.page-about {
  --about-index-w: 196px;
  padding-block: clamp(16px, 3vw, 32px) clamp(48px, 7vw, 96px);
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--haze-400);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-500);
}

.page-about .breadcrumb a {
  color: var(--haze-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--sig-400);
  border-bottom-color: var(--sig-400);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--paper-100);
}

/* 首屏 */
.page-about .story-hero {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 44px);
  border-bottom: 1px solid var(--line-500);
}

.page-about .story-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -1px;
  width: 22%;
  height: 1px;
  background: var(--sig-400);
}

.page-about .story-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 6.4vw, 4.4rem);
  line-height: 0.98;
  letter-spacing: -0.01em;
  color: var(--paper-100);
  margin: 12px 0 20px;
  max-width: 18ch;
}

.page-about .story-lead {
  max-width: 58ch;
  margin: 0 0 26px;
  font-size: clamp(0.98rem, 1.5vw, 1.1rem);
  line-height: 1.85;
  color: var(--haze-400);
}

.page-about .hero-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 0;
  margin: 0;
  padding: 0;
}

.page-about .hero-facts li {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--sig-400);
  padding-right: 14px;
  margin-right: 14px;
  border-right: 1px solid var(--line-500);
}

.page-about .hero-facts li:last-child {
  border-right: 0;
  padding-right: 0;
  margin-right: 0;
}

/* 主体布局 */
.page-about .story-layout {
  display: block;
  padding-top: clamp(24px, 4vw, 40px);
}

.page-about .story-index {
  margin-bottom: clamp(20px, 3vw, 28px);
  min-width: 0;
}

.page-about .story-index ul {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .story-index a {
  display: block;
  white-space: nowrap;
  padding: 7px 12px;
  font-size: 0.8rem;
  color: var(--haze-400);
  text-decoration: none;
  border: 1px solid var(--line-500);
  background: var(--ink-800);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .story-index a:hover,
.page-about .story-index a[aria-current="true"] {
  color: var(--sig-400);
  border-color: var(--sig-700);
}

.page-about .story-body {
  min-width: 0;
}

/* 章节 */
.page-about .chapter {
  position: relative;
  padding-block: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--line-500);
  scroll-margin-top: calc(var(--header-h) + 16px);
}

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

.page-about .chapter-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  line-height: 1;
  color: var(--ink-700);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .chapter-num {
    color: transparent;
    -webkit-text-stroke: 1px var(--line-500);
  }
}

.page-about .chapter-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.6vw, 2.35rem);
  line-height: 1.08;
  color: var(--paper-100);
  margin: 0 0 16px;
  max-width: 22ch;
}

.page-about .chapter-body p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--haze-400);
}

.page-about .chapter-body p:last-child {
  margin-bottom: 0;
}

.page-about .chapter-body strong {
  color: var(--paper-100);
  font-weight: 600;
}

/* 图片 */
.page-about .story-figure {
  margin: clamp(20px, 3vw, 30px) 0;
}

.page-about .story-figure .media-frame {
  border: 1px solid var(--line-500);
  background: var(--ink-800);
}

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

.page-about .figure-cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--haze-400);
}

/* 时间线 */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(var(--sig-400), var(--sig-700) 40%, var(--line-500));
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 28px) 30px;
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--sig-400);
}

.page-about .timeline-year {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--sig-400);
  margin-bottom: 4px;
}

.page-about .timeline-item h3 {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  font-weight: 600;
  color: var(--paper-100);
  margin: 0 0 6px;
}

.page-about .timeline-item p {
  margin: 0;
  max-width: 52ch;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--haze-400);
}

/* 引述块 */
.page-about .pull-quote {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: clamp(22px, 3.5vw, 34px) clamp(20px, 3vw, 34px);
  background: var(--cream-050);
  color: var(--ink-900);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .pull-quote p {
  margin: 0;
  max-width: 34ch;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.6vw, 1.65rem);
  line-height: 1.32;
  color: var(--ink-900);
}

.page-about .pull-quote .pull-quote-note {
  margin-top: 12px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--ink-700);
  opacity: 0.7;
}

/* 团队 */
.page-about .team-list {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-500);
}

.page-about .team-row {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  align-items: baseline;
  gap: 2px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-500);
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  line-height: 1;
  color: var(--sig-400);
}

.page-about .team-count small {
  font-size: 0.6rem;
  color: var(--haze-400);
  margin-left: 3px;
}

.page-about .team-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper-100);
  margin: 0 0 3px;
}

.page-about .team-desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--haze-400);
}

/* 数据链路 */
.page-about .flow {
  list-style: none;
  counter-reset: flow;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .flow li {
  counter-increment: flow;
  position: relative;
  padding: 0 0 20px 44px;
}

.page-about .flow li::before {
  content: "0" counter(flow);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--sig-400);
  padding: 3px 5px;
  border: 1px solid var(--sig-700);
}

.page-about .flow strong {
  display: block;
  margin-bottom: 3px;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--paper-100);
}

.page-about .flow p {
  margin: 0;
  max-width: 56ch;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--haze-400);
}

.page-about .data-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .data-stat {
  border: 1px solid var(--line-500);
  border-left: 3px solid var(--sig-700);
  background: var(--ink-800);
  padding: 13px 14px;
}

.page-about .data-stat b {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.15rem, 2.8vw, 1.5rem);
  line-height: 1.1;
  color: var(--sig-400);
  margin-bottom: 5px;
}

.page-about .data-stat span {
  display: block;
  font-size: 0.74rem;
  line-height: 1.5;
  letter-spacing: 0.03em;
  color: var(--haze-400);
}

/* 合规说明 */
.page-about .note-panel {
  margin: 18px 0;
  padding: 12px 0 12px 18px;
  border-left: 3px solid var(--act-400);
}

.page-about .note-panel p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--paper-100);
}

/* 原则 */
.page-about .principles {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .principles li {
  padding: 16px 18px;
  background: var(--ink-800);
  border: 1px solid var(--line-500);
  border-left: 3px solid var(--violet-500);
}

.page-about .principles h3 {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--paper-100);
  margin: 0 0 6px;
}

.page-about .principles p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--haze-400);
}

/* 尾部入口 */
.page-about .story-next {
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(22px, 4vw, 36px);
  border: 1px solid var(--line-500);
  background: linear-gradient(140deg, var(--ink-700), var(--ink-800) 55%, var(--ink-900));
  display: grid;
  gap: 18px;
}

.page-about .story-next h2 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  line-height: 1.15;
  color: var(--paper-100);
  margin: 0 0 8px;
}

.page-about .story-next p {
  margin: 0;
  max-width: 46ch;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--haze-400);
}

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

.page-about .next-links .btn,
.page-about .next-links .btn-ghost {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  font-size: 0.88rem;
}

/* 断点 */
@media (min-width: 560px) {
  .page-about .data-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .page-about .principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .team-row {
    grid-template-columns: 5rem minmax(0, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .story-layout {
    display: grid;
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .story-index {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    margin-bottom: 0;
  }

  .page-about .story-index ul {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .story-index li + li {
    margin-top: 2px;
  }

  .page-about .story-index a {
    white-space: normal;
    border: 0;
    border-left: 2px solid var(--line-500);
    background: transparent;
    padding: 7px 0 7px 14px;
    font-size: 0.84rem;
    line-height: 1.4;
  }

  .page-about .story-index a:hover,
  .page-about .story-index a[aria-current="true"] {
    color: var(--sig-400);
    border-left-color: var(--sig-400);
  }

  .page-about .chapter {
    padding-block: clamp(36px, 4vw, 56px);
  }

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

  .page-about .pull-quote {
    margin-left: clamp(0px, 2vw, 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .story-index a,
  .page-about .breadcrumb a {
    transition: none;
  }
}
<<<END>>>