.page-about {
  --about-rail: 148px;
  --about-soft: rgba(244, 241, 232, 0.82);
  padding-bottom: clamp(3rem, 8vw, 6rem);
  color: var(--cream);
  background:
    radial-gradient(1100px 520px at 88% -6%, rgba(53, 224, 208, 0.1), transparent 62%),
    radial-gradient(760px 420px at 4% 34%, rgba(18, 63, 74, 0.5), transparent 68%),
    var(--ink);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  padding-block: clamp(0.8rem, 2vw, 1.25rem) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.2rem, 3vw, 2.2rem) clamp(1.6rem, 4vw, 2.6rem);
}

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

.page-about .about-hero__title {
  margin: 0.5rem 0 0;
  font-size: clamp(2rem, 6.2vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.page-about .about-hero__text {
  margin: 1.1rem 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 2.3vw, 1.1rem);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.page-about .about-hero__visual {
  position: relative;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.06);
}

.page-about .about-hero__stamp {
  position: absolute;
  right: 10px;
  bottom: -14px;
  padding: 0.4rem 0.7rem;
  border: 2px solid var(--ink);
  background: var(--amber);
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(0.78rem, 2vw, 0.95rem);
  letter-spacing: 0.06em;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.45);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin-top: clamp(2rem, 5vw, 3rem);
  border: 2px solid var(--line);
  background: var(--line);
}

.page-about .about-stats__item {
  padding: 0.85rem 1rem;
  background: var(--panel);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.3rem, 3.2vw, 1.8rem);
  line-height: 1.1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .about-stats__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--sage);
}

/* ---------- 章节索引 ---------- */
.page-about .about-toc {
  border-block: 2px solid var(--line);
  background: var(--panel);
}

.page-about .about-toc__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0.8rem 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.42rem 0.7rem;
  border: 2px solid var(--line);
  color: var(--mist);
  font-size: 0.86rem;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--amber);
  transition: color 0.18s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  border-color: var(--cyan);
  background: var(--cyan);
  color: var(--ink);
}

.page-about .about-toc__link:hover .about-toc__num,
.page-about .about-toc__link:focus-visible .about-toc__num {
  color: var(--ink);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  display: grid;
  gap: clamp(0.75rem, 2vw, 2rem);
  padding-block: clamp(2.25rem, 6vw, 4.5rem);
  border-top: 2px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .chapter__rail {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.2rem, 7vw, 4.6rem);
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--line-soft);
}

@supports not (-webkit-text-stroke: 1px black) {
  .page-about .chapter__num {
    color: rgba(53, 224, 208, 0.24);
  }
}

.page-about .chapter__side {
  display: none;
}

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

.page-about .chapter__title {
  margin: 0.4rem 0 0;
  max-width: 20em;
  font-size: clamp(1.4rem, 3.4vw, 2.25rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-about .chapter__lede {
  margin: 1rem 0 0;
  max-width: 33em;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .chapter__text {
  margin: 1rem 0 0;
  max-width: 36em;
  font-size: 0.98rem;
  line-height: 1.82;
  color: var(--about-soft);
}

.page-about .chapter__text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .chapter__text a:hover,
.page-about .chapter__text a:focus-visible {
  color: var(--cream);
}

.page-about .chapter__split {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.25rem;
}

/* ---------- 引用块 ---------- */
.page-about .pull-quote {
  margin: 1.5rem 0 0;
  padding: clamp(1rem, 2.6vw, 1.6rem);
  border: 2px solid var(--cyan);
  border-left-width: 8px;
  background: var(--panel-2);
  box-shadow: var(--shadow-cyan);
  font-size: clamp(1rem, 2.2vw, 1.22rem);
  font-weight: 700;
  line-height: 1.6;
  color: var(--cream);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

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

.page-about .about-figure--slant img {
  clip-path: polygon(0 0, 100% 0, 100% 91%, 0 100%);
}

.page-about .about-figure figcaption {
  padding: 0.6rem 0.8rem;
  border-top: 2px solid var(--line);
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--sage);
}

/* ---------- 版本演进 ---------- */
.page-about .versions-layout {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.page-about .versions {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .versions::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 78%);
}

.page-about .versions__item {
  position: relative;
  padding-left: 2.6rem;
  padding-block: 0.7rem;
}

.page-about .versions__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 1.05rem;
  width: 18px;
  height: 18px;
  border: 2px solid var(--line-soft);
  background: var(--ink);
}

.page-about .versions__item--current::before {
  border-color: var(--amber);
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 178, 62, 0.16);
}

.page-about .versions__ver {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .versions__title {
  margin: 0.3rem 0 0.4rem;
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1.35;
}

.page-about .versions__text {
  margin: 0;
  max-width: 32em;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--about-soft);
}

.page-about .version-chart {
  display: block;
  width: 100%;
  max-width: 620px;
  height: auto;
  margin-top: 1.5rem;
  padding: 0.6rem;
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-about .version-chart__grid {
  stroke: var(--line-soft);
  stroke-width: 1;
}

.page-about .version-chart__line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 3;
  stroke-linecap: square;
}

.page-about .version-chart__dot {
  fill: var(--amber);
}

.page-about .version-chart__label {
  fill: var(--sage);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
}

.page-about .note-line {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  margin: 1.2rem 0 0;
  padding-top: 0.8rem;
  border-top: 1px dashed var(--line-soft);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--sage);
}

/* ---------- 生产流程 ---------- */
.page-about .flow {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__item {
  padding: 1rem 1.05rem;
  border: 2px solid var(--line);
  background: var(--panel);
}

.page-about .flow__step {
  display: inline-block;
  padding: 0.1rem 0.42rem;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.76rem;
}

.page-about .flow__title {
  margin: 0.65rem 0 0.4rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--cream);
}

.page-about .flow__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--about-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.page-about .team-filter__n {
  margin-left: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--sage);
}

.page-about .team-count {
  margin: 0.7rem 0 0;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--sage);
}

.page-about .team-count .filter-count {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--amber);
}

.page-about .team-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1.05rem 1.1rem;
}

.page-about .team-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}

.page-about .team-card__size {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--amber);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--about-soft);
}

/* ---------- 覆盖范围表格 ---------- */
.page-about .table-scroll {
  margin-top: 1.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .table-scroll .data-table {
  width: 100%;
  min-width: 580px;
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  position: relative;
  display: grid;
  gap: 1.1rem;
  margin-top: clamp(2rem, 6vw, 4rem);
  padding: clamp(1.4rem, 4vw, 2.6rem);
  border: 2px solid var(--cyan);
  background: var(--grad-deep);
  box-shadow: var(--shadow-cyan);
  overflow: hidden;
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(53, 224, 208, 0.09) 0 1px, transparent 1px 15px);
  pointer-events: none;
}

.page-about .about-cta__title {
  position: relative;
  margin: 0;
  font-size: clamp(1.3rem, 3.2vw, 2rem);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-cta__text {
  position: relative;
  margin: 0.8rem 0 0;
  max-width: 32em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .chapter__rail {
    flex-direction: column;
    gap: 0.75rem;
  }

  .page-about .chapter__side {
    display: block;
    padding-left: 0.55rem;
    border-left: 2px solid var(--line);
    writing-mode: vertical-rl;
    letter-spacing: 0.32em;
    font-size: 0.7rem;
    color: var(--sage);
  }

  .page-about .chapter__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: start;
    gap: 1.75rem;
  }

  .page-about .versions-layout {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: start;
    gap: 2rem;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

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

@media (min-width: 1180px) {
  .page-about {
    --about-rail: 176px;
  }

  .page-about .chapter__split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.7fr);
  }
}

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