.page-about {
  --about-rail-w: 210px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(32px, 7vw, 84px));
  background:
    radial-gradient(115% 90% at 84% -12%, rgba(183, 255, 60, .1), transparent 58%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
  overflow: hidden;
}

.page-about .about-hero__copy {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 900px;
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--green);
}

.page-about .about-hero__slash {
  display: inline-block;
  width: 22px;
  height: 2px;
  background: var(--green);
  transform: skewX(-32deg);
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(28px, 5.4vw, 62px);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--text);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 18.5px);
  line-height: 1.9;
  color: var(--text-dim);
}

.page-about .about-hero__band {
  position: relative;
  margin-top: clamp(26px, 4.5vw, 52px);
}

.page-about .about-hero__band img {
  display: block;
  width: 100%;
  height: clamp(230px, 40vw, 470px);
  object-fit: cover;
  filter: saturate(.72) contrast(1.06);
}

.page-about .about-hero__band::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(11, 16, 38, .08) 22%, rgba(11, 16, 38, .9) 100%),
    repeating-linear-gradient(115deg, rgba(242, 235, 221, .045) 0 1px, transparent 1px 14px);
  pointer-events: none;
}

.page-about .about-hero__overlay {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 2;
  padding-bottom: clamp(14px, 2.6vw, 30px);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 22px;
  width: fit-content;
  max-width: 100%;
  margin: 0;
  padding: 16px 22px;
  list-style: none;
  background: rgba(11, 16, 38, .84);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-hero__facts .stat-value {
  font-family: var(--font-mono);
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--green);
}

.page-about .about-hero__facts .stat-label {
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--text-dim);
}

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px 34px;
  }
}

/* ---------- 主体骨架：侧边轨道 + 内容列 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 52px);
  padding-block: clamp(38px, 7vw, 86px);
}

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

.page-about .about-content {
  display: flex;
  flex-direction: column;
  gap: clamp(22px, 3.4vw, 40px);
  min-width: 0;
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 62px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

.page-about .section-index ol {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .section-index a {
  display: flex;
  gap: 11px;
  align-items: baseline;
  padding: 10px 0 10px 13px;
  border-left: 2px solid var(--line);
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.45;
  text-decoration: none;
  transition: color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .section-index a:hover,
.page-about .section-index a:focus-visible {
  color: var(--text);
  border-left-color: var(--muted);
  outline: none;
}

.page-about .section-index a:focus-visible {
  box-shadow: 0 0 0 2px rgba(183, 255, 60, .55);
}

.page-about .section-index a[aria-current="true"] {
  color: var(--green);
  border-left-color: var(--green);
}

.page-about .section-index__num {
  font-family: var(--font-serif);
  font-size: 11.5px;
  letter-spacing: .1em;
  opacity: .8;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-about .about-sec--dark {
  position: relative;
  padding: clamp(22px, 3.4vw, 42px);
  background: var(--ink-800);
  color: var(--text);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-about .about-sec--paper {
  position: relative;
  padding: clamp(22px, 3.4vw, 42px);
  background: var(--paper);
  color: var(--paper-ink);
}

.page-about .about-sec--paper::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: clamp(56px, 12%, 120px);
  height: 3px;
  background: var(--green-deep);
}

.page-about .about-sec__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(18px, 2.8vw, 28px);
}

.page-about .about-sec__num {
  font-family: var(--font-serif);
  font-size: 12.5px;
  letter-spacing: .2em;
  color: var(--green);
}

.page-about .about-sec--paper .about-sec__num {
  color: var(--green-ink);
}

.page-about .about-sec__title {
  margin: 0;
  font-size: clamp(21px, 3.1vw, 32px);
  line-height: 1.28;
  letter-spacing: -.012em;
  color: var(--text);
  text-wrap: balance;
}

.page-about .about-sec--paper .about-sec__title {
  color: var(--paper-ink);
}

.page-about .about-sec__lead {
  margin: 0;
  max-width: 66ch;
  font-size: clamp(14.5px, 1.5vw, 16.5px);
  line-height: 1.9;
  color: var(--text-dim);
}

.page-about .about-sec--paper .about-sec__lead {
  color: rgba(25, 27, 34, .66);
}

.page-about .about-sec p {
  margin: 0 0 13px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--text-dim);
}

.page-about .about-sec--paper p {
  color: rgba(25, 27, 34, .78);
}

.page-about .about-sec p:last-child {
  margin-bottom: 0;
}

/* ---------- 使用场景 ---------- */
.page-about .about-scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-scenes__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--ink-900);
}

.page-about .about-scenes__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--green);
  letter-spacing: .01em;
}

.page-about .about-scenes__desc {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-dim);
}

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

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

/* ---------- 流程 ---------- */
.page-about .about-flow__media {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
}

.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: clamp(180px, 30vw, 300px);
  object-fit: cover;
  filter: saturate(.68) contrast(1.02);
}

.page-about .about-flow__media figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(25, 27, 34, .58);
  padding-left: 12px;
  border-left: 2px solid var(--green-deep);
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-flow__item {
  min-width: 0;
}

.page-about .about-flow details {
  border: 1px solid rgba(25, 27, 34, .16);
  background: rgba(255, 255, 255, .58);
  height: 100%;
}

.page-about .about-flow details[open] {
  border-color: var(--green-deep);
  background: rgba(255, 255, 255, .92);
}

.page-about .about-flow summary {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.page-about .about-flow summary::after {
  content: "+";
  position: absolute;
  top: 12px;
  right: 14px;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--green-ink);
  transition: transform .2s var(--ease);
}

.page-about .about-flow details[open] summary::after {
  content: "−";
}

.page-about .about-flow summary:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--green-ink);
}

.page-about .about-flow__num {
  font-family: var(--font-serif);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--green-ink);
}

.page-about .about-flow__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--paper-ink);
}

.page-about .about-flow__time {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: rgba(25, 27, 34, .55);
}

.page-about .about-flow__body {
  padding: 0 16px 16px;
  border-top: 1px solid rgba(25, 27, 34, .12);
  padding-top: 12px;
}

.page-about .about-flow__body p {
  font-size: 13.5px;
  line-height: 1.85;
  color: rgba(25, 27, 34, .76);
  margin: 0;
}

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }
}

/* ---------- 团队岗位 ---------- */
.page-about .about-roles {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-roles__row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) 40px;
  align-items: center;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-roles__name {
  font-size: 13.5px;
  color: var(--text-dim);
}

.page-about .about-roles__track {
  display: block;
  height: 8px;
  background: var(--ink-700);
  overflow: hidden;
}

.page-about .about-roles__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--green-deep), var(--green));
}

.page-about .about-roles__row:nth-child(1) .about-roles__fill { width: 41%; }
.page-about .about-roles__row:nth-child(2) .about-roles__fill { width: 29%; }
.page-about .about-roles__row:nth-child(3) .about-roles__fill { width: 12%; }
.page-about .about-roles__row:nth-child(4) .about-roles__fill { width: 11%; }
.page-about .about-roles__row:nth-child(5) .about-roles__fill { width: 8%; }

.page-about .about-roles__num {
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  text-align: right;
  color: var(--green);
}

.page-about .about-night {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
  padding: 18px 20px;
  background: var(--ink-900);
  border-left: 3px solid var(--green);
}

.page-about .about-night__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 62px);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--green);
}

.page-about .about-night__title {
  margin: 0 0 8px;
  font-size: 16.5px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-night p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
}

@media (min-width: 700px) {
  .page-about .about-night {
    flex-direction: row;
    align-items: center;
    gap: 26px;
    padding: 22px 26px;
  }

  .page-about .about-night__num {
    flex: 0 0 auto;
  }
}

/* ---------- 十年历程 ---------- */
.page-about .about-history__media {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
}

.page-about .about-history__media img {
  display: block;
  width: 100%;
  height: clamp(160px, 26vw, 260px);
  object-fit: cover;
  filter: saturate(.6) contrast(1.04);
}

.page-about .about-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 30px);
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--green-deep), rgba(25, 27, 34, .18));
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 6px;
  left: -26px;
  width: 14px;
  height: 14px;
  background: var(--paper);
  border: 2px solid var(--green-deep);
  transform: rotate(45deg);
}

.page-about .about-timeline__stage {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--green-ink);
}

.page-about .about-timeline__title {
  margin: 0 0 7px;
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.42;
  color: var(--paper-ink);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.88;
  color: rgba(25, 27, 34, .76);
}

/* ---------- 覆盖与合作 ---------- */
.page-about .about-scope__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-scope__subtitle {
  margin: 0 0 9px;
  font-size: 16.5px;
  line-height: 1.4;
  color: var(--green);
  letter-spacing: .01em;
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 760px) {
  .page-about .about-scope__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(24px, 3.4vw, 46px);
  }
}

/* ---------- 服务与响应 ---------- */
.page-about .about-service__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(18px, 2.8vw, 26px);
  background: rgba(25, 27, 34, .16);
  border: 1px solid rgba(25, 27, 34, .16);
}

.page-about .about-service__card {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 20px 20px 22px;
  background: var(--paper);
}

.page-about .about-service__name {
  margin: 0;
  font-size: 15.5px;
  color: var(--paper-ink);
  letter-spacing: .01em;
}

.page-about .about-service__value {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(14px, 1.6vw, 16.5px);
  word-break: break-all;
  color: var(--green-ink);
}

.page-about .about-service__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.86;
  color: rgba(25, 27, 34, .76);
}

.page-about .about-service__link {
  margin-top: auto;
  align-self: flex-start;
  padding-bottom: 2px;
  font-size: 13.5px;
  color: var(--paper-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--green-deep);
  transition: color .2s var(--ease);
}

.page-about .about-service__link:hover,
.page-about .about-service__link:focus-visible {
  color: var(--green-ink);
  outline: none;
}

.page-about .about-service__tail {
  margin-top: clamp(18px, 2.8vw, 26px);
  padding-top: 16px;
  border-top: 1px dashed rgba(25, 27, 34, .24);
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(25, 27, 34, .72);
  max-width: 66ch;
}

@media (min-width: 760px) {
  .page-about .about-service__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  padding-top: clamp(6px, 1.6vw, 14px);
}

.page-about .about-next__title {
  margin: 0 0 16px;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-next__card {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 16px 18px;
  text-decoration: none;
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: background .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: var(--ink-700);
  border-color: var(--green);
  outline: none;
}

.page-about .about-next__card:focus-visible {
  box-shadow: 0 0 0 2px var(--green);
}

.page-about .about-next__label {
  font-size: 15px;
  font-weight: 600;
  color: var(--green);
}

.page-about .about-next__desc {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text-dim);
}

@media (min-width: 760px) {
  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__card,
  .page-about .section-index a,
  .page-about .about-service__link {
    transition: none;
  }
}
<<<END>>>