.page-about{
  --ab-axis-w:104px;
  position:relative;
  display:block;
  background:
    radial-gradient(1100px 560px at 84% -6%, rgba(43,240,208,.09), transparent 62%),
    radial-gradient(860px 480px at 2% 26%, rgba(255,162,58,.06), transparent 58%),
    var(--ink-950);
  color:var(--mist-050);
  font-family:var(--font-body);
  overflow-x:hidden;
  -webkit-text-size-adjust:100%;
}

.page-about .ab-shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.page-about .ab-crumbs{
  padding-top:18px;
}

.page-about .breadcrumbs{
  margin:0;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero{
  padding:22px 0 48px;
}

.page-about .ab-hero__inner{
  display:grid;
  gap:28px;
}

.page-about .ab-hero__lead{
  min-width:0;
}

.page-about .ab-hero h1{
  margin:10px 0 0;
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(30px,7.2vw,54px);
  line-height:1.1;
  letter-spacing:.02em;
  color:var(--mist-050);
}

.page-about .ab-hero__intro{
  margin:16px 0 0;
  max-width:36em;
  font-size:16px;
  line-height:1.78;
  color:var(--mist-300);
}

.page-about .ab-hero__actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:24px;
}

.page-about .ab-hero__figure{
  position:relative;
  margin:0;
  border:1px solid var(--line-600);
  border-radius:var(--radius);
  overflow:hidden;
  background:var(--pitch-700);
  box-shadow:0 20px 44px -30px rgba(0,0,0,.95);
}

.page-about .ab-hero__figure img{
  display:block;
  width:100%;
  height:auto;
  max-height:380px;
  object-fit:cover;
}

.page-about .ab-hero__figure figcaption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:10px 14px;
  font-size:12px;
  letter-spacing:.02em;
  color:var(--mist-300);
  background:linear-gradient(180deg,transparent,rgba(10,15,13,.9));
}

/* ---------- 数字条 ---------- */
.page-about .ab-stats{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  margin:28px 0 0;
  padding:0;
  list-style:none;
  background:var(--line-600);
  border:1px solid var(--line-600);
  border-radius:var(--radius);
  overflow:hidden;
}

.page-about .ab-stats__item{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:18px 16px;
  background:var(--ink-950);
}

.page-about .ab-stats__num{
  font-family:var(--font-mono);
  font-size:26px;
  line-height:1;
  letter-spacing:.04em;
  color:var(--cyan-400);
}

.page-about .ab-stats__label{
  font-size:12.5px;
  line-height:1.55;
  color:var(--mist-300);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline{
  position:relative;
  overflow:hidden;
  padding:56px 0;
  border-top:1px solid var(--line-600);
  border-bottom:1px solid var(--line-600);
  background:linear-gradient(180deg,var(--pitch-900) 0%,var(--ink-950) 100%);
}

.page-about .ab-timeline__bg{
  position:absolute;
  inset:0;
  opacity:.16;
  pointer-events:none;
}

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

.page-about .ab-timeline .ab-shell{
  position:relative;
  z-index:1;
}

.page-about .ab-tl{
  list-style:none;
  margin:26px 0 0;
  padding:0;
}

.page-about .ab-tl__item{
  position:relative;
  padding:0 0 30px 26px;
}

.page-about .ab-tl__item::before{
  content:"";
  position:absolute;
  left:4px;
  top:20px;
  bottom:2px;
  width:1px;
  background:linear-gradient(180deg,var(--line-600),rgba(30,58,51,0));
}

.page-about .ab-tl__item::after{
  content:"";
  position:absolute;
  left:0;
  top:6px;
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--cyan-400);
  box-shadow:0 0 0 3px rgba(43,240,208,.14);
  transition:transform .2s ease,box-shadow .2s ease;
}

.page-about .ab-tl__item:hover::after{
  transform:scale(1.4);
  box-shadow:0 0 0 6px rgba(43,240,208,.18);
}

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

.page-about .ab-tl__item:last-child::before{
  display:none;
}

.page-about .ab-tl__body{
  min-width:0;
}

.page-about .ab-tl__year{
  margin:0;
  font-family:var(--font-mono);
  font-size:14px;
  line-height:1.2;
  letter-spacing:.16em;
  color:var(--cyan-400);
}

.page-about .ab-tl__title{
  margin:6px 0 0;
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  line-height:1.32;
  letter-spacing:.02em;
  color:var(--mist-050);
}

.page-about .ab-tl__text{
  margin:8px 0 0;
  max-width:38em;
  font-size:15px;
  line-height:1.76;
  color:var(--mist-300);
}

/* ---------- 展开组 ---------- */
.page-about .disclosure{
  margin-top:14px;
  border-top:1px solid var(--line-600);
}

.page-about .disclosure__trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  width:100%;
  padding:12px 0;
  background:none;
  border:0;
  font-family:inherit;
  font-size:13px;
  letter-spacing:.02em;
  color:var(--mist-300);
  text-align:left;
  cursor:pointer;
  transition:color .18s ease;
}

.page-about .disclosure__trigger:hover,
.page-about .disclosure__trigger:focus-visible{
  color:var(--cyan-400);
}

.page-about .disclosure__trigger:focus-visible{
  outline:1px solid var(--cyan-400);
  outline-offset:3px;
}

.page-about .disclosure__icon{
  position:relative;
  flex:0 0 auto;
  width:12px;
  height:12px;
}

.page-about .disclosure__icon::before{
  content:"";
  position:absolute;
  left:0;
  top:5px;
  width:12px;
  height:1px;
  background:currentColor;
}

.page-about .disclosure__icon::after{
  content:"";
  position:absolute;
  left:5px;
  top:0;
  width:1px;
  height:12px;
  background:currentColor;
  transition:transform .18s ease;
}

.page-about .disclosure__trigger[aria-expanded="true"] .disclosure__icon::after{
  transform:scaleY(0);
}

.page-about .disclosure__panel{
  padding:0 0 14px;
  font-size:14px;
  line-height:1.76;
  color:var(--mist-300);
}

.page-about .disclosure__panel p{
  margin:0;
  max-width:36em;
}

/* ---------- 团队 ---------- */
.page-about .ab-team-section{
  padding:56px 0;
}

.page-about .ab-team{
  list-style:none;
  margin:26px 0 0;
  padding:0;
  border-top:1px solid var(--line-600);
}

.page-about .ab-team__row{
  display:grid;
  grid-template-columns:58px minmax(0,1fr);
  gap:2px 16px;
  padding:18px 0;
  border-bottom:1px solid var(--line-600);
  background:linear-gradient(90deg,rgba(43,240,208,0),rgba(43,240,208,0));
  transition:background .2s ease;
}

.page-about .ab-team__row:hover{
  background:linear-gradient(90deg,rgba(22,69,58,.55),rgba(22,69,58,0) 78%);
}

.page-about .ab-team__num{
  grid-row:1 / span 2;
  align-self:start;
  font-family:var(--font-mono);
  font-size:27px;
  line-height:1;
  letter-spacing:.02em;
  color:var(--cyan-400);
}

.page-about .ab-team__role{
  margin:0;
  font-family:var(--font-display);
  font-size:17px;
  font-weight:800;
  letter-spacing:.02em;
  color:var(--mist-050);
}

.page-about .ab-team__desc{
  margin:0;
  font-size:14.5px;
  line-height:1.72;
  color:var(--mist-300);
}

/* ---------- 流程 ---------- */
.page-about .ab-flow{
  padding:56px 0;
  border-top:1px solid var(--line-600);
  border-bottom:1px solid var(--line-600);
  background:linear-gradient(160deg,var(--pitch-900) 0%,var(--ink-950) 72%);
}

.page-about .ab-flow__figure{
  position:relative;
  margin:26px 0 0;
  border:1px solid var(--line-600);
  border-radius:var(--radius);
  overflow:hidden;
  background:var(--pitch-700);
}

.page-about .ab-flow__figure img{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:7 / 4;
  object-fit:cover;
}

.page-about .ab-flow__figure figcaption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:12px 14px;
  font-size:12.5px;
  color:var(--mist-300);
  background:linear-gradient(180deg,transparent,rgba(10,15,13,.92));
}

.page-about .ab-flow__list{
  display:grid;
  gap:1px;
  margin:20px 0 0;
  padding:0;
  list-style:none;
  background:var(--line-600);
  border:1px solid var(--line-600);
  border-radius:var(--radius);
  overflow:hidden;
}

.page-about .ab-flow__step{
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:20px 18px;
  background:var(--pitch-900);
}

.page-about .ab-flow__idx{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--amber-500);
}

.page-about .ab-flow__step h3{
  margin:0;
  font-family:var(--font-display);
  font-size:17px;
  font-weight:800;
  letter-spacing:.02em;
  color:var(--mist-050);
}

.page-about .ab-flow__step p{
  margin:0;
  font-size:14px;
  line-height:1.7;
  color:var(--mist-300);
}

.page-about .ab-flow__note{
  margin:20px 0 0;
  max-width:40em;
  font-size:14px;
  line-height:1.76;
  color:var(--mist-300);
  padding-left:16px;
  border-left:2px solid var(--amber-500);
}

/* ---------- 原则 ---------- */
.page-about .ab-rules{
  padding:56px 0;
}

.page-about .ab-rules__list{
  display:grid;
  gap:26px;
  margin:30px 0 0;
  padding:0;
  list-style:none;
}

.page-about .ab-rules__item{
  position:relative;
  padding-top:20px;
  border-top:2px solid var(--line-600);
}

.page-about .ab-rules__item::before{
  content:"";
  position:absolute;
  left:0;
  top:-2px;
  width:38px;
  height:2px;
  background:var(--grad-path);
}

.page-about .ab-rules__idx{
  display:block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--mist-300);
}

.page-about .ab-rules__item h3{
  margin:8px 0 0;
  font-family:var(--font-display);
  font-size:18px;
  font-weight:800;
  line-height:1.35;
  letter-spacing:.02em;
  color:var(--mist-050);
}

.page-about .ab-rules__item p{
  margin:10px 0 0;
  font-size:14.5px;
  line-height:1.75;
  color:var(--mist-300);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next{
  padding:0 0 64px;
}

.page-about .ab-next__panel{
  position:relative;
  overflow:hidden;
  padding:30px 22px;
  border:1px solid var(--line-600);
  border-radius:var(--radius);
  background:linear-gradient(135deg,rgba(14,43,35,.94) 0%,rgba(10,15,13,.96) 58%,rgba(16,46,54,.9) 100%);
}

.page-about .ab-next__panel::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:100%;
  height:2px;
  background:var(--grad-path);
}

.page-about .ab-next h2{
  margin:10px 0 0;
  font-family:var(--font-display);
  font-size:clamp(24px,5vw,34px);
  font-weight:800;
  line-height:1.16;
  letter-spacing:.02em;
  color:var(--mist-050);
}

.page-about .ab-next__lead > p{
  margin:12px 0 0;
  max-width:34em;
  font-size:15px;
  line-height:1.75;
  color:var(--mist-300);
}

.page-about .ab-next__actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:22px;
}

.page-about .ab-next__links{
  margin:26px 0 0;
  padding:0;
  list-style:none;
  display:grid;
  gap:1px;
  background:var(--line-600);
  border-top:1px solid var(--line-600);
}

.page-about .ab-next__links li{
  display:flex;
  flex-direction:column;
  gap:4px;
  padding:16px 0;
  border-bottom:1px solid var(--line-600);
  background:transparent;
}

.page-about .ab-next__links a{
  font-family:var(--font-display);
  font-size:16px;
  font-weight:800;
  letter-spacing:.02em;
  color:var(--cyan-400);
  text-decoration:none;
}

.page-about .ab-next__links a:hover,
.page-about .ab-next__links a:focus-visible{
  color:var(--amber-500);
}

.page-about .ab-next__links span{
  font-size:13.5px;
  line-height:1.6;
  color:var(--mist-300);
}

/* ---------- 平板 ---------- */
@media (min-width:760px){
  .page-about .ab-stats{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }

  .page-about .ab-stats__num{
    font-size:30px;
  }

  .page-about .ab-flow__list{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }

  .page-about .ab-rules__list{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:30px 32px;
  }

  .page-about .ab-next__panel{
    padding:38px 34px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width:900px){
  .page-about .ab-hero{
    padding:30px 0 60px;
  }

  .page-about .ab-hero__inner{
    grid-template-columns:minmax(0,1.18fr) minmax(0,.82fr);
    gap:48px;
    align-items:start;
  }

  .page-about .ab-hero__intro{
    font-size:17px;
  }

  .page-about .ab-hero__figure{
    aspect-ratio:3 / 4;
  }

  .page-about .ab-hero__figure img{
    height:100%;
    max-height:none;
  }

  .page-about .ab-timeline,
  .page-about .ab-team-section,
  .page-about .ab-flow,
  .page-about .ab-rules{
    padding:88px 0;
  }

  .page-about .ab-tl{
    margin-top:34px;
  }

  .page-about .ab-tl__item{
    display:grid;
    grid-template-columns:var(--ab-axis-w) minmax(0,1fr);
    column-gap:40px;
    padding:0 0 46px;
  }

  .page-about .ab-tl__item::before{
    left:4px;
    top:26px;
    bottom:6px;
  }

  .page-about .ab-tl__item::after{
    left:0;
    top:8px;
  }

  .page-about .ab-tl__year{
    font-size:16px;
    letter-spacing:.2em;
  }

  .page-about .ab-tl__title{
    font-size:21px;
  }

  .page-about .ab-tl__item:nth-child(odd) .ab-tl__body{
    max-width:36em;
  }

  .page-about .ab-tl__item:nth-child(even) .ab-tl__body{
    max-width:46em;
  }

  .page-about .ab-team{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    column-gap:56px;
  }

  .page-about .ab-team__row{
    grid-template-columns:68px minmax(0,1fr);
    padding:22px 0;
  }

  .page-about .ab-team__num{
    font-size:32px;
  }

  .page-about .ab-rules__list{
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:36px;
  }

  .page-about .ab-next{
    padding-bottom:88px;
  }

  .page-about .ab-next__panel{
    display:grid;
    grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr);
    gap:44px;
    align-items:start;
    padding:46px 44px;
    clip-path:polygon(0 0,100% 0,100% 100%,26px 100%,0 calc(100% - 26px));
  }

  .page-about .ab-next__links{
    margin-top:14px;
    border-top:1px solid var(--line-600);
  }
}

@media (min-width:1080px){
  .page-about .ab-flow__list{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }
}