.page-about {
  background: var(--starlight);
  color: var(--night);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3vw, 32px) 0 clamp(32px, 4vw, 52px);
  background:
    radial-gradient(72% 100% at 84% 0%, rgba(201, 162, 39, 0.18), rgba(201, 162, 39, 0) 62%),
    linear-gradient(180deg, var(--paper) 0%, var(--starlight) 60%);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.5vw, 44px);
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4.4vw, 3.3rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--night);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin-top: 18px;
  max-width: 48ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--sky);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__panel {
  background: var(--night);
  border-radius: var(--radius);
  padding: clamp(20px, 2.4vw, 28px);
  box-shadow: 0 22px 44px -30px rgba(8, 18, 33, 0.75);
}

.page-about .about-hero__panel-title {
  margin: 0 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-light);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--gold-pale);
}

.page-about .stat-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-left: 11px;
  border-left: 2px solid var(--line-gold);
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .stat__text {
  font-size: 0.8125rem;
  line-height: 1.55;
  color: rgba(248, 246, 240, 0.66);
}

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  margin-top: clamp(30px, 4vw, 46px);
  padding-top: 18px;
  border-top: 1px solid var(--line-gold);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.page-about .about-toc__list a {
  display: inline-block;
  padding: 6px 13px;
  font-size: var(--fs-note);
  color: var(--night);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.55);
  transition: border-color var(--ease), color var(--ease), background var(--ease);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  border-color: var(--gold);
  color: var(--gold-deep);
  background: var(--gold-pale);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter,
.page-about .about-maint,
.page-about .about-sources {
  background: var(--starlight);
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about .about-taxonomy,
.page-about .about-coverage {
  background: var(--paper);
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about .chapter-index {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.2rem, 4.6vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold);
}

.page-about .about-chapter .section-title,
.page-about .about-taxonomy .section-title,
.page-about .about-coverage .section-title,
.page-about .about-sources .section-title,
.page-about .about-maint .section-title {
  margin: 8px 0 0;
  line-height: 1.32;
}

.page-about .about-banner {
  margin: 0 0 clamp(28px, 4vw, 48px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--night);
  aspect-ratio: 16 / 9;
}

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

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 40px);
}

.page-about .about-chapter__text p {
  margin: 0 0 1.15em;
  max-width: 64ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--night);
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin-top: clamp(38px, 5vw, 64px);
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-timeline .eyebrow {
  margin-bottom: 22px;
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--line) 45%, var(--line-soft) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(24px, 3vw, 34px);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 9px;
  width: 9px;
  height: 9px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, 0.16);
  transition: background var(--ease), box-shadow var(--ease);
}

.page-about .timeline__item:hover::before {
  background: var(--gold-deep);
  box-shadow: 0 0 0 5px rgba(201, 162, 39, 0.24);
}

.page-about .timeline__stage {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--gold-deep);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--night);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9688rem;
  line-height: 1.8;
  color: rgba(15, 27, 45, 0.84);
}

.page-about .timeline__more {
  margin-top: 10px;
}

.page-about .timeline__more > summary {
  cursor: pointer;
  list-style: none;
  font-size: var(--fs-note);
  color: var(--gold-deep);
  letter-spacing: 0.02em;
}

.page-about .timeline__more > summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__more > summary::before {
  content: "＋";
  display: inline-block;
  margin-right: 6px;
  color: var(--gold);
  transition: transform var(--ease);
}

.page-about .timeline__more[open] > summary::before {
  transform: rotate(45deg);
}

.page-about .timeline__more p {
  margin: 8px 0 0;
  padding-left: 22px;
  font-size: var(--fs-note);
  line-height: 1.75;
  color: var(--dusk);
  max-width: 58ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--night);
  color: var(--starlight);
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about .about-team__head {
  max-width: 64ch;
}

.page-about .about-team__head .section-title {
  margin: 8px 0 0;
}

.page-about .about-team__head .lede {
  margin-top: 14px;
  line-height: 1.8;
  color: rgba(248, 246, 240, 0.72);
}

.page-about .about-team__grid {
  margin-top: clamp(28px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.5vw, 44px);
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--sky);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 8 / 5;
  object-fit: cover;
}

.page-about .about-team__media .media-frame__caption {
  margin: 0;
  padding: 12px 14px;
  border-top: 1px solid var(--line-light);
  font-size: 0.8125rem;
  line-height: 1.65;
  color: rgba(248, 246, 240, 0.6);
}

.page-about .roster {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .roster__item {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-light);
}

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

.page-about .roster__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 9px;
}

.page-about .roster__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: 0.02em;
  color: var(--starlight);
}

.page-about .roster__count {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  line-height: 1;
  color: var(--gold);
}

.page-about .roster__bar {
  height: 4px;
  border-radius: 2px;
  background: rgba(248, 246, 240, 0.12);
  overflow: hidden;
}

.page-about .roster__fill {
  display: block;
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gold-deep), var(--gold));
}

.page-about .roster__item:nth-child(1) .roster__fill { width: 100%; }
.page-about .roster__item:nth-child(2) .roster__fill { width: 80%; }
.page-about .roster__item:nth-child(3) .roster__fill { width: 60%; }
.page-about .roster__item:nth-child(4) .roster__fill { width: 40%; }

.page-about .roster__text {
  margin: 10px 0 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: rgba(248, 246, 240, 0.68);
}

/* ---------- 分类 ---------- */
.page-about .about-taxonomy__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-taxonomy__text p {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--night);
}

.page-about .about-taxonomy__note {
  padding-left: 14px;
  border-left: 3px solid var(--gold);
  color: var(--sky) !important;
  font-size: 1rem !important;
}

.page-about .about-taxonomy__media {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--starlight);
}

.page-about .about-taxonomy__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.page-about .about-taxonomy__media .media-frame__caption {
  margin: 0;
  padding: 12px 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--dusk);
}

/* ---------- 维护 ---------- */
.page-about .about-maint__head {
  max-width: 64ch;
}

.page-about .about-maint__head .lede {
  margin-top: 14px;
  line-height: 1.8;
  color: var(--sky);
}

.page-about .maint-grid {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .maint-card {
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--starlight);
  transition: background var(--ease);
}

.page-about .maint-card:hover {
  background: var(--paper);
}

.page-about .maint-card__cycle {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--gold-deep);
}

.page-about .maint-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1875rem;
  line-height: 1.4;
  color: var(--night);
}

.page-about .maint-card__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: rgba(15, 27, 45, 0.84);
}

.page-about .maint-card__out {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--patina);
}

/* ---------- 服务范围 ---------- */
.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-coverage__text > p {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--night);
}

.page-about .fact-list {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
}

.page-about .fact-list__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.page-about .fact-list__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .fact-list__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--dusk);
}

.page-about .fact-list__value {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--night);
}

.page-about .contact-card {
  background: var(--night);
  color: var(--starlight);
  border-radius: var(--radius);
  padding: clamp(22px, 3vw, 32px);
  box-shadow: 0 22px 46px -32px rgba(8, 18, 33, 0.8);
}

.page-about .contact-card__title {
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-light);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--gold-pale);
}

.page-about .contact-card__row {
  display: grid;
  gap: 3px;
  padding: 13px 0;
  border-top: 1px solid var(--line-light);
}

.page-about .contact-card__row:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-about .contact-card__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: rgba(248, 246, 240, 0.5);
}

.page-about .contact-card__value {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--starlight);
  word-break: break-word;
}

.page-about .contact-card__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-light);
  font-size: var(--fs-note);
  line-height: 1.75;
  color: rgba(248, 246, 240, 0.62);
}

/* ---------- 来源 ---------- */
.page-about .about-sources__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 44px);
}

.page-about .about-sources__text p {
  margin: 0 0 1.15em;
  max-width: 64ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--night);
}

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

.page-about .pullquote {
  margin: clamp(22px, 3vw, 30px) 0;
  padding: 18px 20px;
  background: var(--paper);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--night);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  background: var(--night-deep);
  color: var(--starlight);
  padding: clamp(44px, 6vw, 74px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-cta__text h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--starlight);
}

.page-about .about-cta__text p {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(248, 246, 240, 0.72);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .fact-list__item {
    grid-template-columns: 7rem minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .page-about .stat__num {
    font-size: 1.75rem;
  }
}

@media (min-width: 760px) {
  .page-about .maint-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-taxonomy__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-sources__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 36px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-chapter__rail,
  .page-about .about-sources__rail {
    position: sticky;
    top: 24px;
  }
}

@media (max-width: 479px) {
  .page-about .stat-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-hero__actions .btn,
  .page-about .about-cta__actions .btn {
    width: 100%;
    text-align: center;
  }
}
<<<END>>>