.page-about {
  --about-rail: 190px;
  background: var(--ink);
  color: var(--cream);
  overflow-x: clip;
}

/* 面包屑 */
.page-about .about-crumb {
  padding-block: 20px 6px;
}
.page-about .crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--lichen);
}
.page-about .crumb__link {
  color: var(--lichen);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .crumb__link:hover,
.page-about .crumb__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-about .crumb__sep {
  color: var(--line-mid);
}
.page-about .crumb [aria-current="page"] {
  color: var(--cream);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 4.5vw, 56px) clamp(34px, 5.5vw, 68px);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(900px 460px at 8% -12%, rgba(55, 224, 206, 0.13), transparent 62%),
    radial-gradient(760px 420px at 94% -4%, rgba(255, 106, 43, 0.11), transparent 60%),
    var(--ink);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.28;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .about-hero .kicker {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 17em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 5.4vw, 64px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--cream);
  text-wrap: balance;
}
.page-about .about-hero__lede {
  margin: 0 0 clamp(26px, 4vw, 44px);
  max-width: 40em;
  font-family: var(--font-sans);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--lichen);
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--line-soft);
  overflow: hidden;
}
.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px 16px;
  background: var(--moss);
}
.page-about .about-hero__stats .stat__value {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: clamp(32px, 5.6vw, 52px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--cream);
  font-variant-numeric: tabular-nums;
}
.page-about .about-hero__stats .stat__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--lichen);
}

/* 主体骨架 */
.page-about .about-body {
  padding-block: clamp(36px, 6vw, 72px);
}
.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
}

/* 左侧章节索引 */
.page-about .about-rail {
  align-self: start;
}
.page-about .about-rail__title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-mid);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lichen);
}
.page-about .rail-list {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 13.5px;
  color: var(--lichen);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--cream);
  background: var(--moss);
  border-color: var(--cyan);
}
.page-about .rail-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--orange);
}

/* 章节通用 */
.page-about .about-flow {
  display: grid;
  gap: clamp(46px, 6vw, 84px);
  min-width: 0;
}
.page-about .about-chapter {
  scroll-margin-top: 92px;
  min-width: 0;
}
.page-about .about-chapter .kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--lichen);
}
.page-about .about-chapter .kicker::after {
  content: "";
  flex: 1 1 auto;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent 72%);
}
.page-about .chapter-code {
  color: var(--orange);
  font-weight: 700;
  letter-spacing: 0.1em;
}
.page-about .about-chapter__title {
  margin: 0 0 16px;
  max-width: 20em;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.28;
  letter-spacing: -0.005em;
  color: var(--cream);
}
.page-about .about-chapter__intro {
  margin: 0 0 24px;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--lichen);
}
.page-about .prose p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--lichen);
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* 图片容器兜底 */
.page-about .img-frame {
  margin: 0;
  border: 1px solid var(--line-mid);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--stone);
}
.page-about .img-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.03);
}
.page-about .img-frame__cap {
  display: block;
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  color: var(--lichen);
}

/* A-01 起点 */
.page-about .origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}
.page-about .origin-grid__fig {
  margin: 0;
}

/* A-02 时间线 */
.page-about .timeline {
  position: relative;
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--clay), rgba(194, 102, 63, 0.16));
}
.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 20px 92px minmax(0, 1fr);
  column-gap: 16px;
  align-items: start;
}
.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 12px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--clay);
  border-radius: 50%;
  background: var(--ink);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(55, 224, 206, 0.14);
}
.page-about .tl-year {
  grid-column: 2;
  padding-top: 2px;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: clamp(28px, 3.6vw, 44px);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--cream);
  font-variant-numeric: tabular-nums;
}
.page-about .tl-card {
  grid-column: 3;
  padding: 18px 18px 16px;
  border: 1px solid var(--line-mid);
  border-radius: var(--radius);
  background: var(--moss);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.page-about .tl-card:hover,
.page-about .tl-card:focus-within,
.page-about .tl-card:focus {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-panel);
}
.page-about .tl-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
.page-about .tl-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.42;
  color: var(--cream);
}
.page-about .tl-card__text {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.78;
  color: var(--lichen);
}
.page-about .tl-card__more {
  max-height: 0;
  margin-top: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.32s var(--ease), opacity 0.26s var(--ease), margin-top 0.32s var(--ease);
}
.page-about .tl-card:hover .tl-card__more,
.page-about .tl-card:focus .tl-card__more,
.page-about .tl-card:focus-within .tl-card__more {
  max-height: 260px;
  margin-top: 12px;
  opacity: 1;
}
.page-about .tl-card__more p {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-mid);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.78;
  color: var(--lichen);
}
.page-about .timeline-figure {
  margin: 0;
  padding-left: 0;
}

/* A-03 团队 */
.page-about .team-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}
.page-about .team-top__fig {
  margin: 0;
}
.page-about .team-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}
.page-about .team-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--stone);
}
.page-about .team-col--lead {
  border-color: var(--line-mid);
  background: var(--moss);
}
.page-about .team-col__num {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: clamp(40px, 6vw, 62px);
  line-height: 0.95;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}
.page-about .team-col h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.4;
  color: var(--cream);
}
.page-about .team-col p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--lichen);
}
.page-about .team-col ul {
  margin: 0;
  padding-left: 16px;
  display: grid;
  gap: 6px;
  font-size: 14px;
  line-height: 1.76;
  color: var(--lichen);
}

/* A-04 数据流转 */
.page-about .flow-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--line-soft);
  overflow: hidden;
}
.page-about .flow-step {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 20px 18px;
  background: var(--stone);
}
.page-about .flow-step__code {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.page-about .flow-step h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.4;
  color: var(--cream);
}
.page-about .flow-step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--lichen);
}
.page-about .data-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--line-soft);
  overflow: hidden;
}
.page-about .data-stats .stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 16px 14px;
  background: var(--ink);
}
.page-about .data-stats .stat__value {
  font-family: var(--font-num);
  font-weight: 600;
  font-size: clamp(28px, 4.2vw, 42px);
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}
.page-about .data-stats .stat__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  line-height: 1.5;
  color: var(--lichen);
}
.page-about .data-note {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--lichen);
  padding-left: 14px;
  border-left: 2px solid var(--clay);
}

/* A-05 合作生态 */
.page-about .partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 22px;
}
.page-about .partner-card {
  padding: 18px;
  border: 1px solid var(--line-mid);
  border-radius: var(--radius);
  background: var(--moss);
}
.page-about .partner-card__num {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: clamp(32px, 5vw, 46px);
  line-height: 1;
  color: var(--clay);
  font-variant-numeric: tabular-nums;
}
.page-about .partner-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.4;
  color: var(--cream);
}
.page-about .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--lichen);
}

/* A-06 行业反馈 */
.page-about .tag-strip {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  padding: 4px 0 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  border-bottom: 1px solid var(--line-soft);
  scrollbar-width: thin;
}
.page-about .tag-strip:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}
.page-about .tag {
  flex: 0 0 auto;
  scroll-snap-align: start;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line-mid);
  border-left: 2px solid var(--orange);
  border-radius: var(--radius);
  background: var(--stone);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--cream);
  white-space: nowrap;
}
.page-about .tag em {
  font-style: normal;
  color: var(--cyan);
}

/* 尾段入口 */
.page-about .about-next {
  margin-top: clamp(40px, 6vw, 76px);
  border-top: 1px solid var(--line-mid);
  background: linear-gradient(180deg, var(--moss), var(--ink) 88%);
}
.page-about .about-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding-block: clamp(34px, 5vw, 58px);
}
.page-about .about-next h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.35;
  color: var(--cream);
}
.page-about .about-next p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--lichen);
}
.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border: 1px solid var(--line-mid);
  border-radius: var(--radius);
  background: transparent;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--cream);
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .btn--solid {
  border-color: var(--orange);
  background: var(--orange);
  color: #14100C;
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
  padding-right: 28px;
}
.page-about .btn--solid:hover,
.page-about .btn--solid:focus-visible {
  border-color: var(--cyan);
  background: var(--cyan);
}
.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(55, 224, 206, 0.08);
}
.page-about .btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* 响应式 */
@media (min-width: 560px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .data-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .flow-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
    gap: 30px;
  }
  .page-about .team-top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: start;
  }
  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .team-columns {
    grid-template-columns: 2.1fr 1.5fr 1fr;
    align-items: stretch;
  }
  .page-about .timeline-figure {
    padding-left: 20px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }
  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }
  .page-about .rail-list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .rail-link {
    border-color: transparent;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 9px 10px;
  }
  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    border-color: transparent;
    border-left-color: var(--cyan);
    background: var(--moss);
  }
}

@media (max-width: 719px) {
  .page-about .tl-item {
    grid-template-columns: 18px minmax(0, 1fr);
    column-gap: 14px;
  }
  .page-about .timeline::before {
    left: 8px;
  }
  .page-about .tl-item::before {
    left: 2px;
    top: 8px;
  }
  .page-about .tl-year {
    grid-column: 2;
    padding-top: 0;
    margin-bottom: 2px;
    font-size: 30px;
  }
  .page-about .tl-card {
    grid-column: 2;
  }
  .page-about .about-chapter .kicker {
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about,
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
<<<END>>>