.page-about {
  --about-rail-w: 200px;
  --about-gap: 72px;
  display: block;
}

.page-about .about-crumb {
  padding-top: 22px;
}

.page-about .about-crumb .breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
}

.page-about .about-crumb .breadcrumb a:hover {
  color: var(--glow);
}

/* ---------- 首屏文字建筑 ---------- */
.page-about .about-hero {
  padding: 26px 0 60px;
}

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

.page-about .about-hero h1.display-1 {
  margin: 16px 0 0;
  font-size: clamp(36px, 8.4vw, 74px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  margin: 24px 0 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 18px 20px;
  margin: 36px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-hero__facts dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-hero__facts dd {
  margin: 9px 0 0;
  font-family: var(--font-mono);
  font-size: 21px;
  color: var(--glow);
  letter-spacing: -0.01em;
}

.page-about .about-hero__media {
  position: relative;
  border-radius: 4px;
  box-shadow: var(--shadow-card);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 4px;
  border: 1px solid rgba(232, 179, 59, 0.28);
  pointer-events: none;
}

/* ---------- 布局与右侧章节索引 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 40px;
  padding-bottom: 84px;
}

.page-about .about-rail {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 16px 0;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-rail__list {
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list li {
  flex: 0 0 auto;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  font-size: 14px;
  color: var(--text-dim);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color 240ms var(--ease), border-color 240ms var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--red);
}

.page-about .about-rail .coord {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--wave);
  box-shadow: 0 0 10px rgba(46, 158, 155, 0.7);
}

/* ---------- 章节与长文 ---------- */
.page-about .about-body .section {
  padding: 50px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-body .section:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-about .about-body .display-2 {
  margin: 12px 0 0;
  font-size: clamp(26px, 4.6vw, 40px);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-body .prose {
  margin: 22px 0 0;
  max-width: 38em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-body .prose + .prose {
  margin-top: 16px;
}

/* ---------- 时间线 ---------- */
.page-about .about-track__figure {
  margin: 32px 0 0;
  border-radius: 4px;
}

.page-about .track {
  position: relative;
  margin: 40px 0 0;
  padding: 4px 0 0 26px;
  list-style: none;
  border-left: 1px solid rgba(232, 179, 59, 0.34);
}

.page-about .track__node {
  position: relative;
  padding-bottom: 40px;
}

.page-about .track__node:last-child {
  padding-bottom: 0;
}

.page-about .track__node::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(232, 179, 59, 0.12), 0 0 16px rgba(232, 179, 59, 0.55);
}

.page-about .track__year {
  display: inline-block;
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--glow);
}

.page-about .track__body h3 {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .track__body p {
  margin: 10px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .track__stat {
  display: inline-block;
  margin: 16px 0 0;
  padding: 9px 14px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gold-light);
  background: linear-gradient(90deg, rgba(46, 158, 155, 0.16), rgba(46, 158, 155, 0));
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--wave);
  border-radius: 2px;
}

/* ---------- 三条主线 ---------- */
.page-about .pillars {
  display: grid;
  gap: 26px;
  margin: 34px 0 0;
}

.page-about .pillar {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 28px 24px 24px;
  border-radius: 4px;
  overflow: hidden;
}

.page-about .pillar--b {
  border-left: 2px solid var(--red);
}

.page-about .pillar--c {
  border-left: 2px solid var(--glow);
}

.page-about .pillar__no {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 46px;
  line-height: 1;
  font-weight: 700;
  color: rgba(232, 179, 59, 0.16);
  pointer-events: none;
}

.page-about .pillar h3 {
  margin: 0;
  max-width: 22em;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .pillar p {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .pillar__link {
  margin-top: auto;
  padding-top: 20px;
}

.page-about .pillar__link a {
  display: inline-block;
  font-size: 15px;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 179, 59, 0.42);
  padding-bottom: 2px;
  transition: color 240ms var(--ease), border-color 240ms var(--ease);
}

.page-about .pillar__link a:hover {
  color: var(--gold-light);
  border-bottom-color: var(--gold-light);
}

/* ---------- 内容与协作 ---------- */
.page-about .eco {
  display: grid;
  gap: 34px;
  margin-top: 26px;
}

.page-about .eco__figure {
  margin: 0;
  border-radius: 4px;
}

.page-about .eco__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .eco__tags .tag {
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 2px;
}

/* ---------- 团队与响应 ---------- */
.page-about .crew {
  margin: 32px 0 0;
  padding: 0 0 0 24px;
  list-style: none;
  border-left: 1px solid var(--line-soft);
}

.page-about .crew__item {
  position: relative;
  padding-bottom: 30px;
}

.page-about .crew__item:last-child {
  padding-bottom: 0;
}

.page-about .crew__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--wave);
}

.page-about .crew__role {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--glow);
}

.page-about .crew__item p + p {
  margin: 10px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .sla {
  display: grid;
  gap: 1px;
  margin-top: 34px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  overflow: hidden;
}

.page-about .sla__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 22px;
  background: linear-gradient(160deg, rgba(14, 44, 76, 0.9), rgba(7, 26, 47, 0.95));
}

.page-about .sla__num {
  font-size: 22px;
  color: var(--gold);
  letter-spacing: -0.01em;
}

.page-about .sla__num .sla__unit {
  font-size: 13px;
  margin-left: 4px;
  color: var(--gold-light);
}

.page-about .sla__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 覆盖与用户 ---------- */
.page-about .reach {
  display: grid;
  gap: 30px;
  margin-top: 32px;
}

.page-about .reach__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 18px;
}

.page-about .reach__stat {
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--glow);
  border-radius: 3px;
  background: linear-gradient(180deg, rgba(46, 158, 155, 0.12), rgba(7, 26, 47, 0));
}

.page-about .reach__num {
  display: block;
  font-size: clamp(28px, 5vw, 36px);
  color: var(--glow);
  text-shadow: 0 0 20px rgba(127, 227, 212, 0.32);
  letter-spacing: -0.02em;
}

.page-about .reach__num .reach__unit {
  font-size: 14px;
  margin-left: 4px;
  color: var(--paper);
  opacity: 0.72;
}

.page-about .reach__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .zones {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  background: rgba(14, 44, 76, 0.34);
}

.page-about .zones__title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .zones__list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .zones__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  color: var(--text-body);
  padding-left: 2px;
}

.page-about .zones__item .coord {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--wave);
  flex: 0 0 auto;
  transform: translateY(-2px);
}

.page-about .zones__item--hero {
  color: var(--paper);
  font-weight: 600;
}

.page-about .zones__item--hero .coord {
  background: var(--red);
  box-shadow: 0 0 10px rgba(200, 16, 46, 0.8);
}

.page-about .zones__item em {
  font-style: normal;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

/* ---------- 结尾路径 ---------- */
.page-about .about-next {
  padding-bottom: 20px;
}

.page-about .route-list {
  display: grid;
  gap: 1px;
  margin-top: 30px;
  border-top: 1px solid var(--line-soft);
}

.page-about .route-list__item {
  display: grid;
  grid-template-columns: 44px 1fr;
  align-items: baseline;
  gap: 4px 12px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line-soft);
  text-decoration: none;
  transition: background 240ms var(--ease), padding-left 240ms var(--ease);
}

.page-about .route-list__item:hover,
.page-about .route-list__item:focus-visible {
  background: rgba(46, 158, 155, 0.09);
  padding-left: 12px;
}

.page-about .route-list__idx {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .route-list__name {
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--paper);
}

.page-about .route-list__desc {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 34px 0 72px;
  }

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

  .page-about .reach {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .eco {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
    gap: 46px;
  }

  .page-about .eco__figure {
    margin-top: 26px;
  }

  .page-about .route-list__item {
    grid-template-columns: 52px 240px 1fr;
    align-items: baseline;
  }

  .page-about .route-list__desc {
    grid-column: 3;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .pillars {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 56px 30px;
    padding-bottom: 40px;
  }

  .page-about .pillar--a {
    grid-column: 1 / span 7;
  }

  .page-about .pillar--b {
    grid-column: 8 / span 5;
    transform: translateY(38px);
  }

  .page-about .pillar--c {
    grid-column: 3 / span 7;
  }
}

@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) var(--about-rail-w);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-body {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-rail {
    grid-column: 2;
    grid-row: 1;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    border-top: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
    padding: 2px 0 2px 22px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 14px;
    overflow: visible;
    padding-bottom: 0;
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__facts {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .pillar {
    padding: 24px 18px 20px;
  }

  .page-about .track {
    padding-left: 20px;
  }

  .page-about .track__node::before {
    left: -25px;
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>