.page-about {
  --ab-line: rgba(11, 26, 43, .14);
  --ab-line-light: rgba(246, 241, 231, .22);
  background:
    radial-gradient(120% 62% at 102% -4%, rgba(18, 200, 214, .09), transparent 62%),
    var(--paper-100);
  color: var(--char-800);
  overflow-x: hidden;
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 24px 0 96px;
  background: linear-gradient(148deg, #0B1A2B 0%, #14304A 62%, #0B1A2B 100%);
  color: var(--paper-100);
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -140px;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 38%, rgba(18, 200, 214, .42), rgba(18, 200, 214, 0) 70%);
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -78px;
  height: 160px;
  background: var(--paper-100);
  transform: rotate(-2.6deg);
  transform-origin: left bottom;
}
.page-about .ab-hero .container {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 28px;
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(246, 241, 231, .6);
}
.page-about .ab-hero .breadcrumb a {
  color: var(--cyan-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(111, 227, 236, .3);
  padding-bottom: 2px;
}
.page-about .ab-hero .breadcrumb a:hover {
  color: var(--paper-0);
  border-bottom-color: var(--paper-0);
}
.page-about .ab-hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--gold-500);
  margin: 0 0 14px;
}
.page-about .ab-hero-title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(28px, 7.4vw, 50px);
  line-height: 1.16;
  letter-spacing: -.02em;
  margin: 0 0 18px;
  max-width: 15em;
}
.page-about .ab-hero-lead {
  color: rgba(246, 241, 231, .84);
  font-size: 17px;
  line-height: 1.78;
  max-width: 34em;
  margin: 0 0 26px;
}
.page-about .ab-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 章节骨架 */
.page-about .ab-chapter {
  padding: 52px 0 0;
}
.page-about .ab-chapter--end {
  padding-bottom: 68px;
}
.page-about .ab-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .ab-body {
  min-width: 0;
}
.page-about .ab-num {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--amber-500);
}
.page-about .ab-num span:last-child {
  color: var(--slate-600);
  letter-spacing: .22em;
}
.page-about .ab-num--light {
  color: var(--gold-200);
}
.page-about .ab-num--light span:last-child {
  color: rgba(246, 241, 231, .66);
}
.page-about .ab-h2 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(23px, 5.4vw, 34px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--ink-900);
  margin: 0 0 14px;
}
.page-about .ab-h2--light {
  color: var(--paper-0);
}
.page-about .ab-p {
  font-size: 17px;
  line-height: 1.78;
  color: var(--slate-600);
  max-width: 33em;
  margin: 0 0 18px;
}
.page-about .ab-p--light {
  color: rgba(246, 241, 231, .8);
}
.page-about .ab-body :where(a) {
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}
.page-about .ab-body :where(a:hover) {
  color: var(--cyan-500);
}
.page-about .ab-note {
  font-size: 13px;
  line-height: 1.7;
}

/* 三件事 */
.page-about .ab-do {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-do li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-do-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--amber-500);
  padding-top: 5px;
}
.page-about .ab-do-title {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 18px;
  color: var(--ink-900);
  margin: 0 0 6px;
}
.page-about .ab-do p {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--slate-600);
}

/* 分工 */
.page-about .ab-team {
  display: grid;
  gap: 24px;
  margin-top: 26px;
}
.page-about .ab-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-role {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 18px 18px 16px;
  background: var(--paper-0);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}
.page-about .ab-role-count {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  color: var(--cyan-500);
}
.page-about .ab-role-unit {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--slate-600);
}
.page-about .ab-role:nth-child(2) .ab-role-count {
  color: var(--gold-500);
}
.page-about .ab-role:nth-child(3) .ab-role-count {
  color: var(--slate-600);
}
.page-about .ab-role-text {
  min-width: 0;
}
.page-about .ab-role-name {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 18px;
  color: var(--ink-900);
  margin: 0 0 6px;
}
.page-about .ab-role-desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--slate-600);
}
.page-about .ab-role-link {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  padding-bottom: 2px;
}
.page-about .ab-role-link:hover {
  color: var(--cyan-500);
  border-bottom-color: var(--cyan-500);
}

/* 图片 */
.page-about .ab-figure {
  margin: 26px 0 0;
}
.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  background: var(--ink-700);
}
.page-about .ab-figcap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--slate-600);
}
.page-about .ab-team-figure {
  margin: 0;
}

/* 版本脉络 */
.page-about .ab-track-wrap {
  margin-top: 30px;
}
.page-about .ab-track {
  list-style: none;
  margin: 0;
  padding: 0 0 22px;
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: var(--cyan-500) transparent;
}
.page-about .ab-node {
  position: relative;
  flex: 0 0 auto;
  width: min(74vw, 238px);
  padding: 56px 24px 0 0;
  scroll-snap-align: start;
}
.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 34px;
  height: 2px;
  background: linear-gradient(90deg, var(--amber-500), rgba(201, 123, 46, .34));
}
.page-about .ab-node:last-child::before {
  background: linear-gradient(90deg, var(--amber-500) 0 62%, var(--rose-500) 100%);
}
.page-about .ab-node-dot {
  position: absolute;
  left: 0;
  top: 28px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--amber-500);
  box-shadow: 0 0 0 4px rgba(201, 123, 46, .18);
}
.page-about .ab-node:last-child .ab-node-dot {
  background: var(--rose-500);
  box-shadow: 0 0 0 4px rgba(184, 92, 110, .22);
}
.page-about .ab-node-v {
  position: absolute;
  left: 0;
  top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--slate-600);
}
.page-about .ab-node-name {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 18px;
  color: var(--ink-900);
  margin: 0 0 8px;
}
.page-about .ab-node-move {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate-600);
}
.page-about .ab-node-more {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  padding-left: 10px;
  border-left: 2px solid var(--line-cyan);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-700);
  transition: max-height .34s var(--ease), opacity .28s var(--ease), margin-top .3s var(--ease);
}
.page-about .ab-node:hover .ab-node-more,
.page-about .ab-node:focus .ab-node-more,
.page-about .ab-node:focus-within .ab-node-more {
  max-height: 160px;
  opacity: 1;
  margin-top: 12px;
}
.page-about .ab-node:focus-visible {
  outline: 2px solid var(--cyan-500);
  outline-offset: 6px;
  border-radius: var(--radius-sm);
}
.page-about .ab-node:nth-child(1) { transition-delay: 0s; }
.page-about .ab-node:nth-child(2) { transition-delay: .08s; }
.page-about .ab-node:nth-child(3) { transition-delay: .16s; }
.page-about .ab-node:nth-child(4) { transition-delay: .24s; }
.page-about .ab-node:nth-child(5) { transition-delay: .32s; }
.page-about .ab-node:nth-child(6) { transition-delay: .4s; }
.page-about .ab-line-figure {
  margin-top: 28px;
}

/* 季度校验 */
.page-about .ab-flow {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .ab-flow-step {
  position: relative;
  padding: 24px 18px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(18, 200, 214, .1), rgba(18, 200, 214, 0) 72%), var(--paper-0);
}
.page-about .ab-flow-step::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 0;
  width: 34px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--cyan-500);
}
.page-about .ab-flow-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--cyan-500);
  margin-bottom: 10px;
}
.page-about .ab-flow-step h3 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 17px;
  color: var(--ink-900);
  margin: 0 0 8px;
}
.page-about .ab-flow-step p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--slate-600);
}

/* 压缩对照 */
.page-about .ab-verdict {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}
.page-about .ab-verdict-col {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--paper-0);
}
.page-about .ab-verdict-col--gain {
  border-left: 4px solid var(--cyan-500);
}
.page-about .ab-verdict-col--cost {
  border-left: 4px solid var(--amber-500);
  background: linear-gradient(180deg, rgba(201, 123, 46, .09), rgba(201, 123, 46, 0) 78%), var(--paper-0);
}
.page-about .ab-verdict-col h3 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 18px;
  color: var(--ink-900);
  margin: 0;
}
.page-about .ab-verdict-col ul {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .ab-verdict-col li {
  position: relative;
  padding-left: 20px;
  font-size: 16px;
  line-height: 1.72;
  color: var(--slate-600);
}
.page-about .ab-verdict-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-500);
}
.page-about .ab-verdict-col--cost li::before {
  background: var(--amber-500);
}

/* 区域与备案 */
.page-about .ab-region {
  display: grid;
  gap: 26px;
  padding: 30px 22px;
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, #0B1A2B, #14304A 68%, #0B1A2B);
  color: var(--paper-100);
  overflow: hidden;
}
.page-about .ab-region-text {
  min-width: 0;
}
.page-about .ab-region-figure {
  margin: 0;
}
.page-about .ab-region .ab-figcap {
  color: rgba(246, 241, 231, .62);
}

/* 阅读顺序 */
.page-about .ab-route {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-route-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
  align-items: start;
}
.page-about .ab-route-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--gold-500);
  padding-top: 6px;
}
.page-about .ab-route-item h3 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 19px;
  margin: 0 0 6px;
}
.page-about .ab-route-item h3 a {
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 2px solid var(--gold-500);
  padding-bottom: 2px;
}
.page-about .ab-route-item h3 a:hover {
  color: var(--gold-500);
}
.page-about .ab-route-item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--slate-600);
}
.page-about .ab-route-extra {
  margin: 24px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate-600);
  max-width: 36em;
}

@media (min-width: 760px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
  .page-about .ab-verdict {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 34px 0 118px;
  }
  .page-about .ab-chapter {
    padding-top: 72px;
  }
  .page-about .ab-grid {
    grid-template-columns: 132px minmax(0, 1fr) 180px;
    gap: 40px;
    align-items: start;
  }
  .page-about .ab-grid--plain {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 44px;
  }
  .page-about .ab-num {
    writing-mode: vertical-rl;
    text-orientation: upright;
    transform: rotate(180deg);
    justify-content: flex-start;
    gap: 16px;
    padding-top: 10px;
    letter-spacing: .28em;
  }
  .page-about .ab-num span:last-child {
    color: var(--slate-600);
  }
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.14fr) minmax(232px, .86fr);
    gap: 34px;
    align-items: start;
  }
  .page-about .ab-role {
    padding: 16px 18px 16px 16px;
  }
  .page-about .ab-region {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
    gap: 42px;
    padding: 44px 38px;
    align-items: center;
  }
}

@media (min-width: 1060px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node,
  .page-about .ab-node-more,
  .page-about .ab-role-link {
    transition: none;
  }
}
<<<END>>>