.page-about {
  --about-grid-line: rgba(18, 16, 14, .055);
  --about-veil: rgba(247, 244, 236, .16);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-gold);
  background-image:
    repeating-linear-gradient(0deg, var(--about-grid-line) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(90deg, var(--about-grid-line) 0 1px, transparent 1px 96px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(126deg,
    transparent 59.8%,
    rgba(217, 163, 60, .16) 60%,
    rgba(240, 206, 132, .06) 84%,
    transparent 84.2%);
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  padding-top: 1.5rem;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .05em;
  color: var(--gray);
}

.page-about .breadcrumbs__link {
  color: var(--celadon-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumbs__link:hover {
  border-bottom-color: var(--gold-dark);
}

.page-about .breadcrumbs__sep {
  color: var(--gold-dark);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
  padding: 1.5rem 0 clamp(2.5rem, 6vw, 4rem);
}

.page-about .about-hero__lede h1 {
  margin: .9rem 0 0;
  font-family: var(--head);
  font-weight: 900;
  font-size: clamp(1.95rem, 5.4vw, 3.35rem);
  line-height: 1.1;
  letter-spacing: -.02em;
}

.page-about .about-hero__text {
  max-width: 36em;
  margin-top: 1.1rem;
  color: var(--ink-soft);
  font-size: 1.02rem;
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.7rem;
}

.page-about .about-hero__stats {
  display: grid;
  padding: 1.1rem 1.25rem;
  background: var(--ink);
  border: 1px solid var(--gold-dark);
  border-radius: 2px;
  box-shadow: 8px 8px 0 var(--paper-gray);
}

.page-about .about-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .35rem;
  padding: .85rem 0;
  border-bottom: 1px solid var(--about-veil);
}

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

.page-about .about-stat__num {
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(1.7rem, 4.4vw, 2.25rem);
  line-height: 1;
  color: var(--gold-light);
}

.page-about .about-stat__unit {
  font-family: var(--body);
  font-size: .85rem;
  color: var(--gold);
}

.page-about .about-stat__key {
  flex: 1 0 100%;
  font-family: var(--head);
  font-size: .76rem;
  letter-spacing: .08em;
  color: rgba(247, 244, 236, .74);
}

/* ---------- 区块骨架 ---------- */
.page-about .section {
  padding-block: clamp(2.25rem, 5vw, 3.75rem);
  border-top: 1px solid var(--line);
}

.page-about .section__head {
  margin-bottom: clamp(1.5rem, 3vw, 2.4rem);
  max-width: 44rem;
}

.page-about .section__index {
  display: inline-block;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--gold-dark);
}

.page-about .section__title {
  margin: .4rem 0 0;
  font-family: var(--head);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.8vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -.02em;
}

.page-about .section__lead {
  margin: .7rem 0 0;
  color: var(--gray);
  font-size: .98rem;
  line-height: 1.8;
}

.page-about .about-split {
  display: grid;
  gap: 2rem;
}

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

.page-about .prose {
  max-width: 36em;
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .prose a {
  color: var(--celadon-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .prose a:hover {
  color: var(--gold-dark);
  border-bottom-color: var(--gold-dark);
}

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

/* ---------- 场景清单 ---------- */
.page-about .about-scenes {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: .65rem;
}

.page-about .about-scenes li {
  position: relative;
  padding-left: 1.1rem;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-scenes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: .5rem;
  height: .5rem;
  background: var(--gold);
  border: 1px solid var(--gold-dark);
}

.page-about .about-scenes strong {
  font-family: var(--head);
  font-weight: 700;
  letter-spacing: .01em;
  margin-right: .3rem;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: .5rem;
  bottom: 1.4rem;
  left: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--gold-dark), rgba(165, 118, 31, .12));
}

.page-about .about-stage {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 1.6rem;
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 1.4rem;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  border: 2px solid var(--gold-dark);
  border-radius: 50%;
  background: var(--paper);
  box-shadow: 0 0 0 5px var(--paper);
  transition: background-color .18s ease, border-color .18s ease;
}

.page-about .about-stage:hover::before {
  background: var(--gold);
  border-color: var(--gold-dark);
}

.page-about .about-stage__year {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  margin-bottom: .6rem;
}

.page-about .about-stage__code {
  font-family: var(--head);
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--gold-dark);
}

.page-about .about-stage__years {
  font-family: var(--mono);
  font-size: .95rem;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-stage__card {
  position: relative;
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-about .about-stage__card:hover {
  transform: translateY(-3px);
}

.page-about .about-stage__card .tag {
  display: inline-block;
  margin-bottom: .55rem;
}

.page-about .about-stage__card .card__title {
  margin: 0 0 .5rem;
  font-family: var(--head);
  font-weight: 900;
  font-size: 1.12rem;
  line-height: 1.35;
  letter-spacing: -.01em;
}

.page-about .about-stage__card .card__text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
}

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

.page-about .about-figure--texture {
  margin-top: clamp(2rem, 4vw, 3rem);
}

/* ---------- 网络速览 ---------- */
.page-about .about-chart {
  padding: 1.1rem 1.1rem 1.25rem;
  background: var(--card);
  border: 1px solid var(--line-gold);
  border-radius: 2px;
  box-shadow: 6px 6px 0 var(--paper-gray);
}

.page-about .about-chart__title {
  margin: 0 0 .85rem;
  font-family: var(--head);
  font-weight: 900;
  font-size: .82rem;
  letter-spacing: .1em;
  color: var(--ink);
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-chart__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-chart__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .15rem .6rem;
  padding: .6rem .35rem;
  border-bottom: 1px dashed var(--line);
  transition: background-color .18s ease;
}

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

.page-about .about-chart__row:hover,
.page-about .about-chart__row:focus-visible {
  background: rgba(217, 163, 60, .1);
  outline: none;
}

.page-about .about-chart__row:focus-visible {
  box-shadow: 0 0 0 2px var(--celadon);
}

.page-about .about-chart__key {
  font-family: var(--head);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink-soft);
}

.page-about .about-chart__val {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--gold-dark);
  white-space: nowrap;
}

.page-about .about-chart__unit {
  font-family: var(--body);
  font-size: .72rem;
  font-weight: 400;
  margin-left: .12rem;
  color: var(--gray);
}

.page-about .about-chart__note {
  grid-column: 1 / -1;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--gray);
}

/* ---------- 联系渠道 ---------- */
.page-about .about-channels {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line-gold);
}

.page-about .about-channels li {
  display: grid;
  gap: .15rem .9rem;
  padding: .7rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-channels__key {
  font-family: var(--head);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--gray);
}

.page-about .about-channels__val {
  font-family: var(--mono);
  font-size: .92rem;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-about .about-side-note {
  margin: 1rem 0 0;
  padding-left: .8rem;
  border-left: 3px solid var(--gold);
  font-size: .88rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 资质 ---------- */
.page-about .about-trust__grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-trust__grid .card {
  padding: 1.1rem 1.15rem 1.25rem;
  border: 1px solid var(--line-gold);
  background: var(--card);
  transition: transform .18s ease, box-shadow .18s ease;
}

.page-about .about-trust__grid .card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 22px rgba(18, 16, 14, .1);
}

.page-about .about-trust__grid .tag {
  display: inline-block;
  margin-bottom: .6rem;
}

.page-about .about-trust__grid .card__title {
  margin: 0 0 .45rem;
  font-family: var(--head);
  font-weight: 900;
  font-size: 1rem;
  line-height: 1.4;
  letter-spacing: -.01em;
}

.page-about .about-trust__grid .card__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 收尾行动区 ---------- */
.page-about .about-cta {
  background: var(--ink);
  color: var(--paper);
  border-top: 1px solid var(--gold-dark);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.25rem;
  padding-block: clamp(2rem, 5vw, 3.25rem);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--head);
  font-weight: 900;
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  line-height: 1.3;
  letter-spacing: -.02em;
  color: var(--gold-light);
}

.page-about .about-cta__text {
  margin: .6rem 0 0;
  max-width: 34em;
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(247, 244, 236, .78);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
}

/* ---------- 宽屏 ---------- */
@media (min-width: 860px) {
  .page-about .about-timeline::before {
    left: 7rem;
  }

  .page-about .about-stage {
    display: grid;
    grid-template-columns: 7rem minmax(0, 1fr);
    column-gap: 2.5rem;
    padding-left: 0;
    margin-bottom: 2.1rem;
  }

  .page-about .about-stage::before {
    left: calc(7rem - 5px);
    top: 1.55rem;
  }

  .page-about .about-stage__year {
    flex-direction: column;
    align-items: flex-start;
    gap: .2rem;
    margin-bottom: 0;
    padding-top: .9rem;
  }

  .page-about .about-stage:nth-child(even) .about-stage__card {
    margin-left: 1.75rem;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    gap: 3rem;
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr);
    column-gap: 3rem;
    align-items: start;
  }

  .page-about .about-split__aside {
    position: sticky;
    top: 5.5rem;
  }
}

@media (min-width: 760px) {
  .page-about .about-trust__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-trust__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__stats {
    box-shadow: 5px 5px 0 var(--paper-gray);
  }

  .page-about .about-stage {
    padding-left: 1.6rem;
  }

  .page-about .about-stage::before {
    left: -5px;
  }
}
</main>