.page-about {
  --about-shell-gap: 40px;
  --about-rail-w: 216px;
  --about-text: #33463F;
  background: var(--bx-ink);
  color: var(--bx-mint);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 104px 0 52px;
  border-bottom: 1px solid var(--bx-line);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(47, 227, 180, .10), rgba(8, 38, 31, 0) 58%),
    var(--bx-ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -18%;
  width: 74%;
  height: 168%;
  background: linear-gradient(158deg, rgba(47, 227, 180, .16), rgba(8, 38, 31, 0) 62%);
  transform: skewY(-9deg);
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 42%;
  height: 3px;
  background: linear-gradient(90deg, var(--bx-cyan), rgba(47, 227, 180, 0));
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 28px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--bx-gray);
}

.page-about .about-hero .breadcrumb a {
  color: var(--bx-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--bx-ease), border-color .18s var(--bx-ease);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--bx-cyan);
  border-bottom-color: var(--bx-cyan);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  padding-left: 14px;
  position: relative;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--bx-cyan);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: .35em;
  width: 3px;
  height: 12px;
  background: var(--bx-cyan);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: 30px;
  line-height: 1.24;
  letter-spacing: -.01em;
  font-weight: 800;
  color: #FFFFFF;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--bx-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--bx-line);
  border: 1px solid var(--bx-line);
}

.page-about .about-stat {
  padding: 18px 16px;
  background: rgba(15, 58, 46, .68);
}

.page-about .about-stat__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--bx-gray);
}

.page-about .about-stat__value {
  margin: 0;
  font-family: var(--bx-font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--bx-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__value--warm {
  color: var(--bx-orange);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-shell {
  padding-top: 48px;
  padding-bottom: 72px;
}

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

.page-about .about-chapters {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  scroll-margin-top: calc(var(--bx-nav-h) + 28px);
  padding: 30px 22px 34px;
  border: 1px solid var(--bx-line);
  background: rgba(15, 58, 46, .40);
}

.page-about .about-chapter--paper {
  background: var(--bx-paper);
  border-color: rgba(8, 38, 31, .14);
  color: var(--bx-text, var(--about-text));
}

.page-about .about-chapter .chapter-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--bx-line);
}

.page-about .about-chapter--paper .chapter-head {
  border-bottom-color: rgba(8, 38, 31, .14);
}

.page-about .about-chapter .chapter-num {
  font-family: var(--bx-font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.04em;
  color: rgba(47, 227, 180, .30);
  flex: none;
}

.page-about .about-chapter--paper .chapter-num {
  color: rgba(8, 38, 31, .20);
}

.page-about .about-chapter .chapter-title {
  margin: 0;
  font-size: 20px;
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #FFFFFF;
}

.page-about .about-chapter--paper .chapter-title {
  color: var(--bx-ink);
}

.page-about .about-text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--bx-dim);
}

.page-about .about-chapter--paper .about-text {
  color: var(--about-text);
}

.page-about .about-text:last-child {
  margin-bottom: 0;
}

.page-about .about-text--aside {
  margin-top: 20px;
  padding: 14px 16px;
  border-left: 2px solid var(--bx-moss);
  background: rgba(75, 122, 94, .12);
  font-size: 14px;
  color: var(--bx-dim);
}

/* ---------- 三道流程 ---------- */

.page-about .about-flow {
  list-style: none;
  margin: 24px 0 20px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: rgba(8, 38, 31, .16);
}

.page-about .about-flow__item {
  display: flex;
  gap: 16px;
  padding: 18px 16px;
  background: var(--bx-paper);
}

.page-about .about-flow__num {
  flex: none;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  font-family: var(--bx-font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--bx-ink);
  background: rgba(47, 227, 180, .55);
}

.page-about .about-flow__body {
  min-width: 0;
}

.page-about .about-flow__title {
  margin: 2px 0 8px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
  color: var(--bx-ink);
}

.page-about .about-flow__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-text);
}

/* ---------- 团队卡片 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0 4px;
}

.page-about .about-team__card {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--bx-line);
  background: rgba(8, 38, 31, .55);
  transition: border-color .2s var(--bx-ease), transform .2s var(--bx-ease), background .2s var(--bx-ease);
}

.page-about .about-team__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--bx-moss);
  transition: background .2s var(--bx-ease);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  border-color: rgba(47, 227, 180, .45);
  background: rgba(15, 58, 46, .78);
  transform: translateY(-2px);
}

.page-about .about-team__card:hover::before,
.page-about .about-team__card:focus-within::before {
  background: var(--bx-cyan);
}

.page-about .about-team__role {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--bx-cyan);
}

.page-about .about-team__count {
  display: inline-block;
  margin: 0;
  font-family: var(--bx-font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--bx-orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__unit {
  display: inline-block;
  margin: 0 0 0 6px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--bx-gray);
}

.page-about .about-team__desc {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--bx-line);
  font-size: 14px;
  line-height: 1.72;
  color: var(--bx-dim);
}

/* ---------- 覆盖条形图 ---------- */

.page-about .about-bars {
  list-style: none;
  margin: 24px 0 22px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "name num"
    "track track";
  gap: 8px 12px;
  align-items: center;
}

.page-about .about-bar__name {
  grid-area: name;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--bx-ink);
}

.page-about .about-bar__num {
  grid-area: num;
  font-family: var(--bx-font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
  color: var(--bx-ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-bar__track {
  grid-area: track;
  display: block;
  height: 8px;
  background: rgba(8, 38, 31, .10);
  overflow: hidden;
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--bx-moss), var(--bx-cyan));
}

.page-about .about-bar__fill--full { width: 100%; }
.page-about .about-bar__fill--mid { width: 39%; }
.page-about .about-bar__fill--wide { width: 67%; }
.page-about .about-bar__fill--small { width: 37%; }

/* ---------- 成长节点时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--bx-line);
}

.page-about .about-mile {
  position: relative;
  padding-left: 26px;
}

.page-about .about-mile__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--bx-cyan);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(47, 227, 180, .14);
}

.page-about .about-mile__when {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--bx-gray);
}

.page-about .about-mile__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #FFFFFF;
}

.page-about .about-mile__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--bx-dim);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 24px 0 4px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.72) contrast(1.02);
}

.page-about .about-chapter--paper .media-frame__cap,
.page-about .about-figure .media-frame__cap {
  font-size: 12px;
  letter-spacing: .04em;
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  margin-top: 8px;
  padding: 30px 22px 32px;
  border: 1px solid var(--bx-line);
  background:
    linear-gradient(140deg, rgba(47, 227, 180, .12), rgba(8, 38, 31, 0) 58%),
    var(--bx-ink-deep);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #FFFFFF;
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--bx-dim);
}

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

/* ---------- 中等屏幕 ---------- */

@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 116px 0 64px;
  }

  .page-about .about-hero__title {
    font-size: 38px;
  }

  .page-about .about-hero__lead {
    font-size: 16px;
  }

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

  .page-about .about-chapter {
    padding: 38px 34px 42px;
  }

  .page-about .about-chapter .chapter-num {
    font-size: 38px;
  }

  .page-about .about-chapter .chapter-title {
    font-size: 24px;
  }

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

  .page-about .about-flow__item {
    padding: 20px 22px;
  }

  .page-about .about-cta {
    padding: 40px 38px 42px;
  }

  .page-about .about-cta__title {
    font-size: 24px;
  }

  .page-about .about-timeline {
    gap: 30px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding: 132px 0 76px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-hero__title {
    font-size: 44px;
  }

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

  .page-about .about-stat__value {
    font-size: 30px;
  }

  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-shell-gap);
    align-items: start;
    padding-top: 64px;
    padding-bottom: 96px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--bx-nav-h) + 32px);
    align-self: start;
  }

  .page-about .about-rail__title {
    margin: 0 0 16px 21px;
    font-size: 11px;
    letter-spacing: .16em;
    color: var(--bx-gray);
  }

  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 4px 0 4px 20px;
    border-left: 1px solid var(--bx-line);
  }

  .page-about .about-rail__list li {
    position: relative;
  }

  .page-about .about-rail__list li::before {
    content: "";
    position: absolute;
    left: -24px;
    top: 16px;
    width: 7px;
    height: 7px;
    background: var(--bx-line);
    transform: rotate(45deg);
    transition: background .18s var(--bx-ease), box-shadow .18s var(--bx-ease);
  }

  .page-about .about-rail__list li:has(a[aria-current="true"])::before {
    background: var(--bx-cyan);
    box-shadow: 0 0 0 4px rgba(47, 227, 180, .16);
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 0;
    font-size: 13px;
    line-height: 1.5;
    text-decoration: none;
    color: var(--bx-gray);
    transition: color .18s var(--bx-ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--bx-mint);
  }

  .page-about .about-rail__link[aria-current="true"] {
    color: var(--bx-cyan);
  }

  .page-about .about-rail__num {
    font-family: var(--bx-font-mono);
    font-size: 11px;
    letter-spacing: .04em;
    opacity: .7;
  }

  .page-about .about-chapter {
    padding: 44px 46px 50px;
  }

  .page-about .about-chapter .chapter-head {
    gap: 20px;
    margin-bottom: 24px;
    padding-bottom: 20px;
  }

  .page-about .about-chapter .chapter-num {
    font-size: 46px;
  }

  .page-about .about-chapter .chapter-title {
    font-size: 26px;
  }

  .page-about .about-text {
    font-size: 16px;
  }

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

  .page-about .about-team__desc {
    font-size: 13px;
  }

  .page-about .about-timeline {
    padding-left: 6px;
  }

  .page-about .about-timeline::before {
    left: 10px;
  }

  .page-about .about-mile {
    padding-left: 34px;
  }

  .page-about .about-mile__dot {
    left: 6px;
    top: 7px;
  }

  .page-about .about-cta {
    padding: 48px 48px 52px;
  }
}

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-rail__link,
  .page-about .about-rail__list li::before,
  .page-about .about-hero .breadcrumb a {
    transition: none;
  }

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

.page-about {
  --bx-text: currentColor;
}