.page-about {
  --about-rail-w: 210px;
  --about-side: 132px;
  --about-paper-ink: #17203a;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 4vw, 34px) 0 clamp(34px, 7vw, 72px);
  background:
    radial-gradient(120% 80% at 12% -10%, rgba(123, 92, 255, 0.24), transparent 62%),
    radial-gradient(90% 70% at 96% 8%, rgba(47, 227, 232, 0.13), transparent 64%);
}

.page-about .breadcrumbs {
  margin-bottom: clamp(16px, 3vw, 28px);
}

.page-about .breadcrumbs__current {
  color: var(--muted);
  font-size: 13px;
}

.page-about .about-frame {
  position: relative;
  border: 1px solid var(--line);
  background:
    linear-gradient(158deg, rgba(123, 92, 255, 0.17), rgba(7, 11, 24, 0) 58%),
    var(--ink-deep);
  padding: clamp(20px, 5vw, 54px);
}

.page-about .about-frame::before,
.page-about .about-frame::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
}

.page-about .about-frame::before {
  top: -1px;
  left: -1px;
  border-top: 2px solid var(--cyan);
  border-left: 2px solid var(--cyan);
}

.page-about .about-frame::after {
  right: -1px;
  bottom: -1px;
  border-right: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
}

.page-about .about-scale {
  height: 9px;
  margin-bottom: clamp(16px, 4vw, 30px);
  background-image: repeating-linear-gradient(
    90deg,
    var(--line) 0,
    var(--line) 1px,
    transparent 1px,
    transparent 14px
  );
  background-repeat: repeat-x;
  background-size: 14px 9px;
  opacity: 0.85;
}

.page-about .about-frame .eyebrow {
  color: var(--cyan);
  letter-spacing: 0.12em;
  font-size: 12px;
  margin: 0;
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 7.6vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 16px 0 0;
  max-width: 18ch;
}

.page-about .about-lead {
  margin: clamp(16px, 3vw, 24px) 0 0;
  font-size: clamp(15px, 2.4vw, 18px);
  line-height: 1.85;
  color: var(--muted);
  max-width: 48ch;
}

.page-about .hero-facts {
  list-style: none;
  margin: clamp(22px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 12px;
}

.page-about .hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.page-about .fact-num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 4vw, 26px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .fact-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  padding-top: clamp(20px, 4vw, 36px);
}

.page-about .about-layout {
  display: grid;
  gap: clamp(20px, 4vw, 40px);
  padding-bottom: clamp(40px, 8vw, 96px);
}

/* ---------- 章节索引 ---------- */
.page-about .about-rail {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 12px 0 8px;
}

.page-about .rail-title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .rail-nav {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .rail-nav li {
  flex: 0 0 auto;
}

.page-about .rail-nav a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .rail-nav a:hover {
  color: var(--text);
  border-color: var(--violet);
}

.page-about .rail-nav a[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .rail-idx {
  font-size: 11px;
  letter-spacing: 0.06em;
  opacity: 0.75;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  display: grid;
  gap: clamp(12px, 3vw, 22px);
  padding: clamp(30px, 6vw, 64px) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: clamp(24px, 4vw, 44px);
}

.page-about .about-section__rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .rail-year {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .rail-label {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.1em;
}

.page-about .about-section__body .eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--violet);
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  margin: 0 0 clamp(14px, 2.5vw, 20px);
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2.4vw, 19px);
  line-height: 1.45;
  margin: 0 0 6px;
}

.page-about .about-section__body p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--muted);
}

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

.page-about .section-lead {
  font-size: clamp(15px, 2.2vw, 17px);
  color: var(--text) !important;
  max-width: 58ch;
}

.page-about .about-section a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 227, 232, 0.4);
}

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

/* ---------- 起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: clamp(20px, 4vw, 32px);
}

.page-about .origin-figure {
  margin: 0;
}

.page-about .origin-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.75) brightness(0.86);
}

.page-about .origin-figure figcaption,
.page-about .process-banner figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  border-left: 2px solid var(--violet);
  padding-left: 10px;
}

/* ---------- 流程 ---------- */
.page-about .process-banner {
  margin: clamp(16px, 3vw, 26px) 0 clamp(20px, 4vw, 32px);
}

.page-about .process-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.7) brightness(0.8);
}

.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: step;
}

.page-about .step {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--panel);
  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 .step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 2px;
  background: linear-gradient(90deg, var(--violet), rgba(123, 92, 255, 0));
}

.page-about .step-num {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .step .step-role {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .step .step-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 暖纸摘录 ---------- */
.page-about .paper-note {
  margin: clamp(24px, 5vw, 40px) 0 0;
  padding: clamp(20px, 4vw, 32px) clamp(18px, 4vw, 34px);
  background: var(--paper);
  color: var(--about-paper-ink);
  border-left: 4px solid var(--violet);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .paper-note p {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(16px, 2.8vw, 22px);
  line-height: 1.6;
  font-weight: 600;
  color: var(--about-paper-ink);
}

.page-about .paper-note cite {
  font-style: normal;
  font-size: 12.5px;
  color: #4a5470;
}

.page-about .paper-note--last {
  border-left-color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .team-row {
  padding: 18px 0 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .team-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .team-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
}

.page-about .team-count {
  font-size: 13px;
  color: var(--gold);
}

.page-about .team-bar {
  height: 8px;
  background: rgba(234, 240, 255, 0.07);
  overflow: hidden;
  border-radius: 1px;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  transition: filter 0.25s var(--ease);
}

.page-about .team-bar__fill--data {
  width: 41.6%;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}

.page-about .team-bar__fill--edit {
  width: 33.3%;
  background: linear-gradient(90deg, var(--violet), #a58bff);
}

.page-about .team-bar__fill--product {
  width: 16.6%;
  background: linear-gradient(90deg, var(--cyan), #7ff0f3);
}

.page-about .team-bar__fill--service {
  width: 8.3%;
  background: linear-gradient(90deg, var(--gold), #ffd894);
}

.page-about .team-row:hover .team-bar__fill {
  filter: brightness(1.25);
}

.page-about .team-desc {
  margin: 12px 0 0 !important;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  transition: color 0.25s var(--ease);
}

.page-about .team-row:hover .team-desc {
  color: var(--text);
}

/* ---------- 时间线 ---------- */
.page-about .timeline-wrap {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 4vw, 34px);
  background: var(--ink-deep);
  border: 1px solid var(--line);
}

.page-about .timeline-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  filter: saturate(0.6);
  z-index: 0;
}

.page-about .timeline {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  border-left: 1px dashed var(--line);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: clamp(20px, 3.5vw, 28px);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--violet);
  box-shadow: 0 0 0 4px rgba(123, 92, 255, 0.16);
}

.page-about .tl-item:last-child::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(242, 184, 75, 0.18);
}

.page-about .tl-year {
  margin: 0 0 4px !important;
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--gold) !important;
}

.page-about .tl-title {
  color: var(--text);
}

.page-about .tl-text {
  margin: 0 !important;
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 服务与合作 ---------- */
.page-about .reach-grid {
  display: grid;
  gap: 16px;
}

.page-about .reach-card {
  padding: 20px 18px 22px;
  background: var(--panel);
  border-left: 2px solid var(--violet);
}

.page-about .reach-card:last-child {
  border-left-color: var(--cyan);
}

.page-about .reach-card h3 {
  color: var(--text);
}

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

/* ---------- 做法清单 ---------- */
.page-about .practice-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .practice-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-about .practice-item:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .practice-idx {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--violet);
  padding-top: 3px;
}

.page-about .practice-item h3 {
  font-size: 15.5px;
}

.page-about .practice-item p {
  margin: 0 !important;
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(28px, 5vw, 48px);
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(123, 92, 255, 0.2), rgba(7, 11, 24, 0) 60%),
    var(--ink-deep);
}

.page-about .about-cta .eyebrow {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-cta h2 {
  margin-bottom: 18px;
}

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

/* ---------- 返回顶部 ---------- */
.page-about .to-top {
  position: fixed;
  right: 14px;
  bottom: 16px;
  z-index: 40;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 13px;
  font-size: 12.5px;
  color: var(--text);
  background: rgba(20, 28, 54, 0.92);
  border: 1px solid var(--line);
  opacity: 0;
  pointer-events: none;
  transform: translateY(6px);
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease);
  cursor: pointer;
}

.page-about .to-top[data-visible="true"] {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.page-about .to-top:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.page-about .to-top__arrow {
  font-family: var(--font-mono);
}

/* ---------- 断点 ---------- */
@media (min-width: 600px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .reach-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-section__rail {
    flex-direction: column;
    gap: 4px;
  }
}

@media (min-width: 880px) {
  .page-about .about-section {
    grid-template-columns: var(--about-side) minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 52px);
  }

  .page-about .about-section__rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr) var(--about-rail-w);
    column-gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-main {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
  }

  .page-about .about-rail {
    grid-column: 2;
    grid-row: 1;
    border-top: 0;
    border-bottom: 0;
    padding: 0;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 92px;
  }

  .page-about .rail-nav {
    flex-direction: column;
    gap: 0;
    overflow-x: visible;
    border-left: 1px solid var(--line);
    padding-bottom: 0;
  }

  .page-about .rail-nav a {
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 9px 0 9px 12px;
    white-space: normal;
  }

  .page-about .rail-nav a[aria-current="true"] {
    background: transparent;
    color: var(--cyan);
    border-left-color: var(--cyan);
  }

  .page-about .about-lead {
    max-width: 52ch;
  }

  .page-about .to-top {
    right: 28px;
    bottom: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .to-top,
  .page-about .team-bar__fill,
  .page-about .team-desc,
  .page-about .rail-nav a {
    transition: opacity 0.2s linear;
    transform: none;
  }
}
<<<PAGE_CSS_END>>>