.page-about {
  display: block;
  background: var(--ink);
  color: var(--on-ink);
  overflow-x: clip;
}

.page-about .page-about__h2 {
  margin: 0 0 .55em;
  font-size: clamp(1.75rem, 5vw, 3.1rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 800;
  color: var(--graphite);
}

.page-about .page-about__h2--ink {
  color: var(--on-ink);
}

.page-about .page-about__head {
  max-width: 52ch;
}

/* ---------- 首屏 ---------- */
.page-about .page-about__hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(20px, 5vw, 64px));
  padding-bottom: clamp(44px, 7vw, 88px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(34, 211, 197, .14), transparent 58%),
    radial-gradient(80% 70% at 0% 100%, rgba(255, 90, 31, .16), transparent 62%),
    var(--ink);
}

.page-about .page-about__hero-grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .page-about__hero-title {
  margin: 0 0 .35em;
  font-size: clamp(2.6rem, 9.5vw, 6.2rem);
  line-height: .96;
  letter-spacing: -.03em;
  color: var(--on-ink);
}

.page-about .page-about__hero-lede {
  max-width: 46ch;
  margin: 0;
  color: var(--on-ink-dim);
}

.page-about .page-about__hero-frame {
  position: relative;
  margin: 0;
  background: linear-gradient(145deg, var(--tactical), var(--ink-deep));
  clip-path: polygon(0 0, 100% 0, 100% 78%, 82% 100%, 0 100%);
}

.page-about .page-about__hero-frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  max-width: 100%;
}

.page-about .page-about__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px clamp(16px, 3vw, 36px);
  margin: clamp(30px, 5vw, 56px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .page-about__facts li {
  padding-top: 14px;
  border-top: 2px solid var(--orange);
}

.page-about .page-about__fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.2vw, 2.1rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .page-about__fact-label {
  display: block;
  margin-top: 10px;
  font-size: .82rem;
  line-height: 1.5;
  letter-spacing: .03em;
  color: var(--on-ink-dim);
}

/* ---------- 起点 ---------- */
.page-about .page-about__origin {
  color: var(--graphite);
  padding-block: clamp(48px, 8vw, 104px);
}

.page-about .page-about__origin-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .page-about__origin-note {
  color: var(--gold);
  font-size: .76rem;
  letter-spacing: .16em;
}

.page-about .page-about__prose {
  color: var(--graphite);
}

.page-about .page-about__prose p {
  margin: 0 0 1.15em;
}

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

.page-about .page-about__origin-card {
  align-self: start;
  background: var(--paper);
  border-left: 3px solid var(--orange);
}

.page-about .page-about__origin-quote {
  margin: 0;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  line-height: 1.5;
  letter-spacing: -.01em;
  color: var(--ink);
}

/* ---------- 时间轴 ---------- */
.page-about .page-about__timeline {
  padding-block: clamp(48px, 8vw, 104px);
}

.page-about .page-about__axis-wrap {
  margin: clamp(30px, 5vw, 56px) 0 0;
  color: var(--gold);
}

.page-about .page-about__axis {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .page-about__axis .ax-bar {
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-opacity: .45;
}

.page-about .page-about__axis .ax-ticks line {
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-opacity: .85;
}

.page-about .page-about__tl {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .page-about__tl-node {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 26px) clamp(20px, 2.6vw, 28px);
  background: linear-gradient(158deg, rgba(27, 42, 91, .92), rgba(16, 26, 60, .72));
  border: 1px solid rgba(199, 208, 234, .16);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .page-about__tl-node::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  height: 34px;
  background: var(--gold);
  transition: height .28s var(--ease);
}

.page-about .page-about__tl-node:hover,
.page-about .page-about__tl-node:focus-within {
  transform: translateY(-4px);
  border-color: rgba(217, 164, 65, .5);
}

.page-about .page-about__tl-node:hover::before,
.page-about .page-about__tl-node:focus-within::before {
  height: 100%;
}

.page-about .page-about__tl-stage {
  margin: 0 0 10px;
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .page-about__tl-title {
  margin: 0 0 10px;
  font-size: 1.06rem;
  line-height: 1.45;
  font-weight: 700;
  color: var(--on-ink);
}

.page-about .page-about__tl-text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--on-ink-dim);
}

.page-about .page-about__axis-figure {
  margin: clamp(34px, 5vw, 60px) 0 0;
}

.page-about .page-about__axis-figure img {
  display: block;
  width: min(100%, 1000px);
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

/* ---------- 流程 ---------- */
.page-about .page-about__flow {
  color: var(--graphite);
  padding-block: clamp(48px, 8vw, 104px);
}

.page-about .page-about__flow-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .page-about__tabs .tabs__tab {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .05em;
}

.page-about .page-about__step-title {
  margin: 0 0 12px;
  font-size: clamp(1.1rem, 2.6vw, 1.42rem);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .page-about__step-text {
  margin: 0 0 16px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-about .page-about__step-out {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--edge);
  font-size: .8rem;
  letter-spacing: .02em;
  color: var(--orange-deep);
}

.page-about .page-about__flow-frame {
  position: relative;
  background: linear-gradient(150deg, var(--tactical), var(--ink));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .page-about__flow-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .page-about__team {
  padding-block: clamp(48px, 8vw, 104px);
}

.page-about .page-about__team-grid {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .page-about__team-card {
  background: rgba(16, 26, 60, .62);
  border-top: 3px solid var(--cyan);
}

.page-about .page-about__team-text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--on-ink-dim);
}

.page-about .page-about__team-note {
  margin: clamp(26px, 4vw, 40px) 0 0;
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--gold);
}

/* ---------- 合作 ---------- */
.page-about .page-about__partner {
  color: var(--graphite);
  padding-block: clamp(48px, 8vw, 104px);
}

.page-about .page-about__partner-cols {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .page-about__partner-heading {
  margin: 0 0 14px;
  font-size: .95rem;
  letter-spacing: .04em;
  color: var(--orange-deep);
}

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

.page-about .page-about__partner-list li {
  position: relative;
  padding: 10px 0 10px 20px;
  font-size: .92rem;
  line-height: 1.7;
  color: var(--graphite);
  border-bottom: 1px solid var(--edge);
}

.page-about .page-about__partner-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

.page-about .page-about__partner-foot {
  margin: clamp(20px, 3vw, 30px) 0 16px;
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 认可 ---------- */
.page-about .page-about__honor {
  padding-block: clamp(48px, 8vw, 104px);
}

.page-about .page-about__honor-grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .page-about__honor .tag {
  display: inline-block;
  margin-bottom: 18px;
}

.page-about .page-about__honor-text {
  margin: 0;
  max-width: 58ch;
  line-height: 1.8;
  color: var(--on-ink-dim);
}

.page-about .page-about__honor-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px 24px;
  align-self: start;
  padding-top: 22px;
  border-top: 2px solid var(--gold);
}

.page-about .page-about__honor-num {
  margin: 0;
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold);
}

.page-about .page-about__honor-label {
  margin: 8px 0 0;
  font-size: .82rem;
  letter-spacing: .04em;
  color: var(--on-ink-dim);
}

/* ---------- 归档入口 ---------- */
.page-about .page-about__archive {
  padding-block: clamp(50px, 8vw, 112px);
}

.page-about .page-about__archive-inner {
  max-width: 72ch;
}

.page-about .page-about__archive-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-about .page-about__rows {
  margin-top: clamp(30px, 4vw, 46px);
  border-top: 1px solid rgba(199, 208, 234, .22);
}

.page-about .page-about__rows .data-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 18px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(199, 208, 234, .14);
}

.page-about .page-about__rows .data-row__key {
  color: var(--on-ink-dim);
  font-size: .84rem;
  letter-spacing: .04em;
}

.page-about .page-about__rows .data-row__val {
  color: var(--on-ink);
  font-family: var(--font-mono);
  font-size: .84rem;
  letter-spacing: .03em;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .page-about__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 780px) {
  .page-about .page-about__team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .page-about__team-grid > :nth-child(2) {
    margin-top: 20px;
  }

  .page-about .page-about__team-grid > :nth-child(3) {
    margin-top: 8px;
  }
}

@media (min-width: 900px) {
  .page-about .page-about__hero-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: end;
  }

  .page-about .page-about__origin-grid {
    grid-template-columns: 58px minmax(0, 1.35fr) minmax(0, .8fr);
    gap: clamp(24px, 3.4vw, 56px);
    align-items: start;
  }

  .page-about .page-about__origin-note {
    writing-mode: vertical-rl;
    justify-self: start;
  }

  .page-about .page-about__honor-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .page-about__flow-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-about .page-about__tl {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .page-about__tl-node,
  .page-about .page-about__tl-node::before {
    transition: none;
  }

  .page-about .page-about__tl-node:hover,
  .page-about .page-about__tl-node:focus-within {
    transform: none;
  }
}