.page-about {
  --about-edge: rgba(157, 179, 173, .16);
  --about-edge-strong: rgba(157, 179, 173, .3);
  --about-tint: rgba(56, 211, 159, .12);
  background: var(--pitch);
  color: var(--neon);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about .breadcrumbs__current {
  color: var(--mist);
}

/* ---------- 页首 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(52px, 9vw, 108px) 0 clamp(38px, 6vw, 76px);
  background: var(--night);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  filter: saturate(.45) brightness(.34) contrast(1.1);
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(11, 27, 58, .74) 0%, rgba(10, 46, 40, .88) 58%, var(--pitch) 100%),
    radial-gradient(120% 90% at 84% 8%, rgba(226, 58, 46, .22), transparent 58%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.4vw, 66px);
  line-height: 1.14;
  letter-spacing: -.01em;
  font-weight: 800;
  max-width: 18em;
}

.page-about .about-hero__title-accent {
  display: block;
  color: var(--yellow);
  transform: skewX(-2deg);
  transform-origin: left bottom;
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(241, 251, 246, .86);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: clamp(28px, 5vw, 48px) 0 0;
  padding: 0;
  border: 1px solid var(--about-edge);
  background: var(--about-edge);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__fact {
  background: rgba(11, 27, 58, .82);
  padding: 16px 18px 18px;
  backdrop-filter: blur(2px);
}

.page-about .about-hero__fact dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-hero__fact dd {
  margin: 6px 0 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
}

.page-about .display-num {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: .92;
  font-size: clamp(30px, 5.4vw, 50px);
  color: var(--neon);
  transform: skewX(-2deg);
}

.page-about .about-hero__unit {
  font-size: 12px;
  color: var(--mist);
}

/* ---------- 目录条 ---------- */

.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 24;
  background: rgba(10, 46, 40, .94);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--about-edge);
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-toc__inner {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 10px;
  padding-bottom: 10px;
  scrollbar-width: none;
}

.page-about .about-toc__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc .chip {
  flex: 0 0 auto;
  white-space: nowrap;
}

/* ---------- 我们在做什么 ---------- */

.page-about .about-intro {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--pitch);
}

.page-about .about-intro__grid {
  display: grid;
  gap: clamp(20px, 4vw, 48px);
  grid-template-columns: 1fr;
}

.page-about .about-intro__title {
  margin: 12px 0 0;
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.2;
  font-weight: 800;
  color: var(--neon);
}

.page-about .about-intro__title::after {
  content: "";
  display: block;
  width: 66px;
  height: 6px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--red) 0 34%, var(--yellow) 34% 100%);
  transform: skewX(-18deg);
  border-radius: 1px;
}

.page-about .about-intro__body {
  max-width: 38em;
}

.page-about .about-intro__body p {
  margin: 0 0 18px;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.9;
  color: rgba(241, 251, 246, .84);
}

.page-about .about-intro__pull {
  margin: 26px 0 0;
  padding: 18px 20px 18px 22px;
  border-left: 4px solid var(--green);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--about-tint);
  color: var(--neon);
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  line-height: 1.6;
}

/* ---------- 版本刻度 ---------- */

.page-about .about-timeline {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--night);
  border-top: 1px solid var(--about-edge);
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-timeline__rail {
  position: relative;
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-timeline__rail::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 7px;
  width: 2px;
  background: linear-gradient(180deg, var(--yellow), var(--red) 62%, var(--green));
  opacity: .5;
}

.page-about .about-timeline__node {
  position: relative;
  padding: 0 0 26px;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  top: 8px;
  left: -30px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--pitch);
  border: 2px solid var(--mist);
  transform: translateX(1px);
}

.page-about .about-timeline__node--now::before {
  background: var(--green);
  border-color: var(--green);
  box-shadow: 0 0 0 5px rgba(56, 211, 159, .16);
}

.page-about .about-timeline__ver {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--yellow);
}

.page-about .about-timeline__node--now .about-timeline__ver {
  color: var(--green);
}

.page-about .about-timeline__title {
  margin: 6px 0 8px;
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 700;
  line-height: 1.36;
  color: var(--neon);
}

.page-about .about-timeline__body {
  margin: 0;
  max-width: 44em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(241, 251, 246, .74);
}

.page-about .about-timeline__gain {
  margin: 10px 0 0;
  display: inline-block;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--about-edge-strong);
  background: rgba(18, 70, 61, .7);
  font-size: 13px;
  line-height: 1.6;
  color: var(--yellow);
}

.page-about .about-timeline__node--now .about-timeline__gain {
  color: var(--neon);
  border-color: rgba(56, 211, 159, .5);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  position: relative;
  isolation: isolate;
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--pitch);
  overflow: hidden;
}

.page-about .about-team__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: .2;
}

.page-about .about-team__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.3) brightness(.6) contrast(1.05);
}

.page-about .about-team__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--pitch) 0%, rgba(10, 46, 40, .82) 45%, var(--pitch) 100%);
}

.page-about .about-team__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-team__units {
  display: grid;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-team__unit {
  border: 1px solid var(--about-edge);
  border-left: 3px solid var(--yellow);
  border-radius: var(--r-md);
  background: rgba(18, 70, 61, .78);
  padding: 0;
  overflow: hidden;
}

.page-about .about-team__unit:nth-child(2) {
  border-left-color: var(--red);
}

.page-about .about-team__unit:nth-child(3) {
  border-left-color: var(--green);
}

.page-about .about-team__unit:nth-child(4) {
  border-left-color: var(--mist);
}

.page-about .about-team__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-team__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team__count {
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
  min-width: 72px;
}

.page-about .about-team__count .display-num {
  font-size: clamp(26px, 4.4vw, 38px);
  color: var(--yellow);
}

.page-about .about-team__unit:nth-child(2) .about-team__count .display-num {
  color: var(--red);
}

.page-about .about-team__unit:nth-child(3) .about-team__count .display-num {
  color: var(--green);
}

.page-about .about-team__unit:nth-child(4) .about-team__count .display-num {
  color: var(--mist);
}

.page-about .about-team__unit-word {
  font-size: 12px;
  color: var(--mist);
}

.page-about .about-team__name {
  font-size: clamp(15px, 1.8vw, 18px);
  font-weight: 700;
  color: var(--neon);
}

.page-about .about-team__desc {
  margin: 0;
  padding: 0 18px 18px 104px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(241, 251, 246, .8);
}

.page-about .about-team__unit[open] .about-team__summary {
  border-bottom: 1px solid var(--about-edge);
  margin-bottom: 14px;
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-reach {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--stand);
  border-top: 1px solid var(--about-edge);
}

.page-about .about-reach__grid {
  display: grid;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 42px);
  grid-template-columns: 1fr;
}

.page-about .about-reach__cell {
  position: relative;
  padding: 22px 20px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-edge);
  background: rgba(10, 46, 40, .7);
  overflow: hidden;
  transition: transform var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

.page-about .about-reach__cell::after {
  content: "";
  position: absolute;
  right: -34px;
  top: -34px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245, 194, 66, .22), transparent 68%);
  transition: transform var(--speed) var(--ease);
}

.page-about .about-reach__cell:hover,
.page-about .about-reach__cell:focus-visible {
  transform: translateY(-4px);
  border-color: var(--about-edge-strong);
}

.page-about .about-reach__cell:hover::after,
.page-about .about-reach__cell:focus-visible::after {
  transform: scale(1.5);
}

.page-about .about-reach__num {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-reach__num .display-num {
  color: var(--yellow);
}

.page-about .about-reach__unit {
  font-size: 12px;
  color: var(--mist);
}

.page-about .about-reach__label {
  margin: 10px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--neon);
}

.page-about .about-reach__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(241, 251, 246, .76);
}

.page-about .about-reach__more {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-edge-strong);
  font-size: 13px;
  line-height: 1.75;
  color: var(--green);
}

/* ---------- 数据整理 ---------- */

.page-about .about-data {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--paper);
  color: var(--ink);
}

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

.page-about .about-data__title {
  margin: 10px 0 20px;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.2;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-data__body p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.9;
  color: #2b3a35;
}

.page-about .about-data__figure {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--night);
}

.page-about .about-data__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.55) brightness(.72) contrast(1.06);
}

.page-about .about-data__caption {
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
  background: var(--night);
}

/* ---------- 内容合作 ---------- */

.page-about .about-partners {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--pitch);
  border-top: 1px solid var(--about-edge);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 42px);
  grid-template-columns: 1fr;
}

.page-about .about-partners__card {
  position: relative;
  padding: 24px 22px;
  border-radius: var(--r-lg);
  background: var(--night);
  border: 1px solid var(--about-edge);
}

.page-about .about-partners__card--wide {
  background: linear-gradient(120deg, rgba(226, 58, 46, .16), rgba(11, 27, 58, .9) 62%);
  border-color: rgba(226, 58, 46, .4);
}

.page-about .about-partners__num {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-partners__num .display-num {
  color: var(--green);
}

.page-about .about-partners__card--wide .about-partners__num .display-num {
  color: var(--yellow);
}

.page-about .about-partners__unit {
  font-size: 12px;
  color: var(--mist);
}

.page-about .about-partners__name {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--neon);
}

.page-about .about-partners__card p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(241, 251, 246, .78);
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  padding: clamp(44px, 7vw, 84px) 0 clamp(56px, 9vw, 104px);
  background: var(--pitch);
}

.page-about .about-next__inner {
  display: grid;
  gap: 26px;
  grid-template-columns: 1fr;
  padding-top: clamp(26px, 4vw, 40px);
  border-top: 2px solid rgba(245, 194, 66, .5);
}

.page-about .about-next__title {
  margin: 10px 0 14px;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.24;
  font-weight: 800;
  color: var(--neon);
}

.page-about .about-next__text p:last-child {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(241, 251, 246, .8);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .about-reach__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partners__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partners__card--wide {
    grid-column: 1 / -1;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-timeline__rail {
    padding-left: 40px;
  }

  .page-about .about-timeline__rail::before {
    left: 9px;
  }

  .page-about .about-timeline__node {
    padding-bottom: 30px;
  }

  .page-about .about-timeline__node::before {
    left: -40px;
    width: 14px;
    height: 14px;
  }

  .page-about .about-team__units {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-data__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-data__figure {
    position: sticky;
    top: 84px;
  }

  .page-about .about-reach__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-partners__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-partners__card--wide {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-reach__cell,
  .page-about .about-reach__cell::after {
    transition: none;
  }
}