/* ===================== 关于678赛场 /about/ ===================== */
.page-about{
  background-color: var(--bg);
  background-image:
    radial-gradient(115% 72% at 86% -8%, rgba(74,134,255,.17), transparent 62%),
    radial-gradient(85% 55% at 2% 46%, rgba(79,224,208,.07), transparent 64%);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
}

.page-about .ab-block{
  padding: clamp(46px, 7vw, 92px) 0;
}

.page-about .ab-kicker{
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.4;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--teal);
}

.page-about .ab-title{
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about .ab-lede{
  margin: 0 0 24px;
  max-width: 62ch;
  color: var(--mist);
  font-size: 16.5px;
  line-height: 1.85;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  overflow: hidden;
  padding: clamp(64px, 11vw, 128px) 0 clamp(44px, 7vw, 84px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__bg{
  position: absolute;
  inset: 0;
  opacity: .17;
  pointer-events: none;
}

.page-about .about-hero__bg img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__veil{
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(10,17,32,.62) 0%, rgba(10,17,32,.88) 62%, var(--bg) 100%);
}

.page-about .about-hero__deco{
  position: absolute;
  right: clamp(-8px, 2vw, 44px);
  bottom: -0.24em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(96px, 22vw, 250px);
  line-height: .8;
  letter-spacing: -.05em;
  color: rgba(244,247,252,.05);
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero__inner{
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb{
  margin-bottom: clamp(24px, 4vw, 42px);
  font-size: 13px;
}

.page-about .about-hero__kicker{
  margin-bottom: 14px;
}

.page-about .about-hero__title{
  margin: 0 0 20px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 6.2vw, 64px);
  line-height: 1.08;
  letter-spacing: -.025em;
  color: var(--ink);
}

.page-about .about-hero__lede{
  margin: 0 0 30px;
  max-width: 58ch;
  color: var(--mist);
  font-size: clamp(15.5px, 1.6vw, 17.5px);
  line-height: 1.85;
}

.page-about .about-hero__facts{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 32px;
  padding: 0;
  list-style: none;
  max-width: 760px;
}

.page-about .about-hero__fact{
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(20,32,58,.55);
}

.page-about .about-hero__num{
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-hero__lab{
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--mist);
}

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

/* ---------- 起点与定位 ---------- */
.page-about .about-origin__grid{
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-origin__copy p{
  margin: 0 0 18px;
  color: var(--mist);
}

.page-about .about-origin__copy p:last-child{
  margin-bottom: 0;
}

.page-about .about-origin__copy strong{
  color: var(--ink);
  font-weight: 600;
}

.page-about .about-origin__panel{
  border-radius: var(--r-lg);
}

.page-about .about-origin__panel .panel__val{
  font-family: var(--font-mono);
  letter-spacing: -.01em;
}

/* ---------- 时间线 + 栏目 ---------- */
.page-about .about-body__grid{
  display: grid;
  gap: clamp(30px, 4vw, 60px);
}

.page-about .about-tl{
  padding: clamp(20px, 2.4vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(20,32,58,.62), rgba(13,26,46,.32));
}

.page-about .about-tl__head{
  margin: 0 0 24px;
}

.page-about .about-tl__title{
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.3vw, 26px);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-tl__sub{
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-tl__list{
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-tl__list::before{
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--teal) 0%, rgba(74,134,255,.5) 48%, rgba(79,224,208,.06) 100%);
}

.page-about .about-tl__item{
  position: relative;
  padding-bottom: 22px;
}

.page-about .about-tl__item:last-child{
  padding-bottom: 4px;
}

.page-about .about-tl__dot{
  position: absolute;
  left: -26px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 2px solid var(--teal);
  box-shadow: 0 0 0 4px rgba(79,224,208,.1);
}

.page-about .about-tl__time{
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .06em;
  color: var(--teal);
}

.page-about .about-tl__name{
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-tl__desc{
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-tl__note{
  display: block;
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-tl__note a{
  color: var(--blue-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(143,182,255,.35);
}

.page-about .about-cols__visual{
  margin: 0 0 20px;
}

.page-about .about-cols__visual .media-frame{
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .media-frame img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-cols{
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-col{
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(20,32,58,.42);
  overflow: hidden;
  transition: border-color .24s var(--ease);
}

.page-about .about-col[open]{
  border-color: rgba(79,224,208,.42);
  background: rgba(20,32,58,.62);
}

.page-about .about-col__sum{
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 58px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-col__sum::-webkit-details-marker{
  display: none;
}

.page-about .about-col__sum:focus-visible{
  outline: 2px solid var(--teal);
  outline-offset: -2px;
}

.page-about .about-col__idx{
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--blue-soft);
}

.page-about .about-col__name{
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.25;
  letter-spacing: -.005em;
  color: var(--ink);
}

.page-about .about-col__caret{
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-left: 2px;
  border-right: 2px solid var(--blue-soft);
  border-bottom: 2px solid var(--blue-soft);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform .24s var(--ease);
}

.page-about .about-col[open] .about-col__caret{
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-about .about-col__body{
  padding: 14px 18px 20px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-col__body p{
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-col__link{
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(79,224,208,.35);
  padding-bottom: 2px;
}

.page-about .about-col__link:hover{
  color: var(--ink);
  border-bottom-color: rgba(244,247,252,.5);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid{
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-team__visual .media-frame{
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-bars{
  display: grid;
  gap: 13px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .about-bar{
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(0, 1fr) 46px;
  align-items: center;
  gap: 12px;
}

.page-about .about-bar__key{
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-bar__track{
  height: 10px;
  border-radius: 999px;
  background: rgba(31,48,80,.78);
  overflow: hidden;
}

.page-about .about-bar__fill{
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--blue), var(--teal));
}

.page-about .about-bar__fill--a{ width: 41%; }
.page-about .about-bar__fill--b{ width: 30%; }
.page-about .about-bar__fill--c{ width: 22%; }
.page-about .about-bar__fill--d{ width: 7%; background: linear-gradient(90deg, var(--amber), var(--teal)); }

.page-about .about-bar__num{
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.4;
  text-align: right;
  color: var(--ink);
}

.page-about .about-team__note{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 三种用法 ---------- */
.page-about .about-scenes__list{
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scene{
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(20,32,58,.62), rgba(13,26,46,.3));
}

.page-about .about-scene__no{
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--teal);
}

.page-about .about-scene__name{
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.32;
  letter-spacing: -.005em;
  color: var(--ink);
}

.page-about .about-scene__desc{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-scene__stat{
  display: block;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--blue-soft);
}

/* ---------- 合作 ---------- */
.page-about .about-partners__inner{
  padding: clamp(26px, 4vw, 54px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(74,134,255,.16), transparent 62%),
    linear-gradient(180deg, rgba(20,32,58,.7), rgba(13,26,46,.38));
}

.page-about .about-partners__grid{
  display: grid;
  gap: clamp(24px, 3.4vw, 46px);
}

.page-about .about-partners__list{
  display: grid;
  gap: 11px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__item{
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-partners__item::before{
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
  transform: translateY(-3px);
}

.page-about .about-partners__cta{
  display: grid;
  gap: 12px;
  align-content: start;
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(10,17,32,.55);
}

.page-about .about-partners__cta-text{
  margin: 0 0 4px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px){
  .page-about .about-hero__facts{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 980px){
  .page-about .about-origin__grid{
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    align-items: start;
  }
  .page-about .about-team__grid{
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }
  .page-about .about-partners__grid{
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: center;
  }
}

@media (min-width: 1024px){
  .page-about .about-body__grid{
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
  .page-about .about-body__aside{
    position: sticky;
    top: 84px;
  }
}

@media (min-width: 900px){
  .page-about .about-scenes__list{
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (max-width: 480px){
  .page-about .about-col__sum{
    flex-wrap: wrap;
    gap: 8px 10px;
  }
  .page-about .about-col__name{
    flex: 1 1 auto;
  }
  .page-about .about-bar{
    grid-template-columns: minmax(64px, auto) minmax(0, 1fr) 42px;
    gap: 10px;
  }
  .page-about .about-hero__deco{
    display: none;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-col,
  .page-about .about-col__caret{
    transition: none;
  }
}