.page-about{
  --ab-grid-line:rgba(57,255,136,.06);
  --ab-muted-line:rgba(245,240,230,.09);
  --ab-data-glow:rgba(57,255,136,.14);
  --ab-track:rgba(57,255,136,.28);
  --ab-card-bg:var(--bg-2);
  position:relative;
}
.page-about .visually-hidden{
  position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;
}

/* ========== 首屏 HERO ========== */
.page-about .ab-hero{
  position:relative;
  overflow:hidden;
  padding:44px 0 40px;
  background:
    linear-gradient(var(--ab-grid-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--ab-grid-line) 1px,transparent 1px),
    radial-gradient(ellipse at 80% 20%,rgba(57,255,136,.1),transparent 55%),
    var(--bg-3);
  background-size:48px 48px,48px 48px,auto,auto;
}
.page-about .ab-hero__inner{
  position:relative;
  z-index:2;
}
.page-about .ab-breadcrumb{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:.78rem;
  font-family:var(--font-mono);
  color:var(--muted);
  margin-bottom:30px;
}
.page-about .ab-breadcrumb a{
  color:var(--muted);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s,border-color .2s;
}
.page-about .ab-breadcrumb a:hover{
  color:var(--accent);
  border-color:var(--line-green);
}
.page-about .ab-breadcrumb__sep{
  color:var(--clay);
}
.page-about .ab-hero__grid{
  display:grid;
  gap:32px;
}
.page-about .ab-hero__kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:16px;
}
.page-about .ab-hero__kicker::before{
  content:'';
  width:28px;
  height:2px;
  background:var(--accent);
}
.page-about .ab-hero__title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.9rem,5.2vw,3.4rem);
  line-height:1.12;
  letter-spacing:.01em;
  margin:0 0 8px;
  color:var(--ink);
}
.page-about .ab-hero__title-dot{
  color:var(--clay);
}
.page-about .ab-hero__title-zh{
  color:var(--accent);
}
.page-about .ab-hero__sub{
  font-family:var(--font-mono);
  font-size:clamp(.92rem,1.6vw,1.2rem);
  color:var(--accent-2);
  letter-spacing:.06em;
  margin:0 0 18px;
}
.page-about .ab-hero__lead{
  max-width:44em;
  color:var(--ink);
  opacity:.86;
  line-height:1.8;
  margin:0;
}
.page-about .ab-hero__aside{
  display:flex;
  flex-direction:column;
  gap:12px;
  border-left:2px solid var(--line-green);
  padding-left:20px;
}
.page-about .ab-hero__stat{
  position:relative;
  display:grid;
  gap:2px;
  padding:14px 16px;
  background:var(--bg-2);
  clip-path:var(--bevel);
}
.page-about .ab-hero__stat::before{
  content:'';
  position:absolute;
  left:0;
  top:8px;
  bottom:8px;
  width:3px;
  background:var(--accent);
}
.page-about .data-num{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:1.6rem;
  line-height:1.2;
  letter-spacing:.02em;
  color:var(--accent);
}
.page-about .data-label{
  font-size:.76rem;
  letter-spacing:.08em;
  color:var(--muted);
}
.page-about .ab-hero__diag{
  display:none;
}

/* ========== 页面目录 ========== */
.page-about .ab-pagenav{
  border-bottom:1px solid var(--line);
  background:rgba(6,13,28,.98);
}
.page-about .ab-pagenav__inner{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding-top:14px;
  padding-bottom:14px;
}
.page-about .ab-pagenav__link{
  font-family:var(--font-mono);
  font-size:.74rem;
  color:var(--muted);
  text-decoration:none;
  padding:6px 12px;
  background:var(--bg-2);
  border:1px solid var(--line);
  clip-path:polygon(9px 0,100% 0,calc(100% - 9px) 100%,0 100%);
  transition:color .2s,background .2s,border-color .2s;
}
.page-about .ab-pagenav__link:hover{
  color:var(--bg);
  background:var(--accent);
  border-color:var(--accent);
}
.page-about .ab-pagenav__link.is-active{
  color:var(--bg);
  background:var(--accent);
  border-color:var(--accent);
}

/* ========== 01 品牌起源 ========== */
.page-about .ab-origin{
  padding:64px 0 48px;
}
.page-about .ab-origin__grid{
  display:grid;
  gap:32px;
  grid-template-columns:1fr;
}
.page-about .sec-label{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.14em;
  color:var(--clay);
  border-left:3px solid var(--accent);
  padding-left:10px;
  margin-bottom:16px;
}
.page-about .ab-origin__text h2,
.page-about .ab-sec-h h2,
.page-about .ab-team__text h2{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.5rem,3vw,2.3rem);
  line-height:1.25;
  margin:0 0 18px;
  color:var(--ink);
}
.page-about .ab-origin__text p,
.page-about .ab-team__text p,
.page-about .ab-tl-item__body p,
.page-about .ab-principle p,
.page-about .ab-honor p,
.page-about .ab-milestones__note,
.page-about .ab-philosophy__tips{
  color:var(--ink);
  opacity:.82;
  line-height:1.8;
}
.page-about .ab-origin__text p{
  margin-bottom:16px;
}
.page-about .ab-origin__figure{
  margin:28px 0 0;
}
.page-about .ab-origin__img{
  display:block;
  width:100%;
  max-width:100%;
  height:auto;
  object-fit:cover;
  border:1px solid var(--line);
  clip-path:var(--bevel);
}
.page-about .ab-origin__figure figcaption,
.page-about .ab-milestones__figure figcaption,
.page-about .ab-team__figure figcaption{
  font-family:var(--font-mono);
  font-size:.78rem;
  color:var(--muted);
  border-left:2px solid var(--clay);
  padding-left:12px;
  margin-top:10px;
}
.page-about .ab-origin__aside{
  display:flex;
  flex-direction:column;
  gap:16px;
}
.page-about .ab-origin__aside-card{
  display:grid;
  gap:8px;
  padding:20px;
  background:var(--bg-2);
  clip-path:var(--bevel);
  border-left:3px solid var(--clay);
}
.page-about .ab-origin__aside-card p{
  font-size:.88rem;
  line-height:1.7;
  color:var(--ink);
  opacity:.8;
  margin:0;
}
.page-about .ab-link{
  display:inline-flex;
  align-items:center;
  gap:5px;
  font-family:var(--font-mono);
  font-size:.84rem;
  font-weight:500;
  color:var(--accent);
  text-decoration:none;
  transition:color .2s,gap .2s;
}
.page-about .ab-link::after{
  content:'→';
  transition:transform .2s;
}
.page-about .ab-link:hover{
  color:var(--ink);
  gap:9px;
}

/* ========== 02 关键里程碑 ========== */
.page-about .ab-milestones{
  position:relative;
  overflow:hidden;
  padding:64px 0;
  background:var(--bg-3);
}
.page-about .ab-milestones::after{
  content:'';
  position:absolute;
  right:-80px;
  top:90px;
  width:240px;
  height:240px;
  background:repeating-linear-gradient(135deg,var(--ab-data-glow) 0 2px,transparent 2px 18px);
  opacity:.5;
  pointer-events:none;
}
.page-about .ab-sec-h{
  position:relative;
  z-index:1;
  margin-bottom:30px;
}
.page-about .ab-sec-h p{
  color:var(--ink);
  opacity:.75;
  line-height:1.7;
  max-width:38em;
  margin:0;
}
.page-about .ab-milestones__figure{
  margin:28px 0 36px;
}
.page-about .ab-milestones__figure img{
  display:block;
  width:100%;
  max-width:100%;
  height:auto;
  object-fit:cover;
  border:1px solid var(--line);
  clip-path:var(--bevel);
}

/* 时间轴 */
.page-about .ab-timeline{
  position:relative;
  margin:20px 0 28px;
  padding-left:40px;
}
.page-about .ab-timeline::before{
  content:'';
  position:absolute;
  left:12px;
  top:10px;
  bottom:10px;
  width:2px;
  background:repeating-linear-gradient(180deg,var(--ab-track) 0 6px,transparent 6px 12px);
}
.page-about .ab-tl-item{
  position:relative;
  margin-bottom:18px;
  background:var(--bg-2);
  border:1px solid var(--line);
  clip-path:var(--bevel);
  transition:border-color .2s,background .2s;
}
.page-about .ab-tl-item::before{
  content:'';
  position:absolute;
  left:-35px;
  top:22px;
  width:14px;
  height:14px;
  background:var(--bg);
  border:3px solid var(--accent);
  clip-path:polygon(4px 0,calc(100% - 4px) 0,100% 4px,100% calc(100% - 4px),calc(100% - 4px) 100%,4px 100%,0 calc(100% - 4px),0 4px);
}
.page-about .ab-tl-item:hover{
  border-color:var(--line-green);
}
.page-about .ab-tl-item[open]{
  border-color:var(--line-green);
  box-shadow:inset 0 0 0 1px var(--line-green);
}
.page-about .ab-tl-item__head{
  display:grid;
  grid-template-columns:1fr;
  gap:5px;
  padding:18px 20px;
  cursor:pointer;
  list-style:none;
  align-items:baseline;
}
.page-about .ab-tl-item__head::-webkit-details-marker{
  display:none;
}
.page-about .ab-tl-item__head::marker{
  content:'';
}
.page-about .ab-tl-item__head:hover{
  background:rgba(57,255,136,.05);
}
.page-about .ab-tl-item__year{
  font-family:var(--font-mono);
  font-size:.8rem;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--accent-2);
}
.page-about .ab-tl-item__title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:1.08rem;
  line-height:1.4;
  color:var(--ink);
}
.page-about .ab-tl-item__toggle{
  justify-self:start;
  font-family:var(--font-mono);
  font-size:.72rem;
  color:var(--muted);
  border:1px dashed var(--line);
  padding:2px 8px;
  margin-top:2px;
  transition:color .2s,border-color .2s;
}
.page-about .ab-tl-item__toggle-close{
  display:none;
}
.page-about .ab-tl-item[open] .ab-tl-item__toggle-open{
  display:none;
}
.page-about .ab-tl-item[open] .ab-tl-item__toggle-close{
  display:inline;
}
.page-about .ab-tl-item[open] .ab-tl-item__toggle{
  color:var(--accent);
  border-color:var(--line-green);
}
.page-about .ab-tl-item__body{
  padding:0 20px 18px;
  border-top:1px solid var(--line);
}
.page-about .ab-tl-item__body p{
  margin:14px 0 0;
}
.page-about .ab-tl-item__body a,
.page-about .ab-milestones__note a,
.page-about .ab-philosophy__tips a{
  color:var(--accent);
  text-decoration:none;
  border-bottom:1px solid var(--line-green);
}
.page-about .ab-tl-item__body a:hover,
.page-about .ab-milestones__note a:hover,
.page-about .ab-philosophy__tips a:hover{
  color:var(--ink);
}
.page-about .ab-milestones__note{
  font-size:.88rem;
  margin:0;
}

/* ========== 03 数据理念 ========== */
.page-about .ab-philosophy{
  padding:64px 0 48px;
}
.page-about .ab-principles{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
}
.page-about .ab-principle{
  position:relative;
  overflow:hidden;
  padding:24px 22px;
  background:var(--bg-2);
  clip-path:var(--bevel);
  border-bottom:3px solid var(--clay);
}
.page-about .ab-principle::after{
  content:'';
  position:absolute;
  top:0;
  right:0;
  width:46px;
  height:46px;
  background:linear-gradient(135deg,transparent 0 68%,var(--ab-data-glow) 69% 72%,transparent 73%);
}
.page-about .ab-principle__idx{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:.78rem;
  color:var(--clay);
  border:1px solid var(--line);
  padding:2px 10px;
  margin-bottom:12px;
}
.page-about .ab-principle h3{
  font-family:var(--font-display);
  font-weight:700;
  font-size:1.2rem;
  color:var(--ink);
  margin-bottom:8px;
}
.page-about .ab-principle p{
  font-size:.9rem;
  margin:0;
}
.page-about .ab-philosophy__tips{
  margin-top:22px;
  font-size:.88rem;
}

/* ========== 04 团队与文化 ========== */
.page-about .ab-team{
  padding:64px 0;
  background:var(--bg-3);
}
.page-about .ab-team__grid{
  display:grid;
  gap:32px;
  align-items:start;
}
.page-about .ab-team__text p{
  margin-bottom:16px;
}
.page-about .ab-team__figure{
  margin:0;
}
.page-about .ab-team__figure img{
  display:block;
  width:100%;
  max-width:100%;
  height:auto;
  object-fit:cover;
  border:1px solid var(--line);
  clip-path:var(--bevel);
}

/* ========== 05 资质与荣誉 ========== */
.page-about .ab-honors{
  padding:64px 0 52px;
}
.page-about .ab-honors__grid{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
  margin-top:24px;
}
.page-about .ab-honor{
  position:relative;
  padding:28px 24px;
  background:var(--bg-2);
  clip-path:var(--bevel);
  border-top:3px solid var(--accent);
}
.page-about .ab-honor__idx{
  display:block;
  font-family:var(--font-mono);
  font-size:2.6rem;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--accent);
  margin-bottom:12px;
}
.page-about .ab-honor h3{
  font-family:var(--font-display);
  font-weight:700;
  font-size:1.12rem;
  line-height:1.5;
  color:var(--ink);
  margin-bottom:10px;
}
.page-about .ab-honor p{
  font-size:.9rem;
  margin:0;
}

/* ========== 数据图表收尾 ========== */
.page-about .ab-datafoot{
  padding:16px 0 56px;
}
.page-about .ab-datafoot__grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
}
.page-about .ab-datafoot__cell{
  display:flex;
  flex-direction:column;
  gap:4px;
  padding:18px 14px;
  background:var(--bg-2);
  border:1px solid var(--line);
  clip-path:var(--bevel);
}
.page-about .ab-datafoot__cell .data-num{
  font-size:1.4rem;
}
.page-about .ab-datafoot__cell .data-label{
  font-size:.7rem;
}

/* ========== 响应式：平板及以上 ========== */
@media (min-width: 720px){
  .page-about .ab-hero{
    padding:56px 0 48px;
  }
  .page-about .ab-pagenav__inner{
    gap:12px;
  }
  .page-about .ab-tl-item__head{
    grid-template-columns:150px 1fr auto;
    gap:16px;
    align-items:center;
  }
  .page-about .ab-tl-item__toggle{
    justify-self:end;
    margin-top:0;
  }
  .page-about .ab-principles{
    grid-template-columns:1fr 1fr;
    gap:18px;
  }
  .page-about .ab-datafoot__grid{
    grid-template-columns:repeat(4,1fr);
  }
}

/* ========== 响应式：桌面 ========== */
@media (min-width: 960px){
  .page-about .ab-hero{
    padding:72px 0 64px;
  }
  .page-about .ab-hero__inner{
    display:grid;
    grid-template-columns:1fr 1fr;
  }
  .page-about .ab-hero__grid{
    grid-column:1 / 2;
    grid-template-columns:1fr;
  }
  .page-about .ab-hero__aside{
    grid-column:2 / 3;
    grid-row:1 / 2;
    align-self:end;
    justify-self:end;
    width:min(100%,320px);
    margin-top:60px;
  }
  .page-about .ab-hero__diag{
    display:block;
    position:absolute;
    right:-10px;
    top:36px;
    width:38%;
    max-width:420px;
    opacity:.65;
    pointer-events:none;
  }
  .page-about .ab-origin{
    padding:88px 0 64px;
  }
  .page-about .ab-origin__grid{
    grid-template-columns:1.2fr .8fr;
    gap:48px;
    align-items:start;
  }
  .page-about .ab-origin__aside{
    position:sticky;
    top:96px;
  }
  .page-about .ab-milestones{
    padding:88px 0;
  }
  .page-about .ab-philosophy{
    padding:88px 0 64px;
  }
  .page-about .ab-team{
    padding:88px 0;
  }
  .page-about .ab-team__grid{
    grid-template-columns:.9fr 1.1fr;
    gap:56px;
    align-items:center;
  }
  .page-about .ab-honors{
    padding:88px 0 72px;
  }
  .page-about .ab-honors__grid{
    grid-template-columns:1fr 1fr;
    gap:20px;
  }
  .page-about .ab-datafoot{
    padding:24px 0 72px;
  }
}