.page-about {
  --about-line: rgba(30, 58, 70, .16);
  --about-line-soft: rgba(30, 58, 70, .08);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: clamp(56px, 9vw, 110px);
}

.page-about .about-shell {
  padding-top: clamp(16px, 3vw, 34px);
}

.page-about .breadcrumb {
  margin: 0 0 clamp(18px, 3vw, 34px);
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
}

.page-about .about-kicker {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--slate);
}

.page-about .about-kicker::before {
  content: "";
  flex: none;
  width: 36px;
  height: 2px;
  background: var(--cinnabar);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 15em;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2rem, 6.4vw, 4.05rem);
  line-height: 1.16;
  letter-spacing: .01em;
  color: var(--qingdai);
}

.page-about .about-lead {
  margin: 0;
  max-width: 35em;
  font-size: clamp(1rem, 1.1vw + .72rem, 1.14rem);
  line-height: 1.92;
  color: var(--qingdai-mid);
}

/* 路标数字 */
.page-about .about-figures {
  list-style: none;
  margin: clamp(8px, 1.6vw, 16px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border-top: 2px solid var(--qingdai);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-figure {
  background: var(--paper);
  padding: 16px 14px 18px;
}

.page-about .about-figure-num {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.7rem, 4.6vw, 2.55rem);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--qingdai);
}

.page-about .about-figure-num small {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: .38em;
  margin-left: 3px;
  letter-spacing: 0;
  color: var(--slate);
}

.page-about .about-figure-label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--slate);
}

/* 图片 */
.page-about .about-photo {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: linear-gradient(140deg, var(--mist) 0%, var(--sand) 100%);
  box-shadow: var(--shadow-soft);
}

.page-about .about-photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-photo--hero { aspect-ratio: 16 / 10; }
.page-about .about-photo--wide { aspect-ratio: 3 / 2; }
.page-about .about-photo--tall { aspect-ratio: 4 / 3; }

.page-about .about-hero-photo {
  margin-top: clamp(26px, 4.6vw, 52px);
}

.page-about .about-photo-cap {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--slate);
}

/* 双栏骨架 */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4.4vw, 46px);
  margin-top: clamp(38px, 6.6vw, 82px);
}

.page-about .about-dir {
  border-top: 2px solid var(--qingdai);
  padding-top: 14px;
}

.page-about .about-dir-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--slate);
}

.page-about .about-dir-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
}

.page-about .about-dir-list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--about-line);
  color: var(--qingdai);
  text-decoration: none;
  font-size: .92rem;
  line-height: 1.4;
}

.page-about .about-dir-list a:hover { color: var(--cinnabar); }

.page-about .about-dir-list a:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

.page-about .about-dir-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--cinnabar);
}

/* 章节 */
.page-about .about-flow {
  display: grid;
  gap: clamp(30px, 4.6vw, 54px);
}

.page-about .about-sec {
  scroll-margin-top: 24px;
  padding-top: clamp(26px, 4.2vw, 44px);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-sec:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .sec-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .sec-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--cinnabar);
}

.page-about .sec-title {
  margin: 0;
  max-width: 22em;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  line-height: 1.28;
  color: var(--qingdai);
}

.page-about .sec-lead {
  margin: 0;
  max-width: 36em;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--qingdai-mid);
}

.page-about .prose p {
  margin: 0 0 1.05em;
  max-width: 36em;
  line-height: 1.92;
  color: var(--ink);
}

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

.page-about .prose strong {
  color: var(--qingdai);
  font-weight: 600;
}

/* 服务网络点阵 */
.page-about .net-layout {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .net-map {
  position: relative;
  width: 100%;
  max-width: 400px;
  aspect-ratio: 1 / 1;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--about-line);
  border-radius: 50%;
  background-color: rgba(216, 229, 227, .35);
  background-image: radial-gradient(rgba(30, 58, 70, .18) 1.1px, transparent 1.1px);
  background-size: 16px 16px;
}

.page-about .net-node {
  position: absolute;
  transform: translate(-50%, -50%);
  display: grid;
  justify-items: center;
  gap: 4px;
}

.page-about .net-dot {
  display: block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cinnabar);
  box-shadow: 0 0 0 4px rgba(166, 59, 47, .13);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .net-name {
  display: block;
  font-size: 11px;
  line-height: 1.2;
  white-space: nowrap;
  letter-spacing: .02em;
  color: var(--qingdai);
}

.page-about .net-node:hover .net-dot,
.page-about .net-node:focus-within .net-dot {
  transform: scale(1.35);
  box-shadow: 0 0 0 6px rgba(166, 59, 47, .16);
}

.page-about .net-node:hover .net-name { color: var(--cinnabar); }

.page-about .net-side { display: grid; gap: 14px; }

.page-about .net-note {
  margin: 0;
  max-width: 34em;
  font-size: .96rem;
  line-height: 1.9;
  color: var(--qingdai-mid);
}

.page-about .net-metrics {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .net-metrics li {
  background: var(--paper);
  padding: 12px 8px 13px;
}

.page-about .net-metric-num {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  line-height: 1.1;
  color: var(--pine);
}

.page-about .net-metric-num small {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: .42em;
  margin-left: 2px;
  color: var(--slate);
}

.page-about .net-metric-label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .08em;
  color: var(--slate);
}

/* 认证阶梯 */
.page-about .certify-layout {
  display: grid;
  gap: clamp(20px, 3.2vw, 32px);
}

.page-about .certify-steps {
  display: grid;
  gap: 10px;
}

.page-about .certify-step {
  background: var(--paper-lift);
  border-left: 3px solid var(--pine);
  border-radius: 0 14px 14px 0;
  box-shadow: 0 1px 0 var(--about-line-soft);
  overflow: hidden;
}

.page-about .certify-step > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-head);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--qingdai);
}

.page-about .certify-step > summary::-webkit-details-marker { display: none; }

.page-about .certify-step > summary:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: -2px;
}

.page-about .certify-badge {
  flex: none;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--pine);
  color: var(--paper-lift);
  font-family: var(--font-mono);
  font-size: 12.5px;
}

.page-about .certify-chevron {
  flex: none;
  width: 9px;
  height: 9px;
  margin-left: auto;
  border-right: 2px solid var(--slate);
  border-bottom: 2px solid var(--slate);
  transform: rotate(45deg) translateY(-2px);
  transition: transform .25s var(--ease);
}

.page-about .certify-step[open] .certify-chevron {
  transform: rotate(-135deg) translateY(-2px);
}

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

.page-about .certify-body p {
  margin: 0;
  max-width: 34em;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--qingdai-mid);
}

.page-about .certify-note {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 36em;
  padding: 14px 16px;
  border-left: 3px solid var(--gold);
  background: rgba(231, 213, 182, .28);
  border-radius: 0 12px 12px 0;
  font-size: .94rem;
  line-height: 1.85;
  color: var(--qingdai-mid);
}

/* 团队 */
.page-about .team-grid {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 30px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .team-item {
  padding: 18px 18px 20px;
  border: 1px solid var(--about-line-soft);
  border-top: 3px solid var(--slate);
  border-radius: 14px;
  background: var(--paper-lift);
}

.page-about .team-item:nth-child(2) { border-top-color: var(--pine); }
.page-about .team-item:nth-child(3) { border-top-color: var(--cinnabar); }
.page-about .team-item:nth-child(4) { border-top-color: var(--gold); }

.page-about .team-name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.06rem;
  color: var(--qingdai);
}

.page-about .team-text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--qingdai-mid);
}

.page-about .team-photo { margin-top: 4px; }

/* 时间轴 */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cinnabar) 0%, var(--qingdai) 45%, rgba(30, 58, 70, .14) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 26px;
}

.page-about .tl-item:last-child { padding-bottom: 0; }

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--cinnabar);
}

.page-about .tl-stage {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cinnabar);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.12rem;
  color: var(--qingdai);
}

.page-about .tl-text {
  margin: 0;
  max-width: 34em;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--qingdai-mid);
}

/* 客户场景 */
.page-about .clients {
  display: grid;
  gap: 14px;
}

.page-about .client-card {
  padding: clamp(18px, 3vw, 26px);
  border-radius: 18px;
}

.page-about .client-card--family {
  background: linear-gradient(160deg, rgba(216, 229, 227, .85) 0%, rgba(248, 242, 230, .6) 100%);
  border: 1px solid rgba(46, 91, 78, .18);
}

.page-about .client-card--biz {
  background: linear-gradient(160deg, rgba(231, 213, 182, .62) 0%, rgba(248, 242, 230, .7) 100%);
  border: 1px solid rgba(184, 138, 59, .26);
}

.page-about .client-num {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1;
  color: var(--qingdai);
}

.page-about .client-num small {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: .38em;
  margin-left: 4px;
  color: var(--slate);
}

.page-about .client-title {
  margin: 12px 0 10px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.08rem;
  line-height: 1.45;
  color: var(--qingdai);
}

.page-about .client-text {
  margin: 0 0 14px;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--qingdai-mid);
}

.page-about .client-link {
  display: inline-block;
  font-size: .92rem;
  color: var(--cinnabar);
  text-decoration: none;
  border-bottom: 1px solid rgba(166, 59, 47, .4);
  padding-bottom: 2px;
}

.page-about .client-link:hover { color: var(--cinnabar-deep); border-bottom-color: var(--cinnabar-deep); }
.page-about .client-link:focus-visible { outline: 2px solid var(--cinnabar); outline-offset: 3px; }

.page-about .clients-note {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  max-width: 36em;
  font-size: .95rem;
  line-height: 1.88;
  color: var(--slate);
}

/* 下一步 */
.page-about .about-next {
  margin-top: clamp(38px, 5.6vw, 66px);
  padding: clamp(24px, 4vw, 42px);
  border-radius: 20px;
  background: linear-gradient(150deg, var(--qingdai) 0%, var(--qingdai-deep) 100%);
  color: var(--paper);
}

.page-about .about-next-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-next-title {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .next-link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(248, 242, 230, .22);
  color: var(--paper);
  text-decoration: none;
  font-size: .97rem;
  line-height: 1.5;
}

.page-about .next-list li:last-child .next-link { border-bottom: 0; padding-bottom: 0; }

.page-about .next-link:hover { color: var(--sand); }

.page-about .next-link:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .next-arrow {
  flex: none;
  font-family: var(--font-mono);
  color: var(--gold);
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .team-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .certify-body { padding: 0 18px 20px 60px; }
}

@media (min-width: 720px) {
  .page-about .about-figures { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .certify-step > summary { padding: 17px 20px; }
  .page-about .certify-note { padding: 16px 20px; }
}

@media (min-width: 780px) {
  .page-about .net-layout {
    grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
    align-items: center;
  }
  .page-about .clients { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
}

@media (min-width: 880px) {
  .page-about .certify-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(36px, 4vw, 60px);
    align-items: start;
  }
  .page-about .about-dir {
    position: sticky;
    top: 28px;
  }
  .page-about .about-dir-list { grid-template-columns: minmax(0, 1fr); }
  .page-about .net-layout { grid-template-columns: minmax(0, 400px) minmax(0, 1fr); }
}

@media (min-width: 1080px) {
  .page-about .about-next {
    display: grid;
    grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }
  .page-about .about-next-kicker,
  .page-about .about-next-title { grid-column: 1; }
  .page-about .next-list { grid-column: 2; grid-row: 1 / span 2; }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .net-dot,
  .page-about .certify-chevron { transition: none; }
}
<<<END>>>