.page-about {
  --ab-section-pad: clamp(48px, 7vw, 104px);
  --ab-line-strong: rgba(0, 230, 184, .38);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: clamp(14px, 2.4vw, 26px);
  font-size: 13px;
  color: var(--muted);
}
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .crumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 64px) 0 clamp(32px, 5vw, 64px);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -2px;
  background-image:
    linear-gradient(rgba(27, 58, 46, .55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 58, 46, .55) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(155deg, #000 18%, transparent 76%);
  mask-image: linear-gradient(155deg, #000 18%, transparent 76%);
  pointer-events: none;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(660px 360px at 90% 4%, rgba(0, 230, 184, .17), transparent 70%),
    radial-gradient(520px 320px at 2% 98%, rgba(255, 75, 43, .12), transparent 72%);
  pointer-events: none;
}
.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: end;
}
@media (min-width: 940px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  }
}
.page-about .ab-hero__copy .eyebrow {
  margin: 0 0 14px;
}
.page-about .ab-hero__copy .h-display {
  margin: 0 0 20px;
  max-width: 18ch;
}
.page-about .ab-hero__copy .h-display em {
  font-style: normal;
  color: var(--cyan);
}
.page-about .ab-hero__copy .h-display .num {
  color: var(--cyan-soft);
  font-size: .92em;
}
.page-about .ab-hero__copy .lead {
  max-width: 56ch;
  margin: 0 0 26px;
}
.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-about .ab-hero__stats .metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(12px, 2vw, 20px) clamp(10px, 1.6vw, 16px);
  background: linear-gradient(180deg, var(--panel) 0%, var(--ink-2) 100%);
}
.page-about .ab-hero__stats .metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.02em;
}
.page-about .ab-hero__stats .metric__label {
  font-size: 12px;
  line-height: 1.55;
  color: var(--muted);
}
@media (max-width: 460px) {
  .page-about .ab-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  position: sticky;
  top: 0;
  z-index: 6;
  background: rgba(4, 18, 12, .9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-index__inner ol {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .ab-index__inner ol::-webkit-scrollbar {
  display: none;
}
.page-about .ab-index__inner a {
  display: block;
  padding: 12px 14px;
  font-size: 13px;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.page-about .ab-index__inner a:hover {
  color: var(--white);
  background: var(--cyan-dim);
}
.page-about .ab-index__inner a.is-current {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 成长线 ---------- */
.page-about .ab-timeline {
  position: relative;
  padding: var(--ab-section-pad) 0;
  overflow: hidden;
}
.page-about .ab-timeline__bg {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: .16;
  pointer-events: none;
}
.page-about .ab-timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.6) hue-rotate(110deg);
}
.page-about .ab-timeline__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ink) 0%, rgba(4, 18, 12, .4) 40%, var(--ink) 100%);
}
.page-about .ab-timeline .wrap {
  position: relative;
  z-index: 1;
}

.page-about .ab-track {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  border-left: 1px solid var(--line);
}
@media (min-width: 780px) {
  .page-about .ab-track {
    padding-left: 52px;
  }
}
.page-about .ab-track__item {
  position: relative;
  padding-bottom: clamp(30px, 4.6vw, 52px);
}
.page-about .ab-track__item:last-child {
  padding-bottom: 0;
}
.page-about .ab-track__item::before {
  content: "";
  position: absolute;
  top: 9px;
  left: -34px;
  width: 11px;
  height: 11px;
  background: var(--cyan);
  border: 2px solid var(--ink);
  transition: transform .25s var(--ease), background-color .25s var(--ease);
}
@media (min-width: 780px) {
  .page-about .ab-track__item::before {
    left: -58px;
  }
}
.page-about .ab-track__item:hover::before {
  transform: scale(1.35);
  background: var(--cyan-soft);
}
.page-about .ab-track__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cyan);
  line-height: 1;
}
.page-about .ab-track__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}
.page-about .ab-track__item p:not(.ab-track__year) {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--silver);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding: var(--ab-section-pad) 0;
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 50%, var(--ink) 100%);
}
.page-about .ab-team__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
  margin-bottom: clamp(32px, 5vw, 56px);
}
@media (min-width: 900px) {
  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(32px, 5vw, 64px);
  }
}
.page-about .ab-team__copy p {
  margin: 0 0 14px;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--silver);
}
.page-about .ab-team__copy p:last-child {
  margin-bottom: 0;
}
.page-about .ab-team__media .media__caption {
  padding: 10px 12px;
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-roles__bar {
  display: flex;
  height: 12px;
  margin-bottom: 6px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  overflow: hidden;
}
.page-about .ab-roles__seg {
  display: block;
  height: 100%;
}
.page-about .ab-roles__seg--1 { flex: 22 1 0; background: var(--cyan); }
.page-about .ab-roles__seg--2 { flex: 11 1 0; background: var(--cyan-soft); }
.page-about .ab-roles__seg--3 { flex: 9 1 0; background: var(--amber); }
.page-about .ab-roles__seg--4 { flex: 4 1 0; background: var(--orange); }

.page-about .ab-roles__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  background: var(--line-soft);
}
@media (min-width: 700px) {
  .page-about .ab-roles__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1040px) {
  .page-about .ab-roles__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .ab-roles__card {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--panel);
  transition: background-color .24s var(--ease);
}
.page-about .ab-roles__card:hover {
  background: var(--panel-2);
}
.page-about .ab-roles__card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 26px;
  height: 2px;
}
.page-about .ab-roles__card--1::after { background: var(--cyan); }
.page-about .ab-roles__card--2::after { background: var(--cyan-soft); }
.page-about .ab-roles__card--3::after { background: var(--amber); }
.page-about .ab-roles__card--4::after { background: var(--orange); }
.page-about .ab-roles__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}
.page-about .ab-roles__card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
}
.page-about .ab-roles__card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 流程 ---------- */
.page-about .ab-process {
  padding: var(--ab-section-pad) 0;
}
.page-about .ab-flow {
  position: relative;
  margin-top: clamp(24px, 4vw, 40px);
}
.page-about .ab-flow__svg {
  display: none;
  width: 100%;
  height: 64px;
  margin-bottom: -14px;
}
@media (min-width: 900px) {
  .page-about .ab-flow__svg {
    display: block;
  }
}
.page-about .ab-flow__steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  background: var(--line-soft);
}
@media (min-width: 620px) {
  .page-about .ab-flow__steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 900px) {
  .page-about .ab-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .ab-flow__step {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--panel);
}
.page-about .ab-flow__no {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--cyan);
}
.page-about .ab-flow__step h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}
.page-about .ab-flow__step p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}
.page-about .ab-process .note {
  display: block;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 74ch;
}

/* ---------- 跑动读法 ---------- */
.page-about .ab-running {
  padding: var(--ab-section-pad) 0;
  background: var(--ink-2);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-running__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
  margin-top: clamp(24px, 4vw, 40px);
}
@media (min-width: 960px) {
  .page-about .ab-running__grid {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
  }
}
.page-about .ab-running__figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  background: var(--panel);
}
.page-about .ab-running__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.75) hue-rotate(110deg);
}
.page-about .ab-running__figure .media__caption {
  padding: 10px 12px;
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-running__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
@media (min-width: 720px) {
  .page-about .ab-running__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .ab-running__col {
  padding: clamp(20px, 3vw, 32px);
  background: var(--panel);
}
.page-about .ab-running__col--alt {
  background: linear-gradient(160deg, var(--panel-2) 0%, var(--panel) 100%);
}
.page-about .ab-running__col .tag {
  margin-bottom: 14px;
}
.page-about .ab-running__title {
  margin: 0 0 12px;
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}
.page-about .ab-running__col > p:not(.tag) {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver);
}
.page-about .ab-running__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-running__list li {
  position: relative;
  padding: 10px 0 10px 18px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--silver);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-running__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}
.page-about .ab-running__col--alt .ab-running__list li::before {
  background: var(--amber);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco {
  padding: var(--ab-section-pad) 0;
}
.page-about .ab-eco__grid {
  margin-top: clamp(24px, 4vw, 40px);
}
.page-about .ab-eco__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 26px);
}
.page-about .ab-eco__card .tag {
  align-self: flex-start;
}
.page-about .ab-eco__card h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}
.page-about .ab-eco__card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .ab-eco__partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(24px, 4vw, 36px);
  padding: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
@media (min-width: 660px) {
  .page-about .ab-eco__partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .ab-eco__partner {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--panel);
}
.page-about .ab-eco__partner-num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.02em;
}
.page-about .ab-eco__partner-label {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-eco__cta {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  margin-top: clamp(28px, 4.4vw, 44px);
  padding: clamp(22px, 3.4vw, 36px);
  background:
    linear-gradient(135deg, rgba(0, 230, 184, .1) 0%, transparent 52%),
    var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
}
@media (min-width: 880px) {
  .page-about .ab-eco__cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}
.page-about .ab-eco__cta p {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.7;
  color: var(--white);
}
.page-about .ab-eco__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-track__item::before,
  .page-about .ab-roles__card,
  .page-about .ab-index__inner a,
  .page-about .crumbs a {
    transition: none;
  }
  .page-about .ab-track__item:hover::before {
    transform: none;
  }
}