.page-about {
  --ab-line: var(--rule);
  --ab-quiet: var(--mist);
  --ab-soft: #3A4A56;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--ff-sans);
}

.page-about p {
  margin: 0 0 16px;
  line-height: 1.75;
}

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

.page-about a {
  color: inherit;
}

.page-about .ab-inner {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.page-about .ab-band--muted {
  background: var(--paper-2);
}

.page-about .ab-band--ink {
  background: var(--ink);
  color: var(--paper);
  --ab-line: rgba(243, 241, 234, 0.22);
  --ab-quiet: #9FADB6;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--mist);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--rule);
}

.page-about .breadcrumb-link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-about .breadcrumb-current {
  color: var(--mist);
}

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero {
  padding: 88px 0 48px;
}

.page-about .ab-frame {
  position: relative;
  border: 1px solid var(--rule);
  padding: 26px 20px 30px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.62), rgba(255, 255, 255, 0) 46%);
}

.page-about .ab-frame::before,
.page-about .ab-frame::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 0 solid var(--signal);
}

.page-about .ab-frame::before {
  top: -1px;
  left: -1px;
  border-top-width: 2px;
  border-left-width: 2px;
}

.page-about .ab-frame::after {
  bottom: -1px;
  right: -1px;
  border-bottom-width: 2px;
  border-right-width: 2px;
}

.page-about .ab-hero-grid {
  display: grid;
  gap: 28px;
}

.page-about .ab-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .ab-kicker::before {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  background: var(--signal);
}

.page-about .ab-h1 {
  margin: 0 0 20px;
  font-family: var(--ff-display);
  font-size: clamp(34px, 6.6vw, 58px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.page-about .ab-lead {
  max-width: 54ch;
  margin: 0;
  font-size: clamp(15.5px, 1.55vw, 18px);
  line-height: 1.8;
}

.page-about .ab-hero-meta {
  list-style: none;
  margin: 28px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--rule);
  display: grid;
  gap: 14px;
}

.page-about .ab-hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .ab-meta-k {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .ab-meta-v {
  font-size: 13px;
  line-height: 1.6;
}

.page-about .figure {
  margin: 0;
}

.page-about .figure-frame {
  overflow: hidden;
  border: 1px solid var(--ab-line);
  background: var(--paper-2);
}

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

.page-about .figure-caption {
  margin-top: 10px;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--ab-quiet);
}

.page-about .ab-hero-fig .figure-frame img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-sec {
  padding: 56px 0;
}

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

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

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

.page-about .ab-h2 {
  margin: 0 0 18px;
  font-family: var(--ff-display);
  font-size: clamp(25px, 3.4vw, 38px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.page-about .ab-h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .ab-p {
  max-width: 66ch;
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ab-soft);
}

.page-about .ab-band--ink .ab-p {
  color: rgba(243, 241, 234, 0.82);
}

/* ---------- 01 数字锚点 ---------- */
.page-about .ab-stats {
  display: grid;
  gap: 18px;
  margin-top: 32px;
}

.page-about .ab-stat {
  position: relative;
  padding-top: 18px;
  border-top: 1px solid var(--ab-line);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-stat::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 36px;
  height: 3px;
  background: var(--signal);
}

.page-about .ab-stat-num {
  font-family: var(--ff-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 5.4vw, 52px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .ab-stat-label {
  font-size: 14px;
  font-weight: 700;
}

.page-about .ab-stat-note {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ab-quiet);
}

/* ---------- 02 时间色带 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-stage {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--ink);
  padding: 22px 20px 28px;
  transition: border-color 0.16s var(--ease), box-shadow 0.16s var(--ease);
}

.page-about .ab-stage::after {
  content: "+";
  position: absolute;
  top: 8px;
  right: 14px;
  font-family: var(--ff-mono);
  font-size: 14px;
  color: var(--mist);
  transition: color 0.16s var(--ease);
}

.page-about .ab-stage:nth-child(2) {
  padding-bottom: 34px;
}

.page-about .ab-stage:nth-child(3) {
  border-left-color: var(--signal);
  padding-bottom: 42px;
}

.page-about .ab-stage:hover,
.page-about .ab-stage:focus {
  border-color: var(--signal-soft);
  border-left-color: var(--signal);
  outline: none;
}

.page-about .ab-stage:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-about .ab-stage:hover::after,
.page-about .ab-stage:focus::after {
  color: var(--signal);
}

.page-about .ab-stage-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .ab-stage-idx {
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--signal);
}

.page-about .ab-stage-name {
  margin: 0;
  font-family: var(--ff-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.page-about .ab-stage-list,
.page-about .ab-team-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-stage-list li,
.page-about .ab-team-list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ab-soft);
}

.page-about .ab-stage-list li::before,
.page-about .ab-team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  background: var(--rule);
}

.page-about .ab-stage-tip {
  position: absolute;
  right: 14px;
  bottom: 12px;
  max-width: 240px;
  padding: 7px 10px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--ff-mono);
  font-size: 11px;
  line-height: 1.45;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s var(--ease);
  pointer-events: none;
}

.page-about .ab-stage:hover .ab-stage-tip,
.page-about .ab-stage:focus .ab-stage-tip,
.page-about .ab-stage:focus-within .ab-stage-tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 03 核验流程 ---------- */
.page-about .ab-split {
  display: grid;
  gap: 24px;
}

.page-about .ab-verify-fig .figure-frame img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .ab-flow {
  display: grid;
  gap: 12px;
  margin: 30px 0 4px;
}

.page-about .ab-flow-node {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  border: 1px solid var(--ab-line);
  background: var(--ink);
  text-decoration: none;
  color: var(--paper);
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.page-about .ab-flow-node:hover,
.page-about .ab-flow-node:focus-visible {
  border-color: var(--signal);
  background: #1B2C3C;
  outline: none;
}

.page-about .ab-flow-node:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-about .ab-flow-idx {
  flex: none;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 999px;
  background: var(--signal);
  color: var(--ink);
  font-family: var(--ff-mono);
  font-size: 11px;
  font-weight: 700;
}

.page-about .ab-flow-name {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .ab-checks {
  display: grid;
  gap: 22px;
  margin-top: 30px;
}

.page-about .ab-check {
  padding-top: 16px;
  border-top: 1px solid var(--ab-line);
  scroll-margin-top: 96px;
}

.page-about .ab-check-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .ab-strip {
  display: grid;
  gap: 18px;
  margin-top: 34px;
  padding: 20px;
  border: 1px solid var(--ab-line);
}

.page-about .ab-strip-num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--ff-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.2vw, 32px);
  font-weight: 600;
  line-height: 1;
}

.page-about .ab-strip-label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ab-quiet);
}

/* ---------- 04 团队档案卡 ---------- */
.page-about .ab-team-scroll {
  display: flex;
  gap: 16px;
  margin-top: 28px;
  padding: 4px 0 20px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-team-scroll:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 4px;
}

.page-about .ab-team-card {
  flex: 0 0 82%;
  max-width: 340px;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  padding-bottom: 22px;
}

.page-about .ab-team-tab {
  display: block;
  padding: 8px 16px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--ff-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
}

.page-about .ab-team-card:first-child .ab-team-tab {
  background: var(--signal);
  color: var(--ink);
  font-weight: 700;
}

.page-about .ab-team-body {
  padding: 18px 16px 0;
}

.page-about .ab-team-num {
  display: block;
  font-family: var(--ff-mono);
  font-variant-numeric: tabular-nums;
  font-size: 44px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .ab-team-unit {
  margin-left: 4px;
  font-family: var(--ff-sans);
  font-size: 12px;
  font-weight: 400;
  color: var(--mist);
}

.page-about .ab-team-name {
  margin: 10px 0 0;
  font-size: 15.5px;
  font-weight: 700;
}

/* ---------- 05 覆盖范围 ---------- */
.page-about .ab-cover {
  position: relative;
  overflow: hidden;
  padding: 64px 0;
}

.page-about .ab-cover-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.6);
}

.page-about .ab-cover-veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(14, 26, 36, 0.97) 0%, rgba(23, 41, 58, 0.86) 58%, rgba(14, 26, 36, 0.62) 100%);
}

.page-about .ab-cover-inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-scale {
  height: 30px;
  margin: 2px 0 26px;
  border-bottom: 1px solid var(--ab-line);
  background-image: repeating-linear-gradient(90deg, rgba(243, 241, 234, 0.4) 0 1px, transparent 1px 3.2%);
}

.page-about .ab-rows {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .ab-row-code {
  padding-top: 3px;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-about .ab-row .ab-h3 {
  margin: 0 0 6px;
  font-size: 15.5px;
}

.page-about .ab-row p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ab-quiet);
}

/* ---------- 06 入口 ---------- */
.page-about .ab-exits {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-about .ab-exit {
  display: block;
  padding: 22px 18px 20px;
  border: 1px solid var(--rule);
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.16s var(--ease), background-color 0.16s var(--ease);
}

.page-about .ab-exit:hover,
.page-about .ab-exit:focus-visible {
  border-color: var(--signal);
  background: rgba(255, 90, 31, 0.05);
  outline: none;
}

.page-about .ab-exit:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

.page-about .ab-exit-k {
  display: block;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .ab-exit .ab-h3 {
  margin: 10px 0 8px;
  font-family: var(--ff-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-exit p {
  margin: 0 0 18px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ab-soft);
}

.page-about .ab-exit-go {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding-bottom: 2px;
  border-bottom: 1px solid var(--signal);
}

.page-about .ab-note {
  margin-top: 26px;
  padding-left: 14px;
  border-left: 2px solid var(--rule);
  font-size: 13px;
  line-height: 1.8;
  color: var(--ab-soft);
}

.page-about .ab-note a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--signal);
}

.page-about .ab-note a:hover,
.page-about .ab-note a:focus-visible {
  color: var(--signal);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .ab-hero-meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .ab-team-card {
    flex: 0 0 46%;
  }
}

@media (min-width: 760px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    background-image: linear-gradient(var(--ab-line), var(--ab-line));
    background-repeat: no-repeat;
    background-size: 100% 1px;
    background-position: 0 50%;
  }

  .page-about .ab-checks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }

  .page-about .ab-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .ab-exits {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ab-team-card {
    flex: 0 0 300px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 132px 0 72px;
  }

  .page-about .ab-frame {
    padding: 36px 36px 40px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-hero-fig {
    margin-top: 12px;
  }

  .page-about .ab-sec {
    padding: 88px 0;
  }

  .page-about .ab-grid {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    column-gap: var(--sp-3);
  }

  .page-about .ab-rail {
    display: block;
    position: relative;
    padding-top: 6px;
  }

  .page-about .ab-rail::before {
    content: "";
    position: absolute;
    left: 0;
    top: 28px;
    bottom: 0;
    width: 1px;
    background: var(--ab-line);
  }

  .page-about .ab-rail-num {
    display: block;
    font-family: var(--ff-mono);
    font-size: 13px;
    letter-spacing: 0.16em;
    color: var(--ab-quiet);
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-verify-fig {
    margin-top: 44px;
  }

  .page-about .ab-cover {
    padding: 96px 0;
  }

  .page-about .ab-row {
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 20px;
    padding: 20px 0;
  }
}
<<<END>>>