.page-about {
  --ab-axis: rgba(107, 122, 143, .34);
  --ab-fade: rgba(107, 122, 143, .16);
}

/* ================= 首屏 ================= */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background: var(--navy);
  color: var(--ivory);
  padding: clamp(52px, 8vw, 112px) 0 clamp(40px, 5vw, 72px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(107, 122, 143, .22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(107, 122, 143, .22) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: radial-gradient(130% 95% at 12% 0%, #000 18%, transparent 76%);
  mask-image: radial-gradient(130% 95% at 12% 0%, #000 18%, transparent 76%);
  pointer-events: none;
}

.page-about .ab-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__title {
  color: var(--white);
  margin: 18px 0 0;
  max-width: 16ch;
  line-height: 1.04;
}

.page-about .ab-hero__lede {
  margin-top: 22px;
  max-width: 46ch;
  color: rgba(245, 241, 232, .82);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .ab-hero__aside {
  align-self: end;
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .ab-facts li {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .ab-facts__k {
  color: var(--gold);
  font-size: .8125rem;
  letter-spacing: .04em;
}

.page-about .ab-facts__v {
  font-size: .9375rem;
  line-height: 1.6;
  color: rgba(245, 241, 232, .78);
}

/* 章节索引条 */
.page-about .ab-index {
  margin-top: clamp(36px, 5vw, 60px);
  padding-top: 18px;
  border-top: 1px solid var(--line-dark);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 4px;
}

.page-about .ab-index a {
  display: inline-block;
  padding: 6px 13px;
  font-size: .8125rem;
  color: rgba(245, 241, 232, .66);
  text-decoration: none;
  border: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-about .ab-index a:hover,
.page-about .ab-index a:focus-visible {
  color: var(--navy);
  background: var(--gold-light);
  border-color: var(--gold-light);
}

.page-about .ab-index a[aria-current="true"] {
  color: var(--navy);
  background: var(--gold);
  border-color: var(--gold);
}

/* ================= 起因 ================= */
.page-about .ab-origin .section-title {
  margin-top: 14px;
}

.page-about .ab-origin__text p {
  margin: 0 0 18px;
  max-width: 38ch;
  font-size: 1.0625rem;
  line-height: 1.85;
}

.page-about .ab-origin__text p:last-of-type {
  margin-bottom: 0;
}

.page-about .ab-origin__note {
  margin-top: 26px !important;
  padding-left: 18px;
  border-left: 3px solid var(--gold);
  font-size: .9375rem !important;
  color: var(--ink-soft);
}

/* ================= 航迹时间轴 ================= */
.page-about .ab-track__title {
  margin-top: 14px;
  max-width: 24ch;
  color: var(--white);
}

.page-about .ab-track__media {
  margin: 34px 0 clamp(40px, 5vw, 64px);
  border-color: var(--line-dark);
}

.page-about .ab-track__media .media__cap {
  color: rgba(245, 241, 232, .6);
}

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

.page-about .track__item {
  display: grid;
  grid-template-columns: 1fr 92px 1fr;
  align-items: start;
}

.page-about .track__node {
  position: relative;
  grid-column: 2;
  grid-row: 1;
  align-self: stretch;
  display: flex;
  justify-content: center;
}

.page-about .track__node::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--ab-axis);
}

.page-about .track__item:last-child .track__node::before {
  bottom: auto;
  height: 18px;
}

.page-about .track__dot {
  position: relative;
  z-index: 1;
  display: block;
  width: 13px;
  height: 13px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px var(--navy), 0 0 0 4px rgba(232, 163, 61, .45);
}

.page-about .track__dot--jade {
  width: 17px;
  height: 17px;
  margin-top: 6px;
  background: var(--jade);
  box-shadow: 0 0 0 3px var(--navy), 0 0 0 4px rgba(15, 181, 166, .5);
}

.page-about .track__body {
  grid-column: 1;
  grid-row: 1;
  text-align: right;
  padding: 0 0 clamp(34px, 4.4vw, 56px);
}

.page-about .track__item:nth-child(even) .track__body {
  grid-column: 3;
  text-align: left;
}

.page-about .track__year {
  margin: 0;
  font-size: .8125rem;
  letter-spacing: .08em;
  color: var(--gold-light);
}

.page-about .track__head {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.125rem, 1.6vw, 1.375rem);
  line-height: 1.35;
  color: var(--white);
}

.page-about .track__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.78;
  color: rgba(245, 241, 232, .74);
}

.page-about .track__item--now .track__year {
  color: var(--jade);
}

/* ================= 河北版图 ================= */
.page-about .ab-atlas__head {
  align-items: end;
  row-gap: 20px;
}

.page-about .ab-atlas__head .section-title {
  margin-top: 14px;
  max-width: 18ch;
}

.page-about .ab-atlas__intro p {
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-atlas__media {
  margin: clamp(28px, 4vw, 46px) 0 clamp(32px, 4.5vw, 56px);
}

.page-about .ab-atlas__sub {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--ink);
}

.page-about .ab-atlas__grid p {
  margin: 0 0 16px;
  max-width: 40ch;
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .atlas {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .atlas__row {
  display: grid;
  grid-template-columns: 72px 1fr 28px;
  align-items: center;
  gap: 14px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color var(--t-fast) var(--ease);
}

.page-about .atlas__row:hover {
  background: rgba(232, 163, 61, .07);
}

.page-about .atlas__name {
  font-size: .875rem;
  color: var(--ink);
}

.page-about .atlas__bar {
  position: relative;
  display: block;
  height: 7px;
  background: var(--ab-fade);
}

.page-about .atlas__bar > i {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--w, 0%);
  display: block;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
}

.page-about .atlas__num {
  text-align: right;
  font-size: .8125rem;
  color: var(--ink-soft);
}

.page-about .atlas__total {
  margin: 0;
  font-size: .875rem;
  color: var(--ink-soft);
}

.page-about .atlas__total .mono {
  color: var(--gold-ink);
  font-weight: 700;
}

.page-about .ab-atlas__link {
  margin: clamp(28px, 3.5vw, 44px) 0 0;
}

/* ================= 团队 ================= */
.page-about .ab-team__head {
  row-gap: 28px;
}

.page-about .ab-team__head .section-title {
  margin-top: 14px;
  max-width: 20ch;
}

.page-about .ab-team__intro {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-team__media {
  margin: 0;
}

.page-about .divisions {
  list-style: none;
  margin: clamp(34px, 4.5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .division {
  background: var(--white);
  padding: clamp(22px, 2.6vw, 34px);
  transition: background-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.page-about .division:hover {
  background: #FFFDF8;
  box-shadow: inset 3px 0 0 var(--gold);
}

.page-about .division__idx {
  margin: 0;
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--gold-ink);
}

.page-about .division__name {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--ink);
}

.page-about .division__desc {
  margin: 0 0 18px;
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .division__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .division__list li {
  position: relative;
  padding: 9px 0 9px 18px;
  font-size: .875rem;
  line-height: 1.65;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .division__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 7px;
  height: 1px;
  background: var(--jade);
}

.page-about .ab-team__foot {
  margin: clamp(26px, 3vw, 40px) 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--jade);
  max-width: 62ch;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ================= 迭代节奏 ================= */
.page-about .ab-cadence__title {
  margin-top: 14px;
  color: var(--white);
  max-width: 16ch;
}

.page-about .ab-cadence__lead {
  align-self: end;
}

.page-about .ab-cadence__lead p {
  margin: 0;
  max-width: 48ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: rgba(245, 241, 232, .78);
}

.page-about .cadence-viz {
  margin: clamp(34px, 4.5vw, 54px) 0 clamp(26px, 3vw, 40px);
}

.page-about .cadence-viz__track {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 6px;
  align-items: end;
  height: 44px;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .cadence-viz__tick {
  display: block;
  height: 24px;
  background: rgba(232, 163, 61, .25);
}

.page-about .cadence-viz__tick:nth-child(3n) {
  height: 38px;
  background: var(--gold);
}

.page-about .cadence-viz__marks {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 10px;
  font-size: .6875rem;
  letter-spacing: .08em;
  color: rgba(245, 241, 232, .5);
}

.page-about .cadence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-dark);
}

.page-about .cadence-list li {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 18px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .cadence-list__k {
  font-size: .8125rem;
  letter-spacing: .05em;
  color: var(--gold);
}

.page-about .cadence-list__v {
  font-size: .9375rem;
  line-height: 1.75;
  color: rgba(245, 241, 232, .78);
}

.page-about .ab-cadence__foot {
  margin: clamp(24px, 3vw, 36px) 0 0;
  max-width: 60ch;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(245, 241, 232, .6);
}

/* ================= 本地生态 ================= */
.page-about .ab-eco .section-title {
  margin-top: 14px;
  max-width: 18ch;
}

.page-about .ab-eco__text p {
  margin: 0 0 18px;
  max-width: 46ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .eco-stats {
  list-style: none;
  margin: clamp(34px, 4.5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .eco-stats__item {
  background: var(--white);
  padding: clamp(20px, 2.4vw, 30px) clamp(16px, 2vw, 24px);
}

.page-about .eco-stats__num {
  margin: 0;
  font-size: clamp(1.75rem, 3.4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--navy);
}

.page-about .eco-stats__item:nth-child(1) .eco-stats__num { color: var(--gold-ink); }
.page-about .eco-stats__item:nth-child(2) .eco-stats__num { color: var(--jade-ink); }
.page-about .eco-stats__item:nth-child(3) .eco-stats__num { color: var(--navy); }
.page-about .eco-stats__item:nth-child(4) .eco-stats__num { color: var(--coral-ink); }

.page-about .eco-stats__label {
  margin: 8px 0 0;
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* ================= 下一步 ================= */
.page-about .ab-next__title {
  margin-top: 14px;
  max-width: 22ch;
  color: var(--white);
}

.page-about .ab-next__grid {
  margin-top: clamp(30px, 4vw, 48px);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .ab-next__card {
  display: block;
  padding: clamp(22px, 2.6vw, 34px);
  background: var(--navy);
  text-decoration: none;
  color: inherit;
  transition: background-color var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  background: var(--navy-mid);
  transform: translateY(-4px);
}

.page-about .ab-next__idx {
  margin: 0;
  font-size: .75rem;
  letter-spacing: .08em;
  color: rgba(245, 241, 232, .45);
}

.page-about .ab-next__name {
  margin: 14px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  line-height: 1.4;
  color: var(--white);
}

.page-about .ab-next__desc {
  margin: 0 0 20px;
  font-size: .9375rem;
  line-height: 1.75;
  color: rgba(245, 241, 232, .72);
}

.page-about .ab-next__go {
  display: inline-block;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--gold);
  border-bottom: 1px solid rgba(232, 163, 61, .5);
  padding-bottom: 2px;
}

.page-about .ab-next__foot {
  margin-top: clamp(30px, 4vw, 46px);
  padding-top: 26px;
  border-top: 1px solid var(--line-dark);
  display: flex;
  flex-wrap: wrap;
  gap: 20px 40px;
  align-items: center;
  justify-content: space-between;
}

.page-about .ab-next__trust {
  margin: 0;
  max-width: 54ch;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(245, 241, 232, .68);
}

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

/* ================= 响应式 ================= */
@media (max-width: 1080px) {
  .page-about .grid12 .span-7,
  .page-about .grid12 .span-6,
  .page-about .grid12 .span-5,
  .page-about .grid12 .span-4 {
    grid-column: 1 / -1;
  }

  .page-about .ab-hero__aside {
    margin-top: 36px;
  }
}

@media (max-width: 860px) {
  .page-about .eco-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .ab-next__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .page-about .track__item {
    grid-template-columns: 46px 1fr;
  }

  .page-about .track__node {
    grid-column: 1;
    grid-row: 1;
    justify-content: flex-start;
  }

  .page-about .track__node::before {
    left: 6px;
  }

  .page-about .track__dot,
  .page-about .track__dot--jade {
    margin-left: 0;
  }

  .page-about .track__body,
  .page-about .track__item:nth-child(even) .track__body {
    grid-column: 2;
    grid-row: 1;
    text-align: left;
    padding-left: 4px;
  }

  .page-about .cadence-list li {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .page-about .cadence-viz__marks {
    font-size: .625rem;
  }
}

@media (max-width: 560px) {
  .page-about .ab-facts li {
    grid-template-columns: 58px 1fr;
    gap: 12px;
  }

  .page-about .eco-stats {
    grid-template-columns: 1fr;
  }

  .page-about .atlas__row {
    grid-template-columns: 62px 1fr 24px;
    gap: 10px;
  }

  .page-about .ab-next__foot {
    flex-direction: column;
    align-items: flex-start;
  }
}
<<<END>>>

.page-about {
  --w: 1rem;
}