.page-about {
  --ab-line: rgba(245, 241, 232, .16);
  --ab-line-dark: rgba(18, 59, 46, .14);
  --ab-cut: 14px;
  background: var(--green-800);
  color: var(--cream);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(84px, 13vw, 160px) 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 84% 6%, rgba(242, 140, 40, .26) 0%, rgba(242, 140, 40, 0) 58%),
    linear-gradient(180deg, var(--green-900) 0%, var(--green-800) 100%);
  overflow: hidden;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 34px);
  padding: clamp(20px, 3.4vw, 44px);
  border: 1px solid var(--ab-line);
  background: rgba(11, 36, 28, .32);
}

.page-about .about-hero__grid::before,
.page-about .about-hero__grid::after {
  content: "";
  position: absolute;
  width: 42px;
  height: 42px;
  border: 2px solid var(--apricot);
  pointer-events: none;
}

.page-about .about-hero__grid::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__grid::after {
  right: -1px;
  bottom: -1px;
  border-top: 0;
  border-left: 0;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  max-width: 15em;
  font-size: clamp(32px, 7vw, 68px);
  line-height: 1.08;
  font-weight: 200;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .about-hero__intro {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 241, 232, .84);
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 34px;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: clamp(16px, 2.2vw, 22px) 0 0;
  list-style: none;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(30px, 4.4vw, 40px);
  line-height: 1;
  color: var(--apricot);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}

.page-about .about-hero__lbl {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-hero__figure {
  margin: 0;
  align-self: stretch;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--ab-cut)), calc(100% - var(--ab-cut)) 100%, 0 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 220px;
  object-fit: cover;
}

/* ---------- 起点 ---------- */
.page-about .about-origin,
.page-about .about-track,
.page-about .about-sources,
.page-about .about-partner,
.page-about .about-cta {
  padding: clamp(48px, 7.5vw, 104px) 0;
}

.page-about .about-origin {
  background: var(--green-800);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .about-origin__lead .cond-title {
  margin: 12px 0 clamp(16px, 2.4vw, 24px);
  max-width: 16em;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.18;
  color: var(--cream);
}

.page-about .about-origin__lead p {
  color: rgba(245, 241, 232, .82);
}

.page-about .about-origin__link {
  margin-top: clamp(20px, 2.6vw, 28px);
}

.page-about .about-origin__link a {
  display: inline-block;
  padding-bottom: 4px;
  color: var(--apricot);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  font-size: 15px;
}

.page-about .about-origin__aside {
  padding: clamp(20px, 3vw, 30px);
  border-top: 2px solid var(--apricot);
  background: linear-gradient(150deg, var(--green-700) 0%, rgba(11, 36, 28, .5) 100%);
}

.page-about .about-origin__big {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(56px, 12vw, 96px);
  line-height: .9;
  color: var(--lemon);
  font-variant-numeric: tabular-nums;
}

.page-about .about-origin__aside-txt {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(245, 241, 232, .88);
}

.page-about .about-origin__aside-note {
  margin: 16px 0 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

/* ---------- 版本刻度 ---------- */
.page-about .about-track {
  background: var(--green-900);
}

.page-about .about-track .cond-title {
  margin: 12px 0 clamp(14px, 2vw, 20px);
  max-width: 20em;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.18;
  color: var(--cream);
}

.page-about .about-track__lede {
  color: rgba(245, 241, 232, .78);
  font-size: 15px;
}

.page-about .track {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 28px);
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .track__rail {
  display: none;
}

.page-about .track__list {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .track__item {
  position: relative;
  padding: clamp(18px, 2.8vw, 30px);
  background: linear-gradient(118deg, rgba(29, 81, 64, .6) 0%, rgba(18, 59, 46, .12) 100%);
  border-left: 3px solid var(--green-700);
  transition: border-color .3s var(--ease), transform .3s var(--ease), background .3s var(--ease);
}

.page-about .track__item:hover,
.page-about .track__item:focus-within {
  border-left-color: var(--lemon);
  transform: translateX(4px);
  background: linear-gradient(118deg, rgba(29, 81, 64, .82) 0%, rgba(18, 59, 46, .2) 100%);
}

.page-about .track__ver {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1;
  color: var(--apricot);
  letter-spacing: .03em;
}

.page-about .track__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .track__q {
  margin: 0 0 10px;
  padding-left: 12px;
  border-left: 2px solid rgba(198, 242, 78, .55);
  font-size: 13px;
  line-height: 1.7;
  color: var(--lemon);
}

.page-about .track__body {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(245, 241, 232, .82);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--cream);
  color: var(--green-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), 0 100%);
  padding-bottom: calc(clamp(48px, 7.5vw, 104px) + 30px);
}

.page-about .about-team .cond-title {
  margin: 12px 0 clamp(22px, 3vw, 34px);
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.18;
  color: var(--green-800);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-team__stat {
  display: grid;
  gap: 10px;
  padding-bottom: clamp(20px, 3vw, 30px);
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .about-team__big {
  margin: 0;
  font-size: clamp(72px, 15vw, 132px);
  line-height: .84;
  color: var(--apricot);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__stat-txt {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(18, 59, 46, .82);
}

.page-about .about-team__plates {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--ab-line-dark);
  border-top: 1px solid var(--ab-line-dark);
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .about-plate {
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--cream);
}

.page-about .about-plate__num {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: .12em;
  color: var(--apricot);
}

.page-about .about-plate__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--green-800);
}

.page-about .about-plate p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(18, 59, 46, .78);
}

.page-about .about-team__figure {
  margin: 0;
  align-self: start;
  clip-path: polygon(0 0, 100% 0, 100% 100%, var(--ab-cut) 100%, 0 calc(100% - var(--ab-cut)));
}

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

/* ---------- 数据来源 ---------- */
.page-about .about-sources {
  background: var(--green-900);
}

.page-about .about-sources .cond-title {
  margin: 12px 0 clamp(20px, 3vw, 30px);
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.18;
  color: var(--cream);
}

.page-about .about-sources__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
}

.page-about .about-sources__text p {
  margin: 0 0 16px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 241, 232, .84);
}

.page-about .about-sources__steps {
  display: grid;
  gap: 1px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  background: rgba(245, 241, 232, .14);
  border-top: 1px solid rgba(245, 241, 232, .14);
  border-bottom: 1px solid rgba(245, 241, 232, .14);
}

.page-about .about-sources__steps li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  padding: clamp(14px, 2vw, 20px);
  background: var(--green-900);
}

.page-about .about-sources__steps span {
  grid-row: span 2;
  font-family: var(--font-num);
  font-size: 22px;
  line-height: 1.2;
  color: var(--lemon);
}

.page-about .about-sources__steps h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--cream);
}

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

.page-about .about-sources__figure {
  margin: 0;
  align-self: start;
}

.page-about .about-sources__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.45) contrast(1.05);
  opacity: .88;
}

.page-about .about-sources__figure .media__caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .about-partner {
  background: var(--green-800);
}

.page-about .about-partner .cond-title {
  margin: 12px 0 clamp(12px, 2vw, 18px);
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.18;
  color: var(--cream);
}

.page-about .about-partner__lede {
  color: rgba(245, 241, 232, .8);
  font-size: 15px;
}

.page-about .about-tabs {
  margin-top: clamp(24px, 3.4vw, 40px);
}

.page-about .about-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .about-tabs__tab {
  font: inherit;
  font-size: 14px;
  letter-spacing: .05em;
  cursor: pointer;
  padding: 10px 18px;
  color: var(--mist);
  background: transparent;
  border: 1px solid rgba(245, 241, 232, .24);
  clip-path: polygon(9px 0, 100% 0, 100% 100%, 0 100%, 0 9px);
  transition: color .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-tabs__tab:hover {
  color: var(--cream);
  border-color: rgba(198, 242, 78, .6);
}

.page-about .about-tabs__tab[aria-selected="true"] {
  color: var(--green-900);
  background: var(--lemon);
  border-color: var(--lemon);
}

.page-about .about-tabs__tab:focus-visible {
  outline: 2px solid var(--apricot);
  outline-offset: 2px;
}

.page-about .about-tabs__panel {
  padding: clamp(20px, 3vw, 34px) 0 0;
}

.page-about .about-tabs__panel h3 {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.4vw, 23px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--apricot);
}

.page-about .about-tabs__panel p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 241, 232, .84);
}

/* ---------- 规模 ---------- */
.page-about .about-scale {
  background: var(--cream);
  color: var(--green-800);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), 0 100%);
  padding-bottom: calc(clamp(48px, 7.5vw, 104px) + 30px);
}

.page-about .about-scale .cond-title {
  margin: 12px 0 clamp(18px, 2.4vw, 26px);
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.18;
  color: var(--green-800);
}

.page-about .about-scale__grid {
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-facts {
  width: 100%;
  border-collapse: collapse;
  margin-top: clamp(14px, 2vw, 22px);
}

.page-about .about-facts th,
.page-about .about-facts td {
  padding: 13px 10px;
  text-align: left;
  vertical-align: top;
  font-size: 14px;
  line-height: 1.7;
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .about-facts th {
  width: 38%;
  font-weight: 600;
  color: rgba(18, 59, 46, .72);
  white-space: nowrap;
}

.page-about .about-facts td {
  color: var(--green-800);
}

.page-about .about-scale__aside {
  padding-top: 16px;
  border-top: 2px solid var(--apricot);
}

.page-about .about-scale__aside-title {
  margin: 0 0 16px;
  font-size: 18px;
  font-weight: 700;
  color: var(--green-800);
}

.page-about .about-scale__list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
}

.page-about .about-scale__list dt {
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(18, 59, 46, .6);
}

.page-about .about-scale__list dd {
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--green-800);
}

.page-about .about-scale__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ab-line-dark);
  font-size: 13px;
  line-height: 1.75;
  color: rgba(18, 59, 46, .74);
}

.page-about .about-scale__icp {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(18, 59, 46, .55);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background: linear-gradient(180deg, var(--green-800) 0%, var(--green-900) 100%);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  align-items: end;
  padding: clamp(22px, 3.4vw, 40px);
  border: 1px solid var(--ab-line);
  border-left: 3px solid var(--apricot);
}

.page-about .about-cta .cond-title {
  margin: 0 0 12px;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.2;
  color: var(--cream);
}

.page-about .about-cta__txt {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 241, 232, .82);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-team__plates {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }
}

@media (min-width: 880px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .track {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: clamp(24px, 3.4vw, 52px);
  }

  .page-about .track__rail {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: sticky;
    top: calc(var(--bar-h) + 48px);
    align-self: start;
    height: 420px;
    padding-right: 14px;
    border-right: 1px solid var(--ab-line);
    background-image: repeating-linear-gradient(
      to bottom,
      rgba(245, 241, 232, .22) 0 1px,
      transparent 1px 21px
    );
    background-size: 8px 100%;
    background-repeat: repeat-y;
    background-position: right top;
  }

  .page-about .track__node {
    position: relative;
    text-align: right;
    transition: color .3s var(--ease);
  }

  .page-about .track__node-txt {
    font-family: var(--font-num);
    font-size: 20px;
    letter-spacing: .08em;
    color: var(--mist);
  }

  .page-about .track__node::after {
    content: "";
    position: absolute;
    right: -18px;
    top: 50%;
    width: 9px;
    height: 9px;
    transform: translateY(-50%) rotate(45deg);
    background: var(--apricot);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }

  .page-about .about-sources__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: stretch;
  }
}

@media (min-width: 1080px) {
  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .track__item,
  .page-about .about-tabs__tab,
  .page-about .track__node {
    transition: none;
  }

  .page-about .track__item:hover,
  .page-about .track__item:focus-within {
    transform: none;
  }
}