.page-about {
  --ab-axis-x: 10px;
  --ab-rail-w: 224px;
  background: var(--sky-900);
  color: var(--ice-050);
  font-family: var(--font-head);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 24px 0 42px;
  background:
    radial-gradient(120% 92% at 84% -12%, rgba(60, 123, 255, .30), transparent 62%),
    radial-gradient(84% 72% at 4% 0%, rgba(47, 242, 213, .15), transparent 60%),
    var(--sky-900);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--sky-600) 14%, var(--sky-600) 86%, transparent);
}

.page-about .ab-hero .crumb {
  margin-bottom: 26px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .ab-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(31px, 7vw, 56px);
  font-weight: 250;
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--ice-050);
}

.page-about .ab-hero__sub {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ice-300);
}

.page-about .ab-hero__actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 首屏数据面板 */
.page-about .ab-hero__panel {
  position: relative;
  padding: 22px 20px 20px;
  border: 1px solid var(--sky-600);
  border-radius: var(--r-xl);
  background: linear-gradient(160deg, rgba(20, 32, 72, .95), rgba(12, 21, 51, .82));
  overflow: hidden;
}

.page-about .ab-hero__panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan-500), rgba(60, 123, 255, .55) 45%, transparent);
}

.page-about .ab-panel__cap {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--cyan-500);
}

.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding-top: 12px;
  border-top: 1px solid var(--sky-600);
}

.page-about .ab-stat__num {
  display: flex;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 29px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-500);
}

.page-about .ab-stat__suffix {
  font-style: normal;
  font-size: 15px;
  font-weight: 500;
  color: var(--cyan-300);
  margin-left: 2px;
}

.page-about .ab-stat__unit {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ice-300);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-body {
  padding: 12px 0 64px;
}

.page-about .ab-body__grid {
  display: grid;
  gap: 26px;
}

/* 章节索引：移动端为横向胶囊条 */
.page-about .ab-rail {
  position: sticky;
  top: var(--head-h-sm);
  z-index: 6;
  padding: 10px 0 8px;
  background: linear-gradient(180deg, var(--sky-900) 76%, rgba(6, 11, 31, 0));
}

.page-about .ab-rail__cap {
  display: none;
}

.page-about .ab-rail__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 2px 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--sky-600);
  border-radius: var(--r-pill);
  background: rgba(12, 21, 51, .92);
  color: var(--ice-300);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .ab-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan-500);
}

.page-about .ab-rail__link:hover {
  border-color: var(--cyan-500);
  color: var(--ice-050);
}

.page-about .ab-rail__link[aria-current="true"] {
  border-color: var(--cyan-500);
  background: rgba(47, 242, 213, .10);
  color: var(--ice-050);
  box-shadow: inset 0 0 0 1px rgba(47, 242, 213, .22);
}

/* 章节 */
.page-about .ab-flow {
  display: grid;
  gap: 54px;
}

.page-about .ab-sec {
  position: relative;
  scroll-margin-top: 156px;
}

.page-about .ab-sec__head {
  margin: 0 0 18px;
}

.page-about .ab-sec__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(38px, 9vw, 56px);
  font-weight: 700;
  line-height: .9;
  letter-spacing: .02em;
  color: var(--sky-700-hi);
  transition: color .3s var(--ease);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .ab-sec__no {
    color: transparent;
    -webkit-text-stroke: 1px var(--sky-600);
  }
}

.page-about .ab-sec.is-in .ab-sec__no {
  color: var(--cyan-500);
  -webkit-text-stroke: 0;
}

.page-about .ab-sec__title {
  margin: 0;
  max-width: 22em;
  font-size: clamp(23px, 4.6vw, 36px);
  font-weight: 250;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--ice-050);
}

.page-about .ab-sec__body {
  display: grid;
  gap: 16px;
  max-width: 38em;
}

.page-about .ab-sec__body p {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--ice-300);
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-cov {
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .ab-regions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-region {
  padding: 14px 16px;
  border: 1px solid var(--sky-600);
  border-radius: var(--r-md);
  background: rgba(20, 32, 72, .55);
  transition: border-color .18s var(--ease), transform .18s var(--ease), background .18s var(--ease);
}

.page-about .ab-region:hover {
  border-color: var(--cyan-500);
  background: rgba(20, 32, 72, .92);
  transform: translateY(-2px);
}

.page-about .ab-region__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 6px;
}

.page-about .ab-region__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ice-050);
}

.page-about .ab-region__count {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan-500);
}

.page-about .ab-region__count .unit {
  margin-left: 4px;
  font-family: var(--font-head);
  font-size: 11px;
  color: var(--ice-300);
}

.page-about .ab-region__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ice-300);
}

.page-about .ab-cov__fig,
.page-about .ab-team__fig {
  margin: 0;
}

.page-about .ab-cov__fig .figure__media,
.page-about .ab-team__fig .figure__media {
  overflow: hidden;
  border: 1px solid var(--sky-600);
  border-radius: var(--r-lg);
  background: var(--sky-700);
}

.page-about .ab-cov__fig img,
.page-about .ab-team__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--ice-300);
}

/* ---------- 更新节奏 ---------- */
.page-about .ab-timing {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-tick {
  padding: 20px 18px;
  border: 1px solid var(--sky-600);
  border-radius: var(--r-lg);
  background: linear-gradient(165deg, rgba(20, 32, 72, .9), rgba(12, 21, 51, .6));
  transition: transform .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-tick:hover {
  transform: translateY(-3px);
  border-color: var(--cyan-500);
}

.page-about .ab-tick__num {
  display: flex;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 33px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange-500);
}

.page-about .ab-tick--cyan .ab-tick__num {
  color: var(--cyan-500);
}

.page-about .ab-tick__suffix {
  margin-left: 2px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 500;
  color: var(--ice-300);
}

.page-about .ab-tick__label {
  margin: 14px 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ice-050);
}

.page-about .ab-tick__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ice-300);
}

.page-about .ab-fields {
  margin-top: 20px;
  padding: 18px 18px 20px;
  border: 1px dashed var(--sky-600);
  border-radius: var(--r-lg);
}

.page-about .ab-fields__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--cyan-500);
}

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

.page-about .ab-fields li {
  padding: 6px 12px;
  border: 1px solid rgba(47, 242, 213, .28);
  border-radius: var(--r-pill);
  background: rgba(47, 242, 213, .08);
  font-size: 13px;
  color: var(--ice-050);
}

/* ---------- 发展阶段 ---------- */
.page-about .ab-sec--miles {
  position: relative;
  overflow: hidden;
  padding-bottom: 6px;
}

.page-about .ab-miles__bg {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: auto;
  max-height: 240px;
  object-fit: cover;
  opacity: .22;
  pointer-events: none;
  z-index: 0;
  -webkit-mask-image: linear-gradient(90deg, rgba(0, 0, 0, .95), transparent 88%);
  mask-image: linear-gradient(90deg, rgba(0, 0, 0, .95), transparent 88%);
}

.page-about .ab-sec--miles > .ab-sec__head,
.page-about .ab-sec--miles > .ab-sec__body,
.page-about .ab-sec--miles > .ab-miles {
  position: relative;
  z-index: 1;
}

.page-about .ab-miles {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-mile {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border: 1px solid var(--sky-600);
  border-radius: var(--r-lg);
  background: rgba(12, 21, 51, .74);
  outline-offset: 3px;
  transition: border-color .2s var(--ease), transform .2s var(--ease), background .2s var(--ease);
}

.page-about .ab-mile:hover,
.page-about .ab-mile:focus-visible {
  border-color: var(--cyan-500);
  background: rgba(20, 32, 72, .96);
  transform: translateX(4px);
}

.page-about .ab-mile:focus-visible {
  outline: 2px solid var(--orange-500);
  outline-offset: 3px;
}

.page-about .ab-mile__no {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--ice-300);
  transition: color .25s var(--ease);
}

.page-about .ab-mile.is-in .ab-mile__no {
  color: var(--cyan-500);
}

.page-about .ab-mile__title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ice-050);
}

.page-about .ab-mile__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ice-300);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}

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

.page-about .ab-member {
  padding: 20px 20px 18px;
  border: 1px solid var(--sky-600);
  border-radius: var(--r-lg);
  background: rgba(20, 32, 72, .6);
  transition: border-color .2s var(--ease), transform .2s var(--ease), background .2s var(--ease);
}

.page-about .ab-member:hover {
  border-color: var(--cyan-500);
  background: rgba(20, 32, 72, .95);
  transform: translateY(-3px);
}

.page-about .ab-member__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .ab-member__name {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ice-050);
}

.page-about .ab-member__num {
  font-family: var(--font-mono);
  font-size: 25px;
  font-weight: 700;
  color: var(--orange-500);
}

.page-about .ab-member__num .unit {
  margin-left: 2px;
  font-family: var(--font-head);
  font-size: 12px;
  color: var(--ice-300);
}

.page-about .ab-member__desc {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--ice-300);
}

.page-about .ab-member__tags {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-member__tags li {
  padding: 4px 10px;
  border: 1px solid var(--sky-600);
  border-radius: var(--r-pill);
  font-size: 12px;
  color: var(--ice-300);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-member:hover .ab-member__tags li {
  color: var(--cyan-300);
  border-color: rgba(47, 242, 213, .42);
}

/* ---------- 合作与认可 ---------- */
.page-about .ab-partners {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-partner {
  padding: 20px 18px;
  border: 1px solid var(--sky-600);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(20, 32, 72, .86), rgba(12, 21, 51, .5));
  transition: border-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .ab-partner:hover {
  border-color: var(--cyan-500);
  transform: translateY(-2px);
}

.page-about .ab-partner__num {
  display: flex;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-500);
}

.page-about .ab-partner__num .unit {
  margin-left: 4px;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 500;
  color: var(--ice-300);
}

.page-about .ab-partner__label {
  margin: 12px 0 6px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ice-050);
}

.page-about .ab-partner__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ice-300);
}

/* ---------- 结尾行动区 ---------- */
.page-about .ab-cta {
  position: relative;
  padding: 44px 0 56px;
  background: linear-gradient(180deg, var(--sky-900), var(--sky-800));
  border-top: 1px solid var(--sky-600);
}

.page-about .ab-cta__inner {
  display: grid;
  gap: 22px;
}

.page-about .ab-cta__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 250;
  letter-spacing: -.01em;
  color: var(--ice-050);
}

.page-about .ab-cta__text p {
  margin: 0;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ice-300);
}

.page-about .ab-cta__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-cov__fig,
  .page-about .ab-team__fig {
    max-width: 560px;
  }
}

@media (min-width: 700px) {
  .page-about .ab-regions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .ab-mile {
    grid-template-columns: 64px minmax(0, 190px) minmax(0, 1fr);
    align-items: baseline;
    gap: 8px 18px;
  }

  .page-about .ab-mile:hover,
  .page-about .ab-mile:focus-visible {
    transform: translateX(6px);
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 30px 0 56px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, .78fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }

  .page-about .ab-cta__links {
    justify-content: flex-end;
    flex-wrap: nowrap;
  }
}

@media (min-width: 940px) {
  .page-about .ab-body {
    padding: 24px 0 88px;
  }

  .page-about .ab-body__grid {
    position: relative;
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .ab-body__grid::before {
    content: "";
    position: absolute;
    left: var(--ab-axis-x);
    top: 4px;
    bottom: 4px;
    width: 1px;
    background: linear-gradient(180deg, transparent, var(--sky-600) 5%, var(--sky-600) 95%, transparent);
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--head-h) + 28px);
    padding: 2px 0 2px 32px;
    background: none;
  }

  .page-about .ab-rail__cap {
    display: block;
    margin: 0 0 16px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .2em;
    color: var(--ice-300);
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 2px;
    padding: 0;
    overflow: visible;
  }

  .page-about .ab-rail__link {
    position: relative;
    display: block;
    padding: 10px 0;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: 14px;
    line-height: 1.5;
  }

  .page-about .ab-rail__link::before {
    content: "";
    position: absolute;
    left: -25px;
    top: 17px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--sky-600);
    transition: background .2s var(--ease), box-shadow .2s var(--ease), transform .2s var(--ease);
  }

  .page-about .ab-rail__link:hover::before {
    background: var(--cyan-300);
  }

  .page-about .ab-rail__link:hover {
    border: 0;
    background: none;
  }

  .page-about .ab-rail__link[aria-current="true"] {
    background: none;
    box-shadow: none;
    color: var(--cyan-300);
  }

  .page-about .ab-rail__link[aria-current="true"]::before {
    background: var(--cyan-500);
    transform: scale(1.3);
    box-shadow: 0 0 0 4px rgba(47, 242, 213, .16);
  }

  .page-about .ab-flow {
    gap: 84px;
  }

  .page-about .ab-sec {
    scroll-margin-top: calc(var(--head-h) + 40px);
  }

  .page-about .ab-cov {
    margin-top: 30px;
  }

  .page-about .ab-team {
    margin-top: 30px;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-cov {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 42px;
    align-items: start;
  }

  .page-about .ab-cov__fig {
    max-width: none;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-team__fig {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
  }
}