.page-about{
  --ab-r:24px;
  --ab-rail:200px;
  display:block;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero{
  padding:28px 0 52px;
  background:
    radial-gradient(115% 78% at 90% -4%, rgba(79,227,208,.11) 0%, rgba(79,227,208,0) 56%),
    radial-gradient(88% 66% at 2% 10%, rgba(255,122,26,.08) 0%, rgba(255,122,26,0) 62%);
}

.page-about .breadcrumb{
  margin:0 0 22px;
}

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

.page-about .about-hero-copy h1{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(30px, 8.2vw, 54px);
  line-height:1.12;
  letter-spacing:-.03em;
  color:var(--text);
  margin:12px 0 16px;
}

.page-about .about-lede{
  font-size:16px;
  line-height:1.78;
  color:var(--text-soft);
  max-width:58ch;
  margin:0 0 24px;
}

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

.page-about .about-hero-media{
  margin:0;
  border-radius:var(--ab-r);
  border:1px solid var(--line);
  background:var(--panel);
  overflow:hidden;
}

.page-about .about-hero-media img{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:14 / 9;
  object-fit:cover;
}

.page-about .about-hero-media .media-caption{
  padding:11px 16px 15px;
  margin:0;
}

.page-about .about-keyfigures{
  list-style:none;
  margin:34px 0 0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2, minmax(0, 1fr));
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  border-radius:20px;
  overflow:hidden;
}

.page-about .about-keyfigures li{
  background:var(--panel);
  padding:16px 18px;
  display:flex;
  flex-direction:column;
  gap:6px;
  min-width:0;
}

.page-about .about-keyfigures .num{
  font-size:clamp(24px, 6vw, 32px);
  font-weight:700;
  line-height:1;
  color:var(--cyan);
  letter-spacing:-.02em;
}

.page-about .about-kf-label{
  font-size:12px;
  letter-spacing:.08em;
  color:var(--muted);
  line-height:1.5;
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body{
  padding-bottom:80px;
}

.page-about .about-layout{
  display:grid;
  gap:30px;
}

.page-about .about-rail{
  min-width:0;
}

.page-about .about-rail-label{
  margin:0 0 12px;
  font-size:12px;
  letter-spacing:.16em;
  color:var(--muted);
}

.page-about .about-toc ol{
  list-style:none;
  margin:0;
  padding:0 0 6px;
  display:flex;
  gap:8px;
  overflow-x:auto;
  overscroll-behavior-x:contain;
  scrollbar-width:none;
}

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

.page-about .about-toc a{
  display:inline-block;
  white-space:nowrap;
  padding:7px 14px;
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  background:var(--panel);
  color:var(--muted);
  font-size:13px;
  line-height:1.4;
  text-decoration:none;
  transition:color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-toc a:hover{
  color:var(--text-soft);
  border-color:var(--line-strong);
}

.page-about .about-toc a[aria-current="location"]{
  color:var(--ink);
  background:var(--cyan);
  border-color:var(--cyan);
}

.page-about .about-flow{
  display:flex;
  flex-direction:column;
  gap:56px;
  min-width:0;
}

.page-about .about-section{
  scroll-margin-top:calc(var(--header-h) + 26px);
  min-width:0;
}

.page-about .about-section--last{
  padding-bottom:8px;
}

.page-about .about-sechead{
  display:flex;
  align-items:baseline;
  gap:14px;
  padding-bottom:14px;
  margin-bottom:20px;
  border-bottom:1px solid var(--line);
}

.page-about .about-secnum{
  flex:none;
  font-size:13px;
  letter-spacing:.12em;
  color:var(--cyan);
}

.page-about .about-sechead h2{
  margin:0;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(21px, 5vw, 30px);
  line-height:1.26;
  letter-spacing:-.02em;
  color:var(--text);
}

.page-about .about-note{
  margin:18px 0 0;
  padding:13px 16px;
  border-left:2px solid var(--orange);
  border-radius:0 14px 14px 0;
  background:rgba(255,122,26,.07);
  color:var(--text-soft);
  font-size:14px;
  line-height:1.72;
}

/* ---------- 三个小组 ---------- */

.page-about .crew-grid{
  list-style:none;
  margin:26px 0 0;
  padding:0;
  display:grid;
  gap:16px;
}

.page-about .crew-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--ab-r);
  padding:22px;
  min-width:0;
  transition:transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .crew-card:hover{
  transform:translateY(-2px);
  border-color:var(--line-strong);
}

.page-about .crew-pill{
  display:inline-block;
  padding:4px 12px;
  margin-bottom:12px;
  border:1px solid currentColor;
  border-radius:var(--r-pill);
  background:transparent;
  font-size:12px;
  letter-spacing:.1em;
  line-height:1.5;
}

.page-about .crew-pill--schedule{ color:var(--cyan); }
.page-about .crew-pill--data{ color:var(--orange-soft); }
.page-about .crew-pill--feature{ color:var(--text-soft); }

.page-about .crew-card h3{
  margin:0 0 8px;
  font-size:18px;
  font-weight:700;
  line-height:1.42;
  color:var(--text);
}

.page-about .crew-card > p{
  margin:0;
  font-size:14.5px;
  line-height:1.72;
  color:var(--muted);
}

.page-about .crew-details{
  margin-top:14px;
  padding-top:12px;
  border-top:1px dashed var(--line);
}

.page-about .crew-details summary{
  display:flex;
  align-items:center;
  gap:8px;
  cursor:pointer;
  list-style:none;
  font-size:13px;
  letter-spacing:.04em;
  color:var(--cyan);
}

.page-about .crew-details summary::-webkit-details-marker{ display:none; }

.page-about .crew-details summary::after{
  content:"+";
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:15px;
  line-height:1;
  transition:transform .2s var(--ease);
}

.page-about .crew-details[open] summary::after{
  transform:rotate(45deg);
}

.page-about .crew-details ul{
  list-style:none;
  margin:12px 0 0;
  padding:0;
  display:grid;
  gap:8px;
}

.page-about .crew-details li{
  position:relative;
  padding-left:16px;
  font-size:13.5px;
  line-height:1.68;
  color:var(--muted);
}

.page-about .crew-details li::before{
  content:"";
  position:absolute;
  left:0;
  top:.62em;
  width:6px;
  height:6px;
  border-radius:var(--r-pill);
  background:var(--line-strong);
}

.page-about .handoff-list{
  list-style:none;
  margin:26px 0 0;
  padding:0 0 0 20px;
  border-left:2px solid var(--line);
  display:grid;
}

.page-about .handoff-list li{
  padding:13px 0;
  border-bottom:1px solid rgba(36,51,73,.62);
  font-size:14.5px;
  line-height:1.68;
  color:var(--text-soft);
}

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

.page-about .handoff-list li:first-child{
  padding-top:2px;
}

.page-about .handoff-list .num{
  margin-right:10px;
  font-size:12px;
  letter-spacing:.12em;
  color:var(--cyan);
}

/* ---------- 值班表 ---------- */

.page-about .shift-track{
  list-style:none;
  margin:26px 0 0;
  padding:0;
  display:grid;
  gap:12px;
}

.page-about .shift-item{
  display:grid;
  gap:8px;
  padding:18px;
  border:1px solid var(--line);
  border-radius:20px;
  background:var(--panel);
  min-width:0;
  transition:border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .shift-item:hover{
  border-color:var(--line-strong);
}

.page-about .shift-time{
  font-size:15px;
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--cyan);
}

.page-about .shift-body h3{
  margin:0 0 5px;
  font-size:16px;
  font-weight:700;
  line-height:1.45;
  color:var(--text);
}

.page-about .shift-body p{
  margin:0;
  font-size:14px;
  line-height:1.72;
  color:var(--muted);
}

/* ---------- 比分对齐 ---------- */

.page-about .about-figure{
  margin:26px 0 0;
  border:1px solid var(--line);
  border-radius:var(--ab-r);
  background:var(--panel);
  overflow:hidden;
}

.page-about .about-figure img{
  display:block;
  width:100%;
  height:auto;
  aspect-ratio:4 / 3;
  object-fit:cover;
}

.page-about .about-figure--wide img{
  aspect-ratio:16 / 9;
}

.page-about .about-figure .media-caption{
  padding:11px 16px 15px;
  margin:0;
}

.page-about .about-checkgrid{
  margin-top:16px;
}

.page-about .about-checkcard{
  min-width:0;
}

.page-about .about-checkcard .eyebrow{
  color:var(--orange-soft);
}

.page-about .about-checkcard h3{
  margin:10px 0 8px;
  font-size:17px;
  font-weight:700;
  line-height:1.42;
  color:var(--text);
}

.page-about .about-checkcard p{
  margin:0;
  font-size:14px;
  line-height:1.72;
  color:var(--muted);
}

/* ---------- 专题工序 ---------- */

.page-about .feature-steps{
  list-style:none;
  margin:26px 0 0;
  padding:0;
  display:grid;
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
  border-radius:var(--ab-r);
  overflow:hidden;
}

.page-about .feature-steps li{
  background:var(--bg);
  padding:18px 20px;
  min-width:0;
}

.page-about .step-idx{
  display:block;
  margin-bottom:7px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--orange);
}

.page-about .feature-steps h3{
  margin:0 0 6px;
  font-size:16.5px;
  font-weight:700;
  line-height:1.42;
  color:var(--text);
}

.page-about .feature-steps p{
  margin:0;
  font-size:14px;
  line-height:1.72;
  color:var(--muted);
}

/* ---------- 发展历程 ---------- */

.page-about .era-track{
  list-style:none;
  margin:26px 0 0;
  padding:0 0 10px;
  display:grid;
  grid-auto-flow:column;
  grid-auto-columns:minmax(232px, 76%);
  gap:14px;
  overflow-x:auto;
  overscroll-behavior-x:contain;
  scroll-snap-type:x mandatory;
  scrollbar-width:thin;
}

.page-about .era-card{
  position:relative;
  scroll-snap-align:start;
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:24px 22px 22px;
  border:1px solid var(--line);
  border-radius:22px;
  background:var(--panel);
  min-width:0;
  transition:border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .era-card::after{
  content:"";
  position:absolute;
  left:22px;
  right:22px;
  top:0;
  height:2px;
  border-radius:0 0 2px 2px;
  background:var(--line-strong);
}

.page-about .era-card:hover{
  transform:translateY(-2px);
  border-color:var(--line-strong);
}

.page-about .era-card--now{
  border-color:rgba(79,227,208,.4);
  background:linear-gradient(180deg, rgba(79,227,208,.1) 0%, rgba(23,35,52,1) 64%);
}

.page-about .era-card--now::after{
  background:var(--cyan);
}

.page-about .era-year{
  font-size:26px;
  font-weight:700;
  letter-spacing:-.02em;
  line-height:1;
  color:var(--muted);
}

.page-about .era-card--now .era-year{
  color:var(--cyan);
}

.page-about .era-card h3{
  margin:0;
  font-size:17px;
  font-weight:700;
  line-height:1.42;
  color:var(--text);
}

.page-about .era-card p{
  margin:0;
  font-size:14px;
  line-height:1.72;
  color:var(--muted);
}

/* ---------- 合作入口 ---------- */

.page-about .about-way-grid{
  margin-top:26px;
}

.page-about .about-way{
  min-width:0;
}

.page-about .about-way h3{
  margin:0 0 8px;
  font-size:16.5px;
  font-weight:700;
  line-height:1.42;
  color:var(--text);
}

.page-about .about-way p{
  margin:0;
  font-size:14px;
  line-height:1.72;
  color:var(--muted);
}

.page-about .about-join-cta{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:26px;
}

/* ---------- 640px 以上 ---------- */

@media (min-width:640px){

  .page-about .about-hero{
    padding:40px 0 60px;
  }

  .page-about .about-keyfigures{
    grid-template-columns:repeat(4, minmax(0, 1fr));
  }

  .page-about .shift-item{
    grid-template-columns:104px minmax(0, 1fr);
    align-items:baseline;
    gap:20px;
    padding:20px 22px;
  }

  .page-about .shift-time{
    font-size:16px;
  }

  .page-about .about-hero-media .media-caption,
  .page-about .about-figure .media-caption{
    padding:12px 20px 16px;
  }
}

/* ---------- 900px 以上 ---------- */

@media (min-width:900px){

  .page-about .about-hero{
    padding:48px 0 72px;
  }

  .page-about .about-hero-grid{
    grid-template-columns:minmax(0, 1.06fr) minmax(0, .94fr);
    align-items:center;
    gap:48px;
  }

  .page-about .about-hero-copy h1{
    margin-top:14px;
  }

  .page-about .about-layout{
    grid-template-columns:var(--ab-rail) minmax(0, 1fr);
    align-items:start;
    gap:56px;
  }

  .page-about .about-rail{
    position:sticky;
    top:calc(var(--header-h) + 30px);
  }

  .page-about .about-toc ol{
    display:block;
    padding:0;
    overflow:visible;
    position:relative;
  }

  .page-about .about-toc ol::before{
    content:"";
    position:absolute;
    left:5px;
    top:8px;
    bottom:8px;
    width:2px;
    border-radius:2px;
    background:var(--line);
  }

  .page-about .about-toc a{
    display:flex;
    align-items:center;
    gap:14px;
    padding:11px 0;
    border:0;
    border-radius:0;
    background:transparent;
    font-size:14px;
    color:var(--muted);
  }

  .page-about .about-toc a::before{
    content:"";
    flex:none;
    width:12px;
    height:12px;
    border-radius:var(--r-pill);
    background:var(--bg);
    border:2px solid var(--line-strong);
    position:relative;
    z-index:1;
    transition:background .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
  }

  .page-about .about-toc a:hover{
    background:transparent;
    border-color:transparent;
    color:var(--text-soft);
  }

  .page-about .about-toc a[aria-current="location"]{
    background:transparent;
    border-color:transparent;
    color:var(--cyan);
  }

  .page-about .about-toc a[aria-current="location"]::before{
    background:var(--cyan);
    border-color:var(--cyan);
    box-shadow:0 0 0 4px rgba(79,227,208,.15);
  }

  .page-about .crew-grid{
    grid-template-columns:repeat(3, minmax(0, 1fr));
    gap:18px;
  }

  .page-about .about-flow{
    gap:72px;
  }

  .page-about .era-track{
    grid-auto-columns:minmax(0, 1fr);
    overflow-x:visible;
    padding-bottom:0;
  }

  .page-about .about-section--last{
    padding-bottom:24px;
  }
}