.page-about {
  --about-line: var(--line);
  --about-dim: var(--muted);
  background: var(--ink);
  color: var(--text);
}

.page-about .about-hero {
  padding-top: clamp(20px, 3vw, 34px);
  padding-bottom: clamp(24px, 3.5vw, 44px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 5.6vw, 60px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: #fff;
}

.page-about .about-hero h1 .hl {
  color: var(--cyan);
  border-bottom: 3px solid var(--orange);
}

.page-about .about-hero__lead {
  margin: 0 0 24px;
  max-width: 46ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

.page-about .about-stats__cell {
  background: var(--panel);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 40px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-stats__label {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--about-dim);
}

.page-about .about-banner {
  margin: 0;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-banner figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  padding: 14px 18px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text);
  background: linear-gradient(to top, rgba(6, 8, 12, 0.88), rgba(6, 8, 12, 0));
}

.page-about .about-body {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  padding-top: clamp(34px, 5vw, 64px);
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--about-dim);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  font-size: 14px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  background: var(--ink-2);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

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

.page-about .about-index__n {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  opacity: 0.75;
}

.page-about .about-index__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-dim);
}

.page-about .about-index__note a {
  color: var(--porcelain);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-main {
  display: flex;
  flex-direction: column;
  gap: clamp(44px, 6vw, 88px);
  min-width: 0;
}

.page-about .about-block {
  min-width: 0;
  scroll-margin-top: 96px;
}

.page-about .about-block .section-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.18;
  color: #fff;
}

.page-about .about-block .section-lead {
  margin: 0 0 clamp(22px, 3vw, 34px);
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin: 0 0 12px;
}

.page-about .eyebrow--dark {
  color: var(--porcelain);
}

/* 时间线 */
.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--about-line);
}

.page-about .tl__item {
  position: relative;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 224, 200, 0.09);
}

.page-about .tl__details {
  border-bottom: 1px solid rgba(60, 74, 90, 0.55);
}

.page-about .tl__details summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  min-height: 44px;
  padding: 16px 0;
  transition: color 0.2s ease;
}

.page-about .tl__details summary::-webkit-details-marker {
  display: none;
}

.page-about .tl__details summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: 4px;
}

.page-about .tl__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .tl__title {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 500;
  color: var(--text);
}

.page-about .tl__details[open] .tl__title {
  color: #fff;
}

.page-about .tl__details[open] .tl__item::before,
.page-about .tl__details[open] ~ .tl__details summary {
  color: #fff;
}

.page-about .tl__body {
  padding: 0 0 18px;
}

.page-about .tl__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-dim);
}

/* 区域网络 */
.page-about .network {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(18, 28, 41, 0.9), rgba(6, 8, 12, 0.55));
}

.page-about .network__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .network__switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .network__switch label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 16px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  background: var(--ink-2);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

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

.page-about .netmap {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 0 auto;
}

.page-about .netmap__link {
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .netmap__flow {
  stroke: var(--cyan);
  stroke-width: 1.5;
  stroke-dasharray: 5 118;
  opacity: 0.75;
  animation: about-flow 4.5s linear infinite;
}

.page-about .netmap__flow--b {
  animation-delay: 1.4s;
}

.page-about .netmap__flow--c {
  animation-delay: 2.8s;
}

@keyframes about-flow {
  from { stroke-dashoffset: 123; }
  to { stroke-dashoffset: 0; }
}

.page-about .netmap__node circle {
  fill: var(--panel);
  stroke: var(--line);
  stroke-width: 1.5;
  transition: fill 0.2s ease, stroke 0.2s ease;
}

.page-about .netmap__node text {
  fill: var(--text);
  font-size: 13px;
  font-family: var(--font-sans);
  text-anchor: middle;
}

.page-about .netmap__core circle {
  fill: var(--ink-2);
  stroke: var(--cyan);
  stroke-width: 1.5;
}

.page-about .netmap__core text {
  fill: var(--cyan);
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font-sans);
  text-anchor: middle;
}

.page-about .network__panels {
  margin-top: clamp(14px, 2vw, 22px);
}

.page-about .network__panel {
  display: none;
  margin: 0;
  padding: 16px 18px;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--panel);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about #r-jx:checked ~ .network__switch label[for="r-jx"],
.page-about #r-hn:checked ~ .network__switch label[for="r-hn"],
.page-about #r-hb:checked ~ .network__switch label[for="r-hb"],
.page-about #r-ah:checked ~ .network__switch label[for="r-ah"],
.page-about #r-fj:checked ~ .network__switch label[for="r-fj"],
.page-about #r-gd:checked ~ .network__switch label[for="r-gd"],
.page-about #r-zj:checked ~ .network__switch label[for="r-zj"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  font-weight: 500;
}

.page-about #r-jx:checked ~ .network__panels .panel--jx,
.page-about #r-hn:checked ~ .network__panels .panel--hn,
.page-about #r-hb:checked ~ .network__panels .panel--hb,
.page-about #r-ah:checked ~ .network__panels .panel--ah,
.page-about #r-fj:checked ~ .network__panels .panel--fj,
.page-about #r-gd:checked ~ .network__panels .panel--gd,
.page-about #r-zj:checked ~ .network__panels .panel--zj {
  display: block;
}

.page-about #r-jx:checked ~ .network__stage .node--jx circle,
.page-about #r-hn:checked ~ .network__stage .node--hn circle,
.page-about #r-hb:checked ~ .network__stage .node--hb circle,
.page-about #r-ah:checked ~ .network__stage .node--ah circle,
.page-about #r-fj:checked ~ .network__stage .node--fj circle,
.page-about #r-gd:checked ~ .network__stage .node--gd circle,
.page-about #r-zj:checked ~ .network__stage .node--zj circle {
  fill: var(--cyan);
  stroke: var(--cyan);
  filter: drop-shadow(0 0 8px rgba(34, 224, 200, 0.65));
}

.page-about #r-hn:checked ~ .network__stage .node--hn text,
.page-about #r-hb:checked ~ .network__stage .node--hb text,
.page-about #r-ah:checked ~ .network__stage .node--ah text,
.page-about #r-fj:checked ~ .network__stage .node--fj text,
.page-about #r-gd:checked ~ .network__stage .node--gd text,
.page-about #r-zj:checked ~ .network__stage .node--zj text {
  fill: var(--cyan);
}

/* 服务内容（暖纸区） */
.page-about .about-services {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--paper);
  color: var(--ink-2);
  padding: clamp(26px, 4vw, 52px) clamp(20px, 3.4vw, 46px);
}

.page-about .about-services__texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.1;
  pointer-events: none;
}

.page-about .about-services__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-services .section-title {
  color: var(--ink-2);
}

.page-about .about-services .section-lead {
  color: #36414f;
}

.page-about .about-services__grid {
  display: grid;
  gap: 14px;
}

.page-about .svc {
  position: relative;
  padding: 20px 20px 22px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(13, 19, 28, 0.12);
  box-shadow: 0 10px 26px -18px rgba(13, 19, 28, 0.5);
}

.page-about .svc__n {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--porcelain);
  margin-bottom: 8px;
}

.page-about .svc h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  color: var(--ink-2);
}

.page-about .svc p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: #36414f;
}

.page-about .svc__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
}

.page-about .svc__link:hover,
.page-about .svc__link:focus-visible {
  color: var(--porcelain);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.page-about .about-team__media {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 11 / 8;
  object-fit: cover;
}

.page-about .about-team__media figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-dim);
  background: var(--ink-2);
}

.page-about .roles {
  margin: 0 0 18px;
  display: grid;
  gap: 12px;
}

.page-about .roles__row {
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  background: var(--panel);
  border-left: 2px solid var(--porcelain);
}

.page-about .roles__row dt {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .roles__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-team__footer {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .about-team__footer a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 认证与流程 */
.page-about .about-cert {
  position: relative;
  padding-top: clamp(26px, 3.6vw, 44px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-cert::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(56px, 12vw, 132px);
  height: 3px;
  background: var(--orange);
}

.page-about .about-cert__grid {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(26px, 3.6vw, 42px);
}

.page-about .cert-card {
  padding: 20px 20px 22px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  background: var(--ink-2);
}

.page-about .cert-card--contact {
  background: var(--panel);
  border-color: rgba(47, 111, 181, 0.6);
}

.page-about .cert-card__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--about-dim);
}

.page-about .cert-card__value {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1.4;
  color: var(--cyan);
  word-break: break-word;
}

.page-about .cert-card--contact .cert-card__value {
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
}

.page-about .cert-card__note {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-dim);
}

.page-about .about-cert__sub {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 500;
  color: #fff;
}

.page-about .flow {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow__step {
  position: relative;
  padding: 18px 18px 20px;
  border-radius: var(--radius-sm);
  background: var(--panel);
  border: 1px solid transparent;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .flow__step:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .flow__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .flow__step h4 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: #fff;
}

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

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

.page-about .about-cert__foot a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 下一步 */
.page-about .about-next {
  padding-bottom: clamp(56px, 8vw, 100px);
}

.page-about .about-next__inner {
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-next__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  color: #fff;
}

.page-about .about-next__grid {
  display: grid;
  gap: 12px;
}

.page-about .about-next__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 44px;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--about-line);
  background: linear-gradient(145deg, rgba(18, 28, 41, 0.95), rgba(6, 8, 12, 0.6));
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  border-color: var(--orange);
  transform: translateY(-3px);
}

.page-about .about-next__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-next__label {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 500;
  color: #fff;
}

.page-about .about-next__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-dim);
}

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .svc--wide {
    grid-column: span 2;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: center;
  }

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

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: 224px minmax(0, 1fr);
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    align-self: start;
    padding-right: 22px;
    border-right: 1px solid var(--about-line);
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    margin-bottom: 18px;
  }

  .page-about .about-index__list a {
    border: 0;
    border-radius: 0;
    background: transparent;
    padding: 8px 0;
    justify-content: flex-start;
    color: var(--about-dim);
  }

  .page-about .about-index__list a:hover,
  .page-about .about-index__list a:focus-visible {
    color: var(--cyan);
    padding-left: 6px;
  }

  .page-about .about-index__list li + li {
    border-top: 1px solid rgba(60, 74, 90, 0.4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .netmap__flow {
    animation: none;
  }

  .page-about .flow__step:hover,
  .page-about .about-next__item:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>