.page-about {
  --about-gap: clamp(20px, 3vw, 56px);
  --about-index-w: 236px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}
.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
  filter: saturate(0.62) contrast(1.05);
}
.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(130% 95% at 8% 0%, rgba(53, 242, 200, 0.16), transparent 62%),
    linear-gradient(180deg, rgba(7, 26, 22, 0.58) 0%, rgba(7, 26, 22, 0.9) 68%, var(--ink-900) 100%);
}
.page-about .about-hero__inner {
  position: relative;
  padding-top: clamp(26px, 5.5vw, 68px);
  padding-bottom: clamp(34px, 6.5vw, 86px);
}
.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 44px);
}
.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}
.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.6vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--white);
  max-width: 17ch;
}
.page-about .about-hero__hl {
  color: var(--cyan);
}
.page-about .about-hero__lede {
  margin: 0 0 clamp(26px, 4vw, 44px);
  max-width: 56ch;
  font-size: var(--fz-body);
  line-height: 1.8;
  color: var(--mist);
}
.page-about .about-hero__meta {
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}
.page-about .about-hero__meta li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}
.page-about .about-hero__meta-k {
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.1em;
  color: var(--mist);
}
.page-about .about-hero__meta-v {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--white);
}
@media (min-width: 760px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 主体两栏 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-top: clamp(28px, 4.6vw, 62px);
  padding-bottom: clamp(48px, 8vw, 120px);
}

/* ---------- 左侧目录 ---------- */
.page-about .about-index {
  position: relative;
  margin-bottom: 30px;
}
.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.16em;
  color: var(--mist);
  text-transform: uppercase;
}
.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}
.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 9px 14px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  color: var(--line);
  letter-spacing: 0.08em;
}
.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--white);
  border-color: var(--cyan);
}
.page-about .about-index__link.is-active {
  color: var(--white);
  border-color: var(--cyan);
  background: var(--ink-700);
}
.page-about .about-index__link.is-active .about-index__num {
  color: var(--cyan);
}

@media (min-width: 960px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
    padding-right: 24px;
    border-right: 1px solid var(--line-soft);
  }
  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-index__link {
    width: 100%;
    padding: 10px 12px 10px 14px;
    border: 1px solid transparent;
    background: transparent;
  }
  .page-about .about-index__link.is-active {
    border-color: var(--line);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  min-width: 0;
}
.page-about .about-sec {
  border-top: 1px solid var(--line-soft);
  padding: clamp(28px, 4vw, 46px) 0 clamp(34px, 5vw, 58px);
  scroll-margin-top: 100px;
}
.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(14px, 2vw, 22px);
}
.page-about .about-sec__num {
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.14em;
  color: var(--amber);
  flex: 0 0 auto;
}
.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 36px);
  letter-spacing: -0.01em;
  color: var(--white);
}
.page-about .about-sec p {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: var(--fz-body);
  line-height: 1.78;
  color: var(--mist);
}
.page-about .about-sec p:last-child {
  margin-bottom: 0;
}
.page-about .about-lead {
  font-size: clamp(18px, 1.7vw, 22px);
  font-weight: 600;
  line-height: 1.65;
  color: var(--white);
  max-width: 48ch;
  margin-bottom: 18px;
}

/* ---------- 指标条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 24px 0 0;
  padding: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-about .about-stats__item {
  margin: 0;
  padding: 16px 16px 18px;
  background: var(--ink-800);
}
.page-about .about-stats dt {
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.08em;
  color: var(--mist);
  margin-bottom: 10px;
}
.page-about .about-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.1;
  color: var(--cyan);
}
@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 22px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-about .about-team__col {
  background: var(--ink-800);
  padding: 22px 20px 26px;
  transition: background 0.3s var(--ease);
}
.page-about .about-team__col:hover,
.page-about .about-team__col:focus-within {
  background: var(--ink-700);
}
.page-about .about-team__col:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -3px;
}
.page-about .about-team__idx {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.page-about .about-team__name {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
  max-width: none;
}
.page-about .about-team__duty {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  max-width: none;
}
@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 里程碑 ---------- */
.page-about .milestone {
  margin: 26px 0 4px;
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(180deg, rgba(36, 27, 74, 0.55), rgba(7, 26, 22, 0) 78%),
    var(--ink-800);
}
.page-about .milestone__rail {
  display: flex;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 22px 20px 24px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x mandatory;
}
.page-about .milestone__node {
  position: relative;
  flex: 0 0 auto;
  min-width: 196px;
  padding: 34px 22px 0 0;
  scroll-snap-align: start;
}
.page-about .milestone__node::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--indigo), var(--violet));
}
.page-about .milestone__node::after {
  content: "";
  position: absolute;
  top: 7px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink-800);
  border: 2px solid var(--violet);
}
.page-about .milestone__node--now::before {
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}
.page-about .milestone__node--now::after {
  border-color: var(--cyan);
  background: var(--cyan);
}
.page-about .milestone__year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  letter-spacing: 0.04em;
  color: var(--white);
  margin-bottom: 8px;
}
.page-about .milestone__node--now .milestone__year {
  color: var(--cyan);
}
.page-about .milestone__label {
  display: block;
  font-size: 14px;
  line-height: 1.68;
  color: var(--mist);
  max-width: 22ch;
}

/* ---------- 插图 ---------- */
.page-about .about-fig {
  margin: 24px 0 6px;
}
.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 4vw, 48px);
  padding: clamp(26px, 3.6vw, 44px) clamp(20px, 3vw, 40px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  background:
    radial-gradient(110% 120% at 100% 0%, rgba(255, 171, 61, 0.12), transparent 62%),
    var(--ink-800);
}
.page-about .about-cta__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: var(--fz-index);
  letter-spacing: 0.16em;
  color: var(--amber);
}
.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 30px);
  color: var(--white);
}
.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 60ch;
  font-size: var(--fz-body);
  line-height: 1.78;
  color: var(--mist);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-cta__actions .btn {
  text-decoration: none;
}
</main>