.page-about {
  --ab-cut: 16px;
  --ab-line-soft: rgba(242, 237, 227, .14);
  --ab-line-dark: rgba(26, 31, 28, .14);
  background: var(--ink);
  color: var(--paper);
}

.page-about .section {
  position: relative;
}

.page-about .crumb {
  margin-bottom: clamp(20px, 4vw, 34px);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  padding: clamp(22px, 4vw, 44px) 0 clamp(44px, 7vw, 88px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .ab-kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .ab-kicker__dot {
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--lime);
  transform: rotate(45deg);
}

.page-about .ab-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(30px, 7.6vw, 64px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--paper-2);
}

.page-about .ab-hero__intro {
  max-width: 40ch;
  margin: 0 0 26px;
  font-size: 16.5px;
  line-height: 1.78;
  color: rgba(242, 237, 227, .78);
}

.page-about .ab-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-facts {
  background: var(--paper);
  color: var(--ink-2);
  padding: clamp(20px, 4vw, 30px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .ab-facts__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: #6B736D;
}

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

.page-about .ab-facts__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .ab-facts__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .ab-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 6.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .ab-facts__lab {
  font-size: 14px;
  line-height: 1.62;
  color: #49514C;
}

/* ---------- 时间轴 ---------- */

.page-about .ab-stage-band {
  padding-top: 0;
}

.page-about .ab-tl-figure {
  margin: 0 0 clamp(30px, 5vw, 52px);
  border: 1px solid var(--ab-line-soft);
  background: var(--ink-3);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  overflow: hidden;
}

.page-about .ab-tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .ab-tl-figure__cap {
  padding: 12px 18px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(242, 237, 227, .62);
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  display: grid;
  gap: 22px;
  border-left: 1px solid var(--ab-line-soft);
}

.page-about .ab-tl-item {
  position: relative;
}

.page-about .ab-tl-node {
  position: absolute;
  left: -28px;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--lime);
  transform: rotate(45deg);
}

.page-about .ab-tl summary {
  cursor: pointer;
  list-style: none;
  outline-offset: 4px;
}

.page-about .ab-tl summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-tl__head {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 10px 0 12px;
}

.page-about .ab-tl__year {
  font-family: var(--font-mono);
  font-size: clamp(30px, 6.8vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--lime);
}

.page-about .ab-tl__stage {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper-2);
}

.page-about .ab-tl__body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(242, 237, 227, .74);
}

/* ---------- 团队双栏 ---------- */

.page-about .ab-split {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .ab-lead {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .ab-body {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.8;
  color: #4C554F;
}

.page-about .ab-roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--ab-line-dark);
}

.page-about .ab-roles li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .ab-roles__k {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-roles__v {
  font-size: 14.5px;
  line-height: 1.74;
  color: #4C554F;
}

.page-about .ab-media {
  position: relative;
  margin: 0;
  background: var(--ink-3);
  border: 1px solid var(--ab-line-dark);
  clip-path: polygon(20px 0, 100% 0, 100% 100%, 0 100%, 0 20px);
  overflow: hidden;
}

.page-about .ab-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .ab-media__cap {
  padding: 12px 16px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(242, 237, 227, .7);
  background: var(--ink-3);
  border-top: 1px solid var(--ab-line-soft);
}

/* ---------- 天山通栏 ---------- */

.page-about .section--cold {
  overflow: hidden;
}

.page-about .ab-ridge {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 52%;
  pointer-events: none;
  opacity: .85;
}

.page-about .ab-ridge svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .ab-coverage {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .ab-body--cold {
  color: rgba(242, 237, 227, .78);
}

.page-about .ab-city-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 20px;
  padding: 0;
}

.page-about .ab-city-list li {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  padding: 7px 13px;
  color: var(--lime);
  background: rgba(198, 255, 61, .08);
  border: 1px solid rgba(198, 255, 61, .34);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
}

.page-about .ab-inline-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(198, 255, 61, .5);
}

.page-about .ab-inline-link:hover {
  border-bottom-color: var(--lime);
}

.page-about .ab-map {
  margin: 0;
  border: 1px solid rgba(242, 237, 227, .18);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  overflow: hidden;
}

.page-about .ab-map img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 5;
  object-fit: cover;
}

/* ---------- 四条主线 ---------- */

.page-about .ab-lines {
  display: grid;
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
}

.page-about .ab-line {
  position: relative;
  overflow: hidden;
  background: var(--ink-3);
  padding: 28px 22px 32px;
  transition: background .28s var(--ease), transform .28s var(--ease);
}

.page-about .ab-line::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .32s var(--ease);
}

.page-about .ab-line:hover,
.page-about .ab-line:focus-within {
  background: #171D1A;
  transform: translateY(-4px);
}

.page-about .ab-line:hover::before,
.page-about .ab-line:focus-within::before {
  transform: scaleX(1);
}

.page-about .ab-line__idx {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--orange);
}

.page-about .ab-line__title {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--paper-2);
}

.page-about .ab-line__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 237, 227, .72);
}

/* ---------- 观察点 ---------- */

.page-about .ab-outposts {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--ab-line-dark);
}

.page-about .ab-outpost {
  padding: 24px 0;
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .ab-outpost__tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 5px 11px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ink);
  background: var(--paper-3);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about .ab-outpost__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 900;
  color: var(--ink);
}

.page-about .ab-outpost__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #4C554F;
}

/* ---------- 认可 ---------- */

.page-about .ab-credits__grid {
  display: grid;
  gap: 1px;
  background: var(--ab-line-soft);
  border: 1px solid var(--ab-line-soft);
}

.page-about .ab-credit-card {
  padding: clamp(26px, 4vw, 40px);
  background: var(--ink-3);
}

.page-about .ab-credit-card--paper {
  background: var(--lime);
  color: var(--ink);
}

.page-about .ab-credit-card__span {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: clamp(24px, 5.2vw, 34px);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--lime);
}

.page-about .ab-credit-card__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  max-width: 42ch;
}

.page-about .ab-credit-card:not(.ab-credit-card--paper) .ab-credit-card__text {
  color: rgba(242, 237, 227, .78);
}

.page-about .ab-credit-card--paper .ab-credit-card__text {
  color: var(--ink);
  font-weight: 500;
}

/* ---------- 索引筛选 ---------- */

.page-about .ab-index {
  margin-top: 22px;
  border-top: 1px solid var(--ab-line-dark);
}

.page-about .ab-index .idx-item {
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .ab-index__link {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 14px;
  align-items: baseline;
  padding: 16px 2px;
  text-decoration: none;
  color: inherit;
  transition: padding-left .24s var(--ease), color .24s var(--ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  padding-left: 12px;
  color: var(--ink);
}

.page-about .ab-index__link .idx-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
}

.page-about .ab-index__link .idx-title {
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink-2);
}

.page-about .ab-index__link .idx-meta {
  grid-column: 2;
  font-size: 13px;
  color: #6B736D;
}

/* ---------- 收尾 ---------- */

.page-about .ab-cta {
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .ab-cta__box {
  padding: clamp(28px, 5vw, 52px);
  background: var(--lime);
  color: var(--ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .ab-cta__title {
  margin: 0 0 14px;
  font-size: clamp(24px, 4.6vw, 38px);
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .ab-cta__text {
  margin: 0 0 24px;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(11, 14, 13, .78);
}

.page-about .ab-cta__btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-cta__box .btn--install {
  background: var(--ink);
  color: var(--lime);
}

.page-about .ab-cta__box .btn--ghost {
  color: var(--ink);
  border-color: rgba(11, 14, 13, .36);
}

.page-about .ab-cta__box .btn--ghost:hover {
  border-color: var(--ink);
}

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .ab-roles li {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 620px) {
  .page-about .ab-lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-credits__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .ab-index__link {
    grid-template-columns: 40px minmax(0, 1fr) auto;
    gap: 4px 18px;
  }
  .page-about .ab-index__link .idx-meta {
    grid-column: 3;
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.38fr) minmax(300px, .86fr);
    align-items: end;
  }

  .page-about .ab-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    padding: 0;
    border-left: 0;
    border-top: 1px solid var(--ab-line-soft);
  }

  .page-about .ab-tl-item {
    padding: 28px 26px 8px 0;
    border-right: 1px solid var(--ab-line-soft);
  }

  .page-about .ab-tl-item + .ab-tl-item {
    padding-left: 26px;
  }

  .page-about .ab-tl-item:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .ab-tl-node {
    left: 0;
    top: -2px;
    width: 34px;
    height: 2px;
    transform: none;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: start;
  }

  .page-about .ab-coverage {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
    align-items: center;
  }

  .page-about .ab-outposts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 34px;
    border-top: 0;
  }

  .page-about .ab-outpost {
    border-top: 1px solid var(--ab-line-dark);
    padding: 26px 0 28px;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-lines {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-line,
  .page-about .ab-index__link,
  .page-about .ab-line::before {
    transition: none;
  }
  .page-about .ab-line:hover,
  .page-about .ab-line:focus-within {
    transform: none;
  }
}
<<<END>>>