.page-about {
  background-color: var(--black);
  color: var(--white);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: center top;
  overflow-x: hidden;
}

.page-about .crumbs {
  margin-bottom: 18px;
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 5vw, 56px) 0 clamp(26px, 4vw, 54px);
}

.page-about .hero-frame {
  position: relative;
  margin-top: 6px;
  padding: clamp(20px, 4vw, 52px) clamp(18px, 3.4vw, 46px);
  border: 1px solid var(--line);
  background:
    linear-gradient(158deg, rgba(43, 27, 107, 0.55) 0%, rgba(3, 43, 47, 0.85) 58%, rgba(7, 11, 18, 0.96) 100%);
  box-shadow: inset 0 0 0 1px rgba(0, 229, 204, 0.06);
}

.page-about .hero-frame::before,
.page-about .hero-frame::after {
  content: "";
  position: absolute;
  height: 3px;
  width: clamp(52px, 14vw, 140px);
}

.page-about .hero-frame::before {
  top: -1px;
  left: -1px;
  background: var(--cyan);
}

.page-about .hero-frame::after {
  bottom: -1px;
  right: -1px;
  background: var(--blue);
}

.page-about .hero-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 6.4vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 10px 0 18px;
  color: var(--white);
  text-shadow: 0 0 26px rgba(10, 108, 255, 0.28);
}

.page-about .hero-lead {
  max-width: 64ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: #cfdaea;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3.4vw, 38px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .stat-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 13px 14px 15px;
  background: var(--black);
  border-left: 2px solid transparent;
  transition: border-color 240ms var(--ease), background-color 240ms var(--ease);
}

.page-about .stat-card:hover {
  border-left-color: var(--cyan);
  background: rgba(0, 229, 204, 0.06);
}

.page-about .stat-num {
  font-family: var(--font-num);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.page-about .stat-unit {
  font-size: 0.44em;
  font-style: normal;
  margin-left: 2px;
  color: var(--amber);
  opacity: 0.9;
}

.page-about .stat-label {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

/* ---------- 主体：索引 + 叙事 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(18px, 3vw, 40px);
  padding-bottom: clamp(40px, 7vw, 96px);
}

.page-about .side-index {
  border-top: 1px solid var(--line-cyan);
  border-bottom: 1px solid var(--line);
  padding: 10px 0 12px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .index-cap {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .index-list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 7px 11px;
  border: 1px solid var(--line);
  color: var(--steel);
  font-size: 12.5px;
  text-decoration: none;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  color: var(--white);
  border-color: var(--line-cyan);
  background: var(--glass);
}

.page-about .index-num {
  font-family: var(--font-num);
  font-style: italic;
  font-size: 11px;
  color: var(--amber);
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(20px, 3vw, 30px);
  margin-bottom: clamp(32px, 5vw, 62px);
  scroll-margin-top: 92px;
}

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

.page-about .chapter-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: clamp(14px, 2.2vw, 22px);
}

.page-about .chapter-num {
  font-family: var(--font-num);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  flex: 0 0 auto;
}

.page-about .chapter-title {
  position: relative;
  flex: 1 1 auto;
  margin: 0;
  padding-bottom: 12px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 38px);
  line-height: 1.16;
  color: var(--white);
}

.page-about .chapter-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--line-cyan), rgba(0, 229, 204, 0.05) 62%, transparent);
}

.page-about .chapter-body > p {
  margin: 0 0 15px;
  font-size: 15px;
  line-height: 1.85;
  color: #ccd7e5;
}

.page-about .chapter-body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 204, 0.4);
  transition: border-color 200ms var(--ease), color 200ms var(--ease);
}

.page-about .chapter-body a:hover,
.page-about .chapter-body a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

.page-about .chapter-tail {
  margin-top: 18px !important;
  padding-left: 14px;
  border-left: 2px solid var(--amber);
  font-size: 14px !important;
  color: var(--steel) !important;
}

/* ---------- 引用卡 ---------- */
.page-about .quote-card {
  margin: 22px 0;
  padding: clamp(16px, 2.6vw, 26px);
  border: 1px solid var(--line-cyan);
  border-left: 3px solid var(--cyan);
  background: var(--glass);
  backdrop-filter: blur(6px);
}

.page-about .quote-card p {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 23px);
  line-height: 1.5;
  color: var(--white);
}

.page-about .quote-card cite {
  display: block;
  font-size: 12px;
  font-style: normal;
  letter-spacing: 0.12em;
  color: var(--steel);
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  margin: 0 0 22px;
  border: 1px solid var(--line);
  background: var(--navy);
  overflow: hidden;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.02);
}

.page-about .media-frame__cap {
  padding: 9px 12px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
  border-top: 1px solid var(--line-soft);
  background: rgba(7, 11, 18, 0.72);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 4px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--blue) 62%, transparent);
}

.page-about .tl-item {
  position: relative;
  padding: 12px 14px 14px;
  margin-bottom: 12px;
  border: 1px solid transparent;
  border-left: 1px solid var(--line);
  background: rgba(11, 27, 51, 0.42);
  transition: background-color 240ms var(--ease), border-color 240ms var(--ease), transform 240ms var(--ease);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 18px;
  width: 12px;
  height: 12px;
  background: var(--cyan);
  transform: skewX(-18deg);
  transition: background-color 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .tl-item:hover {
  background: rgba(43, 27, 107, 0.38);
  border-color: var(--line);
  border-left-color: var(--cyan);
}

.page-about .tl-item:hover::before {
  background: var(--amber);
  box-shadow: 0 0 14px rgba(255, 176, 32, 0.55);
}

.page-about .tl-stage {
  display: inline-block;
  margin-bottom: 6px;
  padding: 2px 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  border: 1px solid var(--line-cyan);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .tl-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .team-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: #ccd7e5;
}

.page-about .role-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .role-card {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 12px 13px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--blue);
  background: rgba(0, 229, 204, 0.06);
  backdrop-filter: blur(4px);
}

.page-about .role-num {
  font-family: var(--font-num);
  font-style: italic;
  font-weight: 900;
  font-size: 24px;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .role-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--white);
}

.page-about .role-desc {
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 节奏表 ---------- */
.page-about .table-scroll {
  margin: 18px 0 24px;
  overflow-x: auto;
  border: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}

.page-about .data-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 13px;
}

.page-about .data-table th,
.page-about .data-table td {
  padding: 11px 13px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .data-table thead th {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  background: rgba(11, 27, 51, 0.9);
  font-weight: 700;
}

.page-about .data-table tbody tr:nth-child(even) {
  background: rgba(0, 229, 204, 0.05);
}

.page-about .data-table tbody tr:hover {
  background: rgba(10, 108, 255, 0.14);
}

.page-about .data-table td:first-child {
  color: var(--white);
  font-weight: 700;
}

.page-about .data-table td {
  color: #bfcbdb;
  line-height: 1.65;
}

/* ---------- 服务承诺小卡 ---------- */
.page-about .promise-grid {
  display: grid;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .promise-card {
  padding: 15px 16px;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(3, 43, 47, 0.75), rgba(7, 11, 18, 0.9));
}

.page-about .promise-card h3 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.01em;
}

.page-about .promise-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: #c2cedd;
}

/* ---------- 合作 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .partner-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: #ccd7e5;
}

.page-about .partner-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-cyan);
}

.page-about .partner-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 2px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 13.5px;
  color: #c2cedd;
}

.page-about .pl-k {
  flex: 0 0 auto;
  min-width: 68px;
  font-family: var(--font-num);
  font-style: italic;
  font-weight: 900;
  font-size: 15px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- CTA ---------- */
.page-about .chapter--cta {
  border-top: 1px solid var(--line-cyan);
  margin-bottom: 0;
}

.page-about .about-cta {
  padding: clamp(20px, 3.6vw, 40px);
  border: 1px solid var(--line-cyan);
  background:
    linear-gradient(128deg, rgba(43, 27, 107, 0.9) 0%, rgba(10, 71, 168, 0.42) 52%, rgba(3, 43, 47, 0.92) 100%);
}

.page-about .cta-title {
  margin: 8px 0 12px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 36px);
  line-height: 1.16;
  color: var(--white);
}

.page-about .cta-lead {
  max-width: 60ch;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-size: 14.5px;
  line-height: 1.8;
  color: #ccd7e5;
}

.page-about .cta-links {
  display: grid;
  gap: 10px;
}

.page-about .cta-link {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 15px;
  text-decoration: none;
  border: 1px solid var(--line);
  background: rgba(7, 11, 18, 0.66);
  transition: border-color 220ms var(--ease), background-color 220ms var(--ease), transform 220ms var(--ease);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  border-color: var(--cyan);
  background: rgba(0, 229, 204, 0.1);
  transform: translateY(-2px);
}

.page-about .cta-link-k {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .cta-link-d {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--steel);
}

.page-about .cta-link-a {
  margin-top: 2px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

/* ---------- 返回顶部兜底 ---------- */
.page-about .to-top {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 40;
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-cyan);
  background: rgba(11, 27, 51, 0.92);
  color: var(--cyan);
  cursor: pointer;
  transition: opacity 220ms var(--ease), visibility 220ms var(--ease), border-color 220ms var(--ease);
}

.page-about .to-top[data-visible="false"] {
  opacity: 0;
  visibility: hidden;
}

.page-about .to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
}

.page-about .to-top:hover,
.page-about .to-top:focus-visible {
  border-color: var(--amber);
  color: var(--amber);
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 640px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

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

@media (min-width: 960px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .stat-card {
    padding: 16px 12px 18px;
  }

  .page-about .stat-num {
    font-size: clamp(26px, 2.6vw, 34px);
  }

  .page-about .about-body {
    grid-template-columns: minmax(180px, 232px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .side-index {
    position: sticky;
    top: 92px;
    overflow: visible;
    padding: 16px 0 18px;
    border: 1px solid var(--line);
    border-top: 2px solid var(--cyan);
    background: rgba(11, 27, 51, 0.55);
    backdrop-filter: blur(6px);
  }

  .page-about .index-cap {
    padding: 0 14px;
  }

  .page-about .index-list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .index-link {
    border: 0;
    border-left: 2px solid transparent;
    padding: 9px 14px;
    font-size: 13px;
  }

  .page-about .index-link:hover,
  .page-about .index-link:focus-visible {
    border-left-color: var(--amber);
  }
}

@media (min-width: 1200px) {
  .page-about .hero-title {
    max-width: 20ch;
  }

  .page-about .chapter-body > p {
    font-size: 15.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stat-card,
  .page-about .index-link,
  .page-about .tl-item,
  .page-about .tl-item::before,
  .page-about .cta-link,
  .page-about .to-top {
    transition: none;
  }

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