.page-about{
  --about-hair: rgba(27,90,71,.9);
  --about-soft: rgba(232,245,240,.08);
  overflow-x: clip;
  color: var(--mist-100);
  background:
    radial-gradient(90% 42% at 88% -6%, rgba(0,229,195,.13), transparent 62%),
    radial-gradient(70% 40% at 0% 22%, rgba(0,229,195,.06), transparent 60%),
    var(--ink-900);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero{
  padding: clamp(22px,4vw,52px) 0 clamp(28px,4vw,50px);
}
.page-about .about-hero__inner{
  display: grid;
  gap: clamp(18px,3vw,30px);
  align-items: end;
}
.page-about .about-hero__panel{
  position: relative;
  padding: clamp(22px,4vw,44px);
  border: 1px solid rgba(0,229,195,.34);
  border-radius: var(--radius-lg);
  background: linear-gradient(165deg, rgba(7,30,23,.94), rgba(18,74,57,.72));
  box-shadow: 0 24px 60px -40px rgba(0,0,0,.9);
}
.page-about .about-hero__panel::before,
.page-about .about-hero__panel::after{
  content: "";
  position: absolute;
  width: 24px;
  height: 24px;
  border: 2px solid var(--cyan);
  opacity: .85;
  pointer-events: none;
}
.page-about .about-hero__panel::before{
  top: -2px;
  left: -2px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: var(--radius-lg);
}
.page-about .about-hero__panel::after{
  bottom: -2px;
  right: -2px;
  border-left: 0;
  border-top: 0;
  border-bottom-right-radius: var(--radius-lg);
}
.page-about .about-crumb{
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist-400);
  margin-bottom: clamp(16px,3vw,26px);
}
.page-about .about-crumb__link{
  color: var(--mist-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-crumb__link:hover,
.page-about .about-crumb__link:focus-visible{
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-about .about-crumb__sep{ color: var(--ink-700); }
.page-about .about-crumb__now{ color: var(--mist-100); }

.page-about .about-hero__eyebrow{
  margin: 0 0 14px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.page-about .about-hero__title{
  margin: 0 0 clamp(16px,2.4vw,24px);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(32px, 6.2vw, 62px);
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--mist-100);
  text-wrap: balance;
}
.page-about .about-hero__lead{
  margin: 0 0 clamp(24px,3.4vw,36px);
  max-width: 46em;
  font-size: clamp(15px,1.5vw,17px);
  line-height: 1.78;
  color: var(--mist-400);
}
.page-about .about-hero__stats{
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 1px;
  margin: 0;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.page-about .about-hero__stat{
  padding: 16px 18px;
  background: rgba(7,30,23,.72);
}
.page-about .about-hero__key{
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist-400);
}
.page-about .about-hero__val{
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(20px,2.4vw,28px);
  line-height: 1.1;
  color: var(--cyan);
}
.page-about .about-hero__media{
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: var(--ink-950);
}
.page-about .about-hero__media img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

/* ---------- 长卷双栏 ---------- */
.page-about .about-layout{
  display: grid;
  gap: clamp(20px,3vw,34px);
  padding-bottom: clamp(56px,8vw,104px);
}

.page-about .about-rail{
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  background: var(--ink-800);
  padding: 14px;
}
.page-about .about-rail__label{
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist-400);
}
.page-about .about-rail__list{
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-rail__item{ flex: 0 0 auto; }
.page-about .about-rail__link{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--ink-700);
  color: var(--mist-100);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .2s var(--ease), background .2s var(--ease), color .2s var(--ease);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible{
  border-color: var(--cyan);
  background: var(--cyan-soft);
  color: var(--cyan);
}
.page-about .about-rail__idx{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: .06em;
}

.page-about .about-main{
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(44px,7vw,88px);
}

/* ---------- 章节头 ---------- */
.page-about .about-chapter{
  scroll-margin-top: calc(var(--header-h) + 24px);
}
.page-about .chapter-head{
  position: relative;
  padding-left: 16px;
  margin-bottom: clamp(16px,2.6vw,26px);
  border-left: 3px solid var(--cyan);
}
.page-about .chapter-head__num{
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--mist-400);
}
.page-about .chapter-head__title{
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(24px,3.6vw,38px);
  line-height: 1.15;
  letter-spacing: -.005em;
  color: var(--mist-100);
}
.page-about .about-chapter__body p,
.page-about .about-chapter__intro,
.page-about .about-chapter__note{
  margin: 0 0 16px;
  max-width: 40em;
  font-size: clamp(15px,1.4vw,16.5px);
  line-height: 1.8;
  color: var(--mist-400);
}
.page-about .about-chapter__body p:last-child{ margin-bottom: 0; }
.page-about .about-chapter__note{
  margin-top: clamp(16px,2.4vw,24px);
  padding: 16px 20px;
  border-left: 2px solid var(--amber);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(255,183,3,.07);
  color: var(--mist-100);
  max-width: none;
}
.page-about .about-chapter__more{ margin-top: 20px; }
.page-about .about-link{
  display: inline-block;
  color: var(--cyan);
  text-decoration: none;
  font-size: 14.5px;
  border-bottom: 1px solid rgba(0,229,195,.4);
  padding-bottom: 2px;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible{
  border-bottom-color: var(--cyan);
}

/* ---------- 时间线 ---------- */
.page-about .tl{
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .tl::before{
  content: "";
  position: absolute;
  left: 15px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(27,90,71,.35));
}
.page-about .tl__item{
  position: relative;
  padding-left: 52px;
  margin-bottom: 14px;
}
.page-about .tl__item:last-child{ margin-bottom: 0; }
.page-about .tl__node{
  position: absolute;
  left: 0;
  top: 12px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--ink-700);
  background: var(--ink-950);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  z-index: 1;
}
.page-about .tl__details{
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  background: var(--ink-800);
  transition: border-color .24s var(--ease), background .24s var(--ease);
}
.page-about .tl__details[open]{
  border-color: rgba(0,229,195,.45);
  background: rgba(18,74,57,.95);
}
.page-about .tl__summary{
  display: grid;
  grid-template-columns: auto minmax(0,1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}
.page-about .tl__summary::-webkit-details-marker{ display: none; }
.page-about .tl__summary:focus-visible{
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  border-radius: var(--radius-md);
}
.page-about .tl__year{
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--cyan);
  letter-spacing: .04em;
}
.page-about .tl__title{
  margin: 0;
  font-size: clamp(15px,1.5vw,17px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--mist-100);
}
.page-about .tl__plus{
  position: relative;
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  transition: transform .24s var(--ease);
}
.page-about .tl__plus::before,
.page-about .tl__plus::after{
  content: "";
  position: absolute;
  inset: 50% 0 auto 0;
  height: 2px;
  background: var(--mist-400);
  border-radius: 2px;
  transform: translateY(-50%);
}
.page-about .tl__plus::after{
  transform: translateY(-50%) rotate(90deg);
  transition: opacity .24s var(--ease);
}
.page-about .tl__details[open] .tl__plus::after{ opacity: 0; }
.page-about .tl__details[open] .tl__plus::before{ background: var(--cyan); }
.page-about .tl__body{
  padding: 0 18px 18px;
  border-top: 1px solid var(--ink-700);
  margin-top: 2px;
  padding-top: 14px;
}
.page-about .tl__body p{
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist-400);
}

/* ---------- 团队 ---------- */
.page-about .about-crew{
  display: grid;
  gap: clamp(16px,2.6vw,28px);
}
.page-about .about-crew__text p{
  margin: 0 0 16px;
  font-size: clamp(15px,1.4vw,16.5px);
  line-height: 1.8;
  color: var(--mist-400);
}
.page-about .about-crew__text p:last-child{ margin-bottom: 0; }
.page-about .about-crew__media{
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: var(--ink-950);
}
.page-about .about-crew__media img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 14 / 9;
}
.page-about .media__caption{
  display: block;
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist-400);
  background: var(--ink-950);
  border-top: 1px solid var(--about-hair);
}
.page-about .crew-bars{
  list-style: none;
  margin: clamp(18px,2.6vw,26px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .crew-bars__head{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}
.page-about .crew-bars__name{
  font-size: 14px;
  color: var(--mist-100);
  letter-spacing: .02em;
}
.page-about .crew-bars__val{
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 18px;
  color: var(--cyan);
}
.page-about .crew-bars__track{
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--about-soft);
  overflow: hidden;
}
.page-about .crew-bars__fill{
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
}
.page-about .crew-bars__fill--edit{ width: 42.9%; background: var(--cyan); }
.page-about .crew-bars__fill--product{ width: 28.6%; background: var(--amber); }
.page-about .crew-bars__fill--tech{ width: 28.6%; background: var(--mist-400); }

/* ---------- 联赛覆盖 ---------- */
.page-about .about-leagues{
  display: grid;
  gap: clamp(16px,2.6vw,28px);
}
.page-about .about-leagues__text p{
  margin: 0 0 18px;
  font-size: clamp(15px,1.4vw,16.5px);
  line-height: 1.8;
  color: var(--mist-400);
}
.page-about .about-leagues__media{
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: var(--ink-950);
}
.page-about .about-leagues__media img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 6 / 5;
}
.page-about .tree{
  display: grid;
  gap: 10px;
}
.page-about .tree__group{
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-sm);
  background: rgba(7,30,23,.55);
}
.page-about .tree__summary{
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 14.5px;
  color: var(--mist-100);
}
.page-about .tree__summary::-webkit-details-marker{ display: none; }
.page-about .tree__summary:focus-visible{
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  border-radius: var(--radius-sm);
}
.page-about .tree__tag{
  flex: 0 0 auto;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(0,229,195,.5);
  background: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cyan);
}
.page-about .tree__group[open] .tree__summary{
  border-bottom: 1px solid var(--ink-700);
}
.page-about .tree__body{
  padding: 14px 16px 16px;
}
.page-about .tree__body p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist-400);
}

/* ---------- 服务承诺 ---------- */
.page-about .promise-grid{
  display: grid;
  gap: 14px;
}
.page-about .promise-card{
  padding: clamp(18px,2.4vw,24px);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  background: linear-gradient(170deg, rgba(18,74,57,.85), rgba(7,30,23,.7));
}
.page-about .promise-card__title{
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--cyan);
}
.page-about .promise-card__text{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist-400);
}

.page-about .about-facts{
  margin-top: clamp(22px,3.2vw,32px);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-950);
}
.page-about .about-facts__row{
  display: grid;
  gap: 4px;
  padding: 13px 18px;
  border-bottom: 1px solid rgba(27,90,71,.55);
}
.page-about .about-facts__row:last-child{ border-bottom: 0; }
.page-about .about-facts__key{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist-400);
}
.page-about .about-facts__val{
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--mist-100);
  word-break: break-word;
}

.page-about .about-cta{
  margin-top: clamp(22px,3.2vw,34px);
  display: grid;
  gap: 16px;
  padding: clamp(20px,3vw,30px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0,229,195,.3);
  background:
    radial-gradient(80% 120% at 100% 0%, rgba(0,229,195,.14), transparent 60%),
    var(--ink-800);
}
.page-about .about-cta__text{
  margin: 0;
  font-size: clamp(15px,1.5vw,17px);
  line-height: 1.75;
  color: var(--mist-100);
}
.page-about .about-cta__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px){
  .page-about .about-hero__stats{ grid-template-columns: repeat(4, minmax(0,1fr)); }
  .page-about .promise-grid{ grid-template-columns: repeat(2, minmax(0,1fr)); }
  .page-about .about-facts__row{
    grid-template-columns: 128px minmax(0,1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 900px){
  .page-about .about-hero__inner{
    grid-template-columns: minmax(0,1.15fr) minmax(0,.85fr);
    gap: clamp(24px,3vw,40px);
  }
  .page-about .about-crew{
    grid-template-columns: minmax(0,1fr) minmax(0,.82fr);
    align-items: start;
  }
  .page-about .about-leagues{
    grid-template-columns: minmax(0,1.05fr) minmax(0,.95fr);
    align-items: start;
  }
  .page-about .promise-grid{ grid-template-columns: repeat(3, minmax(0,1fr)); }
}

@media (min-width: 1024px){
  .page-about .about-layout{
    grid-template-columns: 224px minmax(0,1fr);
    gap: clamp(32px,4vw,64px);
    align-items: start;
  }
  .page-about .about-rail{
    position: sticky;
    top: calc(var(--header-h) + 20px);
    padding: 18px 16px;
  }
  .page-about .about-rail__list{
    display: block;
    overflow: visible;
    padding: 0;
  }
  .page-about .about-rail__item{ margin-bottom: 4px; }
  .page-about .about-rail__item:last-child{ margin-bottom: 0; }
  .page-about .about-rail__link{
    display: flex;
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 9px 12px;
    white-space: normal;
  }
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible{
    border-left-color: var(--cyan);
    background: var(--cyan-soft);
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-crumb__link,
  .page-about .about-rail__link,
  .page-about .tl__details,
  .page-about .tl__plus,
  .page-about .tl__plus::after,
  .page-about .about-link{ transition: none; }
}
<<<END>>>