.page-about {
  --about-gap: clamp(28px, 5vw, 72px);
  --about-chapter-gap: clamp(30px, 4.5vw, 60px);
  --about-role-line: rgba(11, 61, 58, .14);
}

/* ---------- 面包屑上下文 ---------- */
.page-about .crumb {
  padding-top: 22px;
  padding-bottom: 4px;
}

/* ---------- 首屏：非对称信息塔 + 档案卡 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(34px, 6vw, 76px) 0 clamp(52px, 8vw, 108px);
  background:
    radial-gradient(122% 88% at 84% 6%, rgba(0, 229, 192, .17), transparent 60%),
    linear-gradient(162deg, var(--ink-green) 0%, var(--ink-green-deep) 100%);
  color: var(--text-on-dark);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(0, 229, 192, 0) 74%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -120px;
  bottom: -140px;
  width: 340px;
  height: 340px;
  border: 1px solid var(--line-dark);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-hero__tower h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(33px, 5.6vw, 58px);
  line-height: 1.16;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-hero__tower .lead {
  margin-top: 20px;
  max-width: 46ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--text-on-dark);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__card {
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: rgba(247, 245, 240, .055);
  padding: clamp(20px, 3vw, 32px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__cardtitle {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

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

.page-about .about-facts > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-facts > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-facts dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sage);
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
  text-align: right;
}

/* ---------- 章节标题组 ---------- */
.page-about .about-chapter {
  max-width: 62ch;
  margin-bottom: var(--about-chapter-gap);
}

.page-about .about-chapter h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.24;
  font-weight: 700;
}

.page-about .about-chapter .lead {
  margin-top: 16px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
}

/* ---------- 01 品牌原则：分段切换 ---------- */
.page-about .about-tabs {
  position: relative;
}

.page-about .about-tabs__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  padding: 0;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
}

.page-about .about-tabs__btn {
  display: inline-block;
  padding: 10px 17px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--text-soft);
  background: transparent;
  cursor: pointer;
  transition: color .22s var(--ease), border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .about-tabs__btn:hover {
  border-color: var(--sage);
  color: var(--text);
}

.page-about .about-tabs__radio:focus-visible ~ .about-tabs__bar .about-tabs__btn {
  outline: 2px dashed var(--cyan);
  outline-offset: 3px;
}

.page-about .about-tabs__radio:nth-of-type(1):checked ~ .about-tabs__bar .about-tabs__btn:nth-of-type(1),
.page-about .about-tabs__radio:nth-of-type(2):checked ~ .about-tabs__bar .about-tabs__btn:nth-of-type(2),
.page-about .about-tabs__radio:nth-of-type(3):checked ~ .about-tabs__bar .about-tabs__btn:nth-of-type(3) {
  border-color: var(--ink-green);
  background: var(--ink-green);
  color: var(--cyan-soft);
}

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

.page-about .about-tabs__radio:nth-of-type(1):checked ~ .about-tabs__panels > .about-tabs__panel:nth-child(1),
.page-about .about-tabs__radio:nth-of-type(2):checked ~ .about-tabs__panels > .about-tabs__panel:nth-child(2),
.page-about .about-tabs__radio:nth-of-type(3):checked ~ .about-tabs__panels > .about-tabs__panel:nth-child(3) {
  display: block;
}

.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-list li {
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--cyan);
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-list strong {
  display: block;
  margin-bottom: 4px;
  font-weight: 600;
  color: var(--text);
}

/* ---------- 02 团队构成 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

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

.page-about .about-team__roles {
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  position: relative;
  padding: 20px 22px;
  border: 1px solid var(--about-role-line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

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

.page-about .about-role__no {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-role h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-green);
}

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

/* ---------- 03 版本演进 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-track__item {
  position: relative;
  padding: 0 0 26px 52px;
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: -6px;
  width: 1px;
  background: var(--line-dark);
}

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

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

.page-about .about-track__node {
  position: absolute;
  left: 0;
  top: 3px;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  background: rgba(0, 229, 192, .12);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .about-node > summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  list-style: none;
  cursor: pointer;
  padding: 4px 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.1vw, 21px);
  line-height: 1.4;
  color: var(--paper);
  transition: color .2s var(--ease);
}

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

.page-about .about-node > summary:hover {
  color: var(--cyan-soft);
}

.page-about .about-node > summary:focus-visible {
  outline: 2px dashed var(--cyan);
  outline-offset: 4px;
}

.page-about .about-node > summary::after {
  content: "+";
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--cyan);
}

.page-about .about-node[open] > summary::after {
  content: "\2212";
}

.page-about .about-node__body {
  margin-top: 12px;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-on-dark);
}

.page-about .about-track__figure {
  margin: clamp(32px, 5vw, 56px) 0 0;
}

/* ---------- 04 重庆体验中心 ---------- */
.page-about .about-center__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-center__body h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1.24;
  font-weight: 700;
  color: var(--ink-green);
}

.page-about .about-center__body > p {
  margin-top: 16px;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-center__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-center__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-center__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 9px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-center__meta {
  margin: 28px 0 0;
  padding: 20px 22px;
  border: 1px solid var(--about-role-line);
  border-radius: var(--radius);
  background: var(--mist);
}

.page-about .about-center__meta > div {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-center__meta > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-center__meta dt {
  flex: none;
  width: 5.5em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sage);
}

.page-about .about-center__meta dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-center__meta a {
  color: var(--ink-green);
  text-decoration: underline;
  text-decoration-color: var(--cyan);
  text-underline-offset: 3px;
}

.page-about .about-center__note {
  margin-top: 16px;
  max-width: 56ch;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-center__figure {
  margin: 0;
  aspect-ratio: 3 / 2;
}

/* ---------- 收束索引卡 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-next__card {
  display: block;
  padding: 24px 24px 22px;
  border: 1px solid var(--about-role-line);
  border-top: 3px solid var(--cyan);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
  text-decoration: none;
  transition: transform .24s var(--ease), border-top-color .24s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-3px);
  border-top-color: var(--orange);
}

.page-about .about-next__card:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

.page-about .about-next__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--sage);
}

.page-about .about-next__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-green);
}

.page-about .about-next__card p {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-next__go {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--orange);
  border-bottom: 1px solid var(--orange);
  padding-bottom: 2px;
}

/* ---------- 滚动显现 ---------- */
.js .page-about .about-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

.js .page-about .about-reveal[data-shown] {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .js .page-about .about-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-team__roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    gap: clamp(48px, 7vw, 104px);
  }

  .page-about .about-hero__card {
    margin-top: 26px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-team__figure {
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }

  .page-about .about-center__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: clamp(36px, 5.5vw, 80px);
  }

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

  .page-about .about-track {
    max-width: 78ch;
  }
}
<<<END>>>