.page-about {
  --about-rail-w: 128px;
  --about-stage-gap: clamp(28px, 4vw, 64px);
  display: block;
}

/* ---------- 页头 ---------- */
.page-about .crumbs {
  margin-top: clamp(14px, 2vw, 24px);
}

.page-about .about-masthead {
  padding-block: clamp(20px, 3vw, 36px) clamp(22px, 3vw, 40px);
}

.page-about .about-masthead h1 {
  margin: 14px 0 0;
  max-width: 18ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6vw, 68px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.78;
  color: var(--mist);
  opacity: 0.85;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .page-about .about-facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1000px) {
  .page-about .about-facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .about-facts li {
  background: var(--ink);
  padding: 16px 18px;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-facts__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .about-facts__v {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.2;
  color: var(--mist);
}

/* ---------- 主体舞台 ---------- */
.page-about .about-stage {
  display: grid;
  gap: var(--about-stage-gap);
  padding-block: clamp(28px, 4vw, 56px) clamp(40px, 6vw, 88px);
  align-items: start;
}

@media (min-width: 1000px) {
  .page-about .about-stage {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }
}

/* ---------- 左侧章节轨 ---------- */
.page-about .about-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

@media (min-width: 1000px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--rail) + 22px);
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  text-decoration: none;
  color: var(--steel);
  font-size: 14px;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

@media (min-width: 1000px) {
  .page-about .about-rail__list a {
    border: 0;
    border-left: 2px solid var(--line);
    padding: 11px 0 11px 12px;
    white-space: normal;
  }
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--mist);
  border-color: var(--orange);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(26px, 3.6vw, 48px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 88px;
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: 18px;
}

.page-about .about-chapter__no {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  padding-top: 8px;
  color: var(--orange);
  min-width: 2.4ch;
}

.page-about .about-chapter h2 {
  margin: 0;
  font-size: clamp(23px, 3.1vw, 36px);
  line-height: 1.22;
}

.page-about .about-p {
  margin: 0 0 16px;
  max-width: 66ch;
  line-height: 1.78;
  color: var(--mist);
  opacity: 0.86;
}

.page-about .about-p a,
.page-about .about-note a,
.page-about .about-coverage a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, 0.4);
}

.page-about .about-p a:hover,
.page-about .about-note a:hover,
.page-about .about-coverage a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .about-note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel);
  max-width: 70ch;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3vw, 38px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--orange);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* ---------- 历程刻度 ---------- */
.page-about .about-track {
  list-style: none;
  margin: clamp(26px, 3vw, 40px) 0 0;
  padding: 0;
  display: grid;
}

.page-about .about-track__item {
  position: relative;
  padding: 0 0 24px 24px;
  border-left: 1px solid var(--line);
  display: grid;
  gap: 6px;
}

.page-about .about-track__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--orange);
}

.page-about .about-track__epoch {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-track__body h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  color: var(--mist);
}

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

/* ---------- 团队三栏 ---------- */
.page-about .about-teams {
  margin-top: clamp(22px, 3vw, 32px);
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: 1fr;
}

@media (min-width: 820px) {
  .page-about .about-teams { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.page-about .about-team {
  background: var(--ink-2);
  padding: 22px 20px 24px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-team .tag {
  justify-self: start;
}

.page-about .about-team h3 {
  margin: 2px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--mist);
}

.page-about .about-team p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--steel);
}

.page-about .about-team ul {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .about-team li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--steel);
}

.page-about .about-team li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

/* ---------- 上线链路 ---------- */
.page-about .about-flow-list {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-flow-list li {
  background: var(--ink);
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 6px;
  align-items: start;
}

@media (min-width: 760px) {
  .page-about .about-flow-list li {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 22px;
    padding: 22px 8px;
  }
}

.page-about .about-flow-list__n {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-flow-list__b h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  color: var(--mist);
}

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

/* ---------- 地区与支持 ---------- */
.page-about .about-coverage {
  margin-top: clamp(20px, 3vw, 30px);
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

@media (min-width: 880px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  }
}

.page-about .about-coverage__main h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--mist);
}

.page-about .about-coverage__main p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-coverage__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .about-cities {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-cities li {
  background: var(--deep-teal);
  padding: 12px 6px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-support {
  margin-top: clamp(22px, 3vw, 32px);
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: 1fr;
}

@media (min-width: 620px) {
  .page-about .about-support { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1040px) {
  .page-about .about-support { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .about-support > div {
  background: var(--ink);
  padding: 16px 18px;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-support__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .about-support__v {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}

/* ---------- 长期价值 ---------- */
.page-about .about-reasons {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  grid-template-columns: 1fr;
}

@media (min-width: 620px) {
  .page-about .about-reasons { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1040px) {
  .page-about .about-reasons { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

.page-about .about-reasons li {
  background: var(--ink-2);
  padding: 22px 18px 24px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-reasons__v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-reasons__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-reasons__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-cta {
  margin-top: clamp(24px, 3vw, 34px);
  padding-top: 22px;
  border-top: 1px solid var(--rule-line, var(--line));
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
<<<END>>>

.page-about {
  --rule-line: currentColor;
}