.page-about{
  --rail-w: 96px;
  --about-pad: clamp(20px, 4.6vw, 60px);
  --about-lime-ink: #435F0E;
  background: var(--ink);
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: clamp(560px, 88vh, 860px);
  padding-top: calc(var(--header-h) + 8px);
  background: var(--ink);
  overflow: hidden;
}
.page-about .about-hero__bg{
  position: absolute;
  inset: 0;
  z-index: -3;
}
.page-about .about-hero__bg img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  opacity: .42;
  filter: grayscale(.2) saturate(.9);
}
.page-about .about-hero__veil{
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(90% 70% at 8% 12%, rgba(200,255,61,.14), transparent 62%),
    linear-gradient(180deg, rgba(11,31,26,.72) 0%, rgba(11,31,26,.55) 46%, var(--ink) 96%);
}
.page-about .about-hero__frame{
  position: absolute;
  inset: calc(var(--header-h) + 14px) clamp(10px, 2.4vw, 26px) 0;
  z-index: -1;
  border: 1px solid rgba(200,255,61,.16);
  border-bottom: 0;
  pointer-events: none;
}
.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after{
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--lime);
  opacity: .72;
}
.page-about .about-hero__frame::before{
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}
.page-about .about-hero__frame::after{
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}
.page-about .about-hero__inner{
  padding-block: clamp(30px, 5vw, 68px) clamp(30px, 4vw, 52px);
}
.page-about .about-hero .breadcrumb{
  margin-bottom: clamp(22px, 4vw, 44px);
}
.page-about .about-hero__grid{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 44px);
  align-items: end;
}
.page-about .about-hero__title{
  margin: 0;
  font-size: clamp(34px, 6.6vw, 84px);
  line-height: 1.02;
  letter-spacing: -.018em;
}
.page-about .about-hero__lede{
  border-left: 2px solid var(--lime);
  padding-left: clamp(14px, 1.6vw, 20px);
}
.page-about .about-hero__lede p{
  margin: 0;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .about-hero__cta{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}
.page-about .about-hero__bar{
  border-top: 1px solid rgba(242,247,243,.14);
  background: rgba(11,31,26,.7);
}
.page-about .about-hero__bar-inner{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(242,247,243,.12);
}
.page-about .about-stat{
  display: block;
  padding: 14px clamp(10px, 2vw, 20px);
  background: var(--ink);
}
.page-about .about-stat__v{
  display: block;
  font-family: var(--font-num);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--lime);
  line-height: 1.1;
}
.page-about .about-stat__k{
  display: block;
  margin-top: 4px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  background: var(--ink);
}
.page-about .about-stream{
  min-width: 0;
}
.page-about .about-rail{
  display: none;
}
.page-about .about-rail__list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 30px;
}
.page-about .about-rail__link{
  position: relative;
  display: block;
  padding-left: 18px;
  text-decoration: none;
  color: var(--muted);
  transition: color .22s var(--ease), transform .22s var(--ease);
}
.page-about .about-rail__link::before{
  content: "";
  position: absolute;
  left: 2px;
  top: 5px;
  width: 7px;
  height: 7px;
  background: currentColor;
  transform: rotate(45deg);
}
.page-about .about-rail__num{
  display: block;
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: .16em;
  opacity: .85;
}
.page-about .about-rail__name{
  display: block;
  margin-top: 2px;
  font-size: 12px;
  letter-spacing: .08em;
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible{
  color: var(--lime);
}
.page-about:has(#why:target) .about-rail__link[href="#why"],
.page-about:has(#timeline:target) .about-rail__link[href="#timeline"],
.page-about:has(#team:target) .about-rail__link[href="#team"],
.page-about:has(#sources:target) .about-rail__link[href="#sources"],
.page-about:has(#principles:target) .about-rail__link[href="#principles"],
.page-about:has(#cooperate:target) .about-rail__link[href="#cooperate"]{
  color: var(--lime);
}

/* ---------- 分区通用 ---------- */
.page-about .about-sec{
  position: relative;
  padding-block: clamp(52px, 7vw, 104px);
  padding-inline: max(var(--about-pad), calc((100% - 1160px) / 2));
  scroll-margin-top: calc(var(--header-h-stuck) + 14px);
}
.page-about .about-sec--ink{
  background: var(--ink);
}
.page-about .about-sec--ink2{
  background: var(--ink-2);
}
.page-about .about-sec--light{
  background: var(--white);
  color: var(--char);
}
.page-about .about-sec--light .label{
  color: var(--about-lime-ink);
}
.page-about .about-sec__head{
  max-width: 64ch;
  margin-bottom: clamp(26px, 4vw, 48px);
}
.page-about .about-sec__title{
  margin: 10px 0 0;
  font-size: clamp(25px, 3.5vw, 44px);
  line-height: 1.14;
  letter-spacing: -.012em;
  font-weight: 800;
}
.page-about .about-sec--light .about-sec__title{
  color: var(--char);
}
.page-about .about-sec__lede{
  margin: 16px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .about-sec--light .about-sec__lede{
  color: rgba(16,20,15,.72);
}

/* ---------- 01 起点 ---------- */
.page-about .about-cols{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
}
.page-about .about-prose p{
  margin: 0 0 1.05em;
  font-size: clamp(16px, 1.2vw, 17px);
  line-height: 1.85;
  color: var(--text-dim);
}
.page-about .about-prose p:last-child{
  margin-bottom: 0;
}
.page-about .about-note{
  position: relative;
  align-self: start;
  padding: 20px 22px 22px;
  background: rgba(30,74,62,.4);
  border: 1px solid var(--line);
  border-top: 2px solid var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.page-about .about-note__k{
  margin: 0;
}
.page-about .about-note__v{
  display: block;
  margin: 8px 0 8px;
  font-family: var(--font-num);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--lime);
}
.page-about .about-note__d{
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-mute);
}

/* ---------- 02 历程 ---------- */
.page-about .about-archive{
  margin: 0 0 clamp(26px, 4vw, 44px);
  position: relative;
  overflow: hidden;
}
.page-about .about-archive img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(.85);
}
.page-about .about-archive figcaption{
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 30px 18px 14px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--white);
  background: linear-gradient(180deg, transparent, rgba(11,31,26,.9));
}
.page-about .about-tl{
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding: 4px 2px 20px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.page-about .about-tl::-webkit-scrollbar{
  height: 4px;
}
.page-about .about-tl::-webkit-scrollbar-thumb{
  background: var(--line);
}
.page-about .about-tl__item{
  position: relative;
  flex: 0 0 auto;
  width: min(76vw, 282px);
  scroll-snap-align: start;
  padding: 20px 20px 18px;
  background: rgba(11,31,26,.72);
  border: 1px solid var(--line);
  border-top: 2px solid rgba(200,255,61,.5);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}
.page-about .about-tl__item > summary{
  display: block;
  list-style: none;
  cursor: pointer;
}
.page-about .about-tl__item > summary::-webkit-details-marker{
  display: none;
}
.page-about .about-tl__item > summary::after{
  content: "+";
  position: absolute;
  top: 14px;
  right: 18px;
  font-family: var(--font-num);
  font-size: 17px;
  line-height: 1;
  color: var(--lime);
}
.page-about .about-tl__item[open] > summary::after{
  content: "−";
}
.page-about .about-tl__node{
  display: block;
  width: 10px;
  height: 10px;
  margin-bottom: 14px;
  background: var(--lime);
  transform: rotate(45deg);
}
.page-about .about-tl__year{
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
}
.page-about .about-tl__name{
  display: block;
  margin-top: 5px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--white);
}
.page-about .about-tl__body{
  margin: 14px 0 0;
  padding-top: 13px;
  border-top: 1px solid rgba(242,247,243,.14);
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 44px);
}
.page-about .about-team__media{
  position: relative;
  margin: 0;
  overflow: hidden;
}
.page-about .about-team__media img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}
.page-about .about-team__media figcaption{
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 32px 16px 13px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--white);
  background: linear-gradient(180deg, transparent, rgba(11,31,26,.92));
}
.page-about .about-team__cards{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}
.page-about .about-role{
  padding: 18px 18px 20px;
  background: #FFFFFF;
  border: 1px solid rgba(16,20,15,.1);
  border-left: 3px solid var(--lime-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}
.page-about .about-role:hover{
  transform: translateY(-4px);
  box-shadow: 0 18px 32px -20px rgba(11,31,26,.55);
}
.page-about .about-role__order{
  display: block;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--lime-deep);
}
.page-about .about-role__name{
  margin: 8px 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--char);
}
.page-about .about-role__duty{
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(16,20,15,.74);
}
.page-about .about-role__duty a{
  color: var(--about-lime-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 700;
}

/* ---------- 04 来源 ---------- */
.page-about .about-src{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: rgba(242,247,243,.12);
  border-block: 1px solid rgba(242,247,243,.12);
}
.page-about .about-src__item{
  padding: 24px 20px 26px;
  background: var(--ink-2);
}
.page-about .about-src__num{
  display: block;
  font-family: var(--font-num);
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--orange);
}
.page-about .about-src__name{
  margin: 12px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-src__text{
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 05 原则 ---------- */
.page-about .about-rules{
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-rule{
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 8px;
  padding-block: clamp(20px, 3vw, 30px);
  border-top: 1px solid rgba(242,247,243,.14);
}
.page-about .about-rule:last-child{
  border-bottom: 1px solid rgba(242,247,243,.14);
}
.page-about .about-rule__idx{
  grid-row: span 2;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--lime);
  padding-top: 5px;
}
.page-about .about-rule__name{
  margin: 0;
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--white);
}
.page-about .about-rule__text{
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 06 协作 ---------- */
.page-about .about-join{
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4.4vw, 54px);
  background: var(--lime);
  color: var(--char);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 40px), calc(100% - 40px) 100%, 0 100%);
}
.page-about .about-join::after{
  content: "";
  position: absolute;
  right: -50px;
  bottom: -70px;
  width: 280px;
  height: 280px;
  background-image: radial-gradient(circle, rgba(11,31,26,.16) 0 1px, transparent 1px);
  background-size: 14px 14px;
  transform: rotate(-6deg);
  pointer-events: none;
}
.page-about .about-join .label{
  color: rgba(16,20,15,.66);
}
.page-about .about-join h2{
  position: relative;
  margin: 10px 0 14px;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -.012em;
  font-weight: 800;
  color: var(--char);
}
.page-about .about-join p{
  position: relative;
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(16,20,15,.8);
}
.page-about .about-join__actions{
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 22px;
  margin-top: 26px;
}
.page-about .about-join__cta{
  display: inline-flex;
  align-items: center;
  padding: 13px 24px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  background: var(--ink);
  color: var(--white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: background .2s var(--ease), color .2s var(--ease);
}
.page-about .about-join__cta:hover,
.page-about .about-join__cta:focus-visible{
  background: var(--orange);
  color: var(--char);
}
.page-about .about-join__link{
  display: inline-flex;
  align-items: center;
  padding: 6px 2px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  color: var(--char);
  border-bottom: 2px solid rgba(16,20,15,.35);
  transition: border-color .2s var(--ease);
}
.page-about .about-join__link:hover,
.page-about .about-join__link:focus-visible{
  border-color: var(--ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px){
  .page-about .about-team__cards{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-role:nth-child(2){
    margin-top: 26px;
  }
  .page-about .about-role:nth-child(4){
    margin-top: 26px;
  }
}

@media (min-width: 760px){
  .page-about .about-hero__bar-inner{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 820px){
  .page-about .about-hero__grid{
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    gap: clamp(32px, 5vw, 80px);
  }
  .page-about .about-cols{
    grid-template-columns: minmax(0, 1.7fr) minmax(0, .9fr);
    align-items: start;
  }
  .page-about .about-rule{
    grid-template-columns: 64px minmax(0, .85fr) minmax(0, 1.5fr);
    align-items: baseline;
    column-gap: 24px;
  }
  .page-about .about-rule__idx{
    grid-row: auto;
    padding-top: 0;
  }
}

@media (min-width: 900px){
  .page-about .about-team{
    grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr);
    align-items: start;
  }
  .page-about .about-team__media{
    order: 2;
  }
}

@media (min-width: 1024px){
  .page-about .about-body{
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
  }
  .page-about .about-rail{
    display: block;
    position: sticky;
    top: calc(var(--header-h-stuck) + 32px);
    align-self: start;
    padding: 40px 0 0 24px;
  }
  .page-about .about-rail::before{
    content: "";
    position: absolute;
    left: 13px;
    top: 50px;
    width: 1px;
    height: calc(100% - 66px);
    background: repeating-linear-gradient(180deg, rgba(126,143,134,.5) 0 1px, transparent 1px 8px);
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-role,
  .page-about .about-rail__link,
  .page-about .about-join__cta{
    transition: none;
  }
  .page-about .about-role:hover{
    transform: none;
  }
}
<<<END>>>