.page-about{
  --about-hair:1px solid var(--ink-700);
  --about-pad:56px;
  background:var(--ink-900);
  color:var(--paper-050);
}
.page-about .about-crumb{padding-top:calc(var(--bar-h) + 22px);padding-bottom:10px}
.page-about .breadcrumb__item{font-family:var(--font-mono);font-size:12px;color:var(--steel-400)}
.page-about .breadcrumb__link{color:var(--steel-400);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .24s var(--ease),color .24s var(--ease)}
.page-about .breadcrumb__link:hover,.page-about .breadcrumb__link:focus-visible{color:var(--solar-300);border-bottom-color:var(--solar-500)}
.page-about .breadcrumb__sep{color:var(--ink-700);margin:0 8px}

.page-about .about-h2{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(23px,4.4vw,34px);line-height:1.18;letter-spacing:-.02em;
  margin:10px 0 0;color:var(--paper-050);
}
.page-about .section-kicker{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--solar-500);margin:0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position:relative;overflow:hidden;isolation:isolate;
  padding:26px 0 48px;
}
.page-about .about-hero__wedge{
  position:absolute;z-index:-1;top:-24%;right:-46%;width:120%;height:158%;
  background:linear-gradient(165deg,var(--solar-500) 0%,var(--solar-300) 46%,rgba(255,179,71,0) 74%);
  clip-path:polygon(42% 0,100% 0,100% 100%,0 100%);
  opacity:.88;pointer-events:none;
}
.page-about .about-hero__grid{display:grid;gap:30px;align-items:end}
.page-about .about-hero__title{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(31px,7.2vw,60px);line-height:1.06;letter-spacing:-.025em;
  margin:14px 0 20px;color:var(--paper-050);
  text-shadow:0 2px 24px rgba(11,21,34,.55);
}
.page-about .about-hero__lede{
  max-width:46ch;margin:0 0 26px;
  font-size:16px;line-height:1.8;color:var(--text-dim);
}
.page-about .about-hero__actions{display:flex;flex-wrap:wrap;gap:12px}
.page-about .btn{
  font-family:var(--font-body);font-weight:700;font-size:15px;
  text-decoration:none;border-radius:0;padding:13px 22px;
  transition:background-color .24s var(--ease),border-color .24s var(--ease),color .24s var(--ease);
}
.page-about .about-hero__media{
  margin:0;border:var(--about-hair);background:var(--ink-800);
  box-shadow:0 24px 64px rgba(11,21,34,.55);
}
.page-about .about-hero__media img{
  display:block;width:100%;height:auto;aspect-ratio:14/9;object-fit:cover;
}

/* ---------- 起点 ---------- */
.page-about .section{padding:var(--about-pad) 0}
.page-about .about-origin__grid{display:grid;gap:22px}
.page-about .about-origin__mark{
  margin:16px 0 0;font-family:var(--font-mono);font-size:13px;
  letter-spacing:.12em;color:var(--steel-400);
}
.page-about .about-origin__body p{
  margin:0 0 18px;font-size:16px;line-height:1.85;
  color:var(--text-dim);max-width:62ch;
}
.page-about .about-origin__quote{
  margin:26px 0 0;padding:16px 0 16px 20px;
  border-left:2px solid var(--solar-500);
  font-family:var(--font-serif);font-size:18px;line-height:1.7;
  color:var(--solar-100);
}

/* ---------- 四条能力线 ---------- */
.page-about .about-lines__intro{
  margin:16px 0 0;max-width:58ch;font-size:16px;line-height:1.8;color:var(--text-dim);
}
.page-about .about-lines__grid{display:grid;gap:30px;margin-top:32px}
.page-about .about-lines__figure{margin:0;border:var(--about-hair);background:var(--ink-900)}
.page-about .about-lines__figure img{
  display:block;width:100%;height:auto;aspect-ratio:1/1;object-fit:cover;
}
.page-about .about-figcap{
  margin:0;padding:10px 12px;border-top:var(--about-hair);
  font-family:var(--font-mono);font-size:12px;color:var(--steel-400);
}
.page-about .about-lines__list{list-style:none;margin:0;padding:0}
.page-about .about-line{
  display:grid;grid-template-columns:auto 1fr;
  grid-template-areas:"num title" ". text";
  gap:4px 14px;padding:18px 0;
  border-top:var(--about-hair);
  transition:border-color .24s var(--ease),background-color .24s var(--ease);
}
.page-about .about-line:last-child{border-bottom:var(--about-hair)}
.page-about .about-line:hover,.page-about .about-line:focus-within{border-top-color:var(--mint-400)}
.page-about .about-line:hover .about-line__num{color:var(--mint-400)}
.page-about .about-line__num{
  grid-area:num;padding-top:7px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--solar-500);
  transition:color .24s var(--ease);
}
.page-about .about-line__title{
  grid-area:title;margin:0;
  font-family:var(--font-display);font-weight:700;font-size:19px;letter-spacing:-.01em;
  color:var(--paper-050);
}
.page-about .about-line__text{
  grid-area:text;margin:0;font-size:15px;line-height:1.8;color:var(--text-dim);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline__head{max-width:34ch}
.page-about .about-timeline__figure{
  margin:28px 0 0;border:var(--about-hair);background:var(--ink-800);
}
.page-about .about-timeline__figure img{
  display:block;width:100%;height:auto;aspect-ratio:2/1;object-fit:cover;
}
.page-about .about-tl{display:grid;gap:28px;margin-top:38px}
.page-about .about-tl__rail{display:none}
.page-about .about-tl__railcap{
  margin:0 0 14px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.2em;color:var(--steel-400);
}
.page-about .about-tl__years{list-style:none;margin:0;padding:0 0 0 14px;border-left:var(--about-hair)}
.page-about .about-tl__years li{margin:0 0 20px}
.page-about .about-tl__yearlink{
  display:inline-block;font-family:var(--font-mono);font-size:13px;
  letter-spacing:.06em;color:var(--steel-400);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .24s var(--ease),border-color .24s var(--ease);
}
.page-about .about-tl__yearlink:hover,.page-about .about-tl__yearlink:focus-visible{
  color:var(--solar-300);border-bottom-color:var(--solar-500);
}
.page-about .about-tl__items{list-style:none;margin:0;padding:0}
.page-about .about-tl__item{
  position:relative;padding:0 0 34px 26px;
  border-left:1px solid var(--ink-700);
}
.page-about .about-tl__item::before{
  content:"";position:absolute;left:-5px;top:7px;width:9px;height:9px;
  background:var(--ink-900);border:1px solid var(--solar-500);
}
.page-about .about-tl__item:last-child{padding-bottom:0;border-left-color:transparent}
.page-about .about-tl__item--now::before{
  background:var(--mint-400);border-color:var(--mint-400);
  box-shadow:0 0 0 4px rgba(43,232,184,.16);
}
.page-about .about-tl__ver{
  margin:0 0 8px;font-family:var(--font-mono);font-size:12.5px;
  letter-spacing:.08em;color:var(--solar-500);
}
.page-about .about-tl__item--now .about-tl__ver{color:var(--mint-400)}
.page-about .about-tl__title{
  margin:0 0 8px;font-family:var(--font-display);font-weight:700;
  font-size:19px;line-height:1.4;letter-spacing:-.01em;color:var(--paper-050);
}
.page-about .about-tl__text{
  margin:0;max-width:56ch;font-size:15px;line-height:1.8;color:var(--text-dim);
}

/* ---------- 团队 ---------- */
.page-about .about-team__head{max-width:32ch}
.page-about .about-team__bar{
  display:flex;height:14px;margin:28px 0 0;
  border:1px solid var(--ink-700);background:var(--ink-800);
}
.page-about .about-team__seg{height:100%;border-right:1px solid var(--ink-900)}
.page-about .about-team__seg:last-child{border-right:0}
.page-about .about-team__seg--a{width:32.4%;background:var(--solar-500)}
.page-about .about-team__seg--b{width:26.5%;background:var(--solar-300)}
.page-about .about-team__seg--c{width:23.5%;background:var(--mint-400)}
.page-about .about-team__seg--d{width:17.6%;background:var(--volt-500)}
.page-about .about-team__legend{
  list-style:none;margin:28px 0 0;padding:1px;
  display:grid;gap:1px;background:var(--ink-700);
  border:1px solid var(--ink-700);
}
.page-about .about-team__member{background:var(--ink-900);padding:20px 18px}
.page-about .about-team__meta{display:flex;align-items:baseline;gap:12px;margin:0 0 8px}
.page-about .about-team__count{
  font-family:var(--font-mono);font-size:13px;color:var(--solar-300);letter-spacing:.06em;
}
.page-about .about-team__name{
  font-family:var(--font-display);font-weight:700;font-size:17px;color:var(--paper-050);
}
.page-about .about-team__text{margin:0;font-size:14.5px;line-height:1.8;color:var(--text-dim)}
.page-about .about-team__note{
  margin:24px 0 0;padding:16px 18px;max-width:64ch;
  border-left:2px solid var(--mint-400);background:var(--ink-800);
  font-size:14.5px;line-height:1.8;color:var(--text-dim);
}

/* ---------- 覆盖与用户结构 ---------- */
.page-about .about-reach__head{max-width:56ch}
.page-about .about-reach__intro{
  margin:16px 0 0;font-size:16px;line-height:1.8;color:var(--text-dim);
}
.page-about .about-stats{
  display:grid;grid-template-columns:1fr 1fr;gap:1px;
  margin-top:30px;background:var(--ink-700);border:1px solid var(--ink-700);
}
.page-about .about-stat{background:var(--ink-900);padding:20px 16px}
.page-about .about-stat--wide{grid-column:1 / -1}
.page-about .about-stat__num{
  display:inline-block;font-family:var(--font-display);font-weight:900;
  font-size:clamp(30px,6.4vw,42px);line-height:1;letter-spacing:-.02em;
  color:var(--solar-300);
}
.page-about .about-stat__unit{
  font-family:var(--font-body);font-weight:500;font-size:14px;
  letter-spacing:0;color:var(--steel-400);margin-left:5px;
}
.page-about .about-stat__label{
  display:block;margin-top:10px;font-size:13px;line-height:1.7;color:var(--text-dim);
}

/* ---------- 协作与资质 ---------- */
.page-about .about-cred{color:var(--ink-900)}
.page-about .about-cred .about-h2{color:var(--ink-900)}
.page-about .about-cred .section-kicker{color:var(--solar-600)}
.page-about .about-cred__head{max-width:36ch}
.page-about .about-cred__cols{display:grid;gap:0;margin-top:30px}
.page-about .about-cred__col{
  padding:20px 0 24px;border-top:1px solid rgba(11,21,34,.22);
}
.page-about .about-cred__label{
  margin:0 0 10px;font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.14em;color:rgba(11,21,34,.62);
}
.page-about .about-cred__text{
  margin:0;max-width:40ch;font-size:14.5px;line-height:1.85;color:rgba(11,21,34,.86);
}
.page-about .about-next{
  display:grid;gap:1px;margin-top:34px;
  border-top:1px solid rgba(11,21,34,.22);
}
.page-about .about-next__link{
  display:block;padding:16px 0;
  font-family:var(--font-body);font-weight:700;font-size:15px;
  color:var(--ink-900);text-decoration:none;
  border-bottom:1px solid rgba(11,21,34,.22);
  transition:color .24s var(--ease),padding-left .24s var(--ease);
}
.page-about .about-next__link::before{
  content:"→";display:inline-block;margin-right:10px;color:var(--solar-600);
}
.page-about .about-next__link:hover,.page-about .about-next__link:focus-visible{
  color:var(--solar-600);padding-left:6px;
}

@media (min-width:900px){
  .page-about{--about-pad:96px}
  .page-about .about-hero{padding:40px 0 80px}
  .page-about .about-hero__grid{
    grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);
    gap:56px;
  }
  .page-about .about-hero__wedge{right:-30%;width:96%;top:-18%;height:136%}
  .page-about .about-hero__lede{font-size:17px}

  .page-about .about-origin__grid{
    grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);
    gap:64px;align-items:start;
  }

  .page-about .about-lines__grid{
    grid-template-columns:minmax(0,.78fr) minmax(0,1.22fr);
    gap:56px;align-items:start;
  }
  .page-about .about-line{padding:22px 0}

  .page-about .about-tl{grid-template-columns:190px minmax(0,1fr);gap:64px}
  .page-about .about-tl__rail{
    display:block;position:sticky;align-self:start;
    top:calc(var(--bar-h) + 40px);
  }
  .page-about .about-tl__item{padding:0 0 52px 34px}

  .page-about .about-team__legend{grid-template-columns:1fr 1fr}
  .page-about .about-team__member{padding:24px 22px}

  .page-about .about-stats{grid-template-columns:1.5fr 1fr 1fr 1.2fr}
  .page-about .about-stat--wide{grid-column:auto}
  .page-about .about-stat{padding:26px 22px}

  .page-about .about-cred__cols{grid-template-columns:repeat(3,1fr);gap:40px}
  .page-about .about-next{grid-template-columns:1fr 1fr}
}

@media (min-width:1200px){
  .page-about .about-hero__title{font-size:62px}
  .page-about .about-cred__cols{gap:56px}
}

@media (prefers-reduced-motion:reduce){
  .page-about .btn,
  .page-about .about-line,
  .page-about .about-line__num,
  .page-about .about-next__link,
  .page-about .breadcrumb__link,
  .page-about .about-tl__yearlink{transition:none}
}
<<<END>>>