.page-about {
  --ab-hair: rgba(53, 230, 216, 0.32);
  --ab-steel-soft: rgba(36, 48, 64, 0.78);
  --ab-glow: rgba(31, 91, 255, 0.26);
}

.page-about .crumb {
  margin-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 46px) 0 clamp(40px, 6vw, 80px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: 4%;
  right: -14%;
  width: 58vw;
  height: 58vw;
  max-width: 660px;
  max-height: 660px;
  background: radial-gradient(circle, var(--ab-glow), transparent 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

@media (min-width: 940px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 68px);
  }
}

.page-about .ab-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 6.4vw, 62px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .ab-hero__lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: var(--mist);
}

/* KPI 条 */
.page-about .ab-kpis {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--steel);
  border: 1px solid var(--steel);
  clip-path: var(--cut);
}

@media (min-width: 620px) {
  .page-about .ab-kpis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .ab-kpi {
  margin: 0;
  padding: 14px 16px 16px;
  background: var(--ink);
}

.page-about .ab-kpi__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .ab-kpi__value {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 33px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-kpi__value small {
  margin-left: 2px;
  font-size: 0.46em;
  color: var(--mist);
}

/* 首屏图 */
.page-about .ab-hero__media {
  margin: 0;
}

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

/* ---------- 通用区块 ---------- */
.page-about .ab-sec {
  padding: clamp(44px, 7vw, 88px) 0;
  border-top: 1px solid var(--ab-steel-soft);
}

.page-about .ab-sec--last {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .ab-sec__head {
  max-width: 74ch;
  margin-bottom: clamp(22px, 3.4vw, 42px);
}

.page-about .ab-sec__idx {
  display: block;
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .ab-sec__title {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(24px, 3.7vw, 38px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .ab-sec__sub {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 01 起点 ---------- */
.page-about .ab-intro__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 44px);
  align-items: start;
}

@media (min-width: 920px) {
  .page-about .ab-intro__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 72px);
  }
}

.page-about .ab-intro__text p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-intro__text p:last-child {
  margin-bottom: 0;
}

.page-about .ab-intro__panel {
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .ab-intro__panel-title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 17px;
  color: var(--white);
}

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

.page-about .ab-intro__list li {
  padding-top: 12px;
  border-top: 1px solid var(--ab-steel-soft);
}

.page-about .ab-intro__list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-intro__li-label {
  display: block;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--white);
}

.page-about .ab-intro__li-note {
  display: block;
  margin-top: 4px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 02 时间线 ---------- */
.page-about .ab-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.6vw, 28px);
  margin: 0;
  padding: 0 0 0 36px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(53, 230, 216, 0.18) 55%, rgba(53, 230, 216, 0.03) 100%);
}

.page-about .ab-tl {
  position: relative;
  min-width: 0;
}

.page-about .ab-tl__dot {
  position: absolute;
  left: -35px;
  top: 24px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--cyan);
  background: var(--ink);
  transform: rotate(45deg);
  z-index: 2;
}

.page-about .ab-tl__card {
  padding: clamp(16px, 2vw, 22px) clamp(18px, 2.2vw, 24px) clamp(18px, 2.2vw, 22px);
}

.page-about .ab-tl__tag {
  display: inline-block;
  padding: 3px 9px;
  border: 1px solid var(--ab-hair);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .ab-tl__title {
  margin: 12px 0 7px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 2.1vw, 21px);
  line-height: 1.36;
  color: var(--white);
}

.page-about .ab-tl__desc {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--mist);
}

@media (min-width: 940px) {
  .page-about .ab-timeline {
    padding-left: 0;
    gap: clamp(20px, 2.4vw, 34px);
  }

  .page-about .ab-timeline::before {
    left: 50%;
    margin-left: -1px;
  }

  .page-about .ab-tl {
    width: calc(50% - 48px);
  }

  .page-about .ab-tl:nth-child(odd) {
    margin-right: auto;
  }

  .page-about .ab-tl:nth-child(even) {
    margin-left: auto;
  }

  .page-about .ab-tl__dot {
    left: auto;
    top: 26px;
  }

  .page-about .ab-tl:nth-child(odd) .ab-tl__dot {
    right: -56px;
  }

  .page-about .ab-tl:nth-child(even) .ab-tl__dot {
    left: -56px;
  }
}

/* ---------- 03 团队 ---------- */
.page-about .ab-team {
  align-items: start;
  gap: clamp(22px, 3.2vw, 40px);
}

.page-about .ab-team__body {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .ab-role {
  padding: clamp(18px, 2.2vw, 24px);
}

.page-about .ab-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ab-steel-soft);
}

.page-about .ab-role__name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  color: var(--white);
}

.page-about .ab-role__count {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-role__count small {
  margin-left: 2px;
  font-size: 0.45em;
  color: var(--mist);
}

.page-about .ab-role__list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .ab-role__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .ab-role__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 9px;
  height: 2px;
  background: var(--cyan);
}

.page-about .ab-team__aside {
  display: grid;
  gap: 16px;
  align-content: start;
  padding: clamp(18px, 2.2vw, 24px);
  border: 1px solid var(--ab-steel-soft);
  background: var(--board);
  clip-path: var(--cut);
}

.page-about .ab-tagwall {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-tagwall .chip {
  appearance: none;
  margin: 0;
  padding: 7px 14px;
  border: 1px solid var(--steel);
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.4;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .ab-tagwall .chip:hover {
  border-color: var(--cyan);
  color: var(--white);
}

.page-about .ab-tagwall .chip.is-on {
  border-color: var(--cyan);
  background: rgba(53, 230, 216, 0.1);
  color: var(--cyan);
}

.page-about .ab-tagwall .chip:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .ab-tagwall__hint {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.74;
  color: var(--mist);
}

/* ---------- 04 流程 ---------- */
.page-about .ab-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--steel);
  border: 1px solid var(--steel);
  clip-path: var(--cut);
}

@media (min-width: 720px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .ab-flow {
    grid-template-columns: 1.15fr 1.15fr 1fr 0.95fr;
  }
}

.page-about .ab-flow__item {
  padding: clamp(18px, 2.2vw, 24px);
  background: var(--ink);
}

.page-about .ab-flow__num {
  display: block;
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-flow__title {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 18px;
  color: var(--white);
}

.page-about .ab-flow__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--mist);
}

/* 流程下方：图 + 纠错 */
.page-about .ab-source__foot {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(22px, 3vw, 34px);
}

@media (min-width: 920px) {
  .page-about .ab-source__foot {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: stretch;
  }
}

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

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

.page-about .ab-fix {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(20px, 2.8vw, 32px);
}

.page-about .ab-fix__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 22px);
  color: var(--white);
}

.page-about .ab-fix__text {
  margin: 0 0 12px;
  max-width: 54ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-fix__text:last-child {
  margin-bottom: 0;
}

.page-about .ab-fix__text .mono {
  color: var(--cyan);
  word-break: break-all;
}

/* ---------- 05 合作 ---------- */
.page-about .ab-partner__media {
  margin: 0 0 clamp(20px, 3vw, 32px);
  aspect-ratio: 3 / 2;
}

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

.page-about .ab-partner__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .ab-partner__tags .chip {
  appearance: none;
  margin: 0;
  padding: 7px 15px;
  border: 1px solid var(--steel);
  background: var(--board);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 13.5px;
  cursor: pointer;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .ab-partner__tags .chip:hover {
  border-color: var(--cyan);
  color: var(--white);
}

.page-about .ab-partner__tags .chip.is-on {
  border-color: var(--cyan);
  background: rgba(53, 230, 216, 0.1);
  color: var(--cyan);
}

.page-about .ab-partner__tags .chip:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .ab-partner__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
}

@media (min-width: 900px) {
  .page-about .ab-partner__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

.page-about .ab-pcard {
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .ab-pcard__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 2.1vw, 21px);
  color: var(--white);
}

.page-about .ab-pcard__text {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-pcard__text:last-child {
  margin-bottom: 0;
}

/* 数量对比 */
.page-about .ab-bars {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--ab-steel-soft);
  background: var(--board);
  clip-path: var(--cut);
}

.page-about .ab-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
}

@media (min-width: 700px) {
  .page-about .ab-bar {
    grid-template-columns: minmax(0, 15rem) minmax(0, 1fr) 4.5rem;
    align-items: center;
    gap: 16px;
  }
}

.page-about .ab-bar__label {
  font-size: 14px;
  color: var(--white);
}

.page-about .ab-bar__track {
  position: relative;
  display: block;
  height: 8px;
  background: rgba(143, 160, 184, 0.16);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cobalt), var(--cyan));
}

.page-about .ab-bar__fill--a {
  width: 100%;
}

.page-about .ab-bar__fill--b {
  width: 34%;
}

.page-about .ab-bar__val {
  font-size: 19px;
  font-weight: 600;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-bar__val small {
  margin-left: 2px;
  font-size: 0.55em;
  color: var(--mist);
}

/* ---------- 06 联系 ---------- */
.page-about .ab-join {
  align-items: start;
  gap: clamp(20px, 3vw, 36px);
}

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

.page-about .ab-join__col--contact {
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--ab-hair);
  background: linear-gradient(155deg, rgba(53, 230, 216, 0.08), rgba(16, 28, 51, 0.7));
  clip-path: var(--cut);
}

.page-about .ab-join__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 20px);
  color: var(--white);
}

.page-about .ab-join__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-join__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
}

.page-about .ab-join__list li {
  display: grid;
  gap: 3px;
  padding-top: 11px;
  border-top: 1px solid var(--ab-steel-soft);
}

.page-about .ab-join__list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-join__k {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .ab-join__v {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--white);
  word-break: break-all;
}

.page-about .ab-join__note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 动效克制 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tagwall .chip,
  .page-about .ab-partner__tags .chip {
    transition: none;
  }
}
</main>