.page-about{
  --about-panel-grad: linear-gradient(135deg, rgba(0,255,136,.08), transparent 60%);
  --about-line-light: rgba(192,192,192,.16);
  position: relative;
  background: var(--space-blue);
  color: var(--ice);
  overflow-x: hidden;
  font-family: var(--font-body);
}

/* 面包屑 */
.page-about .about-crumb{
  padding: 18px 24px 4px;
  font-size: 14px;
  color: var(--muted);
  letter-spacing: .02em;
}
.page-about .about-crumb a{
  color: var(--muted);
  text-decoration: none;
  transition: color var(--transition);
}
.page-about .about-crumb a:hover{
  color: var(--neon);
}
.page-about .about-crumb span[aria-current="page"]{
  color: var(--ice);
}

/* 品牌宣言 */
.page-about .about-manifesto{
  position: relative;
  padding: 40px 0 72px;
}
.page-about .about-manifesto::before{
  content: "";
  position: absolute;
  right: -100px;
  top: -60px;
  width: 440px;
  height: 280px;
  background: var(--about-panel-grad);
  clip-path: polygon(12% 0, 100% 0, 100% 100%, 0 76%);
  transform: skewX(-12deg);
  pointer-events: none;
}
.page-about .about-manifesto::after{
  content: "";
  position: absolute;
  left: -60px;
  bottom: -20px;
  width: 200px;
  height: 200px;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% 78%, 78% 100%, 0 100%);
  pointer-events: none;
}
.page-about .about-manifesto__inner{
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}
.page-about .about-manifesto__copy .tag{
  display: inline-block;
  margin-bottom: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 6px 12px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--silver);
  border-radius: var(--radius);
}
.page-about .about-manifesto__copy h1{
  margin: 0 0 20px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(32px, 6vw, 52px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ice);
}
.page-about .about-manifesto__lead{
  margin: 0 0 16px;
  font-size: 18px;
  line-height: 1.75;
  color: var(--ice);
}
.page-about .about-manifesto__desc{
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}
.page-about .about-manifesto__metrics{
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  margin-bottom: 28px;
  padding: 16px 18px;
  background: var(--panel);
  border-left: 4px solid var(--neon);
  border-radius: var(--radius);
}
.page-about .about-metric{
  font-size: 14px;
  color: var(--muted);
}
.page-about .about-metric strong{
  display: block;
  font-size: 22px;
  line-height: 1.2;
  color: var(--neon);
}
.page-about .about-manifesto__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-manifesto__media{
  position: relative;
  padding-top: 14px;
}
.page-about .about-manifesto__media::before{
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 72%;
  height: 10px;
  background: var(--neon);
  clip-path: polygon(0 0, 100% 0, calc(100% - 14px) 100%, 0 100%);
  opacity: .8;
}
.page-about .about-manifesto__media img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16/10;
  object-fit: cover;
  background: var(--midnight);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

/* 发展里程碑 */
.page-about .about-milestones{
  position: relative;
  padding: 64px 0 76px;
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), calc(100% - 36px) 100%, 0 100%);
}
.page-about .about-milestones__head{
  max-width: 760px;
  margin-bottom: 32px;
}
.page-about .about-milestones__head .section-subtitle{
  margin: 0 0 8px;
  color: var(--neon);
  font-size: 14px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.page-about .about-milestones__head h2{
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.2;
  color: var(--ice);
}
.page-about .about-milestones__head p{
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}
.page-about .about-milestones__layout{
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
.page-about .about-milestones__visual img{
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--midnight);
  border-radius: var(--radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), 24px calc(100% - 24px), 24px 100%, 0 100%);
}
.page-about .about-timeline{
  position: relative;
  margin: 0;
  padding-left: 28px;
  list-style: none;
}
.page-about .about-timeline::before{
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon) 0%, var(--silver) 55%, var(--line) 100%);
}
.page-about .about-timeline__item{
  position: relative;
  margin-bottom: 32px;
}
.page-about .about-timeline__item::before{
  content: "";
  position: absolute;
  left: -28px;
  top: 16px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--space-blue);
  border: 2px solid var(--neon);
  box-shadow: 0 0 0 4px rgba(0,255,136,.12);
}
.page-about .about-timeline__item details{
  padding: 0 0 0 16px;
}
.page-about .about-timeline__item summary{
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  transition: color var(--transition);
}
.page-about .about-timeline__item summary::-webkit-details-marker{
  display: none;
}
.page-about .about-timeline__item summary:hover .about-timeline__label{
  color: var(--neon);
}
.page-about .about-timeline__year{
  font-family: var(--font-data);
  font-size: 18px;
  font-weight: 700;
  color: var(--neon);
}
.page-about .about-timeline__label{
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  color: var(--ice);
  transition: color var(--transition);
}
.page-about .about-timeline__mark{
  margin-left: auto;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  color: var(--silver);
  font-size: 18px;
  line-height: 1;
  border-radius: var(--radius);
  transition: all var(--transition);
}
.page-about .about-timeline__mark::before{
  content: "+";
}
.page-about .about-timeline__item details[open] .about-timeline__mark{
  background: var(--neon);
  border-color: var(--neon);
  color: var(--space-blue);
}
.page-about .about-timeline__item details[open] .about-timeline__mark::before{
  content: "–";
}
.page-about .about-timeline__item details p{
  margin: 14px 0 0;
  padding: 16px 18px;
  background: var(--space-blue);
  border-left: 3px solid var(--neon);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  border-radius: var(--radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

/* 数据能力与覆盖 */
.page-about .about-data{
  position: relative;
  padding: 68px 0 80px;
}
.page-about .about-data__head{
  max-width: 800px;
  margin-bottom: 28px;
}
.page-about .about-data__head .section-subtitle{
  margin: 0 0 8px;
  color: var(--neon);
  font-size: 14px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.page-about .about-data__head h2{
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.2;
  color: var(--ice);
}
.page-about .about-data__head p{
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}
.page-about .about-stats{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 44px;
}
.page-about .about-stat{
  position: relative;
  padding: 22px 16px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--transition), transform var(--transition);
}
.page-about .about-stat::after{
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background: var(--neon);
}
.page-about .about-stat:hover{
  border-color: var(--neon);
  transform: translateY(-2px);
}
.page-about .about-stat .stat-value{
  display: block;
  font-family: var(--font-data);
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.15;
  font-weight: 700;
  color: var(--neon);
  margin-bottom: 6px;
}
.page-about .about-stat .stat-label{
  display: block;
  font-size: 14px;
  color: var(--muted);
}
.page-about .about-data__layout{
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-about .about-data__media img{
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--midnight);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-about .about-data__facts{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-data__facts li{
  position: relative;
  padding: 14px 16px 14px 20px;
  border: 1px solid var(--line);
  border-left-width: 4px;
  border-left-color: var(--silver);
  background: rgba(17,34,64,.6);
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  border-radius: var(--radius);
}
.page-about .about-data__facts li:first-child{
  border-left-color: var(--neon);
}
.page-about .about-data__facts span{
  font-family: var(--font-data);
  color: var(--ice);
  font-weight: 600;
}

/* 团队与资质 */
.page-about .about-team{
  padding: 68px 0 84px;
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 4px solid var(--neon);
}
.page-about .about-team__head{
  max-width: 800px;
  margin-bottom: 28px;
}
.page-about .about-team__head .section-subtitle{
  margin: 0 0 8px;
  color: var(--neon);
  font-size: 14px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.page-about .about-team__head h2{
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1.2;
  color: var(--ice);
}
.page-about .about-team__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-about .about-team__intro{
  padding: 8px 0 8px 20px;
  border-left: 4px solid var(--neon);
}
.page-about .about-team__intro p{
  color: var(--muted);
  line-height: 1.85;
  margin: 0 0 14px;
}
.page-about .about-team__intro p:last-child{
  margin-bottom: 0;
}
.page-about .about-team__cred{
  display: flex;
  flex-direction: column;
}
.page-about .about-cred-card{
  border: 1px solid var(--line);
  background: var(--space-blue);
  padding: 26px;
  border-radius: var(--radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color var(--transition);
}
.page-about .about-cred-card:hover{
  border-color: var(--neon);
}
.page-about .about-cred-card h3{
  margin: 0 0 18px;
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--ice);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.page-about .about-cred-card h3::after{
  content: "";
  flex: 0 0 auto;
  width: 36px;
  height: 5px;
  background: var(--neon);
  clip-path: polygon(0 0, 100% 0, calc(100% - 7px) 100%, 0 100%);
}
.page-about .about-cred-card .card-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-cred-card .card-list li{
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .about-cred-card .card-list li::before{
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 9px;
  background: var(--silver);
  clip-path: polygon(0 0, 100% 0, 0 100%);
}

@media (min-width: 680px){
  .page-about .about-stats{
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-data__layout{
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
  .page-about .about-data__media{
    padding-right: 8px;
  }
  .page-about .about-team__grid{
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (min-width: 960px){
  .page-about .about-manifesto{
    padding: 56px 0 96px;
  }
  .page-about .about-manifesto__inner{
    grid-template-columns: 1.05fr 0.95fr;
    gap: 48px;
  }
  .page-about .about-milestones{
    padding: 72px 0 84px;
  }
  .page-about .about-milestones__layout{
    grid-template-columns: 0.9fr 1.1fr;
    gap: 48px;
    align-items: start;
  }
  .page-about .about-milestones__visual{
    position: sticky;
    top: 140px;
  }
  .page-about .about-data{
    padding: 80px 0 96px;
  }
  .page-about .about-data__layout{
    gap: 48px;
  }
  .page-about .about-team{
    padding: 80px 0 96px;
  }
  .page-about .about-team__grid{
    gap: 48px;
  }
}