/* =========================================================
   发展历程页 · page-about
   ========================================================= */
.page-about {
  --tl-col: 132px;
  --tl-gap: 28px;
  background: var(--gray-050);
  color: var(--text-900);
  font-family: var(--font-sans);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: calc(var(--bar-h) + 44px) 0 56px;
  background:
    radial-gradient(120% 88% at 84% 0%, rgba(0, 87, 184, .58) 0%, rgba(0, 87, 184, 0) 58%),
    var(--ink-950);
  color: #ffffff;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(168, 201, 238, .09) 0 1px,
    transparent 1px 72px
  );
}

.page-about .about-hero__crumb {
  margin-bottom: 30px;
  color: rgba(255, 255, 255, .66);
  font-size: 13px;
}

.page-about .about-hero__crumb a {
  color: rgba(255, 255, 255, .8);
  text-decoration: none;
}

.page-about .about-hero__crumb a:hover {
  color: #ffffff;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 40px;
}

.page-about .about-hero__eyebrow {
  color: var(--blue-200);
}

.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-size: clamp(30px, 8vw, 58px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.page-about .about-hero__sub {
  margin: 0 0 30px;
  max-width: 560px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .76);
}

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

/* 首屏概况面板 */
.page-about .about-hero__panel {
  border: 1px solid rgba(168, 201, 238, .26);
  border-radius: var(--radius-m);
  padding: 22px 22px 18px;
  background: linear-gradient(165deg, rgba(0, 87, 184, .26) 0%, rgba(7, 12, 20, .52) 78%);
}

.page-about .about-hero__panel-title {
  margin: 0 0 18px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--blue-200);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: 0;
}

.page-about .about-hero__stat {
  padding-left: 12px;
  border-left: 2px solid var(--blue-600);
}

.page-about .about-hero__stat dt {
  margin-bottom: 5px;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(255, 255, 255, .58);
}

.page-about .about-hero__stat dd {
  margin: 0;
  font-size: 22px;
  font-weight: 500;
  letter-spacing: .02em;
  color: #ffffff;
}

/* ---------- 通用小节 ---------- */
.page-about .section {
  padding: 56px 0;
}

/* ---------- 时间线 ---------- */
.page-about .about-journey {
  background: var(--gray-050);
}

.page-about .tl {
  position: relative;
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.page-about .tl__node {
  position: relative;
  padding: 26px 0;
  border-top: 1px solid var(--gray-200);
}

.page-about .tl__node:first-child {
  border-top: 0;
}

.page-about .tl__mark {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .tl__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 32px;
  padding: 0 8px;
  border-radius: var(--radius-s);
  background: var(--blue-600);
  color: #ffffff;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .1em;
}

.page-about .tl__stage {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--gray-600);
}

.page-about .tl__title {
  margin: 0 0 14px;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.36;
  letter-spacing: -0.01em;
  color: var(--text-900);
}

.page-about .tl__text {
  margin: 0;
  max-width: 640px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--text-900);
}

.page-about .tl__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .tl__foot {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray-600);
}

.page-about .tl__foot a,
.page-about .next-foot a {
  color: var(--blue-600);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--blue-200);
}

.page-about .tl__foot a:hover,
.page-about .next-foot a:hover {
  color: var(--blue-700);
  border-bottom-color: var(--blue-600);
}

/* 图片框 */
.page-about .about-shot {
  margin: 24px 0 0;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-m);
  background: var(--blue-050);
  overflow: hidden;
}

.page-about .about-shot--square {
  max-width: 420px;
}

/* ---------- 覆盖点阵 ---------- */
.page-about .dotmap {
  margin-top: 24px;
  padding: 20px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-m);
  background: #ffffff;
}

.page-about .dotmap__cap {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gray-600);
}

.page-about .dotmap__grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
  max-width: 340px;
}

.page-about .dotmap__dot {
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: var(--blue-200);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .dotmap__dot:hover,
.page-about .dotmap__dot:focus-visible {
  background: var(--blue-600);
  transform: scale(1.4);
}

.page-about .dotmap__dot--hub {
  background: var(--orange-500);
  box-shadow: 0 0 0 3px var(--orange-100);
}

.page-about .dotmap__dot--hub:hover,
.page-about .dotmap__dot--hub:focus-visible {
  background: var(--orange-500);
  transform: scale(1.5);
}

.page-about .dotmap__legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 16px;
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray-600);
}

.page-about .dotmap__key {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 6px;
  border-radius: 50%;
  background: var(--blue-200);
  vertical-align: middle;
}

.page-about .dotmap__key--hub {
  background: var(--orange-500);
}

/* ---------- 条款标签页 ---------- */
.page-about .ver-tabs {
  margin-top: 24px;
  padding: 16px 18px 18px;
  border: 1px solid var(--gray-200);
  border-left: 3px solid var(--blue-600);
  border-radius: var(--radius-m);
  background: #ffffff;
}

.page-about .ver-tabs__btn {
  margin: 0 6px 10px 0;
  font-size: 12px;
  letter-spacing: .1em;
}

.page-about .ver-tabs__panel {
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px dashed var(--gray-200);
}

.page-about .ver-tabs__panel:first-of-type {
  border-top: 0;
  padding-top: 4px;
}

.page-about .ver-tabs__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray-600);
}

/* ---------- 团队分工 ---------- */
.page-about .tree {
  margin-top: 26px;
}

.page-about .tree__root {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-radius: var(--radius-s);
  background: var(--ink-950);
  color: #ffffff;
}

.page-about .tree__root-name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
}

.page-about .tree__root-num {
  padding-left: 12px;
  border-left: 1px solid rgba(255, 255, 255, .24);
  font-size: 13px;
  color: var(--blue-200);
}

.page-about .tree__branches {
  display: grid;
  gap: 14px;
  margin: 22px 0 0;
  padding: 0 0 0 20px;
  list-style: none;
  border-left: 2px solid var(--blue-200);
}

.page-about .tree__branch {
  position: relative;
  padding: 16px 18px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-m);
  background: #ffffff;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tree__branch::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 26px;
  width: 20px;
  height: 2px;
  background: var(--blue-200);
  transition: background-color var(--dur) var(--ease);
}

.page-about .tree__branch:hover,
.page-about .tree__branch:focus-within {
  border-color: var(--blue-600);
  box-shadow: var(--shadow-1);
}

.page-about .tree__branch:hover::before,
.page-about .tree__branch:focus-within::before {
  background: var(--orange-500);
}

.page-about .tree__name {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-900);
}

.page-about .tree__name .mono {
  font-size: 15px;
  color: var(--blue-600);
}

.page-about .tree__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gray-600);
}

/* ---------- 资质与生态 ---------- */
.page-about .about-trust {
  background: linear-gradient(180deg, var(--blue-050) 0%, var(--gray-050) 100%);
}

.page-about .trust-grid {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .trust-card {
  padding: 24px 22px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-m);
  background: #ffffff;
}

.page-about .trust-card__tag {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--blue-600);
}

.page-about .trust-card__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-900);
}

.page-about .trust-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray-600);
}

.page-about .trust-card--media {
  padding: 0;
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .trust-card--media img {
  width: 100%;
  height: auto;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--gray-050);
}

.page-about .next-list {
  display: grid;
  gap: 16px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .next-item {
  position: relative;
  padding: 22px 22px 22px 24px;
  border: 1px solid var(--gray-200);
  border-left: 3px solid var(--blue-600);
  border-radius: var(--radius-m);
  background: #ffffff;
  transition: border-left-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .next-item:hover {
  border-left-color: var(--orange-500);
  box-shadow: var(--shadow-1);
}

.page-about .next-item__idx {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gray-600);
}

.page-about .next-item__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-900);
}

.page-about .next-item__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray-600);
}

.page-about .next-foot {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray-600);
}

/* ---------- 联系 ---------- */
.page-about .about-cta {
  background: var(--ink-950);
  color: #ffffff;
}

.page-about .about-cta__box {
  display: grid;
  gap: 34px;
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 5.4vw, 38px);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.page-about .about-cta__lead {
  margin: 0 0 26px;
  max-width: 520px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .74);
}

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

.page-about .about-cta__info {
  display: grid;
  gap: 16px;
  margin: 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, .14);
}

.page-about .about-cta__info dt {
  margin-bottom: 5px;
  font-size: 12px;
  letter-spacing: .14em;
  color: rgba(255, 255, 255, .5);
}

.page-about .about-cta__info dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(255, 255, 255, .9);
  overflow-wrap: anywhere;
}

/* ---------- 平板 ---------- */
@media (min-width: 760px) {
  .page-about .section {
    padding: 76px 0;
  }

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

  .page-about .trust-card--media {
    grid-column: 1 / -1;
  }

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

  .page-about .dotmap__grid {
    grid-template-columns: repeat(13, minmax(0, 1fr));
    max-width: 460px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero {
    padding: calc(var(--bar-h) + 64px) 0 84px;
  }

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

  .page-about .about-hero__panel {
    padding: 28px 26px 24px;
  }

  .page-about .section {
    padding: 92px 0;
  }

  .page-about .tl {
    margin-top: 20px;
  }

  .page-about .tl::before {
    content: "";
    position: absolute;
    left: calc(var(--tl-col) + 14px);
    top: 24px;
    bottom: 24px;
    width: 2px;
    background: linear-gradient(180deg, var(--blue-200) 0%, var(--blue-200) 72%, rgba(168, 201, 238, 0) 100%);
  }

  .page-about .tl__node {
    display: grid;
    grid-template-columns: var(--tl-col) minmax(0, 1fr);
    gap: var(--tl-gap);
    padding: 46px 0;
  }

  .page-about .tl__node:first-child {
    padding-top: 28px;
  }

  .page-about .tl__node::after {
    content: "";
    position: absolute;
    left: calc(var(--tl-col) + 14px);
    top: 56px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #ffffff;
    border: 2px solid var(--blue-600);
    transform: translateX(-50%);
  }

  .page-about .tl__node:first-child::after {
    top: 38px;
  }

  .page-about .tl__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 0;
    padding-top: 4px;
  }

  .page-about .tl__title {
    font-size: 26px;
  }

  .page-about .about-cta__box {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-cta__info {
    padding-top: 0;
    border-top: 0;
  }
}

@media (min-width: 1100px) {
  .page-about {
    --tl-col: 160px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .dotmap__dot,
  .page-about .tree__branch,
  .page-about .tree__branch::before,
  .page-about .next-item {
    transition: none;
  }

  .page-about .dotmap__dot:hover,
  .page-about .dotmap__dot:focus-visible {
    transform: none;
  }
}
<<<END>>>