.page-about {
  position: relative;
  overflow-x: clip;
  background:
    radial-gradient(120% 78% at 8% -12%, rgba(34, 211, 238, 0.16), transparent 62%),
    radial-gradient(90% 66% at 102% 6%, rgba(163, 230, 53, 0.07), transparent 64%),
    var(--ink-900);
  color: var(--text);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-glow {
  position: absolute;
  top: -140px;
  right: -12%;
  width: 64%;
  height: 580px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.2), rgba(10, 20, 40, 0) 68%);
  clip-path: polygon(24% 0, 100% 0, 76% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .crumbs,
.page-about .about-hero,
.page-about .about-body,
.page-about .closing {
  position: relative;
  z-index: 1;
}

.page-about p {
  line-height: 1.85;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: clamp(20px, 4vw, 34px) 0 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .crumbs a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease);
}

.page-about .crumbs a:hover {
  border-bottom-color: var(--cyan);
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(20px, 3.5vw, 40px);
}

.page-about .hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .hero-copy h1 {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 6.2vw, 4.1rem);
  line-height: 1.04;
  letter-spacing: 0.01em;
  max-width: 20ch;
}

.page-about .hero-copy .eyebrow {
  color: var(--cyan);
}

.page-about .lead {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.5vw, 1.14rem);
  line-height: 1.85;
  color: #cddef3;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 15px 16px;
  background: var(--panel);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(1.32rem, 2.8vw, 1.9rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .stat-label {
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .hero-band {
  margin: clamp(22px, 3.6vw, 38px) 0 0;
  padding: 11px clamp(18px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.07em;
  color: var(--ink-900);
  background: linear-gradient(90deg, var(--cyan), var(--lime));
  clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.page-about .figure {
  margin: 0;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .figure--wide {
  aspect-ratio: 16 / 9;
}

.page-about .figure--square {
  aspect-ratio: 1 / 1;
}

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

.page-about .hero-figure {
  border: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  box-shadow: var(--shadow-lift);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding-top: clamp(38px, 6vw, 74px);
}

.page-about .grid--rail {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 56px);
}

.page-about .rail {
  display: none;
}

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

/* ---------- 章节通用 ---------- */
.page-about .flow-section {
  scroll-margin-top: 104px;
  padding: clamp(36px, 6vw, 70px) 0;
  border-top: 1px dashed var(--line);
}

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

.page-about .section-head {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .sec-index {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--amber);
  border: 1px solid rgba(245, 165, 36, 0.45);
}

.page-about .section-head .eyebrow {
  margin: 0 0 8px;
  color: var(--cyan);
}

.page-about .section-head h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.1vw, 2.25rem);
  line-height: 1.16;
  max-width: 24ch;
}

.page-about .section-lead {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 1rem;
}

/* ---------- 01 业务起点 ---------- */
.page-about .origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .prose p {
  margin: 0 0 1.1em;
  max-width: 64ch;
  font-size: 1.02rem;
}

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

.page-about .origin-note {
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .note-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .note-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .note-list li {
  padding-left: 16px;
  position: relative;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.page-about .note-list strong {
  display: block;
  color: var(--text);
  font-weight: 600;
}

/* ---------- 02 内容体系 ---------- */
.page-about .col-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .col-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .col-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .col-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .col-role {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .col-points {
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
  font-size: 0.86rem;
  line-height: 1.7;
  color: #b9cbe4;
}

.page-about .col-points li {
  position: relative;
  padding-left: 16px;
}

.page-about .col-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.page-about .system-visual {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(22px, 3.4vw, 38px);
  align-items: center;
}

.page-about .system-note .eyebrow {
  color: var(--lime);
  margin: 0 0 10px;
}

.page-about .system-note p:last-child {
  margin: 0;
  max-width: 58ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 03 数据校验 ---------- */
.page-about .flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .flow-step {
  position: relative;
  padding: clamp(20px, 2.6vw, 28px);
  padding-top: calc(clamp(20px, 2.6vw, 28px) + 8px);
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 52px;
  height: 2px;
  background: var(--cyan);
}

.page-about .step-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--cyan-soft);
}

.page-about .flow-step h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 700;
}

.page-about .flow-step p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 04 团队构成 ---------- */
.page-about .team-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .team-bar {
  display: grid;
  gap: 10px;
}

.page-about .bar-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .bar-label {
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .bar-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-bar--wide .bar-value {
  color: var(--lime);
}

.page-about .bar-track {
  height: 6px;
  background: var(--panel-2);
  border-left: 2px solid var(--line);
  overflow: hidden;
}

.page-about .bar-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--cyan-soft));
}

.page-about .team-bar--wide .bar-fill {
  background: linear-gradient(90deg, var(--lime), var(--cyan));
}

.page-about .team-bar:nth-child(1) .bar-fill {
  width: 58%;
}

.page-about .team-bar:nth-child(2) .bar-fill {
  width: 24%;
}

.page-about .team-bar:nth-child(3) .bar-fill {
  width: 18%;
}

.page-about .team-bar--wide .bar-fill {
  width: 100%;
}

.page-about .bar-note {
  margin: 0;
  max-width: 62ch;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 05 版本演进 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 2.8vw, 28px);
}

.page-about .tl-node {
  position: relative;
  padding-top: 34px;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  top: 12px;
  left: 0;
  right: 0;
  border-top: 1px dashed var(--line);
}

.page-about .tl-node::after {
  content: "";
  position: absolute;
  top: 6px;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.16);
}

.page-about .tl-version {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--cyan-soft);
}

.page-about .tl-name {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 1.14rem;
  font-weight: 700;
}

.page-about .tl-desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 06 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 22px);
}

.page-about .partner-card {
  padding: clamp(20px, 2.8vw, 30px);
}

.page-about .partner-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1;
  color: var(--lime);
}

.page-about .partner-card h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
}

.page-about .partner-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .partner-honor {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  padding: 12px 18px;
  border-left: 3px solid var(--amber);
  background: rgba(245, 165, 36, 0.07);
  font-size: 0.9rem;
  line-height: 1.75;
  color: #d8e6f8;
}

/* ---------- 07 区域服务 ---------- */
.page-about .region-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  align-items: center;
}

.page-about .region-figure {
  aspect-ratio: 3 / 2;
  border: 0;
  clip-path: polygon(20px 0, 100% 0, 100% 100%, 0 100%, 0 20px);
}

.page-about .region-copy p {
  margin: 0 0 1em;
  max-width: 60ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .region-copy p:last-of-type {
  margin-bottom: 0;
}

.page-about .contact-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- 收尾 ---------- */
.page-about .closing {
  padding-top: clamp(40px, 6vw, 82px);
}

.page-about .closing-panel {
  padding: clamp(24px, 4vw, 48px);
}

.page-about .closing-panel .eyebrow {
  color: var(--amber);
  margin: 0 0 10px;
}

.page-about .closing-panel h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.2vw, 2.3rem);
  line-height: 1.16;
  max-width: 22ch;
}

.page-about .closing-text {
  margin: 0 0 22px;
  max-width: 66ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .col-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 820px) {
  .page-about .flow-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(22px, 3vw, 32px);
  }
}

@media (min-width: 960px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .system-visual {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .region-band {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

@media (min-width: 1024px) {
  .page-about .grid--rail {
    grid-template-columns: minmax(170px, 3fr) 9fr;
    align-items: start;
  }

  .page-about .rail {
    display: grid;
    gap: 2px;
    position: sticky;
    top: 108px;
    align-self: start;
    border-left: 1px solid var(--line);
  }

  .page-about .rail-link {
    display: block;
    padding: 9px 14px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    color: var(--muted);
    text-decoration: none;
    border-left: 2px solid transparent;
    margin-left: -1px;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
  }

  .page-about .rail-link:hover {
    color: var(--text);
  }

  .page-about .rail-link[aria-current] {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: linear-gradient(90deg, rgba(34, 211, 238, 0.14), rgba(34, 211, 238, 0));
  }

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

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