.page-about {
  --ab-node: var(--ky-cyan);
  --ab-rail-w: 200px;
  --ab-flow-gap: 56px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--ky-header-h) + 26px) 0 52px;
  border-bottom: 1px solid var(--ky-line);
  background: linear-gradient(180deg, var(--ky-black) 0%, #080c18 100%);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .14;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .95), transparent 88%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(115% 85% at 8% 0%, rgba(31, 107, 255, .18), transparent 58%);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 24px;
}

.page-about .about-hero__lead .ky-title-xl {
  margin: 12px 0 0;
  line-height: 1.05;
}

.page-about .about-hero__lead .ky-lede {
  margin-top: 20px;
  max-width: 44ch;
}

.page-about .about-hero__state {
  margin-top: 26px;
}

.page-about .about-hero__panel {
  position: relative;
  padding: 24px 22px 22px;
  border-radius: var(--ky-radius);
}

.page-about .about-hero__panel-label {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--ky-cyan);
  text-transform: uppercase;
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-stats li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ky-line);
}

.page-about .about-stats li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-stats__num {
  flex: 0 0 auto;
  min-width: 74px;
  font-size: 26px;
  line-height: 1;
  color: var(--ky-white);
  letter-spacing: -.01em;
}

.page-about .about-stats__suffix {
  font-size: 14px;
  color: var(--ky-cyan);
  margin-left: 2px;
}

.page-about .about-stats__unit {
  font-size: 14px;
  color: var(--ky-body);
  line-height: 1.5;
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  padding: 56px 0 76px;
}

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

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

.page-about .about-sec {
  scroll-margin-top: calc(var(--ky-header-h) + 24px);
}

.page-about .about-sec + .about-sec {
  margin-top: 68px;
}

.page-about .ky-section__head .ky-lede {
  max-width: 62ch;
}

/* ---------- 斜向分隔 ---------- */
.page-about .about-slice {
  height: 3px;
  margin: 64px 0 0;
  background: repeating-linear-gradient(
    90deg,
    var(--ky-line-strong) 0 14px,
    transparent 14px 30px
  );
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 34px 0 0;
  padding: 0 0 0 42px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 26px;
  bottom: 26px;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--ky-cyan) 0%,
    rgba(51, 240, 210, .3) 55%,
    rgba(51, 240, 210, .04) 100%
  );
}

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

.page-about .about-timeline__item + .about-timeline__item {
  margin-top: 26px;
}

.page-about .about-timeline__node {
  position: absolute;
  left: -36px;
  top: 24px;
  width: 14px;
  height: 14px;
  background: var(--ky-black);
  border: 2px solid var(--ab-node);
  transform: rotate(45deg);
  transition: background-color .35s ease, box-shadow .35s ease;
}

.page-about .ky-reveal.is-in .about-timeline__node {
  background: var(--ky-cyan);
  box-shadow: 0 0 0 5px rgba(51, 240, 210, .14);
}

.page-about .about-timeline__item:nth-child(1) .about-timeline__node { transition-delay: .04s; }
.page-about .about-timeline__item:nth-child(2) .about-timeline__node { transition-delay: .16s; }
.page-about .about-timeline__item:nth-child(3) .about-timeline__node { transition-delay: .28s; }
.page-about .about-timeline__item:nth-child(4) .about-timeline__node { transition-delay: .40s; }

.page-about .about-timeline__card {
  position: relative;
  padding: 22px 20px 20px;
  border: 2px solid var(--ky-line);
  border-radius: var(--ky-radius);
  background: var(--ky-panel);
  transition: border-color .24s ease, box-shadow .24s ease, transform .24s ease;
}

.page-about .about-timeline__card:hover {
  border-color: var(--ky-line-strong);
  box-shadow: var(--ky-shadow);
  transform: translate(-2px, -2px);
}

.page-about .about-timeline__tag {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ky-amber);
  text-transform: uppercase;
}

.page-about .about-timeline__title {
  margin: 0 0 12px;
  font-size: 24px;
  line-height: 1.25;
  color: var(--ky-white);
  letter-spacing: .01em;
}

.page-about .about-timeline__card p {
  margin: 0;
  color: var(--ky-body);
  font-size: 16px;
  line-height: 1.7;
}

.page-about .about-timeline__foot {
  margin-top: 12px !important;
  padding-top: 12px;
  border-top: 1px dashed var(--ky-line);
  font-size: 14px !important;
  color: var(--ky-mist) !important;
}

/* 参差节奏 */
@media (min-width: 760px) {
  .page-about .about-timeline__item:nth-child(2) .about-timeline__card {
    margin-left: 7%;
  }
  .page-about .about-timeline__item:nth-child(3) .about-timeline__card {
    margin-right: 11%;
  }
  .page-about .about-timeline__item:nth-child(4) .about-timeline__card {
    margin-left: 4%;
    margin-right: 4%;
  }
}

/* ---------- 能力 ---------- */
.page-about .about-cap {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.page-about .about-cap__card {
  position: relative;
  padding: 24px 22px 22px;
  border: 2px solid var(--ky-line);
  border-radius: var(--ky-radius);
  background: linear-gradient(160deg, var(--ky-panel) 0%, #0c1220 100%);
  transition: border-color .24s ease, transform .24s ease;
}

.page-about .about-cap__card:hover {
  border-color: var(--ky-cyan);
  transform: translateY(-3px);
}

.page-about .about-cap__card--wide {
  background: linear-gradient(150deg, var(--ky-indigo) 0%, #0d1730 100%);
}

.page-about .about-cap__idx {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--ky-cyan);
  margin-bottom: 12px;
}

.page-about .about-cap__title {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.3;
  color: var(--ky-white);
}

.page-about .about-cap__card p {
  margin: 0;
  color: var(--ky-body);
  font-size: 15.5px;
  line-height: 1.7;
}

.page-about .about-cap__note {
  margin-top: 12px !important;
  padding-left: 12px;
  border-left: 2px solid var(--ky-amber);
  font-size: 14px !important;
  color: var(--ky-mist) !important;
}

.page-about .about-cap__link {
  margin: 26px 0 0;
}

/* ---------- 数据能力 ---------- */
.page-about .about-data__grid {
  margin-top: 34px;
  display: grid;
  gap: 24px;
}

.page-about .about-data__cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-data__card {
  position: relative;
  padding: 18px 16px 18px;
  border: 2px solid var(--ky-line);
  border-radius: var(--ky-radius);
  background: var(--ky-panel);
  outline: none;
  transition: border-color .22s ease, box-shadow .22s ease, transform .22s ease;
}

.page-about .about-data__card:hover,
.page-about .about-data__card:focus-visible,
.page-about .about-data__card:focus-within {
  border-color: var(--ky-cyan);
  box-shadow: var(--ky-shadow);
  transform: translate(-2px, -2px);
}

.page-about .about-data__num {
  margin: 0;
  font-size: 32px;
  line-height: 1;
  color: var(--ky-cyan);
  letter-spacing: -.02em;
}

.page-about .about-data__plus {
  font-size: 14px;
  margin-left: 3px;
  color: var(--ky-amber);
}

.page-about .about-data__label {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ky-body);
}

.page-about .about-data__note {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ky-mist);
  transition: max-height .28s ease, opacity .28s ease, margin-top .28s ease;
}

.page-about .about-data__card:hover .about-data__note,
.page-about .about-data__card:focus-visible .about-data__note,
.page-about .about-data__card:focus-within .about-data__note {
  max-height: 90px;
  opacity: 1;
  margin-top: 10px;
}

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

.page-about .about-data__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--ky-line);
  border-radius: var(--ky-radius);
}

/* ---------- 支持团队 ---------- */
.page-about .about-support {
  margin-top: 34px;
  display: grid;
  gap: 22px;
}

.page-about .about-support__steps {
  display: grid;
  gap: 14px;
  padding-left: 0;
}

.page-about .about-support__step {
  position: relative;
  padding: 20px 20px 20px 62px;
  border: 2px solid var(--ky-line);
  border-radius: var(--ky-radius);
  background: var(--ky-panel);
}

.page-about .about-support__step:nth-child(2) {
  border-color: rgba(51, 240, 210, .32);
}

.page-about .about-support__step:nth-child(3) {
  border-color: rgba(255, 162, 58, .3);
}

.page-about .about-support__no {
  position: absolute;
  left: 18px;
  top: 20px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  font-size: 14px;
  color: var(--ky-cyan);
  border: 2px solid var(--ky-cyan);
  border-radius: var(--ky-radius);
}

.page-about .about-support__step:nth-child(3) .about-support__no {
  color: var(--ky-amber);
  border-color: var(--ky-amber);
}

.page-about .about-support__step h3 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.35;
  color: var(--ky-white);
}

.page-about .about-support__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ky-body);
}

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

.page-about .about-support__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 2px solid var(--ky-line);
  border-radius: var(--ky-radius);
}

.page-about .about-support__contact {
  padding: 20px 22px;
  background: var(--ky-cyan-dim);
  border: 2px solid rgba(51, 240, 210, .34);
  border-radius: var(--ky-radius);
}

.page-about .about-support__contact-label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--ky-cyan);
}

.page-about .about-support__contact-line {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ky-body);
}

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

/* ---------- 认证与地区 ---------- */
.page-about .about-legal {
  margin-top: 32px;
  display: grid;
  gap: 22px;
  align-items: start;
}

.page-about .about-legal__seal {
  position: relative;
  display: grid;
  justify-items: start;
  gap: 6px;
  padding: 26px 22px 24px;
  background: var(--ky-indigo);
  border: 2px solid var(--ky-blue);
  border-radius: var(--ky-radius);
  box-shadow: var(--ky-shadow);
  clip-path: polygon(0 0, 100% 6%, 100% 100%, 0 94%);
}

.page-about .about-legal__seal-ver {
  font-size: 56px;
  line-height: 1;
  color: var(--ky-white);
  letter-spacing: .02em;
}

.page-about .about-legal__seal-name {
  font-size: 15px;
  letter-spacing: .16em;
  color: var(--ky-cyan);
}

.page-about .about-legal__seal-dot {
  margin-top: 12px;
  width: 42px;
  height: 2px;
  background: var(--ky-amber);
}

.page-about .about-legal__list {
  margin: 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 18px;
}

.page-about .about-legal__list dt {
  padding-top: 14px;
  border-top: 1px solid var(--ky-line);
  font-size: 13px;
  color: var(--ky-mist);
  align-self: start;
}

.page-about .about-legal__list dd {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--ky-line);
  font-size: 15px;
  line-height: 1.7;
  color: var(--ky-body);
}

.page-about .about-legal__tail {
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ky-mist);
}

.page-about .about-legal__tail a {
  color: var(--ky-blue-lt);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: calc(var(--ky-header-h) + 44px) 0 78px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
    margin-top: 44px;
  }

  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: var(--ab-flow-gap);
    align-items: start;
    padding: 72px 0 96px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--ky-header-h) + 28px);
    align-self: start;
  }

  .page-about .about-rail__label {
    margin: 0 0 14px;
    font-size: 11px;
    letter-spacing: .2em;
    color: var(--ky-mist);
  }

  .page-about .about-sec + .about-sec {
    margin-top: 88px;
  }

  .page-about .about-cap {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-cap__card--wide {
    grid-column: span 7;
  }

  .page-about .about-cap__card--narrow {
    grid-column: span 5;
  }

  .page-about .about-data__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-support {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 26px 32px;
    align-items: start;
  }

  .page-about .about-support__steps {
    grid-column: 1;
  }

  .page-about .about-support__contact {
    grid-column: 1;
  }

  .page-about .about-support__media {
    grid-column: 2;
    grid-row: 1 / span 2;
    position: sticky;
    top: calc(var(--ky-header-h) + 32px);
  }

  .page-about .about-legal {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 40px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-data__cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 520px) {
  .page-about .about-hero__lead .ky-title-xl {
    font-size: clamp(32px, 10vw, 44px);
  }

  .page-about .about-stats__num {
    min-width: 62px;
    font-size: 22px;
  }

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

  .page-about .about-legal__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .page-about .about-legal__list dt {
    padding-top: 16px;
    border-top: 0;
  }

  .page-about .about-legal__list dd {
    padding-top: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__node,
  .page-about .about-timeline__card,
  .page-about .about-cap__card,
  .page-about .about-data__card {
    transition: none;
  }
}