.page-about{
  --about-line: 3px solid rgba(201,184,163,.28);
  --about-soft: rgba(244,239,228,.7);
  background: var(--ink);
  color: var(--cream);
}

.page-about .breadcrumb{
  padding: 16px 0 4px;
  font-size: 13px;
}
.page-about .breadcrumb__list{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--mist);
}
.page-about .breadcrumb__list li + li::before{
  content: "/";
  margin-right: 8px;
  color: rgba(143,163,176,.55);
}
.page-about .breadcrumb__list a{
  color: var(--cyan);
  text-decoration: none;
}
.page-about .breadcrumb__list a:hover{
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  padding: 18px 0 38px;
  background:
    radial-gradient(760px 320px at 88% -14%, rgba(139,92,246,.3), transparent 68%),
    linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 82%);
  border-bottom: 3px solid var(--ink-deep);
  overflow: hidden;
}
.page-about .about-hero__grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 24px;
  align-items: center;
}
.page-about .eyebrow{
  display: inline-block;
  margin: 0 0 12px;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--ink-deep);
  background: var(--cyan);
}
.page-about .about-hero h1{
  margin: 0 0 16px;
  font-size: clamp(28px, 6.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--cream);
  text-wrap: balance;
}
.page-about .about-hero__lead{
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: clamp(15px, 2.4vw, 17px);
  line-height: 1.78;
  color: rgba(244,239,228,.82);
}
.page-about .about-hero__actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-hero__figure{
  margin: 0;
  border: 3px solid var(--brown);
  box-shadow: var(--hard-cyan);
  clip-path: polygon(0 0, 100% 3%, 100% 100%, 0 97%);
  overflow: hidden;
  background: var(--ink-deep);
}
.page-about .about-hero__figure img{
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-stats{
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: rgba(201,184,163,.24);
  border: 3px solid rgba(201,184,163,.24);
}
.page-about .about-stats li{
  padding: 14px 14px 16px;
  background: var(--ink-deep);
}
.page-about .about-stats__num{
  display: block;
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1.05;
  color: var(--amber);
  font-weight: 700;
}
.page-about .about-stats__num em{
  font-style: normal;
  font-size: .52em;
  margin-left: 2px;
  color: var(--cream);
}
.page-about .about-stats__label{
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-body{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 24px;
  padding: 30px 0 8px;
}

/* ---------- 目录 ---------- */
.page-about .about-toc__box{
  background: var(--cream);
  border: 3px solid var(--brown);
  box-shadow: var(--hard);
  color: var(--brown);
}
.page-about .about-toc__summary{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  background: var(--amber);
  font-weight: 800;
  font-size: 14px;
}
.page-about .about-toc__summary::-webkit-details-marker{
  display: none;
}
.page-about .about-toc__summary .mono{
  font-size: 12px;
  color: rgba(27,21,17,.72);
}
.page-about .about-toc__list{
  margin: 0;
  padding: 4px 0 8px;
  list-style: none;
}
.page-about .about-toc__list li + li{
  border-top: 1px solid rgba(27,21,17,.14);
}
.page-about .about-toc__list a{
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--brown);
  text-decoration: none;
}
.page-about .about-toc__list a .mono{
  font-size: 12px;
  color: var(--redorange);
}
.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible{
  background: rgba(242,169,59,.26);
  outline: none;
}

/* ---------- 章节堆叠 ---------- */
.page-about .about-chapters{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 22px;
}
.page-about .about-chapter{
  padding: 20px 16px 24px;
  background: var(--cream);
  color: var(--brown);
  border: 3px solid var(--brown);
  box-shadow: var(--hard);
}
.page-about .about-chapter--dark{
  background: var(--ink-deep);
  color: var(--cream);
  border-color: rgba(56,225,214,.4);
  box-shadow: 6px 6px 0 rgba(56,225,214,.16);
}
.page-about .about-chapter--cream-alt{
  background: #EFE7D8;
}

.page-about .about-chapter__head{
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: var(--about-line);
}
.page-about .about-chapter--dark .about-chapter__head{
  border-bottom: 3px solid rgba(201,184,163,.22);
}
.page-about .about-chapter__num{
  flex: 0 0 auto;
  font-size: clamp(34px, 8vw, 58px);
  line-height: .82;
  font-weight: 700;
  color: var(--redorange);
}
.page-about .about-chapter--dark .about-chapter__num{
  color: var(--amber);
}
.page-about .about-chapter__kicker{
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(27,21,17,.6);
}
.page-about .about-chapter--dark .about-chapter__kicker{
  color: var(--cyan);
}
.page-about .about-chapter h2{
  margin: 0;
  font-size: clamp(20px, 3.6vw, 28px);
  line-height: 1.28;
  letter-spacing: -.01em;
  font-weight: 800;
}
.page-about .about-chapter__lead{
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.78;
}
.page-about .about-chapter__lead + .about-chapter__lead{
  margin-top: -4px;
}
.page-about .about-chapter--dark .about-chapter__lead{
  color: rgba(244,239,228,.84);
}

/* ---------- 要点 ---------- */
.page-about .about-points{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-points li{
  padding: 12px 14px;
  background: rgba(255,255,255,.5);
  border-left: 5px solid var(--redorange);
}
.page-about .about-points h3{
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
}
.page-about .about-points p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(27,21,17,.84);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 20px;
}
.page-about .about-timeline{
  margin: 0;
  padding: 0 0 0 4px;
  list-style: none;
}
.page-about .about-timeline__item{
  position: relative;
  padding: 0 0 22px 22px;
  border-left: 3px solid rgba(56,225,214,.42);
}
.page-about .about-timeline__item:last-child{
  padding-bottom: 4px;
}
.page-about .about-timeline__item::before{
  content: "";
  position: absolute;
  left: -9px;
  top: 3px;
  width: 12px;
  height: 12px;
  background: var(--amber);
  border: 3px solid var(--ink-deep);
  box-shadow: 0 0 0 2px rgba(242,169,59,.4);
}
.page-about .about-timeline__year{
  display: inline-block;
  margin-bottom: 4px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--cyan);
}
.page-about .about-timeline__item h3{
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 800;
  color: var(--cream);
}
.page-about .about-timeline__item p{
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(244,239,228,.78);
}

.page-about .about-figure{
  margin: 0;
  border: 3px solid var(--brown);
  box-shadow: var(--hard-amber);
  background: var(--ink-deep);
  overflow: hidden;
}
.page-about .about-figure img{
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-figure figcaption{
  padding: 10px 12px 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
  background: var(--ink-deep);
  border-top: 1px solid rgba(201,184,163,.2);
}
.page-about .about-figure--timeline{
  box-shadow: 6px 6px 0 rgba(139,92,246,.24);
}
.page-about .about-figure--team{
  margin-top: 18px;
  box-shadow: var(--hard);
}
.page-about .about-figure--team figcaption{
  background: rgba(27,21,17,.06);
  color: rgba(27,21,17,.72);
  border-top: 1px solid rgba(27,21,17,.16);
}

/* ---------- 栏目标签与节奏 ---------- */
.page-about .about-tags{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}
.page-about .about-tags .tag{
  padding: 5px 11px;
  font-size: 12.5px;
  font-weight: 700;
  border: 2px solid rgba(27,21,17,.32);
  background: transparent;
  color: var(--brown);
}
.page-about .about-tags .tag--amber{
  border-color: var(--amber);
  background: rgba(242,169,59,.28);
}
.page-about .about-tags .tag--cyan{
  border-color: rgba(56,225,214,.85);
  background: rgba(56,225,214,.18);
}
.page-about .about-tags .tag--violet{
  border-color: var(--violet);
  background: rgba(139,92,246,.18);
}
.page-about .about-tags .tag--red{
  border-color: var(--redorange);
  background: rgba(232,93,63,.18);
}

.page-about .about-cadence{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-cadence li{
  padding: 12px 14px;
  background: var(--ink-deep);
  color: var(--cream);
  border-left: 5px solid var(--cyan);
}
.page-about .about-cadence li:nth-child(2){
  border-left-color: var(--amber);
}
.page-about .about-cadence li:nth-child(3){
  border-left-color: var(--violet);
}
.page-about .about-cadence .mono{
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
}
.page-about .about-cadence li:nth-child(2) .mono{
  color: var(--amber);
}
.page-about .about-cadence li:nth-child(3) .mono{
  color: #B79BFB;
}
.page-about .about-cadence p{
  margin: 0;
  font-size: 14px;
  line-height: 1.66;
  color: rgba(244,239,228,.8);
}

/* ---------- 团队 ---------- */
.page-about .about-team{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 14px;
}
.page-about .about-team__card{
  position: relative;
  padding: 16px 14px 14px;
  background: var(--cream);
  border: 3px solid var(--brown);
  box-shadow: 4px 4px 0 rgba(27,21,17,.85);
  transition: box-shadow .18s ease, transform .18s ease, border-color .18s ease;
}
.page-about .about-team__card:hover,
.page-about .about-team__card:focus-visible{
  border-color: var(--redorange);
  box-shadow: 7px 7px 0 rgba(232,93,63,.45);
  outline: none;
}
.page-about .about-team__num{
  display: block;
  font-size: 38px;
  line-height: 1;
  font-weight: 700;
  color: var(--redorange);
}
.page-about .about-team__card h3{
  margin: 6px 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--brown);
}
.page-about .about-team__card p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(27,21,17,.82);
}
.page-about .about-team__tags{
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  opacity: .68;
  transition: opacity .18s ease;
}
.page-about .about-team__card:hover .about-team__tags,
.page-about .about-team__card:focus-visible .about-team__tags{
  opacity: 1;
}
.page-about .about-team__tags li{
  padding: 3px 9px;
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-deep);
  background: rgba(56,225,214,.4);
  border: 1.5px solid rgba(27,21,17,.28);
}

/* ---------- 凭据 ---------- */
.page-about .about-facts{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 1px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  background: rgba(201,184,163,.22);
  border: 3px solid rgba(201,184,163,.22);
}
.page-about .about-facts li{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 13px;
  font-size: 13.5px;
  color: var(--cream);
  background: var(--ink);
}
.page-about .about-facts .mono{
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .about-next{
  padding: 20px 16px 22px;
  background:
    linear-gradient(135deg, rgba(56,225,214,.16), rgba(139,92,246,.2) 70%),
    var(--ink-deep);
  border: 3px solid rgba(56,225,214,.45);
  box-shadow: 6px 6px 0 rgba(139,92,246,.2);
}
.page-about .about-next h2{
  margin: 0 0 14px;
  font-size: clamp(19px, 3.2vw, 24px);
  font-weight: 800;
  color: var(--cream);
}
.page-about .about-next__grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 10px;
}
.page-about .about-next__card{
  display: block;
  padding: 14px;
  text-decoration: none;
  color: var(--cream);
  background: rgba(7,17,28,.72);
  border: 2px solid rgba(201,184,163,.3);
  transition: border-color .18s ease, background .18s ease;
}
.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible{
  border-color: var(--cyan);
  background: rgba(56,225,214,.12);
  outline: none;
}
.page-about .about-next__card .mono{
  font-size: 12px;
  color: var(--amber);
}
.page-about .about-next__card h3{
  margin: 6px 0 6px;
  font-size: 16px;
  font-weight: 800;
}
.page-about .about-next__card p{
  margin: 0;
  font-size: 13.8px;
  line-height: 1.68;
  color: rgba(244,239,228,.78);
}
.page-about .about-next__foot{
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(244,239,228,.76);
}
.page-about .about-next__foot a{
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 2px solid rgba(56,225,214,.55);
}
.page-about .about-next__foot a:hover{
  border-bottom-color: var(--amber);
}

/* ---------- 回到顶部 ---------- */
.page-about .about-totop__wrap{
  padding: 26px 0 40px;
  display: flex;
  justify-content: flex-end;
}
.page-about .about-totop{
  display: inline-block;
  padding: 9px 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  text-decoration: none;
  color: var(--ink-deep);
  background: var(--cyan);
  border: 3px solid var(--brown);
  box-shadow: 4px 4px 0 rgba(7,17,28,.9);
}
.page-about .about-totop:hover,
.page-about .about-totop:focus-visible{
  background: var(--amber);
  outline: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px){
  .page-about .about-chapter{
    padding: 24px 24px 28px;
  }
  .page-about .about-points{
    grid-template-columns: repeat(2, minmax(0,1fr));
  }
  .page-about .about-points li:first-child{
    grid-column: 1 / -1;
  }
  .page-about .about-cadence{
    grid-template-columns: repeat(3, minmax(0,1fr));
  }
  .page-about .about-team{
    grid-template-columns: repeat(3, minmax(0,1fr));
  }
  .page-about .about-facts{
    grid-template-columns: repeat(2, minmax(0,1fr));
  }
  .page-about .about-next__grid{
    grid-template-columns: repeat(3, minmax(0,1fr));
  }
  .page-about .about-stats{
    grid-template-columns: repeat(4, minmax(0,1fr));
  }
}

@media (min-width: 940px){
  .page-about .about-hero{
    padding: 26px 0 46px;
  }
  .page-about .about-hero__grid{
    grid-template-columns: minmax(0,1.08fr) minmax(0,.92fr);
    gap: 36px;
  }
  .page-about .about-body{
    grid-template-columns: 236px minmax(0,1fr);
    gap: 34px;
    padding-top: 38px;
  }
  .page-about .about-toc{
    position: sticky;
    top: 18px;
  }
  .page-about .about-chapters{
    gap: 28px;
  }
  .page-about .about-chapter{
    padding: 28px 30px 32px;
  }
  .page-about .about-timeline__grid{
    grid-template-columns: minmax(0,1.05fr) minmax(0,.95fr);
    gap: 28px;
    align-items: start;
  }
  .page-about .about-points{
    grid-template-columns: repeat(3, minmax(0,1fr));
  }
  .page-about .about-points li:first-child{
    grid-column: auto;
  }
  .page-about .about-facts{
    grid-template-columns: repeat(3, minmax(0,1fr));
  }
  .page-about .about-next{
    padding: 26px 30px 28px;
  }
  .page-about .about-totop__wrap{
    padding-bottom: 54px;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-team__card,
  .page-about .about-team__tags,
  .page-about .about-next__card{
    transition: none;
  }
}
<<<END>>>