.page-about {
  --about-hair: rgba(34, 211, 238, .18);
  --about-hair-strong: rgba(34, 211, 238, .42);
  --about-panel: rgba(16, 26, 60, .78);
  position: relative;
  color: var(--gx-star);
  padding-bottom: clamp(48px, 8vw, 96px);
  background:
    radial-gradient(900px 520px at 84% -4%, rgba(108, 76, 241, .22), transparent 70%),
    radial-gradient(720px 460px at -6% 38%, rgba(34, 211, 238, .10), transparent 72%);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  letter-spacing: .04em;
}

.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 30px);
}

/* 首屏 */
.page-about .about-hero {
  padding-block: clamp(20px, 3vw, 36px) clamp(20px, 3vw, 32px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(28px, 4.4vw, 50px);
  line-height: 1.18;
  font-weight: 900;
}

.page-about .about-hero__lead {
  margin-top: 16px;
  max-width: 52ch;
  color: var(--gx-dust);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
}

.page-about .about-stats {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-stat {
  padding: 16px 18px;
  border: 1px solid var(--about-hair);
  border-radius: var(--gx-radius-m);
  background: linear-gradient(180deg, rgba(16, 26, 60, .92), rgba(6, 11, 31, .72));
  transition: border-color var(--gx-fast) var(--gx-ease), transform var(--gx-base) var(--gx-ease);
}

.page-about .about-stat:hover {
  transform: translateY(-3px);
  border-color: rgba(245, 185, 66, .55);
}

.page-about .about-stat__num {
  display: block;
  font-size: clamp(22px, 2.6vw, 30px);
  color: var(--gx-star);
  letter-spacing: .02em;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--gx-dust);
}

/* 左右分置布局 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  padding-top: clamp(20px, 3vw, 32px);
}

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

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--gx-font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gx-dust);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 14px;
  border: 1px solid var(--about-hair);
  border-radius: var(--gx-radius-pill);
  background: rgba(16, 26, 60, .66);
  color: var(--gx-dust);
  font-size: 13px;
  text-decoration: none;
  transition: color var(--gx-fast) var(--gx-ease), border-color var(--gx-fast) var(--gx-ease), background var(--gx-fast) var(--gx-ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--gx-star);
  border-color: rgba(245, 185, 66, .6);
  background: rgba(30, 46, 99, .8);
}

.page-about .about-rail__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gx-cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, .14);
}

.page-about .about-body {
  display: grid;
  gap: clamp(44px, 6vw, 76px);
  min-width: 0;
}

/* 通用区块 */
.page-about .about-section {
  min-width: 0;
}

.page-about .about-section h2 {
  margin: 10px 0 0;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.35;
}

.page-about .about-section > .gx-lead {
  margin-top: 14px;
  max-width: 62ch;
  color: var(--gx-dust);
  line-height: 1.85;
}

/* 团队构成 */
.page-about .about-team {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.page-about .about-role {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 20px;
  border: 1px solid var(--about-hair);
  border-radius: var(--gx-radius-l);
  background: linear-gradient(180deg, rgba(16, 26, 60, .94), rgba(6, 11, 31, .82));
  transition: transform var(--gx-base) var(--gx-ease), border-color var(--gx-fast) var(--gx-ease), background var(--gx-base) var(--gx-ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: translateY(-4px);
  border-color: rgba(245, 185, 66, .55);
  background: linear-gradient(180deg, rgba(30, 46, 99, .95), rgba(16, 26, 60, .85));
}

.page-about .about-role__ring {
  position: relative;
  width: 64px;
  height: 64px;
}

.page-about .about-role__ring svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .ring-track {
  fill: none;
  stroke: rgba(34, 211, 238, .14);
  stroke-width: 5;
}

.page-about .ring-arc {
  fill: none;
  stroke: var(--gx-cyan);
  stroke-width: 5;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 32px 32px;
  transition: stroke var(--gx-fast) var(--gx-ease);
}

.page-about .about-role:hover .ring-arc,
.page-about .about-role:focus-within .ring-arc {
  stroke: var(--gx-gold);
}

.page-about .about-role__num {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 15px;
  color: var(--gx-star);
}

.page-about .about-role h3 {
  margin: 0;
  font-size: 17px;
}

.page-about .about-role p {
  margin: 0;
  color: var(--gx-dust);
  font-size: 14px;
  line-height: 1.78;
}

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

.page-about .about-team__img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--gx-radius-l);
}

/* 内容上线流程 */
.page-about .about-flow {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(186px, 1fr));
  gap: 16px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 22px 18px 18px;
  border: 1px solid var(--about-hair);
  border-radius: var(--gx-radius-m);
  background: rgba(16, 26, 60, .72);
  transition: transform var(--gx-base) var(--gx-ease), border-color var(--gx-fast) var(--gx-ease);
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 16px;
  right: 16px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gx-cyan), rgba(108, 76, 241, .1));
  opacity: .75;
}

.page-about .about-flow__step:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 185, 66, .5);
}

.page-about .about-flow__num {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gx-cyan);
}

.page-about .about-flow__step h3 {
  margin: 8px 0;
  font-size: 17px;
}

.page-about .about-flow__step p {
  margin: 0;
  color: var(--gx-dust);
  font-size: 14px;
  line-height: 1.78;
}

/* 发展历程 */
.page-about .about-history__figure {
  margin: 28px 0 0;
}

.page-about .about-history__img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--gx-radius-l);
}

.page-about .about-timeline {
  position: relative;
  margin-top: 28px;
  padding-left: 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(34, 211, 238, .55), rgba(108, 76, 241, .42) 62%, rgba(108, 76, 241, .1));
}

.page-about .about-stage {
  position: relative;
  border-bottom: 1px solid rgba(34, 211, 238, .12);
}

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

.page-about .about-stage__head {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  color: var(--gx-star);
  transition: color var(--gx-fast) var(--gx-ease);
}

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

.page-about .about-stage__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--gx-font-mono);
  font-size: 16px;
  color: var(--gx-cyan);
  transition: color var(--gx-fast) var(--gx-ease);
}

.page-about .about-stage[open] .about-stage__head::after {
  content: "\2212";
  color: var(--gx-gold);
}

.page-about .about-stage__head:hover {
  color: var(--gx-gold);
}

.page-about .about-stage__dot {
  position: absolute;
  left: -25px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gx-void);
  border: 1px solid var(--gx-cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, .12);
  transition: background var(--gx-fast) var(--gx-ease), border-color var(--gx-fast) var(--gx-ease), box-shadow var(--gx-fast) var(--gx-ease);
}

.page-about .about-stage[open] .about-stage__dot {
  background: var(--gx-gold);
  border-color: var(--gx-gold);
  box-shadow: 0 0 0 4px rgba(245, 185, 66, .18);
}

.page-about .about-stage__tag {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--gx-cyan);
}

.page-about .about-stage[open] .about-stage__tag {
  color: var(--gx-gold);
}

.page-about .about-stage__body {
  padding: 0 0 20px;
  max-width: 62ch;
}

.page-about .about-stage__body p {
  margin: 0 0 12px;
  color: var(--gx-dust);
  font-size: 15px;
  line-height: 1.85;
}

.page-about .about-stage__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-stage__points li {
  position: relative;
  padding-left: 16px;
  color: var(--gx-dust);
  font-size: 14px;
  line-height: 1.72;
}

.page-about .about-stage__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 1px;
  background: var(--gx-cyan);
}

/* 能力与保障 */
.page-about .about-assurance {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-assurance__item {
  display: grid;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--about-hair);
  border-radius: var(--gx-radius-m);
  background: linear-gradient(160deg, rgba(36, 20, 84, .72), rgba(16, 26, 60, .62));
  transition: border-color var(--gx-fast) var(--gx-ease), transform var(--gx-base) var(--gx-ease);
}

.page-about .about-assurance__item:hover {
  transform: translateY(-3px);
  border-color: rgba(245, 185, 66, .5);
}

.page-about .about-assurance__item h3 {
  margin: 0;
  font-size: 14px;
  letter-spacing: .14em;
  color: var(--gx-cyan);
}

.page-about .about-assurance__item p {
  margin: 0;
  color: var(--gx-dust);
  font-size: 14.5px;
  line-height: 1.8;
}

/* 合作生态 */
.page-about .about-partners {
  position: relative;
  overflow: hidden;
  border-radius: var(--gx-radius-l);
  border: 1px solid rgba(108, 76, 241, .35);
  padding: clamp(24px, 4vw, 40px);
  background: linear-gradient(150deg, rgba(36, 20, 84, .9), rgba(6, 11, 31, .92));
}

.page-about .about-partners__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .34;
  z-index: 0;
}

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

.page-about .about-partners__inner h2 {
  margin: 10px 0 0;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.35;
}

.page-about .about-partners__inner .gx-lead {
  margin-top: 14px;
  max-width: 58ch;
  color: var(--gx-dust);
  line-height: 1.85;
}

.page-about .about-partners__grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-partners__item {
  padding: 18px;
  border: 1px solid rgba(34, 211, 238, .24);
  border-radius: var(--gx-radius-m);
  background: rgba(6, 11, 31, .6);
}

.page-about .about-partners__num {
  margin: 0;
  font-size: 26px;
  color: var(--gx-gold);
  letter-spacing: .04em;
}

.page-about .about-partners__item h3 {
  margin: 6px 0 8px;
  font-size: 16px;
}

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

/* 服务响应 */
.page-about .about-support {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-support__main,
.page-about .about-support__side {
  min-width: 0;
}

.page-about .about-support .gx-contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .about-support .gx-contact-item__value {
  word-break: break-word;
}

.page-about .about-promise {
  list-style: none;
  margin: 0;
  padding: 18px 20px;
  display: grid;
  gap: 12px;
  border: 1px solid var(--about-hair);
  border-radius: var(--gx-radius-m);
  background: rgba(16, 26, 60, .66);
}

.page-about .about-promise li {
  position: relative;
  padding-left: 18px;
  color: var(--gx-dust);
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .about-promise li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid var(--gx-mint);
  box-shadow: 0 0 0 2px rgba(94, 234, 212, .12);
}

.page-about .about-cta {
  margin-top: 28px;
  padding: clamp(22px, 3.4vw, 34px);
  border: 1px solid rgba(245, 185, 66, .28);
  border-radius: var(--gx-radius-l);
  background:
    radial-gradient(560px 200px at 10% 0%, rgba(245, 185, 66, .16), transparent 72%),
    rgba(16, 26, 60, .72);
  display: grid;
  gap: 18px;
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(19px, 2.2vw, 24px);
}

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

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

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

@media (min-width: 768px) {
  .page-about .about-assurance {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-support {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    padding: 0 0 0 18px;
    overflow: visible;
    position: relative;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 3px;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: linear-gradient(180deg, rgba(34, 211, 238, .55), rgba(108, 76, 241, .16));
  }

  .page-about .about-rail__link {
    border: 0;
    background: transparent;
    border-radius: 0;
    padding: 11px 0;
    position: relative;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -18px;
    top: 50%;
    width: 7px;
    height: 7px;
    margin-top: -3.5px;
    border-radius: 50%;
    background: var(--gx-orbit);
    border: 1px solid var(--gx-cyan);
    transition: background var(--gx-fast) var(--gx-ease), box-shadow var(--gx-fast) var(--gx-ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: transparent;
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus-visible::before {
    background: var(--gx-gold);
    box-shadow: 0 0 0 4px rgba(245, 185, 66, .18);
  }

  .page-about .about-rail__dot {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stat,
  .page-about .about-role,
  .page-about .about-flow__step,
  .page-about .about-assurance__item {
    transition: none;
  }

  .page-about .about-stat:hover,
  .page-about .about-role:hover,
  .page-about .about-role:focus-within,
  .page-about .about-flow__step:hover,
  .page-about .about-assurance__item:hover {
    transform: none;
  }
}