.page-about {
  --pa-shadow: 7px 7px 0 rgba(8, 11, 10, .6);
  --pa-card-bg: linear-gradient(165deg, rgba(28, 74, 62, .55), rgba(21, 25, 26, .92));
  padding-bottom: clamp(52px, 8vw, 96px);
}

.page-about .pa-crumb-sep {
  color: var(--v2-mist);
  font-family: var(--v2-font-mono);
  font-size: 12px;
  margin: 0 8px;
}

.page-about .pa-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 40px);
  align-items: start;
}

/* 左侧品牌栏 */
.page-about .pa-aside {
  background: linear-gradient(160deg, var(--v2-forest) 0%, var(--v2-carbon) 100%);
  border: 1px solid var(--v2-line-strong);
  padding: clamp(20px, 4vw, 32px);
  box-shadow: var(--pa-shadow);
}

.page-about .pa-eyebrow {
  color: var(--v2-cyan);
  letter-spacing: .18em;
}

.page-about .pa-title {
  font-size: clamp(26px, 5.4vw, 38px);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--v2-paper);
  margin: 14px 0 0;
}

.page-about .pa-lead {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--v2-pale);
}

.page-about .pa-index {
  list-style: none;
  margin: 26px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--v2-line);
  display: grid;
  gap: 2px;
}

.page-about .pa-index__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 8px;
  text-decoration: none;
  color: var(--v2-pale);
  border-left: 2px solid transparent;
  transition: background var(--v2-t), border-color var(--v2-t), color var(--v2-t);
}

.page-about .pa-index__item:hover,
.page-about .pa-index__item:focus-visible {
  background: rgba(53, 241, 208, .07);
  border-left-color: var(--v2-cyan);
  color: var(--v2-paper);
  outline: none;
}

.page-about .pa-index__num {
  font-family: var(--v2-font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--v2-cyan);
  min-width: 3.4ch;
}

.page-about .pa-index__label {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--v2-mist);
}

.page-about .pa-index__item:hover .pa-index__label {
  color: var(--v2-pale);
}

.page-about .pa-aside__note {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--v2-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--v2-mist);
}

.page-about .pa-aside__note a,
.page-about .pa-link {
  color: var(--v2-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 241, 208, .4);
  transition: border-color var(--v2-t), color var(--v2-t);
}

.page-about .pa-aside__note a:hover,
.page-about .pa-link:hover {
  color: var(--v2-amber);
  border-bottom-color: var(--v2-amber);
}

/* 右侧正文 */
.page-about .pa-body {
  min-width: 0;
  display: grid;
  gap: clamp(44px, 7vw, 76px);
}

.page-about .pa-h2 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0 0 16px;
  font-size: clamp(21px, 3.4vw, 30px);
  font-weight: 300;
  line-height: 1.3;
  letter-spacing: .01em;
  color: var(--v2-paper);
  scroll-margin-top: 96px;
}

.page-about .pa-num {
  font-family: var(--v2-font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--v2-cyan);
  flex: none;
}

.page-about .pa-p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--v2-pale);
  max-width: 70ch;
}

.page-about .pa-p--after {
  margin-top: 22px;
}

/* 使用场景 */
.page-about .pa-scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 24px;
}

.page-about .pa-scene {
  border-top: 1px solid var(--v2-line-strong);
  padding-top: 14px;
}

.page-about .pa-scene__t {
  margin: 0 0 7px;
  font-size: 15px;
  font-weight: 500;
  color: var(--v2-paper);
}

.page-about .pa-scene__d {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--v2-mist);
}

/* 图片 */
.page-about .pa-figure {
  position: relative;
  margin: 0 0 28px;
  border: 1px solid var(--v2-line-strong);
  background: var(--v2-carbon);
  overflow: hidden;
}

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

.page-about .pa-figure__cap {
  position: absolute;
  right: 0;
  bottom: 0;
  padding: 6px 10px;
  background: var(--v2-ink);
  color: var(--v2-mist);
  font-family: var(--v2-font-mono);
  font-size: 10.5px;
  letter-spacing: .12em;
}

.page-about .pa-figure--sm {
  margin-bottom: 0;
}

/* 时间线 */
.page-about .pa-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 0 26px;
}

.page-about .pa-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--v2-cyan) 0%, rgba(53, 241, 208, .1) 100%);
}

.page-about .pa-stage {
  position: relative;
  margin-bottom: 18px;
}

.page-about .pa-stage:last-child {
  margin-bottom: 0;
}

.page-about .pa-stage::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--v2-carbon);
  border: 2px solid var(--v2-cyan);
}

.page-about .pa-stage:last-child::before {
  background: var(--v2-amber);
  border-color: var(--v2-amber);
}

.page-about .pa-card {
  background: var(--pa-card-bg);
  border: 1px solid var(--v2-line-strong);
  padding: 18px 18px 20px;
  box-shadow: var(--pa-shadow);
}

.page-about .pa-stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .pa-stage__year {
  font-family: var(--v2-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  padding: 3px 8px;
  background: var(--v2-amber);
  color: var(--v2-ink);
}

.page-about .pa-stage__title {
  font-size: 16px;
  font-weight: 500;
  color: var(--v2-paper);
}

.page-about .pa-stage__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--v2-pale);
}

/* 质量校验 */
.page-about .pa-quality {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.page-about .pa-steps {
  margin-top: 26px;
  border-top: 1px solid var(--v2-line-strong);
}

.page-about .pa-step {
  border-bottom: 1px solid var(--v2-line);
}

.page-about .pa-step summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .pa-step summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--v2-font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--v2-cyan);
  transition: color var(--v2-t), transform var(--v2-t);
}

.page-about .pa-step[open] summary::after {
  content: "−";
  color: var(--v2-amber);
}

.page-about .pa-step summary:focus-visible {
  outline: 2px solid var(--v2-cyan);
  outline-offset: 2px;
}

.page-about .pa-step__idx {
  font-family: var(--v2-font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--v2-mist);
}

.page-about .pa-step__name {
  font-size: 15px;
  color: var(--v2-paper);
}

.page-about .pa-step__body {
  margin: 0;
  padding: 0 0 18px 34px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--v2-pale);
}

/* 合作数据 */
.page-about .pa-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--v2-line-strong);
  border: 1px solid var(--v2-line-strong);
  margin: 24px 0;
}

.page-about .pa-stat {
  background: var(--v2-carbon);
  padding: 22px 18px;
}

.page-about .pa-stat__n {
  display: block;
  font-family: var(--v2-font-mono);
  font-size: clamp(30px, 5.2vw, 44px);
  line-height: 1;
  color: var(--v2-cyan);
}

.page-about .pa-stat__n--amber {
  color: var(--v2-amber);
}

.page-about .pa-stat__l {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--v2-mist);
}

/* 团队技能树 */
.page-about .pa-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: start;
}

.page-about .pa-team__main {
  min-width: 0;
}

.page-about .pa-tree {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
}

.page-about .pa-tree__node {
  position: relative;
  padding: 0 0 22px 30px;
}

.page-about .pa-tree__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--v2-carbon);
  border: 2px solid var(--v2-teal);
  border-radius: 1px;
}

.page-about .pa-tree__node::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 22px;
  bottom: 0;
  width: 1px;
  background: var(--v2-line-strong);
}

.page-about .pa-tree__node:last-child::after {
  display: none;
}

.page-about .pa-tree__node:last-child::before {
  background: var(--v2-amber);
  border-color: var(--v2-amber);
}

.page-about .pa-tree__t {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--v2-paper);
}

.page-about .pa-tree__t em {
  font-family: var(--v2-font-mono);
  font-style: normal;
  font-size: 12.5px;
  color: var(--v2-cyan);
  margin-left: 6px;
  letter-spacing: .04em;
}

.page-about .pa-tree__d {
  margin: 5px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--v2-mist);
}

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

@media (min-width: 640px) {
  .page-about .pa-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

@media (min-width: 900px) {
  .page-about .pa-shell {
    grid-template-columns: minmax(0, 318px) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-about .pa-aside {
    position: sticky;
    top: 96px;
  }

  .page-about .pa-quality {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 30px;
  }

  .page-about .pa-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, .68fr);
    gap: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .pa-index__item,
  .page-about .pa-step summary::after,
  .page-about .pa-link {
    transition: none;
  }
}
<<<END>>>