.page-about {
  background: var(--ink);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: calc(var(--header-h) + 48px);
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 28px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 32px;
  padding-bottom: 44px;
}

.page-about .about-hero__main .eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding-left: 12px;
  border-left: 3px solid var(--saffron);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 10vw, 5.2rem);
  font-weight: 800;
  line-height: 0.96;
  letter-spacing: 0.02em;
  color: var(--cream);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 48ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-facts {
  margin: 0;
  border-top: 1px solid var(--hair);
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-facts dt {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-about .about-facts dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--gold);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border-top: 1px solid var(--hair);
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  opacity: 0.78;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(19, 15, 20, 0.62) 0%, rgba(19, 15, 20, 0) 42%, rgba(19, 15, 20, 0.9) 100%);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  border-bottom: 1px solid var(--hair-soft);
  background: linear-gradient(180deg, rgba(27, 42, 74, 0.5), rgba(19, 15, 20, 0));
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list li {
  display: flex;
}

.page-about .about-index__list li + li {
  border-left: 1px solid var(--hair-soft);
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 14px 16px;
  font-size: 0.875rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-index__link .mono {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--gold-bright);
  background-color: rgba(158, 43, 37, 0.22);
}

/* ---------- 长卷章节 ---------- */
.page-about .about-chapter {
  padding: clamp(56px, 9vw, 112px) 0;
  border-bottom: 1px solid var(--hair-soft);
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: 22px;
}

.page-about .about-chapter__axis {
  position: relative;
  padding-left: 16px;
}

.page-about .about-chapter__axis::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: -20px;
  width: 2px;
  background: linear-gradient(180deg, var(--saffron) 0%, rgba(158, 43, 37, 0) 100%);
}

.page-about .about-chapter__no {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--gold);
}

.page-about .about-chapter__note {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.page-about .about-chapter__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  font-weight: 700;
  line-height: 1.22;
  color: var(--cream);
}

.page-about .about-chapter__body p {
  margin: 0 0 16px;
  max-width: 62ch;
  line-height: 1.85;
}

.page-about .about-chapter__body > p:last-of-type {
  margin-bottom: 0;
}

/* ---------- 读者场景清单 ---------- */
.page-about .about-points {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--hair);
}

.page-about .about-points li {
  position: relative;
  padding: 14px 0 14px 22px;
  border-bottom: 1px solid var(--hair-soft);
  line-height: 1.78;
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 25px;
  width: 10px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-points strong {
  color: var(--cream);
  font-weight: 600;
}

/* ---------- 里程碑时间线 ---------- */
.page-about .ms-list {
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ms {
  position: relative;
  display: grid;
  gap: 8px;
  padding: 22px 0 22px 24px;
  border-left: 1px solid var(--hair);
  transition: border-left-color 0.2s var(--ease);
}

.page-about .ms:hover {
  border-left-color: var(--gold);
}

.page-about .ms::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 30px;
  width: 7px;
  height: 7px;
  background: var(--saffron);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .ms__year {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .ms__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--cream);
}

.page-about .ms__body p {
  margin: 0;
  max-width: 58ch;
  line-height: 1.8;
}

.page-about .about-figure {
  margin: 40px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--hair-soft);
}

.page-about .about-figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--text-dim);
}

/* ---------- 团队分工 ---------- */
.page-about .team-list {
  margin: 32px 0 0;
  border-top: 1px solid var(--hair);
}

.page-about .team {
  display: grid;
  gap: 6px;
  padding: 24px 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .team__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .team__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--cream);
}

.page-about .team__text {
  margin: 0;
  max-width: 58ch;
  line-height: 1.8;
}

/* ---------- 合作网络 ---------- */
.page-about .about-net {
  display: grid;
  gap: 32px;
  margin-top: 32px;
}

.page-about .net-item {
  border-top: 1px solid var(--hair-soft);
}

.page-about .net-item:last-of-type {
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .net-item__sum {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--cream);
  cursor: pointer;
  list-style: none;
  transition: color 0.2s var(--ease);
}

.page-about .net-item__sum::-webkit-details-marker {
  display: none;
}

.page-about .net-item__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--gold);
}

.page-about .net-item[open] .net-item__sum::after {
  content: "−";
}

.page-about .net-item__sum:hover,
.page-about .net-item__sum:focus-visible {
  color: var(--gold-bright);
}

.page-about .net-item__sum .mono {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .net-item p {
  margin: 0 0 18px;
  padding-right: 8px;
  max-width: 58ch;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-net__figure {
  margin: 0;
}

.page-about .about-net__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--hair-soft);
}

/* ---------- 地区与备案 ---------- */
.page-about .about-region__card {
  margin-top: 28px;
  padding: 8px 20px;
  border: 1px solid var(--hair);
  border-left: 3px solid var(--saffron);
  background: linear-gradient(135deg, rgba(27, 42, 74, 0.55), rgba(19, 15, 20, 0) 78%);
}

.page-about .about-region__row {
  display: grid;
  gap: 2px;
  padding: 13px 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .about-region__row:last-child {
  border-bottom: none;
}

.page-about .about-region__key {
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
}

.page-about .about-region__val {
  color: var(--cream);
  line-height: 1.6;
  word-break: break-word;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .about-cta__panel {
  display: grid;
  gap: 26px;
  padding-top: 32px;
  border-top: 2px solid var(--saffron);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--cream);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 60ch;
  line-height: 1.85;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 880px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 72px);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
    gap: 56px;
    align-items: end;
    padding-bottom: 64px;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-chapter__axis {
    position: sticky;
    top: calc(var(--header-h) + 36px);
    align-self: start;
    padding-left: 18px;
  }

  .page-about .about-chapter__axis::before {
    bottom: -44px;
  }

  .page-about .about-chapter__note {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    margin-top: 18px;
    letter-spacing: 0.3em;
  }

  .page-about .about-net {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
  }

  .page-about .about-region__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 720px) and (max-width: 879px) {
  .page-about .ms {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 24px;
    padding-left: 32px;
  }

  .page-about .ms__year {
    padding-top: 3px;
    text-align: right;
  }
}

@media (min-width: 760px) {
  .page-about .team {
    grid-template-columns: 148px 190px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
    padding: 26px 0;
  }
}
<<<END>>