.page-about {
  --ab-scale: 80px;
  --ab-hair: rgba(107, 100, 128, 0.34);
  --ab-mesh: rgba(107, 100, 128, 0.16);
  display: block;
  padding-bottom: clamp(56px, 9vw, 104px);
}

/* ---------- 面包屑 ---------- */
.page-about .page-about__crumb {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--gutter) 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line-soft);
  font-size: 13px;
}
.page-about .crumb__now {
  color: var(--stone);
  letter-spacing: 0.04em;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--ab-mesh) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ab-mesh) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
  pointer-events: none;
}
.page-about .ab-hero__inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(38px, 6.5vw, 78px) var(--gutter) clamp(26px, 4vw, 40px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 38px);
}
.page-about .ab-hero__intro {
  min-width: 0;
}
.page-about .ab-hero__idx {
  margin-left: 10px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--stone);
}
.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6vw, 58px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--paper);
  text-wrap: balance;
}
.page-about .ab-hero__side {
  min-width: 0;
  border-left: 1px solid var(--line-soft);
  padding-left: clamp(16px, 2vw, 26px);
}
.page-about .ab-hero__lead {
  margin: 0;
  color: var(--paper);
  opacity: 0.88;
  max-width: 46ch;
}
.page-about .ab-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .ab-hero__wide {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(34px, 5.5vw, 58px);
}
.page-about .ab-hero__wide img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1600 / 600;
  object-fit: cover;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
}
.page-about .ab-hero__cap {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 通用小节 ---------- */
.page-about .ab-section {
  padding: clamp(40px, 6.5vw, 78px) 0;
}
.page-about .ab-head {
  max-width: 780px;
  margin-bottom: clamp(24px, 3.6vw, 40px);
}
.page-about .ab-head__title {
  margin: 12px 0 0;
}
.page-about .ab-head__lede {
  margin: 14px 0 0;
  color: var(--stone);
  max-width: 62ch;
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl {
  position: relative;
}
.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: calc(var(--ab-scale) / 2);
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    var(--ab-hair) 9%,
    var(--ab-hair) 91%,
    transparent 100%
  );
}
.page-about .ab-tl--cont::before {
  background: linear-gradient(
    180deg,
    var(--ab-hair) 0%,
    var(--ab-hair) 91%,
    transparent 100%
  );
}
.page-about .ab-tl__row {
  position: relative;
  display: grid;
  grid-template-columns: var(--ab-scale) minmax(0, 1fr);
  column-gap: 0;
  padding: 24px 0 26px;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-tl__row:first-child {
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-tl__scale {
  position: relative;
}
.page-about .ab-tl__no {
  display: block;
  padding-top: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}
.page-about .ab-tl__dot {
  position: absolute;
  left: calc(var(--ab-scale) / 2 - 4px);
  top: 13px;
  width: 8px;
  height: 8px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px var(--ink);
}
.page-about .ab-tl__body {
  min-width: 0;
  padding-right: 4px;
}
.page-about .ab-tl__title {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  color: var(--paper);
  line-height: 1.4;
}
.page-about .ab-tl__text {
  margin: 10px 0 0;
  color: var(--stone);
  max-width: 62ch;
}
.page-about .ab-tl__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}
.page-about .ab-tl__note {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--line-warm);
  font-size: 13px;
  color: var(--clay);
  transition: max-height 260ms ease, opacity 180ms ease, margin-top 260ms ease;
}
.page-about .ab-tl__row:hover .ab-tl__note,
.page-about .ab-tl__row:focus-within .ab-tl__note {
  max-height: 100px;
  opacity: 1;
  margin-top: 12px;
}
.page-about .ab-tl__note a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid var(--line-warm);
}
.page-about .ab-tl__mark {
  display: none;
}

/* ---------- 斜切换气带 ---------- */
.page-about .ab-band {
  position: relative;
  margin: clamp(36px, 6vw, 76px) 0;
  min-height: 240px;
  overflow: hidden;
  isolation: isolate;
  clip-path: polygon(0 24px, 100% 0, 100% calc(100% - 24px), 0 100%);
  background: linear-gradient(115deg, var(--moss) 0%, #22303F 46%, var(--ink) 100%);
}
.page-about .ab-band__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}
.page-about .ab-band__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    100deg,
    rgba(11, 18, 32, 0.9) 0%,
    rgba(11, 18, 32, 0.42) 56%,
    rgba(74, 90, 80, 0.55) 100%
  );
}
.page-about .ab-band__inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(52px, 8vw, 92px) var(--gutter);
}
.page-about .ab-band__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.6vw, 42px);
  font-weight: 800;
  line-height: 1.18;
  color: var(--paper);
  letter-spacing: -0.01em;
}

/* ---------- 三条标准 ---------- */
.page-about .ab-pri {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}
.page-about .ab-pri__item {
  border-top: 2px solid var(--line);
  padding-top: 18px;
}
.page-about .ab-pri__item--a {
  border-top-color: var(--cyan);
}
.page-about .ab-pri__item--b {
  border-top-color: var(--orange);
}
.page-about .ab-pri__item--c {
  border-top-color: var(--teal);
}
.page-about .ab-pri__tag {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--stone);
}
.page-about .ab-pri__title {
  margin: 0;
  color: var(--paper);
  line-height: 1.4;
}
.page-about .ab-pri__text {
  margin: 10px 0 0;
  color: var(--stone);
}
.page-about .ab-pri__text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__head {
  max-width: 800px;
  margin-bottom: clamp(24px, 3.6vw, 38px);
}
.page-about .ab-team__lede {
  margin: 14px 0 0;
  color: var(--stone);
  max-width: 64ch;
}
.page-about .ab-team__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}
.page-about .ab-team__col {
  min-width: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-team__col--a {
  border-top-color: var(--cyan);
}
.page-about .ab-team__col--b {
  border-top-color: var(--violet);
}
.page-about .ab-team__col--c {
  border-top-color: var(--moss);
}
.page-about .ab-team__role {
  margin: 0;
  color: var(--paper);
}
.page-about .ab-team__desc {
  margin: 10px 0 0;
  color: var(--stone);
}
.page-about .ab-team__figure {
  margin: clamp(30px, 4.5vw, 50px) 0 0;
  max-width: 620px;
}
.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 800 / 560;
  object-fit: cover;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
}
.page-about .ab-team__cap {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* ---------- 数字 ---------- */
.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-about .ab-fact {
  background: var(--ink-2);
  padding: clamp(20px, 3vw, 30px);
  min-width: 0;
}
.page-about .ab-fact__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}
.page-about .ab-fact__unit {
  margin: 8px 0 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--stone);
}
.page-about .ab-fact__label {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 接下来 ---------- */
.page-about .ab-next {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}
.page-about .ab-next__lede {
  margin: 14px 0 0;
  color: var(--stone);
  max-width: 42ch;
}
.page-about .ab-next__lede a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid var(--line-warm);
}
.page-about .ab-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-next__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-next__k {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--violet);
  padding-top: 4px;
}
.page-about .ab-next__c {
  min-width: 0;
}
.page-about .ab-next__title {
  margin: 0;
  color: var(--paper);
}
.page-about .ab-next__c p {
  margin: 8px 0 0;
  color: var(--stone);
  max-width: 60ch;
}

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .page-about {
    --ab-scale: 44px;
  }
  .page-about .ab-tl__row {
    padding: 20px 0 22px;
  }
  .page-about .ab-tl__no {
    padding-top: 4px;
    font-size: 11px;
  }
  .page-about .ab-tl__dot {
    top: 11px;
  }
  .page-about .ab-hero__side {
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--line-soft);
    padding-top: 20px;
  }
  .page-about .ab-tl__note {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }
}

@media (min-width: 861px) {
  .page-about .ab-tl__row {
    grid-template-columns: var(--ab-scale) minmax(0, 1fr) 140px;
  }
  .page-about .ab-tl__mark {
    display: block;
    text-align: right;
    padding-top: 4px;
  }
  .page-about .ab-tl__year {
    font-size: clamp(18px, 2.2vw, 26px);
    font-weight: 500;
    letter-spacing: -0.01em;
    color: var(--stone);
    border-right: 2px solid var(--line-soft);
    padding-right: 14px;
  }
  .page-about .ab-tl__row:hover .ab-tl__year {
    color: var(--cyan);
    border-right-color: var(--line-cyan);
  }
}

@media (min-width: 780px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
  .page-about .ab-pri {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 40px;
  }
  .page-about .ab-pri__item:nth-child(2) {
    margin-top: 26px;
  }
  .page-about .ab-pri__item:nth-child(3) {
    margin-top: 52px;
  }
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-next {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 900px) {
  .page-about .ab-team__cols {
    grid-template-columns: 5fr 4fr 3fr;
    gap: 34px;
  }
  .page-about .ab-team__cols .ab-team__col {
    padding-top: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__note,
  .page-about .ab-tl__year {
    transition: none;
  }
  .page-about .ab-tl__note {
    max-height: none;
    opacity: 1;
  }
}