.page-about {
  --about-narrow: 40rem;
  --about-gap: clamp(1.5rem, 4vw, 3rem);
  --about-pad: clamp(3rem, 8vw, 6rem);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(2rem, 6vw, 3.5rem) 0 clamp(2.5rem, 6vw, 4rem);
  background:
    radial-gradient(115% 85% at 88% 6%, rgba(255, 106, 26, 0.18), transparent 58%),
    radial-gradient(90% 70% at 4% 96%, rgba(51, 240, 206, 0.12), transparent 60%),
    linear-gradient(158deg, var(--bp-night) 0%, var(--bp-navy) 58%, var(--bp-indigo) 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -40% auto;
  width: min(46rem, 78vw);
  height: min(46rem, 78vw);
  border: 1px solid rgba(51, 240, 206, 0.14);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero .bp-container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .bp-crumbs {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-hero__eyebrow {
  color: var(--bp-cyan);
}

.page-about .about-hero__title {
  margin: 0.6rem 0 0;
  max-width: 24ch;
  font-size: clamp(2rem, 6.4vw, 3.75rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  max-width: 38rem;
  margin: clamp(1rem, 2.5vw, 1.6rem) 0 0;
  color: var(--bp-mist);
}

/* 首屏数据条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--bp-glass-line);
  border-radius: var(--bp-radius);
  overflow: hidden;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.1rem 1.15rem 1.25rem;
  background: rgba(5, 13, 26, 0.82);
}

.page-about .about-stats__num {
  font-family: var(--bp-mono);
  font-size: clamp(1.6rem, 4.6vw, 2.4rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--bp-cyan);
}

.page-about .about-stats__label {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--bp-mist);
}

/* ============ 章节通用 ============ */
.page-about .about-section {
  position: relative;
  padding: var(--about-pad) 0;
}

.page-about .about-section--navy { background: var(--bp-navy); }
.page-about .about-section--indigo { background: var(--bp-indigo); }
.page-about .about-section--teal { background: var(--bp-teal); }
.page-about .about-section--night { background: var(--bp-night); }

.page-about .about-section--last {
  padding-bottom: calc(var(--about-pad) + 1rem);
}

.page-about .about-band {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(0.7rem, 2vw, 1.1rem);
  padding: 0 2.2rem 1rem 0;
  margin-bottom: var(--about-gap);
  border-bottom: 2px solid var(--bp-orange);
}

.page-about .about-band__num {
  font-family: var(--bp-mono);
  font-size: clamp(1.35rem, 3.6vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--bp-orange);
}

.page-about .about-band__title {
  margin: 0;
  font-size: clamp(1.4rem, 4vw, 2.15rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--bp-white);
}

.page-about .about-band__note {
  position: absolute;
  right: 0;
  top: 0.15rem;
  writing-mode: vertical-rl;
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  color: var(--bp-mist);
  opacity: 0.8;
}

.page-about .about-prose {
  max-width: var(--about-narrow);
  margin: 0;
  font-size: clamp(0.98rem, 1.6vw, 1.08rem);
  line-height: 1.85;
  color: rgba(244, 250, 255, 0.84);
}

/* ============ 01 团队 ============ */
.page-about .about-roster {
  margin-top: clamp(2rem, 5vw, 3rem);
}

.page-about .about-roster__bar {
  display: flex;
  gap: 3px;
  height: 16px;
  margin-bottom: 1.35rem;
  border-radius: 999px;
  overflow: hidden;
  background: var(--bp-glass);
}

.page-about .about-roster__seg {
  display: block;
  height: 100%;
  min-width: 6px;
  border-radius: 2px;
}

.page-about .about-roster__seg--cut { flex: 16 1 0; background: var(--bp-orange); }
.page-about .about-roster__seg--data { flex: 12 1 0; background: var(--bp-cyan); }
.page-about .about-roster__seg--edit { flex: 8 1 0; background: var(--bp-mist); }
.page-about .about-roster__seg--tech { flex: 6 1 0; background: rgba(244, 250, 255, 0.55); }

.page-about .about-roster__list {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  margin: 0;
  padding: 1px;
  list-style: none;
  background: var(--bp-glass-line);
  border-radius: var(--bp-radius);
  overflow: hidden;
}

.page-about .about-roster__item {
  flex: 1 1 100%;
  min-width: 0;
  padding: 1.3rem 1.2rem 1.4rem;
  background: rgba(5, 13, 26, 0.7);
  border-top: 2px solid transparent;
  transition: background 240ms var(--bp-ease);
}

.page-about .about-roster__item--cut { border-top-color: var(--bp-orange); }
.page-about .about-roster__item--data { border-top-color: var(--bp-cyan); }
.page-about .about-roster__item--edit { border-top-color: var(--bp-mist); }
.page-about .about-roster__item--tech { border-top-color: rgba(244, 250, 255, 0.55); }

.page-about .about-roster__item:hover,
.page-about .about-roster__item:focus-within {
  background: rgba(11, 30, 51, 0.95);
}

.page-about .about-roster__count {
  display: block;
  font-family: var(--bp-mono);
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--bp-white);
}

.page-about .about-roster__role {
  margin: 0.55rem 0 0.45rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--bp-white);
}

.page-about .about-roster__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--bp-mist);
}

/* 媒体 */
.page-about .about-media {
  margin: clamp(2rem, 5vw, 3rem) 0 0;
}

.page-about .about-media--strip .bp-media__img {
  width: 100%;
  aspect-ratio: 5 / 2;
  object-fit: cover;
  border-radius: var(--bp-radius);
}

.page-about .about-media--mid {
  margin: clamp(2rem, 5vw, 3rem) 0 0;
}

.page-about .about-media--mid .bp-media__img {
  width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  border-radius: var(--bp-radius);
}

.page-about .about-media .bp-media__cap {
  margin-top: 0.7rem;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--bp-mist);
}

/* ============ 02 流程 ============ */
.page-about .about-split {
  display: grid;
  gap: clamp(2rem, 5vw, 3rem);
}

.page-about .about-flow {
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--bp-glass-line);
  border-radius: var(--bp-radius);
  overflow: hidden;
}

.page-about .about-flow__step {
  position: relative;
  padding: 1.15rem 1.2rem 1.3rem 3.6rem;
  background: rgba(5, 13, 26, 0.62);
}

.page-about .about-flow__idx {
  position: absolute;
  left: 1.2rem;
  top: 1.15rem;
  font-family: var(--bp-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--bp-orange);
}

.page-about .about-flow__name {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--bp-white);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--bp-mist);
}

.page-about .about-highlight {
  margin-top: clamp(1.5rem, 3.5vw, 2rem);
  padding: 1.1rem 1.25rem;
  border-left: 3px solid var(--bp-cyan);
  background: rgba(51, 240, 206, 0.07);
  border-radius: 0 var(--bp-radius) var(--bp-radius) 0;
}

.page-about .about-highlight__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--bp-white);
}

.page-about .about-highlight__num {
  font-family: var(--bp-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--bp-cyan);
  padding: 0 0.12em;
}

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

.page-about .about-split__media .bp-media__img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--bp-radius);
}

/* ============ 03 数据 ============ */
.page-about .about-chain {
  display: grid;
  gap: 1px;
  margin-top: clamp(2rem, 5vw, 3rem);
  background: var(--bp-glass-line);
  border-radius: var(--bp-radius);
  overflow: hidden;
}

.page-about .about-chain__item {
  padding: 1.35rem 1.25rem 1.5rem;
  background: rgba(5, 13, 26, 0.62);
}

.page-about .about-chain__tag {
  color: var(--bp-cyan);
  border-color: rgba(51, 240, 206, 0.45);
}

.page-about .about-chain__name {
  margin: 0.75rem 0 0.45rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--bp-white);
}

.page-about .about-chain__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--bp-mist);
}

.page-about .about-fields {
  margin-top: clamp(2rem, 5vw, 3rem);
}

.page-about .about-fields__title {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--bp-white);
}

.page-about .about-fields__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fields__item {
  padding: 0.5rem 1rem;
  font-size: 0.88rem;
  letter-spacing: 0.05em;
  color: var(--bp-white);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--bp-glass-line);
  border-radius: 999px;
}

/* ============ 04 历程 ============ */
.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 1rem;
  margin-top: clamp(2rem, 5vw, 3rem);
  padding-left: 1.4rem;
  border-left: 1px solid rgba(157, 178, 196, 0.32);
}

.page-about .about-node {
  position: relative;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--bp-glass-line);
  border-radius: var(--bp-radius);
  overflow: hidden;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -1.4rem;
  top: 1.55rem;
  width: 9px;
  height: 9px;
  margin-left: -4px;
  border-radius: 50%;
  background: var(--bp-orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, 0.18);
}

.page-about .about-node__summary {
  display: block;
  padding: 1.1rem 1.15rem 1rem;
  cursor: pointer;
  list-style: none;
  border-top: 2px solid var(--bp-orange);
}

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

.page-about .about-node__summary:focus-visible {
  outline: 2px solid var(--bp-cyan);
  outline-offset: -2px;
}

.page-about .about-node__stage {
  display: block;
  font-family: var(--bp-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--bp-orange);
}

.page-about .about-node__title {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--bp-white);
}

.page-about .about-node__text {
  margin: 0;
  padding: 0 1.15rem 1.25rem;
  font-size: 0.87rem;
  line-height: 1.78;
  color: var(--bp-mist);
}

.page-about .about-node[open] {
  background: rgba(11, 30, 51, 0.92);
}

/* ============ 05 合作 ============ */
.page-about .about-partners {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-partners__side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border-radius: var(--bp-radius);
  overflow: hidden;
  background: var(--bp-glass-line);
}

.page-about .about-plate {
  padding: 1.2rem 1.15rem 1.35rem;
  background: rgba(5, 13, 26, 0.78);
}

.page-about .about-plate__num {
  display: block;
  font-family: var(--bp-mono);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--bp-cyan);
}

.page-about .about-plate__text {
  margin: 0.6rem 0 0;
  font-size: 0.85rem;
  line-height: 1.72;
  color: var(--bp-mist);
}

.page-about .about-topics {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(15rem, 84%);
  gap: 1rem;
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 0 0 0.9rem;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-topic {
  scroll-snap-align: start;
  padding: 1.25rem 1.2rem 1.4rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--bp-glass-line);
  border-radius: var(--bp-radius);
}

.page-about .about-topic__tag {
  font-size: 0.68rem;
}

.page-about .about-topic__name {
  margin: 0.7rem 0 0.5rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--bp-white);
}

.page-about .about-topic__text {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--bp-mist);
}

.page-about .about-whitepaper {
  margin-top: clamp(2rem, 5vw, 3rem);
  padding: clamp(1.4rem, 4vw, 2rem);
  background:
    linear-gradient(120deg, rgba(51, 240, 206, 0.1), transparent 65%),
    rgba(5, 13, 26, 0.7);
  border: 1px solid var(--bp-glass-line);
  border-radius: var(--bp-radius);
}

.page-about .about-whitepaper__title {
  margin: 0 0 0.7rem;
  font-size: clamp(1.1rem, 2.6vw, 1.4rem);
  font-weight: 800;
  color: var(--bp-white);
}

.page-about .about-whitepaper__text {
  max-width: var(--about-narrow);
  margin: 0 0 1.4rem;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--bp-mist);
}

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

/* ============ 收尾 ============ */
.page-about .about-outro {
  padding: var(--about-pad) 0;
  background:
    radial-gradient(100% 120% at 10% 0%, rgba(255, 106, 26, 0.16), transparent 60%),
    linear-gradient(200deg, var(--bp-navy) 0%, var(--bp-night) 100%);
}

.page-about .about-outro__title {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(1.5rem, 4.4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--bp-white);
}

.page-about .about-outro__text {
  max-width: 34rem;
  margin: 1rem 0 0;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--bp-mist);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

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

  .page-about .about-roster__item--cut { flex: 16 1 0; }
  .page-about .about-roster__item--data { flex: 12 1 0; }
  .page-about .about-roster__item--edit { flex: 8 1 0; }
  .page-about .about-roster__item--tech { flex: 6 1 0; }

  .page-about .about-chain {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-topics {
    grid-auto-columns: minmax(16rem, 46%);
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-split__media {
    position: sticky;
    top: calc(var(--bp-frame-top) + 2rem);
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 1.1rem;
    padding: 2.5rem 0 0;
    border-left: 0;
    border-top: 1px solid rgba(157, 178, 196, 0.32);
  }

  .page-about .about-node::before {
    left: 0;
    top: -2.5rem;
    margin-left: -5px;
  }

  .page-about .about-topics {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow-x: visible;
    padding-bottom: 0;
  }

  .page-about .about-media--strip {
    margin-top: clamp(2.5rem, 5vw, 3.5rem);
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__lede {
    max-width: 42rem;
  }

  .page-about .about-prose {
    font-size: 1.06rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-roster__item {
    transition: none;
  }
}
<<<END>>>