.page-about {
  --ab-wine: #4A0F1C;
  --ab-indigo: #1E1747;
  --ab-teal: #06302D;
  --ab-rule: rgba(138, 155, 168, 0.28);
  --ab-text-soft: #b9c7d1;

  display: block;
  position: relative;
  color: var(--pale);
  background-color: var(--graphite);
}

/* ============ 首屏 ============ */
.page-about .ab-hero {
  position: relative;
  padding-block: clamp(104px, 15vw, 176px) clamp(40px, 6vw, 72px);
  background:
    radial-gradient(900px 520px at 88% -8%, rgba(11, 60, 93, 0.62), transparent 62%),
    radial-gradient(640px 420px at 2% 6%, rgba(200, 16, 46, 0.14), transparent 66%);
}

.page-about .crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 clamp(20px, 4vw, 40px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .crumb a {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.3s var(--ease);
}

.page-about .crumb a:hover,
.page-about .crumb a:focus-visible {
  color: var(--gold);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  align-items: end;
}

.page-about .ab-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(2.05rem, 6.6vw, 4.7rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--pale);
}

.page-about .ab-hero__text {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 62ch;
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  line-height: 1.85;
  color: var(--ab-text-soft);
}

.page-about .ab-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .ab-hero__card {
  position: relative;
  align-self: end;
  padding: clamp(30px, 3.6vw, 40px) clamp(20px, 3vw, 30px) clamp(20px, 3vw, 28px);
  background: linear-gradient(160deg, var(--night) 0%, var(--night-2) 100%);
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .ab-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .ab-facts__k {
  flex: 0 1 auto;
  min-width: 0;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .ab-facts__v {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
  text-shadow: 0 0 16px rgba(242, 169, 0, 0.3);
  white-space: nowrap;
}

.page-about .ab-facts__u {
  margin-left: 3px;
  font-size: 0.58em;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-shadow: none;
}

.page-about .ab-hero__card-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-hero__figure {
  position: relative;
  margin: clamp(34px, 5vw, 62px) 0 0;
}

.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: min(56vh, 520px);
  object-fit: cover;
  object-position: center;
  border: 2px solid var(--ab-rule);
  box-shadow: var(--hard-shadow);
}

.page-about .ab-hero__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

/* ============ 章节骨架 ============ */
.page-about .ab-chapter {
  position: relative;
  padding-block: clamp(56px, 8.4vw, 112px);
}

.page-about .ab-chapter--team {
  border-top: 2px solid var(--line-soft);
  border-bottom: 2px solid var(--line-soft);
  background:
    linear-gradient(180deg, rgba(6, 48, 45, 0.92) 0%, rgba(6, 48, 45, 0.42) 58%, rgba(14, 17, 22, 0) 100%);
}

.page-about .ab-chapter--trust {
  background:
    linear-gradient(165deg, rgba(30, 23, 71, 0.72) 0%, rgba(14, 17, 22, 0) 62%);
}

.page-about .ab-chapter--report {
  border-top: 2px solid var(--line-soft);
}

.page-about .ab-chapter--contact {
  padding-block: clamp(48px, 7vw, 96px) clamp(56px, 8vw, 110px);
}

.page-about .section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px clamp(20px, 3vw, 48px);
  align-items: end;
  padding-bottom: clamp(16px, 2.4vw, 26px);
  border-bottom: 2px solid var(--line-soft);
}

.page-about .section-head__title {
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.55rem);
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--pale);
}

.page-about .section-head__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ============ 编年时间轴 ============ */
.page-about .ab-timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 60px);
  margin-top: clamp(30px, 4.6vw, 54px);
}

.page-about .ab-rail {
  align-self: start;
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.page-about .ab-rail__y {
  display: block;
  font-family: var(--font-mono);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--pale);
}

.page-about .ab-rail__t {
  display: block;
  margin-top: 3px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .ab-tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 22px;
  width: 2px;
  background: linear-gradient(180deg,
    var(--ice-2) 0%,
    var(--ice-2) 26%,
    var(--maple) 72%,
    rgba(200, 16, 46, 0) 100%);
}

.page-about .ab-tl-item {
  position: relative;
  padding: 0 0 clamp(30px, 4.4vw, 52px) 40px;
}

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

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 16px;
  height: 16px;
  background: var(--graphite);
  border: 2px solid var(--ice-2);
  transform: rotate(45deg);
  transition:
    background-color 0.5s var(--ease),
    border-color 0.5s var(--ease),
    box-shadow 0.5s var(--ease);
}

.page-about .ab-tl-item.is-visible::before {
  background: var(--maple);
  border-color: var(--maple);
  box-shadow: 0 0 0 6px rgba(200, 16, 46, 0.14);
}

.page-about .ab-tl-item__year {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 10px;
  border: 2px solid rgba(242, 169, 0, 0.4);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .ab-tl-item__title {
  margin: 0 0 10px;
  font-size: clamp(1.12rem, 2.4vw, 1.55rem);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.015em;
  color: var(--pale);
}

.page-about .ab-tl-item__text {
  margin: 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ab-text-soft);
}

/* ============ 团队 ============ */
.page-about .ab-team-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 48px);
  align-items: center;
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .ab-fig {
  position: relative;
  margin: 0;
  border: 2px solid var(--ab-rule);
  box-shadow: var(--hard-shadow);
  background: var(--night);
  overflow: hidden;
}

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

.page-about .ab-fig figcaption {
  padding: 10px 14px;
  border-top: 2px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .ab-team-note__title {
  margin: 0 0 14px;
  font-size: clamp(1.15rem, 2.4vw, 1.6rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--pale);
}

.page-about .ab-team-note__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ab-text-soft);
}

.page-about .ab-team-note__list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-team-note__list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ab-text-soft);
}

.page-about .ab-team-note__list .num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  text-shadow: 0 0 16px rgba(242, 169, 0, 0.3);
}

.page-about .ab-teams {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 26px);
  margin-top: clamp(30px, 4.6vw, 54px);
}

.page-about .ab-team {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 13px;
  padding: clamp(22px, 2.8vw, 34px);
  border: 2px solid rgba(232, 241, 245, 0.16);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.38);
  overflow: hidden;
}

.page-about .ab-team::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
}

.page-about .ab-team--eng {
  background: linear-gradient(165deg, #06302D 0%, #0A1F24 100%);
}

.page-about .ab-team--eng::after {
  background: var(--aurora);
}

.page-about .ab-team--stat {
  background: linear-gradient(165deg, #4A0F1C 0%, #2A0A12 100%);
}

.page-about .ab-team--stat::after {
  background: var(--maple);
}

.page-about .ab-team--ux {
  background: linear-gradient(165deg, #1E1747 0%, #14102E 100%);
}

.page-about .ab-team--ux::after {
  background: var(--cold);
}

.page-about .ab-team__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.26em;
  color: rgba(232, 241, 245, 0.5);
}

.page-about .ab-team__name {
  margin: 0;
  font-size: clamp(1.08rem, 2.2vw, 1.3rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--pale);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(232, 241, 245, 0.78);
}

.page-about .ab-team__list {
  list-style: none;
  margin: auto 0 0;
  padding: 14px 0 0;
  border-top: 1px solid rgba(232, 241, 245, 0.16);
  display: grid;
  gap: 9px;
}

.page-about .ab-team__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.72;
  color: rgba(232, 241, 245, 0.72);
}

.page-about .ab-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--gold);
  transform: rotate(45deg);
  opacity: 0.75;
}

/* ============ 合作与安全 ============ */
.page-about .ab-trust {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 54px);
  align-items: start;
  margin-top: clamp(28px, 4.2vw, 50px);
}

.page-about .ab-trust__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line-soft);
  border: 2px solid var(--ab-rule);
}

.page-about .ab-trust__item {
  background: rgba(27, 34, 43, 0.86);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .ab-trust__lead {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .ab-trust__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ab-text-soft);
}

.page-about .ab-trust__link {
  margin: 22px 0 0;
}

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

/* ============ 年报与规模 ============ */
.page-about .ab-report {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .ab-report__cover {
  position: relative;
  padding: clamp(26px, 3.4vw, 42px);
  background: linear-gradient(155deg, #101C2C 0%, #0E1116 72%);
  border: 2px solid rgba(242, 169, 0, 0.35);
  box-shadow: 8px 8px 0 rgba(242, 169, 0, 0.14);
  overflow: hidden;
}

.page-about .ab-report__cover::before {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -70px;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(200, 16, 46, 0.3), transparent 70%);
  pointer-events: none;
}

.page-about .ab-report__cover h3 {
  position: relative;
  margin: 14px 0 12px;
  font-size: clamp(1.28rem, 2.8vw, 1.85rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.025em;
  color: var(--pale);
}

.page-about .ab-report__cover-text {
  position: relative;
  margin: 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ab-text-soft);
}

.page-about .ab-report__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  background: var(--line-soft);
  border: 2px solid var(--ab-rule);
}

.page-about .ab-report__stats li {
  background: var(--night);
  padding: clamp(18px, 2.4vw, 28px);
}

.page-about .ab-report__v {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
  text-shadow: 0 0 20px rgba(242, 169, 0, 0.3);
}

.page-about .ab-report__k {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* ============ 联系 ============ */
.page-about .ab-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 54px);
  padding: clamp(28px, 4.4vw, 56px);
  border: 2px solid rgba(200, 16, 46, 0.42);
  background: linear-gradient(140deg, rgba(74, 15, 28, 0.9) 0%, rgba(14, 17, 22, 0.92) 66%);
  box-shadow: 8px 8px 0 rgba(200, 16, 46, 0.2);
}

.page-about .ab-cta__title {
  margin: 14px 0 0;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--pale);
}

.page-about .ab-cta__text {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ab-text-soft);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .ab-cta__contact {
  display: grid;
  align-content: start;
}

.page-about .ab-cta__row {
  display: grid;
  gap: 5px;
  margin: 0;
  padding: 13px 0;
  border-bottom: 1px solid rgba(232, 241, 245, 0.14);
}

.page-about .ab-cta__k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.page-about .ab-cta__v {
  font-size: 14px;
  line-height: 1.6;
  color: var(--pale);
  overflow-wrap: anywhere;
}

.page-about .ab-cta__v.num {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.page-about .ab-cta__note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .ab-report__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .ab-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .section-head {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.85fr);
  }

  .page-about .ab-team-top {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
  }

  .page-about .ab-report {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.22fr);
  }

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .ab-trust {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 980px) {
  .page-about .ab-timeline {
    grid-template-columns: 168px minmax(0, 1fr);
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--head-h) + 28px);
    padding-right: 18px;
    border-right: 2px solid var(--line-soft);
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 18px;
  }
}

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