.page-about {
  --about-aside-w: 200px;
  --about-stamp-w: 240px;
}

.page-about .about-shell {
  padding-top: 20px;
  padding-bottom: 88px;
}

.page-about .crumbs {
  margin-bottom: 20px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  display: grid;
  border: 2px solid var(--line);
  background:
    repeating-linear-gradient(90deg, rgba(55, 226, 198, 0.06) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(0deg, rgba(55, 226, 198, 0.04) 0 1px, transparent 1px 24px),
    var(--panel-2);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, 0.35);
  margin-bottom: 40px;
}

.page-about .hero-stamp {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  border-bottom: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(55, 226, 198, 0.1), transparent 70%);
}

.page-about .stamp-code {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .stamp-big {
  font-family: var(--font-mono);
  font-size: 56px;
  line-height: 1;
  font-weight: 600;
  color: var(--paper);
  letter-spacing: -0.02em;
}

.page-about .stamp-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .stamp-rule {
  display: block;
  height: 1px;
  background: var(--line);
  margin: 4px 0;
}

.page-about .stamp-quote {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--amber-soft);
}

.page-about .hero-main {
  padding: 24px 20px 26px;
}

.page-about .hero-kicker {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 7vw, 48px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .hero-lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 24px;
}

.page-about .stat {
  background: var(--ink-deep);
  padding: 14px 16px;
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  color: var(--cyan);
  line-height: 1.2;
}

.page-about .stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* ---------- 主体：左侧章节轨道 + 右侧叙事 ---------- */
.page-about .about-body {
  display: grid;
  gap: 28px;
}

.page-about .about-aside {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
  scrollbar-width: thin;
}

.page-about .about-aside a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
  padding: 6px 10px;
  border: 1px solid var(--line);
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  transition: color 120ms var(--ease), border-color 120ms var(--ease), background 120ms var(--ease);
}

.page-about .about-aside a .mono {
  color: var(--cyan-deep);
  font-size: 12px;
}

.page-about .about-aside a:hover,
.page-about .about-aside a:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  background: rgba(55, 226, 198, 0.08);
}

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

/* ---------- 章节 ---------- */
.page-about .about-sec {
  border-top: 2px solid var(--line);
  padding-top: 22px;
  margin-bottom: 52px;
  scroll-margin-top: calc(var(--top-h) + 16px);
}

.page-about .about-sec--last {
  margin-bottom: 0;
}

.page-about .sec-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .sec-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 40px;
  line-height: 1;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--cyan);
}

.page-about .sec-head-text {
  min-width: 0;
}

.page-about .sec-kicker {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-sec h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .sec-body p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 66ch;
}

.page-about .sec-body a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .sec-body a:hover {
  color: var(--amber-soft);
}

.page-about .point-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .point-list li {
  position: relative;
  padding: 12px 14px 12px 34px;
  background: var(--panel);
  border-left: 3px solid var(--cyan-deep);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .point-list li::before {
  content: "◆";
  position: absolute;
  left: 14px;
  top: 12px;
  color: var(--cyan);
  font-size: 11px;
}

.page-about .point-list strong {
  color: var(--paper);
  margin-right: 6px;
}

/* ---------- 时间轴 ---------- */
.page-about .tl-media {
  margin: 0 0 24px;
  border: 2px solid var(--line);
  overflow: hidden;
  background: var(--ink-deep);
}

.page-about .tl-media img,
.page-about .team-media img,
.page-about .case-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .media-cap {
  padding: 8px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--line);
  background: var(--panel-2);
}

.page-about .tl-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl-list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--line) 70%, var(--amber));
}

.page-about .tl-item {
  position: relative;
  padding-left: 34px;
  margin-bottom: 14px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 8px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink);
}

.page-about .tl-item--now::before {
  border-color: var(--amber);
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(243, 169, 60, 0.18);
}

.page-about .tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--paper);
  letter-spacing: 0.02em;
  margin-bottom: 6px;
}

.page-about .tl-fold {
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .tl-fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  transition: background 120ms var(--ease), color 120ms var(--ease);
}

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

.page-about .tl-fold summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.page-about .tl-fold[open] summary::after {
  content: "−";
}

.page-about .tl-fold summary:hover {
  background: rgba(55, 226, 198, 0.08);
  color: var(--cyan);
}

.page-about .tl-fold .fold-body {
  padding: 0 14px 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 筛选与老用户服务 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 6px 0 20px;
}

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

.page-about .svc-card {
  border: 2px solid var(--line);
  background: var(--panel);
  padding: 18px;
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.3);
  transition: transform 220ms var(--ease), border-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .svc-card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan-deep);
  box-shadow: 5px 9px 0 rgba(0, 0, 0, 0.35);
}

.page-about .svc-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.page-about .svc-code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .svc-name {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .svc-card p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .svc-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}

.page-about .svc-steps li {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .svc-steps li::before {
  content: "›";
  position: absolute;
  left: 4px;
  color: var(--cyan);
  font-family: var(--font-mono);
}

.page-about .svc-path {
  display: grid;
  margin: 22px 0 16px;
  border: 2px solid var(--line);
  background: var(--ink-deep);
}

.page-about .path-step {
  padding: 14px 16px;
  border-top: 2px solid var(--line);
  background: linear-gradient(90deg, rgba(55, 226, 198, 0.06), transparent 70%);
}

.page-about .path-step:first-child {
  border-top: 0;
}

.page-about .path-step strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-bottom: 6px;
}

.page-about .path-step span {
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .svc-apply {
  font-size: 14px;
  color: var(--mist);
}

/* ---------- 团队与复核 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 20px;
  margin-bottom: 22px;
}

.page-about .team-media {
  margin: 0;
  border: 2px solid var(--line);
  overflow: hidden;
  background: var(--ink-deep);
}

.page-about .team-bars {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.page-about .team-bar-row {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) 44px;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .team-bar-row .mono {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--paper);
  text-align: right;
}

.page-about .bar {
  display: block;
  height: 10px;
  background: var(--ink-deep);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.page-about .bar i {
  display: block;
  height: 100%;
}

.page-about .bar-cyan {
  background: var(--cyan);
}

.page-about .bar-amber {
  background: var(--amber);
}

.page-about .bar-violet {
  background: var(--violet);
}

.page-about .check-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  counter-reset: check;
}

.page-about .check-flow li {
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  background: var(--panel-2);
  padding: 12px 14px;
}

.page-about .check-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin-bottom: 6px;
}

.page-about .check-flow p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 响应 ---------- */
.page-about .resp-grid {
  display: grid;
  gap: 14px;
  margin: 18px 0;
}

.page-about .resp-item {
  padding: 6px 0 6px 14px;
  border-left: 3px solid var(--cyan);
  background: linear-gradient(90deg, rgba(55, 226, 198, 0.07), transparent 80%);
}

.page-about .resp-item h3 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper);
  line-height: 1.5;
}

.page-about .resp-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .resp-note {
  padding: 14px 16px;
  border: 1px dashed var(--line);
  background: var(--panel-2);
  font-size: 14px;
  color: var(--mist);
}

/* ---------- 案例归档 ---------- */
.page-about .case-media {
  margin: 18px 0 20px;
  border: 2px solid var(--line);
  overflow: hidden;
  background: var(--ink-deep);
}

.page-about .case-list {
  display: grid;
  gap: 10px;
}

.page-about .case-fold {
  border: 2px solid var(--line);
  background: var(--panel);
  transition: border-color 220ms var(--ease);
}

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

.page-about .case-fold summary {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  transition: background 120ms var(--ease);
}

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

.page-about .case-fold summary:hover {
  background: rgba(243, 169, 60, 0.08);
}

.page-about .case-week {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
  border: 1px solid var(--line);
  padding: 2px 8px;
}

.page-about .case-title {
  flex: 1 1 200px;
  min-width: 0;
}

.page-about .case-fold .fold-body {
  padding: 0 16px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .case-more {
  margin-top: 16px;
  font-size: 14px;
}

/* ---------- 下一步 ---------- */
.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 6px 0 22px;
}

.page-about .next-grid {
  display: grid;
  gap: 12px;
}

.page-about .next-card {
  position: relative;
  display: block;
  padding: 18px 44px 18px 18px;
  border: 2px solid var(--line);
  background: var(--panel);
  text-decoration: none;
  transition: border-color 220ms var(--ease), background 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--cyan);
  background: var(--panel-2);
  transform: translateY(-2px);
}

.page-about .next-card h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .next-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  max-width: none;
}

.page-about .next-arrow {
  position: absolute;
  right: 16px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
  transition: transform 220ms var(--ease);
}

.page-about .next-card:hover .next-arrow {
  transform: translateX(4px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .svc-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .path-step {
    border-top: 0;
    border-left: 2px solid var(--line);
  }

  .page-about .path-step:first-child {
    border-left: 0;
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: var(--about-stamp-w) minmax(0, 1fr);
  }

  .page-about .hero-stamp {
    border-bottom: 0;
    border-right: 2px solid var(--line);
    padding: 26px 22px;
  }

  .page-about .stamp-big {
    font-size: 64px;
  }

  .page-about .hero-main {
    padding: 40px 40px 44px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-aside-w) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-aside {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    position: sticky;
    top: calc(var(--top-h) + 24px);
    border-bottom: 0;
    border-left: 2px solid var(--line);
    padding: 0 0 0 0;
  }

  .page-about .about-aside a {
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -2px;
    padding: 8px 10px 8px 12px;
    font-size: 13px;
    color: var(--mist);
  }

  .page-about .about-aside a:hover,
  .page-about .about-aside a:focus-visible {
    border-left-color: var(--cyan);
    background: rgba(55, 226, 198, 0.07);
  }

  .page-about .sec-num {
    font-size: 84px;
    -webkit-text-stroke-width: 2px;
  }

  .page-about .sec-head {
    gap: 22px;
    margin-bottom: 22px;
  }

  .page-about .about-sec h2 {
    font-size: 32px;
  }

  .page-about .about-sec {
    padding-top: 28px;
    margin-bottom: 64px;
  }

  .page-about .team-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 28px;
    align-items: start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .svc-card,
  .page-about .next-card,
  .page-about .next-arrow {
    transition: none;
  }

  .page-about .svc-card:hover,
  .page-about .next-card:hover {
    transform: none;
  }
}
<<<END>>>