.page-about{
  --about-off: 24px;
  --about-soft: rgba(141,163,173,.18);
  background: var(--ink-900);
  color: var(--paper);
  padding-bottom: clamp(32px,6vw,72px);
  overflow-x: clip;
}

.page-about .fs-breadcrumb{
  padding-top: clamp(14px,2.4vw,26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  padding: clamp(20px,4vw,40px) 0 clamp(30px,5vw,64px);
}
.page-about .about-hero::after{
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(141,163,173,.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(141,163,173,.09) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(120% 95% at 15% 0%, #000 28%, transparent 74%);
  mask-image: radial-gradient(120% 95% at 15% 0%, #000 28%, transparent 74%);
  pointer-events: none;
}
.page-about .about-hero__inner{
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: clamp(26px,4vw,48px);
  align-items: end;
}
.page-about .about-hero__title{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.5rem,8.6vw,5.6rem);
  line-height: .98;
  letter-spacing: -.02em;
  margin: .16em 0 .34em;
  color: var(--paper);
}
.page-about .about-hero__title em{
  font-style: normal;
  color: var(--cyan);
}
.page-about .about-hero__lede{
  max-width: 46ch;
  color: rgba(246,241,230,.82);
}
.page-about .about-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px,2.6vw,28px);
}
.page-about .about-hero__side{
  display: flex;
  align-items: stretch;
  gap: 14px;
  min-width: 0;
}
.page-about .about-hero__media{
  flex: 1 1 auto;
  min-width: 0;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-panel);
  overflow: hidden;
}
.page-about .about-hero__media img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-vert{
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--steel);
  margin: 0;
  padding-top: 6px;
  white-space: nowrap;
}

/* ---------- 粘性目录 ---------- */
.page-about .about-index{
  position: sticky;
  top: 72px;
  z-index: 4;
  margin: clamp(6px,1.6vw,16px) 0 clamp(20px,3.4vw,40px);
  padding: 8px 0;
  background: linear-gradient(180deg, var(--ink-900) 62%, rgba(6,19,31,0));
}
.page-about .about-index__list{
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 4px 2px 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .about-index__list::-webkit-scrollbar{ display: none; }
.page-about .about-index__link{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 16px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  background: rgba(12,37,54,.5);
  color: var(--paper);
  font-size: 13px;
  text-decoration: none;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible{
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(20,63,82,.6);
  outline: none;
}
.page-about .about-index__link:focus-visible{
  box-shadow: 0 0 0 2px var(--cyan);
}
.page-about .about-index__num{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec{
  padding: clamp(26px,4.4vw,54px) 0;
  scroll-margin-top: 150px;
}
.page-about .about-sechead{
  max-width: 780px;
  margin-bottom: clamp(20px,3.4vw,38px);
}
.page-about .about-sechead__num{
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--orange);
  margin-bottom: 10px;
}
.page-about .about-sechead .fs-h2{
  color: var(--paper);
  margin: 0 0 .5em;
}
.page-about .about-sechead__lede{
  color: rgba(246,241,230,.76);
  max-width: 58ch;
}

/* ---------- 01 起点画板 ---------- */
.page-about .about-board{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: clamp(16px,2.6vw,26px);
}
.page-about .about-board__paper{
  border: 1px solid rgba(36,26,20,.1);
}
.page-about .about-board__paper .fs-h2{
  color: var(--brown);
  margin: 0 0 .55em;
}
.page-about .about-board__paper .fs-lead + .fs-lead{
  margin-top: .9em;
}
.page-about .about-board__side{
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid var(--line-cyan);
}
.page-about .about-quote{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.25rem,2.6vw,1.75rem);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--orange);
}
.page-about .about-rulelist{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-rulelist li{
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.65;
  color: rgba(246,241,230,.78);
}
.page-about .about-rulelist li::before{
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--cyan);
}

/* ---------- 02 三类栏目 ---------- */
.page-about .about-pillars{
  display: grid;
  gap: clamp(12px,2vw,18px);
}
.page-about .about-pillar{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 12px;
  padding: clamp(18px,2.8vw,28px);
  background: var(--ink-800);
  border: 1px solid var(--about-soft);
  border-radius: var(--radius-panel);
  transition: border-color var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), background var(--t-mid) var(--ease);
}
.page-about .about-pillar:hover{
  border-color: var(--line-cyan);
  background: var(--ink-700);
  transform: translateY(-3px);
}
.page-about .about-pillar__label{
  justify-self: start;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}
.page-about .about-pillar__body .fs-h3{
  color: var(--paper);
  margin: 0 0 .5em;
}
.page-about .about-pillar__body p{
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(246,241,230,.78);
}
.page-about .about-pillar__body .fs-note{
  margin-top: 10px;
  color: var(--steel);
}
.page-about .about-pillar__link{
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,106,42,.4);
  padding-bottom: 2px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.page-about .about-pillar__link:hover,
.page-about .about-pillar__link:focus-visible{
  color: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

/* ---------- 03 版本时间轴 ---------- */
.page-about .about-tl{
  position: relative;
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: clamp(18px,3vw,26px);
  padding-top: 8px;
}
.page-about .about-tl__rail{ display: none; }
.page-about .about-tl__item{
  position: relative;
  padding: clamp(16px,2.6vw,24px);
  border: 1px solid var(--about-soft);
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius-panel) var(--radius-panel) 0;
  background: linear-gradient(120deg, rgba(12,37,54,.85), rgba(6,19,31,.55));
}
.page-about .about-tl__item--v2{ border-left-color: var(--cyan); }
.page-about .about-tl__item--v3{ border-left-color: var(--green); }
.page-about .about-tl__ver{
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .2em;
  color: var(--orange);
  margin: 0 0 8px;
}
.page-about .about-tl__item--v2 .about-tl__ver{ color: var(--cyan); }
.page-about .about-tl__item--v3 .about-tl__ver{ color: var(--green); }
.page-about .about-tl__item .fs-h3{
  color: var(--paper);
  margin: 0 0 .5em;
}
.page-about .about-tl__item p{
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(246,241,230,.78);
}
.page-about .about-tl__figure{
  margin: clamp(22px,3.4vw,34px) 0 0;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-panel);
  overflow: hidden;
}
.page-about .about-tl__figure img,
.page-about .about-team__figure img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 04 团队 ---------- */
.page-about .about-board--team{
  gap: clamp(16px,2.8vw,28px);
}
.page-about .about-team__figure{
  margin: 0;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-panel);
  overflow: hidden;
}
.page-about .about-team__paper .fs-h2{
  color: var(--brown);
  margin: 0 0 .55em;
}
.page-about .about-roles{
  list-style: none;
  margin: clamp(14px,2.4vw,22px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-roles li{
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(36,26,20,.78);
  padding-left: 16px;
  border-left: 2px solid rgba(36,26,20,.14);
}
.page-about .about-roles strong{
  color: var(--brown);
  font-weight: 700;
  margin-right: 6px;
}
.page-about .about-team__data{
  margin-top: clamp(16px,2.6vw,24px);
  border-top: 1px solid rgba(36,26,20,.14);
  padding-top: 14px;
}
.page-about .about-team__data .fs-data__label{ color: rgba(36,26,20,.6); }
.page-about .about-team__data .fs-data__value{ color: var(--brown); }
.page-about .about-team__data .fs-data__value em{ color: var(--orange); }

/* ---------- 05 覆盖 ---------- */
.page-about .about-sports{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(22px,3.2vw,32px);
  padding: 0;
}
.page-about .about-sport{
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--about-soft);
  background: rgba(12,37,54,.6);
  font-size: 13.5px;
  color: rgba(246,241,230,.86);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.page-about .about-sport:hover{
  border-color: var(--cyan);
  color: var(--cyan);
}
.page-about .about-databand{
  padding: clamp(16px,2.6vw,24px);
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-panel);
  background: linear-gradient(100deg, rgba(20,63,82,.55), rgba(6,19,31,.2));
}
.page-about .about-databand .fs-data__value{ color: var(--paper); }
.page-about .about-databand .fs-data__value em{ color: var(--cyan); font-style: normal; }
.page-about .about-coverage__note{
  margin: clamp(18px,3vw,26px) 0 0;
  max-width: 62ch;
  color: rgba(246,241,230,.76);
}

/* ---------- 06 联系 ---------- */
.page-about .about-contact{
  border: 1px solid rgba(36,26,20,.1);
}
.page-about .about-contact .fs-h2{
  color: var(--brown);
  margin: 0 0 .5em;
}
.page-about .about-contact__grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: clamp(14px,2.4vw,22px);
  margin-top: clamp(18px,3vw,28px);
  padding-top: clamp(16px,2.6vw,22px);
  border-top: 1px solid rgba(36,26,20,.14);
}
.page-about .about-contact__label{
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: rgba(36,26,20,.55);
  margin: 0 0 6px;
}
.page-about .about-contact__value{
  font-family: var(--font-mono);
  font-size: clamp(14px,1.6vw,16px);
  line-height: 1.5;
  color: var(--brown);
  margin: 0;
  word-break: break-word;
}
.page-about .about-contact__value--sm{
  font-family: var(--font-display);
  font-size: 14.5px;
  line-height: 1.7;
  font-weight: 500;
}
.page-about .about-contact__hint{
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(36,26,20,.62);
}
.page-about .about-contact__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px,3vw,26px);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px){
  .page-about .about-pillar{
    grid-template-columns: 92px minmax(0,1fr) auto;
    align-items: start;
    gap: 20px;
  }
  .page-about .about-pillar--offset{
    margin-left: 32px;
  }
  .page-about .about-pillar__link{
    justify-self: end;
    align-self: center;
  }
  .page-about .about-contact__grid{
    grid-template-columns: repeat(2,minmax(0,1fr));
  }
}

@media (min-width: 900px){
  .page-about .about-hero__inner{
    grid-template-columns: minmax(0,7fr) minmax(0,5fr);
    gap: clamp(30px,4vw,56px);
  }
  .page-about .about-board--origin{
    grid-template-columns: minmax(0,7fr) minmax(0,5fr);
  }
  .page-about .about-board--origin .about-board__side{
    margin-top: 48px;
  }
  .page-about .about-board--team{
    grid-template-columns: minmax(0,5fr) minmax(0,7fr);
    align-items: start;
  }
  .page-about .about-board--team .about-team__figure{
    margin-top: 32px;
  }
  .page-about .about-tl{
    grid-template-columns: repeat(3,minmax(0,1fr));
    gap: clamp(18px,2.4vw,26px);
    padding-top: 52px;
  }
  .page-about .about-tl__rail{
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 20px;
    height: 2px;
    background: linear-gradient(90deg, var(--orange), rgba(53,240,208,.75) 55%, rgba(141,163,173,.22));
  }
  .page-about .about-tl__item{
    border-left-width: 1px;
    border-radius: var(--radius-panel);
  }
  .page-about .about-tl__item::before{
    content: "";
    position: absolute;
    top: -32px;
    left: 22px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--ink-900);
    border: 2px solid var(--orange);
    box-shadow: 0 0 0 4px rgba(255,106,42,.12);
  }
  .page-about .about-tl__item--v2::before{
    border-color: var(--cyan);
    box-shadow: 0 0 0 4px rgba(53,240,208,.14);
  }
  .page-about .about-tl__item--v3::before{
    border-color: var(--green);
    box-shadow: 0 0 0 4px rgba(123,224,163,.14);
  }
  .page-about .about-tl__item--v2{ transform: translateY(18px); }
  .page-about .about-tl__item--v3{ transform: translateY(36px); }
  .page-about .about-tl__figure{ margin-top: clamp(56px,6vw,76px); }
  .page-about .about-contact__grid{
    grid-template-columns: repeat(4,minmax(0,1fr));
  }
}

@media (min-width: 1100px){
  .page-about .about-index{ top: 84px; }
}

@media (max-width: 600px){
  .page-about .about-vert{ display: none; }
  .page-about .about-index{ top: 64px; }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-pillar:hover,
  .page-about .about-tl__item--v2,
  .page-about .about-tl__item--v3{
    transform: none;
  }
  .page-about .about-pillar,
  .page-about .about-index__link{
    transition: none;
  }
}
<<<PAGE_CSS_END>>>
```