.page-about {
  --about-track: rgba(11, 44, 77, 0.22);
  --about-halo: var(--seagull);
  display: block;
  background: var(--seagull);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(152deg, var(--mineral) 0%, var(--seagull) 62%);
  border-bottom-left-radius: var(--radius-lg);
  border-bottom-right-radius: var(--radius-lg);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -46%;
  width: 72%;
  height: 82%;
  background: linear-gradient(118deg, rgba(11, 44, 77, 0.07), rgba(18, 227, 198, 0.16));
  transform: rotate(-7deg);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 36px;
  padding-block: clamp(28px, 6vw, 64px) clamp(44px, 8vw, 92px);
}

.page-about .about-hero__copy {
  min-width: 0;
}

.page-about .about-hero__eyebrow {
  margin: 20px 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--moss);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(2.1rem, 6.4vw, 4.4rem);
  font-weight: 250;
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--deep);
  max-width: 14em;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--rock);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-hero__facts b {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--deep);
  letter-spacing: -0.02em;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(11, 44, 77, 0.16);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding-block: clamp(52px, 9vw, 112px);
}

.page-about .about-section--dark {
  background: var(--night);
  color: var(--on-dark);
}

.page-about .about-section--dark .section-title,
.page-about .about-section--dark .section-eyebrow {
  color: var(--seagull);
}

.page-about .about-section--dark .section-eyebrow b {
  color: var(--cyan);
}

.page-about .about-section .section-head {
  margin-bottom: clamp(28px, 5vw, 52px);
}

.page-about .about-section .section-title {
  max-width: 20em;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-origin__text {
  min-width: 0;
  max-width: 62em;
}

.page-about .about-origin__text p {
  margin: 0 0 1.2em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}

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

.page-about .about-origin__figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--night);
}

.page-about .about-origin__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-origin__figure figcaption {
  padding: 14px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--on-dark-soft);
  background: var(--night);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: var(--mineral);
  --about-halo: var(--mineral);
}

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

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 0 14px;
  padding-bottom: 30px;
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 26px;
  top: 34px;
  bottom: 0;
  width: 1px;
  background-image: linear-gradient(to bottom, var(--about-track) 46%, transparent 46%);
  background-size: 1px 9px;
}

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

.page-about .timeline__item:last-child::after {
  content: none;
}

.page-about .timeline__gutter {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding-top: 4px;
}

.page-about .timeline__index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--clay);
}

.page-about .timeline__dot {
  display: block;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 5px var(--about-halo);
}

.page-about .timeline__content {
  min-width: 0;
}

.page-about .timeline__title {
  margin: 0 0 10px;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  font-weight: 600;
  line-height: 1.3;
  color: var(--deep);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--rock);
}

.page-about .timeline__more {
  margin-top: 12px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-about .timeline__more > summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--moss);
  padding: 2px 0;
}

.page-about .timeline__more > summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__more > summary::after {
  content: "+";
  font-size: 13px;
  line-height: 1;
  color: var(--violet);
}

.page-about .timeline__more[open] > summary::after {
  content: "–";
}

.page-about .timeline__more > summary:hover {
  color: var(--deep);
}

.page-about .timeline__more > summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.page-about .timeline__more p {
  margin: 10px 0 0;
  max-width: 44em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: 0 0 clamp(28px, 5vw, 48px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--night);
}

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

.page-about .about-team__figure figcaption {
  padding: 14px 20px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--on-dark-soft);
  background: var(--night);
}

.page-about .team__grid {
  display: grid;
  gap: 20px;
}

.page-about .team__card {
  background: var(--seagull);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px 22px 26px;
  transition: border-color var(--dur-fast) var(--ease), transform var(--dur) var(--ease);
}

.page-about .team__card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
}

.page-about .team__card--lead {
  background: linear-gradient(165deg, var(--deep) 0%, var(--night) 100%);
  border-color: transparent;
}

.page-about .team__card--lead .team__label {
  color: var(--cyan);
}

.page-about .team__card--lead .team__desc,
.page-about .team__card--lead .team__scale-note {
  color: var(--on-dark);
}

.page-about .team__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--moss);
}

.page-about .team__value {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--seagull);
  letter-spacing: -0.02em;
}

.page-about .team__value b {
  font-size: 48px;
  font-weight: 700;
}

.page-about .team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .team__scale {
  position: relative;
  height: 6px;
  margin: 20px 0 10px;
  border-radius: var(--radius-pill);
  background: rgba(246, 248, 249, 0.18);
  overflow: hidden;
}

.page-about .team__scale-fill {
  display: block;
  width: 34%;
  height: 100%;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

.page-about .team__scale-note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock);
}

/* ---------- 数据流程 ---------- */
.page-about .flow__list {
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: flow;
}

.page-about .flow__step {
  position: relative;
  padding: 24px 22px 26px;
  border-radius: var(--radius-md);
  background: rgba(246, 248, 249, 0.05);
  border: 1px solid var(--line-light);
}

.page-about .flow__num {
  display: inline-block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .flow__title {
  margin: 0 0 10px;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 600;
  line-height: 1.35;
  color: var(--seagull);
}

.page-about .flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-dark);
}

.page-about .flow__note {
  margin-top: 28px;
  padding: 22px 24px;
  border-left: 3px solid var(--coral);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(246, 248, 249, 0.06);
}

.page-about .flow__note p {
  margin: 0;
  max-width: 58em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--on-dark);
}

/* ---------- 伙伴 ---------- */
.page-about .partners__stats {
  display: grid;
  gap: 16px;
}

.page-about .partners__stat {
  padding: 22px 20px;
  border-radius: var(--radius-md);
  background: var(--mineral);
  border-left: 3px solid var(--moss);
}

.page-about .partners__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--deep);
}

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

.page-about .partners__body {
  margin-top: 30px;
  max-width: 64em;
}

.page-about .partners__body p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

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

.page-about .creds {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .creds__item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--mineral);
  border: 1px solid var(--line);
  font-size: 14px;
  color: var(--rock);
}

.page-about .creds__num {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--violet);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: linear-gradient(180deg, var(--seagull) 0%, var(--mineral) 100%);
}

.page-about .next__grid {
  display: grid;
  gap: 20px;
}

.page-about .next__card {
  padding: 26px 22px 28px;
  border-radius: var(--radius-md);
  background: var(--seagull);
  border: 1px solid var(--line);
  transition: transform var(--dur) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .next__card:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
}

.page-about .next__kicker {
  display: inline-block;
  margin: 0 0 14px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(122, 92, 255, 0.1);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--violet);
}

.page-about .next__title {
  margin: 0 0 12px;
  font-size: clamp(1.08rem, 2vw, 1.32rem);
  font-weight: 600;
  line-height: 1.35;
  color: var(--deep);
}

.page-about .next__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(26px, 4vw, 40px) clamp(22px, 4vw, 44px);
  border-radius: var(--radius-lg);
  background: linear-gradient(140deg, var(--deep) 0%, var(--night) 100%);
  color: var(--on-dark);
}

.page-about .about-cta__text {
  margin: 0 0 24px;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--on-dark);
}

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

.page-about .about-cta__actions .btn--ghost {
  color: var(--seagull);
  border-color: rgba(246, 248, 249, 0.34);
}

.page-about .about-cta__actions .btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .timeline__item {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 0 22px;
    padding-bottom: 38px;
  }

  .page-about .timeline__item::after {
    left: 35px;
    top: 38px;
  }

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

  .page-about .team__card--lead {
    grid-column: 1 / -1;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
    gap: 56px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
    gap: 48px;
  }

  .page-about .about-origin__figure {
    position: sticky;
    top: 120px;
  }

  .page-about .team__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-about .team__card--lead {
    grid-column: auto;
  }

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

  .page-about .timeline__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 0 32px;
    padding-bottom: 46px;
  }

  .page-about .timeline__item::after {
    left: 47px;
    top: 42px;
  }

  .page-about .timeline__index {
    font-size: 14px;
  }

  .page-about .timeline__dot {
    width: 13px;
    height: 13px;
  }
}

@media (min-width: 1440px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team__card,
  .page-about .next__card {
    transition: none;
  }

  .page-about .team__card:hover,
  .page-about .next__card:hover {
    transform: none;
  }
}