.page-about {
  --about-node: 12px;
  --about-rail-w: 2px;
  --about-card-bg: linear-gradient(180deg, rgba(16, 38, 61, .72), rgba(11, 27, 43, .72));
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(22px, 5vw, 46px);
  padding-bottom: clamp(32px, 6.5vw, 76px);
  background:
    radial-gradient(circle at 86% 8%, rgba(41, 242, 194, .10), transparent 46%),
    radial-gradient(circle at 6% 92%, rgba(255, 162, 58, .07), transparent 42%),
    linear-gradient(180deg, var(--ink-2), var(--ink) 74%);
  border-bottom: 1px solid var(--line-2);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 auto;
  width: min(46vw, 520px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan-a16));
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  margin-top: clamp(20px, 3.2vw, 34px);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  max-width: 20ch;
}

.page-about .about-hero__lead .lede {
  max-width: 62ch;
}

.page-about .about-hero__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .about-facts {
  margin: 0;
  padding: 0;
}

.page-about .about-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-2);
}

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

.page-about .about-facts dt {
  margin: 0;
  font-size: 13px;
  letter-spacing: .03em;
  color: var(--mist);
}

.page-about .about-facts dd {
  margin: 0;
  color: var(--cold);
  font-weight: 600;
  font-size: 15px;
  white-space: nowrap;
}

.page-about .about-facts dd.mono-num {
  color: var(--white);
}

/* ---------- 通用列表 ---------- */
.page-about .about-list {
  list-style: none;
  counter-reset: about-li;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-list li {
  position: relative;
  padding: 0 0 0 24px;
  margin-bottom: 11px;
  color: var(--mist);
  line-height: 1.75;
}

.page-about .about-list li:last-child {
  margin-bottom: 0;
}

.page-about .about-list li::before {
  counter-increment: about-li;
  content: counter(about-li, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 4px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cyan);
}

.page-about .about-list--plain li::before {
  counter-increment: none;
  content: "";
  top: 12px;
  left: 2px;
  width: 10px;
  height: 2px;
  border-radius: 1px;
  background: var(--amber);
}

.page-about .about-list--dense li {
  padding-left: 22px;
  margin-bottom: 13px;
  color: var(--mist);
}

.page-about .about-list--dense li::before {
  top: 5px;
}

.page-about .about-list strong {
  color: var(--cold);
  font-weight: 600;
}

/* ---------- 起源 ---------- */
.page-about .about-origin {
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 42px);
}

.page-about .about-origin__main p {
  color: var(--mist);
  line-height: 1.85;
  margin: 0 0 14px;
}

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

.page-about .about-origin__main .section__title {
  margin-bottom: 18px;
}

.page-about .about-origin__side {
  border-left: 1px solid var(--line-2);
  padding: 4px 0 4px 20px;
}

.page-about .about-origin__side-title {
  margin: 0;
  font-size: 13px;
  letter-spacing: .07em;
  color: var(--amber);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: linear-gradient(180deg, var(--ink), var(--ink-3));
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-timeline__media {
  margin: 0 0 clamp(26px, 4vw, 46px);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-track {
  list-style: none;
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: var(--about-rail-w);
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 78%);
  opacity: .85;
}

.page-about .about-track__item {
  position: relative;
  padding-bottom: clamp(24px, 3.6vw, 36px);
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: var(--about-node);
  height: var(--about-node);
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(41, 242, 194, .10);
}

.page-about .about-track__item:last-child::before {
  border-color: var(--amber);
  box-shadow: 0 0 0 4px var(--amber-a12);
}

.page-about .about-track__ver {
  display: block;
  font-size: clamp(26px, 4.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--cyan);
}

.page-about .about-track__item:last-child .about-track__ver {
  color: var(--amber);
}

.page-about .about-track__title {
  margin: 10px 0 8px;
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.4vw, 20px);
  font-weight: 600;
  color: var(--cold);
}

.page-about .about-track__body p {
  margin: 0;
  color: var(--mist);
  line-height: 1.8;
  max-width: 56ch;
}

/* ---------- 术语 ---------- */
.page-about .about-glossary {
  border-top: 1px solid var(--line-2);
  padding-top: 18px;
}

.page-about .about-glossary__title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .10em;
  color: var(--mist);
}

.page-about .about-term {
  border-bottom: 1px solid var(--line-2);
  padding: 11px 0;
}

.page-about .about-term:first-of-type {
  border-top: 1px solid var(--line-2);
}

.page-about .about-term__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  list-style: none;
  cursor: pointer;
  color: var(--cold);
  font-size: 15px;
  font-weight: 600;
  transition: color var(--t-fast) var(--ease);
}

.page-about .about-term__sum::-webkit-details-marker {
  display: none;
}

.page-about .about-term__sum:hover {
  color: var(--cyan);
}

.page-about .about-term__sum::after {
  content: "+";
  flex: none;
  font-family: var(--font-num);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-term[open] .about-term__sum::after {
  content: "−";
  color: var(--amber);
}

.page-about .about-term__body {
  margin: 9px 0 2px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.8;
}

/* ---------- 数据口径 ---------- */
.page-about .about-caliber {
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-caliber__grid {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
}

.page-about .about-caliber__text .section__title {
  margin-bottom: 16px;
}

.page-about .about-caliber__text > p {
  color: var(--mist);
  line-height: 1.85;
  margin: 0;
}

.page-about .about-caliber__media {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: linear-gradient(180deg, var(--ink-2), var(--ink));
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-team__grid {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .about-team__col {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
  background: var(--about-card-bg);
  box-shadow: var(--shadow-soft);
  transition: border-color var(--t) var(--ease);
}

.page-about .about-team__col:hover {
  border-color: var(--cyan-a16);
}

.page-about .about-team__num {
  display: block;
  margin: 0;
  font-size: 15px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .about-team__name {
  margin: 8px 0 10px;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--cold);
}

.page-about .about-team__col p:last-child {
  margin: 0;
  color: var(--mist);
  line-height: 1.78;
  font-size: 14.5px;
}

.page-about .about-team__media {
  margin: 0;
}

/* ---------- 合作与边界 ---------- */
.page-about .about-eco {
  border-bottom: 1px solid var(--line-2);
}

.page-about .about-eco__grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 42px);
}

.page-about .about-eco__text .section__title {
  margin-bottom: 16px;
}

.page-about .about-eco__text p {
  color: var(--mist);
  line-height: 1.85;
  margin: 0 0 14px;
}

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

.page-about .about-eco__aside {
  align-self: start;
}

/* ---------- 延伸阅读 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-next__card {
  display: block;
  padding: 20px 18px 18px;
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
  background: var(--about-card-bg);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-soft);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--cyan-a16);
  transform: translateY(-2px);
}

.page-about .about-next__k {
  margin: 0;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}

.page-about .about-next__t {
  margin: 8px 0 8px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--cold);
}

.page-about .about-next__d {
  margin: 0 0 14px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.75;
}

.page-about .about-next__go {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--amber);
  border-bottom: 1px solid var(--amber-deep);
  padding-bottom: 2px;
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .9fr);
    align-items: start;
  }

  .page-about .about-caliber__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .9fr);
    align-items: start;
  }

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

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, .9fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, .82fr);
    align-items: start;
  }

  .page-about .about-glossary {
    position: sticky;
    top: 32px;
  }

  .page-about .about-hero__title {
    max-width: 17ch;
  }
}

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

  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}
<<<END>>>