.page-about {
  --about-block: clamp(56px, 9vw, 108px);
  --about-track: rgba(192, 138, 62, .45);
  --about-hair: rgba(18, 22, 31, .1);
  background: var(--ky-indigo);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .ky-section {
  padding: var(--about-block) 0;
}

/* ---------- 左侧章节标尺 ---------- */
.page-about .about-rail {
  display: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 6vw, 72px) 0 clamp(52px, 8vw, 96px);
  color: var(--ky-paper);
  background:
    radial-gradient(90% 70% at 88% 0%, rgba(47, 191, 176, .16), transparent 62%),
    radial-gradient(70% 60% at 6% 100%, rgba(192, 138, 62, .18), transparent 60%),
    linear-gradient(180deg, var(--ky-indigo) 0%, var(--ky-indigo-deep) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--about-track);
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__crumb,
.page-about .about-hero__crumb a {
  color: rgba(246, 242, 233, .7);
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--ky-copper-light);
}

.page-about .about-hero__kicker {
  color: var(--ky-copper-light);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 18em;
  font-family: var(--ky-font-display);
  font-weight: 800;
  font-size: clamp(32px, 6vw, 76px);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: #fff;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 42rem;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.9;
  color: rgba(246, 242, 233, .86);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 10px;
  padding: 12px 20px;
  border: 1px solid var(--about-track);
  border-radius: var(--ky-radius-pill);
  background: rgba(22, 38, 77, .52);
}

.page-about .about-hero__stats .ky-num {
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 600;
  color: var(--ky-copper-light);
}

.page-about .about-hero__stats em {
  font-style: normal;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(246, 242, 233, .68);
}

/* ---------- 章节标题 ---------- */
.page-about .about-head {
  max-width: 46rem;
  margin-bottom: clamp(30px, 5vw, 60px);
}

.page-about .about-head .ky-h2 {
  margin: 14px 0 0;
  font-family: var(--ky-font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.6vw, 44px);
  line-height: 1.24;
  letter-spacing: -.01em;
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  font-size: clamp(16px, 1.5vw, 17px);
  line-height: 1.9;
  opacity: .84;
}

.page-about .about-head--dark .ky-kicker {
  color: var(--ky-copper-light);
}

.page-about .about-head--dark .about-head__lede {
  opacity: 1;
  color: rgba(246, 242, 233, .78);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__rail {
  position: relative;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-timeline__rail::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 46px;
  bottom: 28px;
  width: 1px;
  background: linear-gradient(180deg, var(--ky-copper) 0%, rgba(192, 138, 62, .14) 100%);
}

.page-about .about-node {
  position: relative;
  padding-left: 44px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid var(--ky-copper);
  background: var(--ky-paper);
  box-shadow: 0 0 0 4px rgba(192, 138, 62, .14);
  transition: background .3s var(--ky-ease), border-color .3s var(--ky-ease);
}

.page-about .about-node[open]::before {
  background: var(--ky-cyan);
  border-color: var(--ky-cyan);
}

.page-about .about-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding: 22px 0 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__head:focus-visible {
  outline: 2px solid var(--ky-cyan);
  outline-offset: 4px;
  border-radius: 6px;
}

.page-about .about-node__mark {
  flex: 0 0 auto;
  font-size: clamp(16px, 1.6vw, 18px);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--ky-indigo);
}

.page-about .about-node__label {
  flex: 1 1 auto;
  font-size: clamp(17px, 1.8vw, 19px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--ky-ink);
}

.page-about .about-node__chev {
  flex: 0 0 auto;
  align-self: center;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--ky-copper);
  border-bottom: 2px solid var(--ky-copper);
  transform: rotate(45deg);
  transition: transform .3s var(--ky-ease);
}

.page-about .about-node[open] .about-node__chev {
  transform: rotate(-135deg);
}

.page-about .about-node__body {
  max-width: 46rem;
  padding: 0 0 26px;
  font-size: 16px;
  line-height: 1.88;
  color: rgba(18, 22, 31, .78);
}

.page-about .about-node__body p {
  margin: 0;
}

.page-about .about-node__body a {
  color: var(--ky-indigo);
  text-decoration: underline;
  text-decoration-color: var(--ky-copper);
  text-underline-offset: 4px;
}

.page-about .about-node__body a:hover {
  color: var(--ky-copper);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-team__body > p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(18, 22, 31, .78);
}

.page-about .about-tiers {
  list-style: none;
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-tier {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-tier__size {
  flex: 0 0 auto;
  min-width: 8em;
  font-size: 15px;
  font-weight: 600;
  color: var(--ky-indigo);
}

.page-about .about-tier__desc {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(18, 22, 31, .72);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure .about-figure__frame {
  border-radius: var(--ky-radius-card);
  overflow: hidden;
  background: rgba(14, 27, 58, .06);
}

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

.page-about .about-figure .ky-figure__cap {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(18, 22, 31, .62);
}

.page-about .about-figure--dark .ky-figure__cap {
  color: rgba(246, 242, 233, .68);
}

.page-about .about-figure--dark .about-figure__frame {
  background: rgba(22, 38, 77, .6);
}

/* ---------- 资质 ---------- */
.page-about .about-cert {
  color: var(--ky-paper);
}

.page-about .about-cert__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

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

.page-about .about-cert__item {
  position: relative;
  padding: clamp(22px, 3vw, 30px);
  border: 1px solid var(--about-track);
  border-radius: var(--ky-radius-card);
  background: rgba(22, 38, 77, .62);
}

.page-about .about-cert__item::before {
  content: "";
  position: absolute;
  left: 26px;
  top: -1px;
  width: 48px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--ky-copper);
}

.page-about .about-cert__name {
  margin: 0;
  font-family: var(--ky-font-display);
  font-size: clamp(19px, 2vw, 22px);
  font-weight: 700;
  color: #fff;
}

.page-about .about-cert__desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(246, 242, 233, .78);
}

/* ---------- 伙伴横向滚动 ---------- */
.page-about .about-scroller {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 4px 0 22px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}

.page-about .about-scroller:focus-visible {
  outline: 2px solid var(--ky-cyan);
  outline-offset: 6px;
}

.page-about .about-scroller__track {
  list-style: none;
  margin: 0;
  padding: 0 var(--ky-gutter);
  display: flex;
  align-items: stretch;
  gap: 18px;
  width: max-content;
}

.page-about .about-card {
  flex: 0 0 auto;
  width: clamp(228px, 66vw, 296px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 24px;
  border: 1px solid var(--about-hair);
  border-radius: var(--ky-radius-card);
  background: var(--ky-cloud);
  transition: transform .3s var(--ky-ease), box-shadow .3s var(--ky-ease);
}

.page-about .about-card__num {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ky-indigo);
}

.page-about .about-card__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ky-ink);
}

.page-about .about-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(18, 22, 31, .7);
}

/* ---------- 服务版图 ---------- */
.page-about .about-coverage {
  color: var(--ky-paper);
}

.page-about .about-coverage__figurewrap {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-coverage__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-coverage__stats li {
  padding: 24px;
  border: 1px solid var(--about-track);
  border-radius: var(--ky-radius-card);
  background: rgba(22, 38, 77, .55);
}

.page-about .about-coverage__stats .ky-num {
  display: block;
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ky-cyan);
}

.page-about .about-coverage__stats li > span:not(.ky-num) {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  letter-spacing: .03em;
  color: rgba(246, 242, 233, .74);
}

/* ---------- 联系 ---------- */
.page-about .about-contact__inner {
  max-width: 52rem;
}

.page-about .about-contact__lede {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(18, 22, 31, .76);
}

.page-about .about-contact__list {
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-contact__row dt {
  flex: 0 0 5.5em;
  font-size: 13px;
  letter-spacing: .08em;
  color: rgba(18, 22, 31, .58);
}

.page-about .about-contact__row dd {
  flex: 1 1 60%;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ky-ink);
}

.page-about .about-contact__cta {
  margin-top: clamp(26px, 4vw, 38px);
  background: var(--ky-indigo);
  border-color: var(--ky-indigo);
  color: var(--ky-paper);
}

.page-about .about-contact__cta:hover,
.page-about .about-contact__cta:focus-visible {
  background: var(--ky-indigo-deep);
  border-color: var(--ky-indigo-deep);
  color: #fff;
}

/* ---------- 平板 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

  .page-about .about-cert__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    align-items: center;
  }
}

/* ---------- 窄屏 ---------- */
@media (max-width: 520px) {
  .page-about .about-tier {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

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

  .page-about .about-node {
    padding-left: 34px;
  }

  .page-about .about-node::before {
    width: 12px;
    height: 12px;
  }

  .page-about .about-contact__row dt {
    flex: 0 0 100%;
  }

  .page-about .about-contact__row dd {
    flex: 1 1 100%;
  }
}

/* ---------- 桌面宽屏章节标尺 ---------- */
@media (min-width: 1440px) {
  .page-about .about-rail {
    display: block;
    position: fixed;
    left: 22px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    padding: 18px 16px;
    border: 1px solid rgba(192, 138, 62, .32);
    border-radius: var(--ky-radius-pill);
    background: rgba(14, 27, 58, .86);
    backdrop-filter: blur(8px);
  }

  .page-about .about-rail ol {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 10px;
  }

  .page-about .about-rail a {
    display: block;
    padding-left: 10px;
    border-left: 2px solid transparent;
    font-size: 12px;
    line-height: 1.4;
    letter-spacing: .06em;
    color: rgba(246, 242, 233, .62);
    text-decoration: none;
    transition: color .25s var(--ky-ease), border-color .25s var(--ky-ease);
  }

  .page-about .about-rail a:hover,
  .page-about .about-rail a:focus-visible {
    color: var(--ky-copper-light);
    border-left-color: var(--ky-copper);
  }
}

@media (hover: hover) and (pointer: fine) {
  .page-about .about-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--ky-shadow);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-node::before,
  .page-about .about-node__chev,
  .page-about .about-rail a {
    transition: none;
  }

  .page-about .about-card:hover {
    transform: none;
  }
}