.page-about {
  --about-gutter: clamp(1.1rem, 4vw, 2rem);
  color: var(--fg);
  overflow-x: hidden;
}

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

.page-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  margin: 0;
  padding: 0.9rem 0 0.2rem;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.08em;
  color: var(--fg-dim);
}

.page-about .crumbs__item a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

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

.page-about .crumbs__item[aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.about-hero {
  position: relative;
  padding: clamp(1.4rem, 3vw, 2rem) 0 clamp(2rem, 5vw, 3.2rem);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(122, 92, 255, 0.22), transparent 62%),
    radial-gradient(90% 70% at 6% 110%, rgba(11, 95, 255, 0.18), transparent 60%);
}

.about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

.about-hero__title {
  margin: 0.5rem 0 0;
  font-weight: 900;
  font-size: clamp(2.2rem, 7vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.about-hero__deck {
  max-width: 40ch;
  margin: 1.1rem 0 0;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--fg-soft);
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  align-self: start;
  background: var(--line);
  border: 1px solid var(--line);
}

.about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 0.9rem 1.1rem;
  background: var(--bg-raise);
}

.about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.about-stat__label {
  font-size: var(--fs-sm);
  line-height: 1.5;
  color: var(--fg-dim);
}

/* ---------- 章节目录 ---------- */
.about-toc {
  padding: clamp(1rem, 2.4vw, 1.5rem) 0;
}

.about-toc__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.4rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.about-toc__list a {
  display: inline-block;
  white-space: nowrap;
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.about-toc__list a:hover,
.about-toc__list a:focus-visible {
  border-color: var(--blue);
  color: var(--paper);
  background: rgba(11, 95, 255, 0.18);
}

/* ---------- 章节通用 ---------- */
.about-chapter {
  position: relative;
  padding: clamp(2.4rem, 6vw, 4.4rem) 0;
  scroll-margin-top: var(--header-offset);
}

.about-chapter--ink {
  background: var(--bg-raise);
  color: var(--fg);
}

.about-chapter--plain {
  background:
    linear-gradient(180deg, var(--bg-raise) 0, var(--bg) 22%, var(--bg) 100%);
  color: var(--fg);
}

.about-chapter--paper {
  background: var(--paper);
  color: var(--ink);
}

.about-chapter__head {
  display: grid;
  gap: 0.4rem;
  margin-bottom: clamp(1.4rem, 4vw, 2.4rem);
}

.about-chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 9vw, 5rem);
  font-weight: 300;
  line-height: 0.86;
  color: var(--blue);
  letter-spacing: -0.04em;
}

.about-chapter--paper .about-chapter__num {
  color: var(--blue-deep);
  opacity: 0.55;
}

.about-chapter__title {
  margin: 0.35rem 0 0;
  font-weight: 900;
  font-size: clamp(1.5rem, 4.6vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
}

.about-chapter--paper .about-chapter__title {
  color: var(--ink);
}

.about-split {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.6rem);
}

.about-split > * {
  min-width: 0;
}

.about-copy p {
  max-width: 60ch;
  margin: 0 0 1rem;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--fg-soft);
}

.about-copy p:last-child {
  margin-bottom: 0;
}

.about-chapter--paper .about-copy p {
  color: #2c313a;
}

.about-copy__lead {
  margin: 0 0 1.1rem;
  font-size: var(--fs-body);
  font-weight: 700;
  line-height: 1.7;
  color: var(--paper);
}

/* ---------- 图片 ---------- */
.about-figure {
  margin: 0;
}

.about-figure img {
  width: 100%;
  border: 1px solid var(--line);
}

.about-figure--bleed img {
  border-color: rgba(53, 224, 215, 0.28);
  box-shadow: 0 0 0 1px rgba(11, 95, 255, 0.18) inset;
}

.about-figure--paper img {
  border-color: rgba(11, 13, 18, 0.16);
}

.about-figure figcaption {
  margin-top: 0.6rem;
  font-size: var(--fs-sm);
  line-height: 1.65;
  color: var(--fg-dim);
}

.about-figure--paper figcaption {
  color: #5b616c;
}

/* ---------- 团队条形 ---------- */
.about-bars {
  display: grid;
  gap: 0.85rem;
  margin: 0 0 1.2rem;
  padding: 0;
  list-style: none;
}

.about-bars__row {
  display: grid;
  grid-template-columns: 5.4rem minmax(0, 1fr);
  gap: 0.35rem 0.7rem;
  align-items: center;
}

.about-bars__name {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--paper);
}

.about-bars__track {
  display: block;
  height: 0.55rem;
  background: rgba(201, 206, 216, 0.12);
  overflow: hidden;
}

.about-bars__fill {
  display: block;
  height: 100%;
  width: 62%;
}

.about-bars__fill--blue { width: 92%; background: var(--blue); }
.about-bars__fill--violet { width: 78%; background: var(--violet); }
.about-bars__fill--cyan { width: 64%; background: var(--cyan); }
.about-bars__fill--moss { width: 48%; background: var(--moss); }

.about-bars__note {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.05em;
  color: var(--fg-dim);
}

/* ---------- 时间线 ---------- */
.about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.9rem;
  list-style: none;
}

.about-timeline::before {
  content: "";
  position: absolute;
  top: 0.4rem;
  bottom: 0.6rem;
  left: 0.42rem;
  width: 1px;
  background: linear-gradient(180deg, var(--blue), var(--violet) 55%, var(--amber));
  opacity: 0.7;
}

.about-timeline__item {
  position: relative;
  padding-bottom: 1rem;
}

.about-timeline__dot {
  position: absolute;
  left: -1.66rem;
  top: 1.05rem;
  width: 0.62rem;
  height: 0.62rem;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 3px rgba(11, 95, 255, 0.18);
}

.about-timeline__dot--amber {
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(255, 176, 32, 0.2);
}

.about-node {
  border: 1px solid var(--line);
  background: rgba(20, 24, 33, 0.86);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.about-node:hover {
  border-color: rgba(53, 224, 215, 0.4);
}

.about-node[open] {
  border-color: var(--line-strong);
  background: var(--bg-panel);
}

.about-node__sum {
  display: grid;
  grid-template-columns: 4.6rem minmax(0, 1fr);
  gap: 0.2rem 0.8rem;
  align-items: baseline;
  padding: 0.85rem 0.95rem;
  cursor: pointer;
  list-style: none;
}

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

.about-node__sum::after {
  content: "+";
  grid-column: 2;
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--cyan);
}

.about-node[open] .about-node__sum::after {
  content: "–";
}

.about-node__year {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.about-node__title {
  font-size: var(--fs-body);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.about-node__body {
  padding: 0 0.95rem 1rem;
}

.about-node__body p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--fg-soft);
}

/* ---------- 覆盖与合作 ---------- */
.about-reach {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.4rem);
}

.about-reach__cards {
  display: grid;
  gap: 0.7rem;
  align-content: start;
}

.about-card {
  padding: 1rem 1.1rem 1.15rem;
  border-left: 3px solid var(--blue);
  background: rgba(11, 13, 18, 0.05);
}

.about-card:nth-child(2) { border-left-color: var(--violet); }
.about-card:nth-child(3) { border-left-color: var(--moss); }

.about-card__title {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.about-card p {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: #3a4049;
}

/* ---------- 认可 ---------- */
.about-trust {
  display: grid;
  gap: 0.8rem;
}

.about-trust__item {
  padding: 1.1rem 1.05rem 1.2rem;
  border: 1px solid var(--line);
  background: var(--bg-panel);
}

.about-trust__tag {
  display: inline-block;
  margin: 0 0 0.7rem;
}

.about-trust__item h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 900;
  line-height: 1.4;
  color: var(--paper);
}

.about-trust__item p:last-child {
  margin: 0;
  font-size: var(--fs-sm);
  line-height: 1.75;
  color: var(--fg-soft);
}

/* ---------- 结尾 ---------- */
.about-cta {
  padding: clamp(2.2rem, 6vw, 3.6rem) 0 clamp(2.8rem, 7vw, 4.4rem);
  background:
    linear-gradient(120deg, rgba(11, 95, 255, 0.22), rgba(122, 92, 255, 0.16) 55%, rgba(255, 176, 32, 0.12));
}

.about-cta__inner {
  display: grid;
  gap: 1.3rem;
}

.about-cta__title {
  margin: 0;
  font-weight: 900;
  font-size: clamp(1.4rem, 4vw, 2.1rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.about-cta__text {
  max-width: 46ch;
  margin: 0.7rem 0 0;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--fg-soft);
}

.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-bars__row {
    grid-template-columns: 6.4rem minmax(0, 1fr) 9.5rem;
    align-items: center;
  }

  .about-bars__note {
    grid-column: 3;
    text-align: right;
  }

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

@media (min-width: 960px) {
  .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
  }

  .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .about-split--reverse {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .about-chapter__head {
    grid-template-columns: 9rem minmax(0, 1fr);
    align-items: end;
    gap: 0 1.6rem;
  }

  .about-chapter__num {
    font-size: clamp(3.4rem, 6vw, 5.4rem);
  }

  .about-reach {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: center;
  }

  .about-cta__actions {
    justify-content: flex-end;
  }

  .about-timeline {
    padding-left: 2.6rem;
  }

  .about-timeline__dot {
    left: -2.18rem;
  }
}

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