.page-about {
  --about-gap: clamp(20px, 4vw, 44px);
  --about-num: clamp(46px, 8vw, 104px);
}

/* ── 首屏 ───────────────────────────── */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(22px, 4vw, 48px) clamp(26px, 5vw, 60px);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -22%;
  right: -12%;
  width: clamp(300px, 52vw, 720px);
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(47, 123, 255, 0.22), transparent 62%);
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}
.page-about .about-hero__lead .breadcrumbs {
  margin-bottom: clamp(14px, 2vw, 22px);
}
.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 5.4vw, 66px);
  line-height: 1.04;
  letter-spacing: 0.04em;
  color: var(--paper);
  margin: 0.34em 0 0.42em;
}
.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 0;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--mist);
}
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(20px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .about-facts li {
  background: var(--ink-1);
  padding: 14px 16px;
}
.page-about .about-facts__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.1;
  color: var(--cyan);
}
.page-about .about-facts li:nth-child(2) .about-facts__num { color: var(--gold); }
.page-about .about-facts li:nth-child(3) .about-facts__num { color: var(--paper); }
.page-about .about-facts li:nth-child(4) .about-facts__num { color: var(--blue); }
.page-about .about-facts__lbl {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--ink-2);
}
.page-about .about-hero__media::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(7, 9, 12, 0.78));
  pointer-events: none;
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}
.page-about .about-hero__media figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* ── 章节索引 ───────────────────────── */
.page-about .about-index {
  position: sticky;
  top: var(--bar-h);
  z-index: 10;
  background: rgba(7, 9, 12, 0.94);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .about-index__list {
  display: flex;
  gap: clamp(14px, 2.4vw, 30px);
  margin: 0;
  padding: 12px var(--gutter);
  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: baseline;
  gap: 7px;
  white-space: nowrap;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--blue);
}
.page-about .about-index__num { color: var(--gold); }

/* ── 章节骨架 ───────────────────────── */
.page-about .about-body { padding-bottom: clamp(36px, 6vw, 84px); }
.page-about .chapter {
  display: grid;
  gap: 10px;
  padding-block: clamp(28px, 4.5vw, 58px);
  border-top: 1px solid var(--line);
}
.page-about .chapter:first-child { border-top: 0; }
.page-about .chapter__num {
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: var(--about-num);
  line-height: 0.8;
  letter-spacing: 0.02em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(168, 178, 188, 0.5);
}
@supports not ((-webkit-text-stroke: 1px #000)) {
  .page-about .chapter__num { color: var(--rock); }
}
.page-about .chapter__head h2 {
  margin: 0 0 0.55em;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.14;
  letter-spacing: 0.05em;
  color: var(--paper);
}
.page-about .chapter__body p {
  max-width: 70ch;
  margin: 0 0 1em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .chapter__body p:last-child { margin-bottom: 0; }
.page-about .chapter__body a:not(.btn):not(.next__link) {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 245, 224, 0.35);
}
.page-about .chapter__body a:not(.btn):not(.next__link):hover {
  border-bottom-color: var(--cyan);
}

/* ── 版本刻度 ───────────────────────── */
.page-about .version-track {
  margin: 22px 0 26px;
  padding: 0;
  list-style: none;
}
.page-about .version-track__item {
  position: relative;
  padding: 0 0 26px 24px;
  border-left: 1px solid var(--line-strong);
}
.page-about .version-track__item:last-child { padding-bottom: 4px; }
.page-about .version-track__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--ink-0);
  border: 1px solid var(--blue);
}
.page-about .version-track__item.is-current::before {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(255, 178, 74, 0.16);
}
.page-about .version-track__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
  margin-bottom: 6px;
}
.page-about .version-track__item.is-current .version-track__tag { color: var(--gold); }
.page-about .version-track h3 {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper);
}
.page-about .version-track p {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ── 三级校验流程 ───────────────────── */
.page-about .flow {
  display: grid;
  gap: 14px;
  margin: 22px 0 26px;
  padding: 0;
  list-style: none;
}
.page-about .flow__step {
  position: relative;
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(36, 44, 51, 0.55), rgba(12, 16, 20, 0.85));
}
.page-about .flow__step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 16px;
  height: 16px;
  border-top: 1px solid var(--cyan);
  border-left: 1px solid var(--cyan);
}
.page-about .flow__step:nth-child(2)::before { border-color: var(--blue); }
.page-about .flow__step:nth-child(3)::before { border-color: var(--gold); }
.page-about .flow__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
  margin-bottom: 10px;
}
.page-about .flow__step:nth-child(2) .flow__n { color: var(--blue); }
.page-about .flow__step:nth-child(3) .flow__n { color: var(--gold); }
.page-about .flow__step h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.08em;
  color: var(--paper);
}
.page-about .flow__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ── 插图 ───────────────────────────── */
.page-about .about-figure {
  position: relative;
  margin: 26px 0 0;
  border: 1px solid var(--line-strong);
  background: var(--ink-1);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.94) contrast(1.05);
}
.page-about .about-figure figcaption {
  padding: 11px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
}

/* ── 团队分工 ───────────────────────── */
.page-about .team {
  display: grid;
  gap: 18px;
  margin: 22px 0 24px;
  padding: 0;
  list-style: none;
}
.page-about .team__item {
  padding-top: 14px;
  border-top: 1px solid var(--line-strong);
}
.page-about .team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.2vw, 44px);
  line-height: 1;
  color: var(--gold);
}
.page-about .team__item:nth-child(2) .team__num { color: var(--blue); }
.page-about .team__item:nth-child(3) .team__num { color: var(--moss); }
.page-about .team__role {
  display: block;
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.1em;
  color: var(--paper);
}
.page-about .team__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ── 合作方式 ───────────────────────── */
.page-about .coop {
  display: grid;
  gap: 12px;
  margin: 22px 0 22px;
  padding: 0;
  list-style: none;
}
.page-about .coop__item {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--clay);
  background: rgba(36, 44, 51, 0.32);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .coop__item:hover {
  border-left-color: var(--gold);
  background: rgba(36, 44, 51, 0.6);
}
.page-about .coop__item h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.08em;
  color: var(--paper);
}
.page-about .coop__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

/* ── 下一步入口 ─────────────────────── */
.page-about .next {
  display: grid;
  gap: 12px;
  margin: 22px 0 20px;
}
.page-about .next__link {
  display: block;
  padding: 20px 20px 18px;
  border: 1px solid var(--line-strong);
  background: linear-gradient(140deg, rgba(47, 123, 255, 0.14), rgba(7, 9, 12, 0.4) 62%);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.page-about .next__link:hover,
.page-about .next__link:focus-visible {
  border-color: var(--blue);
  transform: translateY(-2px);
}
.page-about .next__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-bottom: 8px;
}
.page-about .next__title {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.24;
  letter-spacing: 0.04em;
  color: var(--paper);
}
.page-about .next__go {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--gold);
}
.page-about .about-tail {
  margin-top: 4px !important;
  font-family: var(--font-mono);
  font-size: 12.5px !important;
  line-height: 1.8 !important;
  color: rgba(168, 178, 188, 0.78) !important;
}

/* ── 响应式 ─────────────────────────── */
@media (min-width: 760px) {
  .page-about .flow { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .coop { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .team { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
  .page-about .next { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .about-facts { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) clamp(220px, 26vw, 296px);
  }
  .page-about .chapter {
    grid-template-columns: clamp(92px, 12vw, 148px) minmax(0, 1fr);
    column-gap: clamp(20px, 3.5vw, 52px);
  }
  .page-about .chapter__num { padding-top: 4px; }
}

@media (min-width: 1024px) {
  .page-about .about-index { top: 0; }
  .page-about .about-index__list { padding-inline: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .coop__item,
  .page-about .next__link {
    transition: none;
  }
  .page-about .next__link:hover,
  .page-about .next__link:focus-visible { transform: none; }
}
<<<END>>>