.page-about {
  --ab-rule: 1px solid var(--line);
  --ab-soft: rgba(16, 42, 68, .5);
  --ab-gutter: clamp(18px, 5vw, 52px);
  display: block;
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-about .ab-wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--ab-gutter);
}

/* ---------- 面包屑 ---------- */
.page-about .crumb {
  padding: 22px 0 10px;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--stone);
}

.page-about .crumb-sep {
  margin: 0 8px;
  color: rgba(155, 169, 184, .5);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 12px 0 clamp(34px, 5vw, 56px);
  border-bottom: var(--ab-rule);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: -40px -30% auto auto;
  width: min(560px, 80vw);
  height: 320px;
  background:
    radial-gradient(60% 60% at 70% 20%, rgba(139, 92, 255, .22), transparent 70%),
    radial-gradient(50% 50% at 30% 70%, rgba(63, 224, 208, .16), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .ab-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-kicker {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-size: clamp(30px, 6.2vw, 54px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 18em;
}

.page-about .ab-lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(244, 247, 251, .82);
}

.page-about .ab-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border: var(--ab-rule);
  border-left: 2px solid var(--cyan);
  border-radius: var(--r-s);
  background: var(--ab-soft);
}

.page-about .ab-fact-num {
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -.01em;
}

.page-about .ab-fact-label {
  font-size: 13px;
  color: var(--stone);
}

/* ---------- 章节壳 ---------- */
.page-about .ab-section {
  padding: clamp(46px, 7vw, 82px) 0 0;
}

.page-about .ab-sec-head {
  max-width: 70ch;
  margin-bottom: clamp(24px, 3.6vw, 38px);
}

.page-about .section-num {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--violet);
}

.page-about .ab-sec-title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .ab-sec-lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(244, 247, 251, .74);
}

/* ---------- 三条服务线 ---------- */
.page-about .ab-pillars {
  display: grid;
  gap: 16px;
}

.page-about .ab-pillar {
  padding: 22px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .ab-pillar--solid {
  background: var(--ink-700);
  border: var(--ab-rule);
}

.page-about .ab-pillar .panel-num {
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.page-about .ab-pillar .panel-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-pillar .panel-body {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(244, 247, 251, .76);
}

.page-about .ab-link {
  margin-top: auto;
  align-self: flex-start;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 208, .4);
  padding-bottom: 2px;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--orange);
  border-color: rgba(255, 138, 61, .6);
}

/* ---------- 版本时间轴 ---------- */
.page-about .ab-figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .ab-figure .figure-media {
  border-radius: var(--r-m);
  overflow: hidden;
  border: var(--ab-rule);
  background: var(--ink-800);
}

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

.page-about .ab-figure .figure-note,
.page-about .ab-team-figure .figure-note,
.page-about .ab-return-figure .figure-note {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 4px 30px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 58%, rgba(155, 169, 184, .18));
}

.page-about .ab-node {
  position: relative;
  padding-bottom: 26px;
}

.page-about .ab-node:last-child {
  padding-bottom: 0;
}

.page-about .ab-node-dot {
  position: absolute;
  left: -30px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 224, 208, .1);
}

.page-about .ab-node--origin .ab-node-dot {
  border-color: var(--violet);
  box-shadow: 0 0 0 4px rgba(139, 92, 255, .12);
}

.page-about .ab-node--now .ab-node-dot {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(63, 224, 208, .18);
}

.page-about .ab-node-card {
  padding: 18px 18px 20px;
  border: var(--ab-rule);
  border-radius: var(--r-m);
  background: var(--ab-soft);
  backdrop-filter: blur(6px);
}

.page-about .ab-node--now .ab-node-card {
  background: linear-gradient(150deg, rgba(63, 224, 208, .1), rgba(16, 42, 68, .72) 46%);
  border-color: rgba(63, 224, 208, .34);
}

.page-about .ab-node--origin .ab-node-card {
  background: linear-gradient(150deg, rgba(139, 92, 255, .1), rgba(11, 29, 51, .7) 52%);
  border-color: rgba(139, 92, 255, .3);
}

.page-about .ab-node-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .ab-node-ver {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .ab-node--origin .ab-node-ver {
  color: var(--violet);
}

.page-about .ab-node-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-node-sum {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 247, 251, .76);
}

/* ---------- 折叠面板 ---------- */
.page-about .ab-fold {
  margin-top: 14px;
  border-top: 1px dashed var(--line-soft);
  padding-top: 12px;
}

.page-about .ab-fold-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 6px 0;
  background: none;
  border: 0;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--stone);
  text-align: left;
  transition: color .24s var(--ease);
}

.page-about .ab-fold-toggle:hover,
.page-about .ab-fold-toggle:focus-visible {
  color: var(--cyan);
}

.page-about .ab-fold-caret {
  flex: none;
  width: 9px;
  height: 9px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform .28s var(--ease);
}

.page-about .ab-fold-toggle[aria-expanded="true"] .ab-fold-caret {
  transform: rotate(225deg);
}

.page-about .ab-fold-body {
  padding-top: 8px;
}

.page-about .ab-detail {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 247, 251, .74);
}

.page-about .ab-detail li::marker {
  color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .ab-team-grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 34px);
}

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

.page-about .ab-team-figure .figure-media {
  border-radius: var(--r-m);
  overflow: hidden;
  border: var(--ab-rule);
  background: var(--ink-800);
}

.page-about .ab-roles {
  margin: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-role {
  padding: 15px 16px;
  border-left: 2px solid rgba(63, 224, 208, .28);
  background: linear-gradient(90deg, rgba(16, 42, 68, .62), rgba(16, 42, 68, .18));
  border-radius: 0 var(--r-s) var(--r-s) 0;
  transition: border-color .26s var(--ease), background .26s var(--ease);
}

.page-about .ab-role:nth-child(2) {
  border-left-color: rgba(139, 92, 255, .44);
}

.page-about .ab-role:nth-child(3) {
  border-left-color: rgba(201, 120, 90, .5);
}

.page-about .ab-role:nth-child(4) {
  border-left-color: rgba(111, 168, 140, .55);
}

.page-about .ab-role:hover {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(63, 224, 208, .12), rgba(16, 42, 68, .2));
}

.page-about .ab-role-name {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-role-index {
  font-size: 12px;
  color: var(--stone);
  letter-spacing: .08em;
}

.page-about .ab-role-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: rgba(244, 247, 251, .74);
}

.page-about .ab-stat-strip {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 22px;
}

.page-about .ab-stat {
  padding: 16px 16px 18px;
  border: var(--ab-rule);
  border-radius: var(--r-m);
  background: var(--ink-700);
}

.page-about .ab-stat .stat-value {
  display: block;
  font-size: clamp(24px, 3.2vw, 30px);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .ab-stat:nth-child(2) .stat-value {
  color: var(--violet);
}

.page-about .ab-stat:nth-child(3) .stat-value {
  color: var(--orange);
}

.page-about .ab-stat .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone);
}

.page-about .ab-team-note {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(244, 247, 251, .7);
}

/* ---------- 回访支持 ---------- */
.page-about .ab-return-figure {
  margin: 0 0 clamp(24px, 3.4vw, 34px);
}

.page-about .ab-return-figure .figure-media {
  border-radius: var(--r-m);
  overflow: hidden;
  border: var(--ab-rule);
  background: linear-gradient(120deg, rgba(139, 92, 255, .14), rgba(16, 42, 68, .8));
}

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

.page-about .ab-step {
  position: relative;
  padding: 20px 18px 22px;
  border: var(--ab-rule);
  border-radius: var(--r-m);
  background: var(--ab-soft);
}

.page-about .ab-step::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent 82%);
  opacity: .55;
}

.page-about .ab-step-num {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .ab-step-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-step-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 247, 251, .76);
}

/* ---------- CTA ---------- */
.page-about .ab-cta {
  margin-top: clamp(30px, 4.4vw, 48px);
  padding: clamp(22px, 3.4vw, 34px);
  border: 1px solid rgba(255, 138, 61, .32);
  border-radius: var(--r-l);
  background:
    radial-gradient(70% 120% at 100% 0%, rgba(255, 138, 61, .16), transparent 62%),
    linear-gradient(160deg, rgba(16, 42, 68, .86), rgba(11, 29, 51, .9));
  display: grid;
  gap: 20px;
}

.page-about .ab-cta-title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(18px, 2.6vw, 23px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-cta-sub {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 247, 251, .74);
}

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

.page-about .ab-cta-actions .btn {
  flex: 1 1 auto;
  justify-content: center;
  text-align: center;
}

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

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

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

  .page-about .ab-cta {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .page-about .ab-cta-actions .btn {
    flex: 0 0 auto;
  }
}

@media (min-width: 860px) {
  .page-about .ab-pillars {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 20px;
    align-items: start;
  }

  .page-about .ab-pillar:nth-child(1) {
    grid-column: 1 / span 5;
  }

  .page-about .ab-pillar:nth-child(2) {
    grid-column: 7 / span 6;
    margin-top: 46px;
  }

  .page-about .ab-pillar:nth-child(3) {
    grid-column: 3 / span 5;
    margin-top: -8px;
  }

  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .ab-return-figure .figure-media {
    max-height: 340px;
  }

  .page-about .ab-return-figure img {
    height: 340px;
  }
}

@media (min-width: 1040px) {
  .page-about .ab-timeline {
    padding-left: 40px;
  }

  .page-about .ab-timeline::before {
    left: 9px;
  }

  .page-about .ab-node-dot {
    left: -40px;
    width: 18px;
    height: 18px;
  }

  .page-about .ab-node-card {
    padding: 22px 24px 24px;
  }

  .page-about .ab-section--timeline .ab-node-card {
    max-width: 78ch;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero {
    padding-top: 22px;
  }
}
<<<END>>>