.page-about {
  --about-year-col: 180px;
}

.page-about > section {
  padding-block: clamp(40px, 6vw, 84px);
}

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

.page-about .about-head {
  max-width: 72ch;
  margin-bottom: clamp(26px, 3.6vw, 44px);
}

.page-about .about-head .h2 {
  margin: 10px 0 14px;
}

.page-about .about-head__lede {
  margin: 0;
  color: var(--cool);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-top: clamp(20px, 3vw, 36px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  max-width: 17ch;
  margin: 0 0 20px;
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 0;
  color: var(--cool);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fact {
  background: var(--ink-800);
  padding: 16px 18px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-fact dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.1;
}

.page-about .about-hero__media {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

/* ---------- 起点与取舍 ---------- */

.page-about .about-lead {
  align-items: start;
}

.page-about .about-lead__head .h2 {
  margin: 10px 0 0;
  max-width: 20ch;
}

.page-about .about-lead__body p {
  margin: 0;
}

.page-about .about-lead__body p + p {
  margin-top: 1.1em;
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  margin-top: clamp(12px, 2vw, 20px);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 30px 26px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .tl-item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 12px;
  height: 1px;
  background: var(--neon);
}

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

.page-about .tl-item:last-child::before {
  bottom: auto;
  height: 22px;
}

.page-about .tl-head {
  position: relative;
  display: grid;
  gap: 8px;
  padding-right: 34px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-head:focus-visible {
  outline: 1px solid var(--neon);
  outline-offset: 4px;
}

.page-about .tl-head::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-item[open] .tl-head::after {
  content: "−";
  color: var(--neon);
}

.page-about .tl-year {
  display: block;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1;
}

.page-about .tl-main {
  display: grid;
  gap: 6px;
}

.page-about .tl-stage {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .tl-title {
  color: var(--white);
  margin: 0;
}

.page-about .tl-sum {
  font-size: 14px;
  line-height: 1.6;
}

.page-about .tl-detail {
  margin-top: 14px;
}

.page-about .tl-detail p {
  margin: 0;
}

.page-about .tl-detail p + p {
  margin-top: 1em;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  align-items: stretch;
}

.page-about .team-col {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .team-col__num {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neon-deep);
}

.page-about .team-col__title {
  margin: 0;
  color: var(--white);
}

.page-about .team-col__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cool);
}

.page-about .team-col__list {
  list-style: none;
  margin: 4px 0 0;
  padding: 12px 0 0;
  display: grid;
  gap: 8px;
  border-top: 1px solid var(--line);
}

.page-about .team-col__list li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .team-col__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--neon-deep);
}

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

/* ---------- 每天在维护什么 ---------- */

.page-about .about-ops {
  align-items: start;
}

.page-about .about-ops__head .h2 {
  margin: 10px 0 0;
  max-width: 16ch;
}

.page-about .about-ops__lede {
  margin: 0 0 clamp(20px, 3vw, 30px);
  color: var(--cool);
}

.page-about .ops-table {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .ops-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ops-row dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--neon-deep);
}

.page-about .ops-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cool);
}

/* ---------- 规模与合规 ---------- */

.page-about .about-scale__media {
  margin: 0 0 clamp(26px, 3.6vw, 44px);
}

.page-about .about-scale__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat {
  background: var(--ink-800);
  padding: clamp(18px, 2.6vw, 28px);
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .stat__value {
  display: block;
  font-size: clamp(30px, 5vw, 50px);
  line-height: 1;
}

.page-about .stat__label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-legal {
  margin-top: clamp(32px, 4.4vw, 54px);
}

.page-about .about-legal .eyebrow {
  margin: 0 0 14px;
}

.page-about .legal-table {
  width: 100%;
  border-collapse: collapse;
  border-top: 1px solid var(--line);
}

.page-about .legal-table th,
.page-about .legal-table td {
  text-align: left;
  padding: 14px 16px 14px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  font-size: 14px;
  line-height: 1.7;
}

.page-about .legal-table th {
  width: 108px;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
}

.page-about .legal-table td {
  color: var(--cool);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta__box {
  display: grid;
  gap: 16px;
  padding: clamp(26px, 3.6vw, 46px);
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(59, 240, 200, 0.07), transparent 55%),
    var(--ink-800);
}

.page-about .about-cta__title {
  margin: 0;
  max-width: 26ch;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--cool);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

.page-about .about-cta__links {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
}

.page-about .about-cta__links a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ops-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 768px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .tl-item {
    padding: 0 0 44px 0;
  }

  .page-about .tl-item::before {
    left: var(--about-year-col);
    top: 22px;
  }

  .page-about .tl-item::after {
    left: var(--about-year-col);
    top: 24px;
    width: 22px;
  }

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

  .page-about .tl-head {
    grid-template-columns: var(--about-year-col) minmax(0, 1fr);
    gap: 0 40px;
    align-items: start;
  }

  .page-about .tl-detail {
    margin-left: calc(var(--about-year-col) + 40px);
    max-width: 68ch;
  }

  .page-about .legal-table th {
    width: 140px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-lead__head {
    padding-right: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-head::after {
    transition: none;
  }
}
<<<END>>>