.page-about {
  --ab-toc-w: 218px;
  --ab-gap: clamp(44px, 6vw, 92px);
  background-color: var(--c-base);
  background-image:
    linear-gradient(rgba(199, 208, 228, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(199, 208, 228, 0.045) 1px, transparent 1px);
  background-size: 96px 96px;
  color: var(--c-white);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  border-bottom: 1px solid var(--line);
  padding-block: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(34px, 5.5vw, 68px);
  border-bottom: 1px solid var(--line-strong);
  background:
    radial-gradient(120% 140% at 88% -25%, rgba(43, 224, 232, 0.22) 0%, rgba(43, 224, 232, 0) 56%),
    linear-gradient(160deg, var(--c-panel) 0%, var(--c-base) 74%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -42%;
  width: 58%;
  height: 152%;
  background: linear-gradient(200deg, rgba(123, 108, 255, 0.18), rgba(43, 224, 232, 0.04));
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-hero__main {
  min-width: 0;
}

.page-about .ab-hero h1 {
  margin: 0.4em 0 0.7em;
  font-size: clamp(29px, 5vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--c-white);
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--c-silver);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero__panel {
  background: var(--c-panel-hi);
  border: 2px solid var(--c-ink);
  box-shadow: var(--shadow-hard);
  padding: 18px 20px 22px;
}

.page-about .ab-hero__panel-title {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
}

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

.page-about .ab-facts li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.75em;
  align-items: baseline;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.page-about .ab-facts li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-facts__num {
  font-size: 22px;
  font-weight: 900;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .ab-facts__label {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--c-silver);
}

/* ---------- 双栏布局 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  padding-block: var(--ab-gap) clamp(48px, 6vw, 88px);
}

.page-about .ab-toc {
  border: 1px solid var(--line);
  background: rgba(18, 26, 68, 0.6);
  padding: 16px 14px;
}

.page-about .ab-toc__title {
  margin: 0 0 12px;
  padding-left: 12px;
  border-left: 2px solid var(--c-cyan);
  font-size: 11px;
  letter-spacing: 0.18em;
  line-height: 1.4;
  color: var(--c-silver);
}

.page-about .ab-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-toc__list a {
  display: grid;
  grid-template-columns: 2.2em minmax(0, 1fr);
  gap: 0.5em;
  align-items: baseline;
  padding: 8px 10px 8px 12px;
  border-left: 2px solid var(--line);
  color: var(--c-silver);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.55;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .ab-toc__list a:hover {
  color: var(--c-white);
  border-left-color: var(--c-cyan);
  background: rgba(43, 224, 232, 0.07);
}

.page-about .ab-toc__list a[aria-current="true"] {
  color: var(--c-cyan);
  border-left-color: var(--c-cyan);
  background: rgba(43, 224, 232, 0.1);
}

.page-about .ab-toc__list a:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}

.page-about .ab-body {
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .ab-sec {
  margin-bottom: clamp(38px, 4.6vw, 66px);
  scroll-margin-top: 96px;
}

.page-about .ab-sec:last-child {
  margin-bottom: 0;
}

.page-about .ab-sec__head {
  position: relative;
  display: grid;
  grid-template-columns: 3em minmax(0, 1fr);
  gap: 0.7em;
  align-items: baseline;
  border-top: 1px solid var(--line);
  padding-top: 18px;
  margin: 0 0 22px;
}

.page-about .ab-sec__head::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 56px;
  height: 2px;
  background: var(--c-cyan);
}

.page-about .ab-sec__num {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .ab-sec__head h2 {
  margin: 0;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  font-weight: 900;
  color: var(--c-white);
}

.page-about .ab-sec .prose {
  max-width: 68ch;
}

.page-about .ab-sec .prose p {
  color: var(--c-silver);
  line-height: 1.85;
}

.page-about .ab-sec .prose p + p {
  margin-top: 1.1em;
}

.page-about .ab-note {
  margin-top: 22px;
  padding-left: 16px;
  border-left: 2px solid var(--line-strong);
}

/* ---------- 01 编号说明表 ---------- */
.page-about .ab-defs {
  list-style: none;
  margin: 1.6em 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-defs li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.35em;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-defs__key {
  font-size: 13.5px;
  letter-spacing: 0.05em;
  color: var(--c-cyan);
}

.page-about .ab-defs__val {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-silver);
}

/* ---------- 02 团队分工 ---------- */
.page-about .ab-team__cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-role {
  position: relative;
  background: var(--c-panel);
  border: 2px solid var(--c-ink);
  box-shadow: var(--shadow-hard);
  padding: 18px 18px 22px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.page-about .ab-role::before {
  content: "";
  display: block;
  width: 42px;
  height: 3px;
  margin-bottom: 14px;
  background: var(--c-cyan);
}

.page-about .ab-role:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hard-lg);
}

.page-about .ab-role__num {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-silver);
}

.page-about .ab-role h3 {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.3;
  font-weight: 900;
  color: var(--c-white);
}

.page-about .ab-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-silver);
}

.page-about .ab-team__fig {
  margin: clamp(22px, 3vw, 34px) 0 0;
}

/* ---------- 03 三段式流程 ---------- */
.page-about .ab-flow__fig {
  margin: 0 0 clamp(20px, 3vw, 30px);
}

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

.page-about .ab-flow__step {
  position: relative;
  background: var(--c-panel);
  border: 2px solid var(--c-ink);
  box-shadow: var(--shadow-hard);
  padding: 22px 20px 22px;
}

.page-about .ab-flow__step::before {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  width: 46px;
  height: 16px;
  background: var(--c-orange);
  clip-path: polygon(0 0, 100% 0, 0 100%);
}

.page-about .ab-flow__tag {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-orange);
}

.page-about .ab-flow__step p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-silver);
}

/* ---------- 04 复核轮次 ---------- */
.page-about .ab-cycle {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-left: 2px solid var(--c-cyan);
}

.page-about .ab-cycle__item {
  position: relative;
  padding: 14px 0 14px 24px;
}

.page-about .ab-cycle__item + .ab-cycle__item {
  border-top: 1px solid var(--line);
}

.page-about .ab-cycle__dot {
  position: absolute;
  left: -7px;
  top: 21px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--c-cyan);
  background: var(--c-base);
  border-radius: 50%;
}

.page-about .ab-cycle__name {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
  margin-bottom: 6px;
}

.page-about .ab-cycle__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-silver);
}

/* ---------- 05 客户端与收藏 ---------- */
.page-about .ab-devices {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .ab-devices li {
  background: var(--c-panel-hi);
  border: 2px solid var(--c-ink);
  box-shadow: 4px 4px 0 rgba(5, 7, 15, 0.85);
  padding: 14px 10px;
  text-align: center;
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--c-white);
}

.page-about .ab-collect {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  background: var(--c-panel);
  border: 1px solid var(--line-strong);
  padding: 22px 20px 24px;
}

.page-about .ab-collect__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  align-content: start;
}

.page-about .ab-stat {
  border-left: 3px solid var(--c-cyan);
  padding: 4px 0 4px 16px;
}

.page-about .ab-stat__num {
  display: block;
  font-size: clamp(32px, 4.6vw, 44px);
  font-weight: 900;
  line-height: 1;
  color: var(--c-white);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-silver);
}

.page-about .ab-collect__body p {
  margin: 0;
  color: var(--c-silver);
  line-height: 1.85;
  font-size: 15.5px;
}

.page-about .ab-collect__body p + p {
  margin-top: 1em;
}

/* ---------- 06 行业场景 ---------- */
.page-about .ab-landscape {
  margin: 0 0 clamp(20px, 3vw, 28px);
}

.page-about .ab-industries {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-industries li {
  background: rgba(28, 38, 96, 0.6);
  border: 1px solid var(--line-strong);
  padding: 8px 14px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--c-white);
}

/* ---------- 07 联系 ---------- */
.page-about .ab-prep {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-prep li {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr);
  gap: 0.7em;
  align-items: baseline;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .ab-prep li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-prep .mono {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--c-orange);
}

.page-about .ab-prep span:last-child {
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-silver);
}

.page-about .ab-cta {
  margin-top: clamp(24px, 3.4vw, 34px);
  background:
    linear-gradient(135deg, rgba(255, 138, 61, 0.16) 0%, rgba(255, 138, 61, 0) 58%),
    var(--c-panel-hi);
  border: 2px solid var(--c-ink);
  box-shadow: var(--shadow-hard);
  padding: 24px 22px 26px;
}

.page-about .ab-cta__text {
  margin: 0 0 20px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-white);
}

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

/* ---------- 平板 ---------- */
@media (min-width: 620px) {
  .page-about .ab-devices {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-defs li {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(270px, 0.85fr);
    align-items: start;
  }

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

  .page-about .ab-role:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .ab-role:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .ab-cycle {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    border-left: 0;
    border-top: 2px solid var(--c-cyan);
  }

  .page-about .ab-cycle__item {
    padding: 20px 18px 18px 18px;
  }

  .page-about .ab-cycle__item + .ab-cycle__item {
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-cycle__item:nth-child(3),
  .page-about .ab-cycle__item:nth-child(4) {
    border-top: 1px solid var(--line);
  }

  .page-about .ab-cycle__dot {
    left: -6px;
    top: -8px;
  }

  .page-about .ab-cycle__item:nth-child(2n) .ab-cycle__dot {
    left: -1px;
  }

  .page-about .ab-collect {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
    gap: 30px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-toc-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 62px);
  }

  .page-about .ab-toc {
    position: sticky;
    top: 92px;
    align-self: start;
    border: 0;
    background: transparent;
    padding: 0;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }

  .page-about .ab-hero__actions {
    margin-top: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-role,
  .page-about .ab-toc__list a {
    transition: none;
  }

  .page-about .ab-role:hover {
    transform: none;
  }
}
</PAGE_CSS>>>