.page-about {
  --about-text: #C9D5D0;
  --about-rail: 176px;
  background: var(--c-ink);
  color: var(--c-paper);
  padding: 24px 0 72px;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 8px 0 52px;
  border-bottom: 1px solid var(--c-line);
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -220px;
  right: -140px;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle at 50% 50%, rgba(53, 240, 208, 0.14), transparent 68%);
  pointer-events: none;
}
.page-about .about-hero__eyebrow {
  margin: 22px 0 0;
}
.page-about .about-hero__title {
  position: relative;
  margin: 14px 0 0;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(34px, 7vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.015em;
  max-width: 16em;
}
.page-about .about-hero__lede {
  position: relative;
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-text);
}
.page-about .about-hero__meta {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 36px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--c-line);
}
.page-about .about-hero__meta-item dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-mist);
}
.page-about .about-hero__meta-item dd {
  margin: 6px 0 0;
  font-size: 15px;
  color: var(--c-paper);
}
.page-about .about-hero__meta-item dd::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 2px;
  margin-right: 8px;
  vertical-align: 3px;
  background: var(--c-cyan);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding-top: 12px;
}
.page-about .about-index {
  margin: 20px 0 4px;
}
.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-mist);
}
.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 10px;
  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: 8px 12px;
  border: 1px solid var(--c-line);
  color: var(--c-mist);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}
.page-about .about-index__num {
  font-size: 11px;
  color: var(--c-amber);
}
.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
  background: rgba(53, 240, 208, 0.07);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding: 44px 0;
  border-top: 1px solid var(--c-line);
  overflow: hidden;
}
.page-about .about-flow > .about-sec:first-child {
  border-top: 0;
  padding-top: 24px;
}
.page-about .about-sec__wm {
  position: absolute;
  top: 0;
  right: -8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(72px, 15vw, 148px);
  line-height: 1;
  color: var(--c-cyan);
  opacity: 0.08;
  pointer-events: none;
  user-select: none;
}
.page-about .about-sec__head {
  position: relative;
  margin-bottom: 24px;
}
.page-about .about-sec__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-mist);
}
.page-about .about-sec__kicker::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--c-cyan);
}
.page-about .about-sec__title {
  margin: 12px 0 0;
  max-width: 20em;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}
.page-about .about-text {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--about-text);
}
.page-about .about-text:last-child {
  margin-bottom: 0;
}
.page-about .about-lead {
  font-size: 17px;
  line-height: 2;
  color: var(--c-paper);
}

/* ---------- 01 使用场景 ---------- */
.page-about .about-who {
  margin-top: 28px;
}
.page-about .about-who__row {
  display: grid;
  gap: 10px;
  padding: 24px 0;
  border-top: 1px solid var(--c-line);
  transition: border-color 160ms var(--ease);
}
.page-about .about-who__row:hover {
  border-top-color: var(--c-cyan);
}
.page-about .about-who__role {
  margin: 0;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.3;
  color: var(--c-paper);
}
.page-about .about-who__tag {
  margin: 8px 0 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-amber);
}
.page-about .about-who__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--about-text);
}

/* ---------- 02 演进 ---------- */
.page-about .about-gen {
  display: grid;
  gap: 28px;
}
.page-about .about-gen__note {
  margin: 4px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-amber);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--c-amber);
}
.page-about .about-gen__figure {
  margin: 0;
}
.page-about .about-tl {
  display: flex;
  margin-top: 34px;
  padding: 16px 0 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
}
.page-about .about-tl__item {
  position: relative;
  flex: 0 0 76%;
  max-width: 300px;
  padding: 26px 20px 16px 0;
  border-top: 2px solid var(--c-line);
  scroll-snap-align: start;
  transition: border-color 160ms var(--ease);
}
.page-about .about-tl__dot {
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-panel);
  border: 2px solid var(--c-line);
  transition: background 160ms var(--ease), border-color 160ms var(--ease);
}
.page-about .about-tl__year {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-mist);
}
.page-about .about-tl__name {
  margin: 6px 0 8px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 19px;
  color: var(--c-paper);
}
.page-about .about-tl__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-text);
}
.page-about .about-tl__item:hover,
.page-about .about-tl__item:focus-within {
  border-top-color: var(--c-cyan);
}
.page-about .about-tl__item:hover .about-tl__dot {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}
.page-about .about-tl__item--current {
  border-top-color: var(--c-amber);
}
.page-about .about-tl__item--current .about-tl__dot {
  background: var(--c-amber);
  border-color: var(--c-amber);
  box-shadow: 0 0 0 4px rgba(242, 179, 61, 0.16);
}
.page-about .about-tl__item--current .about-tl__name {
  color: var(--c-amber);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 30px;
}
.page-about .about-team__roles {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-team__role {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--c-line);
}
.page-about .about-team__count {
  font-size: 15px;
  color: var(--c-amber);
  padding-top: 2px;
}
.page-about .about-team__role-name {
  margin: 0 0 6px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--c-paper);
}
.page-about .about-team__role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
}
.page-about .about-team__note {
  margin-top: 22px;
  padding: 16px 18px;
  background: var(--c-layer);
  border-left: 2px solid var(--c-cyan);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--about-text);
}
.page-about .about-team__figure {
  margin: 0;
}

/* ---------- 04 流程 ---------- */
.page-about .about-flow {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-flow__step {
  position: relative;
  padding: 0 0 26px 44px;
}
.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 28px;
  bottom: 0;
  width: 1px;
  background: var(--c-line);
}
.page-about .about-flow__step:last-child::before {
  display: none;
}
.page-about .about-flow__num {
  position: absolute;
  left: 0;
  top: 0;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--c-cyan);
  color: var(--c-ink);
  font-size: 12px;
  font-weight: 700;
}
.page-about .about-flow__name {
  margin: 0 0 6px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 18px;
  color: var(--c-paper);
}
.page-about .about-flow__step p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-text);
}
.page-about .about-flow__foot {
  margin: 6px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--c-line);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--c-amber);
}

/* ---------- 05 合作 ---------- */
.page-about .about-eco {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-eco__tag {
  padding: 9px 15px;
  border: 1px solid var(--c-line);
  background: var(--c-panel);
  color: var(--about-text);
  line-height: 1.2;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}
.page-about .about-eco__tag--lg {
  font-size: 16px;
  font-family: var(--font-title);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-paper);
}
.page-about .about-eco__tag--md {
  font-size: 14.5px;
}
.page-about .about-eco__tag--sm {
  font-size: 13px;
  color: var(--c-mist);
}
.page-about .about-eco__tag:hover {
  background: rgba(53, 240, 208, 0.08);
  border-color: var(--c-cyan);
  color: var(--c-cyan);
}
.page-about .about-eco__more {
  margin: 24px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--about-text);
}

/* ---------- 06 覆盖 ---------- */
.page-about .about-reach {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-line);
  padding: 30px 22px;
}
.page-about .about-reach::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(11, 31, 26, 0.92) 20%, rgba(11, 31, 26, 0.72) 100%);
  pointer-events: none;
}
.page-about .about-reach__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}
.page-about .about-reach__inner {
  position: relative;
  z-index: 1;
}
.page-about .about-reach__text {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.95;
  color: var(--c-paper);
}
.page-about .about-reach__stats {
  display: grid;
  gap: 18px;
  margin: 26px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--c-line);
}
.page-about .about-reach__stat dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-mist);
}
.page-about .about-reach__stat dd {
  margin: 6px 0 0;
  font-size: clamp(24px, 5vw, 34px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-amber);
}

/* ---------- 07 联系 ---------- */
.page-about .about-sec--last {
  border-bottom: 1px solid var(--c-line);
}
.page-about .about-cta {
  padding: 26px 22px;
  background: var(--c-layer);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.page-about .about-cta__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.95;
  color: var(--about-text);
}
.page-about .about-cta__mail {
  color: var(--c-cyan);
  word-break: break-all;
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 0;
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 22px 0 0;
  padding: 18px 0 0;
  list-style: none;
  border-top: 1px solid var(--c-line);
  font-size: 14px;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__meta {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-reach__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
  .page-about .about-tl__item {
    flex: 0 0 240px;
    max-width: none;
  }
  .page-about .about-who__row {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }
  .page-about .about-reach {
    padding: 38px 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-gen {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
    gap: 44px;
    align-items: start;
  }
  .page-about .about-team__figure {
    margin-top: 48px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: 92px;
    margin: 44px 0 0;
  }
  .page-about .about-index__title {
    padding-left: 14px;
    margin-bottom: 12px;
  }
  .page-about .about-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-index__link {
    width: 100%;
    padding: 11px 0 11px 14px;
    border: 0;
    border-left: 1px solid var(--c-line);
    clip-path: none;
    white-space: normal;
    transition: color 160ms var(--ease), border-color 160ms var(--ease);
  }
  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: transparent;
    border-left-color: var(--c-cyan);
    border-left-width: 2px;
    padding-left: 13px;
  }
  .page-about .about-sec {
    padding: 56px 0;
  }
  .page-about .about-sec__head {
    margin-bottom: 30px;
  }
  .page-about .about-lead {
    font-size: 18px;
  }
  .page-about .about-cta {
    padding: 34px 32px;
  }
}
<<<END>>>