.page-about {
  --about-rule: rgba(245, 240, 231, .14);
  --about-rule-paper: rgba(11, 14, 16, .18);
  background: var(--ink-950);
  color: var(--text-high);
  overflow-x: clip;
}

.page-about .container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-muted);
}
.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line-700);
}
.page-about .crumbs a {
  color: var(--text-muted);
  text-decoration: none;
}
.page-about .crumbs a:hover { color: var(--volt); }

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 32px 0 40px;
  border-bottom: var(--bd) solid var(--line-700);
  background:
    radial-gradient(680px 300px at 88% 8%, rgba(34, 227, 211, .12), transparent 70%),
    radial-gradient(520px 320px at 6% 96%, rgba(255, 91, 26, .14), transparent 72%),
    var(--ink-950);
}
.page-about .hero-shell { max-width: 1080px; }
.page-about .about-hero .index-label {
  color: var(--volt);
  margin: 0 0 18px;
}
.page-about .about-hero .display {
  margin: 0 0 20px;
  font-size: clamp(36px, 6.4vw, 76px);
  font-weight: 250;
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--text-high);
}
.page-about .about-hero .lede {
  margin: 0 0 32px;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--line-700);
  border: var(--bd) solid var(--line-700);
}
.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--ink-900);
}
.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--volt);
  font-variant-numeric: tabular-nums;
}
.page-about .stat-unit {
  font-size: 15px;
  margin-left: 4px;
  color: var(--text-muted);
}
.page-about .stat-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-top: 36px;
  padding-bottom: 72px;
}

.page-about .about-rail { min-width: 0; }
.page-about .rail-title { margin: 0 0 12px; }
.page-about .rail-list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 14px;
  border: var(--bd) solid var(--line-700);
  background: var(--ink-900);
  color: var(--text-muted);
  font-size: 13px;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .rail-link .num {
  font-size: 11px;
  color: var(--volt);
}
.page-about .rail-link:hover,
.page-about .rail-link:focus-visible,
.page-about .rail-link.is-current {
  border-color: var(--fox);
  background: var(--ink-800);
  color: var(--text-high);
  outline: none;
}

/* ---------- 通用区块 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 28px;
  min-width: 0;
}
.page-about .flow-block {
  padding: 28px 22px;
  border: var(--bd) solid var(--line-700);
}
.page-about .block--dark {
  background: var(--ink-900);
  color: var(--text-high);
}
.page-about .block--paper {
  background: var(--paper-100);
  color: var(--ink-950);
  border-color: var(--ink-950);
  box-shadow: var(--shadow-hard);
}
.page-about .block-head { max-width: 68ch; }
.page-about .block-head .index-label {
  display: block;
  margin-bottom: 12px;
  color: var(--volt);
}
.page-about .block--paper .block-head .index-label { color: var(--fox-600); }
.page-about .block-head .h-section {
  margin: 0 0 12px;
  font-family: var(--font-section);
  font-size: clamp(21px, 2.8vw, 32px);
  font-weight: 600;
  line-height: 1.25;
}
.page-about .block-head p {
  margin: 0 0 22px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-muted);
}
.page-about .block--paper .block-head p { color: #3C4148; }

.page-about .block-tail {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--about-rule);
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}
.page-about .block--paper .block-tail {
  border-top-color: var(--about-rule-paper);
  color: #3C4148;
}
.page-about .block-tail a {
  color: var(--volt);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
.page-about .block--paper .block-tail a { color: var(--fox-600); }
.page-about .block-tail a:hover { color: var(--fox); }

/* ---------- 图片 ---------- */
.page-about .media {
  margin: 0 0 22px;
  border: var(--bd) solid var(--line-700);
  background: var(--ink-800);
  overflow: hidden;
}
.page-about .block--paper .media { border-color: var(--ink-950); }
.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media--square { aspect-ratio: 1 / 1; }
.page-about .media--square img { height: 100%; }
.page-about .media--center { max-width: 420px; }
.page-about .media-caption {
  padding: 10px 14px;
  border-top: var(--bd) solid var(--line-700);
  background: var(--ink-800);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-muted);
}
.page-about .block--paper .media-caption {
  border-top-color: var(--ink-950);
  background: var(--paper-200);
  color: #3C4148;
}

/* ---------- 团队岗位 ---------- */
.page-about .role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
}
.page-about .role-card {
  padding: 18px 18px 20px;
  border: var(--bd) solid var(--line-700);
  background: var(--ink-800);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .role-card:hover {
  transform: translateY(-4px);
  border-color: var(--fox);
}
.page-about .role-num {
  display: block;
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  color: var(--fox);
  margin-bottom: 12px;
}
.page-about .role-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
}
.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-muted);
}

/* ---------- 西安小板块 ---------- */
.page-about .city-note {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border: var(--bd) solid var(--line-700);
  background: var(--ink-950);
}
.page-about .city-note .media {
  margin: 0;
  border: 0;
  border-bottom: var(--bd) solid var(--line-700);
}
.page-about .city-text { padding: 20px 18px 22px; }
.page-about .city-text .index-label { color: var(--amber); }
.page-about .city-text h3 {
  margin: 10px 0 10px;
  font-size: 18px;
  font-weight: 600;
}
.page-about .city-text p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-muted);
}
.page-about .city-text p:last-child { margin-bottom: 0; }

/* ---------- 三条内容线 ---------- */
.page-about .line-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.page-about .line-item {
  padding: 20px 18px;
  border: var(--bd) solid var(--ink-950);
  background: var(--paper-200);
  box-shadow: var(--shadow-soft);
  transition: transform var(--dur) var(--ease);
}
.page-about .line-item:hover { transform: translateY(-4px); }
.page-about .line-key {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--volt-700);
  margin-bottom: 10px;
}
.page-about .line-item h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 600;
}
.page-about .line-item p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: #3C4148;
}
.page-about .line-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-rule-paper);
  font-size: 13px;
  color: #3C4148;
}
.page-about .line-meta span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  padding: 3px 8px;
  background: var(--fox-600);
  color: var(--paper-100);
}

/* ---------- 校对流程 ---------- */
.page-about .check-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  counter-reset: step;
}
.page-about .check-flow li {
  position: relative;
  padding: 18px 18px 18px 20px;
  border: var(--bd) solid var(--line-700);
  border-left: 4px solid var(--volt);
  background: var(--ink-800);
}
.page-about .check-step {
  display: block;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--volt);
  margin-bottom: 8px;
}
.page-about .check-flow h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
}
.page-about .check-flow p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-muted);
}
.page-about .data-note {
  padding: 18px 20px;
  border: var(--bd) dashed var(--fox);
  background: rgba(255, 91, 26, .08);
}
.page-about .data-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-high);
}
.page-about .data-note strong { color: var(--fox); }

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0 0 6px;
  padding: 4px 0 4px 26px;
  border-left: var(--bd) solid var(--line-700);
}
.page-about .tl-item {
  position: relative;
  padding-bottom: 22px;
}
.page-about .tl-item:last-child { padding-bottom: 0; }
.page-about .tl-dot {
  position: absolute;
  left: -33px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--paper-100);
  border: 3px solid var(--fox);
}
.page-about .tl-item--now .tl-dot {
  background: var(--fox);
  box-shadow: 0 0 0 4px rgba(255, 91, 26, .22);
}
.page-about .tl-card {
  padding: 18px 18px 16px;
  border: var(--bd) solid var(--ink-950);
  background: var(--paper-200);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .tl-card:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-soft);
}
.page-about .tl-ver {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  padding: 3px 9px;
  background: var(--ink-950);
  color: var(--volt);
  margin-bottom: 10px;
}
.page-about .tl-item--now .tl-ver { background: var(--fox); color: var(--paper-100); }
.page-about .tl-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
}
.page-about .tl-card p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: #3C4148;
}
.page-about .tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .tl-tags li {
  font-size: 12px;
  padding: 4px 9px;
  border: 1px solid var(--ink-950);
  color: var(--ink-950);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-about .tl-card:hover .tl-tags li {
  background: var(--fox);
  color: var(--paper-100);
  border-color: var(--fox);
}

/* ---------- 覆盖与合作 ---------- */
.page-about .cov-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  background: var(--line-700);
  border: var(--bd) solid var(--line-700);
}
.page-about .cov-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  background: var(--ink-950);
}
.page-about .cov-num {
  font-size: 28px;
  font-weight: 600;
  line-height: 1;
  color: var(--volt);
}
.page-about .cov-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
}

.page-about .coop {
  padding-top: 20px;
  border-top: 1px solid var(--about-rule);
}
.page-about .coop h3 {
  margin: 0 0 16px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: .04em;
}
.page-about .coop-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .coop-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.page-about .coop-num {
  flex: 0 0 auto;
  min-width: 62px;
  font-size: 22px;
  font-weight: 600;
  color: var(--fox);
  line-height: 1.2;
}
.page-about .coop-list h4 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
}
.page-about .coop-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-muted);
}

/* ---------- 服务与响应 ---------- */
.page-about .service-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
}
.page-about .service-list li {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px 18px;
  border: var(--bd) solid var(--ink-950);
  background: var(--paper-200);
}
.page-about .service-list h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}
.page-about .service-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: #3C4148;
}
.page-about .service-list .btn { align-self: flex-start; }

.page-about .response-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding: 20px 20px;
  border: var(--bd) solid var(--ink-950);
  background: var(--ink-950);
  color: var(--text-high);
  box-shadow: var(--shadow-soft);
}
.page-about .response-num {
  margin: 0;
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--volt);
}
.page-about .response-text {
  flex: 1 1 220px;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-muted);
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-cta {
  padding: 30px 22px;
  border: var(--bd) solid var(--fox);
  background:
    linear-gradient(135deg, rgba(255, 91, 26, .18), transparent 55%),
    var(--ink-900);
}
.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-family: var(--font-section);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 600;
  line-height: 1.3;
}
.page-about .about-cta p {
  margin: 0 0 22px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-muted);
}
.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .role-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .cov-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .check-flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .service-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .line-list { gap: 16px; }
  .page-about .city-note { grid-template-columns: 1fr 1fr; }
  .page-about .city-note .media {
    border-bottom: 0;
    border-right: var(--bd) solid var(--line-700);
    height: 100%;
  }
  .page-about .city-note .media img { height: 100%; }
}

/* ---------- 桌面：左侧吸顶索引 + 右侧正文流 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero { padding: 44px 0 52px; }
  .page-about .hero-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .about-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 48px;
    padding-top: 48px;
  }
  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }
  .page-about .rail-list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .rail-link {
    justify-content: flex-start;
    width: 100%;
    white-space: normal;
  }
  .page-about .about-flow { gap: 36px; }
  .page-about .flow-block { padding: 36px 34px; }
  .page-about .role-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .line-list { gap: 18px; }
  .page-about .check-flow { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .media--center { max-width: 520px; }
  .page-about .about-cta { padding: 40px 36px; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}
<<<END>>>