.page-about {
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about [id] {
  scroll-margin-top: 84px;
}

.page-about .breadcrumbs {
  padding-top: clamp(16px, 2.4vw, 26px);
}

.page-about p {
  margin: 0 0 1em;
  line-height: 1.8;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(22px, 4vw, 48px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(38px, 7.4vw, 88px);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 36em;
  font-size: clamp(16px, 1.6vw, 18px);
  color: var(--paper);
}

.page-about .about-hero__note {
  max-width: 40em;
  margin-top: 14px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-size: 14px;
  line-height: 1.75;
  color: var(--gold-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

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

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

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

  .page-about .about-hero__figure img {
    aspect-ratio: 3 / 4;
    height: 100%;
  }
}

/* ---------- 章节导航 ---------- */

.page-about .chapter-nav {
  margin-top: clamp(26px, 5vw, 52px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-deep);
}

.page-about .chapter-nav__list {
  display: flex;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .chapter-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  white-space: nowrap;
  color: var(--gold-soft);
  text-decoration: none;
}

.page-about .chapter-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 9px;
  height: 1px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 160ms var(--ease);
}

.page-about .chapter-nav__link:hover::after,
.page-about .chapter-nav__link:focus-visible::after {
  transform: scaleX(1);
}

.page-about .chapter-nav__link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

@media (min-width: 1040px) {
  .page-about .chapter-nav {
    position: sticky;
    top: 0;
    z-index: 2;
  }

  .page-about .chapter-nav__list {
    justify-content: center;
  }
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  padding-top: clamp(44px, 7vw, 84px);
  color: var(--paper);
}

.page-about .about-section__head {
  max-width: 58ch;
}

.page-about .about-section__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.8vw, 44px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-section__lede {
  max-width: 48em;
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 40px);
  align-items: start;
}

.page-about .about-grid img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border: 1px solid var(--line);
}

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

  .page-about .about-grid--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

/* ---------- 服务方法 ---------- */

.page-about .about-statement {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 34px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-statement__text p {
  font-size: 16px;
  line-height: 1.85;
}

.page-about .about-statement__aside {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: clamp(14px, 2.4vw, 22px);
}

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

/* ---------- 统计条 ---------- */

.page-about .stat-strip {
  margin: clamp(18px, 3vw, 26px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .stat-strip__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .stat-strip__row dt {
  font-size: 14px;
  color: var(--gold-soft);
}

.page-about .stat-strip__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
  text-align: right;
}

.page-about .stat-strip__row dd .mono {
  font-size: 22px;
}

/* ---------- 编年时间线 ---------- */

.page-about .year-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .year-index__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 88px;
  min-height: 44px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--gold-soft);
  text-decoration: none;
  transition: border-color 160ms var(--ease), color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .year-index__link:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .year-index__link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .timeline {
  margin: clamp(22px, 4vw, 38px) 0 0;
  padding: 0 0 0 18px;
  list-style: none;
  border-left: 1px solid var(--line-strong);
}

.page-about .timeline__item {
  position: relative;
  padding: 4px 0 30px 14px;
  transition: background 160ms var(--ease);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 9px;
  height: 1px;
  background: var(--gold);
}

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

.page-about .timeline__item:target {
  background: var(--wash);
}

.page-about .timeline__item:target::before {
  height: 2px;
  background: var(--orange);
}

.page-about .timeline__year {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--gold);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
}

.page-about .timeline__link {
  color: var(--gold-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .timeline__link:hover {
  border-bottom-color: var(--orange);
  color: var(--orange);
}

.page-about .timeline__link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

@media (min-width: 820px) {
  .page-about .timeline {
    padding-left: 28px;
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 4px 24px;
    padding-left: 16px;
  }

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

@media (min-width: 1040px) {
  .page-about .timeline__item:nth-child(even) {
    margin-left: 7%;
  }
}

/* ---------- 覆盖范围 ---------- */

.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: clamp(18px, 3vw, 26px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .coverage-stats__item {
  padding: 14px 12px 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .coverage-stats__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 27px);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .coverage-stats__label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--gold-soft);
}

.page-about .info-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .info-tags li {
  border: 1px solid var(--line);
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--gold-soft);
}

@media (min-width: 620px) {
  .page-about .coverage-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 合作生态 ---------- */

.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .eco__core {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  margin: 0;
  padding: 18px 20px;
  border: 1px solid var(--line-strong);
  background: var(--panel-2);
}

.page-about .eco__core-name {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--gold-soft);
}

.page-about .eco__core-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--gold-soft);
}

.page-about .eco__nodes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .eco__node {
  padding: 16px 18px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: transform 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .eco__node:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  background: var(--panel-2);
}

.page-about .eco__node:focus-visible {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  background: var(--panel-2);
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .eco__count {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--orange);
}

.page-about .eco__label {
  display: block;
  margin-top: 4px;
  font-size: 15px;
  color: var(--paper);
}

.page-about .eco__note {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--gold-soft);
  transition: max-height 180ms var(--ease), opacity 180ms var(--ease), margin-top 180ms var(--ease);
}

.page-about .eco__node:hover .eco__note,
.page-about .eco__node:focus-visible .eco__note {
  max-height: 7em;
  opacity: 1;
  margin-top: 8px;
}

@media (min-width: 820px) {
  .page-about .eco__nodes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 服务原则 ---------- */

.page-about .principles {
  margin-top: clamp(18px, 3vw, 30px);
  padding: clamp(20px, 3.6vw, 46px);
  background: var(--gold-soft);
  border: 1px solid var(--gold);
  color: var(--ink);
}

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

.page-about .principles__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .principles__list {
  display: grid;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(8, 35, 29, 0.26);
}

.page-about .principles__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(8, 35, 29, 0.2);
}

.page-about .principles__num {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(8, 35, 29, 0.62);
}

.page-about .principles__head {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .principles__text {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(8, 35, 29, 0.88);
}

.page-about .principles__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .principles .btn--ghost {
  color: var(--ink);
  border-color: rgba(8, 35, 29, 0.42);
  background: transparent;
}

.page-about .principles .btn--ghost:hover {
  background: rgba(8, 35, 29, 0.08);
}

.page-about .principles .btn:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

@media (min-width: 820px) {
  .page-about .principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: clamp(16px, 2.4vw, 32px);
  }

  .page-about .principles__item {
    grid-template-columns: 32px minmax(0, 1fr);
    align-content: start;
  }
}
<<<PAGE_CSS_END>>>