.page-about {
  --about-col: 64px;
  --about-rule: 1px solid var(--grid);
  display: block;
}

@media (min-width: 720px) {
  .page-about { --about-col: 88px; }
}

/* ---------- 通用 ---------- */
.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-sec {
  padding: clamp(48px, 7vw, 100px) 0 0;
}

.page-about .about-sec--tail {
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .about-sec__title {
  margin: var(--sp-3) 0 0;
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--white);
  max-width: 22em;
}

.page-about .prose h2 {
  margin: 0 0 var(--sp-2);
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .prose p {
  margin: 0 0 var(--sp-3);
  max-width: 34em;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--mist);
}

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

.page-about .prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-24);
  transition: border-color .18s var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 76px) 0 var(--sp-5);
  border-bottom: var(--about-rule);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: .5;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 76%);
  pointer-events: none;
}

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

.page-about .about-hero__title {
  margin: var(--sp-3) 0 0;
  max-width: 15em;
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -.025em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: var(--sp-4) 0 0;
  max-width: 32em;
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 首屏数字带 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: var(--sp-5) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: var(--about-rule);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--sp-3);
  background: var(--deep);
}

.page-about .about-stats__value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 7vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats__unit {
  margin-left: 3px;
  font-size: .48em;
  font-weight: 500;
  color: var(--grey);
}

.page-about .about-stats__label {
  font-size: var(--fs-label);
  letter-spacing: .16em;
  color: var(--grey);
}

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

/* ---------- 横幅 ---------- */
.page-about .about-band {
  margin-top: var(--sp-5);
}

.page-about .about-band .figure__frame {
  border: var(--about-rule);
  background: var(--navy);
}

/* ---------- 非对称分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: var(--sp-4);
  margin-top: var(--sp-4);
}

.page-about .about-split--flip { margin-top: var(--sp-5); }

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: 5fr 7fr;
    gap: var(--sp-6);
    align-items: start;
  }
  .page-about .about-split--flip {
    grid-template-columns: 7fr 5fr;
  }
}

.page-about .about-quote {
  margin: 0;
  padding-left: var(--sp-3);
  border-left: 2px solid var(--cyan);
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -.01em;
  color: var(--white);
}

/* ---------- 时间轴 ---------- */
.page-about .about-axis {
  list-style: none;
  margin: var(--sp-5) 0 0;
  padding: 0;
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-col) minmax(0, 1fr);
  gap: var(--sp-3);
  padding: var(--sp-4) 0;
  border-top: var(--about-rule);
}

.page-about .about-node:last-child {
  border-bottom: var(--about-rule);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--grid);
}

.page-about .about-node:first-child::before { top: 36px; }
.page-about .about-node:last-child::before { bottom: auto; height: 36px; }

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

.page-about .about-node__gauge::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--deep);
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .about-node.is-current .about-node__gauge::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-12);
}

.page-about .about-node__ver {
  display: block;
  margin-top: var(--sp-3);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--cyan);
}

.page-about .about-node.is-current .about-node__ver {
  color: var(--white);
}

.page-about .about-node__phase {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-label);
  letter-spacing: .16em;
  color: var(--grey);
}

.page-about .about-node__title {
  margin: 0;
  font-size: var(--fs-h3);
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .about-node__text {
  margin: var(--sp-2) 0 0;
  max-width: 34em;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-node__more {
  display: grid;
  grid-template-rows: 1fr;
  margin-top: var(--sp-2);
  transition: grid-template-rows .32s var(--ease), opacity .32s var(--ease);
}

.page-about .about-node__more > p {
  overflow: hidden;
  margin: 0;
  padding-left: var(--sp-2);
  border-left: 2px solid var(--cyan-24);
  max-width: 34em;
  font-size: var(--fs-sm);
  line-height: 1.72;
  color: var(--grey);
}

@media (min-width: 900px) {
  .page-about .about-node {
    gap: var(--sp-5);
    padding: var(--sp-5) 0;
  }
  .page-about .about-node:first-child::before { top: 52px; }
  .page-about .about-node:last-child::before { height: 52px; }

  .page-about .about-node__more {
    grid-template-rows: 0fr;
    opacity: 0;
  }
  .page-about .about-node:hover .about-node__more,
  .page-about .about-node:focus-within .about-node__more,
  .page-about .about-node.is-current .about-node__more {
    grid-template-rows: 1fr;
    opacity: 1;
  }
}

/* ---------- 团队数字 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: var(--about-rule);
}

.page-about .about-team__fig {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--sp-3);
  background: var(--deep);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 8vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__fig:last-child .about-team__num {
  color: var(--grey);
}

.page-about .about-team__cap {
  font-size: var(--fs-label);
  letter-spacing: .16em;
  color: var(--grey);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-scale {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4) var(--sp-3);
  border-top: var(--about-rule);
  padding-top: var(--sp-4);
}

.page-about .about-scale__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: var(--sp-2);
  border-left: 1px solid var(--grid);
}

.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 8vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-scale__unit {
  margin-left: 3px;
  font-size: .42em;
  font-weight: 500;
  color: var(--cyan);
}

.page-about .about-scale__cap {
  font-size: var(--fs-label);
  letter-spacing: .16em;
  color: var(--grey);
}

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

/* ---------- 主体信息收尾 ---------- */
.page-about .about-sec--tail .plate {
  margin-top: var(--sp-4);
}

.page-about .about-sec--tail .prose {
  margin-top: var(--sp-4);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-4);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__more,
  .page-about .about-node__gauge::before,
  .page-about .prose a {
    transition: none;
  }
  .page-about .about-node__more {
    grid-template-rows: 1fr;
    opacity: 1;
  }
}