.page-about{
  --about-line: rgba(169,183,198,.18);
  --about-line-soft: rgba(169,183,198,.10);
  --about-ink-soft: #3C556E;
  background: var(--deep-sea);
  color: var(--white);
  font-family: var(--font-sans);
  overflow-x: hidden;
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .about-crumb-bar{
  padding-top: clamp(18px, 3.5vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  isolation: isolate;
  padding: clamp(26px, 5vw, 54px) 0 clamp(40px, 6vw, 76px);
}
.page-about .about-hero::before{
  content:"";
  position:absolute;
  inset: -30% -12% auto -12%;
  height: 700px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 72% at 12% 8%, rgba(0,229,255,.18), transparent 66%),
    radial-gradient(52% 66% at 88% 0%, rgba(255,159,28,.13), transparent 70%);
}
.page-about .about-hero::after{
  content:"";
  position:absolute;
  left: -10%;
  right: -10%;
  top: 46%;
  height: 1px;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(0,229,255,.55), rgba(255,159,28,.45), transparent);
  transform: rotate(-7deg);
  opacity: .6;
}

.page-about .about-kicker{
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-cyan);
  background: rgba(0,229,255,.07);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan-soft);
}
.page-about .kicker-dot{
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(0,229,255,.8);
}

.page-about .about-hero h1{
  margin: clamp(18px, 3vw, 30px) 0 0;
  font-size: clamp(38px, 8.2vw, 104px);
  line-height: .98;
  letter-spacing: -.03em;
  font-weight: 800;
}
.page-about .about-hero h1 .accent{
  color: var(--cyan);
}

.page-about .about-lead{
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 62ch;
  font-size: clamp(15.5px, 1.55vw, 18px);
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-hero-stats{
  margin: clamp(30px, 5vw, 54px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.page-about .hero-stat{
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 24px);
  background: linear-gradient(180deg, rgba(18,58,92,.55), rgba(6,23,38,.8));
}
.page-about .hero-stat dt{
  font-size: 13px;
  color: var(--gray);
  letter-spacing: .02em;
}
.page-about .hero-stat dd{
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(23px, 3vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--white);
}
.page-about .hero-stat .unit{
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--cyan-soft);
  margin-left: 5px;
  letter-spacing: 0;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-shell{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-index{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-about .about-index a{
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--about-line);
  font-size: 13.5px;
  color: var(--gray);
  text-decoration: none;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.page-about .about-index a span{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  margin-right: 7px;
}
.page-about .about-index a:hover,
.page-about .about-index a:focus-visible{
  color: var(--white);
  border-color: var(--line-cyan);
  background: rgba(0,229,255,.09);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter{
  padding-block: clamp(34px, 5vw, 64px);
  border-top: 1px solid var(--about-line-soft);
  scroll-margin-top: calc(var(--header-space) + 20px);
}
.page-about .about-chapter:first-child{
  border-top: 0;
  padding-top: 0;
}

.page-about .about-num{
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
  margin-bottom: 14px;
}
.page-about .about-num::after{
  content:"";
  display: block;
  width: 64px;
  height: 1px;
  background: var(--cyan);
  opacity: .65;
}

.page-about .about-title{
  margin: 0 0 14px;
  font-size: clamp(25px, 3.4vw, 38px);
  line-height: 1.22;
  letter-spacing: -.02em;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-lede{
  margin: 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-prose{
  margin-top: clamp(20px, 3vw, 30px);
  max-width: 68ch;
}
.page-about .about-prose p{
  margin: 0 0 1em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--gray);
}
.page-about .about-prose p:last-child{
  margin-bottom: 0;
}

/* ---------- 图片 ---------- */
.page-about .about-figure{
  margin: clamp(22px, 3.4vw, 36px) 0 0;
}
.page-about .about-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-line-soft);
}
.page-about .about-figure figcaption{
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline{
  position: relative;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}
.page-about .about-timeline::before{
  content:"";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(0,229,255,.65), rgba(255,159,28,.65), rgba(169,183,198,.08));
}
.page-about .tl-item{
  position: relative;
  padding: 0 0 clamp(24px, 3.2vw, 38px);
}
.page-about .tl-item:last-child{
  padding-bottom: 0;
}
.page-about .tl-item::before{
  content:"";
  position: absolute;
  left: -27px;
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255,159,28,.16);
}
.page-about .tl-year{
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.3vw, 27px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--amber);
}
.page-about .tl-title{
  margin: 0 0 8px;
  font-size: clamp(16.5px, 1.8vw, 20px);
  font-weight: 700;
  color: var(--white);
}
.page-about .tl-text{
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray);
}

/* ---------- 奶油纸区块 ---------- */
.page-about .about-chapter--paper{
  border-top: 0;
}
.page-about .about-paper{
  position: relative;
  overflow: hidden;
  border-radius: var(--r-xl);
  padding: clamp(22px, 4vw, 48px);
  background: var(--paper);
  color: var(--deep-sea);
  margin-block: clamp(8px, 2vw, 18px);
}
.page-about .about-paper::before{
  content:"";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,159,28,.20), transparent 70%);
  pointer-events: none;
}
.page-about .about-paper .about-num{
  color: var(--deep-sea);
}
.page-about .about-paper .about-num::after{
  background: var(--deep-sea);
  opacity: .45;
}
.page-about .about-paper .about-title{
  color: var(--deep-sea);
}
.page-about .about-paper .about-lede{
  color: var(--about-ink-soft);
}
.page-about .about-figure--paper img{
  border-color: rgba(10,37,64,.14);
}

.page-about .team-grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: clamp(12px, 2vw, 18px);
  margin-top: clamp(22px, 3.2vw, 34px);
}
.page-about .team-card{
  padding: clamp(16px, 2vw, 22px);
  border-radius: var(--r-md);
  border: 1px solid rgba(10,37,64,.14);
  background: rgba(10,37,64,.045);
}
.page-about .tnum{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(27px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--deep-sea);
}
.page-about .tlabel{
  margin: 9px 0 0;
  font-size: 14px;
  font-weight: 700;
  color: var(--deep-sea);
}
.page-about .tdesc{
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-ink-soft);
}
.page-about .about-prose--paper{
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .about-prose--paper p{
  color: var(--about-ink-soft);
}

/* ---------- 资质清单 ---------- */
.page-about .trust-list{
  list-style: none;
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}
.page-about .trust-list li{
  display: grid;
  grid-template-columns: 46px minmax(0,1fr);
  gap: clamp(10px, 2vw, 22px);
  padding: clamp(17px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--about-line);
}
.page-about .trust-idx{
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  padding-top: 3px;
}
.page-about .trust-name{
  margin: 0 0 7px;
  font-size: clamp(15.5px, 1.7vw, 19px);
  font-weight: 700;
  color: var(--white);
}
.page-about .trust-desc{
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray);
}

/* ---------- 服务网络 ---------- */
.page-about .network-wrap{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: clamp(22px, 3.4vw, 40px);
  margin-top: clamp(24px, 3.4vw, 38px);
}
.page-about .network-item{
  padding-left: 16px;
  border-left: 2px solid rgba(0,229,255,.35);
  margin-bottom: clamp(18px, 2.4vw, 26px);
}
.page-about .network-item:last-child{
  margin-bottom: 0;
}
.page-about .network-name{
  margin: 0 0 7px;
  font-size: clamp(16px, 1.7vw, 19px);
  font-weight: 700;
  color: var(--cyan-soft);
}
.page-about .network-desc{
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray);
}
.page-about .network-figure{
  margin: 0;
}

/* ---------- 指标 ---------- */
.page-about .metric-grid{
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 1px;
  margin-top: clamp(24px, 3.4vw, 40px);
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.page-about .metric{
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--midnight);
  transition: background .25s var(--ease), transform .25s var(--ease);
}
.page-about .metric:hover{
  background: var(--steel);
  transform: translateY(-2px);
}
.page-about .metric-num{
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(25px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--cyan);
}
.page-about .metric-num em{
  font-style: normal;
  font-size: .5em;
  font-weight: 600;
  color: var(--cyan-soft);
  margin-left: 3px;
  letter-spacing: 0;
}
.page-about .metric-label{
  margin: 11px 0 0;
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
}
.page-about .metric-hint{
  margin: 7px 0 0;
  font-size: 13px;
  line-height: 1.66;
  color: var(--gray);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta{
  margin-top: clamp(34px, 5vw, 64px);
  padding: clamp(26px, 4vw, 52px);
  border-radius: var(--r-xl);
  border: 1px solid var(--line-cyan);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(0,229,255,.20), transparent 62%),
    radial-gradient(120% 140% at 100% 100%, rgba(255,159,28,.20), transparent 62%),
    var(--steel);
}
.page-about .cta-title{
  margin: 0;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.28;
  letter-spacing: -.02em;
  font-weight: 700;
  color: var(--white);
}
.page-about .cta-text{
  margin: 14px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--gray);
}
.page-about .cta-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.8vw, 28px);
}
.page-about .cta-sub{
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
}
.page-about .cta-sub a{
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(124,243,255,.4);
  padding-bottom: 1px;
  margin: 0 2px;
}
.page-about .cta-sub a:hover,
.page-about .cta-sub a:focus-visible{
  color: var(--white);
  border-bottom-color: var(--white);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px){
  .page-about .team-grid{
    grid-template-columns: repeat(3, minmax(0,1fr));
  }
}

@media (min-width: 720px){
  .page-about .about-hero-stats{
    grid-template-columns: repeat(4, minmax(0,1fr));
  }
  .page-about .metric-grid{
    grid-template-columns: repeat(3, minmax(0,1fr));
  }
}

@media (min-width: 900px){
  .page-about .about-timeline{
    padding-left: 0;
  }
  .page-about .about-timeline::before{
    left: 50%;
    transform: translateX(-.5px);
  }
  .page-about .tl-item{
    width: 50%;
    padding-right: clamp(24px, 3vw, 42px);
    text-align: right;
    box-sizing: border-box;
  }
  .page-about .tl-item:nth-child(even){
    margin-left: 50%;
    padding-right: 0;
    padding-left: clamp(24px, 3vw, 42px);
    text-align: left;
  }
  .page-about .tl-item::before{
    left: auto;
    right: -6px;
    top: 12px;
  }
  .page-about .tl-item:nth-child(even)::before{
    left: -6px;
    right: auto;
  }
  .page-about .tl-item:nth-child(odd) .tl-text{
    margin-left: auto;
  }
}

@media (min-width: 960px){
  .page-about .network-wrap{
    grid-template-columns: minmax(0,1fr) minmax(0,.85fr);
    align-items: center;
  }
}

@media (min-width: 1000px){
  .page-about .about-shell{
    grid-template-columns: 186px minmax(0,1fr);
    gap: clamp(30px, 4vw, 62px);
    align-items: start;
  }
  .page-about .about-index{
    position: sticky;
    top: calc(var(--header-space) + 16px);
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    padding-left: 14px;
    border-left: 1px solid var(--about-line);
  }
  .page-about .about-index a{
    padding: 8px 10px;
    border-radius: var(--r-sm);
    border-color: transparent;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .metric,
  .page-about .about-index a,
  .page-about .cta-sub a{
    transition: none;
  }
  .page-about .metric:hover{
    transform: none;
  }
}