.page-about {
  --rail-w: 104px;
  --bar-analyst: var(--c-orange);
  --bar-engineer: var(--c-blue);
  --bar-editor: var(--c-gold);
  background: var(--c-green-800);
  color: var(--c-snow);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 20px;
  padding-bottom: 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 52px;
  background:
    radial-gradient(120% 90% at 88% 6%, rgba(46, 125, 91, .42) 0%, rgba(46, 125, 91, 0) 58%),
    linear-gradient(158deg, var(--c-green-800) 0%, var(--c-green-700) 62%, #0E4433 100%);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 34px;
  background: linear-gradient(to bottom, rgba(6, 28, 22, 0), rgba(6, 28, 22, .30));
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 34px;
}

.page-about .about-hero__copy .eyebrow {
  color: var(--c-blue-200);
}

.page-about .about-hero h1 {
  margin: 12px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.4vw, 52px);
  font-weight: 900;
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--c-snow);
}

.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: 64px;
  height: 6px;
  margin-top: 18px;
  background: var(--c-orange);
}

.page-about .about-hero .lede {
  max-width: 46ch;
  color: rgba(247, 250, 248, .86);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-light);
}

.page-about .hero-stat {
  padding-right: 10px;
  border-right: 1px solid var(--line-soft);
}

.page-about .hero-stat:last-child {
  border-right: 0;
}

.page-about .hero-stat dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(185, 212, 255, .82);
}

.page-about .hero-stat dd {
  margin: 6px 0 0;
  font-size: 15px;
  color: var(--c-snow);
}

.page-about .hero-stat__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--c-gold);
  border-bottom: 1px dashed rgba(232, 177, 74, .55);
  padding-bottom: 2px;
}

.page-about .hero-figure {
  position: relative;
  margin: 0;
}

.page-about .hero-figure::before {
  content: "";
  position: absolute;
  top: 12px;
  right: -10px;
  bottom: -10px;
  left: 14px;
  background: var(--c-orange);
  clip-path: polygon(0 0, 100% 0, 100% 80%, 0 100%);
  opacity: .92;
}

.page-about .hero-figure img {
  position: relative;
  display: block;
  width: 100%;
  height: auto;
  clip-path: polygon(0 0, 100% 0, 100% 80%, 0 100%);
  object-fit: cover;
}

/* ---------- 主体与章节 ---------- */
.page-about .about-body {
  background: var(--c-green-800);
  padding: 8px 0 12px;
}

.page-about .chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  padding: 44px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .chapter:first-child {
  border-top: 0;
  padding-top: 36px;
}

.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
  letter-spacing: -.02em;
}

.page-about .chapter__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .10em;
  color: var(--c-blue-200);
  padding: 4px 9px;
  border: 1px solid var(--line);
  background: rgba(6, 28, 22, .35);
  clip-path: polygon(0 0, 100% 0, 100% 68%, calc(100% - 8px) 100%, 0 100%);
}

.page-about .chapter-list > .chapter:nth-child(2) .chapter__num { color: #F0601F; }
.page-about .chapter-list > .chapter:nth-child(3) .chapter__num { color: #E05A1C; }
.page-about .chapter-list > .chapter:nth-child(4) .chapter__num { color: #D4521A; }
.page-about .chapter-list > .chapter:nth-child(5) .chapter__num { color: var(--c-orange-700); }

.page-about .chapter__main > .eyebrow {
  color: var(--c-green-500);
}

.page-about .chapter__title {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(22px, 4.4vw, 34px);
  font-weight: 800;
  line-height: 1.24;
  color: var(--c-snow);
}

.page-about .chapter__main > p {
  max-width: 62ch;
  color: rgba(247, 250, 248, .80);
}

.page-about .chapter__figure {
  margin: 30px 0 0;
}

.page-about .chapter__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .chapter__figure .figure__caption {
  margin-top: 10px;
  font-size: 12px;
  color: rgba(247, 250, 248, .58);
}

/* 时间轴微调 */
.page-about .chapter__timeline {
  margin: 26px 0 0;
}

.page-about .chapter__timeline .timeline__time {
  font-family: var(--font-mono);
  color: var(--c-orange);
  font-weight: 700;
}

/* ---------- 团队比例 ---------- */
.page-about .team-bars {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .team-bar {
  padding: 18px 18px 16px;
  background: rgba(6, 28, 22, .42);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--c-green-500);
  box-shadow: var(--paper-shadow);
  transition: border-left-color .2s ease, transform .2s ease;
}

.page-about .team-bar:hover,
.page-about .team-bar:focus-within {
  border-left-color: var(--c-orange);
  transform: translateX(3px);
}

.page-about .team-bar__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .team-bar__role {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-snow);
}

.page-about .team-bar__count {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-gold);
}

.page-about .team-bar__track {
  height: 10px;
  background: rgba(247, 250, 248, .10);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
}

.page-about .team-bar__fill--a { width: 41%; background: var(--bar-analyst); }
.page-about .team-bar__fill--b { width: 26%; background: var(--bar-engineer); }
.page-about .team-bar__fill--c { width: 33%; background: var(--bar-editor); }

.page-about .team-bar__desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 250, 248, .74);
}

/* ---------- 数据流程 ---------- */
.page-about .flow {
  list-style: none;
  counter-reset: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .flow__step {
  position: relative;
  padding: 20px 18px 18px;
  background: linear-gradient(150deg, rgba(20, 82, 63, .78), rgba(6, 28, 22, .50));
  border: 1px solid var(--line);
}

.page-about .flow__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-orange);
  display: block;
  margin-bottom: 8px;
}

.page-about .flow__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 800;
  color: var(--c-snow);
}

.page-about .flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 250, 248, .76);
}

.page-about .method-note {
  margin-top: 22px;
  padding: 16px 18px;
  border-left: 6px solid var(--c-orange);
  background: rgba(232, 177, 74, .08);
}

.page-about .method-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 250, 248, .84);
}

.page-about .method-note strong {
  color: var(--c-gold);
}

/* ---------- 覆盖范围 ---------- */
.page-about .reach-grid {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .reach-copy p {
  margin: 0 0 16px;
  color: rgba(247, 250, 248, .80);
}

.page-about .cover-map {
  margin: 0;
  padding: 18px;
  background: rgba(6, 28, 22, .48);
  border: 1px solid var(--line-soft);
  box-shadow: var(--paper-shadow);
}

.page-about .cover-map svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .cover-map .figure__caption {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(247, 250, 248, .58);
}

.page-about .cover-dot circle {
  fill: var(--c-green-500);
}

.page-about .cover-dot--hot circle {
  fill: var(--c-orange);
}

.page-about .cover-dot--cool circle {
  fill: var(--c-blue);
}

/* ---------- 合作生态 ---------- */
.page-about .tabs {
  margin: 26px 0 0;
}

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 12px;
}

.page-about .tabs__panel {
  padding: 20px 0 4px;
  color: rgba(247, 250, 248, .80);
}

.page-about .tabs__panel p {
  margin: 0;
  max-width: 62ch;
}

.page-about .cred-grid {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .cred {
  padding: 20px 18px;
  background: var(--c-paper);
  color: var(--c-gray);
  border: 1px solid var(--line);
  box-shadow: var(--paper-shadow);
}

.page-about .cred__title {
  margin: 12px 0 10px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.42;
  color: var(--c-green-800);
}

.page-about .cred p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-gray);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: 12px;
  padding: 52px 0 62px;
  background: linear-gradient(170deg, var(--c-green-900) 0%, var(--c-green-900) 100%);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta .eyebrow {
  color: var(--c-green-500);
}

.page-about .about-cta h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(22px, 4.6vw, 32px);
  font-weight: 800;
  line-height: 1.28;
  color: var(--c-snow);
}

.page-about .about-cta p {
  max-width: 56ch;
  margin: 0;
  color: rgba(247, 250, 248, .76);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero {
    padding: 36px 0 66px;
  }

  .page-about .hero-stats {
    gap: 0;
  }

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

  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .flow__step::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -16px;
    width: 16px;
    height: 1px;
    background: var(--c-orange);
    opacity: .7;
  }

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

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

  .page-about .about-cta__inner {
    grid-template-columns: 1.5fr 1fr;
    align-items: center;
    gap: 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.02fr .98fr;
    align-items: center;
    gap: 48px;
  }

  .page-about .reach-grid {
    grid-template-columns: 1.15fr .85fr;
    align-items: start;
    gap: 36px;
  }

  .page-about .chapter {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: 40px;
    padding: 64px 0;
  }

  .page-about .chapter__rail {
    flex-direction: column;
    gap: 14px;
    position: sticky;
    top: calc(var(--nav-h) + 28px);
    align-self: start;
  }

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

  .page-about .chapter__tag {
    font-size: 11px;
  }
}

@media (min-width: 1080px) {
  .page-about .hero-stat__num {
    font-size: 30px;
  }
}