.page-about{
  --about-line: rgba(31,110,156,.34);
  --about-card: rgba(20,71,111,.55);
  --about-soft: rgba(242,247,249,.74);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  background:
    radial-gradient(1100px 460px at 82% 8%, rgba(53,224,208,.13), transparent 70%),
    linear-gradient(162deg, var(--deep), var(--abyss) 72%);
  border-bottom: 1px solid var(--about-line);
  overflow: hidden;
}
.page-about .about-hero::after{
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 90px;
  background: repeating-linear-gradient(90deg, rgba(53,224,208,.07) 0 1px, transparent 1px 34px);
  pointer-events: none;
}
.page-about .about-hero__grid{
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px,5vw,46px);
  max-width: var(--frame-w);
  margin: 0 auto;
  padding: clamp(24px,5vw,46px) var(--edge) clamp(38px,7vw,74px);
}
.page-about .about-hero h1{
  margin: 14px 0 18px;
  font-size: clamp(30px, 7vw, 58px);
  line-height: 1.14;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--foam);
}
.page-about .about-hero__lede{
  max-width: 36em;
  margin: 0 0 16px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--about-soft);
}
.page-about .about-hero__lede + .about-hero__lede{
  padding-left: 14px;
  border-left: 2px solid rgba(53,224,208,.45);
  color: rgba(242,247,249,.66);
}
.page-about .about-hero .ly-actions{
  margin-top: 24px;
}
.page-about .about-hero__facts{
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: 28px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--about-line);
  font-size: 13px;
  color: var(--about-soft);
}
.page-about .about-hero__facts li{
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.page-about .about-hero__facts .ly-mono{
  font-size: 19px;
  color: var(--glow);
  letter-spacing: -.01em;
}
.page-about .about-hero__media{
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(180deg, var(--tide), var(--abyss));
  box-shadow: 0 22px 46px rgba(4,18,31,.5);
}
.page-about .about-hero__media img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 锚点条 ---------- */
.page-about .about-jump{
  position: sticky;
  top: 0;
  z-index: 6;
  background: rgba(6,26,47,.94);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-jump .ly-toc{
  display: flex;
  gap: 6px;
  overflow-x: auto;
  max-width: var(--frame-w);
  margin: 0 auto;
  padding: 10px var(--edge);
  scrollbar-width: thin;
}
.page-about .about-jump .ly-toc__link{
  flex: 0 0 auto;
  padding: 6px 12px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--about-soft);
  border: 1px solid transparent;
  border-radius: 2px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}
.page-about .about-jump .ly-toc__link:hover,
.page-about .about-jump .ly-toc__link:focus-visible{
  color: var(--glow-soft);
  border-color: rgba(53,224,208,.4);
}
.page-about .about-jump .ly-toc__link[aria-current="true"]{
  color: var(--abyss);
  background: var(--glow);
  border-color: var(--glow);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-sec__head{
  max-width: 720px;
  margin-bottom: clamp(24px,4vw,40px);
}
.page-about .about-sec__head h2{
  margin: 10px 0 14px;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -.015em;
  font-weight: 800;
  color: var(--foam);
}
.page-about .about-sec__intro{
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--about-soft);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline{
  background: linear-gradient(180deg, var(--abyss), var(--deep) 120%);
}
.page-about .tl{
  position: relative;
  list-style: none;
  margin: 0;
  padding: 8px 0 8px 30px;
}
.page-about .tl::before{
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--glow), var(--lane) 34%, rgba(31,110,156,.16));
}
.page-about .tl__item{
  position: relative;
  margin-bottom: 22px;
}
.page-about .tl__item::before{
  content: "";
  position: absolute;
  left: -27px;
  top: 22px;
  width: 11px;
  height: 11px;
  background: var(--abyss);
  border: 1px solid var(--glow);
  border-radius: 2px;
  transform: rotate(45deg);
  transition: background-color .2s ease, box-shadow .2s ease;
}
.page-about .tl__item:focus-within::before{
  background: var(--glow);
  box-shadow: 0 0 0 4px rgba(53,224,208,.16);
}
.page-about .tl__card{
  background: linear-gradient(180deg, rgba(20,71,111,.62), rgba(11,46,79,.66));
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--lane);
  border-radius: var(--radius);
  transition: transform .24s ease, box-shadow .24s ease, border-left-color .2s ease;
}
.page-about .tl__card:hover{
  transform: translateY(-3px);
  border-left-color: var(--glow);
  box-shadow: 0 16px 32px rgba(4,18,31,.48);
}
.page-about .tl__card:focus-within{
  border-left-color: var(--glow);
}
.page-about .tl__card > summary{
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 16px 40px 16px 18px;
  cursor: pointer;
  list-style: none;
  position: relative;
}
.page-about .tl__card > summary::-webkit-details-marker{
  display: none;
}
.page-about .tl__card > summary::after{
  content: "＋";
  position: absolute;
  right: 16px;
  top: 16px;
  font-size: 13px;
  color: var(--glow);
  line-height: 1;
}
.page-about .tl__card[open] > summary::after{
  content: "－";
}
.page-about .tl__year{
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--glow);
  background: rgba(53,224,208,.1);
  border: 1px solid rgba(53,224,208,.32);
  border-radius: 2px;
  padding: 3px 8px;
}
.page-about .tl__title{
  font-size: 16.5px;
  font-weight: 600;
  color: var(--foam);
  line-height: 1.5;
}
.page-about .tl__body{
  padding: 0 18px 18px;
}
.page-about .tl__body p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-soft);
}
.page-about .tl__item--media{
  margin: 30px 0 32px;
}
.page-about .tl__item--media::before{
  display: none;
}
.page-about .tl__figure{
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(180deg, var(--tide), var(--deep));
}
.page-about .tl__figure img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .tl__figure figcaption{
  padding: 10px 14px;
  border-top: 1px solid var(--about-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(242,247,249,.6);
}

/* ---------- 团队 ---------- */
.page-about .about-team{
  padding: clamp(34px,6vw,68px) 0;
  background:
    radial-gradient(700px 300px at 15% 0%, rgba(53,224,208,.09), transparent 70%),
    linear-gradient(180deg, var(--deep), var(--abyss));
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-team__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px,4vw,40px);
  align-items: start;
}
.page-about .about-team__media{
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: linear-gradient(180deg, var(--tide), var(--deep));
}
.page-about .about-team__media img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-team__media figcaption{
  padding: 10px 14px;
  border-top: 1px solid var(--about-line);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: rgba(242,247,249,.62);
}
.page-about .about-team__panel h2{
  margin: 10px 0 14px;
  font-size: clamp(23px, 4.2vw, 36px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--foam);
}
.page-about .about-team__intro{
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft);
}
.page-about .team-bar{
  display: flex;
  gap: 3px;
  height: 66px;
  margin: 22px 0 8px;
}
.page-about .team-bar__seg{
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  outline-offset: 3px;
  transition: filter .18s ease;
}
.page-about .team-bar__seg:hover,
.page-about .team-bar__seg:focus-visible{
  filter: brightness(1.12);
}
.page-about .team-bar__seg:nth-child(1){
  flex: 28 1 0;
  color: var(--abyss);
  background: linear-gradient(180deg, var(--glow-soft), var(--glow));
}
.page-about .team-bar__seg:nth-child(2){
  flex: 12 1 0;
  color: var(--foam);
  background: linear-gradient(180deg, var(--lane), var(--tide));
}
.page-about .team-bar__seg:nth-child(3){
  flex: 6 1 0;
  color: var(--glow);
  background: linear-gradient(180deg, var(--tide), var(--deep));
  border: 1px solid rgba(53,224,208,.28);
}
.page-about .team-bar__seg::after{
  content: attr(data-role);
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: 5px 9px;
  background: var(--abyss);
  color: var(--glow-soft);
  border: 1px solid var(--about-line);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .04em;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  z-index: 4;
  transition: opacity .18s ease, transform .18s ease;
}
.page-about .team-bar__seg:hover::after,
.page-about .team-bar__seg:focus-visible::after{
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.page-about .team-bar__seg:last-child::after{
  left: auto;
  right: 0;
  transform: translateY(4px);
}
.page-about .team-bar__seg:last-child:hover::after,
.page-about .team-bar__seg:last-child:focus-visible::after{
  transform: translateY(0);
}
.page-about .team-legend{
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .team-legend li{
  display: grid;
  grid-template-columns: 12px 1fr;
  gap: 10px;
  align-items: start;
  font-size: 13.8px;
  line-height: 1.68;
  color: var(--about-soft);
}
.page-about .team-legend strong{
  color: var(--foam);
  font-weight: 600;
}
.page-about .team-legend__dot{
  display: block;
  width: 12px;
  height: 12px;
  margin-top: 5px;
  border-radius: 2px;
}
.page-about .team-legend__dot--a{ background: var(--glow); }
.page-about .team-legend__dot--b{ background: var(--lane); }
.page-about .team-legend__dot--c{ background: var(--tide); border: 1px solid rgba(53,224,208,.45); }

/* ---------- 版本演进 ---------- */
.page-about .about-vers{
  background: linear-gradient(180deg, var(--abyss), var(--deep) 130%);
}
.page-about .ver{
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.page-about .ver__card{
  position: relative;
  padding: 30px 18px 20px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(20,71,111,.6), rgba(11,46,79,.72));
  transition: transform .24s ease, border-color .2s ease;
}
.page-about .ver__card:hover{
  transform: translateY(-3px);
  border-color: rgba(31,110,156,.7);
}
.page-about .ver__card--now{
  border-color: rgba(53,224,208,.55);
  box-shadow: inset 0 0 0 1px rgba(53,224,208,.12);
}
.page-about .ver__tag{
  position: absolute;
  top: -11px;
  left: 16px;
  padding: 4px 9px;
  background: var(--paper);
  color: var(--ink);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  transform: rotate(-4deg);
  box-shadow: 0 3px 0 rgba(4,18,31,.4);
}
.page-about .ver__card h3{
  margin: 0 0 8px;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--foam);
}
.page-about .ver__card p{
  margin: 0;
  font-size: 13.8px;
  line-height: 1.72;
  color: var(--about-soft);
}
.page-about .ver__note{
  margin: 22px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--glow);
  background: rgba(53,224,208,.06);
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-soft);
}
.page-about .about-vers__actions{
  margin-top: 22px;
  flex-wrap: wrap;
}

/* ---------- 合作网络 ---------- */
.page-about .about-net{
  background: linear-gradient(180deg, var(--deep), var(--abyss));
}
.page-about .net{
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.page-about .net__cell{
  position: relative;
  overflow: hidden;
  padding: 20px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: var(--about-card);
}
.page-about .net__cell::after{
  content: "";
  position: absolute;
  right: -18%;
  bottom: -58%;
  width: 80%;
  height: 140px;
  background: repeating-linear-gradient(90deg, rgba(53,224,208,.1) 0 1px, transparent 1px 16px);
  transform: rotate(-8deg);
  pointer-events: none;
}
.page-about .net__num{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--glow);
}
.page-about .net__label{
  display: block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--foam);
}
.page-about .net__cell p{
  position: relative;
  z-index: 1;
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--about-soft);
}

/* ---------- 服务标准 ---------- */
.page-about .about-std{
  background:
    radial-gradient(800px 320px at 85% 10%, rgba(53,224,208,.1), transparent 70%),
    linear-gradient(180deg, var(--abyss), var(--deep));
  border-top: 1px solid var(--about-line);
}
.page-about .std{
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about .std__card{
  position: relative;
  padding: 26px 20px 18px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--foam) 0%, #e4edf1 100%);
  color: var(--ink);
  box-shadow: 0 10px 0 -7px rgba(232,226,212,.55), 0 20px 38px rgba(4,18,31,.36);
}
.page-about .std__stamp{
  position: absolute;
  top: -12px;
  right: 14px;
  padding: 5px 9px;
  background: var(--paper);
  color: var(--ink);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  transform: rotate(7deg);
  box-shadow: 0 3px 0 rgba(4,18,31,.35);
}
.page-about .std__card h3{
  margin: 0 0 10px;
  font-size: 16.5px;
  line-height: 1.45;
  color: var(--ink);
}
.page-about .std__card > p{
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.72;
  color: #22405a;
}
.page-about .std__more{
  padding-top: 10px;
  border-top: 1px dashed rgba(31,110,156,.42);
}
.page-about .std__more summary{
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--lane);
}
.page-about .std__more summary::-webkit-details-marker{
  display: none;
}
.page-about .std__more summary::after{
  content: "＋";
  font-size: 12px;
}
.page-about .std__more[open] summary::after{
  content: "－";
}
.page-about .std__more p{
  margin: 10px 0 0;
  font-size: 13.2px;
  line-height: 1.72;
  color: #31506b;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta{
  padding: clamp(38px,7vw,76px) 0 clamp(44px,7vw,80px);
  background:
    radial-gradient(900px 300px at 18% 0%, rgba(53,224,208,.15), transparent 70%),
    linear-gradient(180deg, var(--deep), var(--abyss));
  border-top: 1px solid var(--about-line);
}
.page-about .about-cta__inner{
  display: grid;
  gap: 16px;
}
.page-about .about-cta h2{
  margin: 0;
  max-width: 20em;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.26;
  letter-spacing: -.015em;
  font-weight: 800;
  color: var(--foam);
}
.page-about .about-cta p{
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-soft);
}
.page-about .about-cta .ly-actions{
  margin-top: 8px;
  flex-wrap: wrap;
}

/* ---------- 中等屏 ---------- */
@media (min-width: 620px){
  .page-about .net{
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .net__cell--a,
  .page-about .net__cell--b{
    grid-column: span 1;
  }
  .page-about .ver{
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px){
  .page-about .about-hero__grid{
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: center;
  }
  .page-about .about-hero__media{
    clip-path: polygon(7% 0, 100% 0, 100% 100%, 0 100%);
  }
  .page-about .about-hero__media img{
    aspect-ratio: 4 / 5;
  }
  .page-about .about-team__grid{
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 40px;
    align-items: stretch;
  }
  .page-about .about-team__media{
    align-self: stretch;
    display: flex;
    flex-direction: column;
  }
  .page-about .about-team__media img{
    flex: 1;
    aspect-ratio: auto;
    min-height: 320px;
    height: 100%;
  }

  /* 时间线：年份左置 */
  .page-about .tl{
    padding-left: 0;
  }
  .page-about .tl::before{
    left: 122px;
  }
  .page-about .tl__item{
    padding-left: 164px;
  }
  .page-about .tl__item::before{
    left: 116px;
    top: 24px;
  }
  .page-about .tl__item--media{
    padding-left: 164px;
  }
  .page-about .tl__year{
    position: absolute;
    left: 0;
    top: 20px;
    width: 98px;
    text-align: right;
    padding: 0;
    background: none;
    border: 0;
    letter-spacing: .1em;
    font-size: 13px;
  }
  .page-about .tl__item .tl__card{
    transition: transform .24s ease, box-shadow .24s ease, border-left-color .2s ease;
  }
  .page-about .tl__item:nth-child(odd) .tl__card,
  .page-about .tl__item:nth-child(odd) .tl__figure{
    max-width: 56%;
  }
  .page-about .tl__item:nth-child(even) .tl__card,
  .page-about .tl__item:nth-child(even) .tl__figure{
    max-width: 74%;
  }

  .page-about .net{
    grid-template-columns: repeat(6, 1fr);
  }
  .page-about .net__cell--a{ grid-column: span 3; }
  .page-about .net__cell--b{ grid-column: span 3; }
  .page-about .net__cell--c{ grid-column: span 2; }
  .page-about .net__cell--d{ grid-column: span 2; }
  .page-about .net__cell--e{ grid-column: span 2; }

  .page-about .ver{
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .std{
    grid-template-columns: repeat(3, 1fr);
    gap: 26px;
  }
}

@media (min-width: 1100px){
  .page-about .about-hero__grid{
    padding-top: 52px;
    padding-bottom: 84px;
  }
  .page-about .about-team__grid{
    gap: 52px;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .tl__card,
  .page-about .ver__card,
  .page-about .team-bar__seg,
  .page-about .tl__item::before,
  .page-about .team-bar__seg::after{
    transition: none;
  }
  .page-about .tl__card:hover,
  .page-about .ver__card:hover{
    transform: none;
  }
}
<<<END>>>