.page-about{
  --about-line:rgba(127,212,255,.18);
  --about-line-soft:rgba(127,212,255,.30);
  --about-panel:rgba(16,26,56,.72);
  position:relative;
  color:var(--frost);
  background-color:var(--void);
  background-image:
    radial-gradient(1100px 560px at 85% -8%, rgba(53,224,208,.10), transparent 62%),
    radial-gradient(820px 500px at 0% 12%, rgba(255,77,157,.07), transparent 64%),
    linear-gradient(180deg,#070B1A 0%,#0A1128 42%,#070B1A 100%);
  background-repeat:no-repeat;
  overflow-x:hidden;
}

.page-about .breadcrumb{
  padding-top:22px;
  font-size:13px;
  letter-spacing:.02em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  padding:28px 0 8px;
}
.page-about .about-hero__grid{
  display:grid;
  gap:30px;
}
.page-about .about-hero__eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--ice);
}
.page-about .about-hero__eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:var(--ice);
  flex:none;
}
.page-about .about-hero h1{
  margin:0 0 16px;
  font-family:var(--font-head);
  font-weight:800;
  font-size:clamp(27px,6vw,50px);
  line-height:1.18;
  letter-spacing:.02em;
  color:var(--frost);
}
.page-about .about-hero__lead{
  margin:0 0 24px;
  max-width:54ch;
  font-size:16px;
  line-height:1.85;
  color:rgba(244,247,255,.82);
}
.page-about .about-hero__actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-bottom:28px;
}
.page-about .about-hero__stats{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(120px,1fr));
  gap:14px 20px;
  margin:0;
  padding-top:18px;
  border-top:1px solid var(--line);
}
.page-about .about-hero__stat{
  margin:0;
}
.page-about .about-hero__stat dt{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--stone);
  margin-bottom:6px;
}
.page-about .about-hero__stat dd{
  margin:0;
  font-family:var(--font-head);
  font-weight:700;
  font-size:28px;
  line-height:1;
  color:var(--crystal);
}
.page-about .about-hero__stat dd span{
  margin-left:4px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:400;
  color:var(--stone);
}

.page-about .about-hero__visual{
  position:relative;
  margin:0;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--r-2);
  background:rgba(16,26,56,.55);
  box-shadow:0 0 0 1px rgba(127,212,255,.06), 0 20px 60px -34px rgba(53,224,208,.55);
}
.page-about .about-hero__visual::after{
  content:"";
  position:absolute;
  inset:10px;
  border:1px dashed rgba(127,212,255,.18);
  border-radius:calc(var(--r-2) - 2px);
  pointer-events:none;
}
.page-about .about-hero__visual img,
.page-about .about-figure img{
  display:block;
  width:100%;
  height:auto;
  max-width:100%;
  object-fit:cover;
}
.page-about .img-frame__caption{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  line-height:1.6;
  color:var(--stone);
  padding:10px 14px;
}

/* ---------- 轨道骨架 ---------- */
.page-about .about-rail{
  position:relative;
  padding-top:10px;
  padding-bottom:40px;
}
.page-about .about-rail > .container{
  position:relative;
}
.page-about .about-block{
  position:relative;
  padding:34px 0;
}

/* ---------- 章节头 ---------- */
.page-about .about-block__head{
  display:grid;
  gap:12px;
  margin-bottom:22px;
}
.page-about .about-block__index{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(30px,7vw,48px);
  line-height:.95;
  letter-spacing:.06em;
  color:rgba(127,212,255,.30);
}
.page-about .about-block__title{
  margin:0 0 10px;
  font-family:var(--font-head);
  font-weight:700;
  font-size:clamp(20px,4vw,30px);
  line-height:1.32;
  letter-spacing:.01em;
  color:var(--frost);
}
.page-about .about-block__lead{
  margin:0;
  max-width:64ch;
  font-size:15.5px;
  line-height:1.85;
  color:rgba(244,247,255,.76);
}

.page-about .about-copy{
  margin:0 0 16px;
  max-width:64ch;
  font-size:16px;
  line-height:1.85;
  color:rgba(244,247,255,.84);
}
.page-about .about-copy--note{
  margin-top:20px;
  padding-left:14px;
  border-left:2px solid var(--about-line-soft);
  font-size:14.5px;
  line-height:1.85;
  color:var(--stone);
}

/* ---------- 资料卡 ---------- */
.page-about .about-cards{
  display:grid;
  gap:14px;
}
.page-about .about-card{
  position:relative;
  padding:20px 18px;
  border:1px solid var(--line);
  border-radius:var(--r-2);
  background:var(--about-panel);
  overflow:hidden;
}
.page-about .about-card::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:20px;
  height:20px;
  background:linear-gradient(135deg,rgba(127,212,255,.34),transparent 72%);
  border-top-left-radius:var(--r-2);
}
.page-about .about-card .tag{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
}
.page-about .about-card__title{
  margin:12px 0 8px;
  font-family:var(--font-head);
  font-size:17px;
  font-weight:700;
  line-height:1.45;
  color:var(--frost);
}
.page-about .about-card__text{
  margin:0;
  font-size:14.5px;
  line-height:1.8;
  color:rgba(244,247,255,.78);
}

/* ---------- 订阅权益分栏 ---------- */
.page-about .about-split{
  display:grid;
  gap:24px;
}
.page-about .about-split__main{
  min-width:0;
}
.page-about .about-formats{
  display:grid;
  gap:12px;
  margin:6px 0 0;
}
.page-about .about-format{
  padding:16px 18px;
  border:1px solid var(--line);
  border-radius:var(--r-2);
  background:linear-gradient(150deg,rgba(201,230,255,.07),rgba(16,26,56,.62) 62%);
}
.page-about .about-format__label{
  margin:0 0 8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--gold);
}
.page-about .about-format p{
  margin:0;
  font-size:14px;
  line-height:1.78;
  color:rgba(244,247,255,.80);
}
.page-about .about-usecases{
  list-style:none;
  margin:20px 0 0;
  padding:0;
  display:grid;
  gap:9px;
}
.page-about .about-usecases li{
  position:relative;
  padding-left:20px;
  font-size:14.5px;
  line-height:1.8;
  color:rgba(244,247,255,.78);
}
.page-about .about-usecases li::before{
  content:"";
  position:absolute;
  left:2px;
  top:.68em;
  width:7px;
  height:7px;
  border:1px solid var(--cyan);
  transform:rotate(45deg);
}
.page-about .about-inline-link{
  margin:20px 0 0;
}
.page-about .about-link{
  color:var(--ice);
  text-decoration:none;
  border-bottom:1px solid rgba(127,212,255,.45);
  transition:color 160ms var(--ease), border-color 160ms var(--ease);
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible{
  color:var(--cyan);
  border-bottom-color:var(--cyan);
}

.page-about .about-figure{
  margin:0;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--r-2);
  background:rgba(16,26,56,.5);
}
.page-about .about-figure--timeline{
  margin-top:26px;
}

/* ---------- 表格 ---------- */
.page-about .about-table-wrap{
  margin-top:4px;
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:var(--r-2);
  background:var(--about-panel);
}
.page-about .about-table{
  width:100%;
  min-width:520px;
  border-collapse:collapse;
  font-size:14px;
}
.page-about .about-table__caption{
  caption-side:top;
  text-align:left;
  padding:14px 16px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--stone);
}
.page-about .about-table th,
.page-about .about-table td{
  padding:12px 16px;
  text-align:left;
  vertical-align:top;
  line-height:1.7;
  border-bottom:1px solid rgba(30,42,68,.9);
}
.page-about .about-table thead th{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--ice);
  background:rgba(16,26,56,.85);
}
.page-about .about-table tbody th{
  font-weight:600;
  white-space:nowrap;
  color:var(--frost);
}
.page-about .about-table tbody td{
  color:rgba(244,247,255,.78);
}
.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td{
  border-bottom:0;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline{
  list-style:none;
  margin:0;
  padding:0;
  position:relative;
}
.page-about .about-timeline::before{
  content:"";
  position:absolute;
  left:7px;
  top:10px;
  bottom:10px;
  width:1px;
  background:linear-gradient(180deg,var(--about-line-soft),rgba(53,224,208,.34),var(--about-line));
}
.page-about .about-timeline__item{
  position:relative;
  padding:0 0 12px 30px;
}
.page-about .about-timeline__item::before{
  content:"";
  position:absolute;
  left:0;
  top:16px;
  width:15px;
  height:15px;
  border-radius:50%;
  background:var(--void);
  border:1px solid var(--cyan);
  box-shadow:0 0 0 4px rgba(53,224,208,.10);
}
.page-about .about-node{
  border:1px solid var(--line);
  border-radius:var(--r-2);
  background:var(--about-panel);
  overflow:hidden;
}
.page-about .about-node__summary{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:8px 12px;
  padding:14px 16px;
  cursor:pointer;
  list-style:none;
}
.page-about .about-node__summary::-webkit-details-marker{
  display:none;
}
.page-about .about-node__summary::after{
  content:"+";
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:16px;
  color:var(--ice);
}
.page-about .about-node[open] .about-node__summary::after{
  content:"–";
  color:var(--cyan);
}
.page-about .about-node[open] .about-node__summary{
  border-bottom:1px solid rgba(30,42,68,.9);
}
.page-about .about-node__ver{
  flex:none;
  padding:3px 9px;
  border:1px solid rgba(255,196,107,.5);
  border-radius:var(--r-1);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--gold);
}
.page-about .about-node__title{
  font-size:15px;
  font-weight:600;
  line-height:1.6;
  color:var(--frost);
}
.page-about .about-node__body{
  margin:0;
  padding:14px 16px 4px;
  font-size:14.5px;
  line-height:1.82;
  color:rgba(244,247,255,.78);
}
.page-about .about-node__meta{
  margin:0;
  padding:8px 16px 14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--stone);
}

/* ---------- 团队与节奏 ---------- */
.page-about .about-team{
  display:grid;
  gap:12px;
  margin-bottom:22px;
}
.page-about .about-team__item{
  padding:16px 18px;
  border:1px solid var(--line);
  border-radius:var(--r-2);
  background:linear-gradient(160deg,rgba(201,230,255,.06),rgba(16,26,56,.6) 70%);
}
.page-about .about-team__item h3{
  margin:0 0 8px;
  font-family:var(--font-head);
  font-size:16px;
  font-weight:700;
  color:var(--crystal);
}
.page-about .about-team__item p{
  margin:0;
  font-size:14px;
  line-height:1.78;
  color:rgba(244,247,255,.78);
}
.page-about .about-push{
  margin-top:22px;
  padding:18px;
  border:1px solid var(--line);
  border-radius:var(--r-2);
  background:rgba(16,26,56,.5);
}
.page-about .about-push__label{
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--magenta);
}
.page-about .about-push__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:10px;
}
.page-about .about-push__list li{
  font-size:14.5px;
  line-height:1.75;
  color:rgba(244,247,255,.78);
  padding-left:14px;
  position:relative;
}
.page-about .about-push__list li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--ice);
}
.page-about .about-push__list strong{
  margin-right:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--ice);
}
.page-about .about-push__note{
  margin:14px 0 0;
  font-size:14px;
  line-height:1.8;
  color:var(--stone);
}

/* ---------- 订阅纸张叠层 ---------- */
.page-about .about-subscribe{
  padding-bottom:56px;
}
.page-about .about-paper{
  position:relative;
  padding:22px 18px;
  border:1px solid var(--line);
  border-radius:var(--r-2);
  background:linear-gradient(165deg,rgba(201,230,255,.08),rgba(16,26,56,.92) 58%);
  box-shadow:
    7px 7px 0 -1px rgba(16,26,56,.85),
    7px 7px 0 0 rgba(30,42,68,.9),
    14px 14px 0 -1px rgba(16,26,56,.6),
    14px 14px 0 0 rgba(30,42,68,.7);
}
.page-about .about-steps{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
}
.page-about .about-step{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:14px;
  padding:14px 0;
  border-bottom:1px dashed rgba(30,42,68,.95);
}
.page-about .about-step:last-child{
  border-bottom:0;
  padding-bottom:4px;
}
.page-about .about-step__num{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  border:1px solid var(--about-line-soft);
  border-radius:50%;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--cyan);
}
.page-about .about-step__body h3{
  margin:2px 0 6px;
  font-family:var(--font-head);
  font-size:16px;
  font-weight:700;
  color:var(--frost);
}
.page-about .about-step__body p{
  margin:0;
  font-size:14.5px;
  line-height:1.8;
  color:rgba(244,247,255,.78);
}
.page-about .about-subscribe__foot{
  margin:18px 0 0;
  padding-top:16px;
  border-top:1px solid rgba(30,42,68,.95);
  font-size:14px;
  line-height:1.85;
  color:var(--stone);
}

/* ---------- 窄屏保护 ---------- */
@media (max-width:400px){
  .page-about .about-paper{
    box-shadow:
      5px 5px 0 -1px rgba(16,26,56,.85),
      5px 5px 0 0 rgba(30,42,68,.9);
  }
  .page-about .about-node__title{
    font-size:14.5px;
  }
}

/* ---------- 平板 ---------- */
@media (min-width:700px){
  .page-about .about-cards{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
  .page-about .about-formats{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
  .page-about .about-team{
    grid-template-columns:repeat(2,minmax(0,1fr));
  }
  .page-about .about-block{
    padding:42px 0;
  }
}

/* ---------- 桌面：侧边轨道与分栏 ---------- */
@media (min-width:980px){
  .page-about .about-hero{
    padding:52px 0 22px;
  }
  .page-about .about-hero__grid{
    grid-template-columns:minmax(0,7fr) minmax(0,5fr);
    gap:52px;
    align-items:center;
  }
  .page-about .about-block{
    padding-left:78px;
    padding-top:48px;
    padding-bottom:48px;
  }
  .page-about .about-block::before{
    content:"";
    position:absolute;
    left:34px;
    top:0;
    bottom:0;
    width:1px;
    background:var(--about-line);
  }
  .page-about .about-block::after{
    content:"";
    position:absolute;
    left:29px;
    top:66px;
    width:11px;
    height:11px;
    border-radius:50%;
    background:var(--void);
    border:1px solid var(--ice);
    box-shadow:0 0 0 5px rgba(127,212,255,.08);
  }
  .page-about .about-rail > .container > .about-block:last-child::before{
    background:linear-gradient(180deg,var(--about-line),transparent);
  }
  .page-about .about-block__head{
    grid-template-columns:auto minmax(0,1fr);
    column-gap:22px;
    align-items:start;
    margin-bottom:26px;
  }
  .page-about .about-cards{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
  .page-about .about-split{
    grid-template-columns:minmax(0,8fr) minmax(0,4fr);
    gap:34px;
    align-items:start;
  }
  .page-about .about-team{
    grid-template-columns:repeat(3,minmax(0,1fr));
  }
  .page-about .about-paper{
    padding:30px 32px;
  }
  .page-about .about-steps{
    grid-template-columns:repeat(2,minmax(0,1fr));
    column-gap:34px;
  }
  .page-about .about-step:nth-last-child(2){
    border-bottom:0;
  }
  .page-about .about-step:nth-child(odd){
    border-right:1px dashed rgba(30,42,68,.95);
    padding-right:34px;
  }
  .page-about .about-node__summary{
    padding:16px 20px;
  }
  .page-about .about-node__body{
    padding:16px 20px 4px;
  }
  .page-about .about-node__meta{
    padding:8px 20px 16px;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-link{
    transition:none;
  }
  .page-about .about-timeline__item::before{
    box-shadow:none;
  }
}