.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: clamp(32px, 5vw, 64px);
}
.page-about p {
  margin: 0 0 14px;
  line-height: 1.78;
  font-size: 15px;
}
.page-about .about-split > *,
.page-about .about-team > *,
.page-about .about-audience > *,
.page-about .about-assure > * {
  min-width: 0;
}

/* 面包屑 */
.page-about .breadcrumb {
  padding-top: clamp(14px, 2vw, 22px);
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}
.page-about .breadcrumb__item a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.page-about .breadcrumb__item a:hover {
  color: var(--ink);
  border-bottom-color: var(--lime);
}
.page-about .breadcrumb__sep {
  color: var(--mint-dim);
}

/* 首屏 */
.page-about .about-intro {
  padding: clamp(12px, 2.4vw, 22px) 0 clamp(26px, 4vw, 46px);
}
.page-about .about-intro__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 38px);
  margin-top: clamp(14px, 2.6vw, 26px);
}
.page-about h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin: 10px 0 16px;
}
.page-about .about-intro__lede {
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.82;
  max-width: 64ch;
}
.page-about .about-intro__aside {
  background: var(--ink);
  color: var(--paper);
  padding: 18px 20px;
  border-left: 4px solid var(--lime);
  box-shadow: var(--shadow-plate);
}
.page-about .about-intro__aside-label {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--lime);
}
.page-about .about-ruler {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-ruler li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding-top: 10px;
  border-top: 1px dashed var(--line-dark);
  font-size: 14px;
  line-height: 1.62;
  color: var(--paper);
}
.page-about .about-ruler li:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .about-ruler__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--amber);
  flex: none;
}
.page-about .about-facts {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.page-about .about-facts li {
  background: var(--card);
  padding: 14px 16px;
}
.page-about .about-facts b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--ink);
}
.page-about .about-facts span {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
}

/* 章节 */
.page-about .about-section {
  padding: clamp(28px, 4.6vw, 58px) 0;
}
.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.018em;
  margin: 8px 0 14px;
}
.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--teal);
}
.page-about .about-eyebrow--light {
  color: var(--lime);
}

/* 图文错位 */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}
.page-about .about-figure {
  margin: 0;
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--ink);
  box-shadow: var(--shadow-plate);
  max-width: 100%;
}
.page-about .about-split--flip .about-figure img {
  aspect-ratio: 9 / 7;
}
.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 3px solid var(--orange);
  font-size: 12px;
  line-height: 1.6;
  color: var(--stone);
}
.page-about .about-links {
  margin-top: 18px;
}

/* 时间轴刻度图 */
.page-about .about-timeline__ruler {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}
.page-about .about-timeline__ruler img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 1000 / 240;
  object-fit: cover;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line-soft);
}

/* 标签页（阶段筛选 / 目录层级） */
.page-about .about-tabs {
  margin-top: 16px;
}
.page-about .about-tabs__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--mint);
}
.page-about .about-tabs__bar .tab {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--line-soft);
  background: var(--card);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.3;
  padding: 8px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 140ms ease, color 140ms ease, border-color 140ms ease;
}
.page-about .about-tabs__bar .tab:hover {
  border-color: var(--ink);
}
.page-about .about-tabs__bar .tab[aria-selected="true"] {
  background: var(--lime);
  color: var(--ink-deep);
  border-color: var(--ink-deep);
  font-weight: 700;
}
.page-about .about-tabs__panel {
  display: block;
  background: var(--card);
  border: 1px solid var(--line-soft);
  border-left: 4px solid var(--lime);
  padding: 16px 18px;
}
.page-about .about-tabs__panel[hidden] {
  display: none;
}
.page-about .about-tabs__panel h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: -0.012em;
}
.page-about .about-tabs__panel p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
}

/* 版本机制深色面板 */
.page-about .about-version {
  background: linear-gradient(155deg, var(--ink) 0%, var(--ink-deep) 82%);
  color: var(--paper);
  padding: clamp(22px, 3.6vw, 44px);
  border-left: 6px solid var(--lime);
  box-shadow: var(--shadow-plate);
}
.page-about .about-version .about-h2 {
  color: var(--card);
}
.page-about .about-version > p {
  color: var(--mint);
  max-width: 62ch;
}
.page-about .about-version__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0;
  padding: 0;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}
.page-about .about-version__grid > div {
  background: rgba(255, 249, 236, 0.05);
  padding: 14px 16px;
}
.page-about .about-version__grid dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mint-dim);
}
.page-about .about-version__grid dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.8vw, 30px);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--amber);
}
.page-about .about-version__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-version__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--paper);
}
.page-about .about-version__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 9px;
  background: var(--lime);
}
.page-about .about-version__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 团队色块矩阵 */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 18px;
}
.page-about .about-team__cell {
  padding: 20px 18px;
  border-radius: var(--radius);
}
.page-about .about-team__cell h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: -0.012em;
}
.page-about .about-team__cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
}
.page-about .about-team__cell--a {
  background: var(--ink);
  color: var(--paper);
}
.page-about .about-team__cell--a h3 {
  color: var(--lime);
}
.page-about .about-team__cell--b {
  background: var(--teal);
  color: var(--card);
}
.page-about .about-team__cell--b h3 {
  color: var(--card);
}
.page-about .about-team__cell--c {
  background: var(--amber);
  color: var(--ink-deep);
}
.page-about .about-team__cell--c h3 {
  color: var(--ink-deep);
}

/* 展开的协作说明 */
.page-about .about-groups {
  display: grid;
  gap: 10px;
  margin-top: clamp(18px, 2.6vw, 26px);
}
.page-about .about-group {
  background: var(--card);
  border: 1px solid var(--line-soft);
  border-left: 4px solid var(--lime);
  padding: 14px 16px;
}
.page-about .about-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
  font-weight: 700;
  font-size: 15px;
  list-style: none;
}
.page-about .about-group summary::-webkit-details-marker {
  display: none;
}
.page-about .about-group summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--teal);
}
.page-about .about-group[open] summary::after {
  content: "–";
}
.page-about .about-group p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ink);
}

/* 稳定与可用 */
.page-about .about-assure {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 36px);
  border-top: 2px solid var(--ink);
  padding-top: clamp(18px, 2.6vw, 28px);
}
.page-about .about-assure__head p {
  color: var(--stone);
  font-size: 14.5px;
}
.page-about .about-assure__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .about-assure__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  background: var(--card);
  border-bottom: 3px solid var(--ink);
  padding: 14px 16px;
}
.page-about .about-assure__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  min-width: 2.4em;
  color: var(--teal);
  font-variant-numeric: tabular-nums;
}
.page-about .about-assure__list h3 {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 800;
}
.page-about .about-assure__list p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--stone);
}

/* 服务对象 */
.page-about .about-audience {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 18px;
}
.page-about .about-audience__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-plate);
  padding: 18px;
}
.page-about .about-audience__card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.32;
  letter-spacing: -0.012em;
}
.page-about .about-audience__card p {
  margin: 0;
  flex: 1;
  font-size: 14px;
  line-height: 1.74;
}
.page-about .about-audience__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.page-about .about-audience__links a {
  font-size: 13px;
  font-weight: 700;
  color: var(--teal);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid var(--lime);
}
.page-about .about-audience__links a:hover {
  color: var(--ink);
  border-bottom-color: var(--orange);
}

/* 尾部 */
.page-about .about-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: clamp(20px, 3vw, 32px);
  padding-top: clamp(16px, 2.6vw, 24px);
  border-top: 1px dashed var(--mint);
}
.page-about .about-foot p {
  margin: 0;
  font-size: 13.5px;
  color: var(--stone);
}
.page-about .to-top {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-deep);
  background: var(--lime);
  border: 1px solid var(--ink);
  padding: 8px 12px;
  text-decoration: none;
}
.page-about .to-top:hover {
  background: var(--amber);
}

/* 响应式 */
@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-version__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.75fr);
    align-items: end;
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
  .page-about .about-split--flip .about-split__media {
    order: -1;
  }
  .page-about .about-assure {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
}

@media (min-width: 1080px) {
  .page-about .about-split {
    gap: clamp(28px, 3.6vw, 52px);
  }
  .page-about h1 {
    max-width: 16ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tabs__bar .tab,
  .page-about .to-top {
    transition: none;
  }
}
<<<END>>>