.page-about {
  --about-ink: #263640;
  --about-ink-soft: rgba(38, 54, 64, 0.74);
  --about-on-dark: rgba(255, 255, 255, 0.76);
  --about-rule: rgba(6, 26, 43, 0.1);
  --about-rule-dark: rgba(255, 255, 255, 0.13);
  --about-pad: clamp(56px, 8vw, 104px);
  overflow-x: hidden;
  background: var(--deep-abyss);
  color: var(--white);
  font-family: var(--font-body);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: clamp(28px, 4vw, 44px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.52);
}
.page-about .about-crumbs a {
  color: var(--ice-cyan);
  text-decoration: none;
  transition: color 0.28s var(--ease);
}
.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--white);
}
.page-about .about-crumbs span[aria-current="page"] {
  color: rgba(255, 255, 255, 0.82);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(104px, 14vh, 168px) 0 clamp(52px, 7vw, 84px);
  background:
    radial-gradient(1000px 620px at 78% -18%, rgba(22, 217, 208, 0.2), transparent 62%),
    radial-gradient(760px 520px at 2% 106%, rgba(255, 107, 74, 0.12), transparent 70%),
    linear-gradient(180deg, #061a2b 0%, #08243a 100%);
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 40%;
  right: -12%;
  bottom: -34%;
  height: 420px;
  background: repeating-radial-gradient(circle at 50% 100%, rgba(22, 217, 208, 0.09) 0 1px, transparent 1px 30px);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(30px, 5vw, 52px);
  align-items: end;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--sand);
}
.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 6vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--white);
}
.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--about-on-dark);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--hairline-warm);
  box-shadow: 0 40px 80px -50px rgba(0, 0, 0, 0.85);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 首屏数据条 ---------- */
.page-about .about-facts {
  display: grid;
  gap: 1px;
  margin: clamp(38px, 5vw, 60px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--hairline-warm);
}
.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 22px;
}
.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ice-cyan);
}
.page-about .about-facts__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.58);
}

/* ---------- 通用分区 ---------- */
.page-about .about-section {
  padding: var(--about-pad) 0;
}
.page-about .about-section--light {
  background: var(--mist);
  color: var(--about-ink);
}
.page-about .about-section--deep {
  background: linear-gradient(180deg, #061a2b 0%, #0b2f45 100%);
  color: var(--white);
}
.page-about .about-section--cta {
  background:
    radial-gradient(900px 460px at 88% 0%, rgba(255, 107, 74, 0.16), transparent 68%),
    linear-gradient(160deg, #061a2b 0%, #0b2f45 55%, #125873 100%);
  color: var(--white);
}

.page-about .about-row {
  display: grid;
  gap: 22px;
}

/* ---------- 章节序号栏 ---------- */
.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.page-about .about-rail::after {
  content: "";
  width: 40px;
  height: 1px;
  margin-top: 4px;
  background: linear-gradient(90deg, var(--sand), transparent);
}
.page-about .about-no {
  font-family: var(--font-mono);
  font-size: clamp(38px, 5vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(22, 217, 208, 0.6);
}
.page-about .about-section--light .about-no {
  -webkit-text-stroke-color: rgba(18, 88, 115, 0.42);
}
.page-about .about-rail__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}
.page-about .about-section--light .about-rail__label {
  color: var(--ocean-600);
}

/* ---------- 正文 ---------- */
.page-about .about-row__body {
  min-width: 0;
  color: var(--about-ink);
}
.page-about .about-section--deep .about-row__body,
.page-about .about-section--cta .about-row__body {
  color: var(--about-on-dark);
}
.page-about .about-row__body h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: inherit;
}
.page-about .about-row__body p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.85;
  color: inherit;
}
.page-about .about-row__body p:last-child {
  margin-bottom: 0;
}
.page-about .about-row__body strong {
  font-weight: 700;
  color: var(--ocean-600);
}
.page-about .about-section--deep .about-row__body strong {
  color: var(--ice-cyan);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  --tl-line-x: 16px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-tl__item {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  grid-template-areas:
    "dot year"
    "dot body";
  column-gap: 16px;
  row-gap: 8px;
  padding-bottom: 34px;
}
.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: var(--tl-line-x);
  top: 26px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(22, 217, 208, 0.45), rgba(217, 192, 140, 0.15));
}
.page-about .about-tl__item:last-child {
  padding-bottom: 0;
}
.page-about .about-tl__item:last-child::before {
  display: none;
}
.page-about .about-tl__dot {
  grid-area: dot;
  justify-self: center;
  align-self: start;
  width: 12px;
  height: 12px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(22, 217, 208, 0.14);
}
.page-about .about-tl__year {
  grid-area: year;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cyan);
}
.page-about .about-tl__body {
  grid-area: body;
}
.page-about .about-tl__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--white);
}
.page-about .about-tl__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-on-dark);
}

.page-about .about-tl__figure {
  margin: clamp(34px, 5vw, 52px) 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--hairline);
}
.page-about .about-tl__figure img,
.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}
.page-about .about-team__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 22px 26px;
  background: var(--white);
  border: 1px solid rgba(6, 26, 43, 0.09);
  border-radius: 14px;
  transition: transform 0.32s var(--ease), border-color 0.32s var(--ease), box-shadow 0.32s var(--ease);
}
.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(22, 217, 208, 0.55);
  box-shadow: 0 24px 46px -32px rgba(6, 26, 43, 0.6);
}
.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--ocean-800);
}
.page-about .about-team__num small {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  color: rgba(38, 54, 64, 0.58);
}
.page-about .about-team__card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--deep-abyss);
}
.page-about .about-team__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.page-about .about-team__figure {
  margin: 30px 0 26px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--about-rule);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-reach {
  display: grid;
  gap: 28px;
  margin-top: 8px;
}
.page-about .about-reach__copy p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--about-on-dark);
}
.page-about .about-reach__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
}
.page-about .about-stat {
  padding: 18px 0 18px 18px;
  border-left: 1px solid var(--hairline-warm);
}
.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(36px, 5.4vw, 58px);
  font-weight: 700;
  line-height: 1;
  color: var(--ice-cyan);
}
.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- 版本研究折叠组 ---------- */
.page-about .about-expand {
  margin-top: 22px;
  border-bottom: 1px solid var(--about-rule);
}
.page-about .about-expand:first-of-type {
  border-top: 1px solid var(--about-rule);
}
.page-about .about-expand .expand__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 4px;
  background: none;
  border: 0;
  text-align: left;
  font-family: var(--font-body);
  font-size: 16.5px;
  font-weight: 600;
  color: var(--deep-abyss);
  cursor: pointer;
  transition: color 0.28s var(--ease);
}
.page-about .about-expand .expand__trigger:hover {
  color: var(--ocean-600);
}
.page-about .about-expand .expand__trigger:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
.page-about .about-expand__kicker {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--coral);
}
.page-about .about-expand__title {
  flex: 1 1 auto;
}
.page-about .about-expand .expand__inner p {
  margin: 0 0 18px;
  padding-left: 4px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* ---------- 承诺收尾 ---------- */
.page-about .about-promise {
  display: grid;
  gap: 32px;
}
.page-about .about-promise__kicker {
  display: inline-block;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--sand);
}
.page-about .about-promise__copy h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4.4vw, 54px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--white);
}
.page-about .about-promise__copy p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--about-on-dark);
}
.page-about .about-promise__copy a {
  color: var(--ice-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(142, 244, 236, 0.45);
  transition: border-color 0.28s var(--ease), color 0.28s var(--ease);
}
.page-about .about-promise__copy a:hover {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-about .about-promise__panel {
  padding: 26px 24px 28px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  backdrop-filter: blur(6px);
}
.page-about .about-promise__line {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--white);
  word-break: break-word;
}
.page-about .about-promise__line span {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.5);
}
.page-about .about-promise__note {
  margin: 0 0 22px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.62);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-facts li + li {
    padding-left: 28px;
    border-left: 1px solid var(--hairline);
  }
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(40px, 5vw, 72px);
  }
  .page-about .about-row {
    grid-template-columns: minmax(0, 190px) minmax(0, 1fr);
    column-gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }
  .page-about .about-tl {
    --tl-line-x: 177px;
    margin-top: 40px;
  }
  .page-about .about-tl__item {
    grid-template-columns: 160px 34px minmax(0, 1fr);
    grid-template-areas: "year dot body";
    column-gap: 0;
    padding-bottom: 44px;
  }
  .page-about .about-tl__year {
    text-align: right;
    padding-right: 26px;
    font-size: clamp(24px, 2.4vw, 32px);
    line-height: 1.15;
  }
  .page-about .about-tl__body {
    padding-left: 26px;
  }
  .page-about .about-reach {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(36px, 5vw, 64px);
    align-items: center;
  }
  .page-about .about-promise {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(40px, 6vw, 80px);
    align-items: center;
  }
}

@media (min-width: 1200px) {
  .page-about .about-row {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card {
    transition: none;
  }
  .page-about .about-team__card:hover,
  .page-about .about-team__card:focus-within {
    transform: none;
  }
}
<<<END>>>