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

.page-about .about-crumb {
  margin: 22px 0 18px;
  font-size: 13px;
  color: var(--ink-2);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.page-about .about-crumb a {
  color: var(--cobalt);
  text-decoration: none;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  text-decoration: underline;
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-bottom: 56px;
}

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

/* 左侧章节索引 */
.page-about .about-index {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 14px;
}

.page-about .about-index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--copper);
  text-transform: uppercase;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index-list li {
  flex: 0 0 auto;
}

.page-about .about-index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--card);
  color: var(--ink);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--cobalt);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  border-color: var(--copper);
  color: var(--copper);
}

/* 首屏声明 */
.page-about .about-lede h1 {
  margin: 8px 0 16px;
  font-size: 30px;
  line-height: 1.28;
  letter-spacing: .03em;
  font-weight: 900;
  max-width: 18em;
}

.page-about .about-lede-text {
  margin: 0;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-2);
}

.page-about .about-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-fact {
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--copper);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: var(--shadow);
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cobalt-deep);
  line-height: 1.2;
}

.page-about .about-fact-label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--ink-2);
}

/* 章节通用 */
.page-about .about-chapter {
  margin-top: 44px;
  padding-top: 30px;
  border-top: 1px solid var(--rule);
}

.page-about .about-chapter--tint {
  padding: 28px 20px;
  background: var(--sand-2);
  border-top: 4px solid var(--copper);
  border-radius: var(--radius);
}

.page-about .about-chapter--panel {
  padding: 28px 20px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-about .about-chapter-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
}

.page-about .about-chapter-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cobalt);
  flex: 0 0 auto;
}

.page-about .about-chapter h2 {
  margin: 0;
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: .02em;
  font-weight: 900;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-split-text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-2);
  max-width: 640px;
}

.page-about .about-split-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-mini-note {
  padding: 12px 14px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--cobalt);
  border-radius: 6px;
  font-size: 14px !important;
  color: var(--ink) !important;
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .about-figure .dgo-small {
  margin-top: 8px;
  display: block;
  color: var(--ink-2);
}

.page-about .about-figure--wide {
  margin-bottom: 22px;
}

/* 三条原则 */
.page-about .principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .principle {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}

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

.page-about .principle-num {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--cobalt);
  letter-spacing: -.02em;
}

.page-about .principle-body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: .02em;
}

.page-about .principle-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .principle-out {
  display: inline-block;
  margin-top: 10px;
  padding: 4px 9px;
  background: var(--copper-light);
  color: var(--ink);
  border-radius: 4px;
  font-size: 13px;
  line-height: 1.5;
}

/* 阶段时间轴 */
.page-about .stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .stage-item {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 0 14px;
  padding-bottom: 22px;
}

.page-about .stage-item::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 30px;
  bottom: 0;
  width: 1px;
  background: var(--rule);
}

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

.page-about .stage-item:last-child::before {
  display: none;
}

.page-about .stage-num {
  width: 29px;
  height: 29px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--copper);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  position: relative;
  z-index: 1;
  transition: background 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .stage-item:hover .stage-num,
.page-about .stage-item:focus-within .stage-num {
  background: var(--cobalt);
  transform: translateX(2px);
}

.page-about .stage-body h3 {
  margin: 3px 0 6px;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: .02em;
  line-height: 1.4;
}

.page-about .stage-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-2);
  max-width: 620px;
}

.page-about .stage-body .dgo-tag {
  margin-top: 10px;
  display: inline-block;
}

/* 团队 */
.page-about .team-svg {
  display: block;
  width: 100%;
  height: auto;
  margin: 4px 0 22px;
}

.page-about .role-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .role {
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--copper);
  border-radius: var(--radius);
  padding: 14px 16px;
  transition: border-color 180ms var(--ease);
}

.page-about .role:hover,
.page-about .role:focus-within {
  border-left-color: var(--cobalt);
}

.page-about .role-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .role-name {
  margin: 0;
  font-size: 16px;
  font-weight: 900;
  letter-spacing: .02em;
}

.page-about .role-count {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cobalt);
  letter-spacing: .04em;
}

.page-about .role p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-2);
}

/* 质量与生态 */
.page-about .quality-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.page-about .quality-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-2);
}

.page-about .quality-mark {
  position: absolute;
  left: 0;
  top: 7px;
  width: 8px;
  height: 8px;
  background: var(--cobalt);
  border-radius: 2px;
}

/* 结尾入口 */
.page-about .about-cta {
  margin-top: 44px;
  padding: 28px 20px;
  background: var(--cobalt-deep);
  border-radius: var(--radius);
  color: #FFFFFF;
}

.page-about .about-cta-kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--copper-light);
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.4;
  letter-spacing: .02em;
  font-weight: 900;
  color: #FFFFFF;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 620px;
  font-size: 14px;
  line-height: 1.75;
  color: #E8E4DA;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

/* 平板及以上 */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-chapter--tint,
  .page-about .about-chapter--panel {
    padding: 32px 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 24px;
    align-self: start;
    border-bottom: 0;
    border-right: 1px solid var(--rule);
    padding: 0 16px 0 0;
  }

  .page-about .about-index-list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
  }

  .page-about .about-index-link {
    display: flex;
    width: 100%;
    padding: 7px 0 7px 10px;
    border: 0;
    border-left: 3px solid transparent;
    border-radius: 0;
    background: transparent;
    font-size: 14px;
    white-space: normal;
  }

  .page-about .about-index-link:hover,
  .page-about .about-index-link:focus-visible {
    border-left-color: var(--copper);
    color: var(--ink);
    background: var(--sand-2);
  }

  .page-about .about-lede h1 {
    font-size: 44px;
  }

  .page-about .about-chapter h2 {
    font-size: 28px;
  }

  .page-about .about-split {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 32px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: 0.9fr 1.1fr;
  }

  .page-about .principle {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 6px 18px;
    padding: 22px 0;
  }

  .page-about .principle-num {
    font-size: 40px;
  }

  .page-about .about-cta {
    padding: 34px 30px;
  }

  .page-about .about-cta h2 {
    font-size: 24px;
  }
}
<<<END>>>