.page-about {
  --about-grid-line: rgba(201, 191, 176, 0.35);
  --about-cream-line: rgba(251, 246, 238, 0.16);
  --about-serif: var(--font-serif);
  background-color: var(--paper-50);
  background-image:
    repeating-linear-gradient(0deg, var(--about-grid-line) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(90deg, var(--about-grid-line) 0 1px, transparent 1px 24px);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.75;
}

.page-about .about-shell {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about a:focus-visible,
.page-about .btn:focus-visible {
  outline: 2px solid var(--apricot-500);
  outline-offset: 3px;
}

.page-about .breadcrumb {
  padding-block: clamp(14px, 2vw, 22px) 0;
  font-size: var(--fs-12);
}

/* ---------- 首屏分屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(20px, 3vw, 34px) clamp(32px, 5vw, 64px);
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 4.6vw, 3.3rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  margin: 10px 0 16px;
  max-width: 13em;
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: 34em;
  font-size: var(--fs-16);
  color: var(--text);
}

.page-about .about-hero__plate {
  position: relative;
  background: var(--ink-900);
  color: var(--paper-50);
  border-left: 6px solid var(--apricot-500);
  padding: clamp(22px, 3vw, 34px);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 92%);
}

.page-about .about-hero__plate-label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--apricot-200);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-stats__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-block: 12px;
  border-bottom: 1px solid var(--about-cream-line);
}

.page-about .about-stats__row:last-child {
  border-bottom: 0;
  padding-bottom: 4px;
}

.page-about .about-stats__num {
  flex: none;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  line-height: 1.1;
  color: var(--apricot-200);
  letter-spacing: -0.01em;
}

.page-about .about-stats__label {
  font-size: var(--fs-14);
  line-height: 1.5;
  color: rgba(251, 246, 238, 0.76);
  text-align: right;
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding-top: clamp(20px, 3vw, 36px);
  border-top: 1px solid var(--rule);
}

.page-about .about-rail {
  align-self: start;
  background: var(--paper-100);
  border: 1px solid var(--rule);
  padding: clamp(16px, 2.4vw, 24px);
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--amber-700);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--rule);
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__link {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 9px 6px 9px 0;
  text-decoration: none;
  color: var(--text);
}

.page-about .about-timeline__node {
  width: 12px;
  height: 12px;
  margin-top: 5px;
  background: var(--paper-50);
  border: 1px solid var(--ink-700);
  position: relative;
  z-index: 1;
  transition: background-color 180ms ease-out, border-color 180ms ease-out;
}

.page-about .about-timeline__link:hover .about-timeline__node,
.page-about .about-timeline__link:focus-visible .about-timeline__node {
  background: var(--apricot-500);
  border-color: var(--apricot-500);
}

.page-about .about-timeline__link:hover .about-timeline__label {
  color: var(--ink-900);
  border-bottom-color: var(--apricot-500);
}

.page-about .about-timeline__text {
  display: block;
  min-width: 0;
}

.page-about .about-timeline__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--apricot-500);
  line-height: 1.3;
}

.page-about .about-timeline__label {
  display: inline-block;
  font-family: var(--about-serif);
  font-size: var(--fs-16);
  font-weight: 600;
  line-height: 1.45;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease-out, border-color 180ms ease-out;
}

.page-about .about-rail__ticks {
  display: block;
  width: 100%;
  height: 20px;
  margin-top: 18px;
  color: var(--rule);
}

.page-about .about-rail__note {
  margin: 10px 0 0;
  font-size: var(--fs-12);
  font-style: italic;
  color: var(--ink-700);
  border-bottom: 1px solid var(--amber-400);
  display: inline-block;
  padding-bottom: 2px;
}

/* ---------- 章节流 ---------- */
.page-about .about-stream {
  min-width: 0;
}

.page-about .about-chap {
  padding-block: clamp(26px, 4vw, 48px);
  border-top: 1px solid var(--rule);
  scroll-margin-top: calc(var(--top-h) + var(--rail-h) + 24px);
}

.page-about .about-chap:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chap__head {
  display: flex;
  align-items: flex-start;
  gap: clamp(10px, 2vw, 20px);
  margin-bottom: clamp(14px, 2.4vw, 24px);
}

.page-about .about-chap__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4.4vw, 3rem);
  line-height: 0.9;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--apricot-200);
}

.page-about .about-chap__title {
  margin: 0;
  font-family: var(--about-serif);
  font-size: clamp(1.3rem, 2.4vw, 1.85rem);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-about .about-text {
  max-width: 37em;
}

.page-about .about-text p {
  margin: 0;
  font-size: var(--fs-16);
}

.page-about .about-text p + p {
  margin-top: 0.9em;
}

/* ---------- 阶段列表 ---------- */
.page-about .about-phases {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
}

.page-about .about-phases__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding-block: 15px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-phases__item:first-child {
  border-top: 1px solid var(--rule);
}

.page-about .about-phases__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  font-variant-numeric: tabular-nums;
  color: var(--amber-700);
  letter-spacing: 0.06em;
  padding-top: 4px;
}

.page-about .about-phases__title {
  margin: 0 0 4px;
  font-family: var(--about-serif);
  font-size: var(--fs-20);
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .about-phases__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--text);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(20px, 3vw, 32px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  background: var(--paper-100);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  display: inline-block;
  margin-top: 8px;
  padding-bottom: 2px;
  font-size: var(--fs-12);
  font-style: italic;
  color: var(--ink-700);
  border-bottom: 1px solid var(--amber-400);
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 7;
}

.page-about .about-figure--side img {
  aspect-ratio: 3 / 2;
}

/* ---------- 引文 ---------- */
.page-about .about-quote {
  margin: clamp(26px, 4vw, 44px) 0;
  background: var(--ink-900);
  color: var(--paper-50);
  border-left: 8px solid var(--apricot-500);
  padding: clamp(24px, 4vw, 46px);
  font-family: var(--about-serif);
  font-size: clamp(1.15rem, 2.3vw, 1.65rem);
  line-height: 1.55;
  letter-spacing: 0.01em;
}

.page-about .about-quote p {
  margin: 0;
}

.page-about .about-quote cite {
  display: block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--apricot-200);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(16px, 2.6vw, 26px) 0 0;
  padding: 0;
  counter-reset: about-flow;
}

.page-about .about-flow__step {
  position: relative;
  padding: 14px 0 14px 18px;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-flow__step:first-child {
  border-top: 1px solid var(--rule);
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 8px;
  height: 8px;
  background: var(--apricot-500);
}

.page-about .about-flow__title {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: var(--fs-16);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-flow__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
}

.page-about .about-flow + .about-text {
  margin-top: clamp(16px, 2.4vw, 24px);
}

/* ---------- 读者场景 ---------- */
.page-about .about-scenes {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-scene {
  background: var(--paper-100);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--amber-400);
  padding: 16px 18px;
}

.page-about .about-scene__tag {
  display: inline-block;
  margin: 0 0 8px;
  padding: 2px 8px;
  background: var(--amber-700);
  color: var(--paper-50);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
}

.page-about .about-scene__title {
  margin: 0 0 6px;
  font-family: var(--about-serif);
  font-size: var(--fs-20);
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .about-scene__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.7;
}

.page-about .about-scenes + .about-text {
  margin-top: clamp(16px, 2.4vw, 24px);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(24px, 3.4vw, 40px);
  background: var(--paper-100);
  border: 1px solid var(--rule);
  border-top: 4px solid var(--apricot-500);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--about-serif);
  font-size: clamp(1.25rem, 2.2vw, 1.6rem);
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .about-cta__desc {
  margin: 0 0 20px;
  max-width: 37em;
  font-size: var(--fs-16);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: stretch;
  }

  .page-about .about-hero__plate {
    align-self: start;
  }

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

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: minmax(230px, 38%) minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 68px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--top-h) + var(--rail-h) + 20px);
  }
}

@media (min-width: 1280px) {
  .page-about .about-body {
    grid-template-columns: minmax(260px, 34%) minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__node,
  .page-about .about-timeline__label {
    transition: none;
  }
}

以上是本次输出的全部内容。