.page-about {
  --about-rail: 288px;
  --about-note-surface: color-mix(in srgb, var(--color-surface-alt) 86%, transparent);
  --about-note-edge: color-mix(in srgb, var(--color-primary) 26%, transparent);
  --about-chapter-gap: var(--space-8);
  position: relative;
  isolation: isolate;
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: min(900px, 118vh);
  background:
    radial-gradient(52% 38% at 6% 0%, color-mix(in srgb, var(--color-primary) 22%, transparent), transparent 72%),
    radial-gradient(46% 32% at 98% 16%, color-mix(in srgb, var(--color-accent) 18%, transparent), transparent 74%),
    radial-gradient(40% 26% at 52% 46%, color-mix(in srgb, var(--color-highlight) 62%, transparent), transparent 78%);
  pointer-events: none;
  z-index: -1;
}

/* ---------- 面包屑 ---------- */
.page-about .page-about__crumbs {
  padding-top: var(--space-6);
}

/* ---------- 开篇 ---------- */
.page-about .about-hero {
  padding-block: var(--space-4) var(--space-8);
}

.page-about .about-hero__grid {
  display: grid;
  gap: var(--space-6);
}

.page-about .about-hero__lede h1 {
  margin: var(--space-2) 0 0;
  max-width: 19ch;
  font-family: var(--font-heading);
  font-size: clamp(var(--text-3xl), 5.4vw, var(--text-4xl));
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-about .about-hero__lead {
  margin-top: var(--space-3);
  max-width: 54ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-about .about-hero__actions {
  margin-top: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-about .about-figures {
  padding: var(--space-4) var(--space-3);
  display: grid;
  align-content: start;
  gap: var(--space-3);
}

.page-about .about-figures__eyebrow {
  color: var(--color-contrast-accent);
}

.page-about .about-figures__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3) var(--space-2);
}

.page-about .about-figures__list .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
}

.page-about .about-figures__list .stat__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-contrast-ink);
  opacity: 0.76;
}

/* ---------- 叙事主体 ---------- */
.page-about .about-story {
  padding-block: var(--space-6) var(--section-y);
}

.page-about .about-story__figure {
  margin: 0 0 var(--about-chapter-gap);
}

.page-about .about-story__figure--mid {
  margin: var(--about-chapter-gap) 0;
}

.page-about .about-chapter {
  display: grid;
  gap: var(--space-3);
}

.page-about .about-chapter + .about-chapter {
  position: relative;
  margin-top: var(--about-chapter-gap);
  padding-top: var(--about-chapter-gap);
}

.page-about .about-chapter + .about-chapter::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: var(--border-thin);
  background: linear-gradient(
    90deg,
    var(--color-accent) 0,
    var(--color-accent) 76px,
    var(--color-line) 76px,
    var(--color-line) 100%
  );
}

.page-about .about-chapter__kicker {
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.26em;
  text-transform: uppercase;
}

.page-about .about-chapter h2 {
  margin: var(--space-2) 0 0;
  max-width: 22ch;
  font-family: var(--font-heading);
  font-size: clamp(var(--text-xl), 3.4vw, var(--text-2xl));
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-about .about-chapter__body h2 + p,
.page-about .about-chapter__body p + p {
  margin-top: var(--space-3);
}

.page-about .about-chapter__body > p {
  max-width: var(--measure);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-about .about-chapter__body > p a,
.page-about .about-outro__next a {
  color: var(--color-primary);
  text-decoration-line: underline;
  text-decoration-thickness: var(--border-thin);
  text-underline-offset: 4px;
}

.page-about .about-chapter__body > p a:hover,
.page-about .about-outro__next a:hover {
  color: var(--color-accent);
}

/* ---------- 旁注带 ---------- */
.page-about .about-chapter__note {
  align-self: start;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--about-note-edge);
  border-radius: var(--radius-md);
  background: var(--about-note-surface);
  box-shadow:
    var(--shadow-1),
    inset 0 1px 0 color-mix(in srgb, var(--color-surface) 82%, transparent);
  backdrop-filter: blur(9px);
  -webkit-backdrop-filter: blur(9px);
}

.page-about .about-note__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.page-about .about-note__list {
  list-style: none;
  margin: var(--space-2) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-about .about-note__list li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-ink-soft);
}

.page-about .about-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 10px;
  height: var(--border-thin);
  background: var(--color-accent);
}

.page-about .about-note__figure {
  margin: var(--space-3) 0 0;
}

/* ---------- 取舍原则 ---------- */
.page-about .about-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-about .about-principle {
  padding-left: var(--space-3);
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-about .about-principle__index {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-accent);
}

.page-about .about-principle h3 {
  margin: var(--space-1) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-about .about-principle p {
  margin-top: var(--space-2);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 收尾出口 ---------- */
.page-about .about-outro {
  margin-top: var(--about-chapter-gap);
  padding: var(--space-6) var(--space-3);
  display: grid;
  gap: var(--space-4);
}

.page-about .about-outro__text h2 {
  margin: var(--space-2) 0 0;
  max-width: 22ch;
  font-family: var(--font-heading);
  font-size: clamp(var(--text-xl), 3.4vw, var(--text-2xl));
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-about .about-outro__text p {
  margin-top: var(--space-3);
  max-width: 52ch;
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-about .about-outro__channels {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about .about-outro__channels li {
  display: grid;
  gap: var(--space-1);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-about .about-outro__channels li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-outro__key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.page-about .about-outro__value {
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-ink);
  overflow-wrap: anywhere;
}

.page-about .about-outro__next {
  max-width: 56ch;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-outro {
    padding: var(--space-8) var(--space-6);
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    grid-template-areas:
      "text channels"
      "next channels";
    gap: var(--space-4) var(--space-6);
    align-items: start;
  }

  .page-about .about-outro__text {
    grid-area: text;
  }

  .page-about .about-outro__channels {
    grid-area: channels;
  }

  .page-about .about-outro__next {
    grid-area: next;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-rail: 300px;
  }

  .page-about .about-hero {
    padding-block: var(--space-8) var(--space-8);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(288px, 364px);
    align-items: end;
    gap: var(--space-8);
  }

  .page-about .about-chapter {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    gap: var(--space-6) var(--space-8);
    align-items: start;
  }

  .page-about .about-chapter + .about-chapter::before {
    right: 22%;
  }

  .page-about .about-outro {
    margin-top: var(--section-y);
  }
}

@media (min-width: 1140px) {
  .page-about {
    --about-rail: 320px;
    --about-chapter-gap: var(--space-8);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 388px;
  }
}

.page-about .about-hero__lede h1,
.page-about .about-chapter h2,
.page-about .about-principle h3,
.page-about .about-outro__text h2 {
  text-wrap: balance;
}
<<<END>>>