.page-about {
  --ab-lift: -3px;
  --ab-shadow: 0 14px 30px rgba(14, 26, 43, .10);
  --ab-shadow-hi: 0 22px 40px rgba(19, 19, 19, .17);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  background: var(--night);
  color: var(--paper);
  overflow: hidden;
  padding: clamp(36px, 7vw, 92px) 0 clamp(78px, 11vw, 140px);
}

.page-about .ab-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .ab-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 72% 44%;
  opacity: .48;
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(104deg, rgba(14, 26, 43, .96) 0%, rgba(14, 26, 43, .84) 44%, rgba(14, 26, 43, .5) 100%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: clamp(30px, 5vw, 66px);
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 40%, 100% 100%);
  z-index: 2;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 3;
}

.page-about .ab-hero .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .12em;
  color: rgba(245, 239, 228, .62);
  margin: 0 0 clamp(18px, 3vw, 30px);
}

.page-about .ab-hero .crumbs a {
  color: rgba(245, 239, 228, .9);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 19, .55);
  padding-bottom: 1px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .ab-hero .crumbs a:hover {
  color: var(--flame);
  border-color: var(--flame);
}

.page-about .ab-hero .eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--flame);
}

.page-about .ab-hero h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(33px, 6.2vw, 74px);
  line-height: 1.06;
  letter-spacing: -.02em;
  margin: 0 0 clamp(18px, 2.6vw, 28px);
  max-width: 17ch;
}

.page-about .ab-hero__lede {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.85;
  color: rgba(245, 239, 228, .86);
  max-width: 48ch;
  margin: 0 0 clamp(28px, 4.4vw, 48px);
}

.page-about .ab-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(245, 239, 228, .16);
  border: 1px solid rgba(245, 239, 228, .16);
}

.page-about .ab-hero__stats li {
  background: rgba(14, 26, 43, .74);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-hero__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1;
  color: var(--flame);
}

.page-about .ab-hero__lab {
  font-size: 12px;
  letter-spacing: .12em;
  color: rgba(245, 239, 228, .7);
}

/* ---------- 通用分区 ---------- */
.page-about .ab-sec {
  padding: clamp(52px, 8vw, 108px) 0;
}

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

.page-about .ab-sec--sand {
  background: var(--paper-2);
  color: var(--ink);
}

.page-about .ab-sec--night {
  background: var(--night);
  color: var(--paper);
}

.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
}

.page-about .ab-split__side {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .ab-split__main {
  min-width: 0;
}

.page-about .ab-h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 3.3vw, 39px);
  line-height: 1.2;
  letter-spacing: -.02em;
  margin: 0 0 clamp(14px, 2vw, 22px);
  color: var(--ink);
}

.page-about .ab-sec--night .ab-h2,
.page-about .ab-cta .ab-h2 {
  color: var(--paper);
}

.page-about .ab-lead {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--grayblue);
  max-width: 52ch;
  margin: 0 0 clamp(22px, 3.4vw, 36px);
}

.page-about .ab-lead--night {
  color: rgba(245, 239, 228, .78);
}

.page-about .ab-side-note {
  margin: 0;
  color: var(--grayblue);
  line-height: 1.9;
}

.page-about .ab-sec--night .ab-side-note {
  color: rgba(245, 239, 228, .6);
}

/* ---------- 大编号 ---------- */
.page-about .ab-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(52px, 8vw, 92px);
  line-height: .78;
  letter-spacing: -.04em;
  color: var(--ochre);
}

.page-about .ab-num::after {
  content: "";
  display: block;
  width: 46px;
  height: 4px;
  margin-top: 14px;
  background: var(--flame);
  transform: skewX(-16deg);
}

.page-about .ab-sec--night .ab-num {
  color: var(--flame);
}

.page-about .ab-num--inline {
  margin-bottom: 16px;
}

/* ---------- 纸卡 ---------- */
.page-about .ab-card {
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: 10px 10px 0 rgba(180, 96, 58, .2);
  padding: clamp(16px, 2.4vw, 22px);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s var(--ease);
}

.page-about .ab-card:hover {
  transform: translateY(var(--ab-lift));
  border-color: var(--ochre-deep);
  box-shadow: 12px 16px 0 rgba(180, 96, 58, .26);
}

.page-about .ab-card__k {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--flame);
}

.page-about .ab-card__v {
  margin: 0;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--flame) 0%, rgba(180, 96, 58, .35) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding-bottom: clamp(26px, 4vw, 42px);
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--flame);
  transition: transform .22s var(--ease), background .22s var(--ease);
}

.page-about .ab-tl__item:last-child::before {
  background: var(--flame);
}

.page-about .ab-tl__item:hover::before {
  transform: scale(1.3);
  background: var(--flame);
}

.page-about .ab-tl__year {
  margin: 0 0 6px;
  font-size: 14px;
  letter-spacing: .16em;
  color: var(--ochre-deep);
}

.page-about .ab-tl__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.35;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .ab-tl__text {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 8px;
  max-width: 54ch;
}

.page-about .ab-tl__note {
  margin: 0;
  color: var(--grayblue);
  transition: color .22s var(--ease);
}

.page-about .ab-tl__item:hover .ab-tl__note {
  color: var(--ochre);
}

/* ---------- 数据流程 ---------- */
.page-about .ab-steps {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .ab-step {
  border: 1px solid var(--paper-line);
  background: rgba(245, 239, 228, .05);
  transition: border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .ab-step[open] {
  border-color: var(--flame);
  background: rgba(255, 106, 19, .09);
}

.page-about .ab-step summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  color: var(--paper);
}

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

.page-about .ab-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--flame);
}

.page-about .ab-step[open] summary::after {
  content: "–";
}

.page-about .ab-step__n {
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--flame);
}

.page-about .ab-step__body {
  padding: 0 18px 18px;
}

.page-about .ab-step__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 239, 228, .82);
}

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

.page-about .ab-shot img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--rule);
  box-shadow: 0 18px 40px rgba(0, 0, 0, .34);
}

.page-about .ab-sec--night .figure-cap {
  color: rgba(245, 239, 228, .6);
  margin-top: 10px;
}

/* ---------- 覆盖范围数字 ---------- */
.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .ab-figure {
  background: var(--paper-2);
  padding: clamp(16px, 2.6vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background .22s var(--ease);
}

.page-about .ab-figure:hover {
  background: var(--flame-soft);
}

.page-about .ab-figure__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1;
  color: var(--ochre-deep);
}

.page-about .ab-figure__lab {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

.page-about .ab-reach__text p {
  font-family: var(--font-body);
}

/* ---------- 旧版区块 ---------- */
.page-about .ab-legacy {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4.4vw, 52px);
  align-items: center;
}

.page-about .ab-legacy__shot {
  padding: 0 clamp(10px, 2vw, 22px) clamp(10px, 2vw, 22px) 0;
}

.page-about .ab-legacy__shot img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--ochre-deep);
  box-shadow: 14px 14px 0 rgba(180, 96, 58, .22);
}

.page-about .ab-legacy__link {
  display: inline-block;
  margin-top: clamp(14px, 2vw, 22px);
  font-size: 15px;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 44px);
  align-items: start;
}

.page-about .ab-team__text p {
  font-family: var(--font-body);
}

.page-about .ab-roster {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.page-about .ab-roster__item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--rule-soft);
  transition: background .2s var(--ease), padding-left .2s var(--ease);
}

.page-about .ab-roster__item:hover {
  background: var(--paper-2);
  padding-left: 12px;
}

.page-about .ab-roster__n {
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--flame);
  min-width: 3.2ch;
}

.page-about .ab-roster__t {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  color: var(--ink);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  position: relative;
  background: var(--night);
  color: var(--paper);
  padding: clamp(54px, 8vw, 100px) 0;
}

.page-about .ab-cta::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--flame) 0%, var(--ochre) 58%, rgba(180, 96, 58, 0) 100%);
}

.page-about .ab-cta__inner {
  max-width: 62ch;
}

.page-about .ab-cta__text {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: rgba(245, 239, 228, .82);
  margin: 0 0 clamp(22px, 3vw, 34px);
}

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

.page-about .ab-cta .btn--ghost {
  color: var(--paper);
  border-color: rgba(245, 239, 228, .42);
}

.page-about .ab-cta .btn--ghost:hover {
  color: var(--night);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-tl__text {
    font-size: 17px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
    align-items: start;
  }

  .page-about .ab-split__side {
    position: sticky;
    top: 28px;
  }

  .page-about .ab-legacy {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1fr);
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__lede {
    font-size: 19px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-card,
  .page-about .ab-card:hover,
  .page-about .ab-tl__item::before,
  .page-about .ab-tl__item:hover::before,
  .page-about .ab-roster__item,
  .page-about .ab-roster__item:hover,
  .page-about .ab-step,
  .page-about .ab-figure {
    transform: none;
    transition: none;
  }
}
</final>