.page-about {
  --about-gap: clamp(22px, 3.4vw, 44px);
  --about-soft: rgba(19, 26, 58, .72);
  color: var(--ink);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(32px, 6vw, 84px) 0 clamp(34px, 5.5vw, 68px);
  background:
    radial-gradient(115% 85% at 88% 4%, rgba(108, 77, 246, .30), transparent 60%),
    radial-gradient(85% 70% at 2% 96%, rgba(34, 211, 238, .12), transparent 62%),
    var(--void);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -14%;
  width: min(48vw, 580px);
  height: min(48vw, 580px);
  background: linear-gradient(150deg, rgba(108, 77, 246, .40), rgba(34, 211, 238, .07) 72%);
  clip-path: polygon(28% 0%, 100% 14%, 74% 100%, 0 82%);
  pointer-events: none;
}

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

.page-about .about-hero__eyebrow {
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 15ch;
  font-family: var(--font-display);
  font-size: clamp(34px, 7.2vw, 82px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 42ch;
  color: var(--ink-soft);
}

/* 关键事实条 */
.page-about .about-facts {
  list-style: none;
  margin: clamp(26px, 4vw, 48px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-fact {
  display: grid;
  gap: 8px;
  padding: 16px 16px 18px;
  background: rgba(11, 16, 36, .86);
}

.page-about .about-fact__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ink-dim);
}

.page-about .about-fact__v {
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: .02em;
}

.page-about .about-fact__v .num {
  color: var(--gold);
}

/* ============ 沿革时间轴 ============ */
.page-about .about-road__head {
  max-width: 64ch;
}

.page-about .about-road__intro {
  margin-top: 14px;
  color: var(--ink-soft);
}

.page-about .about-road__figure {
  margin: clamp(24px, 4vw, 42px) 0 clamp(30px, 5vw, 56px);
}

.page-about .about-timeline {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 4px 0 4px 24px;
  display: grid;
  gap: clamp(26px, 4.6vw, 54px);
  border-left: 1px solid var(--line);
}

.page-about .stage {
  position: relative;
}

.page-about .stage::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -32px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--violet);
  background: var(--void);
}

.page-about .stage:nth-child(even)::before {
  border-color: var(--cyan);
}

.page-about .stage__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .stage__title {
  margin: 8px 0 10px;
  font-size: clamp(20px, 3.2vw, 30px);
  line-height: 1.3;
  letter-spacing: .01em;
}

.page-about .stage__text {
  margin: 0;
  max-width: 42ch;
  color: var(--ink-soft);
  line-height: 1.78;
}

.page-about .stage__text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .stage__more {
  margin: 10px 0 0;
  max-width: 40ch;
  color: var(--ink-dim);
  font-size: 15px;
  line-height: 1.72;
}

/* ============ 团队与分工 ============ */
.page-about .about-team__head {
  max-width: 66ch;
}

.page-about .about-team__head .prose {
  margin-top: 14px;
  color: var(--ink-soft);
}

.page-about .about-team__grid {
  margin-top: clamp(24px, 4vw, 42px);
  align-items: start;
}

.page-about .team-card {
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(19, 26, 58, .94), rgba(11, 16, 36, .9));
  transition: transform .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .team-card + .team-card {
  margin-top: 14px;
}

.page-about .team-card--content {
  box-shadow: inset 3px 0 0 var(--violet);
}

.page-about .team-card--release {
  box-shadow: inset 3px 0 0 var(--cyan);
}

.page-about .team-card--support {
  box-shadow: inset 3px 0 0 var(--gold);
}

.page-about .team-card--content:hover,
.page-about .team-card--content:focus-within {
  box-shadow: inset 3px 0 0 var(--violet), var(--shadow);
  border-color: var(--violet);
  transform: translateY(-4px);
}

.page-about .team-card--release:hover,
.page-about .team-card--release:focus-within {
  box-shadow: inset 3px 0 0 var(--cyan), var(--shadow);
  border-color: var(--cyan);
  transform: translateY(-4px);
}

.page-about .team-card--support:hover,
.page-about .team-card--support:focus-within {
  box-shadow: inset 3px 0 0 var(--gold), var(--shadow);
  border-color: var(--gold);
  transform: translateY(-4px);
}

.page-about .team-card__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .team-card__name {
  margin: 0;
  font-size: 19px;
  letter-spacing: .01em;
}

.page-about .team-card__size {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-about .team-card__text {
  margin: 10px 0 0;
  color: var(--ink-soft);
  line-height: 1.75;
}

.page-about .about-team__media {
  margin-top: 18px;
}

.page-about .about-diagram__scroll {
  margin-top: clamp(28px, 4.4vw, 48px);
  overflow-x: auto;
  padding-bottom: 8px;
}

.page-about .about-diagram {
  display: block;
  width: 100%;
  min-width: 640px;
  height: auto;
}

.page-about .dg-box {
  fill: rgba(11, 16, 36, .92);
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .dg-box--violet {
  stroke: var(--violet);
}

.page-about .dg-box--cyan {
  stroke: var(--cyan);
}

.page-about .dg-box--gold {
  stroke: var(--gold);
}

.page-about .dg-line {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .dg-bus {
  fill: none;
  stroke: var(--violet);
  stroke-width: 1.5;
  stroke-dasharray: 5 7;
}

.page-about .dg-target {
  fill: rgba(108, 77, 246, .16);
  stroke: var(--violet);
  stroke-width: 1.5;
}

.page-about .dg-label {
  fill: var(--ink);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .02em;
}

.page-about .dg-sub {
  fill: var(--ink-dim);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}

/* ============ 记录流程 ============ */
.page-about .about-flow__head {
  max-width: 62ch;
}

.page-about .about-flow__head .prose {
  margin-top: 14px;
  color: var(--ink-soft);
}

.page-about .flow {
  list-style: none;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2.4vw, 24px);
}

.page-about .flow__step {
  position: relative;
  padding: 22px 18px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--about-soft);
  overflow: hidden;
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  width: 42px;
  height: 2px;
  background: linear-gradient(90deg, var(--violet), transparent);
}

.page-about .flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  letter-spacing: .06em;
  color: var(--gold);
}

.page-about .flow__name {
  margin: 12px 0 8px;
  font-size: 18px;
  letter-spacing: .01em;
}

.page-about .flow__text {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.72;
}

.page-about .about-flow__note {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  max-width: 46ch;
  color: var(--ink-dim);
  line-height: 1.75;
}

.page-about .about-flow__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============ 栏目共建 ============ */
.page-about .about-partners__grid {
  align-items: center;
}

.page-about .about-partners__figure {
  margin: 0;
}

.page-about .about-partners__body .h2 {
  margin-top: 12px;
}

.page-about .about-partners__body .prose {
  margin-top: 14px;
  color: var(--ink-soft);
}

.page-about .about-partners__list {
  list-style: none;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-partners__list li {
  padding: 14px 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  line-height: 1.72;
}

.page-about .about-partners__list li:last-child {
  border-bottom: 1px solid var(--line);
}

/* ============ 运营规模 ============ */
.page-about .about-scale__head {
  max-width: 60ch;
}

.page-about .about-scale__head .prose {
  margin-top: 14px;
  color: var(--ink-soft);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(24px, 3.8vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 26px);
}

.page-about .about-stat {
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-about .about-stat__v {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 28px);
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .about-stat__k {
  display: block;
  margin-top: 6px;
  color: var(--ink-dim);
  font-size: 14px;
  line-height: 1.6;
}

.page-about .about-scale__note {
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  max-width: 58ch;
  color: var(--ink-soft);
  line-height: 1.78;
}

.page-about .about-scale__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============ 收束 ============ */
.page-about .about-principles .h2 {
  margin-top: 12px;
}

.page-about .principles {
  list-style: none;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
}

.page-about .principles li {
  padding: 15px 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  line-height: 1.78;
}

.page-about .principles li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .principles strong {
  color: var(--ink);
  font-weight: 700;
}

.page-about .about-principles__cta {
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  color: var(--ink-soft);
  line-height: 1.8;
}

.page-about .about-principles__cta a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ============ 响应式 ============ */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team__media {
    margin-top: 0;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-timeline {
    padding-left: 42px;
  }

  .page-about .stage::before {
    left: -50px;
    top: 8px;
  }

  .page-about .stage:nth-child(1) {
    width: 62%;
  }

  .page-about .stage:nth-child(2) {
    width: 48%;
    margin-left: 20%;
  }

  .page-about .stage:nth-child(3) {
    width: 56%;
    margin-left: 34%;
  }

  .page-about .stage:nth-child(4) {
    width: 50%;
    margin-left: 8%;
  }
}

@media (min-width: 1080px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .stage__more {
    margin-top: 0;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .38s var(--ease), opacity .3s var(--ease), margin-top .3s var(--ease);
  }

  .page-about .stage:hover .stage__more,
  .page-about .stage:focus-within .stage__more {
    margin-top: 10px;
    max-height: 260px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .stage__more {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}