.page-about {
  --about-rail: clamp(1.5rem, 4vw, 2.5rem);
  --about-cut: 18px;
  --about-paper-shadow: 0 14px 30px rgba(3, 19, 15, .55);
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  padding-block: clamp(1rem, 3vw, 1.5rem) 0;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--ink-dim);
}

.page-about .breadcrumbs a {
  color: var(--ink-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .breadcrumbs__sep {
  color: var(--sage);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--ink-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: end;
  padding: clamp(1.25rem, 3.5vw, 2.75rem);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(53, 242, 208, .10), transparent 55%),
    linear-gradient(158deg, rgba(18, 61, 50, .94), rgba(3, 19, 15, .97) 74%);
  border: 1px solid var(--line-strong);
  clip-path: polygon(
    0 0,
    calc(100% - var(--about-cut)) 0,
    100% var(--about-cut),
    100% 100%,
    var(--about-cut) 100%,
    0 calc(100% - var(--about-cut))
  );
}

.page-about .about-hero__title {
  margin: .7rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 7vw, 4rem);
  line-height: 1.03;
  letter-spacing: -.012em;
  color: var(--ink);
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  max-width: 48ch;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .625rem;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: .4rem;
  padding: .35rem .7rem;
  border: 1px solid var(--line);
  background: rgba(53, 242, 208, .07);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

.page-about .about-hero__facts strong {
  color: var(--cyan);
  font-weight: 700;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.88) contrast(1.06);
}

.page-about .about-stamp {
  position: absolute;
  left: .75rem;
  bottom: .75rem;
  padding: .28rem .6rem;
  background: var(--paper);
  color: #2b1d0e;
  font-family: var(--font-serif);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .08em;
  transform: rotate(-2.5deg);
  box-shadow: var(--about-paper-shadow);
}

/* ---------- 通用章节标题 ---------- */
.page-about .about-section-title {
  margin: .6rem 0 .9rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.2vw, 2.35rem);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--ink);
}

/* ---------- 时间轴 ---------- */
.page-about .about-story__inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-story__intro {
  max-width: 62ch;
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 var(--about-rail);
  display: grid;
  gap: clamp(.75rem, 2vw, 1.1rem);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: .5rem;
  bottom: .5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--amber) 58%, var(--line) 100%);
  opacity: .6;
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  top: 1.28rem;
  left: calc(var(--about-rail) * -1 - 3.5px);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 242, 208, .14);
}

.page-about .about-node {
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color .25s var(--ease);
}

.page-about .about-node > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .35rem .7rem;
  padding: .85rem 1.05rem;
  cursor: pointer;
  list-style: none;
  border-left: 2px solid var(--cyan);
  transition: background-color .25s var(--ease), border-color .25s var(--ease);
}

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

.page-about .about-node > summary:hover {
  background: var(--raise);
}

.page-about .about-node > summary:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: -2px;
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-node__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.0625rem, 2.6vw, 1.3rem);
  color: var(--ink);
}

.page-about .about-node > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--cyan);
}

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

.page-about .about-node[open] > summary {
  background: var(--raise);
  border-left-color: var(--amber);
}

.page-about .about-node__body {
  padding: .95rem 1.05rem 1.1rem;
  border-top: 1px solid var(--line);
  background: var(--bg-deep);
  font-size: .9375rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-node__body p {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team__inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-team__intro p {
  max-width: 56ch;
  margin: 0 0 1.25rem;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-figure {
  margin: 0;
  padding: .45rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

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

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

.page-about .about-figure figcaption {
  padding: .6rem .35rem .2rem;
  font-family: var(--font-serif);
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--ink-dim);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .875rem;
  align-content: start;
}

.page-about .about-role {
  position: relative;
  padding: 1.1rem 1.15rem 1.15rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  transition: background-color .25s var(--ease), transform .25s var(--ease), border-left-color .25s var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  background: var(--raise);
  transform: translateX(4px);
  border-left-color: var(--cyan);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__name {
  margin: .55rem 0 .45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .about-role__scope {
  margin: .7rem 0 0;
  padding-top: .65rem;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: .75rem;
  line-height: 1.65;
  letter-spacing: .02em;
  color: var(--ink-dim);
  transition: color .25s var(--ease);
}

.page-about .about-role:hover .about-role__scope,
.page-about .about-role:focus-within .about-role__scope {
  color: var(--cyan);
}

/* ---------- 内容方法 ---------- */
.page-about .about-method__head {
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .about-method__grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-method__card {
  padding: 1.25rem 1.15rem 1.35rem;
  background: var(--panel);
}

.page-about .about-method__card h3 {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.25;
  color: var(--ink);
}

.page-about .about-method__card p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.76;
  color: var(--ink-soft);
}

.page-about .about-pills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: .85rem 0 0;
  padding: 0;
}

.page-about .about-pills li {
  padding: .24rem .55rem;
  border: 1px solid rgba(255, 177, 59, .45);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .05em;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .about-method .about-figure {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}

/* ---------- 合作与覆盖 ---------- */
.page-about .about-partners__inner {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding: clamp(1.25rem, 3.5vw, 2.25rem);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: linear-gradient(120deg, rgba(12, 46, 38, .9), rgba(6, 31, 26, 0) 78%);
}

.page-about .about-partners__copy p {
  max-width: 60ch;
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-counts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-counts__item {
  padding: .9rem .85rem 1rem;
  background: var(--bg-deep);
}

.page-about .about-counts dt {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--sage);
}

.page-about .about-counts dd {
  margin: .35rem 0 0;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
}

.page-about .about-counts dd .num {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--cyan);
}

/* ---------- 下一阶段 ---------- */
.page-about .about-next__inner {
  display: grid;
  gap: clamp(1.25rem, 3.5vw, 2.25rem);
}

.page-about .about-next__quote {
  position: relative;
  margin: 0;
  padding-left: 1rem;
  border-left: 2px solid var(--amber);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.15rem, 3.4vw, 1.6rem);
  line-height: 1.55;
  color: var(--ink);
}

.page-about .about-next__list {
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .7rem;
}

.page-about .about-next__list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: .9375rem;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .about-next__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: .55rem;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
}

.page-about .about-next__actions .btn {
  flex: 0 1 auto;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-method__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

  .page-about .about-story__inner {
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    align-items: start;
  }

  .page-about .about-story__head {
    position: sticky;
    top: 2rem;
  }

  .page-about .about-team__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    align-items: start;
  }

  .page-about .about-partners__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: center;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, .62fr) minmax(0, 1.38fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-method__grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.16fr) minmax(0, .92fr);
  }

  .page-about .about-method .about-figure {
    max-width: 62%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-node,
  .page-about .about-node > summary,
  .page-about .breadcrumbs a {
    transition: none;
  }

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