.page-about{
  --about-on-dark:rgba(255,255,255,0.88);
  --about-on-dark-strong:#ffffff;
  --about-line-soft:rgba(255,255,255,0.28);
  --about-map-overlay:linear-gradient(180deg, rgba(11,82,102,0.86) 0%, rgba(14,90,138,0.78) 100%);
  background:var(--c-bg);
}
.page-about .about-breadcrumb{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
  padding-top:24px;
  padding-bottom:8px;
  font-family:var(--font-heading);
  font-size:14px;
  color:var(--c-muted);
}
.page-about .about-breadcrumb a{
  color:var(--c-primary);
  text-decoration:none;
  font-weight:600;
  transition:color .2s ease;
}
.page-about .about-breadcrumb a:hover{
  color:var(--c-accent);
}
.page-about .about-breadcrumb [aria-current="page"]{
  color:var(--c-text);
}

/* 01 品牌定位与使命 */
.page-about .about-mission{
  position:relative;
  padding-top:28px;
  padding-bottom:72px;
}
.page-about .about-mission::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:8px;
  background:linear-gradient(90deg, var(--c-jewel-teal) 0 18%, var(--c-primary) 18% 34%, var(--c-accent) 34% 46%, transparent 46%);
}
.page-about .about-mission__grid{
  display:grid;
  gap:44px;
  align-items:center;
  padding-top:24px;
}
.page-about .about-kicker{
  display:inline-block;
  font-family:var(--font-heading);
  font-size:13px;
  font-weight:700;
  letter-spacing:.12em;
  color:var(--c-accent);
  text-transform:uppercase;
  background:rgba(243,156,18,.12);
  border-radius:var(--radius-pill);
  padding:8px 16px;
}
.page-about .about-mission__title{
  font-family:var(--font-heading);
  font-size:30px;
  line-height:1.25;
  margin:18px 0 20px;
  color:var(--c-primary);
  letter-spacing:.02em;
}
.page-about .about-mission__lead{
  font-family:var(--font-body);
  font-size:18px;
  line-height:1.7;
  color:var(--c-text);
  margin-bottom:16px;
}
.page-about .about-mission__text{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--c-text);
  margin-bottom:14px;
}
.page-about .about-mission__quote{
  margin:24px 0;
  padding:20px 22px;
  border-radius:var(--radius-lg);
  background:linear-gradient(135deg, rgba(14,90,138,.08) 0%, rgba(243,156,18,.1) 100%);
  border-left:6px solid var(--c-accent);
  font-family:var(--font-body);
  font-weight:600;
  color:var(--c-primary);
  line-height:1.7;
}
.page-about .about-mission__links{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:28px;
}
.page-about .about-mission__media{
  margin:0;
  position:relative;
}
.page-about .about-mission__media-frame{
  position:relative;
  border-radius:var(--radius-lg);
  overflow:hidden;
  background:var(--c-surface);
  box-shadow:0 24px 48px rgba(14,90,138,.18);
}
.page-about .about-mission__media-frame::before{
  content:"";
  position:absolute;
  top:-18px;
  right:-14px;
  width:58%;
  height:58%;
  background:var(--c-accent);
  border-radius:var(--radius-lg);
  opacity:.16;
  transform:rotate(2.5deg);
  z-index:0;
}
.page-about .about-mission__media img{
  position:relative;
  display:block;
  width:100%;
  height:auto;
  border-radius:var(--radius-lg);
  object-fit:cover;
}
.page-about .about-mission__badge{
  position:absolute;
  left:18px;
  bottom:18px;
  display:inline-flex;
  align-items:center;
  gap:8px;
  background:rgba(248,249,250,.92);
  color:var(--c-primary);
  font-family:var(--font-num);
  font-size:15px;
  font-weight:700;
  letter-spacing:.04em;
  padding:10px 18px;
  border-radius:var(--radius-pill);
  box-shadow:0 8px 20px rgba(14,90,138,.18);
  z-index:2;
}
.page-about .about-mission__badge::before{
  content:"";
  width:10px;
  height:10px;
  border-radius:50%;
  background:var(--c-accent);
  box-shadow:0 0 0 4px rgba(243,156,18,.22);
}
.page-about .about-mission__media figcaption{
  margin-top:14px;
  font-size:13px;
  line-height:1.6;
  color:var(--c-muted);
}

/* 02 数据能力图谱 */
.page-about .about-capacity{
  position:relative;
  overflow:hidden;
  background:
    radial-gradient(ellipse at 82% 8%, rgba(243,156,18,.2) 0%, transparent 42%),
    linear-gradient(135deg, var(--c-primary) 0%, var(--c-jewel-teal) 100%);
  color:var(--about-on-dark);
  padding-top:72px;
  padding-bottom:88px;
}
.page-about .about-capacity__pattern{
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(-45deg, transparent 0 18px, rgba(255,255,255,.034) 18px 36px);
  pointer-events:none;
  z-index:1;
}
.page-about .about-capacity__map-wrap{
  position:absolute;
  inset:0;
  z-index:1;
  overflow:hidden;
}
.page-about .about-capacity__map-wrap::after{
  content:"";
  position:absolute;
  inset:0;
  background:var(--about-map-overlay);
}
.page-about .about-capacity__map-img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  background:var(--c-jewel-teal);
  opacity:.24;
}
.page-about .about-capacity__inner{
  position:relative;
  z-index:2;
}
.page-about .about-capacity__head{
  max-width:680px;
}
.page-about .about-capacity__head .section-index{
  color:var(--c-accent);
}
.page-about .about-capacity__head .section-title{
  color:var(--about-on-dark-strong);
}
.page-about .about-capacity__head .section-lead{
  color:var(--about-on-dark);
}

/* 技能树 */
.page-about .about-tree{
  display:grid;
  gap:36px;
  margin-top:56px;
}
.page-about .about-tree__core{
  justify-self:center;
  display:inline-flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:8px 18px;
  background:var(--about-on-dark-strong);
  color:var(--c-primary);
  border-radius:var(--radius-pill);
  padding:18px 32px;
  box-shadow:0 18px 44px rgba(0,0,0,.26);
  text-align:center;
}
.page-about .about-tree__core::before{
  content:"";
  width:14px;
  height:14px;
  border-radius:50%;
  background:var(--c-accent);
  box-shadow:0 0 0 6px rgba(243,156,18,.2);
}
.page-about .about-tree__core-name{
  font-family:var(--font-heading);
  font-size:18px;
  font-weight:700;
  letter-spacing:.04em;
}
.page-about .about-tree__core-meta{
  display:block;
  width:100%;
  font-family:var(--font-num);
  font-size:13px;
  letter-spacing:.1em;
  color:var(--c-muted);
}
.page-about .about-tree__branches{
  display:grid;
  gap:18px;
  position:relative;
}
.page-about .about-tree__branch{
  background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.16);
  border-radius:var(--radius-lg);
  padding:0;
  transition:background .25s ease, border-color .25s ease, transform .25s ease;
  position:relative;
}
.page-about .about-tree__branch:hover,
.page-about .about-tree__branch:focus-within{
  background:rgba(255,255,255,.12);
  border-color:rgba(243,156,18,.55);
  transform:translateY(-3px);
}
.page-about .about-tree__branch-head{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 12px;
  padding:20px 22px;
  cursor:pointer;
  list-style:none;
  font-family:var(--font-heading);
}
.page-about .about-tree__branch-head::-webkit-details-marker{
  display:none;
}
.page-about .about-tree__layer{
  display:inline-block;
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--c-white);
  background:var(--c-accent);
  border-radius:var(--radius-pill);
  padding:6px 14px;
  white-space:nowrap;
}
.page-about .about-tree__desc{
  font-size:15px;
  font-weight:600;
  color:var(--about-on-dark-strong);
}
.page-about .about-tree__toggle{
  position:relative;
  width:18px;
  height:18px;
  margin-left:auto;
  border-radius:50%;
  background:rgba(255,255,255,.16);
  flex:0 0 18px;
}
.page-about .about-tree__toggle::before,
.page-about .about-tree__toggle::after{
  content:"";
  position:absolute;
  background:var(--about-on-dark-strong);
  border-radius:2px;
}
.page-about .about-tree__toggle::before{
  left:6px;
  right:6px;
  top:8px;
  height:2px;
}
.page-about .about-tree__toggle::after{
  top:6px;
  bottom:6px;
  left:8px;
  width:2px;
}
.page-about .about-tree__branch[open] .about-tree__toggle::after{
  opacity:0;
}
.page-about .about-tree__children{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  list-style:none;
  margin:0;
  padding:0 22px 22px;
}
.page-about .about-tree__child{
  display:inline-block;
  font-family:var(--font-heading);
  font-size:14px;
  color:var(--about-on-dark-strong);
  background:rgba(11,82,102,.26);
  border:1px solid rgba(255,255,255,.22);
  border-radius:var(--radius-pill);
  padding:8px 16px;
  transition:background .2s ease;
}
.page-about .about-tree__child:hover{
  background:rgba(243,156,18,.26);
  border-color:var(--c-accent);
}

/* 03 发展里程碑 */
.page-about .about-milestones{
  background:
    linear-gradient(135deg, rgba(14,90,138,.04) 25%, transparent 25%) 0 0 / 40px 40px,
    var(--c-bg);
  padding-top:64px;
  padding-bottom:76px;
}
.page-about .about-milestones__head{
  max-width:640px;
}
.page-about .about-timeline{
  list-style:none;
  margin:0;
  padding:0;
  margin-top:44px;
  max-width:860px;
}
.page-about .about-timeline__item{
  position:relative;
  display:grid;
  grid-template-columns:24px 72px 1fr;
  gap:16px;
  align-items:start;
  margin-bottom:34px;
}
.page-about .about-timeline__item:last-child{
  margin-bottom:0;
}
.page-about .about-timeline__dot{
  position:relative;
  top:10px;
  display:block;
  width:16px;
  height:16px;
  border-radius:50%;
  background:var(--c-accent);
  border:5px solid var(--c-white);
  box-shadow:0 0 0 2px var(--c-accent);
  transition:box-shadow .3s ease, transform .3s ease;
}
.page-about .about-timeline__item:not(:last-child) .about-timeline__dot::after{
  content:"";
  position:absolute;
  top:22px;
  bottom:-46px;
  left:50%;
  width:2px;
  transform:translateX(-50%);
  background:linear-gradient(180deg, var(--c-primary), rgba(14,90,138,.22));
  opacity:.4;
}
.page-about .about-timeline__item.is-revealed .about-timeline__dot{
  transform:scale(1.18);
  box-shadow:0 0 0 5px rgba(243,156,18,.24);
}
.page-about .about-timeline__year{
  font-family:var(--font-num);
  font-size:30px;
  font-weight:700;
  line-height:1.16;
  color:var(--c-primary);
}
.page-about .about-timeline__content{
  background:var(--c-white);
  border:1px solid var(--c-surface);
  border-radius:var(--radius-lg);
  padding:18px 22px;
  box-shadow:0 8px 24px rgba(14,90,138,.07);
  transition:box-shadow .25s ease, transform .25s ease;
}
.page-about .about-timeline__content:hover{
  box-shadow:0 14px 32px rgba(14,90,138,.12);
  transform:translateY(-2px);
}
.page-about .about-timeline__content h3{
  font-family:var(--font-heading);
  font-size:17px;
  margin:0 0 8px;
  color:var(--c-text);
}
.page-about .about-timeline__content p{
  margin:0;
  font-family:var(--font-body);
  font-size:15px;
  line-height:1.7;
  color:var(--c-muted);
}

/* 04 团队与资质 */
.page-about .about-team{
  padding-top:72px;
  padding-bottom:80px;
  background:var(--c-bg);
}
.page-about .about-team__grid{
  display:grid;
  gap:44px;
  align-items:center;
}
.page-about .about-team__content .section-title{
  margin-top:14px;
  margin-bottom:18px;
  color:var(--c-primary);
}
.page-about .about-team__lead{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.7;
  color:var(--c-text);
  margin-bottom:20px;
}
.page-about .about-team__list{
  list-style:none;
  margin:0 0 28px;
  padding:0;
  display:grid;
  gap:10px;
}
.page-about .about-team__list li{
  position:relative;
  padding-left:26px;
  font-family:var(--font-heading);
  font-size:15px;
  color:var(--c-text);
}
.page-about .about-team__list li::before{
  content:"";
  position:absolute;
  left:0;
  top:4px;
  width:14px;
  height:14px;
  border-radius:50%;
  background:var(--c-supplement);
  opacity:.85;
}
.page-about .about-team__stats{
  display:flex;
  flex-wrap:wrap;
  gap:18px 40px;
  margin-top:8px;
}
.page-about .about-team__stat{
  display:flex;
  align-items:baseline;
  gap:10px;
  flex-wrap:wrap;
}
.page-about .about-team__stat-num{
  font-family:var(--font-num);
  font-size:34px;
  font-weight:700;
  color:var(--c-accent);
  line-height:1;
}
.page-about .about-team__stat-label{
  font-family:var(--font-heading);
  font-size:14px;
  color:var(--c-muted);
  max-width:88px;
}
.page-about .about-team__media{
  margin:0;
  position:relative;
}
.page-about .about-team__media img{
  display:block;
  width:100%;
  height:auto;
  border-radius:var(--radius-lg);
  box-shadow:0 20px 44px rgba(14,90,138,.16);
}
.page-about .about-team__media-note{
  display:block;
  margin-top:12px;
  font-size:13px;
  line-height:1.6;
  color:var(--c-muted);
}

/* 产品版本演进 */
.page-about .about-versions{
  margin-top:72px;
  padding:32px 24px;
  background:var(--c-white);
  border-radius:var(--radius-lg);
  border-top:6px solid var(--c-jewel-wine);
  box-shadow:0 12px 40px rgba(14,90,138,.08);
  display:grid;
  gap:28px;
}
.page-about .about-versions__eyebrow{
  font-family:var(--font-heading);
  font-size:13px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--c-jewel-wine);
  text-transform:uppercase;
}
.page-about .about-versions__intro h3{
  margin:10px 0 6px;
  font-family:var(--font-heading);
  font-size:20px;
  color:var(--c-text);
}
.page-about .about-versions__intro p{
  margin:0;
  font-family:var(--font-body);
  font-size:15px;
  line-height:1.7;
  color:var(--c-muted);
}
.page-about .about-versions__list{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:14px;
}
.page-about .about-versions__item{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:4px;
  padding:18px 14px;
  border-radius:var(--radius-md);
  background:linear-gradient(135deg, var(--c-surface) 0%, rgba(243,156,18,.1) 100%);
  text-align:center;
  min-height:108px;
}
.page-about .about-versions__name{
  font-family:var(--font-heading);
  font-size:14px;
  font-weight:600;
  color:var(--c-text);
}
.page-about .about-versions__num{
  font-family:var(--font-num);
  font-size:32px;
  font-weight:700;
  line-height:1.1;
  color:var(--c-primary);
}
.page-about .about-versions__unit{
  font-family:var(--font-heading);
  font-size:12px;
  color:var(--c-muted);
}

/* CTA 引导条 */
.page-about .about-team__cta{
  margin-top:48px;
  padding:30px 26px;
  border-radius:var(--radius-lg);
  background:linear-gradient(135deg, var(--c-jewel-teal) 0%, var(--c-primary) 100%);
  color:var(--c-white);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:18px;
  box-shadow:0 20px 44px rgba(14,90,138,.22);
}
.page-about .about-team__cta p{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  margin:0;
  flex:1 1 280px;
  color:rgba(255,255,255,.94);
}
.page-about .about-team__cta-actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
}
.page-about .about-team__cta .btn--outline{
  border-color:rgba(255,255,255,.9);
  color:var(--c-white);
}
.page-about .about-team__cta .btn--outline:hover{
  background:rgba(255,255,255,.14);
}

@media (min-width:641px){
  .page-about .about-mission__title{
    font-size:38px;
  }
  .page-about .about-versions{
    padding:40px 36px;
    grid-template-columns:minmax(0, 5fr) minmax(0, 7fr);
    align-items:center;
  }
  .page-about .about-versions__list{
    grid-template-columns:repeat(4, 1fr);
  }
  .page-about .about-team__cta{
    padding:36px 40px;
  }
}

@media (min-width:861px){
  .page-about .about-mission{
    padding-top:40px;
    padding-bottom:96px;
  }
  .page-about .about-mission__grid{
    grid-template-columns:minmax(0, 6fr) minmax(0, 4fr);
    gap:64px;
  }
  .page-about .about-mission__title{
    font-size:40px;
    line-height:1.22;
  }
  .page-about .about-capacity{
    padding-top:92px;
    padding-bottom:104px;
  }
  .page-about .about-tree__branches{
    grid-template-columns:repeat(3, 1fr);
    gap:28px;
  }
  .page-about .about-tree__branches::before{
    content:"";
    position:absolute;
    top:12px;
    left:6%;
    right:6%;
    height:2px;
    background:linear-gradient(90deg, transparent, rgba(243,156,18,.7) 20%, rgba(243,156,18,.7) 80%, transparent);
    opacity:.6;
  }
  .page-about .about-tree__branch-head{
    padding:22px 24px;
  }
  .page-about .about-tree__children{
    padding:0 24px 24px;
  }
  .page-about .about-milestones{
    padding-top:88px;
    padding-bottom:96px;
  }
  .page-about .about-timeline{
    margin-top:56px;
  }
  .page-about .about-timeline__item{
    grid-template-columns:32px 112px 1fr;
    gap:24px;
  }
  .page-about .about-timeline__year{
    font-size:40px;
  }
  .page-about .about-timeline__content{
    padding:22px 26px;
  }
  .page-about .about-timeline__content h3{
    font-size:19px;
  }
  .page-about .about-team{
    padding-top:92px;
    padding-bottom:96px;
  }
  .page-about .about-team__grid{
    grid-template-columns:minmax(0, 6fr) minmax(0, 5fr);
    gap:64px;
  }
  .page-about .about-team__stat-num{
    font-size:44px;
  }
  .page-about .about-versions{
    margin-top:88px;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-tree__branch,
  .page-about .about-timeline__content,
  .page-about .about-mission__media-frame::before{
    transition:none;
    transform:none;
  }
  .page-about .about-tree__branch:hover{
    transform:none;
  }
  .page-about .about-timeline__content:hover{
    transform:none;
  }
}