.page-about {
  --about-body: rgba(244, 234, 215, .86);
  --about-rail: 250px;
  --about-glow: radial-gradient(120% 90% at 82% 0%, rgba(108, 75, 214, .3), transparent 62%);
  background: var(--canvas);
  color: var(--paper);
  overflow-x: clip;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 20px 0 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

.page-about .breadcrumb__list a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--orange);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--line-strong);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 60px) 0 clamp(32px, 6vw, 68px);
  background: var(--about-glow);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
}

.page-about .about-hero__rail {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(13, 33, 56, .74);
  padding: 18px 18px 8px;
}

.page-about .about-hero__rail-label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__facts {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--mist);
}

.page-about .about-hero__facts li:last-child {
  border-bottom: 0;
}

.page-about .about-hero__facts strong {
  color: var(--paper);
  font-weight: 600;
  font-size: 14px;
}

.page-about .about-hero__kicker {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .about-hero__body h1 {
  margin: 0 0 16px;
  font-size: clamp(34px, 6.4vw, 68px);
  line-height: 1.03;
  letter-spacing: -.01em;
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero__body .lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 18px;
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .about-stat {
  display: grid;
  gap: 4px;
  padding: 14px 0 6px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-stat .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 600;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-stat .stat__label {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* 章节头部 */
.page-about .about-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(20px, 3.4vw, 34px);
  padding-top: clamp(6px, 2vw, 14px);
  border-top: 1px solid var(--line);
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--paper);
}

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

/* 时间轴 */
.page-about .about-timeline {
  padding: clamp(30px, 5vw, 60px) 0;
}

.page-about .about-timeline__layout {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-index {
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  padding: 16px;
}

.page-about .about-index__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-index__list {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border-left: 2px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .about-index__list a .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  background: var(--cyan);
  color: var(--canvas);
  border-left-color: var(--orange);
}

.page-about .about-index__list a:hover .mono,
.page-about .about-index__list a:focus-visible .mono {
  color: var(--canvas);
}

.page-about .about-index__figure {
  margin: 18px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-index__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 7;
  object-fit: cover;
}

.page-about .about-timeline__stream {
  position: relative;
  display: grid;
  gap: clamp(16px, 3vw, 26px);
  padding-left: 22px;
}

.page-about .about-timeline__stream::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(108, 75, 214, .75) 45%, rgba(255, 154, 61, .8));
}

.page-about .about-stage {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--canvas-2);
  padding: clamp(18px, 3vw, 28px);
  transition: border-color .25s ease, transform .25s ease;
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--canvas);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(61, 224, 232, .14);
}

.page-about .about-stage:hover,
.page-about .about-stage:focus-within {
  border-color: rgba(61, 224, 232, .5);
  transform: translateY(-2px);
}

.page-about .about-stage__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .18em;
  color: var(--orange);
}

.page-about .about-stage h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 29px);
  line-height: 1.2;
  color: var(--paper);
}

.page-about .about-stage p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-body);
}

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

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--orange);
}

.page-about .about-stage__points {
  display: grid;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stage__points li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-body);
}

.page-about .about-stage__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .58em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--cyan);
}

.page-about .about-stage__note {
  margin: 16px 0 0;
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--nebula);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-stage__figure {
  margin: 18px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--canvas-3);
}

.page-about .about-stage__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-stage__figure figcaption {
  padding: 10px 14px 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* 数据字段表 */
.page-about .about-fields {
  margin: 18px 0;
  padding: 16px 16px 8px;
  border-radius: var(--radius-md);
  color: var(--ink);
}

.page-about .about-fields__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.page-about .about-fields .data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.page-about .about-fields .data-table th,
.page-about .about-fields .data-table td {
  padding: 9px 8px;
  text-align: left;
  border-bottom: 1px solid var(--line-paper);
}

.page-about .about-fields .data-table th {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--ink-soft);
  font-weight: 600;
}

.page-about .about-fields .data-table td:first-child {
  font-family: var(--font-mono);
  color: var(--ink);
  white-space: nowrap;
}

.page-about .about-fields .data-table td:last-child {
  color: var(--ink-soft);
}

.page-about .about-fields .data-table tr:last-child td {
  border-bottom: 0;
}

/* iOS 四维 */
.page-about .about-dimensions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 16px 0;
}

.page-about .about-dimension {
  padding: 11px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: rgba(108, 75, 214, .12);
}

.page-about .about-dimension .mono {
  display: block;
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-dimension p {
  margin: 4px 0 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--paper);
}

/* 团队 */
.page-about .about-team {
  padding: clamp(30px, 5vw, 60px) 0;
  background: linear-gradient(180deg, transparent, rgba(18, 41, 63, .55) 40%, transparent);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.page-about .about-team__card {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--canvas-2);
}

.page-about .about-team__num {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 40px);
  font-weight: 600;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-team__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--paper);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .about-team__card--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: transparent;
}

.page-about .about-team__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.page-about .about-rhythm {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rhythm li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

.page-about .about-rhythm li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .5em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--nebula);
}

/* 服务与联系 */
.page-about .about-service {
  padding: clamp(30px, 5vw, 64px) 0 clamp(40px, 6vw, 80px);
}

.page-about .about-service__grid {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .about-service__card {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-lg);
  color: var(--ink);
}

.page-about .about-service__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.page-about .about-contact-list {
  display: grid;
  gap: 10px;
}

.page-about .about-contact-list div {
  display: grid;
  gap: 3px;
  padding-bottom: 9px;
  border-bottom: 1px dashed var(--line-paper);
}

.page-about .about-contact-list__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--ink-soft);
}

.page-about .about-contact-list__value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-about .about-service__note {
  margin: 14px 0 18px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-service__btn {
  display: inline-block;
}

.page-about .about-scope {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-scope a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(13, 33, 56, .6);
  font-size: 14.5px;
  color: var(--paper);
  text-decoration: none;
  transition: border-color .2s ease, background .2s ease, transform .2s ease;
}

.page-about .about-scope__arrow {
  color: var(--orange);
  font-size: 15px;
}

.page-about .about-scope a:hover,
.page-about .about-scope a:focus-visible {
  border-color: var(--cyan);
  background: var(--canvas-3);
  transform: translateX(2px);
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-dimensions {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    align-items: start;
  }

  .page-about .about-head {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: end;
    gap: 28px;
  }

  .page-about .about-head h2 {
    margin-bottom: 0;
  }

  .page-about .about-service__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-timeline__layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
  }

  .page-about .about-timeline__stream {
    padding-left: 30px;
  }

  .page-about .about-timeline__stream::before {
    left: 9px;
  }

  .page-about .about-stage::before {
    left: -30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-scope a {
    transition: none;
  }

  .page-about .about-stage:hover,
  .page-about .about-stage:focus-within,
  .page-about .about-scope a:hover,
  .page-about .about-scope a:focus-visible {
    transform: none;
  }
}

已在上方输出，与 main_html 同步完成。