.page-about {
  --about-rail-w: 224px;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  margin-top: 104px;
  margin-bottom: 6px;
  font-size: var(--step--1);
  color: var(--mist);
}
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .crumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.page-about .crumbs li + li::before {
  content: "/";
  color: var(--rock);
}
.page-about .crumbs a {
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease);
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--teal);
}
.page-about .crumbs [aria-current="page"] {
  color: var(--cream);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(48px, 7vw, 88px);
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -8%;
  right: -6%;
  width: min(66vw, 720px);
  height: 118%;
  background:
    linear-gradient(140deg,
      rgba(53, 224, 200, .16) 0%,
      rgba(53, 224, 200, .04) 34%,
      rgba(255, 138, 61, .13) 68%,
      rgba(217, 69, 155, .07) 100%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 60px);
  align-items: center;
  min-width: 0;
}
.page-about .about-hero__copy {
  min-width: 0;
}
.page-about .about-hero__copy .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 16px;
}
.page-about .about-hero__copy h1 {
  font-size: var(--step-4);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -.012em;
  color: var(--cream);
  margin: 0 0 20px;
  max-width: 18ch;
}
.page-about .about-hero__copy .lede {
  font-size: var(--step-1);
  line-height: 1.75;
  color: var(--mist);
  max-width: 44ch;
  margin: 0;
}
.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  position: relative;
  background: var(--ink-2);
}
.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(53, 224, 200, .08), transparent 46%, rgba(255, 138, 61, .07));
  pointer-events: none;
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 主双栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(64px, 9vw, 120px);
  min-width: 0;
}

/* ---------- 版本轴 ---------- */
.page-about .version-rail {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
  min-width: 0;
}
.page-about .version-rail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 0;
}
.page-about .version-rail__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.page-about .version-rail__list::-webkit-scrollbar {
  display: none;
}
.page-about .version-node {
  flex: 0 0 auto;
}
.page-about .version-node a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  background: rgba(20, 42, 84, .5);
  color: var(--mist);
  text-decoration: none;
  font-size: var(--step--1);
  white-space: nowrap;
  transition: border-color .2s var(--ease), color .2s var(--ease), background-color .2s var(--ease);
}
.page-about .version-node a:hover,
.page-about .version-node a:focus-visible {
  border-color: var(--teal);
  color: var(--cream);
  background: rgba(53, 224, 200, .1);
}
.page-about .version-node__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  flex: 0 0 auto;
}
.page-about .version-node__num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--cream);
  letter-spacing: .02em;
}
.page-about .version-node__name {
  color: inherit;
}
.page-about .version-node:nth-child(2) .version-node__dot {
  background: var(--amber);
}
.page-about .version-node:nth-child(3) .version-node__dot {
  background: var(--magenta);
}

/* ---------- 内容流 ---------- */
.page-about .about-stream {
  display: grid;
  gap: clamp(52px, 7vw, 92px);
  min-width: 0;
}
.page-about .about-block {
  position: relative;
  min-width: 0;
}
.page-about .about-block + .about-block {
  padding-top: clamp(44px, 6vw, 76px);
  border-top: 1px solid var(--line-faint);
}
.page-about .about-block .eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 14px;
}
.page-about .about-block h2 {
  font-size: var(--step-3);
  line-height: 1.16;
  font-weight: 700;
  letter-spacing: -.008em;
  color: var(--cream);
  margin: 0 0 20px;
  max-width: 22ch;
}
.page-about .about-block p {
  font-size: var(--step-0);
  line-height: 1.78;
  color: var(--mist);
  margin: 0 0 16px;
  max-width: 64ch;
}
.page-about .about-block p:last-child {
  margin-bottom: 0;
}

/* ---------- 定位数据 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: var(--ink);
}
.page-about .about-stat__value {
  font-family: var(--font-mono);
  font-size: var(--step-2);
  font-weight: 700;
  line-height: 1;
  color: var(--teal);
  letter-spacing: -.01em;
}
.page-about .about-stat:nth-child(2) .about-stat__value {
  color: var(--amber);
}
.page-about .about-stat:nth-child(3) .about-stat__value {
  color: var(--cream);
}
.page-about .about-stat__key {
  font-size: var(--step--1);
  color: var(--mist);
  line-height: 1.5;
}

/* ---------- 图形 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 26px 0 30px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
}
.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(53, 224, 200, .07), transparent 52%, rgba(255, 138, 61, .06));
  pointer-events: none;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 演进列表 ---------- */
.page-about .evolution-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .evolution-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-soft);
  scroll-margin-top: 120px;
}
.page-about .evolution-item__marker {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.page-about .evolution-item__num {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--teal);
}
.page-about .evolution-item:nth-child(2) .evolution-item__num {
  color: var(--amber);
}
.page-about .evolution-item:nth-child(3) .evolution-item__num {
  color: var(--magenta);
}
.page-about .evolution-item__label {
  font-size: var(--step--1);
  letter-spacing: .08em;
  color: var(--mist);
}
.page-about .evolution-item__body h3 {
  font-size: var(--step-2);
  font-weight: 700;
  line-height: 1.28;
  color: var(--cream);
  margin: 0 0 10px;
}
.page-about .evolution-item__body p {
  margin: 0;
  font-size: var(--step-0);
  line-height: 1.78;
  color: var(--mist);
  max-width: 58ch;
}

/* ---------- 运营卡片 ---------- */
.page-about .ops-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}
.page-about .ops-card {
  position: relative;
  padding: 22px 20px;
  background: var(--ink-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .ops-card::before {
  content: "";
  display: block;
  width: 30px;
  height: 3px;
  border-radius: 2px;
  margin-bottom: 16px;
  background: var(--teal);
}
.page-about .ops-card--amber::before {
  background: var(--amber);
}
.page-about .ops-card--moss::before {
  background: var(--moss);
}
.page-about .ops-card--magenta::before {
  background: var(--magenta);
}
.page-about .ops-card__title {
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.3;
  color: var(--cream);
  margin: 0 0 10px !important;
  max-width: none;
}
.page-about .ops-card__text {
  margin: 0 !important;
  font-size: var(--step--1);
  line-height: 1.76;
  color: var(--mist);
  max-width: none;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .team-card {
  padding: 22px 20px;
  background: linear-gradient(180deg, var(--ink-2), var(--ink));
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius);
}
.page-about .team-card--amber {
  border-left-color: var(--amber);
}
.page-about .team-card--moss {
  border-left-color: var(--moss);
}
.page-about .team-card__name {
  font-size: var(--step-1);
  font-weight: 700;
  color: var(--cream);
  margin: 0 0 8px;
}
.page-about .team-card__desc {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.72;
  color: var(--mist);
}

.page-about .partners {
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--line-soft);
}
.page-about .partners__lede {
  font-size: var(--step-0);
  color: var(--cream);
  line-height: 1.72;
  max-width: 56ch;
  margin: 0 0 18px;
}
.page-about .partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.page-about .partners__list li {
  position: relative;
  padding-left: 22px;
  font-size: var(--step-0);
  line-height: 1.65;
  color: var(--mist);
}
.page-about .partners__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  opacity: .85;
}

/* ---------- 规模 ---------- */
.page-about .scale-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 6px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .scale-metric {
  background: var(--ink);
  padding: 20px 18px;
}
.page-about .scale-metric__value {
  font-family: var(--font-mono);
  font-size: var(--step-2);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--teal);
  margin: 0 0 8px;
}
.page-about .scale-metric--amber .scale-metric__value {
  color: var(--amber);
}
.page-about .scale-metric--cream .scale-metric__value {
  color: var(--cream);
}
.page-about .scale-metric--moss .scale-metric__value {
  color: var(--moss);
}
.page-about .scale-metric__key {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 内联链接与备案 ---------- */
.page-about .about-inline-link {
  margin-top: 24px !important;
  font-size: var(--step-0);
  line-height: 1.75;
  color: var(--mist);
}
.page-about .about-inline-link a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 200, .45);
  padding-bottom: 1px;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-inline-link a:hover,
.page-about .about-inline-link a:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cream);
}
.page-about .about-legal-note {
  margin-top: 34px !important;
  padding-top: 18px;
  border-top: 1px solid var(--line-faint);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 平板：>= 680px ---------- */
@media (min-width: 680px) {
  .page-about .ops-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .partners__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 32px;
  }
  .page-about .evolution-item {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 32px;
    padding: 30px 0;
  }
  .page-about .evolution-item__marker {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
  .page-about .scale-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 桌面：>= 900px ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: clamp(32px, 5vw, 68px);
  }
  .page-about .about-hero__copy h1 {
    font-size: var(--step-5);
  }
}

/* ---------- 宽屏：版本轴转为纵向粘性 ---------- */
@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(48px, 5.5vw, 88px);
    align-items: start;
  }
  .page-about .version-rail {
    position: sticky;
    top: 118px;
    align-self: start;
    padding-bottom: 0;
    border-bottom: 0;
    gap: 18px;
  }
  .page-about .version-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    position: relative;
  }
  .page-about .version-rail__list::before {
    content: "";
    position: absolute;
    left: 6px;
    top: 14px;
    bottom: 14px;
    width: 1px;
    background: linear-gradient(to bottom, var(--teal) 0%, var(--amber) 52%, var(--magenta) 100%);
    opacity: .5;
  }
  .page-about .version-node + .version-node {
    margin-top: 22px;
  }
  .page-about .version-node a {
    display: grid;
    grid-template-columns: 13px minmax(0, 1fr);
    grid-template-rows: auto auto;
    column-gap: 14px;
    row-gap: 2px;
    align-items: center;
    padding: 4px 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    white-space: normal;
  }
  .page-about .version-node a:hover,
  .page-about .version-node a:focus-visible {
    background: transparent;
    border-color: transparent;
  }
  .page-about .version-node__dot {
    grid-row: 1 / span 2;
    width: 13px;
    height: 13px;
    background: var(--ink);
    border: 2px solid var(--teal);
    position: relative;
    z-index: 1;
    transition: background-color .2s var(--ease), box-shadow .2s var(--ease);
  }
  .page-about .version-node__num {
    font-size: var(--step-0);
    color: var(--cream);
    grid-column: 2;
  }
  .page-about .version-node__name {
    grid-column: 2;
    font-size: var(--step--1);
    color: var(--mist);
  }
  .page-about .version-node:nth-child(2) .version-node__dot {
    border-color: var(--amber);
    background: var(--ink);
  }
  .page-about .version-node:nth-child(3) .version-node__dot {
    border-color: var(--magenta);
    background: var(--ink);
  }
  .page-about .version-node a:hover .version-node__num,
  .page-about .version-node a:focus-visible .version-node__num {
    color: var(--teal);
  }
  .page-about .version-node a:hover .version-node__dot,
  .page-about .version-node a:focus-visible .version-node__dot {
    background: var(--teal);
    box-shadow: 0 0 12px rgba(53, 224, 200, .55);
  }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .version-node a,
  .page-about .version-node__dot,
  .page-about .crumbs a,
  .page-about .about-inline-link a {
    transition: none;
  }
}
</main>