.page-about {
  --about-toc: 12rem;
}

.page-about .about-cover {
  padding-block: 1.25rem 3rem;
}

.page-about .about-cover__grid {
  display: grid;
  gap: 2.25rem;
}

.page-about .about-cover__lead h1 {
  font-size: clamp(2rem, 6.4vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin-block: 0.65rem 1.1rem;
}

.page-about .about-cover__lead .lede {
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.8;
  color: var(--fog-200);
}

.page-about .about-cover__note {
  max-width: 56ch;
  margin-top: 1rem;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--fog-quiet);
}

.page-about .about-cover__note--tight {
  margin-top: 0;
  max-width: 58ch;
}

.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .cover-facts {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background:
    radial-gradient(circle at 88% 0%, rgba(37, 224, 208, 0.13), transparent 62%),
    linear-gradient(160deg, rgba(21, 37, 71, 0.94), rgba(12, 23, 48, 0.74));
  padding: 1.1rem 1.3rem;
  box-shadow: var(--shadow-card);
}

.page-about .cover-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.78rem 0;
  border-bottom: 1px dashed var(--line-grid);
}

.page-about .cover-fact:last-child {
  border-bottom: 0;
  padding-bottom: 0.15rem;
}

.page-about .cover-fact:first-child {
  padding-top: 0.15rem;
}

.page-about .cover-fact__label {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--fog-200);
}

.page-about .cover-fact__num {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--cyan-400);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.page-about .about-body {
  display: grid;
  gap: 1.5rem;
  padding-block: 1rem 4rem;
}

.page-about .about-toc {
  order: -1;
}

.page-about .about-toc__title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel-500);
  margin-bottom: 0.6rem;
}

.page-about .about-toc ol {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scrollbar-width: thin;
}

.page-about .about-toc a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-soft);
  color: var(--fog-200);
  font-size: 0.84rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-toc a .mono {
  color: var(--cyan-400);
  font-size: 0.74rem;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--snow-050);
  border-color: var(--cyan-400);
  background: var(--ink-700);
}

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

.page-about .about-chapter {
  position: relative;
  padding-block: 2.25rem;
  border-top: 1px solid var(--line-grid);
  scroll-margin-top: calc(var(--topbar-h) + 1.5rem);
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0.5rem;
}

.page-about .about-chapter__head {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 1.4rem;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.1rem, 7vw, 3.1rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(37, 224, 208, 0.85);
  letter-spacing: -0.03em;
}

@supports not (-webkit-text-stroke: 1px #25E0D0) {
  .page-about .about-chapter__num {
    color: rgba(37, 224, 208, 0.35);
  }
}

.page-about .about-chapter__head h2 {
  font-size: clamp(1.4rem, 3.4vw, 2.05rem);
  line-height: 1.24;
  letter-spacing: -0.015em;
  font-weight: 700;
  max-width: 24ch;
}

.page-about .prose {
  max-width: 64ch;
  color: var(--fog-200);
  line-height: 1.82;
}

.page-about .prose p + p {
  margin-top: 0.95rem;
}

.page-about .about-chapter__tail {
  max-width: 64ch;
  margin-top: 1.6rem;
  padding-top: 1.1rem;
  border-top: 1px dashed var(--line-grid);
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--fog-quiet);
}

/* 团队 */
.page-about .team-layout {
  display: grid;
  gap: 1.6rem;
}

.page-about .team-cards {
  display: grid;
  gap: 0.95rem;
}

.page-about .team-card {
  position: relative;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-l);
  background: linear-gradient(165deg, rgba(21, 37, 71, 0.9), rgba(12, 23, 48, 0.86));
  padding: 1.35rem 1.4rem 1.4rem;
  padding-left: 1.55rem;
  overflow: hidden;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.15rem;
  bottom: 1.15rem;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--cyan-400), rgba(37, 224, 208, 0));
}

.page-about .team-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan-400);
}

.page-about .team-card__tag {
  display: inline-block;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--steel-500);
  margin-bottom: 0.55rem;
}

.page-about .team-card h3 {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--snow-050);
  margin-bottom: 0.45rem;
}

.page-about .team-card p {
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--fog-200);
}

.page-about .team-figure {
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink-700);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 4;
}

.page-about .team-figure figcaption {
  padding: 0.8rem 1rem 0.95rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--fog-quiet);
  border-top: 1px solid var(--line-grid);
}

/* 流程 */
.page-about .flow {
  margin-top: 1.6rem;
  padding: 1.1rem 0.9rem 0.9rem;
  border: 1px solid var(--line-grid);
  border-radius: var(--radius-l);
  background:
    linear-gradient(180deg, rgba(12, 23, 48, 0.9), rgba(6, 13, 30, 0.9)),
    repeating-linear-gradient(90deg, var(--line-grid) 0 1px, transparent 1px 40px);
}

.page-about .flow__svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .flow__link {
  stroke: var(--steel-500);
  stroke-width: 1.2;
  stroke-dasharray: 5 4;
  transition: stroke 0.2s var(--ease);
}

.page-about .flow__node rect {
  fill: var(--ink-700);
  stroke: var(--line-soft);
  stroke-width: 1;
  transition: fill 0.2s var(--ease), stroke 0.2s var(--ease);
}

.page-about .flow__node text {
  fill: var(--snow-050);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.page-about .flow__node:hover rect {
  fill: var(--ink-600);
  stroke: var(--cyan-400);
}

.page-about .flow:hover .flow__link {
  stroke: var(--cyan-400);
}

.page-about .flow figcaption {
  margin-top: 0.85rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--fog-quiet);
  text-align: center;
}

.page-about .flow-notes {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.5rem;
}

.page-about .flow-note {
  border-left: 2px solid rgba(37, 224, 208, 0.55);
  padding: 0.15rem 0 0.15rem 1rem;
}

.page-about .flow-note h3 {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--snow-050);
  margin-bottom: 0.3rem;
}

.page-about .flow-note p {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--fog-200);
  max-width: 50ch;
}

/* 时间轴 */
.page-about .milestone-banner {
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line-grid);
  margin-bottom: 1.8rem;
}

.page-about .milestone-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 7;
}

.page-about .timeline {
  position: relative;
  padding-left: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 1.4rem;
  bottom: 1.4rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-400), rgba(37, 224, 208, 0.12));
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 0 0.9rem 2.4rem;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.35rem;
  width: 15px;
  height: 15px;
  border-radius: 6px;
  background: var(--ink-900);
  border: 2px solid var(--cyan-400);
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .timeline__item:hover::before {
  background: var(--cyan-400);
  transform: scale(1.1);
}

.page-about .timeline__year {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan-400);
}

.page-about .timeline__body h3 {
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--snow-050);
  margin-bottom: 0.3rem;
}

.page-about .timeline__body p {
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--fog-200);
  max-width: 56ch;
}

/* 合作 */
.page-about .about-chapter--partners {
  border-radius: var(--radius-l);
  border-top: 0;
  margin-block: 1.5rem;
  overflow: hidden;
  isolation: isolate;
  background: linear-gradient(155deg, var(--ink-800), var(--ink-900));
  border: 1px solid var(--line-soft);
}

.page-about .about-chapter__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  z-index: -1;
  filter: saturate(0.8);
}

.page-about .about-chapter__inner {
  padding: 2rem 1.35rem 2.2rem;
}

.page-about .partner-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.4rem;
}

/* 收尾 */
.page-about .about-chapter--start {
  border-top: 1px solid var(--line-grid);
}

.page-about .start-cards {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.6rem;
}

.page-about .start-card {
  display: block;
  position: relative;
  padding: 1.3rem 1.35rem 1.2rem;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-soft);
  background: rgba(21, 37, 71, 0.55);
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .start-card:hover,
.page-about .start-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--cyan-400);
  background: var(--ink-700);
}

.page-about .start-card__index {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
  margin-bottom: 0.6rem;
}

.page-about .start-card h3 {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--snow-050);
  margin-bottom: 0.4rem;
}

.page-about .start-card p {
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--fog-200);
  margin-bottom: 0.8rem;
  word-break: break-word;
}

.page-about .start-card__go {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--cyan-200);
  border-bottom: 1px solid rgba(37, 224, 208, 0.45);
  padding-bottom: 2px;
}

@media (min-width: 600px) {
  .page-about .flow-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.4rem;
  }

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

  .page-about .timeline__item {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    column-gap: 1rem;
    padding-left: 2.6rem;
  }

  .page-about .timeline__year {
    padding-top: 0.1rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    align-items: end;
    gap: 3rem;
  }

  .page-about .about-chapter__head {
    grid-template-columns: 4.5rem minmax(0, 1fr);
    column-gap: 1.15rem;
    align-items: center;
  }

  .page-about .about-chapter__num {
    text-align: right;
  }

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

  .page-about .about-chapter__inner {
    padding: 2.4rem 2.2rem 2.6rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-toc) minmax(0, 1fr);
    column-gap: 3rem;
    align-items: start;
    padding-block: 1.5rem 5rem;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--topbar-h) + 1.75rem);
  }

  .page-about .about-toc ol {
    display: grid;
    gap: 0.1rem;
    overflow: visible;
  }

  .page-about .about-toc a {
    display: flex;
    white-space: normal;
    border-color: transparent;
    border-radius: var(--radius-s);
    padding: 0.45rem 0.6rem;
    font-size: 0.82rem;
    line-height: 1.4;
  }
}

@media (min-width: 1200px) {
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    column-gap: 1.6rem;
    align-items: start;
  }

  .page-about .team-card {
    padding: 1.45rem 1.5rem 1.5rem 1.65rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .start-card,
  .page-about .timeline__item::before {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .start-card:hover,
  .page-about .start-card:focus-visible {
    transform: none;
  }

  .page-about .timeline__item:hover::before {
    transform: none;
  }
}
<<<END>>>