.page-about {
  --about-gap: 28px;
  --about-pad: 24px;
  padding-bottom: 96px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 96px;
  padding-bottom: 56px;
}

.page-about .breadcrumb {
  margin-bottom: 32px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: end;
}

.page-about .about-hero__lead h1 {
  font-size: clamp(2rem, 6.4vw, 4rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--silver);
  margin: 12px 0 20px;
  max-width: 18em;
}

.page-about .about-hero__lede {
  color: var(--body-text);
  font-size: 16px;
  line-height: 1.85;
  max-width: 40em;
}

.page-about .about-hero__stat-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-stat__value {
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-stat__label {
  font-size: 13px;
  color: var(--mute);
  letter-spacing: 0.04em;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 14px;
  background: var(--paper);
  color: #2a2f3c;
  font-size: 12px;
  letter-spacing: 0.12em;
  font-family: var(--font-mono);
}

/* ---------- 起源 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-origin__text h2,
.page-about .section-head h2,
.page-about .about-team h2,
.page-about .about-cta h2 {
  font-size: clamp(1.65rem, 3.6vw, 2.4rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--silver);
  margin: 10px 0 18px;
}

.page-about .about-origin__text p {
  color: var(--body-text);
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 18px;
}

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

.page-about .about-origin__text a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-origin__aside {
  align-self: start;
  padding: 24px;
}

.page-about .about-fact {
  margin: 16px 0 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 16px;
}

.page-about .about-fact dt {
  font-size: 13px;
  color: var(--rock);
  letter-spacing: 0.04em;
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 14px;
  color: var(--silver);
  line-height: 1.6;
}

/* ---------- 原则 ---------- */
.page-about .about-principles__intro,
.page-about .about-team__intro,
.page-about .about-history__intro,
.page-about .about-partners__intro,
.page-about .about-metrics__intro {
  color: var(--body-text);
  font-size: 15.5px;
  line-height: 1.8;
  max-width: 44em;
  margin-top: 12px;
}

.page-about .principle-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 40px;
}

.page-about .principle {
  position: relative;
  padding: 26px 22px 24px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .principle:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .principle__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--clay);
  margin-bottom: 12px;
}

.page-about .principle h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--silver);
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}

.page-about .principle p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
  margin: 0;
}

.page-about .principle a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(86, 200, 222, 0.35);
  transition: border-color var(--dur) var(--ease);
}

.page-about .principle a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 36px;
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

.page-about .team-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .team-card {
  padding: 22px;
  border-left: 2px solid var(--line);
  background: linear-gradient(90deg, rgba(13, 23, 48, 0.9), rgba(6, 10, 22, 0.4));
  transition: border-color var(--dur) var(--ease);
}

.page-about .team-card:hover {
  border-left-color: var(--cyan);
}

.page-about .team-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.page-about .team-card__metric {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .team-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--silver);
  margin: 0 0 8px;
}

.page-about .team-card p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--body-text);
  margin: 0;
}

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

.page-about .team-card a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__figure {
  margin: 36px 0 0;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-2);
}

.page-about .about-history__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  opacity: 0.6;
}

.page-about .about-timeline {
  position: relative;
  margin: 44px 0 0;
  padding-left: 26px;
  list-style: none;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px 0;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--cyan);
  border-color: var(--cyan);
  transform: scale(1.35);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--clay);
  margin: 0 0 6px;
}

.page-about .about-timeline__item h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--silver);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.page-about .about-timeline__item p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--body-text);
  margin: 0;
  max-width: 42em;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 36px;
}

.page-about .partner-card {
  padding: 26px 22px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .partner-card:hover {
  transform: translateY(-2px);
  border-color: var(--star);
}

.page-about .partner-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--silver);
  margin: 16px 0 10px;
  letter-spacing: -0.01em;
}

.page-about .partner-card p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--body-text);
  margin: 0;
}

.page-about .partner-flow {
  margin-top: 40px;
  padding: 28px 22px;
  border: 1px dashed var(--line);
  background: rgba(13, 23, 48, 0.45);
}

.page-about .about-partners__flowlabel {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--rock);
  margin: 0 0 18px;
}

.page-about .partner-flow .step-path {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  counter-reset: step;
}

.page-about .partner-flow .step {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--body-text);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .partner-flow .step:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .partner-flow .step__num {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  flex-shrink: 0;
}

/* ---------- 指标 ---------- */
.page-about .metric-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 40px;
}

.page-about .metric {
  padding: 24px 22px;
  border-top: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(27, 42, 82, 0.35), rgba(6, 10, 22, 0));
  transition: border-color var(--dur) var(--ease);
}

.page-about .metric:hover {
  border-top-color: var(--amber);
}

.page-about .metric__value {
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.4vw, 2.3rem);
  letter-spacing: 0.01em;
  color: var(--silver);
  margin: 0 0 6px;
  line-height: 1.1;
}

.page-about .metric__label {
  font-size: 14.5px;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .metric__note {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mute);
  margin: 0;
}

.page-about .about-metrics__closing {
  margin-top: 32px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--body-text);
}

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

.page-about .about-metrics__closing a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta__panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 32px 24px;
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(86, 200, 222, 0.14), rgba(6, 10, 22, 0) 60%),
    var(--ink-2);
}

.page-about .about-cta__text p {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--body-text);
  margin: 0 0 24px;
  max-width: 40em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__trust {
  padding: 24px;
  align-self: start;
}

.page-about .about-cta__trust p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--body-text);
  margin: 14px 0 0;
}

.page-about .about-cta__meta {
  margin-top: 18px !important;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stat-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

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

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

  .page-about .partner-flow .step {
    border-bottom: none;
    padding-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-gap: 48px;
  }

  .page-about .about-hero {
    padding-top: 128px;
    padding-bottom: 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-origin__aside {
    margin-top: 28px;
  }

  .page-about .principle-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px 28px;
  }

  .page-about .principle--offset {
    transform: translateY(26px);
  }

  .page-about .principle--offset:hover {
    transform: translateY(24px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-timeline {
    padding-left: 40px;
    margin-top: 52px;
  }

  .page-about .about-timeline__item::before {
    left: -47px;
    top: 8px;
    width: 11px;
    height: 11px;
  }

  .page-about .about-timeline__item {
    padding-bottom: 44px;
  }

  .page-about .partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    align-items: start;
  }

  .page-about .partner-card--offset {
    transform: translateY(30px);
  }

  .page-about .partner-card--offset:hover {
    transform: translateY(28px);
  }

  .page-about .partner-flow .step-path {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-metrics__closing {
    max-width: 42em;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 48px;
    padding: 48px 44px;
  }
}

@media (min-width: 1100px) {
  .page-about .metric-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .metric--offset {
    transform: translateY(22px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle,
  .page-about .partner-card,
  .page-about .about-timeline__item::before,
  .page-about .metric {
    transition: none;
  }

  .page-about .principle--offset,
  .page-about .partner-card--offset,
  .page-about .metric--offset {
    transform: none;
  }
}
</main>