片 */
.page-about .ab-figure {
  margin: clamp(24px, 4vw, 40px) 0 0;
  border: 1px solid var(--ab-hair);
  background-color: var(--night);
  overflow: hidden;
}

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

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  transition: filter var(--t) var(--ease);
}

.page-about .ab-figure:hover img {
  filter: brightness(1.08);
}

.page-about .ab-figure figcaption {
  padding: 11px 14px;
  border-top: 1px solid var(--ab-hair);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--tide);
}

/* 团队表 */
.page-about .ab-team {
  margin: clamp(24px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-hair-strong);
}

.page-about .ab-team__row {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 2px 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ab-hair);
  transition: border-color var(--t) var(--ease);
}

.page-about .ab-team__row:hover {
  border-bottom-color: var(--cyan);
}

.page-about .ab-team__no {
  grid-row: 1 / span 2;
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.08em;
  padding-top: 4px;
}

.page-about .ab-team__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .ab-team__desc {
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 251, 255, 0.7);
}

/* 时间轴 */
.page-about .ab-tl {
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0 0 0 clamp(16px, 3vw, 28px);
  list-style: none;
  border-left: 1px solid var(--ab-hair-strong);
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 40px) 0;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(16px, 3vw, 28px) - 4px);
  top: 12px;
  width: 7px;
  height: 7px;
  background-color: var(--abyss);
  border: 1px solid var(--cyan);
  transition: background-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
}

.page-about .ab-tl__item:hover::before {
  background-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(45, 226, 208, 0.16);
}

.page-about .ab-tl__year {
  display: block;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--graphite);
  transition: color var(--t) var(--ease);
}

.page-about .ab-tl__item:hover .ab-tl__year {
  color: var(--cyan);
}

.page-about .ab-tl__title {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .ab-tl__text {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 251, 255, 0.7);
}

/* 合作网络图 */
.page-about .ab-net {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(24px, 3vw, 36px);
}

.page-about .ab-net__map {
  position: relative;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--ab-hair);
  background-color: var(--night);
  background-image: radial-gradient(circle at 50% 50%, var(--ab-glow), transparent 68%);
}

.page-about .ab-net__lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.page-about .ab-net__lines line,
.page-about .ab-net__lines circle {
  stroke: rgba(45, 226, 208, 0.34);
  stroke-width: 0.8;
  fill: none;
  vector-effect: non-scaling-stroke;
}

.page-about .ab-net__lines circle {
  stroke: rgba(157, 182, 200, 0.18);
  stroke-dasharray: 3 5;
}

.page-about .ab-net__node {
  position: absolute;
  transform: translate(-50%, -50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 52px;
  min-height: 52px;
  padding: 8px 10px;
  border: 1px solid var(--ab-hair-strong);
  background-color: var(--abyss);
  border-radius: var(--r-sm);
  cursor: default;
  transition: border-color var(--t) var(--ease), background-color var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .ab-net__node b {
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
}

.page-about .ab-net__node:hover,
.page-about .ab-net__node:focus-visible {
  border-color: var(--cyan);
  background-color: var(--graphite);
}

.page-about .ab-net__node--hub {
  left: 50%;
  top: 50%;
  min-width: 92px;
  min-height: 62px;
  border-color: var(--cyan);
  background-color: rgba(45, 226, 208, 0.1);
}

.page-about .ab-net__node--a { left: 22%; top: 26%; }
.page-about .ab-net__node--b { left: 78%; top: 26%; }
.page-about .ab-net__node--c { left: 50%; top: 83%; }

.page-about .ab-net__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%);
  white-space: nowrap;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--mist);
  background-color: var(--graphite);
  border: 1px solid var(--cyan);
  border-radius: var(--r-sm);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t) var(--ease), visibility var(--t) var(--ease);
}

.page-about .ab-net__node:hover .ab-net__tip,
.page-about .ab-net__node:focus-visible .ab-net__tip {
  opacity: 1;
  visibility: visible;
}

.page-about .ab-net__legend {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .ab-net__legend li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ab-hair);
  font-size: 14px;
  color: rgba(242, 251, 255, 0.7);
  line-height: 1.7;
}

.page-about .ab-net__legend .sig-tag {
  font-size: 10.5px;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  border: 1px solid var(--ab-hair-strong);
  border-radius: var(--r-sm);
}

/* 访问形态 */
.page-about .ab-forms {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: clamp(24px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-hair-strong);
}

.page-about .ab-forms__item {
  padding: 18px 0;
  border-bottom: 1px solid var(--ab-hair);
  transition: border-color var(--t) var(--ease);
}

.page-about .ab-forms__item:hover {
  border-bottom-color: var(--cyan);
}

.page-about .ab-forms__type {
  display: block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--violet);
  margin-bottom: 6px;
}

.page-about .ab-forms__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 251, 255, 0.72);
}

/* 接入流程 */
.page-about .ab-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  background-color: var(--ab-hair);
  border: 1px solid var(--ab-hair);
}

.page-about .ab-flow__item {
  display: grid;
  gap: 4px;
  padding: 18px 16px;
  background-color: var(--night);
  transition: background-color var(--t) var(--ease);
}

.page-about .ab-flow__item:hover {
  background-color: var(--graphite);
}

.page-about .ab-flow__no {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--lava);
}

.page-about .ab-flow__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .ab-flow__text {
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(242, 251, 255, 0.66);
}

/* 收尾 */
.page-about .ab-close {
  position: relative;
  margin-top: clamp(24px, 4vw, 48px);
  padding-block: clamp(48px, 8vw, 96px);
  border-top: 1px solid var(--ab-hair-strong);
  background-image: radial-gradient(ellipse at 20% 0%, rgba(255, 122, 61, 0.1), transparent 62%);
}

.page-about .ab-close__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: var(--mist);
}

.page-about .ab-close__text {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  color: rgba(242, 251, 255, 0.76);
}

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

.page-about .ab-close__actions .sig-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  font-size: 14px;
}

/* 断点 */
@media (min-width: 560px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-stats__item {
    padding-left: 16px;
    border-left: 1px solid var(--ab-hair);
  }

  .page-about .ab-stats__item:first-child {
    padding-left: 0;
    border-left: 0;
  }
}

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

  .page-about .ab-net {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .ab-forms {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 28px;
  }

  .page-about .ab-team__row {
    grid-template-columns: 3rem minmax(120px, 0.4fr) minmax(0, 1fr);
    gap: 0 20px;
    align-items: start;
  }

  .page-about .ab-team__no {
    grid-row: auto;
    padding-top: 2px;
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(40px, 6vw, 96px);
  }

  .page-about .ab-toc {
    position: sticky;
    top: 120px;
    align-self: start;
  }

  .page-about .ab-toc__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding-bottom: 0;
  }

  .page-about .ab-toc__list a {
    border: 0;
    border-left: 1px solid var(--ab-hair);
    border-radius: 0;
    padding: 9px 0 9px 14px;
    background-color: transparent;
  }

  .page-about .ab-toc__list a:hover,
  .page-about .ab-toc__list a:focus-visible {
    border-left-color: var(--cyan);
    background-color: transparent;
  }

  .page-about .ab-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero__bg {
    height: min(78vh, 640px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
<<<PAGE_CSS_END>>>