.page-about {
  --about-cut: 18px;
  --about-edge: rgba(216, 210, 196, .2);
  --about-panel: rgba(18, 63, 51, .72);
  --about-shadow: 0 18px 44px rgba(0, 0, 0, .28);
  position: relative;
  background:
    repeating-linear-gradient(90deg, rgba(216, 210, 196, .045) 0 1px, transparent 1px 76px),
    repeating-linear-gradient(0deg, rgba(216, 210, 196, .045) 0 1px, transparent 1px 76px),
    var(--bg);
}

.page-about .about-crumb {
  padding-top: clamp(5.4rem, 12vw, 7.6rem);
  padding-bottom: .4rem;
}

.page-about .about-crumb a {
  color: var(--pitch-bright);
  text-decoration: none;
}

.page-about .about-crumb a:hover {
  color: var(--amber);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .about-hero__title {
  margin: .5rem 0 1.6rem;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.4rem, 9vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -.01em;
  color: var(--fg);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.8rem, 4vw, 3rem);
  grid-template-columns: 1fr;
  align-items: start;
  border-top: 1px solid var(--about-edge);
  padding-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-hero__lede {
  max-width: var(--read);
  color: var(--fg-muted);
}

.page-about .about-hero__lede strong {
  color: var(--amber);
  font-weight: 500;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--about-edge);
  border: 1px solid var(--about-edge);
}

.page-about .about-fact {
  padding: .9rem 1rem 1rem;
  background: var(--bg-sunken);
}

.page-about .about-fact__label {
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--fg-faint);
}

.page-about .about-fact__value {
  margin: .35rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  font-weight: 500;
  color: var(--amber);
}

.page-about .about-fact__value span {
  font-size: .82rem;
  color: var(--fg-muted);
  margin-left: .15rem;
}

/* ---------- 通用分栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.2rem, 3vw, 2rem);
}

.page-about .about-split__aside {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  border-left: 2px solid var(--pitch);
  padding-left: .9rem;
}

.page-about .about-split__tag {
  margin: 0;
  font-size: .82rem;
  letter-spacing: .14em;
  color: var(--fg-faint);
}

.page-about .about-split__body .section-head {
  margin-bottom: 1.2rem;
}

.page-about .about-split__body .prose p:first-child {
  margin-top: 0;
}

.page-about .about-linkrow {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.8rem;
}

/* ---------- 编辑部 ---------- */
.page-about .about-desk__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-desk__text .section-title {
  margin: .5rem 0 1rem;
}

.page-about .about-crew {
  list-style: none;
  margin: 1.8rem 0 0;
  padding: 0;
  border-top: 1px solid var(--about-edge);
}

.page-about .about-crew__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .25rem;
  padding: .95rem 0;
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-crew__key {
  font-size: .82rem;
  letter-spacing: .1em;
  color: var(--fg-faint);
}

.page-about .about-crew__val {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--amber);
}

.page-about .about-crew__note {
  font-size: .9rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

.page-about .about-desk__figure {
  margin: 0;
  border: 1px solid var(--about-edge);
  background: var(--bg-raised);
  box-shadow: var(--about-shadow);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-desk__figure img,
.page-about .about-history__figure img,
.page-about .about-move__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-desk__cap,
.page-about .about-history__cap,
.page-about .about-move__cap {
  padding: .7rem .9rem .85rem;
  font-size: .8rem;
  color: var(--fg-faint);
  border-top: 1px solid var(--about-edge);
}

/* ---------- 简史 ---------- */
.page-about .about-history {
  background: linear-gradient(180deg, transparent, rgba(62, 58, 110, .14) 22%, transparent);
}

.page-about .about-history__head {
  max-width: 62ch;
}

.page-about .about-history__head .section-title {
  margin: .45rem 0 .9rem;
}

.page-about .about-history__figure {
  margin: 2rem 0 clamp(1.8rem, 4vw, 2.6rem);
  border: 1px solid var(--about-edge);
  background: var(--bg-raised);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
}

.page-about .about-history__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 2.6rem);
  align-items: start;
}

.page-about .about-aside {
  border: 1px solid var(--about-edge);
  border-top: 3px solid var(--indigo);
  background: var(--about-panel);
  padding: 1.2rem 1.1rem 1.3rem;
}

.page-about .about-aside__title {
  margin: 0 0 1rem;
  font-size: .82rem;
  letter-spacing: .12em;
  color: var(--fg-faint);
}

.page-about .about-aside__metrics {
  margin: 0;
  display: grid;
  gap: .1rem;
}

.page-about .about-metric {
  padding: .7rem 0;
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-metric:last-child {
  border-bottom: 0;
}

.page-about .about-metric dt {
  font-size: .84rem;
  color: var(--fg-muted);
}

.page-about .about-metric dd {
  margin: .25rem 0 0;
  display: flex;
  align-items: baseline;
  gap: .5rem;
}

.page-about .about-metric .stat__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--amber);
}

.page-about .about-metric .stat__label {
  font-size: .8rem;
  color: var(--fg-faint);
}

.page-about .about-aside__note {
  margin: 1rem 0 0;
  font-size: .86rem;
  line-height: 1.75;
  color: var(--fg-muted);
}

.page-about .about-aside__note a {
  color: var(--pitch-bright);
}

.page-about .about-scrollhint {
  margin: 0 0 .8rem;
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--fg-faint);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 1rem;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(15rem, 78vw);
  gap: 1rem;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  border-bottom: 2px solid var(--about-edge);
}

.page-about .about-timeline__item {
  scroll-snap-align: start;
  position: relative;
  padding: 1.1rem 1rem 1.15rem;
  background: var(--bg-raised);
  border: 1px solid var(--about-edge);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  transition: transform .28s ease, border-color .28s ease, background-color .28s ease;
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 3px;
  height: 0;
  background: var(--pitch);
  transition: height .3s ease;
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-visible {
  transform: translateY(-4px);
  border-color: var(--pitch-bright);
  background: var(--ink-800);
}

.page-about .about-timeline__item:hover::after,
.page-about .about-timeline__item:focus-visible::after,
.page-about .about-timeline__item:focus-within::after {
  height: 100%;
}

.page-about .about-timeline__item:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-about .about-timeline__tick {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--amber);
  border-bottom: 1px dashed rgba(242, 169, 59, .45);
  padding-bottom: .15rem;
}

.page-about .about-timeline__name {
  margin: .65rem 0 .5rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.3;
  color: var(--fg);
}

.page-about .about-timeline__sum {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--fg-muted);
}

.page-about .about-timeline__more {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, margin-top .35s ease;
}

.page-about .about-timeline__more p {
  margin: 0;
  font-size: .86rem;
  line-height: 1.75;
  color: var(--fg-faint);
  border-left: 2px solid var(--pitch);
  padding-left: .7rem;
}

.page-about .about-timeline__item:hover .about-timeline__more,
.page-about .about-timeline__item:focus-visible .about-timeline__more,
.page-about .about-timeline__item:focus-within .about-timeline__more {
  max-height: 12rem;
  margin-top: .85rem;
}

/* ---------- 主场迁移 ---------- */
.page-about .about-move {
  margin-top: clamp(2rem, 5vw, 3rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.4rem, 3.5vw, 2.4rem);
  align-items: center;
}

.page-about .about-move__title {
  margin: 0 0 .9rem;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4.4vw, 2rem);
  font-weight: 400;
  line-height: 1.22;
  color: var(--fg);
}

.page-about .about-move__text p {
  margin: 0 0 .9rem;
  max-width: 46ch;
  color: var(--fg-muted);
  line-height: 1.85;
}

.page-about .about-move__text a {
  color: var(--pitch-bright);
}

.page-about .about-move__figure {
  margin: 0;
  border: 1px solid var(--about-edge);
  border-left: 4px solid var(--indigo);
  background: var(--bg-raised);
}

/* ---------- 协作网络 ---------- */
.page-about .about-network__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.8rem;
}

.page-about .about-netcard {
  padding: 1.3rem 1.15rem 1.4rem;
  background: var(--about-panel);
  border: 1px solid var(--about-edge);
  transition: border-color .25s ease, transform .25s ease;
}

.page-about .about-netcard:hover {
  border-color: var(--pitch-bright);
  transform: translateY(-3px);
}

.page-about .about-netcard h3 {
  margin: .8rem 0 .6rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--fg);
}

.page-about .about-netcard p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.82;
  color: var(--fg-muted);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta__inner {
  border: 1px solid var(--about-edge);
  border-top: 3px solid var(--amber);
  background: linear-gradient(155deg, rgba(242, 169, 59, .1), transparent 58%), var(--bg-raised);
  padding: clamp(1.6rem, 5vw, 2.8rem);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
}

.page-about .about-cta__title {
  margin: 0 0 .9rem;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 5vw, 2.3rem);
  font-weight: 300;
  line-height: 1.2;
  color: var(--fg);
}

.page-about .about-cta__text {
  margin: 0 0 1.5rem;
  max-width: var(--read);
  color: var(--fg-muted);
  line-height: 1.85;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin: 0;
}

/* ---------- 中屏 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-crew__item {
    grid-template-columns: 8.5rem 6rem minmax(0, 1fr);
    align-items: baseline;
    gap: .8rem;
  }

  .page-about .about-network__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-timeline {
    grid-auto-columns: minmax(15rem, 20rem);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: 10rem minmax(0, 1fr);
    gap: clamp(1.6rem, 3vw, 3rem);
  }

  .page-about .about-split__aside {
    flex-direction: column;
    align-items: flex-start;
    border-left: 0;
    border-top: 2px solid var(--pitch);
    padding: .9rem 0 0;
    position: sticky;
    top: 7rem;
  }

  .page-about .about-desk__layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }

  .page-about .about-history__layout {
    grid-template-columns: 17rem minmax(0, 1fr);
    gap: clamp(1.6rem, 3vw, 2.6rem);
  }

  .page-about .about-aside {
    position: sticky;
    top: 7rem;
  }

  .page-about .about-move {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  }

  .page-about .about-network__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: none) {
  .page-about .about-timeline__more {
    max-height: none;
    margin-top: .85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item,
  .page-about .about-netcard,
  .page-about .about-timeline__more {
    transition: none;
  }

  .page-about .about-timeline__item:hover,
  .page-about .about-netcard:hover {
    transform: none;
  }
}