.page-about {
  --pg-pad: clamp(18px, 4vw, 40px);
  --pg-gap: clamp(56px, 9vw, 96px);
  padding: calc(var(--bar-h) + 26px) var(--pg-pad) 88px;
  background:
    radial-gradient(ellipse 62% 38% at 90% -4%, rgba(122, 92, 255, 0.16), transparent 72%),
    radial-gradient(ellipse 48% 32% at 4% 42%, rgba(37, 230, 216, 0.07), transparent 70%),
    var(--void);
  color: var(--paper);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: clip;
}

@media (min-width: 1024px) {
  .page-about {
    padding-inline-start: calc(var(--rail-w) + var(--pg-pad));
  }
}

.page-about .pg-wrap {
  max-width: 1180px;
  margin: 0 auto;
}

/* 首屏声明块 */
.page-about .pg-head {
  padding-block: clamp(18px, 4vw, 40px) 0;
  border-bottom: 1px solid var(--line);
  padding-bottom: clamp(28px, 5vw, 52px);
}

.page-about .pg-head h1 {
  font-family: var(--f-display);
  font-size: clamp(28px, 4vw, 56px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin: 14px 0 0;
  max-width: 18em;
  color: var(--paper-bright);
}

.page-about .pg-head__lede {
  max-width: var(--measure);
  margin: 20px 0 0;
  font-family: var(--f-serif);
  font-size: clamp(16px, 2.1vw, 22px);
  line-height: 1.72;
  color: var(--paper);
}

.page-about .pg-figs {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
}

@media (min-width: 760px) {
  .page-about .pg-figs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .pg-figs li {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.page-about .pg-figs b {
  display: block;
  font-family: var(--f-mono);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .pg-figs span {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* 章节骨架：左编号 + 右内容 */
.page-about .pg-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: var(--pg-gap);
}

@media (min-width: 900px) {
  .page-about .pg-row {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 0 34px;
  }
}

.page-about .pg-row__num {
  font-family: var(--f-mono);
  font-size: clamp(40px, 7vw, 84px);
  font-weight: 700;
  line-height: 0.88;
  letter-spacing: -0.04em;
  color: var(--violet);
  opacity: 0.32;
  font-variant-numeric: tabular-nums;
}

@media (min-width: 900px) {
  .page-about .pg-row__num {
    position: sticky;
    top: calc(var(--bar-h) + 26px);
  }
}

.page-about .pg-row__body > h2 {
  font-family: var(--f-display);
  font-size: clamp(21px, 2.6vw, 34px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  color: var(--paper-bright);
  max-width: 24em;
}

.page-about .pg-lede {
  font-family: var(--f-serif);
  font-size: clamp(16px, 1.9vw, 21px);
  line-height: 1.7;
  color: var(--paper);
  max-width: var(--measure);
  margin: 0 0 22px;
}

.page-about .pg-row__body > p {
  max-width: var(--measure);
  margin: 0 0 16px;
  color: #c6cee4;
  font-size: 15.5px;
}

.page-about .pg-row__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 230, 216, 0.45);
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .pg-row__body a:hover {
  color: var(--paper-bright);
  border-bottom-color: var(--paper-bright);
}

.page-about .pg-row__body a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-bottom-color: transparent;
}

/* 定位三条线 */
.page-about .pg-lines {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

@media (min-width: 860px) {
  .page-about .pg-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .pg-lines li {
  border-top: 2px solid var(--violet);
  padding-top: 12px;
}

.page-about .pg-lines li:nth-child(2) {
  border-top-color: var(--cyan);
}

.page-about .pg-lines b {
  display: block;
  font-family: var(--f-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper-bright);
  margin-bottom: 6px;
}

.page-about .pg-lines span {
  display: block;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* 图片容器 */
.page-about .pg-figure {
  margin: 26px 0 0;
  padding: 0;
}

.page-about .pg-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
  object-fit: cover;
}

.page-about .pg-figure figcaption {
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 46em;
}

/* 垂直时间线 */
.page-about .pg-tl {
  position: relative;
  margin-top: 30px;
  padding-left: 28px;
}

.page-about .pg-tl::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(37, 230, 216, 0.06));
}

.page-about .pg-tl__item {
  position: relative;
  margin-bottom: 16px;
}

.page-about .pg-tl__item:last-child {
  margin-bottom: 0;
}

.page-about .pg-tl__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--void);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .pg-tl__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  margin-bottom: 7px;
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .pg-tl__meta .ck-num {
  font-family: var(--f-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .pg-card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 15px 18px;
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
  transition: transform 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .pg-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: calc(var(--cut) * 1.42);
  height: 1px;
  background: var(--line);
  transform: rotate(45deg);
  transform-origin: 0 0;
}

.page-about .pg-card h3 {
  margin: 0 0 6px;
  font-family: var(--f-display);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper-bright);
}

.page-about .pg-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .pg-more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin-top: 0;
  transition: max-height 0.22s var(--ease), opacity 0.22s var(--ease), margin-top 0.22s var(--ease);
}

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

.page-about .pg-tl__item:hover .pg-more,
.page-about .pg-tl__item:focus-within .pg-more {
  max-height: 8em;
  opacity: 1;
  margin-top: 8px;
}

@media (hover: none) {
  .page-about .pg-more {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}

/* 四大分区 */
.page-about .pg-cells {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 26px;
}

@media (min-width: 780px) {
  .page-about .pg-cells {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 26px;
  }
}

.page-about .pg-cell {
  border-left: 2px solid var(--violet);
  padding: 2px 0 2px 16px;
}

.page-about .pg-cell:nth-child(even) {
  border-left-color: var(--cyan);
}

.page-about .pg-cell__tag {
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--violet);
  margin: 0 0 6px;
}

.page-about .pg-cell:nth-child(even) .pg-cell__tag {
  color: var(--cyan);
}

.page-about .pg-cell h3 {
  margin: 0 0 7px;
  font-family: var(--f-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper-bright);
}

.page-about .pg-cell p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* 服务地图点阵 */
.page-about .pg-map {
  margin-top: 26px;
  padding: clamp(14px, 3vw, 26px);
  border: 1px solid var(--line);
  background-color: rgba(14, 23, 48, 0.62);
  background-image: radial-gradient(circle, rgba(37, 230, 216, 0.2) 1px, transparent 1.6px);
  background-size: 20px 20px;
  clip-path: polygon(var(--cut) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut));
}

.page-about .pg-map__title {
  margin: 0 0 14px;
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .pg-map__list {
  display: grid;
  gap: 10px;
}

.page-about .pg-map details {
  background: rgba(7, 12, 28, 0.78);
  border: 1px solid var(--line);
  padding: 11px 14px;
  transition: border-color 0.16s var(--ease);
}

.page-about .pg-map details:hover {
  border-color: rgba(37, 230, 216, 0.6);
}

.page-about .pg-map details[open] {
  border-color: rgba(37, 230, 216, 0.55);
}

.page-about .pg-map summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  font-family: var(--f-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--paper-bright);
}

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

.page-about .pg-map summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .pg-map summary .ck-tag {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  font-weight: 400;
}

.page-about .pg-map ul {
  margin: 10px 0 0;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .pg-map li + li {
  margin-top: 2px;
}

/* 团队技能树 */
.page-about .pg-tree {
  margin-top: 26px;
}

.page-about .pg-tree__root {
  display: inline-block;
  margin: 0 0 14px;
  padding: 7px 14px;
  background: var(--cyan);
  color: #04141a;
  font-family: var(--f-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  clip-path: polygon(10px 0, 100% 0, 100% 100%, 0 100%, 0 10px);
}

.page-about .pg-tree__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

@media (min-width: 780px) {
  .page-about .pg-tree__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 14px;
  }
}

.page-about .pg-node {
  position: relative;
  padding: 12px 14px 12px 24px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.page-about .pg-node::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 18px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--violet);
  transform: rotate(45deg);
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.page-about .pg-node b {
  display: block;
  margin-bottom: 5px;
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .pg-node span {
  display: block;
  font-size: 14px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .pg-node:focus {
  outline: none;
}

.page-about .pg-node:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-color: var(--cyan);
}

.page-about .pg-node:hover,
.page-about .pg-node:focus {
  border-color: var(--cyan);
  background: #101d3d;
}

.page-about .pg-node:hover::before,
.page-about .pg-node:focus::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

/* 三件做法：暖纸白块 */
.page-about .pg-pledge {
  margin-top: 4px;
  padding: clamp(22px, 4vw, 40px);
  background: var(--paper);
  color: #0a1024;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .pg-pledge h2 {
  margin: 0 0 8px;
  font-family: var(--f-display);
  font-size: clamp(20px, 2.5vw, 30px);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #0a1024;
}

.page-about .pg-pledge__lede {
  margin: 0 0 22px;
  font-family: var(--f-serif);
  font-size: 16px;
  line-height: 1.72;
  color: #2b3453;
  max-width: 40em;
}

.page-about .pg-pledge ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .pg-pledge li {
  display: grid;
  gap: 4px 18px;
  padding: 15px 0;
  border-top: 1px solid rgba(10, 16, 36, 0.16);
}

.page-about .pg-pledge li:first-child {
  border-top: none;
  padding-top: 0;
}

@media (min-width: 760px) {
  .page-about .pg-pledge li {
    grid-template-columns: 116px minmax(0, 1fr);
    align-items: baseline;
  }
}

.page-about .pg-pledge__k {
  font-family: var(--f-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #5a3ee0;
}

.page-about .pg-pledge__v {
  display: block;
  font-size: 15px;
  line-height: 1.75;
  color: #1b2440;
}

/* 尾部行动 */
.page-about .pg-next {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  margin-top: clamp(36px, 5vw, 56px);
}

.page-about .pg-next__hint {
  margin: 16px 0 0;
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .pg-next__hint a {
  color: var(--cyan);
}
<<<END>>>