.page-about {
  --about-rail-w: 212px;
  --about-pad: clamp(18px, 2.4vw, 28px);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  padding: 32px 0 40px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -140px -12% auto -12%;
  height: 520px;
  background:
    radial-gradient(58% 62% at 82% 12%, var(--glow-a), transparent 70%),
    radial-gradient(46% 54% at 8% 34%, var(--glow-b), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__kicker {
  margin: 20px 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(30px, 6vw, 62px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: var(--c-paper);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 36px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
}

.page-about .about-hero__stats .stat__value {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-hero__stats .stat__unit {
  margin-left: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  color: var(--c-orange);
}

.page-about .about-hero__stats .stat__key {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-gray);
}

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

/* ===== 主体骨架：侧栏 + 长卷 ===== */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  padding-bottom: 72px;
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
  }
}

.page-about .about-rail {
  align-self: start;
  min-width: 0;
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--rail-h) + 88px);
  }
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-gray);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 8px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__link {
  display: inline-block;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-silver);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--c-orange);
  border-color: var(--c-orange);
  background: rgba(255, 107, 44, 0.08);
}

@media (min-width: 1024px) {
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }
  .page-about .about-rail__link {
    display: block;
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 9px 0 9px 14px;
    background: none;
  }
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--c-orange);
    background: linear-gradient(90deg, rgba(255, 107, 44, 0.12), transparent 80%);
  }
}

.page-about .about-rail__foot {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

.page-about .about-rail__foot-label {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--c-gray);
}

/* ===== 章节通用 ===== */
.page-about .about-sec {
  padding: 44px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--rail-h) + 92px);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-about .about-sec > .section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 18px;
  row-gap: 10px;
  margin-bottom: 28px;
}

.page-about .about-sec > .section__head > .section__index {
  grid-column: 1;
  grid-row: 1 / span 2;
  align-self: start;
  white-space: nowrap;
  padding: 4px 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-gray);
  transition: color 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-sec.is-current > .section__head > .section__index {
  color: var(--c-deep);
  background: var(--c-orange);
  border-color: var(--c-orange);
}

.page-about .about-sec > .section__head > .section__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-sec > .section__head > .section__lead {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-width: 72ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .about-h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

/* ===== 分栏 ===== */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .about-prose strong {
  color: var(--c-paper);
  font-weight: 700;
}

.page-about .about-points {
  counter-reset: pt;
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-points li {
  position: relative;
  padding: 14px 16px 14px 48px;
  border-left: 2px solid var(--c-orange);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(199, 210, 228, 0.05);
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-silver);
}

.page-about .about-points li::before {
  counter-increment: pt;
  content: counter(pt, decimal-leading-zero);
  position: absolute;
  left: 15px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
}

.page-about .about-facts {
  display: grid;
  gap: 12px;
}

.page-about .about-fact {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(150deg, rgba(61, 217, 192, 0.1), rgba(255, 107, 44, 0.07) 62%, transparent);
}

.page-about .about-fact--plain {
  background: rgba(199, 210, 228, 0.05);
}

.page-about .about-fact__v {
  display: block;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-fact__k {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-gray);
}

/* ===== 节点 ===== */
.page-about .about-nodes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

@media (min-width: 860px) {
  .page-about .about-nodes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }
}

.page-about .about-node {
  position: relative;
  padding: var(--about-pad);
  border: 1px solid var(--line-strong);
  border-top: 3px solid var(--c-cyan);
  border-radius: var(--radius-m) var(--radius-m) var(--radius-l) var(--radius-l);
  background: rgba(199, 210, 228, 0.05);
  box-shadow: 0 18px 40px -30px rgba(0, 0, 0, 0.85);
}

.page-about .about-node--sz {
  border-top-color: var(--c-orange);
}

.page-about .about-node__title {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .about-node__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .about-node__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed var(--line);
  display: grid;
  gap: 8px;
}

.page-about .about-node__list li {
  display: flex;
  gap: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about .about-node__list li::before {
  content: "›";
  font-family: var(--font-mono);
  color: var(--c-orange);
  line-height: 1.7;
}

/* ===== 图片容器补充 ===== */
.page-about .about-figure {
  margin: 26px 0 0;
}

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

.page-about .about-figure .figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about .about-figure--timeline {
  margin: 0 0 22px;
}

/* ===== 上海 / 云南 ===== */
.page-about .about-panel-soft {
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: linear-gradient(160deg, rgba(199, 210, 228, 0.09), rgba(199, 210, 228, 0.02) 70%);
}

.page-about .about-panel-soft--cyan {
  border-color: rgba(61, 217, 192, 0.32);
  background: linear-gradient(160deg, rgba(61, 217, 192, 0.12), rgba(255, 107, 44, 0.06) 70%, transparent);
}

.page-about .about-panel-soft p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .about-panel-soft .panel__label {
  margin-bottom: 12px;
}

.page-about .about-inline-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-inline-list li {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-silver);
  background: rgba(11, 27, 51, 0.5);
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 0;
}

.page-about .about-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
  font-size: 13px;
  line-height: 1.8;
  color: var(--c-gray);
}

/* ===== 九类参数 ===== */
.page-about .about-params {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .about-params {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-params li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 15px;
  background: var(--c-deep);
}

.page-about .about-params .p-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-orange);
}

.page-about .about-params .p-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .about-params .p-desc {
  font-size: 12px;
  line-height: 1.65;
  color: var(--c-gray);
}

.page-about .about-afterword {
  margin: 22px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--c-cyan);
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .about-afterword a {
  color: var(--c-orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 107, 44, 0.5);
}

.page-about .about-afterword a:hover,
.page-about .about-afterword a:focus-visible {
  border-bottom-color: var(--c-orange);
}

/* ===== 时间轴 ===== */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 72px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__year {
  padding-right: 14px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--c-orange);
}

.page-about .about-timeline__body {
  padding-left: 22px;
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-silver);
}

@media (min-width: 720px) {
  .page-about .about-timeline__item {
    grid-template-columns: 120px minmax(0, 1fr);
  }
  .page-about .about-timeline__item::before {
    left: 120px;
  }
  .page-about .about-timeline__year {
    font-size: 18px;
  }
  .page-about .about-timeline__body {
    padding-left: 30px;
  }
}

/* ===== 团队与资质 ===== */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .about-team .about-figure {
  margin-top: 0;
}

.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.page-about .about-team__stats .about-fact__v {
  font-size: 30px;
}

.page-about .about-fold {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(199, 210, 228, 0.045);
  overflow: hidden;
}

.page-about .about-fold + .about-fold {
  margin-top: 10px;
}

.page-about .about-fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--c-paper);
}

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

.page-about .about-fold summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--c-orange);
}

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

.page-about .about-fold[open] summary {
  border-bottom: 1px solid var(--line);
}

.page-about .about-fold__body {
  padding: 14px 18px 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-silver);
}

/* ===== 生态与覆盖 ===== */
.page-about .about-eco {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

@media (min-width: 700px) {
  .page-about .about-eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-eco {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-eco li {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--c-cyan);
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
  background: rgba(199, 210, 228, 0.04);
}

.page-about .about-eco li:nth-child(even) {
  border-left-color: var(--c-orange);
}

.page-about .eco-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .eco-desc {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about .about-coverage {
  margin-top: 26px;
  padding: var(--about-pad);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-l);
  background: linear-gradient(140deg, rgba(61, 217, 192, 0.1), rgba(11, 27, 51, 0) 62%);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

@media (min-width: 800px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
    gap: 32px;
  }
}

.page-about .about-coverage__v {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--c-paper);
}

.page-about .about-coverage__v span {
  margin-left: 4px;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--c-orange);
}

.page-about .about-coverage__k {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-gray);
}

.page-about .about-coverage__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-gray);
}

/* ===== 结尾引导 ===== */
.page-about .about-cta {
  margin-top: 26px;
  padding: var(--about-pad);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background: var(--c-deep-dark);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

@media (min-width: 800px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
    gap: 28px;
  }
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (max-width: 480px) {
  .page-about .about-cta__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }
}

/* ===== 小屏微调 ===== */
@media (max-width: 619px) {
  .page-about .about-sec > .section__head {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-sec > .section__head > .section__index {
    grid-column: 1;
    grid-row: 1;
    justify-self: start;
  }
  .page-about .about-sec > .section__head > .section__title {
    grid-column: 1;
    grid-row: 2;
  }
  .page-about .about-sec > .section__head > .section__lead {
    grid-column: 1;
    grid-row: 3;
  }
  .page-about .about-params {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-team__stats {
    grid-template-columns: minmax(0, 1fr);
  }
  .page-about .about-timeline__item {
    grid-template-columns: minmax(0, 1fr);
    padding: 16px 0;
  }
  .page-about .about-timeline__item::before {
    display: none;
  }
  .page-about .about-timeline__year {
    display: block;
    padding: 0 0 6px;
  }
  .page-about .about-timeline__body {
    padding-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .about-sec > .section__head > .section__index {
    transition: none;
  }
}
<<<END>>>