.page-about {
  --about-pad: 52px;
  --about-gap: 20px;
  display: block;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
}

@media (min-width: 900px) {
  .page-about {
    --about-pad: 88px;
    --about-gap: 26px;
  }
}

.page-about * {
  box-sizing: border-box;
}

.page-about .shell {
  width: 100%;
  margin: 0 auto;
}

.page-about .breadcrumbs {
  margin-bottom: 22px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 30px 0 var(--about-pad);
  background:
    linear-gradient(180deg, rgba(20, 49, 42, 0.92) 0%, rgba(11, 31, 26, 0) 66%),
    var(--bg);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  top: 40px;
  width: 300px;
  height: 300px;
  background: linear-gradient(135deg, rgba(63, 240, 200, 0.14), rgba(63, 240, 200, 0) 68%);
  transform: rotate(-18deg);
  pointer-events: none;
}

.page-about .about-hero__kicker {
  color: var(--clay);
  letter-spacing: 0.26em;
  font-size: 12px;
  font-family: var(--mono);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(29px, 5.6vw, 58px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 21ch;
}

.page-about .about-hero__lede {
  margin-top: 18px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  clip-path: var(--cut);
  overflow: hidden;
}

.page-about .about-hero__stat {
  background: var(--panel);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.page-about .about-hero__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-hero__small {
  font-size: 0.52em;
  letter-spacing: 0;
  margin-left: 2px;
}

.page-about .about-hero__unit {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .about-hero__cap {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

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

/* ---------- 章节头部 ---------- */

.page-about .about-chapter {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-chapter--last {
  padding-bottom: calc(var(--about-pad) + 12px);
}

.page-about .about-chapter__head {
  display: grid;
  gap: 10px;
  margin-bottom: 28px;
}

.page-about .about-chapter__num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--clay);
}

.page-about .about-chapter__intro {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
  margin: 0;
}

.page-about .about-footnote {
  margin: 26px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-footnote a,
.page-about .about-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 240, 200, 0.35);
}

.page-about .about-footnote a:hover,
.page-about .about-note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 分栏 ---------- */

.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
}

@media (min-width: 940px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 42px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  }

  .page-about .about-split--reverse > .about-team__figure {
    order: -1;
  }
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line);
}

.page-about .about-node {
  position: relative;
  min-width: 0;
}

.page-about .about-node + .about-node {
  margin-top: 12px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 18px;
  width: 9px;
  height: 9px;
  background: var(--clay);
  transform: rotate(45deg);
}

.page-about .about-node__sum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px 14px;
  padding: 13px 16px;
  background: var(--panel);
  clip-path: var(--cut-sm);
  cursor: pointer;
  list-style: none;
  transition: filter 220ms var(--ease);
}

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

.page-about .about-node__sum:hover {
  filter: brightness(1.18);
}

.page-about .about-node__year {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .about-node__name {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  min-width: 0;
}

.page-about .about-node__mark {
  position: relative;
  width: 20px;
  height: 20px;
  border: 1px solid var(--line);
  flex: none;
}

.page-about .about-node__mark::before,
.page-about .about-node__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--cyan);
}

.page-about .about-node__mark::before {
  width: 10px;
  height: 1px;
  transform: translate(-50%, -50%);
}

.page-about .about-node__mark::after {
  width: 1px;
  height: 10px;
  transform: translate(-50%, -50%);
  transition: transform 220ms var(--ease);
}

.page-about .about-node__d[open] .about-node__mark::after {
  transform: translate(-50%, -50%) scaleY(0);
}

.page-about .about-node__body {
  padding: 14px 4px 6px;
  animation: about-node-in 220ms var(--ease);
}

@keyframes about-node-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 40em;
}

.page-about .about-node__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .about-node__list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-node__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 侧栏 ---------- */

.page-about .about-aside {
  display: grid;
  gap: 18px;
  align-content: start;
  min-width: 0;
}

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

.page-about .media-frame {
  position: relative;
  background: var(--panel-2);
  clip-path: var(--cut);
  overflow: hidden;
}

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

.page-about .media-frame__cap {
  display: block;
  padding: 10px 12px 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .about-note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-band {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(28, 43, 39, 0.85) 0%, rgba(11, 31, 26, 0) 100%),
    var(--bg);
}

.page-about .about-band__head {
  margin-bottom: 26px;
}

.page-about .about-band__figure {
  margin: 0;
  background: var(--panel-2);
  clip-path: var(--cut);
  overflow: hidden;
}

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

.page-about .about-scales {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-scales__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 5px 14px;
  align-items: end;
}

.page-about .about-scales__key {
  font-size: 15px;
  color: var(--ink);
  line-height: 1.5;
}

.page-about .about-scales__val {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
}

.page-about .about-scales__tail {
  font-family: var(--font);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
  font-weight: 400;
}

.page-about .about-scales__track {
  grid-column: 1 / -1;
  height: 4px;
  background: var(--line);
  overflow: hidden;
}

.page-about .about-scales__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--clay), var(--cyan));
}

.page-about .about-scales__fill--a {
  width: 36%;
}

.page-about .about-scales__fill--b {
  width: 55%;
}

.page-about .about-scales__fill--c {
  width: 88%;
}

.page-about .about-scales__fill--d {
  width: 100%;
}

.page-about .about-tags {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-tags .tag {
  display: inline-block;
}

/* ---------- 数据处理流程 ---------- */

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

.page-about .about-flow__step {
  position: relative;
  background: var(--panel);
  clip-path: var(--cut);
  padding: 22px 20px 24px;
  min-width: 0;
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--clay), rgba(180, 101, 63, 0));
}

.page-about .about-flow__num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--orange);
}

.page-about .about-flow__title {
  margin: 8px 0 8px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

@media (min-width: 780px) {
  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 团队 ---------- */

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

.page-about .about-team__body {
  display: grid;
  gap: 18px;
  align-content: start;
  min-width: 0;
}

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

.page-about .about-team__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

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

.page-about .about-team__count {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  min-width: 2.2em;
}

.page-about .about-team__role {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 合作 ---------- */

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

.page-about .about-partner__item {
  background: var(--panel-2);
  clip-path: var(--cut);
  padding: 22px 20px 20px;
  min-width: 0;
}

.page-about .about-partner__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-partner__item p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-partner__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 240, 200, 0.35);
  padding-bottom: 2px;
}

.page-about .about-partner__link::after {
  content: "→";
  font-family: var(--font);
}

.page-about .about-partner__link:hover {
  border-bottom-color: var(--cyan);
}

@media (min-width: 820px) {
  .page-about .about-partner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 运行保障 ---------- */

.page-about .about-assure {
  display: grid;
  gap: 16px;
}

.page-about .about-assure__card {
  background: var(--panel);
  clip-path: var(--cut);
  padding: 20px 20px 22px;
  border-left: 2px solid var(--clay);
  min-width: 0;
}

.page-about .about-assure__label {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .about-assure__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
}

.page-about .about-assure__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-assure__card p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 240, 200, 0.35);
}

@media (min-width: 680px) {
  .page-about .about-assure {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-assure {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 使用场景 ---------- */

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

.page-about .about-usecase {
  background: var(--panel);
  clip-path: var(--cut);
  padding: 22px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.page-about .about-usecase__num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--cyan);
}

.page-about .about-usecase__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-usecase__text {
  margin: 0;
  flex: 1;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-usecase__link {
  font-family: var(--mono);
  font-size: 13.5px;
  letter-spacing: 0.05em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 47, 0.4);
  align-self: flex-start;
  padding-bottom: 2px;
}

.page-about .about-usecase__link:hover {
  border-bottom-color: var(--orange);
}

@media (min-width: 640px) {
  .page-about .about-usecases {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-usecases {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  margin-top: 34px;
  padding: 26px 22px;
  background: var(--panel-2);
  clip-path: var(--cut);
  display: grid;
  gap: 18px;
  align-items: center;
}

@media (min-width: 820px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 30px;
    padding: 28px 30px;
  }
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 44em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__body {
    animation: none;
  }

  .page-about .about-node__mark::after {
    transition: none;
  }
}
<<<END>>>