.page-about {
  background: var(--yx-night);
  color: var(--yx-text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: 28px 0 56px;
}

.page-about .ab-hero__title {
  margin: 16px 0 0;
  max-width: 22ch;
  font-family: var(--yx-font-sans);
  font-weight: 300;
  font-size: clamp(31px, 7.6vw, 62px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--yx-paper);
}

.page-about .ab-hero__lede {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--yx-text);
}

.page-about .ab-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  margin: 26px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px dashed var(--yx-gold-line);
  font-family: var(--yx-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--yx-text-dim);
}

.page-about .ab-facts__item {
  position: relative;
  padding-left: 12px;
}

.page-about .ab-facts__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.52em;
  width: 4px;
  height: 4px;
  background: var(--yx-gold);
  border-radius: 50%;
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-chapter {
  position: relative;
  padding: 60px 0;
  border-top: 1px solid var(--yx-gold-line);
}

.page-about .ab-chapter--panel {
  background: var(--yx-panel);
}

.page-about .ab-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .ab-head__num {
  font-family: var(--yx-font-display);
  font-weight: 700;
  font-size: 54px;
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--yx-gold);
}

.page-about .ab-head__title {
  margin: 0;
  font-family: var(--yx-font-sans);
  font-weight: 500;
  font-size: clamp(25px, 4.8vw, 42px);
  line-height: 1.26;
  color: var(--yx-paper);
}

.page-about .ab-claim {
  margin: 20px 0 0;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 600;
  line-height: 1.62;
  color: var(--yx-paper);
}

.page-about .ab-text {
  margin: 14px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--yx-text);
}

.page-about .ab-note {
  margin: 22px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--yx-gold-line);
  font-family: var(--yx-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--yx-text-dim);
}

/* ---------- 01 起点 ---------- */
.page-about .ab-origin {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-origin__media {
  position: relative;
  margin: 0;
}

.page-about .ab-origin__img {
  display: block;
  width: 100%;
  height: clamp(200px, 44vw, 440px);
  object-fit: cover;
  filter: saturate(0.82) brightness(0.78);
}

.page-about .ab-origin__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 36, 28, 0.18) 0%, rgba(11, 36, 28, 0.97) 100%);
}

.page-about .ab-origin__cap {
  position: absolute;
  left: var(--yx-pad);
  bottom: 16px;
  z-index: 2;
  font-family: var(--yx-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--yx-gold);
}

.page-about .ab-origin__panel {
  position: relative;
  z-index: 3;
  margin-top: -44px;
  padding: 26px 20px 24px;
  border: 1px solid var(--yx-gold-line);
  border-radius: var(--yx-radius);
  background: rgba(18, 54, 43, 0.9);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.page-about .ab-origin__panel .ab-note {
  margin-top: 26px;
}

/* ---------- 02 三条数据线 ---------- */
.page-about .ab-pillars {
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-pillar {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 24px 0;
  border-bottom: 1px dashed var(--yx-gold-line);
}

.page-about .ab-pillar__key {
  grid-row: 1 / span 2;
  font-family: var(--yx-font-display);
  font-weight: 700;
  font-size: 38px;
  line-height: 1;
  color: var(--yx-gold);
}

.page-about .ab-pillar__name {
  margin: 0;
  font-size: 21px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--yx-paper);
}

.page-about .ab-pillar__desc {
  margin: 0;
  max-width: 40em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--yx-text);
}

.page-about .ab-meter {
  margin-top: 16px;
  max-width: 420px;
}

.page-about .yx-meter__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--yx-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--yx-text-dim);
}

.page-about .ab-meter__label {
  font-family: var(--yx-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--yx-text-dim);
}

.page-about .yx-meter__value {
  font-family: var(--yx-font-display);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--yx-paper);
}

/* ---------- 03 版本时间轴 ---------- */
.page-about .ab-timeline {
  display: flex;
  gap: 18px;
  margin: 38px 0 0;
  padding: 0 0 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--yx-gold-soft) transparent;
}

.page-about .ab-timeline::-webkit-scrollbar {
  height: 3px;
}

.page-about .ab-timeline::-webkit-scrollbar-thumb {
  background: var(--yx-gold-soft);
}

.page-about .ab-node {
  flex: 0 0 76%;
  min-width: 224px;
  max-width: 300px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-snap-align: start;
}

.page-about .ab-node__year {
  font-family: var(--yx-font-display);
  font-weight: 700;
  font-size: 46px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--yx-gold);
}

.page-about .ab-node__rail {
  position: relative;
  display: block;
  height: 1px;
  background: var(--yx-gold-line);
}

.page-about .ab-node__rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: -4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--yx-gold);
}

.page-about .ab-node .yx-drawer__trigger {
  font-size: 14px;
  line-height: 1.5;
  text-align: left;
}

.page-about .ab-node .yx-drawer__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--yx-text);
}

.page-about .ab-strip {
  margin: 32px 0 0;
}

.page-about .ab-strip img {
  display: block;
  width: 100%;
  height: clamp(130px, 26vw, 230px);
  object-fit: cover;
  filter: saturate(0.78) brightness(0.72);
}

.page-about .ab-strip__cap {
  margin-top: 10px;
  font-family: var(--yx-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--yx-text-dim);
}

/* ---------- 04 团队分工 ---------- */
.page-about .ab-roles {
  display: grid;
  gap: 16px;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-role {
  padding: 24px 20px 22px;
  border: 1px solid var(--yx-gold-line);
  border-radius: var(--yx-radius);
  background: rgba(241, 232, 216, 0.05);
  transition: background 0.24s ease, border-color 0.24s ease, transform 0.24s ease;
}

.page-about .ab-role:hover,
.page-about .ab-role:focus-within {
  background: rgba(241, 232, 216, 0.1);
  border-color: var(--yx-gold-soft);
  transform: translateY(-4px);
}

.page-about .ab-role__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--yx-gold-soft);
  border-radius: 50%;
  font-family: var(--yx-font-mono);
  font-size: 16px;
  letter-spacing: 0.04em;
  color: var(--yx-gold);
}

.page-about .ab-role__name {
  margin: 16px 0 0;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--yx-paper);
}

.page-about .ab-role__count {
  margin: 8px 0 0;
  font-family: var(--yx-font-display);
  font-weight: 700;
  font-size: 32px;
  line-height: 1;
  color: var(--yx-gold);
}

.page-about .ab-role__note {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--yx-text);
}

.page-about .ab-workbench {
  margin: 38px 0 0;
}

/* ---------- 05 数据来源 ---------- */
.page-about .ab-sources {
  display: grid;
  gap: 30px;
  margin-top: 30px;
}

.page-about .ab-sources__main .ab-text:first-child {
  margin-top: 0;
}

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

.page-about .ab-sources__item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--yx-gold-line);
}

.page-about .ab-sources__item:first-child {
  border-top: 1px dashed var(--yx-gold-line);
}

.page-about .ab-sources__num {
  flex: 0 0 62px;
  font-family: var(--yx-font-display);
  font-weight: 700;
  font-size: 38px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--yx-gold);
}

.page-about .ab-sources__label {
  font-size: 15px;
  line-height: 1.6;
  color: var(--yx-text);
}

/* ---------- 06 服务规模 ---------- */
.page-about .ab-reach {
  background: var(--yx-paper);
  border-top: 0;
}

.page-about .ab-reach .ab-head__num {
  color: rgba(20, 32, 28, 0.14);
}

.page-about .ab-reach .ab-head__title,
.page-about .ab-reach .ab-claim {
  color: var(--yx-ink);
}

.page-about .ab-reach .ab-text {
  color: var(--yx-ink-soft);
}

.page-about .ab-reach .ab-note {
  color: var(--yx-ink-soft);
  border-top-color: rgba(20, 32, 28, 0.18);
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 20px;
  margin-top: 38px;
}

.page-about .ab-stat {
  padding-top: 14px;
  border-top: 2px solid var(--yx-ink);
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--yx-font-display);
  font-weight: 700;
  font-size: 42px;
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--yx-ink);
}

.page-about .ab-stat__unit {
  font-size: 0.52em;
  margin-left: 2px;
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 10px;
  font-family: var(--yx-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--yx-ink-soft);
}

/* ---------- 结尾入口 ---------- */
.page-about .ab-cta {
  padding: 64px 0 76px;
  border-top: 1px solid var(--yx-gold-line);
}

.page-about .ab-cta__title {
  margin: 14px 0 0;
  max-width: 24ch;
  font-family: var(--yx-font-sans);
  font-weight: 300;
  font-size: clamp(24px, 4.6vw, 40px);
  line-height: 1.3;
  color: var(--yx-paper);
}

.page-about .ab-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 860px) {
  .page-about .ab-hero {
    padding: 44px 0 76px;
  }

  .page-about .ab-chapter {
    padding: 86px 0;
  }

  .page-about .ab-head {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 14px 44px;
  }

  .page-about .ab-head__num {
    font-size: 88px;
    padding-top: 4px;
  }

  .page-about .ab-origin__panel {
    margin-top: -78px;
    padding: 40px 44px 34px;
  }

  .page-about .ab-pillar {
    grid-template-columns: 56px minmax(160px, 0.9fr) minmax(0, 2.1fr);
    gap: 0 40px;
    padding: 30px 0;
    align-items: start;
  }

  .page-about .ab-pillar__key {
    grid-row: auto;
    font-size: 44px;
  }

  .page-about .ab-node {
    flex: 0 0 280px;
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: start;
  }

  .page-about .ab-role:nth-child(2) {
    margin-top: 34px;
  }

  .page-about .ab-role:nth-child(3) {
    margin-top: 12px;
  }

  .page-about .ab-sources {
    grid-template-columns: minmax(0, 1.45fr) minmax(250px, 0.8fr);
    gap: 56px;
    margin-top: 36px;
  }

  .page-about .ab-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 20px;
    margin-top: 48px;
  }

  .page-about .ab-stat--lead {
    grid-column: span 2;
  }

  .page-about .ab-stat--lead .ab-stat__num {
    font-size: clamp(64px, 8vw, 108px);
  }

  .page-about .ab-cta {
    padding: 88px 0 104px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__title {
    max-width: 18ch;
  }

  .page-about .ab-origin__cap {
    bottom: 22px;
  }
}
</PAGE_CSS>>>