.page-about {
  --about-rail-w: 140px;
  --about-gap: clamp(20px, 3.6vw, 52px);
  position: relative;
  isolation: isolate;
}

.page-about [hidden] {
  display: none !important;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(51, 68, 63, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(51, 68, 63, 0.5) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.16;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 42%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 42%);
}

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

.page-about__crumbs {
  padding-top: 10px;
  padding-bottom: 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(14px, 2.6vw, 30px) 0 clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-hero__rail {
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-about .about-rail {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 8px;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 9px;
  border-left: 2px solid rgba(51, 68, 63, 0.7);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
  text-decoration: none;
  transition: color 150ms var(--ease), border-color 150ms var(--ease), background-color 150ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
  background-color: var(--graphite);
}

.page-about .about-hero__main h1 {
  margin: 0 0 18px;
  font-size: clamp(32px, 6.2vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-hero__ver {
  font-family: var(--font-mono);
  font-size: 0.76em;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-hero__main .lead {
  max-width: 64ch;
  margin: 0 0 22px;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-strip {
  margin: clamp(28px, 4vw, 46px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid rgba(51, 68, 63, 0.6);
}

.page-about .about-strip__cell {
  padding: 14px 14px 16px;
  border-right: 1px solid rgba(51, 68, 63, 0.6);
  border-bottom: 1px solid rgba(51, 68, 63, 0.6);
  background: linear-gradient(180deg, rgba(12, 31, 27, 0.92), rgba(5, 16, 13, 0.55));
}

.page-about .about-strip__cell dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin-bottom: 8px;
}

.page-about .about-strip__cell dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.4vw, 28px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: clamp(22px, 3.6vw, 40px) 0 0;
  padding: 0;
}

.page-about .about-tl__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: clamp(18px, 2.6vw, 30px) 0;
  border-top: 1px solid rgba(51, 68, 63, 0.7);
}

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

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: clamp(23px, 3vw, 33px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-tl__body p {
  margin: 0;
  max-width: 70ch;
  color: var(--muted);
}

.page-about .about-tl__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-tl__stats b {
  color: var(--paper);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.page-about .about-tl-foot {
  margin-top: clamp(24px, 3.6vw, 42px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-tl-foot__lead {
  margin: 0 0 16px;
  max-width: 62ch;
  color: var(--muted);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  filter: saturate(0.55) contrast(1.05);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted);
}

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

/* ---------- 服务能力 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-split__rail {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-split__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .about-split__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-split__desc {
  margin: 0;
  color: var(--muted);
  max-width: 34ch;
}

.page-about .about-svc {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-svc__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 18px 14px;
  border-top: 1px solid rgba(51, 68, 63, 0.7);
  border-left: 2px solid transparent;
  transition: background-color 150ms var(--ease), border-left-color 150ms var(--ease);
}

.page-about .about-svc__item:last-child {
  border-bottom: 1px solid rgba(51, 68, 63, 0.7);
}

.page-about .about-svc__item:hover {
  background-color: var(--graphite);
  border-left-color: var(--cyan);
}

.page-about .about-svc__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding-top: 4px;
}

.page-about .about-svc__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-svc__body p {
  margin: 0;
  max-width: 72ch;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 20px;
}

.page-about .about-team__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-team__card {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, var(--ink-deep), var(--ink) 78%);
  transition: border-color 180ms var(--ease);
}

.page-about .about-team__card:hover {
  border-color: rgba(43, 240, 200, 0.5);
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__unit {
  font-size: 0.42em;
  margin-left: 6px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-team__name {
  margin: 14px 0 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-team__duty {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-team__empty {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 节点 ---------- */
.page-about .about-nodes__map {
  margin-top: 22px;
  padding: 12px;
  border: 1px solid rgba(51, 68, 63, 0.8);
  border-radius: var(--r-md);
  background-color: var(--ink-deep);
}

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

.page-about .about-nodes {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: rgba(51, 68, 63, 0.8);
  border: 1px solid rgba(51, 68, 63, 0.8);
}

.page-about .about-nodes__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background-color: var(--ink);
}

.page-about .about-nodes__dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--cyan);
  box-shadow: 0 0 10px rgba(43, 240, 200, 0.6);
}

.page-about .about-nodes__name {
  font-size: 14.5px;
  color: var(--paper);
}

.page-about .about-nodes__note {
  margin-top: 22px;
  padding: 18px 20px;
  border-left: 2px solid var(--cyan);
  background: linear-gradient(90deg, rgba(15, 58, 50, 0.7), rgba(5, 16, 13, 0));
}

.page-about .about-nodes__note p {
  margin: 0;
  max-width: 76ch;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background-color: rgba(51, 68, 63, 0.8);
  border: 1px solid rgba(51, 68, 63, 0.8);
}

.page-about .about-eco__item {
  padding: 22px 20px;
  background-color: var(--ink);
}

.page-about .about-eco__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .about-eco__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-eco__unit {
  font-size: 0.42em;
  margin-left: 6px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-eco__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-eco__link {
  display: inline-block;
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 240, 200, 0.4);
  padding-bottom: 2px;
  transition: border-color 150ms var(--ease), color 150ms var(--ease);
}

.page-about .about-eco__link:hover,
.page-about .about-eco__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 长期使用 ---------- */
.page-about .about-stay {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-stay__lead p {
  margin: 0 0 14px;
  max-width: 62ch;
  color: var(--muted);
}

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

.page-about .about-stay__figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background-color: rgba(51, 68, 63, 0.8);
  border: 1px solid rgba(51, 68, 63, 0.8);
}

.page-about .about-stay__figures li {
  padding: 18px 16px;
  background-color: var(--ink-deep);
}

.page-about .about-stay__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stay__unit {
  font-size: 0.42em;
  margin-left: 4px;
  color: var(--cyan);
}

.page-about .about-stay__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 尾部指引 ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: center;
  padding: clamp(24px, 3.6vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(43, 240, 200, 0.12), transparent 58%),
    linear-gradient(160deg, var(--ink-deep), var(--ink) 82%);
}

.page-about .about-cta__text h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 64ch;
  color: var(--muted);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-hero__rail {
    position: sticky;
    top: calc(var(--header-offset) + 12px);
  }

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  }

  .page-about .about-tl__item {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 0 var(--about-gap);
  }

  .page-about .about-tl__rail {
    position: relative;
    display: block;
    padding-left: 16px;
    border-left: 2px solid var(--line);
  }

  .page-about .about-tl__rail::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 6px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--cyan);
    box-shadow: 0 0 0 4px rgba(43, 240, 200, 0.14);
  }

  .page-about .about-tl__ver {
    display: block;
    margin-top: 6px;
  }

  .page-about .about-tl-foot {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-stay {
    grid-template-columns: minmax(0, 1fr) minmax(0, 460px);
  }

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

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

@media (min-width: 1024px) {
  .page-about .about-strip {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-svc__item,
  .page-about .about-team__card,
  .page-about .about-eco__link {
    transition: none;
  }
}