.page-about {
  background: var(--cream);
  color: var(--text);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(130% 150% at 8% -10%, #10404f 0%, var(--ink) 52%, #04141a 100%);
  color: var(--cream);
  padding: clamp(22px, 5vw, 40px) 0 clamp(36px, 6vw, 68px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -18%;
  top: -30%;
  width: 70vw;
  max-width: 720px;
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(0, 201, 167, .34), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -10%;
  bottom: -55%;
  width: 58vw;
  max-width: 560px;
  aspect-ratio: 1;
  background: radial-gradient(circle at 50% 50%, rgba(23, 120, 242, .28), transparent 65%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-crumb {
  margin-bottom: clamp(20px, 4vw, 34px);
}

.page-about .about-crumb .breadcrumb-link,
.page-about .about-crumb .breadcrumb-item {
  color: rgba(245, 241, 232, .62);
}

.page-about .about-crumb .breadcrumb-link:hover {
  color: var(--glass);
}

.page-about .about-hero-title {
  margin: 16px 0 0;
  font-size: clamp(32px, 7.4vw, 72px);
  line-height: 1.06;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--cream);
}

.page-about .about-hero-title em {
  font-style: normal;
  display: block;
  margin-top: 6px;
  background: linear-gradient(100deg, var(--glass) 0%, var(--teal) 45%, var(--blue) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero-lede {
  margin: 20px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.85;
  color: rgba(245, 241, 232, .84);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: clamp(26px, 4.5vw, 42px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(245, 241, 232, .16);
  border-radius: 16px;
  overflow: hidden;
}

.page-about .about-stat {
  background: rgba(7, 28, 36, .72);
  padding: 16px 16px 18px;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--glass);
}

.page-about .about-stat-cap {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(245, 241, 232, .62);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  padding-top: clamp(30px, 5vw, 52px);
  padding-bottom: clamp(48px, 7vw, 84px);
}

.page-about .about-toc {
  min-width: 0;
}

.page-about .about-toc-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--clay);
}

.page-about .about-toc-list {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-toc-item {
  flex: 0 0 auto;
}

.page-about .about-toc-link {
  display: block;
  padding: 8px 13px;
  border-radius: 999px;
  border: 1px solid rgba(7, 28, 36, .13);
  background: var(--cream-2);
  color: var(--rock);
  font-size: 13px;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur), border-color var(--dur), background-color var(--dur);
}

.page-about .about-toc-link:hover {
  color: var(--ink);
  border-color: rgba(0, 201, 167, .6);
}

.page-about .about-toc-link.is-active {
  color: var(--ink);
  font-weight: 700;
  border-color: var(--teal);
  background: rgba(0, 201, 167, .16);
}

.page-about .about-content {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-bottom: clamp(32px, 5.5vw, 58px);
  border-bottom: 1px solid rgba(7, 28, 36, .11);
  margin-bottom: clamp(32px, 5.5vw, 58px);
}

.page-about .about-section--last {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-section-title {
  margin: 12px 0 0;
  font-size: clamp(23px, 4vw, 38px);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--ink);
}

.page-about .about-section .lede {
  margin-top: 14px;
  font-size: clamp(15.5px, 1.7vw, 18px);
  line-height: 1.8;
  color: #23434c;
}

.page-about .about-section p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: #1d3b44;
}

.page-about .about-section p a {
  color: var(--teal-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-section p a:hover {
  color: var(--blue);
}

/* ---------- 图片 ---------- */
.page-about .media-frame {
  margin: clamp(20px, 3.4vw, 30px) 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-soft);
  box-shadow: var(--shadow);
}

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

.page-about .media-caption {
  margin: 0;
  padding: 11px 15px 13px;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(245, 241, 232, .72);
  background: var(--ink-soft);
}

/* ---------- 旁注 ---------- */
.page-about .note {
  margin: clamp(18px, 3vw, 26px) 0 0;
}

.page-about .note strong {
  display: block;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--ink);
  margin-bottom: 6px;
}

.page-about .note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-flow-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 16px;
  background: #fff;
  border: 1px solid rgba(7, 28, 36, .08);
  border-radius: 14px;
}

.page-about .about-flow-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 19px;
  font-weight: 700;
  color: var(--teal-deep);
  line-height: 1.3;
}

.page-about .about-flow-body strong {
  display: block;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.45;
}

.page-about .about-flow-body p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

/* ---------- 折叠说明 ---------- */
.page-about .about-details {
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 14px 18px 15px;
  background: var(--cream-2);
  border-left: 3px solid var(--clay);
  border-radius: 0 12px 12px 0;
}

.page-about .about-details summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 8px;
}

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

.page-about .about-details summary::before {
  content: "+";
  font-family: var(--font-num);
  font-size: 16px;
  color: var(--clay);
  flex: 0 0 auto;
}

.page-about .about-details[open] summary::before {
  content: "−";
}

.page-about .about-details p {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: #2c4b53;
}

/* ---------- 归档层次 ---------- */
.page-about .about-layers {
  margin: 22px 0 0;
  display: grid;
  gap: 12px;
}

.page-about .about-layer {
  padding: 16px 17px;
  background: #fff;
  border: 1px solid rgba(7, 28, 36, .08);
  border-radius: 14px;
}

.page-about .about-layer .tag {
  display: inline-block;
}

.page-about .about-layer strong {
  display: block;
  margin-top: 9px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-layer p {
  margin: 7px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

.page-about .about-zones {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-zone {
  padding: 6px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid rgba(7, 28, 36, .13);
  font-size: 12.5px;
  color: var(--rock);
}

.page-about .about-zone.is-default {
  background: rgba(0, 201, 167, .16);
  border-color: var(--teal);
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin: 22px 0 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team-item {
  padding: 15px 16px;
  border-radius: 14px;
  background: #fff;
  border-top: 2px solid var(--moss);
  box-shadow: 0 12px 26px -22px rgba(7, 28, 36, .8);
}

.page-about .about-team-role {
  margin: 0;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.4;
}

.page-about .about-team-item p:not(.about-team-role) {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--rock);
}

/* ---------- 里程碑 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-mile {
  position: relative;
  padding: 16px 16px 14px;
  background: #fff;
  border: 1px solid rgba(7, 28, 36, .08);
  border-radius: 14px;
  transition: border-color var(--dur), transform var(--dur), box-shadow var(--dur);
}

.page-about .about-mile:hover,
.page-about .about-mile:focus-within {
  border-color: var(--teal);
  transform: translateY(-3px);
  box-shadow: 0 18px 30px -24px rgba(7, 28, 36, .9);
}

.page-about .about-mile-num {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--coral);
}

.page-about .about-mile-title {
  margin: 7px 0 0;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .about-mile-more {
  margin-top: 9px;
}

.page-about .about-mile-more summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid rgba(7, 28, 36, .14);
  font-size: 12px;
  color: var(--rock);
  transition: color var(--dur), border-color var(--dur);
}

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

.page-about .about-mile-more summary::after {
  content: "↓";
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--teal-deep);
}

.page-about .about-mile-more[open] summary::after {
  content: "↑";
}

.page-about .about-mile-more summary:hover {
  color: var(--ink);
  border-color: var(--teal);
}

.page-about .about-mile-more p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: #2c4b53;
}

.page-about .about-mile-link {
  margin-top: 18px;
  font-size: 14.5px;
  color: var(--rock);
}

/* ---------- 规模 ---------- */
.page-about .about-scale-grid {
  margin: 22px 0 0;
  display: grid;
  gap: 1px;
  background: rgba(7, 28, 36, .14);
  border-radius: 16px;
  overflow: hidden;
}

.page-about .about-scale-cell {
  background: var(--cream-2);
  padding: 18px 17px 20px;
}

.page-about .about-scale-num {
  margin: 0;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 6vw, 46px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--ink);
}

.page-about .about-scale-cap {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--rock);
}

.page-about .about-cta-row {
  margin: clamp(22px, 3.6vw, 32px) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

  .page-about .about-flow-item {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 16px;
    padding: 17px 18px;
  }

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

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

@media (min-width: 860px) {
  .page-about .about-layers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
    align-items: start;
  }

  .page-about .about-mile {
    padding: 15px 14px 13px;
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: 212px minmax(0, 1fr);
    gap: clamp(30px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
  }

  .page-about .about-toc-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
    border-left: 1px solid rgba(7, 28, 36, .14);
  }

  .page-about .about-toc-link {
    border: 0;
    background: none;
    border-radius: 0;
    padding: 9px 0 9px 14px;
    margin-left: -1px;
    border-left: 2px solid transparent;
    font-size: 13.5px;
    white-space: normal;
    transition: color var(--dur), border-color var(--dur);
  }

  .page-about .about-toc-link.is-active {
    background: none;
    border-left-color: var(--teal);
    color: var(--ink);
  }

  .page-about .about-section .lede {
    max-width: 62ch;
  }

  .page-about .about-section p {
    max-width: 68ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-mile,
  .page-about .about-toc-link,
  .page-about .about-mile-more summary {
    transition: none;
  }

  .page-about .about-mile:hover,
  .page-about .about-mile:focus-within {
    transform: none;
  }
}
<<<END>>>