.page-about {
  --ab-rule: rgba(43, 42, 38, 0.14);
  --ab-rule-ink: rgba(232, 217, 191, 0.2);
  background: var(--sand);
  color: var(--charcoal);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--sand);
  padding: clamp(26px, 4vw, 42px) 0 clamp(48px, 7vw, 88px);
  border-bottom: 6px solid var(--clay);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -90px;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(242, 160, 61, 0.18), rgba(242, 160, 61, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(26px, 5vw, 48px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--clay);
}

.page-about .about-crumbs a {
  color: var(--sand);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 217, 191, 0.35);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--gold);
}

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

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 16em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 32em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--sand);
}

.page-about .about-hero__figs {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
  padding-top: 22px;
  border-top: 1px solid var(--ab-rule-ink);
}

.page-about .about-hero__figs dt {
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--stone);
}

.page-about .about-hero__figs dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1;
  color: var(--gold);
}

.page-about .about-hero__unit {
  margin-left: 5px;
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 12px;
  color: var(--stone);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: end;
  }
}

/* ---------- 轨道与栅格 ---------- */
.page-about .about-track {
  background: var(--sand);
  padding: clamp(46px, 7vw, 90px) 0;
}

.page-about .about-track--cream {
  background: var(--cream);
  border-top: 1px solid var(--sand-2);
}

.page-about .about-track__inner {
  display: grid;
  gap: clamp(34px, 5vw, 54px);
}

.page-about .about-track__main {
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .about-track__inner {
    grid-template-columns: minmax(0, 1fr) 248px;
    align-items: start;
    gap: clamp(40px, 5vw, 70px);
  }
}

/* ---------- 章节头 ---------- */
.page-about .about-sec + .about-sec {
  margin-top: clamp(50px, 7vw, 86px);
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  align-items: end;
  padding-top: 18px;
  border-top: 3px solid var(--clay);
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-sec__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(44px, 6.6vw, 76px);
  line-height: 0.78;
  letter-spacing: -0.04em;
  color: var(--clay);
}

.page-about .about-sec__headtext {
  padding-bottom: 2px;
}

.page-about .about-sec__kicker {
  margin: 0 0 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--clay);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(21px, 2.7vw, 31px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-sec__body p {
  margin: 0 0 16px;
  max-width: 34em;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--charcoal);
}

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

/* ---------- 三条原则 ---------- */
.page-about .about-principles {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principle {
  padding: 22px 0;
  border-top: 1px solid var(--sand-2);
}

.page-about .about-principle__no {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-about .about-principle__t {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-principle p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--charcoal);
}

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

  .page-about .about-principle {
    padding: 22px 22px 4px 0;
    border-top: 2px solid var(--sand-2);
  }

  .page-about .about-principle + .about-principle {
    padding-left: 22px;
    border-left: 1px solid var(--ab-rule);
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 26px;
}

.page-about .about-team__copy > p {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--charcoal);
}

.page-about .about-roles {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--sand-2);
}

.page-about .about-roles li {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 2px 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--sand-2);
}

.page-about .about-roles__n {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 23px;
  line-height: 1.15;
  color: var(--clay);
}

.page-about .about-roles__k {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-roles__d {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--charcoal);
}

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

.page-about .about-team__fig img,
.page-about .about-process__fig img,
.page-about .about-band__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 2px;
}

.page-about .about-team__fig figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--sand-2);
  font-size: 12.5px;
  line-height: 1.65;
  color: rgba(43, 42, 38, 0.72);
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    gap: 32px;
    align-items: start;
  }
}

/* ---------- 满幅过渡带 ---------- */
.page-about .about-band {
  background: var(--ink);
  padding: clamp(28px, 4vw, 46px) 0 clamp(30px, 4vw, 46px);
}

.page-about .about-band__fig {
  margin: 0;
  overflow: hidden;
}

.page-about .about-band__cap {
  margin: 15px 0 0;
  max-width: 62em;
  font-size: 13px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 五步流程 ---------- */
.page-about .about-process {
  display: grid;
  gap: 28px;
}

.page-about .about-steps {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: 0;
}

.page-about .about-step {
  position: relative;
  padding: 0 0 4px 30px;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 18px;
  bottom: -2px;
  width: 1px;
  background: linear-gradient(180deg, var(--sand-2), rgba(211, 188, 152, 0.3));
}

.page-about .about-step:last-child::before {
  display: none;
}

.page-about .about-step::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--clay);
}

.page-about .about-step details {
  border-bottom: 1px solid var(--sand-2);
  padding-bottom: 12px;
}

.page-about .about-step summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 6px 0 8px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--clay);
}

.page-about .about-step details[open] summary::after {
  content: "–";
}

.page-about .about-step__no {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--clay);
}

.page-about .about-step__name {
  font-size: 15.5px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-step__time {
  margin-left: auto;
  padding-left: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: rgba(43, 42, 38, 0.62);
  white-space: nowrap;
}

.page-about .about-step__body {
  padding: 2px 0 0;
}

.page-about .about-step__body p {
  margin: 0;
  max-width: 32em;
  font-size: 14px;
  line-height: 1.82;
  color: var(--charcoal);
}

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

@media (min-width: 880px) {
  .page-about .about-process {
    grid-template-columns: minmax(0, 1fr) 180px;
    gap: 30px;
    align-items: start;
  }
}

/* ---------- 成长节点刻度 ---------- */
.page-about .about-tl-scroll {
  overflow-x: auto;
  padding-bottom: 10px;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline {
  display: flex;
  margin: 0;
  padding: 14px 0 0;
  list-style: none;
  min-width: 700px;
}

.page-about .about-timeline__node {
  position: relative;
  flex: 1 1 0;
  min-width: 140px;
  padding: 30px 20px 0 0;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 11px;
  right: 0;
  height: 2px;
  background: var(--sand-2);
}

.page-about .about-timeline__node:last-child::before {
  background: linear-gradient(90deg, var(--sand-2), rgba(211, 188, 152, 0));
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--clay);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-timeline__node--now .about-timeline__dot {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(242, 160, 61, 0.25);
}

.page-about .about-timeline__node:hover .about-timeline__dot {
  transform: scale(1.3);
}

.page-about .about-timeline__era {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(43, 42, 38, 0.6);
}

.page-about .about-timeline__title {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-timeline__desc {
  display: block;
  font-size: 12.5px;
  line-height: 1.72;
  color: rgba(43, 42, 38, 0.72);
}

/* ---------- 侧栏数字 ---------- */
.page-about .about-aside {
  align-self: start;
}

.page-about .about-aside__cap {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clay);
}

.page-about .about-figs {
  margin: 0;
  border-top: 2px solid var(--ink);
}

.page-about .about-figs__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--ab-rule);
}

.page-about .about-figs__row dt {
  font-size: 13px;
  line-height: 1.5;
  color: var(--charcoal);
}

.page-about .about-figs__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 17px;
  color: var(--clay);
  white-space: nowrap;
}

@media (min-width: 1000px) {
  .page-about .about-aside {
    position: sticky;
    top: calc(var(--status-h) + 28px);
  }
}

/* ---------- 收尾指引 ---------- */
.page-about .about-next {
  margin: clamp(34px, 5vw, 54px) 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--sand-2);
  font-size: 14px;
  line-height: 1.95;
  color: var(--charcoal);
}

.page-about .about-next a {
  color: var(--clay);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid rgba(185, 95, 50, 0.42);
}

.page-about .about-next a:hover,
.page-about .about-next a:focus-visible {
  color: var(--ink);
  border-color: var(--ink);
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 520px) {
  .page-about .about-hero__figs {
    gap: 18px 14px;
  }

  .page-about .about-sec__head {
    gap: 8px 10px;
  }

  .page-about .about-sec__num {
    font-size: 40px;
  }

  .page-about .about-roles li {
    grid-template-columns: 38px minmax(0, 1fr);
  }

  .page-about .about-roles__n {
    font-size: 20px;
  }

  .page-about .about-step {
    padding-left: 24px;
  }

  .page-about .about-step::after {
    left: 1px;
  }

  .page-about .about-step::before {
    left: 6px;
  }

  .page-about .about-step__time {
    flex: 1 1 100%;
    margin-left: 0;
    padding-left: 0;
  }
}

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

  .page-about .about-timeline__node:hover .about-timeline__dot {
    transform: none;
  }
}
<<<END>>>