.page-about {
  --about-gap: clamp(20px, 3vw, 36px);
  --about-index: 236px;
  --about-panel: rgba(24, 35, 53, .72);
  --about-soft: rgba(147, 164, 186, .1);
  background-color: var(--arena);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  padding-bottom: clamp(40px, 6vw, 88px);
  overflow-x: hidden;
}

.page-about .num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
}

.page-about .about-crumb {
  padding-top: clamp(16px, 2.4vw, 28px);
  font-size: 13px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 640px;
  background:
    radial-gradient(circle at 74% 32%, rgba(53, 224, 208, .12), transparent 62%),
    radial-gradient(circle at 18% 14%, rgba(255, 106, 26, .1), transparent 60%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: center;
  padding-block: clamp(26px, 4.4vw, 56px) clamp(30px, 4.6vw, 60px);
  border-bottom: 1px solid var(--line);
}

@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    gap: clamp(28px, 4vw, 56px);
  }
}

.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
}

.page-about .about-hero__eyebrow-text {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 5.6vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-hero__br {
  display: none;
}

@media (min-width: 720px) {
  .page-about .about-hero__br {
    display: inline;
  }
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: 0 0 12px;
  font-size: clamp(15px, 1.6vw, 17px);
  color: rgba(242, 245, 247, .86);
}

.page-about .about-hero__lead--sub {
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__panel {
  position: relative;
  background: var(--about-panel);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(18px, 2.6vw, 26px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .28);
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  left: clamp(18px, 2.6vw, 26px);
  right: clamp(18px, 2.6vw, 26px);
  top: calc(clamp(18px, 2.6vw, 26px) + 34px);
  height: 1px;
  background: repeating-linear-gradient(to right, var(--line-strong) 0 5px, transparent 5px 11px);
}

.page-about .about-hero__panel-title {
  margin: 0 0 20px;
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-facts {
  display: grid;
  gap: 14px;
  margin: 0;
}

.page-about .about-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-fact__key {
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-fact__val {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
}

.page-about .about-fact__val .num {
  font-size: 24px;
  color: var(--orange);
  margin-right: 2px;
}

.page-about .about-hero__panel-note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 主体：索引 + 章节 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  padding-top: clamp(28px, 4vw, 48px);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-index) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 60px);
    align-items: start;
  }
}

.page-about .about-index {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--about-soft);
  padding: 18px;
}

@media (min-width: 1000px) {
  .page-about .about-index {
    position: sticky;
    top: 28px;
  }
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--mist);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 10px 10px 12px;
  border-radius: var(--r-sm);
  border-left: 2px solid transparent;
  color: rgba(242, 245, 247, .78);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
  transition: background .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  background: rgba(255, 106, 26, .1);
  border-left-color: var(--orange);
  color: var(--ink);
}

.page-about .about-index__num {
  flex: none;
  font-size: 12px;
  color: var(--cyan);
}

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

.page-about .about-index__help {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--line-strong);
}

.page-about .about-index__help-text {
  margin: 0 0 10px;
  font-size: 12px;
  color: var(--mist);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapters {
  display: grid;
  gap: clamp(26px, 3.6vw, 48px);
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--line);
  scroll-margin-top: 90px;
}

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

.page-about .chapter__head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .chapter__num {
  display: inline-block;
  width: fit-content;
  padding: 2px 10px;
  border-radius: var(--pill);
  background: rgba(53, 224, 208, .12);
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: .14em;
  font-weight: 700;
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .chapter__lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  color: var(--mist);
}

.page-about .chapter__text {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  color: rgba(242, 245, 247, .84);
}

.page-about .chapter__text--full {
  max-width: 68ch;
  margin-bottom: clamp(16px, 2.2vw, 24px);
}

.page-about .chapter__split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.4vw, 28px);
  align-items: start;
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

@media (min-width: 860px) {
  .page-about .chapter__split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }
}

.page-about .chapter__figure {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--console);
}

.page-about .chapter__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .chapter__figure figcaption {
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

.page-about .chapter__figure--wide,
.page-about .chapter__figure--tall {
  margin-top: clamp(18px, 2.6vw, 28px);
}

@media (min-width: 760px) {
  .page-about .chapter__figure--wide {
    max-width: 78%;
    margin-inline-start: auto;
  }

  .page-about .chapter__figure--tall {
    max-width: 88%;
  }
}

/* ---------- 地图卡 ---------- */
.page-about .map-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

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

@media (min-width: 1180px) {
  .page-about .map-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .map-card {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--about-panel);
  transition: border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .map-card:hover {
  border-color: rgba(53, 224, 208, .42);
  transform: translateY(-2px);
}

.page-about .map-card__title {
  margin: 2px 0 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .map-card__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 团队矩阵 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 680px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .team-card {
  position: relative;
  padding: 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(24, 35, 53, .9), rgba(14, 22, 38, .82));
  cursor: default;
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus,
.page-about .team-card:focus-within {
  border-color: rgba(255, 106, 26, .48);
  box-shadow: 0 18px 40px rgba(0, 0, 0, .3);
}

.page-about .team-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .team-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .team-card__mark {
  font-size: 20px;
  font-weight: 700;
  color: rgba(147, 164, 186, .5);
  letter-spacing: .1em;
}

.page-about .team-card__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .team-card__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .team-card__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(242, 245, 247, .7);
  border-left: 2px solid var(--orange);
  padding-left: 0;
  transition: max-height .3s var(--ease), opacity .24s var(--ease), margin-top .3s var(--ease), padding-left .3s var(--ease);
}

.page-about .team-card:hover .team-card__more,
.page-about .team-card:focus .team-card__more,
.page-about .team-card:focus-within .team-card__more {
  max-height: 220px;
  opacity: 1;
  margin-top: 12px;
  padding-left: 12px;
}

@media (max-width: 679px) {
  .page-about .team-card__more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
    padding-left: 12px;
  }
}

/* ---------- 流程条 ---------- */
.page-about .flow-strip {
  margin-top: clamp(18px, 2.4vw, 26px);
  padding: 18px;
  border-radius: var(--r-lg);
  border: 1px dashed var(--line-strong);
  background: rgba(14, 22, 38, .6);
}

.page-about .flow-strip__title {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--flag-y);
}

.page-about .flow-strip__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  counter-reset: flow;
}

@media (min-width: 800px) {
  .page-about .flow-strip__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .flow-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num name"
    "num text";
  column-gap: 12px;
  align-items: start;
}

.page-about .flow-step__num {
  grid-area: num;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  color: var(--cyan);
  font-size: 13px;
}

.page-about .flow-step__name {
  grid-area: name;
  font-size: 14px;
  font-weight: 700;
}

.page-about .flow-step__text {
  grid-area: text;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 版本轨道 ---------- */
.page-about .version-track {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding-left: 22px;
}

.page-about .version-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: repeating-linear-gradient(to bottom, var(--line-strong) 0 6px, transparent 6px 12px);
}

@media (min-width: 900px) {
  .page-about .version-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    padding-left: 0;
    padding-top: 26px;
  }

  .page-about .version-track::before {
    left: 14px;
    right: 14px;
    top: 8px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: repeating-linear-gradient(to right, var(--line-strong) 0 6px, transparent 6px 12px);
  }
}

.page-about .version-node {
  position: relative;
  padding: 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--about-panel);
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .version-node::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 18px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--arena);
  border: 2px solid var(--line-strong);
  transition: border-color .18s var(--ease), background .18s var(--ease);
}

@media (min-width: 900px) {
  .page-about .version-node::before {
    left: 0;
    top: -26px;
  }
}

.page-about .version-node:hover,
.page-about .version-node:focus-visible {
  border-color: rgba(255, 106, 26, .5);
  background: rgba(255, 106, 26, .08);
}

.page-about .version-node:hover::before,
.page-about .version-node:focus-visible::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .version-node:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .version-node__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .version-node__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 服务对象 ---------- */
.page-about .serve-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

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

@media (min-width: 1120px) {
  .page-about .serve-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .serve-card {
  display: grid;
  align-content: start;
  gap: 8px;
  padding: 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(14, 22, 38, .7);
}

.page-about .serve-card--contact {
  border-color: rgba(255, 106, 26, .38);
  background: rgba(255, 106, 26, .08);
}

.page-about .serve-card__title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .serve-card__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .serve-card--contact .copy-btn {
  justify-self: start;
  margin-top: 4px;
}

.page-about .serve-card__link {
  justify-self: start;
  font-size: 12.5px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 208, .4);
  padding-bottom: 1px;
}

.page-about .serve-card__link:hover,
.page-about .serve-card__link:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- 收束 ---------- */
.page-about .about-chapter--close {
  padding-bottom: 0;
}

.page-about .next-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(18px, 2.4vw, 26px);
}

@media (min-width: 780px) {
  .page-about .next-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .next-card {
  display: grid;
  gap: 6px;
  padding: 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(24, 35, 53, .92), rgba(7, 11, 20, .9));
  text-decoration: none;
  color: var(--ink);
  transition: border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .next-card__kicker {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .next-card__title {
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.55;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .map-card,
  .page-about .team-card,
  .page-about .team-card__more,
  .page-about .version-node,
  .page-about .version-node::before,
  .page-about .next-card {
    transition: none;
  }

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