.page-about {
  --about-index-w: 200px;
  --about-index-gap: 56px;
  --about-rule: rgba(20, 32, 28, 0.14);
  --about-rule-strong: rgba(20, 32, 28, 0.30);
  background: var(--ink-950);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(28px, 5vw, 64px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-hero__wash {
  position: absolute;
  inset: -20% -25% auto -25%;
  height: 130%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 68% at 80% 2%, rgba(63, 227, 210, 0.18), transparent 64%),
    radial-gradient(52% 60% at 4% 20%, rgba(255, 106, 43, 0.16), transparent 62%);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--sage);
}

.page-about .breadcrumb__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  border-bottom-color: currentColor;
}

.page-about .breadcrumb__sep {
  color: rgba(143, 168, 154, 0.6);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 36px;
  margin-top: clamp(32px, 6vw, 56px);
}

@media (min-width: 920px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.86fr);
    column-gap: 56px;
    align-items: end;
  }
}

.page-about .about-hero__label {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--sage);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(2.2rem, 7.4vw, 5rem);
  line-height: 1.03;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--signal);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 34rem;
  font-size: clamp(0.96rem, 1.4vw, 1.05rem);
  line-height: 1.9;
  color: #d5dcd5;
}

.page-about .about-hero__facts {
  margin: 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-hero__fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 2px;
  border-top: 1px solid var(--line);
}

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

.page-about .about-hero__key {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--sage);
}

.page-about .about-hero__val {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.92rem;
  color: var(--paper);
  text-align: right;
}

/* ---------- 纸面阅读区 ---------- */
.page-about .about-paper {
  background: var(--paper);
  color: var(--text-ink);
  padding: clamp(36px, 5vw, 64px) 0 clamp(56px, 8vw, 96px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: 40px;
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    column-gap: var(--about-index-gap);
    row-gap: 0;
  }
}

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

@media (min-width: 1024px) {
  .page-about .about-index {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    align-self: start;
  }
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: rgba(20, 32, 28, 0.48);
}

.page-about .about-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule-strong);
}

.page-about .about-index__link {
  display: flex;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-rule);
  font-size: 0.88rem;
  line-height: 1.45;
  color: var(--text-ink);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--signal);
  padding-left: 6px;
}

.page-about .about-index__num {
  padding-top: 2px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.7rem;
  color: rgba(20, 32, 28, 0.42);
}

.page-about .about-index__foot {
  margin: 16px 0 0;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(20, 32, 28, 0.45);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  min-width: 0;
  display: grid;
  gap: clamp(52px, 6vw, 80px);
}

.page-about .about-chapter {
  max-width: 800px;
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.page-about .about-chapter__num {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: rgba(20, 32, 28, 0.5);
}

.page-about .about-chapter__num::before {
  content: "";
  width: 22px;
  height: 3px;
  background: var(--signal);
}

.page-about .about-chapter__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.45rem, 3.5vw, 2.1rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text-ink);
}

.page-about .about-chapter__lede {
  margin: 16px 0 0;
  max-width: 38rem;
  font-size: 0.98rem;
  line-height: 1.9;
  color: rgba(20, 32, 28, 0.74);
}

.page-about .about-prose {
  display: grid;
  gap: 16px;
  margin-top: 22px;
  max-width: 40rem;
}

.page-about .about-prose p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--text-ink);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 30px 0 0;
}

.page-about .about-figure__media {
  position: relative;
  border: 1px solid var(--about-rule-strong);
  background: var(--paper-2);
  overflow: hidden;
}

.page-about .about-figure__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image:
    linear-gradient(to right, rgba(20, 32, 28, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20, 32, 28, 0.08) 1px, transparent 1px);
  background-size: 64px 64px;
}

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

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 0.78rem;
  line-height: 1.65;
  color: rgba(20, 32, 28, 0.55);
}

/* ---------- 团队四格 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 30px;
}

@media (min-width: 620px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    padding-bottom: 32px;
  }

  .page-about .about-team__card:nth-child(even) {
    transform: translateY(32px);
  }
}

.page-about .about-team__card {
  position: relative;
  padding: 22px 20px 26px;
  border: 1px solid var(--about-rule-strong);
  background: var(--paper-2);
  overflow: hidden;
  transition: background-color var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

.page-about .about-team__card:hover {
  background: #edeadf;
  border-color: rgba(255, 106, 43, 0.55);
}

.page-about .about-team__num {
  position: absolute;
  right: -8px;
  bottom: -30px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: 6rem;
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(20, 32, 28, 0.09);
  pointer-events: none;
}

.page-about .about-team__name {
  position: relative;
  margin: 0;
  font-family: var(--font-cond);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--text-ink);
}

.page-about .about-team__text {
  position: relative;
  margin: 8px 0 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(20, 32, 28, 0.78);
}

/* ---------- 流程 ---------- */
.page-about .about-steps {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps__item {
  position: relative;
  padding: 0 0 26px 32px;
  border-left: 1px solid var(--about-rule-strong);
}

.page-about .about-steps__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-800);
}

.page-about .about-steps__item:nth-child(1)::before { background: var(--signal); }
.page-about .about-steps__item:nth-child(2)::before { background: var(--cyan); }
.page-about .about-steps__item:nth-child(3)::before { background: var(--amber); }
.page-about .about-steps__item:nth-child(4)::before { background: var(--ink-800); }

.page-about .about-steps__step {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: rgba(20, 32, 28, 0.48);
}

.page-about .about-steps__title {
  margin: 0;
  font-family: var(--font-cond);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  color: var(--text-ink);
}

.page-about .about-steps__text {
  margin: 6px 0 0;
  max-width: 34rem;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(20, 32, 28, 0.78);
}

/* ---------- 档案卡 ---------- */
.page-about .about-note {
  margin-top: 28px;
  padding: 20px 22px;
  border: 1px solid var(--about-rule-strong);
  background: var(--paper-2);
}

.page-about .about-note__label {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: rgba(20, 32, 28, 0.5);
}

.page-about .about-note p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--text-ink);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline__list {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 24px;
}

.page-about .timeline__node {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--about-rule-strong);
  transition: background-color var(--t-base) var(--ease);
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.page-about .timeline__node:nth-child(1)::before { background: var(--signal); }
.page-about .timeline__node:nth-child(2)::before { background: var(--cyan); }
.page-about .timeline__node:nth-child(3)::before { background: var(--amber); }

.page-about .timeline__ver {
  display: inline-block;
  padding: 3px 9px;
  background: var(--ink-800);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
}

.page-about .timeline__title {
  margin: 12px 0 0;
  font-family: var(--font-cond);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  color: var(--text-ink);
}

.page-about .timeline__text {
  margin: 8px 0 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: rgba(20, 32, 28, 0.78);
}

@media (min-width: 760px) {
  .page-about .about-timeline__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid var(--about-rule-strong);
  }

  .page-about .timeline__node {
    padding: 30px 20px 0;
    border-left: 1px solid var(--about-rule);
  }

  .page-about .timeline__node::before {
    top: -5px;
    left: 20px;
  }

  .page-about .timeline__node:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .timeline__node:first-child::before {
    left: 0;
  }
}

@media (hover: hover) {
  .page-about .timeline__node:hover {
    background: rgba(20, 32, 28, 0.045);
  }
}

/* ---------- 数据横条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  border: 1px solid var(--about-rule-strong);
  background: var(--about-rule-strong);
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stats__cell {
  padding: 18px 16px 20px;
  background: var(--paper);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  letter-spacing: -0.01em;
  color: var(--text-ink);
}

.page-about .about-stats__key {
  display: block;
  margin-top: 8px;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: rgba(20, 32, 28, 0.6);
}

/* ---------- 项目清单 ---------- */
.page-about .about-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  max-width: 40rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-list__item {
  position: relative;
  padding: 12px 0 12px 20px;
  border-bottom: 1px solid var(--about-rule);
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-ink);
}

.page-about .about-list__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 8px;
  height: 1px;
  background: var(--signal);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 24px;
  margin-top: clamp(48px, 7vw, 84px);
  padding: clamp(26px, 4.5vw, 46px);
  background: var(--ink-800);
  color: var(--paper);
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

@media (min-width: 860px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    column-gap: 44px;
  }
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 12px 0 0;
  max-width: 34rem;
  font-size: 0.92rem;
  line-height: 1.85;
  color: #cfd6cf;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 24px;
  border: 1px solid transparent;
  font-family: var(--font-cond);
  font-weight: 800;
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: background-color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .about-cta .btn--signal {
  background: var(--signal);
  color: #14201c;
}

.page-about .about-cta .btn--signal:hover,
.page-about .about-cta .btn--signal:focus-visible {
  background: var(--signal-soft);
}

.page-about .about-cta .btn--ghost {
  background: transparent;
  border-color: rgba(244, 242, 234, 0.4);
  color: var(--paper);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-team__card,
  .page-about .timeline__node,
  .page-about .about-cta .btn,
  .page-about .breadcrumb__link {
    transition: none;
  }

  .page-about .about-team__card:nth-child(even) {
    transform: none;
  }
}
<<<END>>>