.page-about{
  background:
    linear-gradient(180deg, rgba(56,224,176,.055) 0, rgba(7,28,22,0) 400px),
    var(--pitch);
  color: var(--mist);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: hidden;
}

.page-about img{
  max-width: 100%;
  height: auto;
  display: block;
}

/* 面包屑 */
.page-about .breadcrumbs{
  padding-block: 16px 4px;
}
.page-about .breadcrumbs-list{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cool);
}
.page-about .breadcrumbs-list li + li::before{
  content: "/";
  padding: 0 8px;
  color: var(--grid);
}
.page-about .breadcrumbs-list a{
  color: var(--cool);
  text-decoration: none;
  transition: color var(--ease);
}
.page-about .breadcrumbs-list a:hover,
.page-about .breadcrumbs-list a:focus-visible{
  color: var(--lime);
}
.page-about .breadcrumbs-current{
  color: var(--mist);
}

/* 首屏 */
.page-about .about-hero{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 38px);
  padding-block: clamp(18px, 3vw, 30px) clamp(30px, 5vw, 50px);
}
.page-about .hero-copy{
  min-width: 0;
}
.page-about .eyebrow{
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--lime);
}
.page-about h1{
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.6vw, 64px);
  line-height: 1.03;
  letter-spacing: -.03em;
  color: var(--mist);
  text-wrap: balance;
}
.page-about .lede{
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.9vw, 19px);
  line-height: 1.75;
  color: var(--mist);
}
.page-about .prose{
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--cool);
}
.page-about .hero-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .hero-figure{
  margin: 0;
  min-width: 0;
}
.page-about .hero-figure .media-frame{
  aspect-ratio: 4 / 3;
  border: 1px solid var(--grid);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--pitch-2);
  box-shadow: 0 26px 60px -36px rgba(200,255,61,.7);
}
.page-about .hero-figure .media-frame img{
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .media-caption{
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--cool);
}

/* 章节索引带 */
.page-about .about-index{
  padding-top: 6px;
}
.page-about .index-list{
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 12px 0;
  list-style: none;
  overflow-x: auto;
  border-top: 1px solid var(--grid);
  scrollbar-width: thin;
}
.page-about .index-list li{
  flex: 0 0 auto;
}
.page-about .index-list a{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--grid);
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--cool);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
}
.page-about .index-list .mono{
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--cyan);
  transition: color var(--ease);
}
.page-about .index-list a:hover,
.page-about .index-list a:focus-visible{
  color: var(--ink-on-lime);
  background: var(--lime);
  border-color: var(--lime);
}
.page-about .index-list a:hover .mono,
.page-about .index-list a:focus-visible .mono{
  color: var(--ink-on-lime);
}

/* 章节骨架 */
.page-about .chapter{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding-block: clamp(34px, 5.5vw, 62px);
  border-top: 1px solid var(--grid);
  scroll-margin-top: calc(var(--header-h) + 20px);
}
.page-about .chapter-rail{
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
}
.page-about .chapter-no{
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(32px, 6vw, 46px);
  line-height: .9;
  letter-spacing: -.02em;
  color: var(--lime);
}
.page-about .chapter-kicker{
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--cool);
}
.page-about .chapter-body{
  min-width: 0;
}
.page-about .chapter-body .section-title{
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.4vw, 40px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--mist);
  text-wrap: balance;
}
.page-about .chapter-body .prose:first-of-type{
  margin-top: 0;
}
.page-about .chapter-links{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

/* 版本年表 */
.page-about .timeline{
  position: relative;
  margin: 26px 0 0;
  padding: 0 0 0 28px;
  list-style: none;
}
.page-about .timeline::before{
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--lime), var(--cyan) 58%, var(--grid));
}
.page-about .tl-item{
  position: relative;
  padding-bottom: 26px;
}
.page-about .tl-item:last-child{
  padding-bottom: 0;
}
.page-about .tl-item::before{
  content: "";
  position: absolute;
  left: -28px;
  top: 3px;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: var(--pitch);
  border: 2px solid var(--cyan);
  transition: background var(--ease), border-color var(--ease);
}
.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before{
  background: var(--lime);
  border-color: var(--lime);
}
.page-about .tl-year{
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--lime);
}
.page-about .tl-content h3{
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--mist);
}
.page-about .tl-content p{
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--cool);
}

/* 引用块 */
.page-about .pullquote{
  margin: 28px 0 0;
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--lime);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.3vw, 23px);
  line-height: 1.55;
  color: var(--mist);
}

/* 覆盖规模 */
.page-about .stat-grid{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 24px;
}
.page-about .stat{
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px 18px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-sm);
  background: linear-gradient(165deg, rgba(13,43,34,.92), rgba(5,10,8,.55));
  transition: border-color var(--ease), transform var(--ease);
}
.page-about .stat:hover{
  border-color: var(--lime);
  transform: translateY(-3px);
}
.page-about .stat-num{
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4.6vw, 36px);
  line-height: 1;
  color: var(--lime);
}
.page-about .stat-num em{
  margin-left: 4px;
  font-style: normal;
  font-size: .48em;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}
.page-about .stat-label{
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--cool);
}

/* 配图 */
.page-about .about-figure{
  margin: 26px 0 0;
}
.page-about .about-figure .media-frame{
  aspect-ratio: 3 / 2;
  border: 1px solid var(--grid);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--pitch-2);
}
.page-about .about-figure .media-frame img{
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 团队 */
.page-about .team-list{
  display: grid;
  gap: 0;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .team-item{
  display: grid;
  gap: 5px;
  padding: 14px 0;
  border-top: 1px solid var(--grid);
}
.page-about .team-item:last-child{
  border-bottom: 1px solid var(--grid);
}
.page-about .team-name{
  margin: 0;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--lime);
}
.page-about .team-desc{
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--cool);
}

/* 联络面板 */
.page-about .venue-panel{
  margin-top: 24px;
  padding: 16px 18px 10px;
  border: 1px solid var(--grid);
  border-radius: var(--radius-sm);
  background: linear-gradient(170deg, rgba(13,43,34,.9), rgba(5,10,8,.55));
}
.page-about .venue-panel .contact-row{
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 12px 0;
  border-top: 1px solid var(--grid);
}
.page-about .venue-panel .contact-row:first-child{
  border-top: 0;
  padding-top: 4px;
}
.page-about .contact-label{
  flex: 0 0 82px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--cool);
}
.page-about .contact-value{
  min-width: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}
.page-about .copy-btn{
  padding: 6px 12px;
  border: 1px solid var(--grid);
  border-radius: 999px;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--cool);
  cursor: pointer;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
}
.page-about .copy-btn:hover,
.page-about .copy-btn:focus-visible{
  color: var(--ink-on-lime);
  background: var(--lime);
  border-color: var(--lime);
}
.page-about .copy-btn[data-copied]{
  color: var(--ink-on-lime);
  background: var(--cyan);
  border-color: var(--cyan);
}

@media (min-width: 720px){
  .page-about .stat-grid{
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }
  .page-about .chapter-rail{
    align-items: center;
  }
}

@media (min-width: 960px){
  .page-about .about-hero{
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: start;
    gap: clamp(30px, 5vw, 68px);
  }
  .page-about .about-hero .hero-figure{
    margin-top: 8px;
  }
  .page-about .chapter{
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }
  .page-about .chapter-rail{
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
  }
  .page-about .chapter-no{
    font-size: clamp(46px, 4.6vw, 72px);
  }
  .page-about .venue-panel{
    padding: 18px 22px 12px;
  }
  .page-about .about-figure{
    margin-top: 30px;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about *{
    transition: none !important;
  }
  .page-about .stat:hover{
    transform: none;
  }
}