.page-about {
  --about-band: clamp(56px, 8vw, 104px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: flex-end;
  min-height: min(78vh, 760px);
  padding: clamp(96px, 15vh, 168px) 0 clamp(40px, 5vw, 68px);
  overflow: hidden;
  background: var(--ink-900);
}

.page-about .about-hero__figure {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 40%;
  filter: saturate(.86) contrast(1.06);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 18, 32, .78) 0%, rgba(14, 42, 34, .40) 36%, rgba(14, 42, 34, .95) 100%),
    radial-gradient(110% 70% at 80% 20%, rgba(78, 216, 192, .14), transparent 62%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(22px, 4vw, 42px);
}

.page-about .about-hero__crumb .breadcrumb__item {
  color: var(--fog);
  font-size: .82rem;
  letter-spacing: .06em;
}

.page-about .about-hero__crumb .breadcrumb__link {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .about-hero__crumb .breadcrumb__link:hover {
  text-decoration: underline;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 12px;
  color: var(--lime);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 20ch;
  color: var(--white);
  font-size: clamp(2rem, 6.2vw, 4.3rem);
  line-height: 1.03;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 46ch;
  color: rgba(244, 246, 242, .84);
  font-size: clamp(1rem, 1.5vw, 1.13rem);
  line-height: 1.8;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 目录索引 ---------- */
.page-about .about-index-band {
  background: var(--charcoal);
  border-block: 1px solid var(--line-soft);
}

.page-about .about-index {
  padding: 18px 0;
}

.page-about .about-index__list {
  display: flex;
  gap: clamp(16px, 3vw, 42px);
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding-bottom: 4px;
  color: var(--fog);
  text-decoration: none;
  font-size: .88rem;
  letter-spacing: .04em;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--lime);
}

.page-about .about-index__num {
  font-size: .72rem;
  color: var(--lime);
}

/* ---------- 区块基础 ---------- */
.page-about .about-block {
  padding-block: var(--about-band);
}

.page-about .about-block + .about-block {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-block__head .eyebrow,
.page-about .about-block__headline .eyebrow,
.page-about .about-team__text .eyebrow,
.page-about .about-fork__item .eyebrow {
  margin: 0 0 12px;
  color: var(--lime);
}

.page-about .about-block__head .h-sub,
.page-about .about-block__headline .h-sub,
.page-about .about-team__text .h-sub {
  margin: 0;
  color: var(--white);
}

.page-about .about-block__headline {
  margin-bottom: clamp(26px, 3.6vw, 44px);
}

.page-about .about-block__body p {
  margin: 0 0 18px;
  max-width: 38em;
  color: rgba(244, 246, 242, .82);
  line-height: 1.85;
}

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

.page-about .about-block__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(78, 216, 192, .42);
}

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

.page-about .about-lead {
  color: var(--white) !important;
  font-size: clamp(1.05rem, 1.7vw, 1.2rem);
}

.page-about .about-block__body .about-lead {
  color: var(--white);
  font-size: clamp(1.05rem, 1.7vw, 1.2rem);
}

/* ---------- 两条动线 ---------- */
.page-about .about-fork {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-fork__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(24px, 3.2vw, 40px) clamp(22px, 3vw, 36px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(30, 74, 58, .58), rgba(18, 22, 26, .62));
}

.page-about .about-fork__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius) var(--radius) 0 0;
}

.page-about .about-fork__item--new::before {
  background: var(--lime);
}

.page-about .about-fork__item--back::before {
  background: var(--cyan);
}

.page-about .about-fork__title {
  margin: 0;
  color: var(--white);
  font-size: clamp(1.18rem, 2.2vw, 1.5rem);
  line-height: 1.2;
}

.page-about .about-fork__item p {
  margin: 0;
  color: rgba(244, 246, 242, .8);
  line-height: 1.8;
  font-size: .95rem;
}

.page-about .about-fork__link {
  margin-top: auto;
  align-self: flex-start;
  color: var(--cyan);
  text-decoration: none;
  font-size: .92rem;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  align-items: center;
}

.page-about .about-team__text h2 {
  margin: 0 0 20px;
}

.page-about .about-team__text p {
  margin: 0 0 16px;
  color: rgba(244, 246, 242, .82);
  line-height: 1.85;
}

.page-about .about-team__list {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__list li {
  display: grid;
  grid-template-columns: 14px 1fr;
  gap: 12px;
  align-items: start;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  color: rgba(244, 246, 242, .82);
  font-size: .94rem;
  line-height: 1.7;
}

.page-about .about-team__list li::before {
  content: "";
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border-radius: 2px;
  background: var(--lime);
  opacity: .9;
}

.page-about .about-team__visual {
  margin-top: clamp(28px, 4vw, 0px);
}

.page-about .about-team__visual .figure {
  margin: 0;
}

.page-about .about-team__visual .figure__media {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 20px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline__hint {
  margin: 0;
  color: var(--fog);
  font-size: .82rem;
  letter-spacing: .08em;
}

.page-about .timeline {
  display: flex;
  gap: clamp(16px, 2.4vw, 28px);
  margin: 0;
  padding: 0 0 10px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline__node {
  position: relative;
  flex: 0 0 min(76vw, 252px);
  scroll-snap-align: start;
  padding: 28px 0 0;
  border-top: 1px solid var(--line);
  transition: border-color .25s ease;
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--fog);
  transition: background .25s ease, box-shadow .25s ease;
}

.page-about .timeline__year {
  margin: 0 0 6px;
  color: var(--fog);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1;
  transition: color .25s ease;
}

.page-about .timeline__title {
  margin: 0 0 8px;
  color: var(--white);
  font-size: 1rem;
  letter-spacing: .04em;
}

.page-about .timeline__text {
  margin: 0;
  color: rgba(244, 246, 242, .74);
  font-size: .9rem;
  line-height: 1.75;
}

.page-about .timeline__detail {
  margin: 10px 0 0;
  padding-left: 12px;
  border-left: 2px solid rgba(78, 216, 192, .42);
  color: var(--cyan);
  font-size: .84rem;
  line-height: 1.7;
}

.page-about .about-timeline__figure {
  margin: clamp(32px, 5vw, 56px) 0 0 auto;
  max-width: 520px;
}

.page-about .about-timeline__figure .figure__media {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

/* ---------- 数据旁注 ---------- */
.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .stat-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--charcoal);
}

.page-about .stat-card__num {
  color: var(--lime);
  font-size: clamp(2rem, 4.6vw, 2.9rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .stat-card__label {
  color: var(--white);
  font-size: .92rem;
  letter-spacing: .04em;
}

.page-about .stat-card__note {
  margin: 4px 0 0;
  color: var(--fog);
  font-size: .82rem;
  line-height: 1.7;
}

.page-about .about-scale__foot {
  margin: clamp(24px, 3vw, 34px) 0 0;
  color: var(--fog);
  font-size: .92rem;
  line-height: 1.8;
}

.page-about .about-scale__foot a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(78, 216, 192, .42);
}

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

/* ---------- 合作 ---------- */
.page-about .partner-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 联系路径 ---------- */
.page-about .service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .service-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(18, 22, 26, .58);
  transition: transform .2s ease, border-color .2s ease;
}

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

.page-about .service-card h3 {
  margin: 0;
  color: var(--white);
  font-size: 1.06rem;
  letter-spacing: .04em;
}

.page-about .service-card p {
  margin: 0;
  color: rgba(244, 246, 242, .78);
  font-size: .92rem;
  line-height: 1.75;
}

.page-about .service-card .service-card__channel {
  margin-top: auto;
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: .86rem;
  word-break: break-all;
}

.page-about .service-card__link {
  margin-top: auto;
  align-self: flex-start;
  color: var(--cyan);
  text-decoration: none;
  font-size: .92rem;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}

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

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-block: clamp(40px, 6vw, 72px);
  border-top: 1px solid var(--line);
}

.page-about .about-closing p {
  margin: 0;
  max-width: 34em;
  color: var(--white);
  font-size: clamp(1.02rem, 1.9vw, 1.26rem);
  line-height: 1.7;
}

/* ---------- 悬停展开（仅精细指针） ---------- */
@media (hover: hover) and (pointer: fine) {
  .page-about .timeline__detail {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .35s ease, opacity .28s ease, margin-top .3s ease;
  }

  .page-about .timeline__node:hover .timeline__detail,
  .page-about .timeline__node:focus-within .timeline__detail {
    max-height: 180px;
    margin-top: 10px;
    opacity: 1;
  }

  .page-about .timeline__node:hover {
    border-top-color: var(--lime);
  }

  .page-about .timeline__node:hover .timeline__year,
  .page-about .timeline__node:focus-within .timeline__year {
    color: var(--lime);
  }

  .page-about .timeline__node:hover::before,
  .page-about .timeline__node:focus-within::before {
    background: var(--lime);
    box-shadow: 0 0 0 6px rgba(200, 240, 74, .12);
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .service-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about .about-fork {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 981px) {
  .page-about .about-team__visual {
    margin-top: 0;
  }

  .page-about .about-timeline__figure {
    margin-top: clamp(32px, 5vw, 56px);
  }
}

@media (max-width: 860px) {
  .page-about .about-hero {
    min-height: 62vh;
    padding-top: clamp(84px, 14vh, 130px);
  }

  .page-about .about-hero__title {
    max-width: 100%;
  }

  .page-about .about-hero__figure img {
    object-position: center 46%;
  }
}

@media (max-width: 640px) {
  .page-about .about-block__headline {
    margin-bottom: 22px;
  }

  .page-about .timeline__node {
    flex: 0 0 min(84vw, 250px);
  }

  .page-about .stat-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  }

  .page-about .about-closing {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .about-closing .btn {
    width: 100%;
    text-align: center;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-fork__link,
  .page-about .service-card,
  .page-about .service-card__link,
  .page-about .timeline__node,
  .page-about .timeline__node::before,
  .page-about .timeline__year {
    transition: none;
  }

  .page-about .service-card:hover {
    transform: none;
  }
}