.page-about {
  --about-hair: rgba(27, 49, 82, 0.16);
  --about-hair-light: rgba(143, 160, 184, 0.3);
  background: var(--mist-050);
  color: var(--ink-950);
}

.page-about img {
  max-width: 100%;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: 1.16;
  letter-spacing: -0.03em;
  margin: 0.55rem 0 0;
  color: inherit;
}

/* 面包屑（页面内微调） */
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.page-about .breadcrumb__list li {
  color: var(--slate-400);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--ink-700);
}

.page-about .breadcrumb__list a {
  color: var(--slate-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--gold-300);
  border-bottom-color: var(--gold-500);
}

.page-about .breadcrumb__list li[aria-current="page"] {
  color: var(--gold-300);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-950);
  color: var(--mist-050);
  padding: clamp(1.75rem, 5vw, 3.25rem) 0 clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 12%, rgba(201, 154, 70, 0.18), transparent 46%),
    radial-gradient(circle at 6% 92%, rgba(76, 140, 121, 0.2), transparent 54%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 2rem;
}

.page-about .about-hero__eyebrow {
  margin-top: 1.5rem;
  color: var(--gold-300);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: var(--fs-display);
  line-height: 1.02;
  letter-spacing: -0.045em;
  margin: 0.9rem 0 0;
  color: var(--mist-050);
}

.page-about .about-hero__lede {
  margin: 1.25rem 0 0;
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--mist-200);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1.75rem;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}

.page-about .fact {
  background: var(--ink-950);
  padding: 0.9rem 1rem;
}

.page-about .fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.55rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--gold-300);
}

.page-about .fact__label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--slate-400);
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
  box-shadow: var(--shadow-gold);
}

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

.page-about .about-hero__caption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--slate-400);
  padding: 0.6rem 0.85rem;
  border-top: 1px solid var(--ink-700);
}

/* 历程：左索引右叙述 */
.page-about .about-chronicle__grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-index {
  border-left: 2px solid var(--gold-500);
  padding-left: 1rem;
}

.page-about .about-index__label {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--slate-500);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  color: var(--slate-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--ink-950);
  border-bottom-color: var(--gold-500);
}

.page-about .about-chronicle__prose {
  margin-top: 1.25rem;
}

.page-about .about-chronicle__prose p {
  margin: 0 0 1rem;
  max-width: 42em;
  line-height: 1.9;
  color: var(--ink-800);
}

/* 时间线 */
.page-about .tl {
  position: relative;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--gold-500), rgba(201, 154, 70, 0));
}

.page-about .tl__item {
  position: relative;
  padding-left: 1.5rem;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 1.15rem;
  width: 7px;
  height: 7px;
  background: var(--mist-050);
  border: 1px solid var(--gold-500);
}

.page-about .tl__details {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .tl__item:target .tl__details {
  border-bottom-color: var(--gold-500);
}

.page-about .tl__item:target::before {
  background: var(--gold-500);
}

.page-about .tl__summary {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.75rem 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl__summary:hover .tl__head,
.page-about .tl__summary:focus-visible .tl__head {
  color: var(--gold-500);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: var(--gold-500);
  flex: none;
}

.page-about .tl__head {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  letter-spacing: -0.01em;
  line-height: 1.35;
  transition: color 0.2s var(--ease);
}

.page-about .tl__body {
  padding: 0 0 1.1rem;
}

.page-about .tl__body p {
  margin: 0;
  max-width: 40em;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--slate-500);
}

/* 团队 */
.page-about .about-crew {
  background: var(--mist-200);
}

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

.page-about .about-crew__lede {
  margin: 1rem 0 0;
  max-width: 34em;
  line-height: 1.9;
  color: var(--ink-800);
}

.page-about .about-crew__media {
  margin: 1.5rem 0 0;
  border: 1px solid var(--about-hair);
  background: var(--mist-050);
  box-shadow: 6px 6px 0 rgba(27, 49, 82, 0.12);
}

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

.page-about .about-crew__caption {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--slate-500);
  padding: 0.55rem 0.8rem;
  border-top: 1px solid var(--about-hair);
}

.page-about .crew {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .crew__row {
  background: var(--mist-050);
  padding: 1.15rem 1.1rem;
}

.page-about .crew__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.page-about .crew__role {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  letter-spacing: -0.01em;
}

.page-about .crew__num {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--ink-800);
  flex: none;
}

.page-about .crew__desc {
  margin: 0.55rem 0 0.85rem;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--slate-500);
}

.page-about .crew__bar {
  height: 4px;
  background: rgba(27, 49, 82, 0.12);
}

.page-about .crew__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--gold-500), var(--celadon-500));
}

/* 服务网络 */
.page-about .about-network {
  background: var(--ink-950);
  color: var(--mist-050);
}

.page-about .about-network__head {
  max-width: 46em;
}

.page-about .about-network__lede {
  margin: 1.1rem 0 0;
  max-width: 42em;
  line-height: 1.9;
  color: var(--mist-200);
}

.page-about .about-network__grid {
  display: grid;
  gap: 1.75rem;
  margin-top: 2rem;
}

.page-about .about-network__fig {
  margin: 0;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
}

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

.page-about .about-network__caption {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--slate-400);
  padding: 0.6rem 0.85rem;
  border-top: 1px solid var(--ink-700);
}

.page-about .about-network__list {
  display: grid;
  gap: 1.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-network__list li {
  border-left: 1px solid var(--gold-500);
  padding-left: 1rem;
}

.page-about .about-network__list strong {
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.01em;
  color: var(--gold-300);
}

.page-about .about-network__list p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--slate-400);
}

.page-about .network-band {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 2.25rem;
  border-top: 1px solid var(--ink-700);
  padding-top: 1rem;
}

.page-about .network-band .nb-line {
  fill: none;
  stroke: rgba(201, 154, 70, 0.42);
  stroke-width: 1;
}

.page-about .network-band .nb-node {
  fill: var(--celadon-500);
}

.page-about .network-band .nb-node--hub {
  fill: var(--gold-500);
}

/* 改版 */
.page-about .about-revision {
  background: var(--ink-900);
  color: var(--mist-050);
}

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

.page-about .about-revision__lead p {
  margin: 1.1rem 0 0;
  max-width: 36em;
  line-height: 1.9;
  color: var(--mist-200);
}

.page-about .revision-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}

.page-about .revision-list__item {
  background: var(--ink-900);
  padding: 1.25rem 1.15rem;
}

.page-about .revision-list__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--gold-500);
}

.page-about .revision-list__title {
  margin: 0.5rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  letter-spacing: -0.01em;
  color: var(--mist-050);
}

.page-about .revision-list__item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--slate-400);
}

/* 服务方法 */
.page-about .about-methods__head {
  max-width: 44em;
}

.page-about .about-methods__lede {
  margin: 1rem 0 0;
  line-height: 1.9;
  color: var(--ink-800);
}

.page-about .methods {
  display: grid;
  gap: 1px;
  margin-top: 2rem;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .method {
  background: var(--mist-050);
  padding: 1.35rem 1.15rem;
  border-top: 2px solid transparent;
  transition: border-color 0.2s var(--ease);
}

.page-about .method:hover {
  border-top-color: var(--gold-500);
}

.page-about .method__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  letter-spacing: -0.01em;
}

.page-about .method p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--slate-500);
}

/* 尾部行动 */
.page-about .about-cta {
  background: var(--ink-950);
  color: var(--mist-050);
  padding: clamp(2.5rem, 6vw, 4rem) 0;
  border-top: 1px solid var(--ink-700);
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: 1.16;
  letter-spacing: -0.03em;
  color: var(--mist-050);
}

.page-about .about-cta__lede {
  margin: 1rem 0 0;
  max-width: 40em;
  line-height: 1.9;
  color: var(--mist-200);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.6rem;
}

/* 平板 */
@media (min-width: 768px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-crew__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 2.25rem;
    align-items: start;
  }

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 2rem;
    align-items: start;
  }

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

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 3rem;
    align-items: end;
  }

  .page-about .about-hero__lede {
    font-size: 1.05rem;
  }

  .page-about .about-chronicle__grid {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 6.5rem;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0.5rem;
  }

  .page-about .about-index__link {
    font-size: 1.15rem;
  }

  .page-about .about-revision__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 3.5rem;
    align-items: start;
  }

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

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__head,
  .page-about .method {
    transition: none;
  }
}

@media print {
  .page-about {
    background: #fff;
    color: #000;
  }

  .page-about .about-hero::before,
  .page-about .about-index,
  .page-about .about-cta__actions {
    display: none;
  }

  .page-about .about-hero,
  .page-about .about-network,
  .page-about .about-revision,
  .page-about .about-cta {
    background: #fff;
    color: #000;
  }

  .page-about .about-hero__title,
  .page-about .about-network__lede,
  .page-about .about-cta__title,
  .page-about .about-cta__lede {
    color: #000;
  }

  .page-about .tl__details {
    break-inside: avoid;
  }
}