.page-about {
  --about-edge: clamp(18px, 4vw, 40px);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 40px) 0 clamp(40px, 6vw, 68px);
  background:
    radial-gradient(120% 90% at 82% 0%, rgba(47, 224, 176, .10) 0%, transparent 58%),
    radial-gradient(90% 80% at 8% 10%, rgba(255, 106, 43, .10) 0%, transparent 60%),
    linear-gradient(180deg, var(--night) 0%, #0C2138 62%, #0A1A2F 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--rock);
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .crumbs a {
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.page-about .crumbs__sep {
  color: var(--rock-deep);
}

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

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

.page-about .about-hero__lead .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--mint);
  margin-bottom: 16px;
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-size: clamp(32px, 6.4vw, 62px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--paper);
  margin: 0 0 20px;
}

.page-about .about-hero__lead .lede {
  max-width: 58ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  position: relative;
  padding: 16px 12px 16px 16px;
  background: var(--glass-bg);
  border: 1px solid var(--line);
  border-left: 2px solid var(--signal);
  backdrop-filter: blur(6px);
}

.page-about .about-stat__value {
  display: block;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: .02em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-dim);
}

/* ---------- 主框架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 36px;
  padding-top: clamp(38px, 6vw, 72px);
  padding-bottom: clamp(54px, 8vw, 96px);
}

/* ---------- 侧栏 ---------- */
.page-about .about-rail {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-rail__heading {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--rock-deep);
  margin: 0;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  background: rgba(18, 48, 79, .5);
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--signal);
  background: rgba(255, 106, 43, .10);
  color: var(--paper);
}

.page-about .about-rail__num {
  font-size: 11px;
  color: var(--signal);
  letter-spacing: .08em;
}

.page-about .about-rail__note {
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-dim);
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .about-rail__note a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 224, 176, .35);
  transition: border-color var(--dur) var(--ease);
}

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

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 24px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .about-chapter + .about-chapter {
  padding-top: clamp(36px, 5vw, 62px);
  border-top: 1px solid var(--line);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 22px;
}

.page-about .about-chapter__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 44px);
  line-height: .9;
  letter-spacing: .04em;
  color: rgba(255, 106, 43, .78);
}

.page-about .about-chapter__title {
  font-family: var(--font-head);
  font-size: clamp(21px, 3.2vw, 30px);
  line-height: 1.28;
  color: var(--paper);
  margin: 0;
  letter-spacing: .01em;
}

.page-about .about-chapter__body {
  max-width: 66ch;
}

.page-about .about-chapter__body p {
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0 0 18px;
}

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

.page-about .about-chapter__body a {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 224, 176, .32);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
  border: 1px solid var(--line);
  background: var(--board);
}

.page-about .about-figure--narrow {
  max-width: 620px;
}

.page-about .about-figure__media {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.62) brightness(.88) contrast(1.04);
}

.page-about .about-figure__cap {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-dim);
  border-top: 1px solid var(--line);
}

/* ---------- 团队关系 ---------- */
.page-about .about-team {
  margin: 30px 0 26px;
}

.page-about .about-team__hub {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid rgba(255, 106, 43, .45);
  background: rgba(255, 106, 43, .07);
  font-size: 13px;
  color: var(--paper);
  margin: 0 0 22px;
}

.page-about .about-team__hub .mono {
  font-size: 18px;
  color: var(--signal);
}

.page-about .about-team__nodes {
  display: grid;
  gap: 12px;
}

.page-about .about-team__node {
  position: relative;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(27, 62, 99, .52), rgba(18, 48, 79, .34));
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-team__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--line-strong);
  transition: background var(--dur) var(--ease);
}

.page-about .about-team__node:hover,
.page-about .about-team__node[open] {
  border-color: var(--line-strong);
}

.page-about .about-team__node[open]::before {
  background: var(--signal);
}

.page-about .about-team__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-team__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-team__name {
  font-family: var(--font-head);
  font-size: 17px;
  color: var(--paper);
  letter-spacing: .02em;
}

.page-about .about-team__flag {
  font-size: 12px;
  color: var(--rock-deep);
  letter-spacing: .18em;
  transition: color var(--dur) var(--ease);
}

.page-about .about-team__node[open] .about-team__flag,
.page-about .about-team__node:hover .about-team__flag {
  color: var(--mint);
}

.page-about .about-team__desc {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-dim);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

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

.page-about .about-steps__item {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 1px solid var(--line);
}

.page-about .about-steps__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--night);
  border: 1px solid var(--signal);
  transition: background var(--dur) var(--ease);
}

.page-about .about-steps__item:hover::before {
  background: var(--signal);
}

.page-about .about-steps__num {
  display: block;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .about-steps__title {
  font-family: var(--font-head);
  font-size: 16.5px;
  line-height: 1.45;
  color: var(--paper);
  margin: 0 0 6px;
}

.page-about .about-steps__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-dim);
  max-width: 52ch;
}

/* ---------- 标签行 ---------- */
.page-about .about-tagrow {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 6px 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .about-tagrow .tag {
  padding: 8px 14px;
  font-size: 13px;
  letter-spacing: .04em;
}

/* ---------- 合作方 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__item {
  position: relative;
  padding: 20px 18px 18px;
  border: 1px solid var(--line);
  background: rgba(18, 48, 79, .42);
  border-top-width: 2px;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-partners__item--moss { border-top-color: var(--moss); }
.page-about .about-partners__item--clay { border-top-color: var(--clay); }
.page-about .about-partners__item--mint { border-top-color: var(--mint); }

.page-about .about-partners__item:hover {
  background: rgba(27, 62, 99, .62);
}

.page-about .about-partners__name {
  font-family: var(--font-head);
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
  margin: 0 0 8px;
}

.page-about .about-partners__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ---------- 触达数据 ---------- */
.page-about .about-reach {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 26px 0;
}

.page-about .about-reach__cell {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  padding: 18px 16px;
  background: rgba(10, 26, 47, .78);
}

.page-about .about-reach__value {
  font-size: clamp(26px, 4vw, 34px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: .01em;
}

.page-about .about-reach__unit {
  font-size: 13px;
  color: var(--gold);
  opacity: .8;
}

.page-about .about-reach__label {
  flex: 1 1 100%;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-dim);
  margin-top: 4px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__scroll {
  margin: 30px 0 0;
  padding-bottom: 8px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 48, 79, .58), rgba(10, 26, 47, .7));
}

.page-about .about-timeline {
  display: block;
  width: 100%;
  min-width: 720px;
  height: auto;
}

.page-about .about-timeline__axis {
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .about-timeline__stem--clay { stroke: var(--clay); stroke-width: 1; }
.page-about .about-timeline__stem--mint { stroke: var(--mint); stroke-width: 1; }

.page-about .about-timeline__dot {
  fill: var(--night);
  stroke-width: 2;
}

.page-about .about-timeline__dot--clay { stroke: var(--clay); }
.page-about .about-timeline__dot--mint { stroke: var(--mint); }

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 22px;
  fill: var(--gold);
  letter-spacing: .04em;
}

.page-about .about-timeline__label {
  font-family: var(--font-head);
  font-size: 15px;
  fill: var(--paper);
}

.page-about .about-timeline__note {
  font-family: var(--font-body);
  font-size: 13px;
  fill: rgba(242, 237, 228, .56);
}

/* ---------- 桌面端 ---------- */
@media (min-width: 640px) {
  .page-about .about-reach {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-team__nodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr .85fr;
    align-items: end;
    gap: 56px;
  }

  .page-about .about-hero__stats {
    padding-bottom: 6px;
  }

  .page-about .about-shell {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: 60px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

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

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

  .page-about .about-rail__link {
    display: grid;
    grid-template-columns: 26px minmax(0, 1fr);
    gap: 10px;
    width: 100%;
    padding: 11px 0 11px 14px;
    border: 0;
    border-left: 1px solid var(--line);
    background: transparent;
    white-space: normal;
    font-size: 14px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--signal);
    background: linear-gradient(90deg, rgba(255, 106, 43, .12), transparent 78%);
  }

  .page-about .about-chapter__head {
    gap: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-steps__item::before,
  .page-about .about-team__node,
  .page-about .about-team__flag,
  .page-about .about-partners__item,
  .page-about .crumbs a,
  .page-about .about-chapter__body a {
    transition: none !important;
  }
}
</final>