.page-about {
  --about-paper-line: rgba(14, 24, 54, 0.16);
  --about-paper-alt: #E4EBFA;
  --about-focus-ring: rgba(43, 227, 210, 0.18);
}

.page-about .about-crumbs {
  padding: clamp(18px, 3vw, 30px) 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: clamp(28px, 5vw, 56px) 0 clamp(44px, 7vw, 84px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(32px, 7.4vw, 68px);
  line-height: 1.08;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  color: var(--muted-soft);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
}

.page-about .phase-rail {
  list-style: none;
  margin: 30px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .phase-rail__item {
  background: var(--indigo);
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  transition: background var(--t) var(--ease);
}

.page-about .phase-rail__item:hover {
  background: var(--about-focus-ring);
}

.page-about .phase-rail__num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .phase-rail__label {
  font-size: 14px;
  color: var(--muted-soft);
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(145deg, rgba(43, 227, 210, 0.16), rgba(255, 179, 82, 0.09) 58%, transparent);
}

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

/* ---------- 通用分区 ---------- */
.page-about .about-block {
  padding: clamp(46px, 8vw, 98px) 0;
}

.page-about .about-block__head {
  max-width: 74ch;
}

.page-about .about-block__title {
  margin: 12px 0 0;
}

.page-about .about-block__note {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  line-height: 1.7;
}

.page-about .about-split {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-split__aside {
  border-left: 2px solid var(--cyan);
  padding-left: 14px;
}

.page-about .about-split__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-split__main h2 {
  margin: 0;
}

.page-about .about-split__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--muted-soft);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-split__main .prose {
  margin-top: 18px;
}

.page-about .about-split__main .prose p {
  margin: 0 0 16px;
  color: var(--muted-soft);
  line-height: 1.85;
}

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

.page-about .about-split__main .prose a.link {
  color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  margin-top: clamp(26px, 4vw, 44px);
  display: grid;
  gap: 1px;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .team-item {
  background: var(--indigo);
  transition: background var(--t) var(--ease);
}

.page-about .team-item[open] {
  background: var(--about-focus-ring);
}

.page-about .team-item__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  color: var(--text);
}

.page-about .team-item__head::-webkit-details-marker {
  display: none;
}

.page-about .team-item__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-item[open] .team-item__head::after {
  content: "−";
}

.page-about .team-item__num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .team-item__name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-about .team-item__body {
  padding: 0 20px 20px;
}

.page-about .team-item__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted-soft);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(43, 227, 210, 0.12), transparent 58%);
}

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

.page-about .about-figure .figure-cap {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
}

.page-about .timeline__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  transition: border-color var(--t) var(--ease);
}

.page-about .timeline__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .timeline__item:hover {
  border-top-color: var(--cyan);
}

.page-about .timeline__marker {
  display: flex;
  justify-content: flex-start;
}

.page-about .timeline__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-size: 12px;
  color: var(--muted);
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .timeline__item:hover .timeline__num {
  color: var(--cyan);
  border-color: var(--cyan);
  background: var(--about-focus-ring);
}

.page-about .timeline__era {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .timeline__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.4vw, 23px);
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: var(--text);
}

.page-about .timeline__text {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted-soft);
}

.page-about .timeline__more {
  margin-top: 14px;
  padding-left: 13px;
  border-left: 2px solid var(--line);
  transition: border-color var(--t) var(--ease);
}

.page-about .timeline__more[open] {
  border-left-color: var(--amber);
}

.page-about .timeline__more > summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

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

.page-about .timeline__more > summary::before {
  content: "▸ ";
}

.page-about .timeline__more[open] > summary::before {
  content: "▾ ";
}

.page-about .timeline__more p {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted-soft);
}

.page-about .timeline__more a.link {
  color: var(--cyan);
}

/* ---------- 服务网络（浅色换气口） ---------- */
.page-about .about-block--network {
  border-top: 1px solid var(--about-paper-line);
  border-bottom: 1px solid var(--about-paper-line);
}

.page-about .band--paper .about-block__note,
.page-about .band--paper .about-split__note {
  color: var(--paper-body);
}

.page-about .band--paper .about-block__title,
.page-about .band--paper .h2,
.page-about .band--paper .about-split__main h2 {
  color: var(--paper-ink);
}

.page-about .network-split {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .network-copy__lead {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper-ink);
}

.page-about .network-copy > p:last-child {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-body);
}

.page-about .geo-grid {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-paper-line);
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.page-about .geo-grid__item {
  background: var(--paper);
  padding: 10px 12px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  transition: background var(--t) var(--ease);
}

.page-about .geo-grid__item:hover {
  background: var(--about-paper-alt);
}

.page-about .geo-grid__num {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--paper-body);
  opacity: 0.72;
}

.page-about .geo-grid__name {
  font-size: 14px;
  color: var(--paper-ink);
}

.page-about .band--paper .about-figure {
  border-color: var(--about-paper-line);
  background: var(--about-paper-alt);
}

.page-about .band--paper .about-figure .figure-cap {
  color: var(--paper-body);
}

/* ---------- 资质与合规 ---------- */
.page-about .cert-glass {
  margin-top: clamp(22px, 3vw, 32px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.page-about .cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .cert-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cert-row:first-child {
  padding-top: 0;
}

.page-about .cert-row__key {
  min-width: 96px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .cert-row__val {
  font-size: 15px;
  color: var(--text);
  letter-spacing: 0.01em;
}

.page-about .cert-more {
  margin-top: 16px;
}

.page-about .cert-more > summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .cert-more > summary::-webkit-details-marker {
  display: none;
}

.page-about .cert-more > summary::before {
  content: "▸ ";
}

.page-about .cert-more[open] > summary::before {
  content: "▾ ";
}

.page-about .cert-dl {
  margin: 14px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 10px;
}

.page-about .cert-dl__row {
  display: grid;
  grid-template-columns: minmax(88px, 120px) minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}

.page-about .cert-dl__row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .cert-dl__row dd {
  margin: 0;
  font-size: 14px;
  color: var(--muted-soft);
}

.page-about .cert-prose {
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 工作节奏（浅色） ---------- */
.page-about .about-block--culture {
  border-top: 1px solid var(--about-paper-line);
}

.page-about .culture-list {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--about-paper-line);
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.page-about .culture-list__item {
  background: var(--paper);
  padding: clamp(18px, 2.6vw, 26px);
  display: grid;
  gap: 8px;
}

.page-about .culture-list__key {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--paper-ink);
}

.page-about .culture-list__val {
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-body);
}

/* ---------- 收束 ---------- */
.page-about .about-outro {
  padding: clamp(44px, 7vw, 88px) 0 clamp(52px, 8vw, 96px);
}

.page-about .data-bar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  overflow: hidden;
}

.page-about .data-bar__item {
  background: var(--indigo);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background var(--t) var(--ease);
}

.page-about .data-bar__item:hover {
  background: var(--about-focus-ring);
}

.page-about .data-bar__num {
  font-size: clamp(22px, 3.6vw, 32px);
  letter-spacing: -0.01em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .data-bar__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-cta {
  margin-top: clamp(26px, 4vw, 40px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .phase-rail {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
    gap: clamp(30px, 4vw, 72px);
  }

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

  .page-about .timeline__item {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 22px;
    padding: 30px 0;
  }

  .page-about .culture-list__item {
    grid-template-columns: 240px minmax(0, 1fr);
    align-items: baseline;
    gap: 28px;
  }
}

@media (min-width: 1000px) {
  .page-about .network-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .network-split .about-figure {
    margin-top: 0;
  }
}
<<<END>>>