.page-about {
  --about-rail: 108px;
  --about-glow: rgba(95, 242, 255, 0.16);
  color: var(--sk-white);
  font-family: var(--sk-font-body);
  background-color: var(--sk-deep);
  background-image:
    linear-gradient(rgba(140, 160, 179, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 160, 179, 0.055) 1px, transparent 1px);
  background-size: 56px 56px;
  overflow-x: clip;
}

.page-about section[id] {
  scroll-margin-top: 6rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.75rem, 4vw, 3rem) 0 clamp(2.25rem, 4.5vw, 3.5rem);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 76% 24%, var(--about-glow), transparent 58%),
    radial-gradient(circle at 16% 84%, rgba(167, 139, 250, 0.12), transparent 55%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-hero__copy .sk-breadcrumb {
  margin-bottom: 1.1rem;
}

.page-about .about-hero__kicker {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sk-orbit);
}

.page-about .about-hero h1 {
  margin: 0.7rem 0 1rem;
  font-family: var(--sk-font-head);
  font-size: clamp(2rem, 6.2vw, 3.4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about .about-hero__brand {
  background: linear-gradient(96deg, var(--sk-cyan), var(--sk-violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(0.98rem, 1.4vw, 1.1rem);
  line-height: 1.9;
  color: var(--sk-ink-soft);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1.1rem;
  margin: 1.7rem 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__stats li {
  padding-left: 0.75rem;
  border-left: 1px solid var(--sk-line-cyan);
  min-width: 0;
}

.page-about .about-hero__num {
  display: block;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 600;
  color: var(--sk-cyan);
  letter-spacing: 0.02em;
}

.page-about .about-hero__cap {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--sk-orbit);
}

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

.page-about .about-hero__visual {
  margin: 0;
  border-radius: var(--sk-radius-l);
  overflow: hidden;
  border: 1px solid var(--sk-line);
  box-shadow: 0 30px 60px -40px rgba(0, 0, 0, 0.9);
}

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

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-top: 1px solid var(--sk-line);
  border-bottom: 1px solid var(--sk-line);
  background: rgba(3, 7, 13, 0.62);
}

.page-about .about-index__inner {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  min-width: 0;
}

.page-about .about-index__label {
  flex: none;
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  color: var(--sk-cyan);
}

.page-about .about-index__list {
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0 0 0.15rem;
  list-style: none;
  overflow-x: auto;
  min-width: 0;
  scrollbar-width: thin;
}

.page-about .about-index__list a {
  display: inline-block;
  white-space: nowrap;
  padding: 0.3rem 0.68rem;
  border: 1px solid var(--sk-line);
  border-radius: 999px;
  font-size: 0.78rem;
  color: var(--sk-ink-soft);
  text-decoration: none;
  font-family: var(--sk-font-mono);
  transition: color var(--sk-speed) var(--sk-ease), border-color var(--sk-speed) var(--sk-ease), background-color var(--sk-speed) var(--sk-ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--sk-white);
  border-color: var(--sk-line-cyan);
  background: rgba(95, 242, 255, 0.08);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(2.4rem, 5vw, 4.25rem) 0;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--sk-line);
}

.page-about .about-section__inner {
  display: grid;
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: start;
}

.page-about .about-section__rail {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.page-about .about-section__rail::after {
  content: "";
  width: 52px;
  height: 1px;
  background: linear-gradient(90deg, var(--sk-line-cyan), transparent);
}

.page-about .about-section__index {
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1;
  color: var(--sk-cyan);
  letter-spacing: 0.04em;
}

.page-about .about-section__tag {
  font-size: 0.64rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sk-orbit);
}

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

.page-about .about-section__body h2 {
  margin: 0 0 0.9rem;
  font-family: var(--sk-font-head);
  font-size: clamp(1.45rem, 3.4vw, 2.1rem);
  font-weight: 680;
  line-height: 1.25;
  color: var(--sk-white);
}

.page-about .about-section__body > p {
  margin: 0;
  max-width: 64ch;
  font-size: 0.96rem;
  line-height: 1.9;
  color: var(--sk-ink-soft);
}

.page-about .about-section__body > p + p {
  margin-top: 0.9rem;
}

/* ---------- 01 定位 ---------- */
.page-about .about-position__note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 0.9rem;
  margin-top: 1.6rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--sk-line-cyan);
  border-radius: var(--sk-radius-m);
  background: linear-gradient(122deg, rgba(14, 42, 71, 0.9), rgba(3, 7, 13, 0.62));
}

.page-about .about-position__text {
  flex: 1 1 16rem;
  margin: 0;
  min-width: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--sk-ink-soft);
}

/* ---------- 02 时间线 ---------- */
.page-about .about-timeline__figure {
  margin: 1.5rem 0 0;
  border-radius: var(--sk-radius-m);
  overflow: hidden;
  border: 1px solid var(--sk-line);
}

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

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 0.85rem;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--sk-cyan), rgba(95, 242, 255, 0.06));
}

.page-about .about-timeline > li {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 0.9rem;
  position: relative;
}

.page-about .about-timeline > li::before {
  content: "";
  grid-column: 1;
  width: 9px;
  height: 9px;
  margin-top: 1.15rem;
  justify-self: center;
  border-radius: 50%;
  background: var(--sk-cyan);
  box-shadow: 0 0 12px rgba(95, 242, 255, 0.65);
}

.page-about .about-timeline__card {
  grid-column: 2;
  min-width: 0;
  padding: 0.95rem 1.1rem;
  border: 1px solid var(--sk-line);
  border-radius: var(--sk-radius-m);
  background: rgba(14, 42, 71, 0.42);
  transition: transform var(--sk-speed) var(--sk-ease), border-color var(--sk-speed) var(--sk-ease), background-color var(--sk-speed) var(--sk-ease);
}

.page-about .about-timeline__card:hover,
.page-about .about-timeline__card:focus-within {
  transform: translateY(-2px);
  border-color: var(--sk-line-cyan);
  background: rgba(14, 42, 71, 0.72);
}

.page-about .about-timeline__stage {
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  color: var(--sk-orbit);
}

.page-about .about-timeline__card h3 {
  margin: 0.4rem 0 0.4rem;
  font-family: var(--sk-font-head);
  font-size: 1rem;
  font-weight: 620;
  line-height: 1.45;
  color: var(--sk-white);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--sk-ink-soft);
}

.page-about .about-timeline__link {
  display: inline-block;
  margin-top: 0.6rem;
  font-size: 0.82rem;
  color: var(--sk-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--sk-line-cyan);
  transition: color var(--sk-speed) var(--sk-ease), border-color var(--sk-speed) var(--sk-ease);
}

.page-about .about-timeline__link:hover,
.page-about .about-timeline__link:focus-visible {
  color: var(--sk-orange);
  border-color: var(--sk-orange);
}

.page-about .about-timeline > li.is-current::before {
  background: var(--sk-orange);
  box-shadow: 0 0 14px rgba(255, 138, 61, 0.7);
}

.page-about .about-timeline > li.is-current .about-timeline__card {
  border-color: rgba(255, 138, 61, 0.45);
  background: linear-gradient(120deg, rgba(255, 138, 61, 0.1), rgba(14, 42, 71, 0.5));
}

.page-about .about-timeline > li.is-current .about-timeline__stage {
  color: var(--sk-orange);
}

/* ---------- 03 服务能力 ---------- */
.page-about .about-services {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2rem);
  margin-top: 1.75rem;
}

.page-about .about-services__grid {
  display: grid;
  gap: 0.9rem;
  min-width: 0;
}

.page-about .about-svc {
  position: relative;
  min-width: 0;
  padding: 1.15rem 1.15rem 1.05rem;
  border: 1px solid var(--sk-line);
  border-radius: var(--sk-radius-m);
  background: linear-gradient(158deg, rgba(14, 42, 71, 0.72), rgba(3, 7, 13, 0.52));
  overflow: hidden;
  transition: transform var(--sk-speed) var(--sk-ease), border-color var(--sk-speed) var(--sk-ease), box-shadow var(--sk-speed) var(--sk-ease);
}

.page-about .about-svc::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--sk-cyan), transparent 70%);
  opacity: 0.55;
  transition: opacity var(--sk-speed) var(--sk-ease);
}

.page-about .about-svc:hover,
.page-about .about-svc:focus-within {
  transform: translateY(-3px);
  border-color: var(--sk-line-cyan);
  box-shadow: 0 22px 40px -32px rgba(95, 242, 255, 0.7);
}

.page-about .about-svc:hover::before,
.page-about .about-svc:focus-within::before {
  opacity: 1;
}

.page-about .about-svc h3 {
  margin: 0.7rem 0 0.45rem;
  font-family: var(--sk-font-head);
  font-size: 1.05rem;
  font-weight: 640;
  color: var(--sk-white);
}

.page-about .about-svc p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--sk-ink-soft);
}

.page-about .about-svc__link {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.82rem;
  color: var(--sk-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--sk-line-cyan);
  transition: color var(--sk-speed) var(--sk-ease), border-color var(--sk-speed) var(--sk-ease);
}

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

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

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

/* ---------- 04 协作线 ---------- */
.page-about .about-ops {
  display: grid;
  gap: 0.75rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-ops__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  padding: 0.95rem 1.05rem;
  border-left: 2px solid var(--sk-teal);
  border-radius: 0 var(--sk-radius-s) var(--sk-radius-s) 0;
  background: rgba(3, 7, 13, 0.5);
  transition: border-color var(--sk-speed) var(--sk-ease), background-color var(--sk-speed) var(--sk-ease);
}

.page-about .about-ops__item:hover {
  border-left-color: var(--sk-cyan);
  background: rgba(14, 42, 71, 0.55);
}

.page-about .about-ops__num {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--sk-cyan);
  padding-top: 0.2rem;
}

.page-about .about-ops__item > div {
  min-width: 0;
}

.page-about .about-ops__item h3 {
  margin: 0 0 0.3rem;
  font-family: var(--sk-font-head);
  font-size: 0.98rem;
  font-weight: 620;
  color: var(--sk-white);
}

.page-about .about-ops__item p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.78;
  color: var(--sk-ink-soft);
}

/* ---------- 05 服务地区与联络 ---------- */
.page-about .about-contact {
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  margin-top: 1.6rem;
  padding: clamp(1.15rem, 3vw, 1.85rem);
  border: 1px solid var(--sk-line);
  border-radius: var(--sk-radius-l);
  background:
    radial-gradient(circle at 12% 16%, rgba(167, 139, 250, 0.16), transparent 56%),
    linear-gradient(142deg, rgba(14, 42, 71, 0.88), rgba(3, 7, 13, 0.9));
}

.page-about .about-contact__main,
.page-about .about-contact__side {
  min-width: 0;
}

.page-about .about-contact__label {
  margin: 0 0 0.7rem;
  font-size: 0.64rem;
  letter-spacing: 0.22em;
  color: var(--sk-orbit);
}

.page-about .about-contact__mail {
  margin: 0;
  font-family: var(--sk-font-head);
  font-size: clamp(1.05rem, 2.5vw, 1.5rem);
  font-weight: 640;
  line-height: 1.35;
  color: var(--sk-cyan);
  overflow-wrap: anywhere;
}

.page-about .about-contact__tel {
  margin: 0.55rem 0 0;
  font-family: var(--sk-font-mono);
  font-size: clamp(1rem, 2.2vw, 1.3rem);
  letter-spacing: 0.06em;
  color: var(--sk-white);
}

.page-about .about-contact__addr {
  margin: 0.7rem 0 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--sk-orbit);
}

.page-about .about-contact__side {
  padding-top: 1rem;
  border-top: 1px dashed var(--sk-line);
}

.page-about .about-contact__time {
  margin: 0;
  font-family: var(--sk-font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--sk-amber);
}

.page-about .about-contact__desc {
  margin: 0.6rem 0 1.1rem;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--sk-ink-soft);
}

/* ---------- 06 备案 ---------- */
.page-about .about-records {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.6rem;
}

.page-about .about-records__card {
  min-width: 0;
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--sk-line);
  border-radius: var(--sk-radius-m);
  background: rgba(3, 7, 13, 0.55);
}

.page-about .about-records__card--accent {
  border-color: rgba(167, 139, 250, 0.4);
  background: linear-gradient(140deg, rgba(167, 139, 250, 0.12), rgba(3, 7, 13, 0.6));
}

.page-about .about-records__label {
  display: block;
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--sk-orbit);
}

.page-about .about-records__value {
  margin: 0.55rem 0 0;
  font-family: var(--sk-font-mono);
  font-size: clamp(0.95rem, 2vw, 1.12rem);
  color: var(--sk-white);
  overflow-wrap: anywhere;
}

.page-about .about-records__value--text {
  font-family: var(--sk-font-head);
  letter-spacing: 0.01em;
  color: var(--sk-violet);
}

.page-about .about-records__note {
  margin: 0.7rem 0 0;
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--sk-ink-soft);
}

.page-about .about-records__copy {
  margin-top: 0.8rem;
}

.page-about .about-records__copy:focus-visible,
.page-about .about-index__list a:focus-visible,
.page-about .about-svc__link:focus-visible,
.page-about .about-timeline__link:focus-visible {
  outline: 2px solid var(--sk-cyan);
  outline-offset: 3px;
}

/* ---------- 断点 ---------- */
@media (min-width: 680px) {
  .page-about .about-services__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.02fr 0.98fr;
    align-items: center;
  }

  .page-about .about-section__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(1.5rem, 3vw, 2.75rem);
  }

  .page-about .about-section__rail {
    position: sticky;
    top: 5.5rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .page-about .about-section__rail::after {
    width: 1px;
    height: 60px;
    background: linear-gradient(180deg, var(--sk-line-cyan), transparent);
  }

  .page-about .about-services {
    grid-template-columns: 1.12fr 0.88fr;
    align-items: start;
  }

  .page-about .about-contact {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .page-about .about-contact__side {
    padding-top: 0;
    padding-left: clamp(1rem, 2.5vw, 1.75rem);
    border-top: 0;
    border-left: 1px dashed var(--sk-line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    transform: none !important;
  }
}
<<<END>>>