.page-about {
  --about-rail-w: 110px;
  --about-block-gap: clamp(3rem, 7vw, 6rem);
  display: block;
  background: var(--paper);
  color: var(--ink);
  padding-block: clamp(1.25rem, 4vw, 2.5rem) clamp(2rem, 6vw, 4rem);
}

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

.page-about .about-shell {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-main {
  display: grid;
  gap: var(--about-block-gap);
  min-width: 0;
}

/* ---------- 年份刻度轴 ---------- */
.page-about .about-rail {
  position: sticky;
  top: 4.75rem;
  z-index: 4;
  background: var(--paper);
  border-bottom: 1px solid var(--sand);
  margin-inline: calc(var(--gutter) * -1);
  padding: 0.6rem var(--gutter);
}

.page-about .about-rail .site-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 1.35rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail .site-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .site-rail__item {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--steel);
  white-space: nowrap;
  flex: none;
  transition: color 0.24s var(--ease);
}

.page-about .site-rail__node {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sand);
  flex: none;
  align-self: center;
  transition: background 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .site-rail__year {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.page-about .site-rail__label {
  font-size: 0.66rem;
  color: var(--steel);
}

.page-about .site-rail__item.is-active {
  color: var(--ink);
}

.page-about .site-rail__item.is-active .site-rail__node {
  background: var(--signal);
  transform: scale(1.35);
}

/* ---------- 首屏 ---------- */
.page-about .about-intro {
  display: grid;
  gap: 1.1rem;
  padding-block: clamp(1rem, 3vw, 2rem) clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--sand);
}

.page-about .breadcrumbs {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .breadcrumbs__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--sand);
}

.page-about .breadcrumbs__link {
  color: var(--steel);
  text-decoration: none;
}

.page-about .breadcrumbs__link:hover {
  color: var(--signal);
}

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

.page-about .about-intro h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 5.6vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.032em;
  margin: 0;
  max-width: 20ch;
  color: var(--ink);
}

.page-about .about-intro__lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-intro__stamp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--steel);
}

/* ---------- 通用区块骨架 ---------- */
.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--signal);
  font-weight: 600;
}

.page-about .eyebrow--light {
  color: var(--signal);
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.2vw, 2.3rem);
  line-height: 1.18;
  letter-spacing: -0.022em;
  margin: 0;
  color: var(--ink);
}

.page-about .about-block {
  display: grid;
  gap: 1.5rem;
  min-width: 0;
}

.page-about .about-block__body {
  display: grid;
  gap: 0.85rem;
  min-width: 0;
}

.page-about .about-block__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-block__note {
  display: grid;
  gap: 0.6rem;
  border-top: 2px solid var(--signal);
  padding-top: 1rem;
  align-self: start;
}

.page-about .about-block__note-kicker {
  font-family: var(--font-mono) !important;
  font-size: 0.74rem !important;
  letter-spacing: 0.12em;
  color: var(--ink) !important;
}

.page-about .about-block__note p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- 三条主线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 1.5rem;
  min-width: 0;
}

.page-about .about-lines__head {
  display: grid;
  gap: 0.75rem;
}

.page-about .about-lines__lede {
  margin: 0;
  max-width: 58ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-lines__grid {
  display: grid;
  gap: 1.75rem;
  min-width: 0;
}

.page-about .about-lines__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-line {
  display: grid;
  gap: 0.35rem;
  padding: 1.1rem 1.2rem;
  background: var(--paper);
  border: 1px solid var(--sand);
  border-left: 4px solid var(--sage);
  border-radius: 3px;
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .about-line:nth-child(1) {
  border-left-color: var(--signal);
}

.page-about .about-line:nth-child(2) {
  border-left-color: var(--sage);
}

.page-about .about-line:nth-child(3) {
  border-left-color: var(--navy);
}

.page-about .about-line__no {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .about-line__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.08rem;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-about .about-line p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-lines__figure {
  margin: 0;
}

.page-about .about-lines__figure img {
  width: 100%;
  aspect-ratio: 14 / 9;
  border-radius: 3px;
}

/* ---------- 服务网络 ---------- */
.page-about .about-network {
  display: grid;
  gap: 1.5rem;
  min-width: 0;
}

.page-about .about-network__figure {
  margin: 0;
}

.page-about .about-network__figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  border-radius: 3px;
}

.page-about .about-network__body {
  display: grid;
  gap: 0.85rem;
  min-width: 0;
}

.page-about .about-network__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--ink);
}

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

.page-about .about-zone__item {
  position: relative;
  display: grid;
  gap: 0.3rem;
  padding: 1rem 0.25rem 1rem 1.1rem;
  border-bottom: 1px solid var(--sand);
}

.page-about .about-zone__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.6rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sage);
}

.page-about .about-zone__item:nth-child(2)::before {
  background: var(--signal);
}

.page-about .about-zone__zone {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ink);
}

.page-about .about-zone__prov {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--steel);
}

.page-about .about-zone__role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* ---------- 序列演进 ---------- */
.page-about .about-gen {
  display: grid;
  gap: 1.75rem;
  min-width: 0;
}

.page-about .about-gen__figure {
  margin: 0;
}

.page-about .about-gen__figure img {
  width: 100%;
  aspect-ratio: 7 / 5;
  border-radius: 3px;
}

.page-about .about-gen__head {
  display: grid;
  gap: 0.75rem;
}

.page-about .about-gen__head p {
  margin: 0;
  max-width: 60ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.5rem;
  border-left: 2px solid var(--sand);
  display: grid;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  gap: 0.5rem;
  padding: 1.35rem 0;
  border-bottom: 1px dashed var(--sand);
}

.page-about .about-timeline__item:last-child {
  border-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 5px);
  top: 1.85rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal);
}

.page-about .about-timeline__year {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: transparent;
  -webkit-text-stroke: 1px var(--signal);
  display: block;
}

@supports not (-webkit-text-stroke: 1px var(--signal)) {
  .page-about .about-timeline__year {
    color: var(--signal);
  }
}

.page-about .about-timeline__content {
  display: grid;
  gap: 0.35rem;
  min-width: 0;
}

.page-about .about-timeline__span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  color: var(--steel);
}

.page-about .about-timeline__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-about .about-timeline__desc {
  margin: 0;
  max-width: 56ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-gen__foot {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-link {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid var(--signal-mist);
  padding-bottom: 1px;
  transition: border-color 0.2s var(--ease);
}

.page-about .about-link:hover {
  border-bottom-color: var(--signal);
}

/* ---------- 质量与交付（深墨蓝） ---------- */
.page-about .about-quality {
  position: relative;
  display: grid;
  gap: 1.75rem;
  padding: clamp(1.75rem, 5vw, 3.5rem);
  border-radius: 4px;
  background-color: var(--navy);
  background-image: radial-gradient(circle at 1px 1px, rgba(247, 244, 239, 0.07) 1px, transparent 0);
  background-size: 18px 18px;
  overflow: hidden;
}

.page-about .about-quality h2 {
  color: var(--paper);
}

.page-about .about-quality__head {
  display: grid;
  gap: 0.75rem;
}

.page-about .about-quality__head p {
  margin: 0;
  max-width: 56ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: rgba(247, 244, 239, 0.78);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.15rem;
}

.page-about .about-flow__item {
  display: grid;
  gap: 0.35rem;
  padding-top: 0.85rem;
  border-top: 2px solid var(--signal);
}

.page-about .about-flow__no {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .about-flow__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-flow__desc {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.72;
  color: rgba(247, 244, 239, 0.72);
}

.page-about .about-quality__lower {
  display: grid;
  gap: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(247, 244, 239, 0.18);
}

.page-about .about-quality__lab h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  color: var(--paper);
}

.page-about .about-quality__lab p {
  margin: 0;
  max-width: 54ch;
  font-size: 0.9rem;
  line-height: 1.78;
  color: rgba(247, 244, 239, 0.72);
}

.page-about .about-quality__metrics {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.9;
  letter-spacing: 0.04em;
  color: rgba(247, 244, 239, 0.82);
}

.page-about .about-quality__metrics strong {
  font-size: 1.15rem;
  color: var(--signal);
  font-weight: 700;
}

/* ---------- 团队与伙伴 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1.5rem;
  min-width: 0;
}

.page-about .about-team__head {
  display: grid;
  gap: 0.75rem;
}

.page-about .about-team__head p {
  margin: 0;
  max-width: 58ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.15rem;
}

.page-about .about-roles__item {
  padding-top: 0.85rem;
  border-top: 1px solid var(--sand);
}

.page-about .about-roles__name {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-roles__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-partners {
  display: grid;
  gap: 0.5rem;
  padding: 1.15rem 1.2rem;
  border-left: 4px solid var(--sage);
  background: var(--paper);
  border-top: 1px solid var(--sand);
  border-right: 1px solid var(--sand);
  border-bottom: 1px solid var(--sand);
  border-radius: 3px;
}

.page-about .about-partners__lead {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .about-partners__lead strong {
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners__body {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .about-partners__rate {
  font-family: var(--font-mono);
  color: var(--verify);
  font-weight: 700;
}

.page-about .about-team__foot {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 发布节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  gap: 1rem;
  padding: clamp(1.5rem, 4vw, 2.75rem);
  background: var(--sand);
  border-radius: 4px;
}

.page-about .about-cadence p {
  margin: 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-cadence__list {
  list-style: none;
  margin: 0.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-cadence__item {
  display: grid;
  gap: 0.3rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--paper);
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-cadence__item .mono {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--ink);
}

.page-about .about-cadence .btn {
  justify-self: start;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 1rem;
  padding-top: clamp(1.75rem, 4vw, 2.75rem);
  border-top: 2px solid var(--ink);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 58ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .btn:focus-visible,
.page-about .about-link:focus-visible,
.page-about .breadcrumbs__link:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

/* ---------- 平板起 ---------- */
@media (min-width: 720px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem 1.75rem;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .about-zone__item {
    grid-template-columns: 88px minmax(0, 1fr);
    align-items: baseline;
    gap: 0.5rem 1.5rem;
    padding-block: 1.1rem;
  }

  .page-about .about-zone__role {
    grid-column: 2;
  }

  .page-about .about-cadence__item {
    grid-template-columns: 64px minmax(0, 1fr);
    align-items: baseline;
    gap: 1.25rem;
  }

  .page-about .about-quality__lower {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: end;
    gap: 2rem;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 130px minmax(0, 1fr);
    align-items: start;
    gap: 2rem;
  }
}

/* ---------- 桌面起 ---------- */
@media (min-width: 900px) {
  .page-about .about-block {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    gap: clamp(1.75rem, 4vw, 3.5rem);
    align-items: start;
  }

  .page-about .about-lines__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(1.75rem, 3.5vw, 3rem);
    align-items: start;
  }

  .page-about .about-line:nth-child(2) {
    margin-left: 1.5rem;
  }

  .page-about .about-line:nth-child(3) {
    margin-left: 0.75rem;
  }

  .page-about .about-network {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(1.75rem, 3.5vw, 3rem);
    align-items: start;
  }

  .page-about .about-network__figure {
    margin-top: 2.5rem;
  }

  .page-about .about-zone {
    grid-column: 1 / -1;
    margin-top: 0.75rem;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .about-timeline__item {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 3rem;
    padding-block: 1.6rem;
  }
}

/* ---------- 宽屏：左轨常驻 ---------- */
@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4.5rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 7.5rem;
    margin-inline: 0;
    padding: 0 0 0 1.25rem;
    border-bottom: 0;
    border-left: 1px solid var(--sand);
    background: transparent;
  }

  .page-about .about-rail .site-rail__list {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.85rem;
    overflow: visible;
  }

  .page-about .site-rail__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .page-about .about-intro h1 {
    max-width: 16ch;
  }
}
</｜｜DSML｜｜ parameter>
</｜｜DSML｜｜ invoke>
</｜｜DSML｜｜ calls>