.page-about{
  --about-gap: 44px;
  --about-radius: 16px;
  display: grid;
  gap: var(--about-gap);
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 20px 16px 72px;
  color: var(--bone);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .crumbs{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  font-size: 13px;
  color: var(--rock);
}
.page-about .crumbs a{
  color: var(--rock);
  text-decoration: none;
}
.page-about .crumbs a:hover{
  color: var(--cyan);
}
.page-about .crumbs [aria-current="page"]{
  color: var(--bone);
}

/* ---------- 首屏面板 ---------- */
.page-about .hist-hero{
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--ink-700);
  box-shadow: var(--shadow-panel);
  padding: 26px 18px 22px;
}
.page-about .hist-hero__media{
  position: absolute;
  inset: 0;
  z-index: -1;
}
.page-about .hist-hero__media img{
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  opacity: 0.34;
  filter: saturate(0.7) contrast(1.08);
}
.page-about .hist-hero__media::after{
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(155deg, rgba(11,16,32,0.94) 0%, rgba(11,16,32,0.72) 46%, rgba(53,242,214,0.12) 100%);
}
.page-about .hist-hero::after{
  content: "";
  position: absolute;
  left: -12%;
  right: -12%;
  bottom: -34px;
  height: 88px;
  transform: rotate(-4deg);
  background: linear-gradient(90deg, rgba(53,242,214,0.20), rgba(255,122,41,0.12) 58%, rgba(255,61,127,0.10));
  pointer-events: none;
  z-index: 0;
}
.page-about .hist-hero__grid{
  position: relative;
  z-index: 1;
  display: grid;
  gap: 22px;
}
.page-about .hist-hero__title{
  margin: 10px 0 0;
  font-size: clamp(26px, 6.4vw, 40px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-align: left;
  color: var(--bone);
}
.page-about .hist-hero__lede{
  margin: 14px 0 0;
  max-width: 60ch;
  color: rgba(242,239,230,0.88);
  font-size: 16px;
  line-height: 1.78;
}
.page-about .hist-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.page-about .hist-hero__stats{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.page-about .hist-hero__stats .stat{
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--glass);
  backdrop-filter: blur(6px);
}
.page-about .hist-hero__stats .stat__value{
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  line-height: 1.3;
}
.page-about .hist-hero__stats .stat__label{
  font-size: 12px;
  color: var(--rock);
  letter-spacing: 0.06em;
}

/* ---------- 页内章节目录 ---------- */
.page-about .hist-toc{
  padding: 16px 16px 18px;
  border-radius: 14px;
}
.page-about .hist-toc__title{
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--rock);
  text-transform: uppercase;
}
.page-about .hist-toc__list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}
.page-about .hist-toc__link{
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--bone);
  font-size: 14px;
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}
.page-about .hist-toc__link:hover{
  border-color: var(--line-cyan);
  background: rgba(53,242,214,0.06);
  color: var(--cyan);
}
.page-about .hist-toc__link[aria-current="true"]{
  border-color: var(--line-cyan);
  color: var(--cyan);
}
.page-about .hist-toc__idx{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--rock);
  letter-spacing: 0.08em;
}

/* ---------- 章节面板 ---------- */
.page-about .chapter{
  position: relative;
  padding: 22px 18px 24px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--ink-700);
  box-shadow: var(--shadow-panel);
}
.page-about .chapter::before{
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(53,242,214,0));
}
.page-about .chapter--plain{
  background: var(--ink-800);
}
.page-about .chapter__head{
  margin-bottom: 18px;
}
.page-about .chapter__title{
  margin: 4px 0 0;
  font-size: clamp(21px, 4.6vw, 26px);
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.005em;
}
.page-about .chapter__sub{
  margin: 6px 0 0;
  color: var(--rock);
  font-size: 13px;
}
.page-about .chapter p{
  margin: 0 0 14px;
  max-width: 72ch;
  line-height: 1.78;
}
.page-about .chapter p:last-child{
  margin-bottom: 0;
}
.page-about .chapter a{
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}
.page-about .chapter a:hover{
  color: var(--orange);
  border-bottom-color: var(--line-warm);
}

.page-about .hist-leadin{
  color: rgba(242,239,230,0.9);
  margin-bottom: 18px;
}
.page-about .hist-note{
  margin-top: 18px;
  padding: 12px 14px;
  border-left: 3px solid var(--clay);
  background: rgba(200,113,79,0.08);
  border-radius: 0 10px 10px 0;
  font-size: 14px;
  color: var(--rock);
}

/* ---------- 两栏图文 ---------- */
.page-about .hist-cols{
  display: grid;
  gap: 20px;
}
.page-about .hist-cols__main p{
  margin: 0 0 14px;
}
.page-about .hist-cols__main p:last-child{
  margin-bottom: 0;
}
.page-about .hist-figure{
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--ink-800);
}
.page-about .hist-figure img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: brightness(0.74) saturate(0.85);
}
.page-about .hist-figure::after{
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11,16,32,0.08), rgba(11,16,32,0.58));
  pointer-events: none;
}
.page-about .hist-figure figcaption{
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--rock);
  background: linear-gradient(180deg, rgba(5,7,15,0), rgba(5,7,15,0.88));
}

/* ---------- 赛事层级列表 ---------- */
.page-about .tiers{
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .tiers__row{
  display: grid;
  gap: 8px;
  padding: 12px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  background: rgba(11,16,32,0.42);
}
.page-about .tiers__row .tag{
  justify-self: start;
}
.page-about .tiers__text{
  margin: 0;
  font-size: 14px;
  color: rgba(242,239,230,0.86);
  line-height: 1.72;
}

/* ---------- 版本时间轴 ---------- */
.page-about .timeline{
  position: relative;
  list-style: none;
  margin: 6px 0 0;
  padding: 0 0 0 26px;
}
.page-about .timeline::before{
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--orange) 58%, var(--magenta));
  opacity: 0.5;
}
.page-about .tl-item{
  position: relative;
  padding-bottom: 16px;
}
.page-about .tl-item:last-child{
  padding-bottom: 0;
}
.page-about .tl-item::before{
  content: "";
  position: absolute;
  left: -26px;
  top: 16px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-700);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53,242,214,0.10);
}
.page-about .tl-item--hot::before{
  border-color: var(--magenta);
  box-shadow: 0 0 0 4px rgba(255,61,127,0.16);
}
.page-about .tl-card{
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(11,16,32,0.55);
  overflow: hidden;
  transition: border-color 200ms var(--ease);
}
.page-about .tl-card:hover{
  border-color: var(--line-cyan);
}
.page-about .tl-card > summary{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}
.page-about .tl-card > summary::-webkit-details-marker{
  display: none;
}
.page-about .tl-card > summary::after{
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}
.page-about .tl-card[open] > summary::after{
  content: "收起";
  color: var(--cyan);
}
.page-about .tl-card__title{
  flex: 1 1 180px;
  font-size: 16px;
  font-weight: 700;
  color: var(--bone);
  line-height: 1.5;
}
.page-about .tl-card__meta{
  flex: 1 1 100%;
  font-size: 12px;
  color: var(--rock);
}
.page-about .tl-card__body{
  padding: 14px 16px 16px;
  border-top: 1px solid var(--line-soft);
}
.page-about .tl-card__body p{
  margin: 0 0 10px;
  font-size: 15px;
  color: rgba(242,239,230,0.86);
}
.page-about .tl-card__body p:last-child{
  margin-bottom: 0;
}
.page-about .ver-badge{
  display: inline-flex;
  align-items: center;
  padding: 3px 8px;
  border: 1px solid var(--line-cyan);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .year-block{
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 4px;
  background: var(--clay);
  color: #14080b;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

/* ---------- 字段表 ---------- */
.page-about .fieldsheet{
  display: grid;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: rgba(11,16,32,0.55);
}
.page-about .fieldrow{
  display: grid;
  gap: 4px;
  padding: 12px 16px;
  border-top: 1px solid var(--line-soft);
  transition: background-color 160ms var(--ease);
}
.page-about .fieldrow:first-child{
  border-top: 0;
}
.page-about .fieldrow:hover{
  background: rgba(53,242,214,0.05);
}
.page-about .fieldrow__name{
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}
.page-about .fieldrow__desc{
  font-size: 14px;
  color: rgba(242,239,230,0.84);
  line-height: 1.7;
}
.page-about .versheet{
  margin-top: 16px;
  padding: 14px 16px;
  border-left: 3px solid var(--orange);
  border-radius: 0 12px 12px 0;
  background: rgba(255,122,41,0.07);
}
.page-about .versheet__title{
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.02em;
}
.page-about .versheet p{
  margin: 0;
  font-size: 14px;
  color: rgba(242,239,230,0.86);
}

/* ---------- 校对卡片 ---------- */
.page-about .checkgrid{
  display: grid;
  gap: 10px;
}
.page-about .checkcard{
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--line-cyan);
  border-radius: 12px;
  background: rgba(11,16,32,0.48);
}
.page-about .checkcard__idx{
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orange);
  margin-bottom: 6px;
}
.page-about .checkcard__title{
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
}
.page-about .checkcard__text{
  margin: 0;
  font-size: 14px;
  color: rgba(242,239,230,0.84);
  line-height: 1.72;
}
.page-about .staffline{
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}
.page-about .staffline p{
  font-size: 14px;
  color: var(--rock);
  margin: 0 0 10px;
}
.page-about .staffline p:last-child{
  margin-bottom: 0;
}

/* ---------- 站点信息 ---------- */
.page-about .siteinfo{
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--line-soft);
  margin-bottom: 16px;
}
.page-about .siteinfo__row{
  display: grid;
  gap: 4px;
  padding: 12px 16px;
  background: rgba(11,16,32,0.6);
}
.page-about .siteinfo__key{
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--rock);
}
.page-about .siteinfo__val{
  font-size: 15px;
  color: var(--bone);
}
.page-about .siteinfo__val.num{
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

/* ---------- 页尾窄条 ---------- */
.page-about .hist-next{
  display: grid;
  gap: 14px;
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(100deg, rgba(30,42,71,0.72), rgba(11,16,32,0.72));
}
.page-about .hist-next__title{
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.page-about .hist-next__text .meta{
  margin: 0;
  font-size: 13px;
  color: var(--rock);
  line-height: 1.7;
}
.page-about .hist-next__links{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px){
  .page-about{
    padding: 28px 24px 88px;
    --about-gap: 52px;
  }
  .page-about .hist-toc__list{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .tiers__row{
    grid-template-columns: 92px 1fr;
    align-items: start;
    gap: 14px;
  }
  .page-about .checkgrid{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .fieldrow{
    grid-template-columns: 150px 1fr;
    gap: 18px;
    align-items: baseline;
  }
  .page-about .fieldrow__name{
    text-align: right;
  }
  .page-about .siteinfo__row{
    grid-template-columns: 160px 1fr;
    gap: 18px;
    align-items: baseline;
  }
  .page-about .siteinfo__key{
    text-align: right;
  }
  .page-about .hist-next{
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 20px;
  }
}

@media (min-width: 900px){
  .page-about{
    padding: 36px 32px 104px;
    --about-gap: 64px;
  }
  .page-about .hist-hero{
    padding: 40px 40px 36px;
  }
  .page-about .hist-hero__grid{
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
    gap: 40px;
  }
  .page-about .hist-hero__stats{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .hist-toc__list{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .chapter{
    padding: 30px 34px 34px;
  }
  .page-about .chapter__head{
    margin-bottom: 22px;
  }
  .page-about .hist-cols{
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 32px;
    align-items: start;
  }
  .page-about .timeline{
    padding-left: 34px;
  }
  .page-about .tl-item::before{
    left: -34px;
  }
  .page-about .tl-card__meta{
    flex: 0 1 auto;
    margin-left: 4px;
  }
  .page-about .tl-card > summary::after{
    margin-left: 12px;
  }
  .page-about .checkgrid{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .hist-next{
    padding: 22px 28px;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .hist-toc__link,
  .page-about .tl-card,
  .page-about .fieldrow{
    transition: none;
  }
}