.page-about {
  --about-line: rgba(43, 58, 82, .5);
  --about-soft: rgba(43, 58, 82, .28);
  background: linear-gradient(180deg, var(--ink) 0%, #050A14 100%);
  color: var(--text);
  overflow-x: clip;
}

/* ---------- 首屏 · 画册封面 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 20px 0 42px;
  border-bottom: 1px solid var(--about-line);
  background:
    radial-gradient(120% 90% at 100% 0, rgba(53, 240, 192, .16), transparent 58%),
    radial-gradient(90% 70% at 0 100%, rgba(214, 90, 166, .14), transparent 62%),
    var(--ink);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, var(--about-soft) 0 1px, transparent 1px 96px);
  opacity: .55;
  pointer-events: none;
}

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

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .78rem;
  color: var(--text-mute);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--steel);
}

.page-about .breadcrumb__link {
  color: var(--text-dim);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--teal);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  margin-top: 20px;
}

.page-about .about-hero__lede {
  margin: 14px 0 0;
  max-width: 38em;
  color: var(--text-dim);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 7.2vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--paper-2);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-hero__frame {
  position: relative;
  margin: 0;
  border: 1px solid rgba(53, 240, 192, .34);
  background: var(--ink-2);
  clip-path: var(--cut);
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.page-about .about-hero__frame .media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(.72) contrast(1.08);
}

.page-about .about-hero__frame .media-frame__tag {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 4px 9px;
  background: rgba(7, 12, 26, .82);
  color: var(--teal);
  font-size: .68rem;
  letter-spacing: .1em;
}

/* ---------- 数据摘要 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-stats > li {
  background: rgba(17, 27, 48, .94);
  padding: 16px 14px;
}

.page-about .about-stats .num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 6vw, 2.35rem);
  line-height: 1.05;
  color: var(--teal);
}

.page-about .about-stats > li:nth-child(2) .num { color: var(--orange); }
.page-about .about-stats > li:nth-child(3) .num { color: var(--magenta); }

.page-about .about-stats .cap {
  display: block;
  margin-top: 8px;
  font-size: .82rem;
  line-height: 1.55;
  color: var(--text-dim);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  padding: 34px 0 64px;
}

.page-about .about-index {
  padding: 0 0 20px;
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: .7rem;
  letter-spacing: .18em;
  color: var(--text-mute);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar { display: none; }

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--about-line);
  background: rgba(17, 27, 48, .72);
  color: var(--text-dim);
  text-decoration: none;
  font-size: .84rem;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-index__link span {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--teal);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper-2);
  border-color: var(--teal);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: 30px 0 36px;
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-section .eyebrow {
  margin: 0;
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--text-mute);
}

.page-about .about-section__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 5.4vw, 2.2rem);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--paper-2);
}

.page-about .about-section__lede {
  margin: 14px 0 0;
  max-width: 40em;
  color: var(--text-dim);
  font-size: .96rem;
  line-height: 1.85;
}

.page-about .about-section__text {
  margin: 20px 0 0;
  max-width: 40em;
  color: var(--text-dim);
  font-size: .94rem;
  line-height: 1.85;
}

.page-about .about-inline-link {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 192, .45);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--paper-2);
  border-bottom-color: var(--paper-2);
}

/* ---------- 资料体系 ---------- */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-facts > li {
  padding: 14px 12px;
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--steel);
}

.page-about .about-facts > li:nth-child(2) { border-left-color: var(--orange); }
.page-about .about-facts > li:nth-child(3) { border-left-color: var(--magenta); }
.page-about .about-facts > li:nth-child(4) { border-left-color: var(--teal); }

.page-about .about-facts .num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .about-facts > li:nth-child(3) .num { color: var(--magenta); }
.page-about .about-facts > li:nth-child(4) .num { color: var(--teal); }

.page-about .about-facts .cap {
  display: block;
  margin-top: 8px;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .about-file {
  margin-top: 22px;
  padding: 20px 18px 22px;
  background: var(--paper);
  color: var(--ink-2);
  clip-path: var(--cut);
}

.page-about .about-file__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-steps {
  display: grid;
  gap: 16px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.page-about .about-steps > li {
  position: relative;
  padding-left: 40px;
}

.page-about .about-steps > li::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  left: 0;
  top: 0;
  padding: 3px 6px;
  background: var(--ink);
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .06em;
}

.page-about .about-steps__name {
  margin: 0;
  font-weight: 800;
  font-size: .94rem;
  color: var(--ink);
}

.page-about .about-steps__text {
  margin: 6px 0 0;
  font-size: .86rem;
  line-height: 1.75;
  color: #3A4A63;
}

.page-about .about-figure {
  position: relative;
  margin: 24px 0 0;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  clip-path: var(--cut);
  aspect-ratio: 12 / 7;
  overflow: hidden;
}

.page-about .about-figure--tall { aspect-ratio: 4 / 3; }

.page-about .about-figure .media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(.7) contrast(1.06);
}

.page-about .about-figure .media-frame__tag {
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 4px 9px;
  background: rgba(7, 12, 26, .84);
  color: var(--orange);
  font-size: .66rem;
  letter-spacing: .1em;
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 24px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--teal), var(--magenta) 55%, var(--orange));
}

.page-about .about-node {
  position: relative;
  margin-bottom: 4px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 20px;
  width: 9px;
  height: 9px;
  transform: rotate(45deg);
  background: var(--ink);
  border: 2px solid var(--teal);
}

.page-about .about-node__detail[open]::before,
.page-about .about-node__detail[open] .about-node__summary {
  border-color: var(--teal);
}

.page-about .about-node__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  position: relative;
  padding: 13px 30px 13px 0;
  border-bottom: 1px dashed var(--about-line);
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--teal);
}

.page-about .about-node__detail[open] .about-node__summary::after {
  content: "−";
  color: var(--orange);
}

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

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 5vw, 1.7rem);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-node__name {
  font-weight: 800;
  font-size: .98rem;
  color: var(--paper-2);
}

.page-about .about-node__text {
  margin: 12px 0 18px;
  max-width: 40em;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-team__item {
  padding: 16px 14px;
  border: 1px solid var(--about-line);
  background: linear-gradient(160deg, rgba(53, 240, 192, .13), rgba(17, 27, 48, .92) 58%);
  clip-path: var(--cut-sm);
}

.page-about .about-team__item:nth-child(2) {
  background: linear-gradient(160deg, rgba(214, 90, 166, .14), rgba(17, 27, 48, .92) 58%);
}

.page-about .about-team__item:nth-child(3) {
  background: linear-gradient(160deg, rgba(255, 138, 61, .14), rgba(17, 27, 48, .92) 58%);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 7vw, 2.5rem);
  line-height: 1;
  color: var(--teal);
}

.page-about .about-team__item:nth-child(2) .about-team__num { color: var(--magenta); }
.page-about .about-team__item:nth-child(3) .about-team__num { color: var(--orange); }

.page-about .about-team__role {
  margin: 10px 0 4px;
  font-weight: 800;
  font-size: .95rem;
  color: var(--paper-2);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-eco {
  margin-top: 16px;
  padding: 18px 16px;
  background: var(--ink-2);
  border-left: 3px solid var(--magenta);
}

.page-about .about-eco__title {
  margin: 0;
  font-weight: 800;
  font-size: .98rem;
  color: var(--paper-2);
}

.page-about .about-eco__text {
  margin: 10px 0 0;
  max-width: 40em;
  font-size: .9rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-eco__text strong {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--orange);
}

.page-about .about-eco__links {
  margin: 14px 0 0;
  font-size: .9rem;
}

/* ---------- 服务与联系 ---------- */
.page-about .about-service {
  margin-top: 22px;
  padding: 22px 18px 24px;
  background: var(--paper);
  color: var(--ink-2);
  clip-path: var(--cut);
}

.page-about .about-service__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  color: var(--ink);
}

.page-about .about-service__list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-service__list > li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 10px;
  font-size: .87rem;
  line-height: 1.75;
  color: #3A4A63;
}

.page-about .about-service__list > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  background: var(--ink);
  transform: rotate(45deg);
}

.page-about .about-contact {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-contact > li {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(17, 27, 48, .16);
}

.page-about .about-contact__label {
  min-width: 72px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: #4A5A72;
}

.page-about .about-contact__value {
  font-family: var(--font-mono);
  font-size: .88rem;
  color: var(--ink);
  word-break: break-all;
}

.page-about .about-service__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-service__actions .btn--ghost {
  color: var(--ink);
  border-color: rgba(17, 27, 48, .45);
  background: transparent;
}

.page-about .about-service__actions .btn--ghost:hover,
.page-about .about-service__actions .btn--ghost:focus-visible {
  color: var(--paper-2);
  background: var(--ink);
  border-color: var(--ink);
}

/* ---------- 平板 / 桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 26px 0 56px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 42px;
  }

  .page-about .about-stats > li {
    padding: 20px 16px;
  }

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

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 24px;
  }

  .page-about .about-file {
    padding: 24px 24px 26px;
  }

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

  .page-about .about-figure {
    aspect-ratio: 3 / 2;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: 48px;
    align-items: end;
    margin-top: 30px;
  }

  .page-about .about-body {
    display: grid;
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 54px;
    padding: 56px 0 84px;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    align-self: start;
    padding: 4px 0 0 16px;
    border-left: 1px solid var(--about-line);
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }

  .page-about .about-index__link {
    padding: 10px 0;
    border: 0;
    border-bottom: 1px solid transparent;
    background: none;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-bottom-color: var(--teal);
  }

  .page-about .about-section {
    padding: 34px 0 46px;
  }

  .page-about .about-section__lede,
  .page-about .about-section__text {
    font-size: 1rem;
  }

  .page-about .about-file {
    padding: 28px 30px 30px;
    margin-top: 26px;
  }

  .page-about .about-figure {
    margin-top: 30px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__grid {
    gap: 64px;
  }

  .page-about .about-body {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 72px;
  }

  .page-about .about-stats .cap {
    font-size: .86rem;
  }
}

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