.page-about{
  --about-num-size: clamp(26px, 3.4vw, 40px);
  --about-gap: clamp(28px, 5vw, 64px);
  display: block;
  background: var(--deep);
  color: var(--ice);
}

.page-about .section{
  padding-block: clamp(56px, 8vw, 112px);
}

.page-about .section-title{
  font-weight: 200;
  letter-spacing: -.015em;
  line-height: 1.12;
  margin: 12px 0 0;
}

.page-about .about-num{
  font-size: var(--about-num-size);
  line-height: 1;
  color: var(--cyan);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  padding: clamp(28px, 4vw, 56px) 0 clamp(52px, 7vw, 96px);
  background:
    radial-gradient(120% 100% at 88% 0%, rgba(27, 111, 203, .34), transparent 62%),
    radial-gradient(90% 80% at 0% 100%, rgba(0, 224, 198, .12), transparent 66%);
}

.page-about .about-hero__frame{
  position: relative;
  display: grid;
  gap: var(--about-gap);
  padding: clamp(24px, 4vw, 58px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(158deg, rgba(18, 58, 107, .52), rgba(10, 31, 60, .18));
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after{
  content: "";
  position: absolute;
  width: 44px;
  height: 44px;
  pointer-events: none;
}

.page-about .about-hero__frame::before{
  top: -1px;
  left: -1px;
  border-top: 2px solid var(--orange);
  border-left: 2px solid var(--orange);
  border-top-left-radius: var(--r-lg);
}

.page-about .about-hero__frame::after{
  right: -1px;
  bottom: -1px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  border-bottom-right-radius: var(--r-lg);
}

.page-about .about-hero h1{
  margin: 14px 0 0;
  font-size: clamp(34px, 6.4vw, 74px);
  font-weight: 200;
  line-height: 1.08;
  letter-spacing: -.025em;
  color: var(--ice);
}

.page-about .about-hero__intro{
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.9;
  color: rgba(244, 247, 251, .78);
}

.page-about .about-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(24px, 3vw, 34px) 0 0;
}

.page-about .about-hero__figures{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--line);
}

.page-about .about-hero__figures > div{
  padding: 18px 16px;
  background: rgba(8, 23, 41, .78);
}

.page-about .about-hero__figures dt{
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--scale);
}

.page-about .about-hero__figures dd{
  margin: 0;
}

.page-about .about-hero__figures .data{
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__figures em{
  font-style: normal;
  font-size: .55em;
  color: var(--scale);
  margin-left: 2px;
}

@media (min-width: 980px){
  .page-about .about-hero__frame{
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .85fr);
    align-items: end;
  }
}

/* ---------- 章节索引条 ---------- */
.page-about .about-toc{
  position: sticky;
  top: 0;
  z-index: 3;
  background: rgba(8, 23, 41, .93);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-toc ol{
  display: flex;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc ol::-webkit-scrollbar{
  display: none;
}

.page-about .about-toc a{
  display: block;
  padding: 15px 14px;
  white-space: nowrap;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--scale);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-toc a:hover{
  color: var(--ice);
}

.page-about .about-toc a[aria-current="true"],
.page-about .about-toc a[aria-current="page"]{
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 起点 ---------- */
.page-about .about-why{
  background: linear-gradient(180deg, rgba(18, 58, 107, .16), transparent 70%);
}

.page-about .about-why__inner{
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .about-why__title{
  max-width: 20ch;
  font-size: clamp(30px, 5.2vw, 62px);
}

.page-about .about-why__body{
  display: grid;
  gap: 20px 48px;
  max-width: 940px;
  margin-top: clamp(8px, 1.6vw, 18px);
}

.page-about .about-why__body p{
  margin: 0;
  font-size: 16px;
  line-height: 1.92;
  color: rgba(244, 247, 251, .76);
}

@media (min-width: 880px){
  .page-about .about-why__body{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-why__index{
  display: grid;
  gap: 22px;
  margin: clamp(20px, 3vw, 36px) 0 0;
  padding: clamp(24px, 3vw, 34px) 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}

.page-about .about-why__index li{
  display: grid;
  gap: 10px;
  align-content: start;
  padding-right: 12px;
}

.page-about .about-why__index li:last-child{
  padding-right: 0;
}

.page-about .about-why__index span:last-child{
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--scale);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__head{
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-bottom: clamp(38px, 5vw, 68px);
}

.page-about .about-timeline__lede{
  margin: 20px 0 0;
  max-width: 40ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 247, 251, .7);
}

.page-about .about-timeline__fig{
  margin: 0 auto;
  width: min(320px, 100%);
  aspect-ratio: 1 / 1;
}

.page-about .about-timeline__fig img{
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (min-width: 900px){
  .page-about .about-timeline__head{
    grid-template-columns: minmax(0, 1fr) minmax(0, 330px);
    align-items: center;
  }
  .page-about .about-timeline__fig{
    margin: 0 0 0 auto;
  }
}

.page-about .about-timeline__list{
  position: relative;
  margin: 0;
  padding: 6px 0 6px 36px;
  list-style: none;
}

.page-about .about-timeline__list::before{
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(0, 224, 198, .5) 48%, rgba(0, 224, 198, 0) 98%);
}

.page-about .about-timeline__item{
  position: relative;
  padding-bottom: clamp(28px, 3.6vw, 44px);
}

.page-about .about-timeline__item:last-child{
  padding-bottom: 0;
}

.page-about .about-timeline__item::before{
  content: "";
  position: absolute;
  left: -36px;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--deep);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 224, 198, .09);
}

.page-about .about-timeline__year{
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-timeline__item h3{
  margin: 0 0 10px;
  font-size: clamp(19px, 2.2vw, 25px);
  font-weight: 500;
  letter-spacing: -.01em;
  color: var(--ice);
}

.page-about .about-timeline__item p{
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.88;
  color: rgba(244, 247, 251, .7);
}

.page-about .about-timeline__item a{
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 26, .45);
}

.page-about .about-timeline__item a:hover{
  border-bottom-color: var(--orange);
}

@media (min-width: 900px){
  .page-about .about-timeline__item:nth-child(even){
    margin-left: clamp(0px, 7vw, 110px);
  }
}

/* ---------- 数据流程 ---------- */
.page-about .about-flow__lede{
  margin: 18px 0 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 247, 251, .72);
}

.page-about .about-flow__steps{
  position: relative;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
  margin: clamp(34px, 4.5vw, 60px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__step{
  position: relative;
  z-index: 1;
  height: 100%;
  padding: clamp(20px, 2.4vw, 28px);
  border: 1px solid var(--line);
  border-radius: 28px 14px 32px 18px;
  background: linear-gradient(152deg, rgba(18, 58, 107, .78), rgba(10, 31, 60, .55));
}

.page-about .about-flow__step::before{
  content: "";
  position: absolute;
  top: 0;
  left: clamp(20px, 2.4vw, 28px);
  right: clamp(20px, 2.4vw, 28px);
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 107, 26, 0));
}

.page-about .about-flow__steps > li:nth-child(2) .about-flow__step::before{
  background: linear-gradient(90deg, var(--orange-soft), rgba(255, 154, 77, 0));
}

.page-about .about-flow__steps > li:nth-child(3) .about-flow__step::before{
  background: linear-gradient(90deg, var(--cyan), rgba(0, 224, 198, 0));
}

.page-about .about-flow__steps > li:nth-child(4) .about-flow__step::before{
  background: linear-gradient(90deg, var(--cyan-data), rgba(22, 168, 199, 0));
}

.page-about .about-flow__step .index{
  color: var(--scale);
  margin: 0 0 12px;
}

.page-about .about-flow__step h3{
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 500;
  color: var(--ice);
}

.page-about .about-flow__step p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(244, 247, 251, .72);
}

.page-about .about-flow__note{
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 18px 22px;
  border-left: 2px solid var(--amber);
  background: rgba(255, 194, 75, .07);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(244, 247, 251, .78);
}

@media (min-width: 900px){
  .page-about .about-flow__steps{
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .about-flow__steps::before{
    content: "";
    position: absolute;
    left: 5%;
    right: 5%;
    top: 36%;
    z-index: 0;
    border-top: 1px dashed rgba(0, 224, 198, .45);
    pointer-events: none;
  }
  .page-about .about-flow__steps > li:nth-child(2){
    margin-top: clamp(22px, 4vw, 58px);
  }
  .page-about .about-flow__steps > li:nth-child(3){
    margin-top: clamp(8px, 1.8vw, 26px);
  }
  .page-about .about-flow__steps > li:nth-child(4){
    margin-top: clamp(32px, 6vw, 88px);
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team__lede{
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 247, 251, .72);
}

.page-about .about-team__fig{
  margin: clamp(30px, 4vw, 48px) 0 0;
}

.page-about .about-team__fig img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-team__cols{
  display: grid;
  gap: clamp(26px, 3.4vw, 40px);
  margin-top: clamp(32px, 4.4vw, 56px);
}

.page-about .about-team__roles{
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__roles li{
  padding: clamp(18px, 2.2vw, 24px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team__roles li:first-child{
  padding-top: 0;
}

.page-about .about-team__roles li:last-child{
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-team__roles h3{
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 500;
  color: var(--ice);
}

.page-about .about-team__roles p{
  margin: 0;
  max-width: 56ch;
  font-size: 14.8px;
  line-height: 1.85;
  color: rgba(244, 247, 251, .72);
}

.page-about .about-team__metric{
  margin-top: 10px !important;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px !important;
  letter-spacing: .04em;
  color: var(--cyan-data) !important;
}

.page-about .about-team__rule{
  display: none;
}

.page-about .about-team__facts{
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__facts li{
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(0, 1fr);
  align-items: baseline;
  gap: 18px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-team__facts li:last-child{
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-team__facts span:last-child{
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(244, 247, 251, .74);
}

@media (min-width: 900px){
  .page-about .about-team__cols{
    grid-template-columns: minmax(0, 1.05fr) 1px minmax(0, .95fr);
    gap: clamp(30px, 4vw, 58px);
    align-items: stretch;
  }
  .page-about .about-team__rule{
    display: block;
    align-self: stretch;
    background: linear-gradient(180deg, transparent, var(--line-strong) 14%, var(--line-strong) 86%, transparent);
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__grid{
  display: grid;
  gap: clamp(30px, 4vw, 56px);
  margin-top: clamp(30px, 4vw, 52px);
}

.page-about .about-eco__orbit{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-eco__tag{
  position: relative;
  display: grid;
  gap: 6px;
  place-items: center;
  padding: 16px 14px;
  text-align: center;
  border: 1px solid rgba(0, 224, 198, .32);
  border-radius: var(--r-lg);
  background: rgba(8, 23, 41, .62);
  transition: border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .about-eco__tag:hover,
.page-about .about-eco__tag:focus-within{
  border-color: var(--orange);
  background: rgba(255, 107, 26, .14);
  outline: none;
}

.page-about .about-eco__tag:focus-visible{
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-eco__label{
  font-size: 14.5px;
  letter-spacing: .04em;
  color: var(--ice);
}

.page-about .about-eco__desc{
  font-size: 12.8px;
  line-height: 1.7;
  color: rgba(244, 247, 251, .66);
}

.page-about .about-eco__core{
  grid-column: 1 / -1;
  display: grid;
  place-content: center;
  gap: 8px;
  padding: clamp(24px, 3vw, 32px);
  text-align: center;
  border: 1px dashed rgba(0, 224, 198, .5);
  border-radius: var(--r-lg);
  background: radial-gradient(circle at 50% 35%, rgba(0, 224, 198, .22), rgba(18, 58, 107, .78));
}

.page-about .about-eco__core .index{
  color: var(--cyan);
}

.page-about .about-eco__core strong{
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 300;
  letter-spacing: -.01em;
  color: var(--ice);
}

.page-about .about-eco__core em{
  font-style: normal;
  color: var(--orange);
}

.page-about .about-eco__core span:last-child{
  font-size: 13px;
  color: var(--scale);
}

.page-about .about-eco__fig{
  margin: 0;
  aspect-ratio: 3 / 2;
}

.page-about .about-eco__fig img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (min-width: 900px){
  .page-about .about-eco__orbit{
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: center;
    justify-items: center;
    gap: clamp(14px, 2vw, 26px);
  }
  .page-about .about-eco__tag{
    width: 100%;
    min-height: 78px;
    border-radius: 999px;
    padding: 18px 16px;
  }
  .page-about .about-eco__desc{
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    z-index: 4;
    width: max(200px, 15em);
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: var(--r-md);
    background: rgba(8, 23, 41, .97);
    opacity: 0;
    transform: translate(-50%, 6px);
    pointer-events: none;
    transition: opacity .22s var(--ease), transform .22s var(--ease);
  }
  .page-about .about-eco__tag:hover .about-eco__desc,
  .page-about .about-eco__tag:focus-within .about-eco__desc{
    opacity: 1;
    transform: translate(-50%, 0);
  }
  .page-about .about-eco__tag:nth-child(1){ grid-area: 1 / 1; }
  .page-about .about-eco__tag:nth-child(2){ grid-area: 1 / 3; }
  .page-about .about-eco__tag:nth-child(3){ grid-area: 2 / 1; }
  .page-about .about-eco__tag:nth-child(4){ grid-area: 2 / 3; }
  .page-about .about-eco__tag:nth-child(5){ grid-area: 3 / 1; }
  .page-about .about-eco__tag:nth-child(6){ grid-area: 3 / 3; }
  .page-about .about-eco__core{
    grid-area: 2 / 2;
    grid-column: auto;
    width: min(100%, 230px);
    aspect-ratio: 1 / 1;
    border-radius: 50%;
    align-content: center;
  }
}

@media (min-width: 1060px){
  .page-about .about-eco__grid{
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: center;
  }
}

/* ---------- 三件坚持 ---------- */
.page-about .section--ice{
  color: var(--ink);
}

.page-about .section--ice .section-index{
  color: #5A6675;
}

.page-about .about-pledge__list{
  display: grid;
  gap: clamp(28px, 3.6vw, 48px);
  margin: clamp(32px, 4.4vw, 56px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-pledge__list li{
  padding-top: 24px;
  border-top: 2px solid rgba(11, 17, 24, .12);
}

.page-about .about-pledge__list li:first-child{
  border-top-color: var(--orange);
}

.page-about .about-pledge__list li:nth-child(2){
  border-top-color: var(--cyan-data);
}

.page-about .about-pledge__list li:nth-child(3){
  border-top-color: var(--signal);
}

.page-about .about-pledge__list .index{
  color: #6C7885;
}

.page-about .about-pledge__list h3{
  margin: 14px 0 12px;
  font-size: clamp(26px, 3.4vw, 44px);
  font-weight: 200;
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about .about-pledge__list p{
  margin: 0;
  font-size: 15px;
  line-height: 1.88;
  color: rgba(11, 17, 24, .74);
}

@media (min-width: 880px){
  .page-about .about-pledge__list{
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(26px, 3.4vw, 46px);
  }
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta{
  padding: clamp(48px, 7vw, 96px) 0;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(100% 130% at 12% 0%, rgba(255, 107, 26, .22), transparent 62%),
    linear-gradient(180deg, var(--deep-2), var(--deep));
}

.page-about .about-cta__inner{
  display: grid;
  gap: 26px;
}

.page-about .about-cta h2{
  margin: 12px 0 14px;
  font-size: clamp(26px, 3.8vw, 46px);
  font-weight: 200;
  line-height: 1.16;
  letter-spacing: -.02em;
  color: var(--ice);
}

.page-about .about-cta p{
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.88;
  color: rgba(244, 247, 251, .74);
}

.page-about .about-cta__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 880px){
  .page-about .about-cta__inner{
    grid-template-columns: minmax(0, 1.35fr) auto;
    align-items: center;
    gap: 52px;
  }
}
<<<END>>>