.page-about {
  --ab-edge: rgba(35, 224, 208, 0.3);
  --ab-cyan-fade: rgba(35, 224, 208, 0.36);
  --ab-orange-fade: rgba(255, 138, 61, 0);
}

.page-about [hidden] {
  display: none;
}

.page-about .crumb {
  padding: 20px 0 0;
}

/* ---------- 首屏框景 ---------- */

.page-about .ab-hero {
  padding: 22px 0 0;
}

.page-about .ab-hero__inner {
  position: relative;
  padding: 32px 20px 28px;
  background:
    linear-gradient(152deg, rgba(108, 59, 255, 0.22), rgba(14, 10, 31, 0) 60%),
    var(--c-panel-2);
  border: 1px solid var(--line);
  clip-path: var(--cut);
}

.page-about .ab-hero__inner::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(180deg, rgba(217, 214, 236, 0.05) 0 1px, rgba(0, 0, 0, 0) 1px 7px),
    repeating-linear-gradient(90deg, rgba(138, 143, 168, 0.14) 0 1px, rgba(0, 0, 0, 0) 1px 48px);
  background-position: 0 0, 0 100%;
  background-size: auto, auto 14px;
  background-repeat: repeat, no-repeat;
}

.page-about .ab-hero__inner > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero h1 {
  margin: 14px 0 16px;
  font-size: 32px;
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-head);
}

.page-about .ab-hero__lead {
  max-width: 34em;
  margin: 0;
  color: var(--c-body);
}

.page-about .ab-fact-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line-soft);
}

.page-about .ab-fact-list li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--c-panel);
}

.page-about .ab-fact__num {
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .ab-fact__label {
  font-size: 13px;
  color: var(--c-scale);
}

/* ---------- 章节通用 ---------- */

.page-about .ab-sec {
  padding: 52px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-sec__head {
  margin-bottom: 26px;
}

.page-about .ab-sec__head h2 {
  margin: 10px 0 12px;
  font-size: 25px;
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-head);
}

.page-about .ab-sec__head .lead {
  max-width: 36em;
  margin: 0;
}

.page-about .ab-link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--ab-cyan-fade);
  padding-bottom: 1px;
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 团队与时间轴 ---------- */

.page-about .ab-who__grid {
  display: grid;
  gap: 32px;
}

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

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 24px 26px;
  border-left: 1px solid var(--line);
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 3px;
  width: 11px;
  height: 11px;
  background: var(--c-bg);
  border: 1px solid var(--c-cyan);
  transform: rotate(45deg);
}

.page-about .ab-tl__item:last-child::before {
  background: var(--c-cyan);
  box-shadow: 0 0 10px rgba(35, 224, 208, 0.5);
}

.page-about .ab-tl__idx {
  display: block;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.page-about .ab-tl__title {
  margin: 6px 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--c-head);
}

.page-about .ab-tl__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-dim);
}

.page-about .ab-who__body p {
  margin: 0 0 18px;
}

.page-about .ab-who__fig {
  margin: 26px 0 0;
  aspect-ratio: 3 / 2;
}

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

/* ---------- 版本带 ---------- */

.page-about .ab-ver__strip {
  display: flex;
  gap: 14px;
  max-width: 100%;
  margin: 20px 0 0;
  padding: 4px 2px 16px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-ver {
  flex: 0 0 auto;
  width: 188px;
  scroll-snap-align: start;
  padding: 18px 16px 20px;
  background: var(--c-panel);
  border: 1px solid var(--line);
  clip-path: var(--cut);
}

.page-about .ab-ver:nth-child(2n) {
  width: 232px;
}

.page-about .ab-ver:nth-child(3n) {
  width: 206px;
}

.page-about .ab-ver:last-child {
  border-color: rgba(255, 138, 61, 0.5);
  background:
    linear-gradient(158deg, rgba(255, 138, 61, 0.14), var(--c-panel) 72%);
}

.page-about .ab-ver__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 9px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-cyan);
  border: 1px solid var(--ab-edge);
}

.page-about .ab-ver h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--c-head);
}

.page-about .ab-ver p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-dim);
}

.page-about .ab-ver__figure {
  margin: 22px 0 0;
  aspect-ratio: 12 / 5;
}

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

.page-about .ab-ver__note {
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--c-dim);
}

/* ---------- 资料库档案柜 ---------- */

.page-about .ab-db__grid {
  display: grid;
  gap: 18px;
}

.page-about .ab-db__list {
  display: block;
}

.page-about .ab-file {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .ab-file__code {
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
  padding-top: 2px;
}

.page-about .ab-file__body h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  color: var(--c-head);
}

.page-about .ab-file__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-body);
}

.page-about .ab-file__points {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .ab-file__points li {
  position: relative;
  padding-left: 17px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-dim);
}

.page-about .ab-file__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 1px;
  background: var(--c-cyan);
}

.page-about .ab-db__note {
  margin: 24px 0 0;
  font-size: 14px;
  color: var(--c-dim);
}

/* ---------- 山西落点 ---------- */

.page-about .ab-home__panel {
  display: grid;
  gap: 24px;
  padding: 24px 20px;
  background: var(--c-panel-2);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--c-ochre);
}

.page-about .ab-home__text h2 {
  margin: 10px 0 14px;
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-head);
}

.page-about .ab-home__text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-body);
}

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

.page-about .ab-home__fig {
  margin: 0;
  aspect-ratio: 20 / 13;
}

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

/* ---------- 更新方向 ---------- */

.page-about .ab-next__grid {
  position: relative;
  display: grid;
  gap: 16px;
  padding-bottom: 20px;
}

.page-about .ab-next__grid::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-orange), var(--ab-orange-fade) 74%);
}

.page-about .ab-next__card {
  padding: 20px 18px 22px;
  background: var(--c-panel);
  border: 1px solid var(--line-soft);
  clip-path: var(--cut);
}

.page-about .ab-next__idx {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--c-scale);
}

.page-about .ab-next__card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--c-head);
}

.page-about .ab-next__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-dim);
}

.page-about .ab-next__foot {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-body);
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .ab-hero__inner {
    padding: 44px 36px 38px;
  }

  .page-about .ab-fact-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-home__panel {
    padding: 30px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding-top: 28px;
  }

  .page-about .ab-hero h1 {
    font-size: 54px;
    max-width: 20ch;
  }

  .page-about .ab-sec {
    padding: 68px 0;
  }

  .page-about .ab-sec__head h2 {
    font-size: 36px;
  }

  .page-about .ab-home__text h2 {
    font-size: 30px;
  }

  .page-about .ab-db__grid {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 0;
    border: 1px solid var(--line-soft);
  }

  .page-about .ab-db__rail {
    padding: 22px 18px;
    border-right: 1px solid var(--line-soft);
  }

  .page-about .ab-db__list {
    padding: 24px 28px;
  }

  .page-about .ab-file:first-child {
    padding-top: 0;
  }

  .page-about .ab-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 960px) {
  .page-about .ab-who__grid {
    grid-template-columns: minmax(250px, 320px) minmax(0, 1fr);
    gap: 58px;
  }

  .page-about .ab-home__panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
    gap: 40px;
    padding: 36px 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-ver__strip {
    scroll-behavior: auto;
  }
}
<<<END>>>