.page-about{
  --rail-w: 208px;
  --sec-gap: clamp(44px, 6vw, 84px);
  --about-cut: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  --about-cut-sm: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 9px 100%, 0 calc(100% - 9px));
  display: block;
}

/* ---------- 开场 ---------- */
.page-about .about-hero{
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(28px, 4vw, 52px);
  background:
    radial-gradient(110% 80% at 86% -10%, rgba(79, 216, 224, .10), transparent 58%),
    radial-gradient(90% 70% at 4% 0%, rgba(182, 255, 59, .07), transparent 60%),
    linear-gradient(180deg, rgba(20, 64, 107, .34), transparent 72%);
}

.page-about .about-hero::after{
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--track) 18%, var(--lime) 52%, var(--track) 82%, transparent);
  opacity: .55;
}

.page-about .about-hero__inner{
  display: grid;
  gap: clamp(22px, 4vw, 46px);
  align-items: center;
  min-width: 0;
}

.page-about .about-hero__copy{
  min-width: 0;
}

.page-about .about-hero h1{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 6.4vw, 52px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--text);
  margin: 14px 0 0;
  overflow-wrap: break-word;
}

.page-about .about-hero .lede{
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__media{
  margin: 0;
  clip-path: var(--about-cut);
  min-width: 0;
}

.page-about .about-hero__media .media__img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 规模数字 ---------- */
.page-about .about-numbers{
  padding: 0 0 clamp(30px, 5vw, 54px);
}

.page-about .about-nums{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-num{
  background: linear-gradient(158deg, var(--panel) 0%, var(--panel-deep) 100%);
  border: 1px solid var(--track);
  clip-path: var(--about-cut-sm);
  padding: 15px 16px 17px;
  transition: border-color var(--ease), background var(--ease);
}

.page-about .about-num:hover,
.page-about .about-num:focus-within{
  border-color: var(--lime);
}

.page-about .about-num__value{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 27px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--lime);
  line-height: 1.2;
}

.page-about .about-num__label{
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 主体：刻度栏 + 长文 ---------- */
.page-about .about-body{
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  padding-bottom: clamp(48px, 7vw, 96px);
  min-width: 0;
}

.page-about .about-rail{
  border-top: 1px solid var(--track);
  border-bottom: 1px solid var(--track);
  padding: 12px 0 14px;
  min-width: 0;
}

.page-about .about-rail__title{
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-rail__list{
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list li{
  flex: none;
}

.page-about .about-rail__link{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 13px;
  border: 1px solid var(--track);
  clip-path: var(--about-cut-sm);
  color: var(--text);
  font-size: 13px;
  text-decoration: none;
  transition: border-color var(--ease), color var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible{
  border-color: var(--lime);
  color: var(--lime);
}

.page-about .about-rail__num{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}

.page-about .about-rail__link:hover .about-rail__num,
.page-about .about-rail__link:focus-visible .about-rail__num{
  color: var(--lime);
}

.page-about .about-flow{
  display: flex;
  flex-direction: column;
  gap: var(--sec-gap);
  min-width: 0;
}

/* ---------- 分节 ---------- */
.page-about .about-section{
  border-top: 1px solid var(--track);
  padding-top: 4px;
  min-width: 0;
  scroll-margin-top: 130px;
}

.page-about .about-section__head{
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 22px 0 16px;
  flex-wrap: wrap;
}

.page-about .about-section__index{
  flex: none;
  background: var(--track);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  padding: 4px 13px 4px 9px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 9px) 100%, 0 100%);
}

.page-about .about-section__title{
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(19px, 3.4vw, 27px);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-text{
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 68ch;
}

.page-about .about-text + .about-text{
  margin-top: -4px;
}

.page-about .about-text .mono,
.page-about .scene-card__text .mono,
.page-about .about-versions__text .mono,
.page-about .about-facts__val .mono{
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--text);
}

/* ---------- 场景卡片 ---------- */
.page-about .scene-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 20px;
}

.page-about .scene-card{
  position: relative;
  background: linear-gradient(158deg, var(--panel) 0%, var(--panel-deep) 100%);
  border: 1px solid var(--track);
  clip-path: var(--about-cut);
  padding: 20px 18px 22px;
  transition: border-color var(--ease);
  overflow: hidden;
}

.page-about .scene-card::before{
  content: "";
  position: absolute;
  top: -34px;
  right: -34px;
  width: 96px;
  height: 96px;
  background: radial-gradient(circle, rgba(182, 255, 59, .14), transparent 70%);
  pointer-events: none;
}

.page-about .scene-card:hover,
.page-about .scene-card:focus-within{
  border-color: var(--lime);
}

.page-about .scene-card__num{
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .scene-card__title{
  margin: 10px 0 10px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .scene-card__text{
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .scene-card__text:last-child{
  margin-bottom: 0;
}

/* ---------- 版本刻度 ---------- */
.page-about .about-versions{
  margin-top: 22px;
  min-width: 0;
}

.page-about .about-versions .tabs__list{
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-bottom: 1px solid var(--track);
}

.page-about .about-versions .tabs__tab{
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .08em;
  padding: 14px 6px 11px;
  cursor: pointer;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-versions .tabs__tab:hover{
  color: var(--text);
  border-bottom-color: var(--track);
}

.page-about .about-versions .tabs__tab[aria-selected="true"]{
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-versions .tabs__tab:focus-visible{
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .about-versions__panel{
  padding: 20px 0 0;
  animation: about-fade 120ms linear;
}

.page-about .about-versions__kicker{
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--lime);
}

.page-about .about-versions__text{
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--muted);
  max-width: 68ch;
}

@keyframes about-fade{
  from{ opacity: .4; transform: translateX(6px); }
  to{ opacity: 1; transform: translateX(0); }
}

/* ---------- 双栏错位 ---------- */
.page-about .about-split{
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
  margin-top: 8px;
  min-width: 0;
}

.page-about .about-split__body{
  min-width: 0;
}

.page-about .about-split__media{
  margin: 0;
  clip-path: var(--about-cut);
  min-width: 0;
}

.page-about .about-split__media .media__img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-split__media .media__caption{
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
  padding: 9px 2px 0;
}

/* ---------- 事实列表 ---------- */
.page-about .about-facts{
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid var(--track);
}

.page-about .about-facts__item{
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--track);
}

.page-about .about-facts__key{
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--muted);
  padding-top: 3px;
}

.page-about .about-facts__val{
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

/* ---------- 折叠说明 ---------- */
.page-about .about-fold{
  margin: 20px 0 0;
  border: 1px solid var(--track);
  clip-path: var(--about-cut-sm);
  background: rgba(14, 42, 69, .55);
}

.page-about .about-fold__summary{
  cursor: pointer;
  padding: 13px 16px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 14.5px;
  color: var(--lime);
  list-style: none;
}

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

.page-about .about-fold__summary::before{
  content: "+";
  display: inline-block;
  width: 18px;
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .about-fold[open] .about-fold__summary::before{
  content: "–";
}

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

.page-about .about-fold__body{
  padding: 0 16px 16px;
}

.page-about .about-fold__body p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 数据卡片 ---------- */
.page-about .about-cards{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-card{
  background: linear-gradient(158deg, var(--panel) 0%, var(--panel-deep) 100%);
  border: 1px solid var(--track);
  clip-path: var(--about-cut-sm);
  padding: 16px 15px 18px;
  transition: border-color var(--ease);
}

.page-about .about-card:hover,
.page-about .about-card:focus-within,
.page-about .about-card:focus{
  border-color: var(--lime);
}

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

.page-about .about-card__value{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.8vw, 24px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--lime);
  line-height: 1.2;
}

.page-about .about-card__label{
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--text);
}

.page-about .about-card__note{
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  transition: max-height var(--ease), opacity var(--ease), margin-top var(--ease);
}

.page-about .about-card:hover .about-card__note,
.page-about .about-card:focus-within .about-card__note,
.page-about .about-card:focus .about-card__note{
  max-height: 6em;
  opacity: 1;
  margin-top: 9px;
}

/* ---------- 浅色反色分区 ---------- */
.page-about .about-section--paper{
  border-top: 0;
  padding-top: 0;
  scroll-margin-top: 130px;
}

.page-about .about-paper{
  background: var(--paper);
  color: var(--paper-ink);
  clip-path: var(--about-cut);
  padding: clamp(24px, 4vw, 42px);
}

.page-about .about-paper .about-section__head{
  margin-top: 0;
}

.page-about .about-paper .about-section__index{
  background: var(--paper-ink);
  color: var(--paper);
}

.page-about .about-paper .about-section__title{
  color: var(--paper-ink);
}

.page-about .about-paper__lede{
  margin: 0 0 22px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-muted);
  max-width: 62ch;
}

.page-about .about-paper__list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid rgba(10, 37, 64, .16);
}

.page-about .about-paper__item{
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(10, 37, 64, .16);
}

.page-about .about-paper__mark{
  width: 10px;
  height: 10px;
  margin-top: 6px;
  background: var(--paper-ink);
  transform: rotate(45deg);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.page-about .about-paper__title{
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.45;
  color: var(--paper-ink);
}

.page-about .about-paper__desc{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--paper-muted);
}

/* ---------- 赛季节奏 ---------- */
.page-about .about-season{
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 22px;
}

.page-about .about-season__item{
  position: relative;
  padding: 18px 18px 20px;
  border-left: 2px solid var(--track);
  background: linear-gradient(90deg, rgba(20, 64, 107, .42), transparent 82%);
  transition: border-color var(--ease);
}

.page-about .about-season__item:hover{
  border-left-color: var(--lime);
}

.page-about .about-season__kicker{
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--amber);
}

.page-about .about-season__title{
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-season__text{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta{
  border-top: 1px solid var(--track);
  padding-top: clamp(26px, 4vw, 44px);
}

.page-about .about-cta__inner{
  display: grid;
  gap: 20px;
  border: 1px solid var(--track);
  clip-path: var(--about-cut);
  padding: clamp(22px, 3.6vw, 36px);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(79, 216, 224, .12), transparent 60%),
    linear-gradient(155deg, var(--panel) 0%, var(--panel-deep) 100%);
}

.page-about .about-cta__title{
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3.2vw, 27px);
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-cta__text{
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 56ch;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 480px){
  .page-about .about-nums{
    gap: 14px;
  }
  .page-about .about-cards{
    gap: 14px;
  }
}

@media (min-width: 768px){
  .page-about .about-hero__inner{
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  }
  .page-about .about-nums{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .scene-grid{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-cards{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-season{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-paper__list{
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
  .page-about .about-cta__inner{
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 900px){
  .page-about .about-split{
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
  }
  .page-about .about-split--media-first{
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  }
}

@media (min-width: 1120px){
  .page-about .about-body{
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail{
    position: sticky;
    top: calc(var(--header-top-h) + var(--header-nav-h) + 28px);
    border-top: 1px solid var(--track);
    border-bottom: 0;
    padding: 14px 0 0;
    max-height: calc(100vh - 180px);
    overflow-y: auto;
  }

  .page-about .about-rail__list{
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link{
    display: flex;
    width: 100%;
    gap: 10px;
    border: 0;
    border-left: 2px solid var(--track);
    clip-path: none;
    padding: 11px 0 11px 16px;
    position: relative;
    font-size: 13.5px;
    transition: border-color var(--ease), color var(--ease);
  }

  .page-about .about-rail__link::before{
    content: "";
    position: absolute;
    left: -6px;
    top: 50%;
    width: 8px;
    height: 8px;
    margin-top: -4px;
    background: var(--track);
    transform: rotate(45deg);
    transition: background var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible{
    border-left-color: var(--lime);
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before{
    background: var(--lime);
  }

  .page-about .about-flow{
    padding-left: clamp(0px, 2vw, 20px);
  }

  .page-about .about-section{
    scroll-margin-top: calc(var(--header-top-h) + var(--header-nav-h) + 28px);
  }
}

@media (hover: none){
  .page-about .about-card__note{
    max-height: none;
    opacity: 1;
    margin-top: 9px;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-versions__panel{
    animation: none;
  }
  .page-about .about-card__note,
  .page-about .about-num,
  .page-about .scene-card{
    transition: none;
  }
}