.page-about {
  color: var(--text);
}

.page-about .about-crumbs {
  padding-top: 26px;
}

/* 首屏：窄栏自述 */
.page-about .about-intro__inner {
  max-width: 44rem;
}

.page-about .about-intro h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(28px, 7.2vw, 44px);
  line-height: 1.18;
  color: var(--text);
}

.page-about .about-intro__lead {
  margin: 20px 0 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-intro__body {
  margin: 14px 0 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--text-dim);
}

/* 数据带 */
.page-about .about-figures {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-figure {
  background: var(--floor);
  padding: 18px 16px;
}

.page-about .about-figure__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 32px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-figure__label {
  display: block;
  margin-top: 10px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

/* 章节头 */
.page-about .about-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

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

.page-about .about-head__idx {
  flex: 0 0 auto;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(30px, 8vw, 44px);
  line-height: 1;
  color: var(--violet);
  opacity: 0.75;
}

.page-about .about-head h2 {
  margin: 0;
  font-size: clamp(22px, 5.4vw, 32px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-head__sub {
  margin: 12px 0 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--text-dim);
}

/* 起源章节：7:4 错位分栏 */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-prose p {
  margin: 16px 0 0;
  max-width: 40rem;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-prose blockquote {
  margin: 22px 0 0;
  padding: 10px 0 10px 16px;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-serif);
  font-size: var(--fs-20);
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-card-note {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--panel);
  padding: 20px;
}

.page-about .about-card-note h3 {
  margin: 0;
  font-size: var(--fs-17);
  color: var(--text);
}

.page-about .about-card-note ul {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-card-note li {
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-card-note .tag {
  margin-right: 6px;
}

.page-about .about-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--text-mute);
}

/* 图片容器 */
.page-about .about-media {
  margin: 26px 0 0;
}

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

/* 团队分工数字条 */
.page-about .about-roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-role {
  background: var(--panel);
  padding: 20px 18px;
  transition: background-color 180ms ease;
}

.page-about .about-role:hover {
  background: var(--floor);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 8vw, 40px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-role__name {
  display: block;
  margin-top: 12px;
  font-size: var(--fs-17);
  font-weight: 700;
  color: var(--text);
}

.page-about .about-role__desc {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-dim);
}

/* 五道工序 */
.page-about .about-steps {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-step {
  background: var(--panel);
  padding: 18px;
  transition: background-color 180ms ease, box-shadow 180ms ease;
}

.page-about .about-step:hover {
  background: var(--floor);
  box-shadow: inset 0 2px 0 var(--cyan);
}

.page-about .about-step__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-step h3 {
  margin: 10px 0 0;
  font-size: var(--fs-17);
  color: var(--text);
}

.page-about .about-step p {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-step__out {
  display: block;
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--text-mute);
}

/* 内容栏目 */
.page-about .about-channels {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-channel {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--panel);
  padding: 20px;
  transition: border-color 180ms ease;
}

.page-about .about-channel:hover {
  border-color: var(--cyan);
}

.page-about .about-channel__no {
  font-family: var(--font-serif);
  font-size: var(--fs-20);
  color: var(--violet);
}

.page-about .about-channel h3 {
  margin: 6px 0 0;
  font-size: var(--fs-20);
  color: var(--text);
}

.page-about .about-channel p {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-library__stat {
  margin: 20px 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius-s);
  background: var(--floor);
}

.page-about .about-library__stat p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--text);
}

/* 横向滚动时间线 */
.page-about .about-timeline {
  margin-top: 24px;
  overflow-x: auto;
  padding-bottom: 10px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-about .about-timeline:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .about-timeline__track {
  list-style: none;
  margin: 0;
  padding: 0 2px 4px;
  display: flex;
  gap: 14px;
  width: max-content;
}

.page-about .about-timeline__card {
  flex: 0 0 auto;
  width: 262px;
  scroll-snap-align: start;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--panel);
  padding: 18px;
  transition: border-color 180ms ease;
}

.page-about .about-timeline__card:hover {
  border-color: var(--cyan);
}

.page-about .about-timeline__card h3 {
  margin: 14px 0 0;
  font-size: var(--fs-17);
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-timeline__card p {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-timeline__hint {
  margin: 12px 0 0;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--text-mute);
}

/* 合作与盘点 */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-partners p {
  margin: 16px 0 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-partners__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-partners__stats li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  background: var(--floor);
  padding: 16px 18px;
  font-size: var(--fs-12);
  letter-spacing: 0.03em;
  color: var(--text-dim);
}

.page-about .about-partners__stats span {
  font-family: var(--font-mono);
  font-size: var(--fs-24);
  line-height: 1;
  color: var(--cyan);
}

/* 收束面板 */
.page-about .about-next__panel {
  padding: 24px;
}

.page-about .about-next__panel h2 {
  margin: 0;
  font-size: clamp(20px, 5vw, 24px);
  color: var(--text);
}

.page-about .about-next__panel p {
  margin: 12px 0 0;
  max-width: 40rem;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-next__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
}

.page-about .about-next__link {
  font-size: var(--fs-14);
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-bottom-color: var(--cyan);
}

/* 中等宽度 */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-roles {
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  }

  .page-about .about-timeline__card {
    width: 300px;
  }
}

/* 桌面：宽窄交替与五列工序 */
@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-split__aside {
    margin-top: 48px;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-next__panel {
    padding: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-step,
  .page-about .about-channel,
  .page-about .about-timeline__card,
  .page-about .about-next__link {
    transition: none;
  }
}
<<<END>>>