.page-about {
  background: var(--night);
  color: var(--snow);
  font-family: var(--font-body);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  padding: 1.25rem 0 0.9rem;
}
.page-about .about-crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--teal);
  border-bottom-color: var(--teal);
}
.page-about .about-crumb [aria-current="page"] {
  color: var(--snow);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero__frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  min-height: 400px;
  padding: 1.75rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--night-2);
}
.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 64px;
  height: 64px;
  border: 1px solid var(--teal);
  opacity: 0.55;
  z-index: 3;
  pointer-events: none;
}
.page-about .about-hero__frame::before {
  top: 12px;
  left: 12px;
  border-right: 0;
  border-bottom: 0;
}
.page-about .about-hero__frame::after {
  bottom: 12px;
  right: 12px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  opacity: 0.42;
  filter: saturate(0.75);
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(105deg, rgba(11, 27, 51, 0.96) 18%, rgba(11, 27, 51, 0.62) 58%, rgba(11, 27, 51, 0.2) 100%),
    repeating-linear-gradient(90deg, rgba(143, 163, 191, 0.08) 0 1px, transparent 1px 72px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  max-width: 46rem;
}

.page-about .about-kicker {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--teal);
  text-transform: uppercase;
}

.page-about h1 {
  margin: 0.85rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--snow);
}

.page-about .about-lede {
  margin: 1rem 0 0;
  max-width: 40rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.6rem;
  margin: 1.6rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--mist);
}
.page-about .about-hero__meta b {
  display: inline-block;
  margin-right: 0.35rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--snow);
}

/* ---------- 侧边品牌轨道 ---------- */
.page-about .about-body {
  padding: 2.5rem 0 3.5rem;
}

.page-about .layout-rail__aside {
  align-self: start;
}

.page-about .about-rail {
  display: grid;
  gap: 1rem;
  padding-bottom: 1rem;
}

.page-about .about-rail__label {
  margin: 0;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.26em;
  color: var(--mist);
}

.page-about .about-rail__nav {
  display: grid;
  gap: 0.1rem;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  padding: 0.45rem 0 0.45rem 0.7rem;
  border-left: 1px solid var(--line-soft);
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.45;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-rail__link .mono {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--teal);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--snow);
  border-left-color: var(--teal);
}

.page-about .about-rail__cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.8rem 0.95rem;
  border-radius: var(--radius);
  background: var(--red);
  color: var(--white);
  font-size: 0.88rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 1px 0 rgba(11, 27, 51, 0.4);
  transition: filter 0.2s var(--ease), transform 0.2s var(--ease);
}
.page-about .about-rail__cta:hover,
.page-about .about-rail__cta:focus-visible {
  filter: brightness(1.08);
  transform: translateX(2px);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: 2.25rem 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-sec:first-of-type {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-sec__head {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 1.4rem;
}

.page-about .about-sec__index {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--yellow);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 4.2vw, 1.95rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-about .about-sec__note {
  margin: 0;
  max-width: 52ch;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-prose p {
  margin: 0 0 1rem;
  max-width: 62ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--text-dim);
}
.page-about .about-prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-prose strong {
  color: var(--snow);
  font-weight: 700;
}
.page-about .about-prose--tight p {
  margin-top: 1.4rem;
}

.page-about .about-footnote {
  margin: 1.4rem 0 0;
  padding-left: 0.9rem;
  border-left: 1px solid var(--yellow);
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--mist);
  max-width: 56ch;
}

/* ---------- 使用场景 ---------- */
.page-about .about-scenes {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-scenes__item {
  padding: 1rem 1.05rem;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--teal);
  border-radius: var(--radius);
  background: var(--panel);
}
.page-about .about-scenes__item:nth-child(2) {
  border-left-color: var(--red);
}
.page-about .about-scenes__item:nth-child(3) {
  border-left-color: var(--yellow);
}

.page-about .about-scenes__key {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--snow);
}

.page-about .about-scenes__item p {
  margin: 0.4rem 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 三次点击路径 ---------- */
.page-about .about-path {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
  counter-reset: about-path;
}

.page-about .about-path__step {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(19, 41, 75, 0.45);
}

.page-about .about-path__num {
  flex: none;
  display: grid;
  place-items: center;
  width: 1.7rem;
  height: 1.7rem;
  border: 1px solid var(--teal);
  border-radius: 50%;
  font-size: 0.78rem;
  color: var(--teal);
}

.page-about .about-path__step p {
  margin: 0.15rem 0 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 版本演进 ---------- */
.page-about .about-evo {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-evo__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}
.page-about .about-evo__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-evo__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .about-evo__item {
  position: relative;
  padding: 0 0 1.45rem 1.75rem;
}
.page-about .about-evo__item:last-child {
  padding-bottom: 0;
}
.page-about .about-evo__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.6rem;
  bottom: 0;
  width: 1px;
  background: var(--line);
}
.page-about .about-evo__item:last-child::before {
  display: none;
}
.page-about .about-evo__item::after {
  content: "";
  position: absolute;
  left: 1px;
  top: 0.42rem;
  width: 9px;
  height: 9px;
  border: 1px solid var(--teal);
  border-radius: 50%;
  background: var(--night);
}
.page-about .about-evo__item:nth-child(2)::after {
  border-color: var(--snow);
}
.page-about .about-evo__item:nth-child(3)::after {
  border-color: var(--green);
}
.page-about .about-evo__item:nth-child(4)::after {
  border-color: var(--yellow);
  background: var(--yellow);
}

.page-about .about-evo__ver {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--yellow);
}

.page-about .about-evo__item h3 {
  margin: 0.28rem 0 0;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--snow);
}

.page-about .about-evo__item p {
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-dim);
}

/* ---------- 团队与校验 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-team__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}
.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-checks {
  list-style: none;
  margin: 1.35rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-about .about-checks li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-dim);
}
.page-about .about-checks li::before {
  content: "—";
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  color: var(--teal);
}

/* ---------- 服务规模 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.page-about .about-stats__item {
  display: grid;
  gap: 0.3rem;
  padding: 0.95rem 1rem;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--teal);
  border-radius: var(--radius);
  background: rgba(19, 41, 75, 0.55);
}
.page-about .about-stats__item:nth-child(2n) {
  border-left-color: var(--red);
}
.page-about .about-stats__item:nth-child(3n) {
  border-left-color: var(--yellow);
}
.page-about .about-stats__item:nth-child(5) {
  border-left-color: var(--green);
}

.page-about .about-stats__num {
  font-size: clamp(1.35rem, 5vw, 1.8rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--snow);
}

.page-about .about-stats__label {
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  display: grid;
  gap: 1.35rem;
}

.page-about .about-eco__partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .about-eco__partners li {
  display: grid;
  gap: 0.25rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(19, 41, 75, 0.45);
}
.page-about .about-eco__partners strong {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--snow);
}
.page-about .about-eco__partners span {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-eco__note {
  display: grid;
  gap: 0.85rem;
  align-content: start;
}

.page-about .about-honor {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem;
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-eco__link {
  margin: 0.2rem 0 0;
}

/* ---------- 收尾入口 ---------- */
.page-about .about-next {
  margin-top: 2.25rem;
  padding: 1.4rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(19, 41, 75, 0.92), rgba(11, 27, 51, 0.55));
}

.page-about .about-next__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.15rem, 3.6vw, 1.5rem);
  line-height: 1.3;
  color: var(--snow);
}

.page-about .about-next__links {
  display: grid;
  gap: 0.6rem;
}

.page-about .about-next__links .arrow-link {
  display: block;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(11, 27, 51, 0.55);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--snow);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .about-next__links .arrow-link:hover,
.page-about .about-next__links .arrow-link:focus-visible {
  border-color: var(--teal);
  background: rgba(43, 179, 163, 0.12);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__frame {
    min-height: 460px;
    padding: 2.5rem 2rem;
  }
  .page-about .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-path {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-path__step {
    flex-direction: column;
    gap: 0.6rem;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-next__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-crumb {
    padding-top: 1.75rem;
  }
  .page-about .about-body {
    padding: 3.5rem 0 5rem;
  }
  .page-about .about-rail {
    position: sticky;
    top: 1.5rem;
  }
  .page-about .about-sec {
    padding: 3rem 0;
  }
  .page-about .about-evo {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 2.25rem;
    align-items: start;
  }
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 2.25rem;
    align-items: start;
  }
  .page-about .about-eco {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 2.25rem;
  }
  .page-about .about-next {
    padding: 2rem 1.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__cta,
  .page-about .about-rail__link,
  .page-about .about-next__links .arrow-link,
  .page-about .about-crumb a {
    transition: none;
  }
  .page-about .about-rail__cta:hover,
  .page-about .about-rail__cta:focus-visible {
    transform: none;
  }
}
<<<END>>>