.page-about {
  --about-line: rgba(11, 42, 74, 0.12);
  --about-soft: rgba(11, 42, 74, 0.05);
  --about-mist-line: rgba(247, 249, 252, 0.16);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.25rem, 3vw, 2rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background: var(--bs-paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(46rem, 82vw);
  height: min(46rem, 82vw);
  background: radial-gradient(circle at 32% 32%, rgba(56, 201, 184, 0.22), rgba(244, 183, 64, 0.12) 46%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero > .bs-shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1.5rem, 4vw, 3rem);
}

.page-about .about-hero__title {
  font-family: var(--bs-font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 7vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--bs-ink);
  margin: 0.5rem 0 1rem;
}

.page-about .about-hero__intro {
  color: var(--bs-graphite);
  max-width: 36em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero__figure .bs-media {
  aspect-ratio: 3 / 2;
  border-radius: var(--bs-r-lg);
  overflow: hidden;
  box-shadow: 0 28px 64px -36px rgba(7, 26, 47, 0.5);
}

.page-about .about-plate {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem 0.75rem;
  margin-top: 0.9rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--bs-gold);
}

.page-about .about-plate--stack {
  flex-direction: column;
  align-items: flex-start;
}

.page-about .about-plate__no {
  font-family: var(--bs-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--bs-deep);
  opacity: 0.7;
}

.page-about .about-plate__text {
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--bs-graphite);
  line-height: 1.6;
}

/* ---------- 价值主张 ---------- */
.page-about .about-values {
  background: var(--bs-paper);
}

.page-about .about-values__head {
  max-width: 44rem;
}

.page-about .about-values__list {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-value {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.4rem;
  padding: clamp(1.1rem, 3vw, 1.6rem) 0;
  border-bottom: 1px solid var(--about-line);
  transition: background-color 240ms var(--bs-ease);
}

.page-about .about-value__no {
  font-family: var(--bs-font-mono);
  font-size: 0.85rem;
  color: var(--bs-gold);
  letter-spacing: 0.08em;
}

.page-about .about-value__title {
  font-family: var(--bs-font-display);
  font-size: clamp(1.05rem, 2.4vw, 1.35rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--bs-ink);
  margin: 0 0 0.5rem;
}

.page-about .about-value__body p {
  margin: 0;
  color: var(--bs-graphite);
  line-height: 1.85;
  font-size: 0.95rem;
}

/* ---------- 历程 ---------- */
.page-about .about-history {
  background: linear-gradient(180deg, var(--bs-paper), #ffffff 55%, var(--bs-paper));
}

.page-about .about-history__figure {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-history__figure .bs-media {
  border-radius: var(--bs-r-lg);
  overflow: hidden;
  aspect-ratio: 12 / 5;
  background: linear-gradient(120deg, #071a2f, #0b2a4a 55%, #123b60);
}

.page-about .about-timeline {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-years__title {
  font-family: var(--bs-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--bs-graphite);
  margin: 0 0 0.6rem;
}

.page-about .about-years__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
}

.page-about .about-years__link {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border-radius: var(--bs-r-pill);
  border: 1px solid var(--about-line);
  font-family: var(--bs-font-mono);
  font-size: 0.82rem;
  color: var(--bs-deep);
  text-decoration: none;
  transition: border-color 180ms var(--bs-ease), color 180ms var(--bs-ease), background-color 180ms var(--bs-ease);
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible {
  border-color: var(--bs-gold);
}

.page-about .about-years__link[aria-current] {
  background: var(--bs-deep);
  border-color: var(--bs-deep);
  color: var(--bs-gold);
}

.page-about .about-phases {
  display: grid;
  gap: 0.9rem;
}

.page-about .about-phase {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
  padding: clamp(1rem, 3vw, 1.5rem) clamp(1rem, 3vw, 1.6rem);
  border-radius: var(--bs-r-md);
  border: 1px solid var(--about-line);
  background: #ffffff;
  transition: border-color 220ms var(--bs-ease), transform 220ms var(--bs-ease), box-shadow 220ms var(--bs-ease);
}

.page-about .about-phase:hover,
.page-about .about-phase:focus-within,
.page-about .about-phase:focus {
  border-color: rgba(244, 183, 64, 0.7);
  box-shadow: 0 18px 44px -34px rgba(7, 26, 47, 0.55);
  outline: none;
}

.page-about .about-phase__year {
  font-family: var(--bs-font-mono);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  letter-spacing: -0.02em;
  color: var(--bs-gold);
  margin: 0;
  line-height: 1;
}

.page-about .about-phase__title {
  font-family: var(--bs-font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--bs-ink);
  margin: 0 0 0.4rem;
}

.page-about .about-phase__text {
  margin: 0;
  color: var(--bs-graphite);
  line-height: 1.8;
  font-size: 0.93rem;
}

.page-about .about-phase__more {
  margin: 0.55rem 0 0;
  padding-left: 0.85rem;
  border-left: 2px solid var(--bs-mint);
  color: var(--bs-graphite);
  font-size: 0.88rem;
  line-height: 1.8;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 320ms var(--bs-ease), opacity 240ms var(--bs-ease), margin-top 320ms var(--bs-ease);
}

.page-about .about-phase:hover .about-phase__more,
.page-about .about-phase:focus .about-phase__more,
.page-about .about-phase:focus-within .about-phase__more {
  max-height: 14em;
  opacity: 1;
}

/* ---------- 数据带 ---------- */
.page-about .about-band {
  padding: clamp(2.25rem, 6vw, 4rem) 0;
  background: linear-gradient(135deg, #071a2f 0%, #0b2a4a 58%, #12406a 100%);
  color: var(--bs-paper);
  border-top: 3px solid var(--bs-gold);
}

.page-about .about-band__eyebrow {
  font-family: var(--bs-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--bs-mint);
  margin: 0 0 0.6rem;
}

.page-about .about-band__title {
  font-family: var(--bs-font-display);
  font-size: clamp(1.35rem, 3.6vw, 2.1rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 26em;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
}

.page-about .about-stat {
  padding: 1.15rem 0.85rem 1.15rem 0;
  border-top: 1px solid var(--about-mist-line);
}

.page-about .about-stat:nth-child(-n + 2) {
  border-top: 0;
}

.page-about .about-stat__label {
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: rgba(247, 249, 252, 0.72);
  margin: 0;
}

.page-about .about-stat__value {
  font-family: var(--bs-font-display);
  font-size: clamp(2rem, 5.5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--bs-gold);
  margin: 0.35rem 0 0.4rem;
}

.page-about .about-stat__note {
  font-size: 0.78rem;
  line-height: 1.7;
  color: rgba(247, 249, 252, 0.66);
  margin: 0;
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  background: var(--bs-paper);
}

.page-about .about-flow__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

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

.page-about .about-flow__figure .bs-media {
  aspect-ratio: 1 / 1;
  border-radius: var(--bs-r-lg);
  overflow: hidden;
  box-shadow: 0 26px 60px -40px rgba(7, 26, 47, 0.5);
}

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

.page-about .about-step {
  position: relative;
  padding: 0 0 1.9rem 3.2rem;
}

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

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 1.12rem;
  top: 2.5rem;
  bottom: 0.3rem;
  width: 1px;
  background: var(--bs-mist);
}

.page-about .about-step:last-child::before {
  display: none;
}

.page-about .about-step__no {
  position: absolute;
  left: 0;
  top: 0;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--bs-deep);
  color: var(--bs-gold);
  font-family: var(--bs-font-mono);
  font-size: 0.78rem;
  display: grid;
  place-items: center;
}

.page-about .about-step__title {
  font-family: var(--bs-font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--bs-ink);
  margin: 0.35rem 0 0.4rem;
}

.page-about .about-step__text {
  margin: 0;
  color: var(--bs-graphite);
  line-height: 1.8;
  font-size: 0.93rem;
}

.page-about .about-step__toggle {
  margin-top: 0.5rem;
}

.page-about .about-step__toggle summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--bs-deep);
  padding: 0.3rem 0.85rem 0.3rem 0;
  border-radius: var(--bs-r-pill);
}

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

.page-about .about-step__toggle summary::after {
  content: "+";
  font-family: var(--bs-font-mono);
  color: var(--bs-gold);
  font-size: 0.95rem;
  line-height: 1;
}

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

.page-about .about-step__toggle summary:focus-visible {
  outline: 2px solid var(--bs-sky);
  outline-offset: 3px;
}

.page-about .about-step__toggle p {
  margin: 0.5rem 0 0;
  padding: 0.7rem 0.9rem;
  border-left: 2px solid var(--bs-mint);
  background: var(--about-soft);
  border-radius: 0 var(--bs-r-sm) var(--bs-r-sm) 0;
  color: var(--bs-graphite);
  font-size: 0.87rem;
  line-height: 1.8;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: #ffffff;
}

.page-about .about-team__grid {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.page-about .about-member {
  padding: 1.15rem 1.15rem 1.25rem;
  border: 1px solid var(--about-line);
  border-radius: var(--bs-r-md);
  background: var(--bs-paper);
}

.page-about .about-member__no {
  display: inline-block;
  font-family: var(--bs-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--bs-mint);
  margin-bottom: 0.4rem;
}

.page-about .about-member__title {
  font-family: var(--bs-font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--bs-ink);
  margin: 0 0 0.4rem;
}

.page-about .about-member p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--bs-graphite);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  background: var(--bs-paper);
}

.page-about .about-eco__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-eco__text p {
  color: var(--bs-graphite);
  line-height: 1.85;
  font-size: 0.95rem;
  margin: 0 0 1rem;
}

.page-about .about-eco__text .bs-section__title {
  margin-bottom: 1rem;
}

.page-about .about-eco__text .bs-btn {
  margin-top: 0.4rem;
}

.page-about .about-eco__diagram {
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  border-radius: var(--bs-r-lg);
  border: 1px solid var(--about-line);
  background: linear-gradient(160deg, rgba(56, 201, 184, 0.09), rgba(255, 122, 89, 0.09));
}

.page-about .about-eco__hub {
  align-self: start;
  justify-self: start;
  margin: 0;
  padding: 0.55rem 1.1rem;
  border-radius: var(--bs-r-pill);
  background: var(--bs-deep);
  color: var(--bs-paper);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

.page-about .about-eco__spokes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .about-eco__spokes li {
  position: relative;
  padding: 0.6rem 0.9rem 0.6rem 2.1rem;
  border-radius: var(--bs-r-pill);
  background: #ffffff;
  border: 1px solid rgba(11, 42, 74, 0.1);
  font-size: 0.85rem;
  color: var(--bs-deep);
}

.page-about .about-eco__spokes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 1.8rem;
  height: 1px;
  background: var(--bs-gold);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-top: 0;
}

.page-about .about-next__panel {
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-radius: var(--bs-r-lg);
  border: 1px solid var(--about-line);
  background: #ffffff;
}

.page-about .about-next__head .bs-section__title {
  margin-bottom: 1.25rem;
}

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

.page-about .about-next__list a {
  display: grid;
  gap: 0.25rem;
  padding: 1rem 0.25rem;
  border-top: 1px solid var(--about-line);
  text-decoration: none;
  transition: padding-left 200ms var(--bs-ease);
}

.page-about .about-next__list li:last-child a {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  padding-left: 0.75rem;
}

.page-about .about-next__list a:focus-visible {
  outline: 2px solid var(--bs-sky);
  outline-offset: 2px;
}

.page-about .about-next__label {
  font-family: var(--bs-font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--bs-ink);
}

.page-about .about-next__desc {
  font-size: 0.86rem;
  color: var(--bs-graphite);
  line-height: 1.7;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-value {
    grid-template-columns: 4.5rem minmax(0, 1fr);
    align-items: start;
    gap: 1.25rem;
  }

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

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

  .page-about .about-stat {
    border-top: 0;
    border-left: 1px solid var(--about-mist-line);
    padding: 1rem 1.5rem;
  }

  .page-about .about-stat:nth-child(3n + 1) {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-stat:nth-child(-n + 3) {
    padding-top: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }

  .page-about .about-hero__figure {
    margin-bottom: 0.5rem;
  }

  .page-about .about-timeline {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: start;
  }

  .page-about .about-years {
    position: sticky;
    top: 9rem;
  }

  .page-about .about-years__list {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .about-years__link {
    border: 0;
    border-left: 2px solid var(--about-line);
    border-radius: 0;
    padding: 0.25rem 0 0.25rem 0.8rem;
    font-size: 1.05rem;
  }

  .page-about .about-years__link[aria-current] {
    background: transparent;
    color: var(--bs-gold);
    border-left-color: var(--bs-gold);
  }

  .page-about .about-phase {
    grid-template-columns: 5rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: start;
  }

  .page-about .about-phase__year {
    padding-top: 0.15rem;
  }

  .page-about .about-flow__grid {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }

  .page-about .about-eco__grid {
    grid-template-columns: 7fr 4fr;
    align-items: start;
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .about-next__list a {
    border-top: 0;
    border-left: 2px solid var(--bs-mist);
    padding: 0.25rem 0 0.25rem 0.9rem;
    height: 100%;
    align-content: start;
  }

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

  .page-about .about-next__list a:hover,
  .page-about .about-next__list a:focus-visible {
    padding-left: 1.15rem;
    border-left-color: var(--bs-gold);
  }
}

@media (max-width: 899px) {
  .page-about .about-phase__more {
    max-height: none;
    opacity: 1;
    margin-top: 0.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-phase,
  .page-about .about-phase__more,
  .page-about .about-value,
  .page-about .about-years__link,
  .page-about .about-next__list a {
    transition: none;
  }

  .page-about .about-phase:hover,
  .page-about .about-phase:focus,
  .page-about .about-phase:focus-within {
    transform: none;
  }
}
<<<END>>>