.page-about{
  --about-chapter-pad: clamp(40px, 7vw, 88px);
  --about-tl-indent: clamp(24px, 4vw, 36px);
  background:
    radial-gradient(110% 70% at 88% -6%, rgba(122, 92, 255, .16), transparent 62%),
    radial-gradient(80% 55% at -10% 6%, rgba(45, 226, 230, .12), transparent 58%),
    var(--bg);
  color: var(--text);
  padding-bottom: clamp(48px, 8vw, 104px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 60px) var(--gutter) clamp(30px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(170deg, rgba(11, 30, 54, .95), rgba(7, 20, 38, .6) 55%, transparent);
}
.page-about .about-hero::before{
  content: "";
  position: absolute;
  left: 42%;
  right: -12%;
  bottom: -34%;
  height: 74%;
  background: linear-gradient(140deg, rgba(45, 226, 230, .2), rgba(122, 92, 255, .14) 48%, transparent 72%);
  clip-path: polygon(0 0, 100% 20%, 100% 100%, 0 80%);
  pointer-events: none;
}
.page-about .about-hero__ridge{
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: clamp(90px, 16vw, 180px);
  color: var(--cyan);
  opacity: .16;
  pointer-events: none;
}
.page-about .about-hero__inner{
  position: relative;
  z-index: 1;
  width: var(--shell);
  margin: 0 auto;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}
.page-about .about-hero h1{
  margin: 14px 0 0;
  font-size: clamp(32px, 6vw, 74px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -.02em;
  max-width: 17ch;
}
.page-about .about-hero__hl{
  background: linear-gradient(180deg, transparent 64%, rgba(255, 159, 28, .34) 64%);
}
.page-about .about-hero .lede{
  margin-top: clamp(14px, 2.4vw, 22px);
  max-width: 54ch;
  color: var(--text-dim);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}
.page-about .about-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .about-hero__stats{
  align-self: end;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  box-shadow: 9px 9px 0 rgba(45, 226, 230, .14);
}
.page-about .about-stat{
  background: var(--ink-2);
  padding: clamp(12px, 2.2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}
.page-about .about-stat__num{
  font-family: var(--font-mono);
  font-size: clamp(21px, 3.2vw, 30px);
  font-weight: 700;
  letter-spacing: -.03em;
  color: var(--cyan);
  white-space: nowrap;
}
.page-about .about-stat--amber .about-stat__num{ color: var(--amber); }
.page-about .about-stat__label{
  font-size: 13px;
  color: var(--steel);
  letter-spacing: .04em;
}

/* ---------- 主体框架 ---------- */
.page-about .about-shell{
  width: var(--shell);
  margin: 0 auto;
  padding-top: clamp(32px, 5vw, 64px);
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}
.page-about .about-toc{
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(11, 30, 54, .92), rgba(7, 20, 38, .92));
  box-shadow: 6px 6px 0 rgba(45, 226, 230, .1);
  padding: clamp(14px, 2.4vw, 20px);
}
.page-about .about-toc__title{
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--amber);
}
.page-about .about-toc__list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.page-about .about-toc__list a{
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 6px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  border-left: 2px solid transparent;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}
.page-about .about-toc__list a .mono{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--steel);
  letter-spacing: .08em;
}
.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible{
  color: var(--mist);
  border-left-color: var(--cyan);
  background: rgba(45, 226, 230, .07);
}
.page-about .about-toc__list a:hover .mono,
.page-about .about-toc__list a:focus-visible .mono{ color: var(--cyan); }
.page-about .about-toc__foot{
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel);
  word-break: break-all;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter{
  padding-top: var(--about-chapter-pad);
  border-top: 1px solid var(--line-soft);
}
.page-about .about-chapter:first-child{
  padding-top: 0;
  border-top: 0;
}
.page-about .about-chapter__head{
  display: flex;
  align-items: baseline;
  gap: clamp(10px, 2vw, 18px);
  margin-bottom: clamp(16px, 3vw, 28px);
}
.page-about .about-chapter__no{
  flex: none;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
  padding-top: 6px;
}
.page-about .about-chapter h2{
  margin: 0;
  font-size: clamp(23px, 3.6vw, 40px);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -.02em;
}
.page-about .about-chapter__grid{
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}
.page-about .about-chapter__text p{
  margin: 0 0 14px;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--text-dim);
  max-width: 62ch;
}
.page-about .about-chapter__text p:last-child{ margin-bottom: 0; }
.page-about .about-chapter__text--follow{ margin-top: clamp(16px, 2.6vw, 26px); }

.page-about .about-aside{
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  background: rgba(11, 30, 54, .8);
  padding: clamp(16px, 2.6vw, 24px);
}
.page-about .about-aside__title{
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--cyan);
}
.page-about .about-aside__list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 14px;
  color: var(--text-dim);
}
.page-about .about-aside__list li{ display: flex; align-items: baseline; gap: 8px; }
.page-about .about-aside__list .mono{
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--mist);
  letter-spacing: -.02em;
}
.page-about .about-aside__note{
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 图 ---------- */
.page-about .about-figure{
  margin: 0 0 clamp(20px, 3.4vw, 32px);
  border: 1px solid var(--line);
  background: var(--ink-2);
  box-shadow: 8px 8px 0 rgba(122, 92, 255, .12);
  overflow: hidden;
}
.page-about .about-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure figcaption{
  padding: 10px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--steel);
  border-top: 1px solid var(--line-soft);
}
.page-about .about-figure--tight{ margin-bottom: 0; }
.page-about .about-figure--wide img{
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 时间线 ---------- */
.page-about .about-tl{
  list-style: none;
  margin: clamp(20px, 3vw, 34px) 0 0;
  padding: 0 0 0 var(--about-tl-indent);
  position: relative;
}
.page-about .about-tl::before{
  content: "";
  position: absolute;
  left: 0;
  top: .7em;
  bottom: .7em;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(45, 226, 230, .45) 55%, rgba(45, 226, 230, .05) 100%);
}
.page-about .about-tl__item{
  position: relative;
  padding-bottom: clamp(20px, 3.4vw, 32px);
}
.page-about .about-tl__item::before{
  content: "";
  position: absolute;
  left: calc(-1 * var(--about-tl-indent));
  top: .45em;
  margin-left: -4px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transition: background-color .2s ease, border-color .2s ease;
}
.page-about .about-tl__item:hover::before{
  background: var(--amber);
  border-color: var(--amber);
}
.page-about .about-tl__year{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan-soft);
  transition: color .2s ease;
}
.page-about .about-tl__item:hover .about-tl__year{ color: var(--amber); }
.page-about .about-tl__title{
  margin: 10px 0 6px;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--mist);
}
.page-about .about-tl__text{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 60ch;
}
.page-about .about-tl__extra{
  margin: 8px 0 0;
  padding-left: 10px;
  border-left: 2px solid rgba(255, 159, 28, .55);
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
  max-width: 58ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team{
  list-style: none;
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-team__row{
  display: grid;
  grid-template-columns: minmax(80px, 104px) minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(8px, 1.8vw, 16px);
}
.page-about .about-team__label{
  font-size: 13px;
  color: var(--text-dim);
}
.page-about .about-team__bar{
  display: block;
  height: 10px;
  background: rgba(143, 163, 184, .16);
  border: 1px solid var(--line-soft);
}
.page-about .about-team__bar span{
  display: block;
  height: 100%;
  width: var(--w, 50%);
  background: linear-gradient(90deg, rgba(45, 226, 230, .9), rgba(122, 92, 255, .85));
}
.page-about .about-team__num{
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--mist);
  min-width: 2.5ch;
  text-align: right;
}

/* ---------- 服务响应 ---------- */
.page-about .about-metrics{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-bottom: clamp(16px, 2.6vw, 26px);
}
.page-about .about-metric{
  background: linear-gradient(160deg, rgba(11, 30, 54, .95), rgba(7, 20, 38, .95));
  padding: clamp(14px, 2.4vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .about-metric__num{
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 27px);
  font-weight: 700;
  color: var(--amber);
  letter-spacing: -.03em;
  white-space: nowrap;
}
.page-about .about-metric__unit{
  font-size: .55em;
  margin-left: 3px;
  color: var(--steel);
  letter-spacing: 0;
}
.page-about .about-metric__label{
  font-size: 13px;
  color: var(--steel);
}

/* ---------- 认证 ---------- */
.page-about .about-certs{
  display: grid;
  gap: clamp(12px, 2.4vw, 20px);
  margin: clamp(18px, 3vw, 28px) 0;
}
.page-about .about-cert{
  border: 1px solid var(--line-glow);
  background: linear-gradient(150deg, rgba(45, 226, 230, .08), rgba(11, 30, 54, .92) 62%);
  padding: clamp(16px, 2.6vw, 24px);
  box-shadow: 6px 6px 0 rgba(45, 226, 230, .1);
}
.page-about .about-cert--amber{
  border-color: rgba(255, 159, 28, .45);
  background: linear-gradient(150deg, rgba(255, 159, 28, .09), rgba(11, 30, 54, .92) 62%);
  box-shadow: 6px 6px 0 rgba(255, 159, 28, .12);
}
.page-about .about-cert__code{
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan);
}
.page-about .about-cert--amber .about-cert__code{ color: var(--amber); }
.page-about .about-cert__title{
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  color: var(--mist);
}
.page-about .about-cert__text{
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 合作 ---------- */
.page-about .about-partners{
  display: grid;
  gap: clamp(14px, 2.6vw, 22px);
}
.page-about .about-partner{
  border-top: 3px solid var(--cyan);
  border-bottom: 1px solid var(--line);
  padding: clamp(14px, 2.4vw, 22px) 0;
}
.page-about .about-partner--amber{ border-top-color: var(--amber); }
.page-about .about-partner__num{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan-soft);
}
.page-about .about-partner--amber .about-partner__num{ color: var(--sand); }
.page-about .about-partner__title{
  margin: 10px 0 6px;
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 800;
  color: var(--mist);
}
.page-about .about-partner__text{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 下一步 ---------- */
.page-about .about-next{
  margin-top: clamp(36px, 6vw, 72px);
  padding-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--line);
}
.page-about .about-next__head h2{
  margin: 8px 0 0;
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.2;
}
.page-about .about-next__lede{
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .about-next__grid{
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .about-next__card{
  display: block;
  text-decoration: none;
  color: inherit;
  border-left: 3px solid var(--cyan);
  padding: clamp(16px, 2.4vw, 22px);
  background: linear-gradient(160deg, rgba(11, 30, 54, .92), rgba(7, 20, 38, .92));
}
.page-about .about-next__card:hover{
  border-left-color: var(--amber);
}
.page-about .about-next__card .card__meta{
  display: block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--steel);
}
.page-about .about-next__card .card__title{
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--mist);
}
.page-about .about-next__card .card__text{
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px){
  .page-about .about-chapter__grid{
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-chapter__grid--rev{
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  }
  .page-about .about-certs{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-partners{
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(18px, 3vw, 30px);
  }
}

@media (min-width: 960px){
  .page-about .about-hero__inner{
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .8fr);
    align-items: end;
  }
  .page-about .about-shell{
    grid-template-columns: 206px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }
  .page-about .about-toc{
    position: sticky;
    top: clamp(84px, 11vh, 112px);
  }
  .page-about .about-aside{
    margin-top: 6px;
  }
}

@media (max-width: 420px){
  .page-about .about-stat__num{
    font-size: 19px;
  }
  .page-about .about-team__row{
    grid-template-columns: minmax(70px, 88px) minmax(0, 1fr) auto;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-toc__list a,
  .page-about .about-tl__item::before,
  .page-about .about-tl__year{
    transition: none;
  }
}
<<<END>>>

.page-about {
  --w: 1rem;
}