.page-about {
  --ab-rail-w: 208px;
  background: var(--ink);
  color: var(--bone);
  padding-bottom: clamp(48px, 8vw, 96px);
  font-family: var(--sans);
}

/* ===== 面包屑 ===== */
.page-about .ab-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: clamp(16px, 3vw, 26px);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fog);
}
.page-about .ab-crumb a {
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .ab-crumb a:hover,
.page-about .ab-crumb a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.page-about .ab-crumb__sep {
  color: var(--rule);
}

/* ===== 首屏 ===== */
.page-about .ab-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 48px);
  padding-top: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(36px, 6vw, 72px);
  border-bottom: 1px solid var(--rule);
}
@media (min-width: 920px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }
}
.page-about .ab-hero__title {
  margin: 14px 0 20px;
  max-width: 16em;
  font-size: clamp(32px, 5.4vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--bone);
}
.page-about .ab-hero__lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.8;
  color: var(--fog);
}
.page-about .ab-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .ab-hero__fig {
  margin: 0 0 16px;
  border: 1px solid var(--rule);
  background: var(--ink-2);
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.page-about .ab-hero__fig img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
}
.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px 16px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.page-about .ab-stat .num {
  font-family: var(--mono);
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}
.page-about .ab-stat__k {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

/* ===== 分屏骨架 ===== */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}
@media (min-width: 1000px) {
  .page-about .ab-shell {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }
}
.page-about .ab-rail {
  padding: 22px 0 10px;
  border-bottom: 1px solid var(--rule);
}
.page-about .ab-rail__k {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--lime);
}
.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}
.page-about .ab-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--rule);
  color: var(--fog);
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .ab-rail__list a .num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--lime-2);
}
.page-about .ab-rail__list a:hover,
.page-about .ab-rail__list a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}
@media (min-width: 1000px) {
  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--head-h) + 28px);
    align-self: start;
    padding: 44px 20px 40px 0;
    border-bottom: 0;
    border-right: 1px solid var(--rule);
    max-height: calc(100vh - var(--head-h) - 56px);
    overflow-y: auto;
  }
  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .ab-rail__list a {
    white-space: normal;
    border: 0;
    border-bottom: 1px solid var(--rule);
    padding: 12px 8px 12px 0;
    line-height: 1.6;
  }
  .page-about .ab-rail__list a:hover,
  .page-about .ab-rail__list a:focus-visible {
    border-bottom-color: var(--lime);
  }
}

.page-about .ab-flow {
  min-width: 0;
}
.page-about .ab-sec {
  padding: clamp(32px, 5vw, 64px) 0;
  border-top: 1px solid var(--rule);
}
.page-about .ab-sec:first-child {
  border-top: 0;
}

/* ===== 分区标题 ===== */
.page-about .ab-sec__head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(24px, 4vw, 42px);
}
.page-about .ab-sec__idx {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--lime);
}
.page-about .ab-sec__title {
  margin: 0;
  max-width: 18em;
  font-size: clamp(25px, 3.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--bone);
}
.page-about .ab-sec__note {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fog);
}

/* ===== 正文 ===== */
.page-about .ab-prose p {
  margin: 0 0 1.1em;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--fog);
}
.page-about .ab-prose p:last-child {
  margin-bottom: 0;
}
.page-about .ab-prose--tight {
  margin-top: clamp(18px, 2.6vw, 28px);
  padding-top: clamp(16px, 2.4vw, 24px);
  border-top: 1px solid var(--rule);
}
.page-about .ab-prose a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--lime-2);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .ab-prose a:hover,
.page-about .ab-prose a:focus-visible {
  color: var(--bone);
  border-bottom-color: var(--bone);
}

/* ===== 图带 ===== */
.page-about .ab-band {
  margin: 0 0 clamp(22px, 3.4vw, 36px);
  border: 1px solid var(--rule);
  background: var(--ink-2);
}
.page-about .ab-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ===== 时间线 ===== */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 14px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(206px, 1fr);
  overflow-x: auto;
  border-top: 1px solid var(--rule);
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}
.page-about .ab-timeline::-webkit-scrollbar {
  height: 6px;
}
.page-about .ab-timeline::-webkit-scrollbar-thumb {
  background: var(--rule);
}
.page-about .ab-tl {
  position: relative;
  padding: 28px 20px 20px 0;
  border-right: 1px solid var(--rule);
  scroll-snap-align: start;
}
.page-about .ab-tl:last-child {
  border-right: 0;
  padding-right: 0;
}
.page-about .ab-tl::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 2px;
  height: 10px;
  background: var(--lime-2);
}
.page-about .ab-tl--now::before {
  width: 3px;
  height: 20px;
  background: var(--orange);
}
.page-about .ab-tl__v {
  display: inline-block;
  padding: 3px 7px;
  border: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--lime);
}
.page-about .ab-tl--now .ab-tl__v {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}
.page-about .ab-tl__t {
  margin: 12px 0 8px;
  font-size: 16px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--bone);
}
.page-about .ab-tl__d {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--fog);
}

/* ===== 暖纸白对照区 ===== */
.page-about .ab-paper {
  background: var(--paper);
  color: var(--paper-ink);
  padding: clamp(22px, 3.6vw, 44px);
}
.page-about .ab-cmp {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}
@media (min-width: 860px) {
  .page-about .ab-cmp {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .ab-cmp__item {
  border-top: 1px solid rgba(18, 36, 28, 0.18);
  padding-top: 16px;
}
.page-about .ab-cmp__t {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper-ink);
}
.page-about .ab-pair {
  display: grid;
  gap: 1px;
  background: rgba(18, 36, 28, 0.16);
}
@media (min-width: 560px) {
  .page-about .ab-pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .ab-pair__cell {
  background: var(--paper);
  padding: 14px 16px;
}
.page-about .ab-pair__cell--now {
  background: #FBF8EE;
}
.page-about .ab-pair__k {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(18, 36, 28, 0.62);
}
.page-about .ab-sq {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 6px;
  background: var(--orange);
}
.page-about .ab-pair__cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(18, 36, 28, 0.84);
}
.page-about .ab-paper__foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(18, 36, 28, 0.16);
  max-width: 60em;
  font-size: 13px;
  line-height: 1.72;
  color: rgba(18, 36, 28, 0.72);
}

/* ===== 可展开指标组 ===== */
.page-about .ab-acc {
  border-bottom: 1px solid var(--rule);
}
.page-about .ab-acc:first-of-type {
  border-top: 1px solid var(--rule);
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .ab-acc summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--bone);
  transition: color 0.2s var(--ease);
}
.page-about .ab-acc summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-acc summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime);
}
.page-about .ab-acc[open] summary::after {
  content: "−";
}
.page-about .ab-acc summary:hover,
.page-about .ab-acc summary:focus-visible {
  color: var(--lime);
}
.page-about .ab-acc__n {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime-2);
}
.page-about .ab-acc__body {
  padding: 0 0 18px;
}
.page-about .ab-acc__body p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--fog);
}

/* ===== 团队 ===== */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}
@media (min-width: 860px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.78fr);
    align-items: start;
  }
}
.page-about .ab-team__col {
  min-width: 0;
}
.page-about .ab-roles {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
}
.page-about .ab-role {
  border-top: 1px solid var(--rule);
  padding-top: 16px;
  margin-top: 16px;
}
.page-about .ab-role:first-child {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}
.page-about .ab-role__h {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--bone);
}
.page-about .ab-role__h .num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
}
.page-about .ab-role p {
  margin: 0;
  max-width: 36em;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--fog);
}
.page-about .ab-team__fig {
  margin: 0;
  border: 1px solid var(--rule);
  background: var(--ink-2);
  aspect-ratio: 1 / 1;
  overflow: hidden;
}
.page-about .ab-team__fig img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== 站点信息 ===== */
.page-about .ab-meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
@media (min-width: 640px) {
  .page-about .ab-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .ab-meta__cell {
  background: var(--ink-2);
  padding: 18px 20px 20px;
}
.page-about .ab-meta__k {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
}
.page-about .ab-meta__v {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--bone);
  word-break: break-word;
}
.page-about .ab-meta__v .num {
  font-family: var(--mono);
  letter-spacing: 0.02em;
}
.page-about .ab-copy {
  margin-top: 10px;
  padding: 5px 10px;
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--fog);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .ab-copy:hover,
.page-about .ab-copy:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}
.page-about .ab-copy[data-copied] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .ab-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-crumb a,
  .page-about .ab-rail__list a,
  .page-about .ab-prose a,
  .page-about .ab-acc summary,
  .page-about .ab-copy {
    transition: none;
  }
  .page-about .ab-copy[data-copied] {
    background: var(--lime);
  }
}
<<<END>>>