.page-about {
  --about-line: rgba(30, 51, 85, 0.72);
  --about-band: rgba(18, 167, 155, 0.1);
  background: var(--void-900);
  color: var(--warm);
  overflow-x: hidden;
}

.page-about * {
  box-sizing: border-box;
}

.page-about .breadcrumbs {
  margin-bottom: 18px;
  font-size: 13px;
  color: var(--mist);
}

.page-about .breadcrumbs a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .breadcrumbs .sep {
  margin: 0 8px;
  color: var(--grid);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 3vw, 36px) 0 clamp(28px, 4vw, 48px);
}

.page-about .hero-frame {
  position: relative;
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background:
    radial-gradient(120% 140% at 88% 0%, rgba(53, 240, 216, 0.1), transparent 58%),
    linear-gradient(158deg, rgba(18, 32, 60, 0.82), rgba(4, 7, 15, 0.96) 66%);
  padding: clamp(20px, 3.6vw, 46px);
}

.page-about .hero-frame::before,
.page-about .hero-frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 9px;
  background-image: repeating-linear-gradient(90deg, var(--cyan-deep) 0 1px, transparent 1px 26px);
  opacity: 0.45;
  pointer-events: none;
}

.page-about .hero-frame::before {
  top: 0;
}

.page-about .hero-frame::after {
  bottom: 0;
  background-image: repeating-linear-gradient(90deg, var(--orange) 0 1px, transparent 1px 40px);
  opacity: 0.3;
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .hero-title {
  margin: 14px 0 0;
  font-size: clamp(30px, 4.7vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--warm);
}

.page-about .hero-lead {
  margin: 20px 0 0;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.72;
  color: var(--warm);
  max-width: 36em;
}

.page-about .hero-sub {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 34em;
}

.page-about .hero-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .hero-meta li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  background: rgba(7, 16, 38, 0.92);
}

.page-about .hero-meta-key {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .hero-meta-val {
  font-size: 22px;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .hero-figure {
  position: relative;
  margin: 0;
  padding: 8px;
  border: 1px solid var(--about-line);
  background: var(--void-800);
}

.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.06);
}

.page-about .figure-tag {
  position: absolute;
  right: 8px;
  bottom: 8px;
  padding: 6px 12px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--warm);
  background: rgba(4, 7, 15, 0.82);
  border-left: 2px solid var(--orange);
}

.page-about .figure-tag .num {
  color: var(--orange);
}

/* ---------- 章节锚点条 ---------- */
.page-about .chapter-nav {
  display: flex;
  flex-wrap: wrap;
  margin-top: clamp(22px, 3vw, 34px);
  padding-top: 14px;
  border-top: 1px solid var(--about-line);
}

.page-about .chapter-nav a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 16px;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--mist);
  text-decoration: none;
  border-left: 1px solid var(--about-line);
  transition: color 180ms var(--ease);
}

.page-about .chapter-nav a:first-child {
  padding-left: 0;
  border-left: 0;
}

.page-about .chapter-nav a .num {
  font-size: 12px;
  color: var(--cyan-deep);
}

.page-about .chapter-nav a:hover,
.page-about .chapter-nav a:focus-visible {
  color: var(--cyan);
}

.page-about .chapter-nav a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding: clamp(46px, 6.5vw, 92px) 0;
}

.page-about .section-head {
  max-width: 46em;
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .section-title {
  margin: 12px 0 0;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--warm);
}

.page-about .section-lead {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .text-link {
  display: inline-block;
  margin-top: 22px;
  font-size: 15px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-deep);
  padding-bottom: 2px;
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--warm);
  border-bottom-color: var(--orange);
}

/* ---------- 三类主业 ---------- */
.page-about .duty-grid {
  display: grid;
  gap: 14px;
}

.page-about .duty-card {
  position: relative;
  padding: 24px 22px 20px;
  background: var(--void-800);
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  border-top: 2px solid var(--cyan-deep);
}

.page-about .duty-card:nth-child(2) {
  border-top-color: var(--violet);
}

.page-about .duty-card:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .duty-tag {
  display: inline-block;
  margin-bottom: 14px;
}

.page-about .duty-title {
  margin: 0;
  font-size: 20px;
  line-height: 1.4;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .duty-text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .duty-note {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-line);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
  letter-spacing: 0.01em;
}

/* ---------- 规模数字带 ---------- */
.page-about .stat-strip-wrap {
  padding: clamp(28px, 4vw, 48px) 0;
  background: linear-gradient(90deg, rgba(11, 23, 48, 0.94), rgba(4, 7, 15, 0.6));
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .strip-caption {
  margin: 0 0 16px;
  color: var(--mist);
}

.page-about .stat-strip {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .stat-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--void-800);
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .stat-num--orange {
  color: var(--orange);
}

.page-about .stat-unit {
  font-size: 13px;
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* ---------- 横向色带 ---------- */
.page-about .chapter-band {
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  background: linear-gradient(90deg, var(--about-band), rgba(123, 107, 255, 0.07) 56%, transparent);
  padding: 14px 0;
}

.page-about .chapter-band--violet {
  background: linear-gradient(90deg, rgba(123, 107, 255, 0.12), rgba(255, 124, 46, 0.05) 60%, transparent);
}

.page-about .band-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
}

.page-about .band-index {
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .band-text {
  flex: 1 1 260px;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--warm);
}

.page-about .band-side {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 版本时间轴 ---------- */
.page-about .wide-figure {
  position: relative;
  margin: 0 0 clamp(26px, 3.6vw, 44px);
  border: 1px solid var(--about-line);
  background: var(--void-800);
  overflow: hidden;
}

.page-about .wide-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 300px;
  object-fit: cover;
  opacity: 0.9;
}

.page-about .wide-figure figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 16px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--warm);
  background: rgba(4, 7, 15, 0.8);
  border-top: 1px solid var(--about-line);
  border-right: 1px solid var(--about-line);
}

.page-about .timeline-wrap {
  overflow: hidden;
  padding: 4px 0;
}

.page-about .timeline {
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .tl-item {
  background: var(--void-800);
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--cyan-deep);
  border-radius: var(--r-md);
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .tl-item:hover {
  border-color: rgba(53, 240, 216, 0.45);
}

.page-about .tl-item[open] {
  background: var(--void-700);
  border-left-color: var(--cyan);
}

.page-about .tl-item > summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-year {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .tl-name {
  grid-column: 1;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .tl-item > summary::after {
  grid-column: 2;
  grid-row: 1 / span 2;
  content: "+";
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
  border: 1px solid var(--about-line);
  border-radius: 50%;
}

.page-about .tl-item[open] > summary::after {
  content: "–";
  color: var(--orange);
  border-color: rgba(255, 124, 46, 0.5);
}

.page-about .tl-note {
  padding: 0 18px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队展签卡 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px 18px;
  background: var(--void-800);
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 2px;
  background: var(--cyan);
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  top: 10px;
  right: 12px;
  width: 30px;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 6px);
  opacity: 0.9;
}

.page-about .team-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(32px, 3.6vw, 44px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--warm);
}

.page-about .team-num span {
  margin-left: 6px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .team-role {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--cyan);
}

.page-about .team-text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .team-detail {
  margin-top: 16px;
  border-top: 1px solid var(--about-line);
}

.page-about .team-detail > summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 0 4px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan-deep);
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-detail > summary::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--cyan-deep);
}

.page-about .team-detail[open] > summary {
  color: var(--cyan);
}

.page-about .team-detail > p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 内容体系 ---------- */
.page-about .system-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .system-text {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .archive-panel {
  padding: 22px 20px;
  background: var(--void-800);
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
}

.page-about .archive-title {
  margin: 0 0 16px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

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

.page-about .archive-bar {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding: 12px;
  background: var(--void-900);
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--violet);
}

.page-about .archive-key {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--violet);
  text-align: center;
  border-right: 1px solid var(--about-line);
  padding-right: 10px;
}

.page-about .archive-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .archive-foot {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px dashed var(--about-line);
  padding-top: 14px;
}

/* ---------- 费用明细 ---------- */
.page-about .price-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--about-line);
  background: var(--void-800);
  border-radius: var(--r-md);
}

.page-about table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about caption {
  padding: 14px 16px;
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
  border-bottom: 1px solid var(--about-line);
}

.page-about th {
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--mist);
  background: var(--void-900);
  border-bottom: 1px solid var(--about-line);
  white-space: nowrap;
}

.page-about td {
  padding: 14px 16px;
  line-height: 1.7;
  color: var(--warm);
  border-bottom: 1px solid var(--about-line);
  vertical-align: top;
}

.page-about tbody tr:nth-child(even) {
  background: rgba(11, 23, 48, 0.62);
}

.page-about tbody tr:last-child td {
  border-bottom: 0;
}

.page-about td.num {
  font-family: var(--font-mono);
  color: var(--orange);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.page-about .pricing-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 20px;
}

.page-about .pricing-foot p {
  flex: 1 1 320px;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 服务取向 ---------- */
.page-about .practice-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .practice-item {
  padding: 22px 20px;
  background: var(--void-800);
}

.page-about .practice-num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .practice-title {
  margin: 10px 0 0;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--warm);
}

.page-about .practice-item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 通栏图 ---------- */
.page-about .band-figure {
  position: relative;
  margin: 0;
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  background: var(--void-800);
}

.page-about .band-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
  opacity: 0.86;
}

.page-about .band-figure figcaption {
  position: absolute;
  left: 0;
  top: 0;
  padding: 8px 16px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--warm);
  background: rgba(4, 7, 15, 0.78);
  border-bottom: 1px solid var(--about-line);
  border-right: 1px solid var(--about-line);
}

/* ---------- 收束 ---------- */
.page-about .closing {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .closing-title {
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 800;
}

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

.page-about .closing-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 16px;
  padding: 18px 20px;
  text-decoration: none;
  background: var(--void-800);
  border: 1px solid var(--about-line);
  border-left: 2px solid var(--cyan-deep);
  border-radius: var(--r-md);
  transition: border-color 180ms var(--ease), background 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .closing-link:hover,
.page-about .closing-link:focus-visible {
  background: var(--void-700);
  border-left-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .closing-link:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .closing-key {
  grid-row: 1 / span 2;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .closing-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--warm);
}

.page-about .closing-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

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

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

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

  .page-about .duty-card:first-child {
    grid-column: 1 / -1;
  }

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

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

  .page-about .closing-link {
    grid-template-columns: minmax(0, 1fr);
    align-content: start;
    gap: 8px;
  }

  .page-about .closing-key {
    grid-row: auto;
  }
}

@media (min-width: 920px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

  .page-about .stat-strip {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

  .page-about .duty-card:first-child {
    grid-column: auto;
  }

  .page-about .duty-card:nth-child(2) {
    margin-top: 46px;
  }

  .page-about .duty-card:nth-child(3) {
    margin-top: 22px;
  }

  .page-about .system-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .archive-panel {
    margin-top: 24px;
  }

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

  .page-about .practice-item {
    padding: 28px 24px;
  }

  .page-about .wide-figure img {
    max-height: 340px;
  }
}

@media (min-width: 980px) {
  .page-about .timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    padding: 44px 0 96px;
    align-items: start;
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    left: -3%;
    right: -3%;
    top: 52%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--cyan-deep) 16%, var(--violet) 74%, transparent);
    transform: rotate(-5deg);
    pointer-events: none;
  }

  .page-about .tl-item {
    position: relative;
    z-index: 1;
  }

  .page-about .tl-item:nth-child(even) {
    margin-top: 70px;
  }

  .page-about .tl-note {
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .closing-link {
    transition: none;
  }

  .page-about .closing-link:hover,
  .page-about .closing-link:focus-visible {
    transform: none;
  }
}
<<<END>>>