.page-about {
  --about-ch: 62ch;
  background: var(--ink);
  color: var(--sky);
  overflow-x: hidden;
  overflow-x: clip;
}

.page-about [id] {
  scroll-margin-top: calc(var(--header-h) + 28px);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 36px) 0 clamp(36px, 7vw, 76px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(88% 70% at 90% 0%, rgba(45, 123, 255, .30), transparent 62%),
    linear-gradient(180deg, #0A1526 0%, var(--ink) 78%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -10%;
  bottom: -34%;
  width: min(520px, 82vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(182, 255, 59, .14), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(24px, 5vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 48px);
  align-items: end;
}

.page-about .about-hero__copy > * + * {
  margin-top: clamp(14px, 2vw, 20px);
}

.page-about .about-hero__copy .content {
  max-width: var(--about-ch);
  color: var(--sky);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: clamp(4px, 1vw, 10px);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
  box-shadow: 0 26px 60px -34px rgba(0, 0, 0, .8);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .about-hero__figure figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px 18px;
  background: linear-gradient(180deg, rgba(7, 16, 31, 0), rgba(7, 16, 31, .94));
  color: var(--lime);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.page-about .about-anchors {
  margin-top: clamp(22px, 3.4vw, 32px);
}

.page-about .about-anchors__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-anchors a {
  display: inline-flex;
  align-items: center;
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--sky);
  text-decoration: none;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-anchors a:hover,
.page-about .about-anchors a:focus-visible {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
  outline: none;
}

/* ============ 起点 ============ */
.page-about .about-origin {
  padding: clamp(52px, 9vw, 108px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-year {
  display: block;
  font-size: clamp(64px, 16vw, 146px);
  line-height: .8;
  letter-spacing: -.06em;
  color: var(--lime);
}

.page-about .about-year__cap {
  display: block;
  margin-top: 14px;
  font-size: 11px;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-origin__body {
  max-width: var(--about-ch);
}

.page-about .about-origin__body > * + * {
  margin-top: clamp(14px, 2vw, 20px);
}

.page-about .about-origin__body .content {
  color: var(--sky);
}

.page-about .about-quote {
  margin-top: clamp(22px, 3vw, 30px);
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 28px);
  border-radius: var(--radius-m);
  border-left: 5px solid var(--lime);
  background: var(--paper);
  color: #1B2436;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
}

/* ============ 服务对象 ============ */
.page-about .about-audience {
  padding: clamp(52px, 9vw, 108px) 0;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink) 0%, #091426 100%);
}

.page-about .about-personas {
  margin-top: clamp(30px, 5vw, 54px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 26px);
}

.page-about .about-persona {
  position: relative;
  padding: clamp(22px, 3vw, 30px);
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .about-persona::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(22px, 3vw, 30px);
  width: 46px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--blue);
}

.page-about .about-persona--b::before { background: var(--lime); }
.page-about .about-persona--c::before { background: var(--orange); }

.page-about .about-persona:hover,
.page-about .about-persona:focus-within {
  border-color: var(--blue);
  background: var(--ink-3);
  transform: translateY(-4px);
}

.page-about .about-persona__no {
  display: block;
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 12px;
}

.page-about .about-persona--b .about-persona__no { color: var(--lime); }
.page-about .about-persona--c .about-persona__no { color: var(--orange); }

.page-about .about-persona .content {
  margin-top: 10px;
  color: var(--sky);
}

.page-about .about-persona__list {
  list-style: none;
  margin: clamp(14px, 2vw, 20px) 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-persona__list li {
  position: relative;
  padding-left: 19px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--sky);
}

.page-about .about-persona__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--lime);
  transform: rotate(45deg);
}

/* ============ 场馆资料 ============ */
.page-about .about-venue {
  padding: clamp(52px, 9vw, 108px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-venue__layout {
  margin-top: clamp(28px, 5vw, 50px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-fields {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-field {
  background: var(--ink-2);
  padding: clamp(20px, 2.8vw, 28px);
  transition: background .3s var(--ease);
}

.page-about .about-field:hover {
  background: var(--ink-3);
}

.page-about .about-field__no {
  display: block;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--blue);
  margin-bottom: 10px;
}

.page-about .about-field .content {
  margin-top: 8px;
  font-size: 14px;
  color: var(--sky);
}

.page-about .about-venue__rhythm.card {
  border: 1px solid transparent;
  border-radius: var(--radius-m);
  padding: clamp(20px, 3vw, 28px);
  background: var(--paper);
  color: #1B2436;
}

.page-about .about-venue__rhythm .card__label {
  color: #4A5568;
  letter-spacing: .2em;
}

.page-about .about-rhythm {
  list-style: none;
  margin: clamp(14px, 2vw, 20px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-rhythm li {
  display: grid;
  gap: 3px;
  padding-top: 13px;
  border-top: 1px solid rgba(27, 36, 54, .18);
}

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

.page-about .about-rhythm b {
  font-family: var(--mono);
  font-size: clamp(18px, 2.4vw, 23px);
  line-height: 1.1;
  color: #16203A;
}

.page-about .about-rhythm span {
  font-size: 13px;
  line-height: 1.6;
  color: #4A5568;
}

/* ============ 团队 ============ */
.page-about .about-team {
  padding: clamp(52px, 9vw, 108px) 0;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #091426 0%, var(--ink) 100%);
}

.page-about .about-team__layout {
  margin-top: clamp(28px, 5vw, 50px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 42px);
  align-items: start;
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-team__figure figcaption {
  padding: 15px 18px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--slate);
}

.page-about .about-tree {
  display: grid;
  gap: 0;
}

.page-about .about-tree__tier {
  padding: clamp(16px, 2.2vw, 22px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-2);
  transition: border-color .3s var(--ease);
}

.page-about .about-tree__tier:focus-within {
  border-color: var(--blue);
}

.page-about .about-tree__tier-label {
  display: block;
  font-size: 11px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 13px;
}

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

.page-about .about-tree__node {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--ink);
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--sky);
  transition: border-color .2s var(--ease), color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-tree__node:hover,
.page-about .about-tree__node:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
  box-shadow: 0 0 0 3px rgba(182, 255, 59, .14);
  outline: none;
}

.page-about .about-tree__node--accent {
  background: rgba(45, 123, 255, .16);
  border-color: var(--blue);
  color: #DCE9FF;
}

.page-about .about-tree__note {
  margin: 13px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-tree__link {
  position: relative;
  height: 24px;
  margin-left: clamp(18px, 3vw, 34px);
  width: 2px;
  background: linear-gradient(180deg, var(--lime), rgba(182, 255, 59, .12));
}

/* ============ 里程碑 ============ */
.page-about .about-milestones {
  padding: clamp(52px, 9vw, 108px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-milestones__figure {
  margin: clamp(26px, 4vw, 46px) 0 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-milestones__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-milestones__figure figcaption {
  padding: 15px 20px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-timeline {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
}

.page-about .about-timeline__item {
  position: relative;
  padding: clamp(20px, 3vw, 28px) 0 clamp(20px, 3vw, 28px) clamp(30px, 6vw, 56px);
  border-top: 1px solid var(--line);
  transition: background .3s var(--ease);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(26px, 3.6vw, 34px);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 5px rgba(182, 255, 59, .12);
  transition: box-shadow .25s var(--ease);
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 5.5px;
  top: calc(clamp(26px, 3.6vw, 34px) + 15px);
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(182, 255, 59, .5), rgba(36, 52, 77, .12));
}

.page-about .about-timeline__item:last-child::after {
  display: none;
}

.page-about .about-timeline__item:hover,
.page-about .about-timeline__item:focus-visible {
  background: rgba(14, 27, 51, .7);
  outline: none;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-visible::before {
  box-shadow: 0 0 0 8px rgba(182, 255, 59, .18);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 8px;
  font-size: clamp(30px, 5.4vw, 46px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--sky);
  transition: color .25s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__year,
.page-about .about-timeline__item:focus-visible .about-timeline__year {
  color: var(--lime);
}

.page-about .about-timeline__item .content {
  font-size: 14.5px;
  color: var(--sky);
}

.page-about .about-timeline__more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--slate);
  transition: max-height .4s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__more,
.page-about .about-timeline__item:focus .about-timeline__more,
.page-about .about-timeline__item:focus-within .about-timeline__more {
  max-height: 240px;
  opacity: 1;
  margin-top: 10px;
}

/* ============ 长期价值 ============ */
.page-about .about-trust {
  padding: clamp(52px, 9vw, 108px) 0 clamp(56px, 9vw, 112px);
}

.page-about .about-trust__stats {
  margin-top: clamp(28px, 4vw, 46px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 20px);
}

.page-about .about-stat {
  padding: clamp(18px, 2.6vw, 26px);
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .about-stat:hover {
  border-color: var(--blue);
  transform: translateY(-3px);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(25px, 4vw, 36px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--lime);
}

.page-about .about-stat__key {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--slate);
}

.page-about .about-trust__cta {
  margin-top: clamp(28px, 4vw, 46px);
  padding: clamp(22px, 3.4vw, 36px);
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(45, 123, 255, .22), rgba(182, 255, 59, .10) 72%, rgba(255, 138, 61, .12));
  display: grid;
  gap: 18px;
}

.page-about .about-trust__cta .content {
  max-width: var(--about-ch);
  margin-top: 10px;
  font-size: 14.5px;
}

.page-about .about-trust__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ 响应式 ============ */
@media (min-width: 700px) {
  .page-about .about-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-timeline__item:nth-child(2) { margin-left: 3.5%; }
  .page-about .about-timeline__item:nth-child(3) { margin-left: 7%; }
  .page-about .about-timeline__item:nth-child(4) { margin-left: 10.5%; }
  .page-about .about-timeline__item:nth-child(5) { margin-left: 14%; }

  .page-about .about-trust__cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 30px;
  }

  .page-about .about-trust__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 860px) {
  .page-about .about-trust__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(180px, .38fr) minmax(0, .62fr);
    gap: clamp(32px, 6vw, 90px);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-venue__layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(240px, .45fr);
    align-items: start;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: clamp(32px, 5vw, 76px);
  }
}

@media (min-width: 940px) {
  .page-about .about-personas {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-persona--b {
    margin-top: clamp(28px, 5vw, 64px);
  }

  .page-about .about-persona--c {
    margin-top: clamp(56px, 9vw, 118px);
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: clamp(28px, 4vw, 48px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-persona,
  .page-about .about-stat,
  .page-about .about-timeline__item,
  .page-about .about-timeline__more,
  .page-about .about-tree__node,
  .page-about .about-anchors a {
    transition: none;
  }

  .page-about .about-persona:hover,
  .page-about .about-stat:hover {
    transform: none;
  }
}