.page-about {
  --ab-cut: 20px;
  --ab-gap: clamp(20px, 4vw, 32px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(30px, 5vw, 64px);
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(154deg, rgba(227, 178, 60, .16) 0%, rgba(227, 178, 60, 0) 44%),
    linear-gradient(206deg, rgba(47, 155, 224, .10) 0%, rgba(47, 155, 224, 0) 52%);
  clip-path: polygon(0 0, 100% 0, 100% 74%, 0 100%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: 10%;
  width: 52%;
  height: 200px;
  background: linear-gradient(100deg, rgba(227, 178, 60, .14), rgba(227, 178, 60, 0));
  transform: skewY(-9deg);
  pointer-events: none;
}

.page-about .ab-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-hero-copy .display {
  margin: 14px 0 0;
  color: var(--c-bone);
}

.page-about .ab-hero-copy .lede {
  margin-top: 18px;
  color: rgba(243, 239, 230, .84);
}

.page-about .ab-hero-p {
  margin-top: 16px;
  max-width: 60ch;
  color: var(--c-mist);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 图片容器 */
.page-about .ab-shot {
  margin: 0;
  overflow: hidden;
  background: var(--c-ink-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
}

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

.page-about .ab-shot--hero {
  border-top: 3px solid var(--c-gold);
}

.page-about .ab-shot--square {
  margin-top: clamp(28px, 4vw, 48px);
  max-width: 420px;
  border-left: 2px solid var(--c-blue);
}

.page-about .ab-shot--wide {
  margin-top: clamp(28px, 4vw, 44px);
  border-bottom: 3px solid var(--c-blue);
}

/* 首屏数字 */
.page-about .ab-hero-stats {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-about .ab-hero-stats li {
  background: var(--c-ink);
  padding: 18px 14px 20px;
}

.page-about .ab-stat-num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--c-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stat-label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-sm);
  line-height: 1.55;
  color: var(--c-mist);
}

/* ---------- 通用小标题组 ---------- */
.page-about .ab-head {
  max-width: 68ch;
}

.page-about .ab-head-p {
  margin-top: 14px;
  color: var(--c-mist);
  font-size: var(--fs-body);
  line-height: 1.75;
}

/* ---------- 流程 ---------- */
.page-about .ab-flow .ab-steps {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .ab-flow .ab-steps::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-gold), var(--c-moss) 56%, var(--c-clay));
  transform: skewX(-5deg);
  opacity: .75;
}

.page-about .ab-step {
  position: relative;
  padding: 0 0 30px 52px;
}

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

.page-about .ab-step::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 6px;
  width: 13px;
  height: 13px;
  background: var(--c-ink-2);
  border: 2px solid var(--c-gold);
  transform: rotate(45deg);
}

.page-about .ab-step-idx {
  display: inline-block;
  font-family: var(--font-data);
  font-size: var(--fs-data);
  letter-spacing: .12em;
  color: var(--c-blue);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-step h3 {
  margin: 6px 0 8px;
  font-family: var(--font-head);
  font-size: var(--fs-h3);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--c-bone);
}

.page-about .ab-step p {
  margin: 0;
  max-width: 62ch;
  color: var(--c-mist);
  font-size: var(--fs-body);
  line-height: 1.75;
}

/* 分段切换 */
.page-about .ab-seg {
  margin-top: clamp(30px, 5vw, 52px);
}

.page-about .ab-seg .seg-btn {
  min-width: 132px;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: .02em;
}

.page-about .ab-seg .seg-panel-wrap {
  margin-top: 20px;
}

.page-about .ab-seg .seg-panel {
  border-left: 3px solid var(--c-gold);
  padding: 4px 0 4px 20px;
  max-width: 66ch;
}

.page-about .ab-seg .seg-panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: var(--fs-h3);
  font-weight: 800;
  color: var(--c-gold-soft);
}

.page-about .ab-seg .seg-panel p {
  margin: 0;
  color: rgba(243, 239, 230, .82);
  font-size: var(--fs-body);
  line-height: 1.75;
}

/* ---------- 团队 ---------- */
.page-about .ab-team-bar {
  display: flex;
  height: 46px;
  margin: clamp(28px, 4vw, 46px) 0 26px;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, calc(100% - 18px) 100%, 0 100%);
}

.page-about .ab-team-seg {
  display: block;
  height: 100%;
  transition: transform .24s var(--ease);
}

.page-about .ab-team-seg--data {
  flex: 6;
  background: var(--c-gold);
}

.page-about .ab-team-seg--tactic {
  flex: 5;
  background: var(--c-blue);
}

.page-about .ab-team-seg--city {
  flex: 4;
  background: var(--c-moss);
}

.page-about .ab-team-seg--ops {
  flex: 3;
  background: var(--c-clay);
}

.page-about .ab-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-team-item {
  border-left: 3px solid var(--c-rock);
  padding: 4px 0 4px 18px;
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .ab-team-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: var(--fs-h3);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--c-bone);
}

.page-about .ab-team-item h3 .data-num {
  color: var(--c-gold);
  font-size: 18px;
}

.page-about .ab-team-item p {
  margin: 0;
  max-width: 62ch;
  color: var(--c-mist);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-about .ab-team-item--data:hover,
.page-about .ab-team-item--data:focus-within {
  border-left-color: var(--c-gold);
  transform: translateX(4px);
}

.page-about .ab-team-item--tactic:hover,
.page-about .ab-team-item--tactic:focus-within {
  border-left-color: var(--c-blue);
  transform: translateX(4px);
}

.page-about .ab-team-item--city:hover,
.page-about .ab-team-item--city:focus-within {
  border-left-color: var(--c-moss);
  transform: translateX(4px);
}

.page-about .ab-team-item--ops:hover,
.page-about .ab-team-item--ops:focus-within {
  border-left-color: var(--c-clay);
  transform: translateX(4px);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--c-gold), var(--c-blue) 42%, var(--c-moss) 72%, var(--c-clay));
  transform: skewX(-7deg);
}

.page-about .ab-node {
  position: relative;
  padding: 0 0 32px 46px;
}

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

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 9px;
  width: 12px;
  height: 12px;
  background: var(--c-ink-2);
  border: 2px solid var(--c-gold);
  transform: rotate(45deg);
}

.page-about .ab-node-year {
  margin: 0;
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--c-gold);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-node h3 {
  margin: 8px 0 8px;
  font-family: var(--font-head);
  font-size: var(--fs-h3);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--c-bone);
}

.page-about .ab-node > p:not(.ab-node-year) {
  margin: 0;
  max-width: 62ch;
  color: var(--c-mist);
  font-size: var(--fs-body);
  line-height: 1.75;
}

/* ---------- 三城球市 ---------- */
.page-about .ab-city-strip {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .ab-city-cell {
  border-top: 2px solid var(--c-blue);
  padding-top: 14px;
}

.page-about .ab-city-name {
  display: block;
  font-family: var(--font-head);
  font-size: var(--fs-h3);
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--c-gold-soft);
}

.page-about .ab-city-cell p {
  margin: 8px 0 0;
  color: var(--c-mist);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-about .ab-tiers {
  display: grid;
  gap: 16px;
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .ab-tier {
  padding: 22px 20px 24px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .ab-tier--moss {
  background: rgba(76, 107, 79, .34);
  border-left: 4px solid var(--c-moss);
}

.page-about .ab-tier--clay {
  background: rgba(179, 102, 60, .28);
  border-left: 4px solid var(--c-clay);
}

.page-about .ab-tier-kicker {
  margin: 0;
  font-family: var(--font-data);
  font-size: var(--fs-data);
  letter-spacing: .16em;
  color: var(--c-gold-soft);
}

.page-about .ab-tier h3 {
  margin: 10px 0 10px;
  font-family: var(--font-head);
  font-size: var(--fs-h3);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--c-bone);
}

.page-about .ab-tier p {
  margin: 0;
  max-width: 56ch;
  color: rgba(243, 239, 230, .82);
  font-size: var(--fs-body);
  line-height: 1.75;
}

/* ---------- 协作 ---------- */
.page-about .ab-partners-grid {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-partners-copy p {
  margin: 14px 0 0;
  max-width: 64ch;
  color: var(--c-mist);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-about .ab-partners-copy .btn {
  margin-top: 24px;
}

.page-about .ab-partner-nums {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-about .ab-partner-nums li {
  background: var(--c-rock);
  padding: 18px 16px 20px;
}

/* ---------- 收尾 ---------- */
.page-about .ab-outro-inner {
  border-top: 3px solid var(--c-gold);
  padding-top: clamp(24px, 4vw, 36px);
  max-width: 74ch;
}

.page-about .ab-outro-inner p {
  margin: 14px 0 0;
  color: var(--c-mist);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-about .ab-outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

  .page-about .ab-city-strip {
    flex-direction: row;
    align-items: flex-start;
    gap: 24px;
  }

  .page-about .ab-city-cell {
    flex: 1 1 0;
  }

  .page-about .ab-city-cell:nth-child(2) {
    flex-grow: 1.18;
  }

  .page-about .ab-city-cell:nth-child(3) {
    flex-grow: 1.32;
  }

  .page-about .ab-team-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 22px 30px;
  }

  .page-about .ab-tiers {
    grid-template-columns: 1.05fr .95fr;
  }

  .page-about .ab-partner-nums {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-about .ab-hero-grid {
    grid-template-columns: 1.12fr .88fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-hero-copy .display {
    font-size: var(--fs-display);
  }

  .page-about .ab-step {
    width: 62%;
  }

  .page-about .ab-step:nth-child(2) {
    width: 74%;
  }

  .page-about .ab-step:nth-child(3) {
    width: 58%;
  }

  .page-about .ab-step:nth-child(4) {
    width: 80%;
  }

  .page-about .ab-step:nth-child(5) {
    width: 66%;
  }

  .page-about .ab-flow .ab-shot--square {
    position: relative;
    margin-left: auto;
    margin-top: -120px;
    margin-right: 4%;
  }

  .page-about .ab-partners-grid {
    grid-template-columns: 1.25fr .75fr;
    gap: 56px;
    align-items: start;
  }
}

@media (max-width: 999px) {
  .page-about .ab-flow .ab-shot--square {
    margin-left: 0;
    margin-right: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team-seg,
  .page-about .ab-team-item {
    transition: none;
  }

  .page-about .ab-team-item:hover,
  .page-about .ab-team-item:focus-within {
    transform: none;
  }
}