.page-about{
  --ab-edge: 28px;
  position: relative;
  background: var(--white);
  color: var(--graphite);
  overflow-x: hidden;
}

.page-about .breadcrumb{
  padding-top: 20px;
  padding-bottom: 4px;
}

.page-about .ab-sechead{
  max-width: 740px;
}

.page-about .ab-sechead h2{
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .ab-sechead__lede{
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--graphite);
}

/* ---------- 品牌定位 ---------- */
.page-about .ab-hero{
  position: relative;
  padding: 26px 0 58px;
  background-image:
    linear-gradient(var(--rule-light) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-light) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: -1px -1px;
}

.page-about .ab-hero__grid{
  display: grid;
  gap: 36px;
}

.page-about .ab-hero h1{
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 7.2vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 12em;
}

.page-about .ab-hero__lede{
  margin: 18px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .ab-hero__lede + .ab-hero__lede{
  margin-top: 12px;
  font-size: 16px;
  color: var(--cool);
}

.page-about .ab-stats{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 34px;
  border-top: 1px solid var(--rule-light);
  border-left: 1px solid var(--rule-light);
  background: rgba(255, 255, 255, .72);
}

.page-about .ab-stats > div{
  padding: 16px 14px 14px;
  border-right: 1px solid var(--rule-light);
  border-bottom: 1px solid var(--rule-light);
}

.page-about .ab-stats__num{
  display: block;
  font-size: 32px;
  line-height: 1;
  font-weight: 700;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stats__label{
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--cool);
}

.page-about .ab-hero__media{
  position: relative;
  margin: 0;
  background: var(--ink);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - var(--ab-edge)) 0, 100% var(--ab-edge), 100% 100%, var(--ab-edge) 100%, 0 calc(100% - var(--ab-edge)));
}

.page-about .ab-hero__media img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
}

.page-about .ab-hero__media::after{
  content: "";
  position: absolute;
  right: 16px;
  bottom: 16px;
  width: 46px;
  height: 2px;
  background: var(--orange);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .ab-stages-sec{
  padding: 58px 0 62px;
  background: var(--mist);
  border-top: 1px solid var(--rule-light);
  border-bottom: 1px solid var(--rule-light);
}

.page-about .ab-banner{
  margin: 30px 0 40px;
  background: var(--blue);
  border: 1px solid var(--rule-light);
  overflow: hidden;
}

.page-about .ab-banner img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 1;
  object-fit: cover;
}

.page-about .ab-stages{
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 40px;
}

.page-about .ab-stages::before{
  content: "";
  position: absolute;
  left: 13px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--rule) 45%, var(--rule-light) 100%);
}

.page-about .ab-stage{
  position: relative;
  padding-bottom: 34px;
}

.page-about .ab-stage:last-child{
  padding-bottom: 0;
}

.page-about .ab-stage + .ab-stage{
  border-top: 1px dashed var(--rule);
  padding-top: 30px;
}

.page-about .ab-stage::before{
  content: "";
  position: absolute;
  left: -34px;
  top: 6px;
  width: 14px;
  height: 14px;
  background: var(--mist);
  border: 2px solid var(--orange);
  transform: rotate(45deg);
}

.page-about .ab-stage__head{
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
}

.page-about .ab-stage__idx{
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .ab-stage__head h3{
  margin: 0;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-stage > p{
  margin: 12px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .ab-stage__list{
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-stage__list li{
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--cool);
}

.page-about .ab-stage__list li::before{
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 12px;
  height: 2px;
  background: var(--celadon);
}

.page-about .ab-stages__foot{
  margin: 34px 0 0;
}

/* ---------- 服务覆盖 ---------- */
.page-about .ab-cover{
  padding: 60px 0 64px;
  background: var(--blue);
  color: var(--mist);
}

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

.page-about .ab-cover .ab-sechead h2{
  color: var(--white);
}

.page-about .ab-cover .ab-sechead__lede{
  color: rgba(238, 244, 249, .82);
}

.page-about .ab-cover__grid{
  display: grid;
  gap: 32px;
  margin-top: 34px;
}

.page-about .ab-cover__blocks{
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 6px;
}

.page-about .ab-cover__blocks span{
  display: block;
  aspect-ratio: 1;
  background: rgba(143, 182, 212, .2);
  border: 1px solid rgba(143, 182, 212, .48);
}

.page-about .ab-cover__blocks span:nth-child(7n+3){
  background: rgba(53, 192, 160, .28);
  border-color: var(--celadon);
}

.page-about .ab-cover__cap{
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(238, 244, 249, .6);
}

.page-about .ab-cover__media{
  margin: 22px 0 0;
  border: 1px solid rgba(143, 182, 212, .3);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .ab-cover__media img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
}

.page-about .ab-cover__list dl{
  margin: 0;
  border-top: 1px solid rgba(143, 182, 212, .28);
}

.page-about .ab-cover__list dl > div{
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(143, 182, 212, .28);
}

.page-about .ab-cover__list dt{
  font-size: 13px;
  line-height: 1.6;
  color: rgba(238, 244, 249, .62);
}

.page-about .ab-cover__list dd{
  margin: 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--white);
  word-break: break-word;
}

/* ---------- 会员权益 ---------- */
.page-about .ab-member{
  padding: 60px 0 64px;
  background: var(--white);
}

.page-about .ab-matrix__legend{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  margin: 28px 0 0;
  font-size: 13px;
  color: var(--cool);
}

.page-about .ab-matrix__legend span{
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .ab-matrix__legend .ab-dot{
  width: 12px;
  height: 12px;
  aspect-ratio: auto;
  background: var(--mist);
  border: 1px solid var(--rule-light);
}

.page-about .ab-matrix__legend .ab-dot.is-on{
  background: var(--celadon);
  border-color: var(--celadon-deep);
}

.page-about .ab-matrix__note{
  color: var(--cool);
  font-size: 12px;
}

.page-about .ab-matrix{
  margin-top: 18px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 6px;
}

.page-about .ab-matrix__inner{
  min-width: 660px;
}

.page-about .ab-mrow{
  display: grid;
  grid-template-columns: 84px repeat(12, minmax(0, 1fr)) 58px;
  gap: 5px;
  align-items: center;
  padding: 9px 0;
  border-top: 1px solid var(--rule-light);
}

.page-about .ab-mrow:last-child{
  border-bottom: 1px solid var(--rule-light);
}

.page-about .ab-mrow--head{
  padding-bottom: 6px;
  border-top: 0;
}

.page-about .ab-mrow__tier{
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-mcol{
  text-align: center;
  font-size: 11px;
  color: var(--cool);
}

.page-about .ab-mrow__count{
  text-align: right;
  font-size: 15px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .ab-dot{
  display: block;
  width: 100%;
  aspect-ratio: 1;
  background: var(--mist);
  border: 1px solid var(--rule-light);
  transition: transform var(--t), background var(--t), border-color var(--t);
}

.page-about .ab-dot.is-on{
  background: var(--celadon);
  border-color: var(--celadon-deep);
}

.page-about .ab-dot.is-on:hover{
  background: var(--orange);
  border-color: var(--orange);
  transform: scale(1.35);
}

.page-about .ab-member__foot{
  margin-top: 34px;
  display: grid;
  gap: 20px;
  align-items: center;
}

.page-about .ab-member__foot p{
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--graphite);
}

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

/* ---------- 团队分工 ---------- */
.page-about .ab-team{
  padding: 58px 0 62px;
  background: var(--mist);
  border-top: 1px solid var(--rule-light);
  border-bottom: 1px solid var(--rule-light);
}

.page-about .ab-roles{
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule-light);
  border: 1px solid var(--rule-light);
}

.page-about .ab-roles li{
  background: var(--white);
  padding: 22px 20px 24px;
}

.page-about .ab-roles__idx{
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .ab-roles h3{
  margin: 10px 0 0;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-roles p{
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cool);
}

/* ---------- 合作对接 ---------- */
.page-about .ab-deal{
  padding: 60px 0 64px;
  background: var(--white);
}

.page-about .ab-deals{
  display: grid;
  gap: 14px;
  margin-top: 32px;
}

.page-about .ab-deal__item{
  background: var(--mist);
  border: 1px solid var(--rule-light);
  border-top: 3px solid var(--blue);
}

.page-about .ab-deal__item[open]{
  border-top-color: var(--orange);
}

.page-about .ab-deal__item summary{
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 18px 18px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-deal__item summary::after{
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-deal__item[open] summary::after{
  content: "–";
}

.page-about .ab-deal__num{
  font-size: 13px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: .08em;
}

.page-about .ab-deal__title{
  font-size: 18px;
  font-weight: 900;
  color: var(--ink);
}

.page-about .ab-deal__body{
  padding: 0 18px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.page-about .ab-deal__body p{
  margin: 0 0 10px;
}

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

.page-about .ab-deal__body li{
  position: relative;
  padding-left: 20px;
  color: var(--cool);
}

.page-about .ab-deal__body li::before{
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 2px;
  background: var(--celadon);
}

.page-about .ab-deal__foot{
  margin: 32px 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cool);
}

.page-about .ab-deal__foot a{
  color: var(--blue-mid);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 收尾行动 ---------- */
.page-about .ab-cta{
  position: relative;
  padding: 56px 0 62px;
  background: var(--ink);
  color: var(--mist);
  overflow: hidden;
}

.page-about .ab-cta::before{
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--rule-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-dark) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .55;
  pointer-events: none;
}

.page-about .ab-cta__inner{
  position: relative;
  display: grid;
  gap: 26px;
}

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

.page-about .ab-cta h2{
  margin: 12px 0 0;
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 16em;
}

.page-about .ab-cta p{
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(238, 244, 249, .82);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px){
  .page-about .ab-stats{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 768px){
  .page-about .ab-stats__num{
    font-size: 36px;
  }

  .page-about .ab-member__foot{
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .page-about .ab-roles{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px){
  .page-about .ab-hero{
    padding-bottom: 72px;
  }

  .page-about .ab-hero__grid{
    grid-template-columns: 7fr 5fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-cover__grid{
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }

  .page-about .ab-deals{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-cta__inner{
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
  }
}

@media (min-width: 1080px){
  .page-about .ab-roles{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stage{
    padding-bottom: 40px;
  }

  .page-about .ab-stage + .ab-stage{
    padding-top: 34px;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .ab-dot{
    transition: none;
  }

  .page-about .ab-dot.is-on:hover{
    transform: none;
  }
}