.page-about {
  --ab-hair: 1px solid rgba(47, 212, 198, 0.18);
  --ab-hair-soft: 1px solid rgba(47, 212, 198, 0.12);
  --ab-glass: rgba(18, 46, 68, 0.52);
  --ab-panel-soft: rgba(14, 36, 56, 0.6);
  color: var(--qx-ink);
  background: var(--qx-deep);
  overflow-x: hidden;
}

/* ---------- 封面首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(28px, 6vw, 68px) 0 clamp(30px, 5vw, 58px);
  border-bottom: var(--ab-hair);
  isolation: isolate;
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -46%;
  right: -12%;
  width: min(760px, 88vw);
  height: min(760px, 88vw);
  background: radial-gradient(circle at 50% 50%, rgba(47, 212, 198, 0.16), transparent 62%);
  pointer-events: none;
  z-index: -1;
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(to bottom, rgba(138, 230, 221, 0.05) 0 1px, transparent 1px 7px);
  opacity: 0.55;
  pointer-events: none;
  z-index: -1;
}
.page-about .ab-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}
.page-about .ab-hero__eyebrow {
  color: var(--qx-cyan-soft);
  letter-spacing: 0.16em;
  font-size: 12px;
  text-transform: uppercase;
}
.page-about .ab-hero__title {
  margin: 0;
  max-width: 17ch;
  font-size: clamp(28px, 5.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--qx-ink);
}
.page-about .ab-hero__lede {
  max-width: 60ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--qx-muted);
}
.page-about .ab-hero__metrics {
  list-style: none;
  margin: clamp(10px, 2vw, 18px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(47, 212, 198, 0.18);
  border: 1px solid rgba(47, 212, 198, 0.18);
  border-radius: var(--qx-r-md);
  overflow: hidden;
}
.page-about .ab-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--qx-deep);
}
.page-about .ab-metric__num {
  font-family: var(--qx-mono);
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--qx-amber);
}
.page-about .ab-metric__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--qx-muted);
}
.page-about .ab-hero__annot {
  display: none;
  margin: 0;
  font-family: var(--qx-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  color: rgba(138, 230, 221, 0.55);
}

/* ---------- 框架：左侧章节轴 + 右侧内容 ---------- */
.page-about .ab-shell {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
  padding-block: clamp(22px, 4vw, 44px) clamp(40px, 6vw, 76px);
}
.page-about .ab-rail__title {
  margin: 0 0 8px;
  font-family: var(--qx-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: rgba(138, 230, 221, 0.6);
  text-transform: uppercase;
}
.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .ab-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid rgba(47, 212, 198, 0.18);
  background: transparent;
  color: var(--qx-muted);
  font-size: 13.5px;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.page-about .ab-rail__num {
  font-family: var(--qx-mono);
  font-size: 11px;
  color: rgba(242, 180, 65, 0.75);
}
.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--qx-ink);
  border-color: rgba(47, 212, 198, 0.5);
  background: var(--ab-glass);
  outline: none;
}
.page-about .ab-rail__link[aria-current="true"] {
  color: var(--qx-deep);
  background: var(--qx-cyan);
  border-color: var(--qx-cyan);
  font-weight: 600;
}
.page-about .ab-rail__link[aria-current="true"] .ab-rail__num {
  color: rgba(8, 24, 38, 0.65);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  padding-block: clamp(24px, 4vw, 40px);
  border-top: var(--ab-hair);
}
.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .ab-sec__num {
  margin: 0 0 6px;
  font-family: var(--qx-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--qx-amber);
}
.page-about .ab-h2 {
  margin: 0 0 10px;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.28;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--qx-ink);
  max-width: 26ch;
}
.page-about .ab-sec__lede {
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--qx-muted);
}

/* ---------- 能力卡 ---------- */
.page-about .ab-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .ab-cap {
  position: relative;
  padding: 16px 16px 18px;
  border: 1px solid rgba(47, 212, 198, 0.2);
  border-radius: var(--qx-r-md);
  background: var(--ab-glass);
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.page-about .ab-cap::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 2px;
  border-radius: 2px;
  background: var(--qx-cyan);
  opacity: 0.5;
}
.page-about .ab-cap:hover,
.page-about .ab-cap:focus-within {
  transform: translateY(-4px);
  border-color: rgba(47, 212, 198, 0.55);
}
.page-about .ab-cap__idx {
  margin: 0 0 6px;
  padding-left: 10px;
  font-family: var(--qx-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--qx-cyan-soft);
}
.page-about .ab-cap__title {
  margin: 0 0 8px;
  padding-left: 10px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--qx-ink);
}
.page-about .ab-cap__text {
  margin: 0 0 10px;
  padding-left: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--qx-muted);
}
.page-about .ab-cap__scene {
  margin: 0;
  padding: 8px 10px;
  border-radius: var(--qx-r-sm);
  background: rgba(8, 24, 38, 0.55);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(154, 176, 189, 0.72);
  transition: color 0.25s ease, background 0.25s ease;
}
.page-about .ab-cap:hover .ab-cap__scene {
  color: var(--qx-cyan-soft);
  background: rgba(8, 24, 38, 0.85);
}

/* ---------- 提示条 ---------- */
.page-about .ab-note {
  margin: 16px 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--qx-cyan);
  border-radius: 0 var(--qx-r-sm) var(--qx-r-sm) 0;
  background: rgba(18, 46, 68, 0.45);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--qx-muted);
}
.page-about .ab-note strong {
  color: var(--qx-ink);
  font-weight: 600;
}
.page-about .ab-note a {
  color: var(--qx-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .ab-note a:hover {
  color: var(--qx-cyan-soft);
}

/* ---------- 图片容器 ---------- */
.page-about .ab-fig {
  margin: 0;
  border-radius: var(--qx-r-md);
  overflow: hidden;
  border: 1px solid rgba(47, 212, 198, 0.2);
  background: var(--qx-panel);
}
.page-about .ab-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-fig figcaption {
  padding: 9px 13px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--qx-muted);
  border-top: var(--ab-hair-soft);
}

/* ---------- 覆盖与节点 ---------- */
.page-about .ab-cover {
  display: grid;
  gap: 12px;
}
.page-about .ab-cover__side {
  display: grid;
  gap: 12px;
  align-content: start;
}
.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}
.page-about .ab-stat {
  padding: 11px 12px;
  border: 1px dashed rgba(47, 212, 198, 0.3);
  border-radius: var(--qx-r-sm);
  background: rgba(8, 24, 38, 0.4);
}
.page-about .ab-stat__num {
  display: block;
  font-family: var(--qx-mono);
  font-size: clamp(19px, 2.4vw, 27px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--qx-amber);
}
.page-about .ab-stat__label {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  color: var(--qx-muted);
}

.page-about .ab-regions {
  margin-top: 16px;
  display: grid;
  gap: 8px;
}
.page-about .ab-region {
  border: 1px solid rgba(47, 212, 198, 0.18);
  border-radius: var(--qx-r-sm);
  background: var(--ab-panel-soft);
  overflow: hidden;
}
.page-about .ab-region summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--qx-ink);
}
.page-about .ab-region summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-region summary::after {
  content: "＋";
  font-family: var(--qx-mono);
  font-size: 13px;
  color: var(--qx-cyan);
  flex: none;
}
.page-about .ab-region[open] summary::after {
  content: "－";
}
.page-about .ab-region summary:hover {
  background: rgba(47, 212, 198, 0.07);
}
.page-about .ab-region__body {
  padding: 0 14px 14px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--qx-muted);
}

/* ---------- 版本时间线 ---------- */
.page-about .ab-line {
  list-style: none;
  margin: 0;
  padding: 0 0 0 42px;
  position: relative;
}
.page-about .ab-line::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, var(--qx-cyan), rgba(47, 212, 198, 0.12));
}
.page-about .ab-line__item {
  position: relative;
  margin-bottom: 12px;
}
.page-about .ab-line__item:last-child {
  margin-bottom: 0;
}
.page-about .ab-line__item::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 20px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--qx-cyan);
  box-shadow: 0 0 0 4px rgba(47, 212, 198, 0.14);
}
.page-about .ab-line__item:last-child::before {
  background: var(--qx-amber);
  box-shadow: 0 0 0 4px rgba(242, 180, 65, 0.18);
}
.page-about .ab-line__card {
  padding: 14px 15px 16px;
  border-radius: var(--qx-r-md);
  background: var(--qx-cream);
  border: 1px solid var(--qx-paper-line);
  box-shadow: 0 12px 26px rgba(2, 10, 18, 0.3);
}
.page-about .ab-line__ver {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid rgba(14, 122, 114, 0.28);
  background: rgba(14, 122, 114, 0.1);
  font-family: var(--qx-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--qx-teal-dark);
}
.page-about .ab-line__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--qx-ink-dark);
}
.page-about .ab-line__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--qx-ink-mid);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 16px;
}
.page-about .ab-team__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .ab-team__card {
  padding: 13px 14px;
  border-radius: var(--qx-r-sm);
  background: var(--ab-glass);
  border: 1px solid rgba(47, 212, 198, 0.16);
}
.page-about .ab-team__name {
  margin: 0 0 5px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--qx-cyan-soft);
}
.page-about .ab-team__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--qx-muted);
}
.page-about .ab-flow {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .ab-flow__step {
  padding: 10px 12px;
  border-top: 2px solid var(--qx-cyan);
  border-radius: 0 0 var(--qx-r-sm) var(--qx-r-sm);
  background: var(--ab-panel-soft);
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--qx-ink);
}
.page-about .ab-flow__step span {
  display: block;
  margin-bottom: 3px;
  font-family: var(--qx-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--qx-cyan-soft);
}

/* ---------- 行业 ---------- */
.page-about .ab-ind {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .ab-ind__card {
  padding: 14px 15px 16px;
  border-radius: var(--qx-r-md);
  background: linear-gradient(150deg, rgba(18, 46, 68, 0.68), rgba(14, 36, 56, 0.28));
  border: 1px solid rgba(47, 212, 198, 0.16);
  border-bottom-color: rgba(47, 212, 198, 0.32);
}
.page-about .ab-ind__name {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--qx-ink);
}
.page-about .ab-ind__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--qx-muted);
}

/* ---------- 理由 ---------- */
.page-about .ab-why {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}
.page-about .ab-why__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  padding: 14px 15px;
  border-radius: var(--qx-r-md);
  background: linear-gradient(90deg, rgba(18, 46, 68, 0.7), rgba(14, 36, 56, 0.24));
  border: 1px solid rgba(47, 212, 198, 0.16);
}
.page-about .ab-why__num {
  font-family: var(--qx-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--qx-amber);
  padding-top: 3px;
}
.page-about .ab-why__title {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--qx-ink);
}
.page-about .ab-why__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--qx-muted);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  margin-top: 18px;
  padding: 20px 18px;
  border-radius: var(--qx-r-md);
  background: var(--qx-cream);
  color: var(--qx-ink-dark);
  border: 1px solid var(--qx-paper-line);
}
.page-about .ab-cta__title {
  margin: 0 0 6px;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--qx-ink-dark);
}
.page-about .ab-cta__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--qx-ink-mid);
}
.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 14px;
}
.page-about .ab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid rgba(18, 35, 46, 0.35);
  background: transparent;
  color: var(--qx-ink-dark);
  font-size: 13.5px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.page-about .ab-btn:hover,
.page-about .ab-btn:focus-visible {
  transform: translateY(-2px);
  background: rgba(18, 35, 46, 0.08);
  outline: none;
}
.page-about .ab-btn--solid {
  background: var(--qx-ink-dark);
  border-color: var(--qx-ink-dark);
  color: var(--qx-cream);
}
.page-about .ab-btn--solid:hover,
.page-about .ab-btn--solid:focus-visible {
  background: var(--qx-teal-dark);
  border-color: var(--qx-teal-dark);
  color: var(--qx-cream);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-ind {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    column-gap: clamp(20px, 3vw, 42px);
  }
  .page-about .ab-hero__metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-hero__annot {
    display: block;
    grid-column: 2;
    grid-row: 1 / span 3;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    justify-self: end;
    align-self: stretch;
    padding-top: 6px;
  }
  .page-about .ab-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-cover {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }
  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .ab-shell {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
  }
  .page-about .ab-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }
  .page-about .ab-rail__list {
    display: grid;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .ab-rail__link {
    display: flex;
    width: 100%;
    border-radius: var(--qx-r-sm);
    border-color: transparent;
    border-left: 2px solid rgba(47, 212, 198, 0.2);
    padding: 8px 10px;
  }
  .page-about .ab-rail__link[aria-current="true"] {
    border-radius: var(--qx-r-sm);
    border-left-color: var(--qx-cyan);
  }
  .page-about .ab-rail__title {
    padding-left: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-cap,
  .page-about .ab-btn,
  .page-about .ab-rail__link,
  .page-about .ab-cap__scene {
    transition: none;
  }
  .page-about .ab-cap:hover,
  .page-about .ab-btn:hover {
    transform: none;
  }
}
<<<END>>>