.page-about {
  --about-line: rgba(159, 190, 224, 0.2);
  --about-line-strong: rgba(159, 190, 224, 0.34);
  --about-panel: rgba(159, 190, 224, 0.07);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: 56px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  font-size: clamp(30px, 6.4vw, 52px);
  line-height: 1.16;
  font-weight: 300;
  letter-spacing: -0.01em;
  color: var(--light-100);
}

.page-about .about-hero__intro .lead {
  max-width: 62ch;
}

.page-about .about-hero__board {
  border: 1px solid var(--about-line-strong);
  border-radius: var(--radius);
  background: var(--glass);
  padding: 22px 22px 10px;
  backdrop-filter: blur(10px);
}

.page-about .about-board__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--blue-200);
}

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

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

.page-about .about-board__row:first-child {
  border-top: 0;
}

.page-about .about-board__term {
  font-size: 14px;
  color: var(--text-dim);
}

.page-about .about-board__value {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--copper-300);
  font-variant-numeric: tabular-nums;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(300px, 1fr);
    align-items: start;
    gap: 48px;
  }
}

/* ---------- 沿革时间轴 ---------- */
.page-about .about-origin__figure {
  margin: 34px 0 0;
}

.page-about .about-timeline {
  position: relative;
  margin: 44px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px 42px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 22px;
  bottom: -4px;
  width: 1px;
  background: var(--about-line);
}

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

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-timeline__node {
  position: absolute;
  left: 0;
  top: 6px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  border: 2px solid var(--copper-500);
  background: var(--ink-900);
  box-shadow: 0 0 0 4px rgba(200, 118, 42, 0.12);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__node {
  transform: scale(1.16);
  box-shadow: 0 0 0 7px rgba(200, 118, 42, 0.18);
}

.page-about .about-timeline__era {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.13em;
  color: var(--copper-300);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: 20px;
  line-height: 1.4;
  font-weight: 600;
  color: var(--light-100);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-dim);
}

@media (min-width: 860px) {
  .page-about .about-timeline {
    margin-top: 54px;
  }
  .page-about .about-timeline__item {
    padding-left: 56px;
  }
  .page-about .about-timeline__item::before {
    left: 11px;
  }
  .page-about .about-timeline__node {
    width: 23px;
    height: 23px;
  }
  .page-about .about-timeline__title {
    font-size: 22px;
  }
}

/* ---------- 工龄台阶 ---------- */
.page-about .about-stairs-wrap {
  margin: 38px 0 0;
}

.page-about .about-stairs {
  display: block;
  width: 100%;
  max-width: 680px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-stairs__step {
  fill: rgba(159, 190, 224, 0.09);
  stroke: var(--about-line-strong);
  stroke-width: 1.5;
}

.page-about .about-stairs__step--top {
  fill: rgba(200, 118, 42, 0.16);
  stroke: var(--copper-500);
}

.page-about .about-stairs__name {
  fill: var(--light-100);
  font-family: var(--font-sans);
  font-size: 19px;
  font-weight: 600;
}

.page-about .about-stairs__coef {
  fill: var(--copper-300);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.page-about .about-tier-grid {
  display: grid;
  gap: 18px;
  margin-top: 36px;
}

.page-about .about-tier-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 22px 22px;
  border: 1px solid var(--about-line-strong);
  border-left: 3px solid var(--copper-500);
  border-radius: var(--radius);
  background: var(--about-panel);
}

.page-about .about-tier-card__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.13em;
  color: var(--blue-200);
}

.page-about .about-tier-card__name {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  color: var(--light-100);
}

.page-about .about-tier-card__count {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 4px 0 0;
  font-family: var(--font-mono);
}

.page-about .about-tier-card__count .num {
  font-size: clamp(46px, 9vw, 68px);
  line-height: 1;
  color: var(--copper-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-tier-card__coef {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--foam-500);
}

.page-about .about-tier-card__note {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .about-seniority__link {
  margin: 30px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-seniority__link a,
.page-about .about-split__foot a,
.page-about .about-partner__foot a {
  color: var(--copper-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(231, 178, 124, 0.45);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-seniority__link a:hover,
.page-about .about-split__foot a:hover,
.page-about .about-partner__foot a:hover {
  color: var(--copper-500);
  border-bottom-color: var(--copper-500);
}

@media (min-width: 760px) {
  .page-about .about-tier-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

/* ---------- 双栏图文 ---------- */
.page-about .about-split {
  display: grid;
  gap: 30px;
  align-items: center;
}

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

.page-about .about-split__body .section-title {
  margin-top: 12px;
}

.page-about .about-split__text,
.page-about .about-split__foot {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-check {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-check__item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-check__item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-check__num {
  flex: 0 0 auto;
  min-width: 74px;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1.1;
  color: var(--copper-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-check__text {
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 52px;
  }
  .page-about .about-split--flip .about-split__media {
    order: 2;
  }
}

/* ---------- 服务区域 ---------- */
.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 34px;
  border: 1px solid var(--about-line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--about-line-strong);
}

.page-about .about-stat {
  padding: 24px 20px;
  background: var(--blue-700);
}

.page-about .about-stat__value {
  display: flex;
  align-items: baseline;
  gap: 5px;
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__value .num {
  font-size: clamp(36px, 7vw, 54px);
  line-height: 1;
  color: var(--copper-300);
}

.page-about .about-stat__label {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .about-coverage__note {
  margin-top: 28px;
  padding: 22px 24px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: var(--glass);
}

.page-about .about-coverage__note p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

@media (min-width: 760px) {
  .page-about .about-coverage__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 合作与加入 ---------- */
.page-about .about-partner__panels {
  display: grid;
  gap: 14px;
  margin-top: 34px;
}

.page-about .about-list {
  margin: 12px 0 0;
  padding: 0 0 0 18px;
  list-style: none;
}

.page-about .about-list li {
  position: relative;
  padding: 5px 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: -16px;
  top: 15px;
  width: 7px;
  height: 1px;
  background: var(--copper-500);
}

.page-about .about-partner__foot {
  margin: 30px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dim);
}

@media (min-width: 860px) {
  .page-about .about-partner__panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__node {
    transition: none;
  }
  .page-about .about-timeline__item:hover .about-timeline__node {
    transform: none;
  }
}
<<<END>>>