.page-about {
  --ab-line: rgba(11, 27, 51, .13);
  --ab-line-soft: rgba(11, 27, 51, .07);
  --ab-line-light: rgba(169, 242, 220, .2);
  --ab-shadow: 0 22px 52px -32px rgba(11, 27, 51, .55);
  background: var(--c-cream);
  color: var(--c-ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ---------- Hero ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(34px, 6vw, 70px) 0 clamp(38px, 6vw, 76px);
  background:
    radial-gradient(120% 150% at 8% -12%, rgba(47, 224, 176, .32), transparent 56%),
    radial-gradient(95% 130% at 96% -6%, rgba(242, 180, 65, .18), transparent 60%),
    linear-gradient(158deg, var(--c-space) 0%, var(--c-night) 100%);
  color: var(--c-cream);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  bottom: -55%;
  width: 62%;
  height: 130%;
  border-left: 1px solid var(--ab-line-light);
  transform: rotate(14deg);
  pointer-events: none;
}

.page-about .ab-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-about .ab-hero-copy {
  max-width: 44ch;
}

.page-about .ab-hero .eyebrow {
  color: var(--c-aurora);
}

.page-about .ab-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 6.4vw, 56px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--c-paper);
}

.page-about .ab-lede {
  margin: 20px 0 0;
  max-width: 42ch;
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.85;
  color: rgba(245, 240, 230, .82);
}

.page-about .ab-hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line-light);
  border: 1px solid var(--ab-line-light);
}

.page-about .ab-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px;
  background: rgba(11, 27, 51, .55);
}

.page-about .ab-hero-stats .num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-aurora);
}

.page-about .ab-stat-k {
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(245, 240, 230, .68);
}

/* ---------- Section shell ---------- */
.page-about .ab-section {
  padding: clamp(46px, 7.5vw, 92px) 0;
}

.page-about .ab-head {
  max-width: 62ch;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .ab-head h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--c-space);
}

.page-about .ab-sub {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--c-slate);
}

.page-about .ab-head--light h2 { color: var(--c-paper); }
.page-about .ab-head--light .ab-sub { color: rgba(245, 240, 230, .68); }
.page-about .ab-head--light .eyebrow { color: var(--c-aurora); }

/* ---------- 01 日常运营 ---------- */
.page-about .ab-daily {
  background: var(--c-cream);
}

.page-about .ab-daily-grid {
  display: grid;
  gap: 22px;
  padding-bottom: clamp(24px, 4vw, 40px);
}

.page-about .ab-daily-grid h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--c-space);
}

.page-about .ab-daily-body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-ink);
}

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

.page-about .ab-quote {
  margin-top: clamp(20px, 3.5vw, 32px);
  padding: clamp(24px, 4vw, 40px) clamp(22px, 4vw, 46px);
  background: linear-gradient(150deg, var(--c-space), var(--c-night));
  color: var(--c-cream);
  border-left: 3px solid var(--c-gold);
  box-shadow: var(--ab-shadow);
}

.page-about .ab-quote p {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(17px, 2.6vw, 22px);
  font-weight: 700;
  line-height: 1.62;
  color: var(--c-paper);
}

.page-about .ab-quote-by {
  display: block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-aurora);
}

/* ---------- 02 时间轴 ---------- */
.page-about .ab-timeline {
  background: var(--c-paper);
  border-top: 1px solid var(--ab-line-soft);
  border-bottom: 1px solid var(--ab-line-soft);
}

.page-about .ab-tl-figure {
  margin: 0 0 clamp(30px, 5vw, 52px);
}

.page-about .ab-tl-figure figcaption {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-slate);
}

.page-about .ab-axis {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .ab-axis::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-aurora), rgba(47, 224, 176, .12));
}

.page-about .ab-node {
  position: relative;
  display: grid;
  gap: 10px;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-paper);
  border: 2px solid var(--c-aurora);
  box-shadow: 0 0 0 4px rgba(47, 224, 176, .14);
}

.page-about .ab-node-key {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .ab-node-key .num {
  font-family: var(--font-mono);
  font-size: clamp(19px, 3.2vw, 24px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--c-ember);
}

.page-about .ab-node-tag {
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--c-slate);
}

.page-about .ab-node-body h3 {
  margin: 0 0 8px;
  font-size: clamp(17.5px, 2.7vw, 21px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--c-space);
}

.page-about .ab-node-body p {
  margin: 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-ink);
}

/* ---------- 03 团队 ---------- */
.page-about .ab-band-dark {
  position: relative;
  background:
    radial-gradient(110% 130% at 88% 0%, rgba(47, 224, 176, .16), transparent 58%),
    linear-gradient(165deg, var(--c-space), var(--c-night));
  color: var(--c-cream);
}

.page-about .ab-team-top {
  display: grid;
  gap: 28px;
  align-items: start;
  margin-bottom: clamp(26px, 4.5vw, 46px);
}

.page-about .ab-team-copy .eyebrow { color: var(--c-aurora); }

.page-about .ab-team-copy h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.02em;
  color: var(--c-paper);
}

.page-about .ab-team-copy p {
  margin: 16px 0 0;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(245, 240, 230, .82);
}

.page-about .ab-team-copy .btn {
  margin-top: 22px;
}

.page-about .ab-team-figure .media {
  border: 1px solid var(--ab-line-light);
}

.page-about .ab-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line-light);
  border: 1px solid var(--ab-line-light);
}

.page-about .ab-role {
  background: rgba(21, 35, 63, .82);
  padding: 4px 18px 4px;
}

.page-about .ab-role summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .ab-role summary::-webkit-details-marker { display: none; }

.page-about .ab-role summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--c-gold);
}

.page-about .ab-role[open] summary::after { content: "–"; }

.page-about .ab-role summary .num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-aurora);
}

.page-about .ab-role-name {
  letter-spacing: .01em;
}

.page-about .ab-role p {
  margin: 0 0 18px;
  padding-left: 44px;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(245, 240, 230, .72);
}

/* ---------- 04 合作门槛 ---------- */
.page-about .ab-partners {
  background: var(--c-cream);
}

.page-about .ab-gates {
  display: grid;
  gap: 20px;
}

.page-about .ab-gate {
  padding: clamp(24px, 4vw, 38px);
  background: var(--c-paper);
  border: 1px solid var(--ab-line);
  box-shadow: var(--ab-shadow);
}

.page-about .ab-gate--dark {
  background: linear-gradient(150deg, var(--c-night), var(--c-space));
  border-color: rgba(47, 224, 176, .3);
  color: var(--c-cream);
}

.page-about .ab-gate-no {
  display: block;
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-ember);
}

.page-about .ab-gate--dark .ab-gate-no { color: var(--c-gold); }

.page-about .ab-gate h3 {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.9vw, 22px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--c-space);
}

.page-about .ab-gate--dark h3 { color: var(--c-paper); }

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

.page-about .ab-gate--dark p { color: rgba(245, 240, 230, .8); }

.page-about .ab-gate p + p { margin-top: 12px; }

.page-about .ab-gate-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 18px 0 0;
  border-top: 1px dashed var(--ab-line);
  display: grid;
  gap: 11px;
}

.page-about .ab-gate-list li {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-ink);
}

.page-about .ab-tick {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 8px;
  background: var(--c-aurora);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 50% 100%, 0 72%);
}

/* ---------- 05 服务网络 ---------- */
.page-about .ab-network {
  background: var(--c-paper);
  border-top: 1px solid var(--ab-line-soft);
}

.page-about .ab-network-grid {
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-about .ab-network-copy p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-ink);
}

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

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

.page-about .ab-network-figure .media {
  border: 1px solid var(--ab-line);
}

.page-about .ab-network-figure figcaption {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-slate);
}

.page-about .ab-cities {
  list-style: none;
  margin: clamp(26px, 4.5vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-city {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  background: var(--c-cream);
  border-left: 3px solid var(--c-aurora);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-city:hover {
  background: #efe8da;
  transform: translateX(5px);
}

.page-about .ab-city .num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-space);
}

.page-about .ab-city-k {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c-ember);
}

.page-about .ab-city-v {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-slate);
}

/* ---------- 06 服务标准 ---------- */
.page-about .ab-standards {
  background:
    radial-gradient(110% 120% at 10% 4%, rgba(47, 224, 176, .18), transparent 56%),
    linear-gradient(170deg, var(--c-space), var(--c-night));
}

.page-about .ab-std-grid {
  display: grid;
  gap: 18px;
}

.page-about .ab-std {
  padding: clamp(20px, 3.4vw, 30px);
  background: rgba(21, 35, 63, .78);
  border: 1px solid var(--ab-line-light);
}

.page-about .ab-std h3 {
  margin: 0 0 10px;
  font-size: 17.5px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--c-paper);
}

.page-about .ab-std p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(245, 240, 230, .74);
}

.page-about .ab-cta {
  margin-top: clamp(26px, 4.5vw, 44px);
  padding: clamp(22px, 3.6vw, 34px);
  border: 1px solid var(--ab-line-light);
  border-left: 3px solid var(--c-gold);
  display: grid;
  gap: 18px;
}

.page-about .ab-cta p {
  margin: 0;
  font-size: clamp(16px, 2.4vw, 19px);
  font-weight: 700;
  line-height: 1.6;
  color: var(--c-paper);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 52px;
    align-items: end;
  }

  .page-about .ab-daily-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-daily-head h2 {
    margin-top: 14px;
  }

  .page-about .ab-axis {
    padding-left: 0;
    gap: clamp(30px, 4.5vw, 54px);
  }

  .page-about .ab-axis::before {
    left: 158px;
  }

  .page-about .ab-node {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 34px;
  }

  .page-about .ab-node::before {
    left: 153px;
    top: 9px;
  }

  .page-about .ab-node-key {
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    text-align: right;
  }

  .page-about .ab-team-top {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
  }

  .page-about .ab-network-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    gap: 48px;
  }

  .page-about .ab-std-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 30px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-quote {
    margin-left: auto;
    max-width: 74%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-city {
    transition: none;
  }
  .page-about .ab-city:hover {
    transform: none;
  }
}