.page-about {
  --about-rail: 316px;
  background:
    radial-gradient(1000px 520px at 88% -8%, rgba(22, 217, 227, .10), transparent 62%),
    radial-gradient(760px 420px at 2% 26%, rgba(255, 107, 74, .07), transparent 60%),
    var(--c-navy);
  color: var(--c-paper);
  font-family: var(--font-body);
}

.page-about .about-shell {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  padding-top: clamp(20px, 3.4vw, 40px);
  padding-bottom: clamp(40px, 7vw, 88px);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 16px;
  margin-top: clamp(14px, 2.4vw, 26px);
}

.page-about .about-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-cyan);
}

.page-about .about-eyebrow::before {
  content: "";
  display: block;
  width: 34px;
  height: 1px;
  background: var(--c-cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(30px, 5.6vw, 56px);
  line-height: 1.12;
  letter-spacing: -.01em;
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--c-cyan);
}

.page-about .about-lead {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.4vw, 17.5px);
  line-height: 1.95;
  color: #D3E1EC;
}

.page-about .hero-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 0;
  padding: 0;
}

.page-about .hero-chip {
  padding: 6px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-mist);
  background: rgba(11, 59, 94, .55);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about .about-hero-figure {
  margin: 6px 0 0;
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

/* ---------- 右侧坐标栏 ---------- */
.page-about .about-rail {
  display: grid;
  align-content: start;
  gap: 14px;
  min-width: 0;
}

.page-about .rail-card {
  padding: 18px 18px 16px;
  background: linear-gradient(150deg, rgba(11, 59, 94, .95), rgba(4, 18, 31, .92));
  border: 1px solid var(--line);
  border-top: 2px solid var(--c-cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .rail-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--c-mist);
}

.page-about .rail-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 12px 0 0;
}

.page-about .rail-figure {
  padding: 10px 10px 9px;
  background: rgba(7, 42, 69, .62);
  border: 1px solid var(--line-soft);
}

.page-about .rail-figure dt {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--c-mist);
}

.page-about .rail-figure dd {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 23px;
  line-height: 1.1;
  color: var(--c-sand);
}

.page-about .rail-figure dd small {
  margin-left: 3px;
  font-size: 11.5px;
  font-weight: 400;
  color: var(--c-mist);
}

.page-about .rail-note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .rail-index {
  padding: 14px 14px 10px;
  background: rgba(7, 42, 69, .5);
  border: 1px solid var(--line);
}

.page-about .rail-index-list {
  list-style: none;
  display: grid;
  gap: 2px;
  margin: 10px 0 0;
  padding: 0;
}

.page-about .rail-index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 6px;
  font-size: 14px;
  color: #CBD8E4;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .rail-index-link span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-cyan);
}

.page-about .rail-index-link:hover,
.page-about .rail-index-link:focus-visible {
  color: #FFFFFF;
  border-left-color: var(--c-coral);
  background: rgba(22, 217, 227, .08);
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  margin-top: clamp(38px, 5.6vw, 70px);
}

.page-about .sec-head {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .sec-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--c-sand);
}

.page-about .sec-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.26;
}

.page-about .sec-title::after {
  content: "";
  display: block;
  width: 54px;
  height: 2px;
  margin-top: 12px;
  background: linear-gradient(90deg, var(--c-coral), var(--c-cyan));
}

.page-about .body-text {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.95;
  color: #C5D5E2;
}

.page-about .body-text:last-of-type {
  margin-bottom: 0;
}

.page-about .about-figure {
  margin: 22px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: rgba(4, 18, 31, .6);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .figure-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--c-mist);
  padding-left: 12px;
  border-left: 2px solid var(--c-navy-3);
}

/* ---------- 纵向时间轴 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 4px 0 0 44px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom, var(--edge-strong), rgba(169, 183, 198, .1));
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 19px;
  width: 11px;
  height: 11px;
  transform: rotate(45deg);
  background: var(--c-navy-2);
  border: 1px solid var(--c-cyan);
}

.page-about .tl-details {
  background: linear-gradient(135deg, rgba(11, 59, 94, .85), rgba(7, 42, 69, .55));
  border: 1px solid var(--line);
  border-left: 2px solid transparent;
  transition: border-color .22s var(--ease), background .22s var(--ease);
}

.page-about .tl-details[open],
.page-about .tl-details:hover {
  border-left-color: var(--c-coral);
  background: linear-gradient(135deg, rgba(18, 74, 114, .9), rgba(7, 42, 69, .7));
}

.page-about .tl-summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .tl-details[open] .tl-summary::after {
  content: "–";
  color: var(--c-coral);
}

.page-about .tl-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--c-cyan);
}

.page-about .tl-title {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: #EAF3F8;
}

.page-about .tl-stage {
  padding: 2px 8px;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-sand);
  border: 1px solid rgba(232, 195, 122, .4);
  background: rgba(232, 195, 122, .08);
}

.page-about .tl-body {
  padding: 0 16px 15px 39px;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: #BECEDB;
}

/* ---------- 维护分工 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 12px;
  margin-top: 4px;
}

.page-about .team-card {
  padding: 16px 16px 18px;
  background: linear-gradient(160deg, rgba(18, 74, 114, .55), rgba(7, 42, 69, .78));
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .team-card:hover {
  border-color: var(--edge-strong);
  transform: translateY(-2px);
}

.page-about .team-code {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-cyan);
}

.page-about .team-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  color: #EAF3F8;
}

.page-about .team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: #BECEDB;
}

.page-about .team-card strong {
  font-family: var(--font-mono);
  color: var(--c-sand);
}

/* ---------- 服务原则 ---------- */
.page-about .principles {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-about .principle {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0 14px;
  padding: 18px 16px;
  background: rgba(4, 18, 31, .55);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--c-navy-3);
  transition: border-color .24s var(--ease), background .24s var(--ease);
}

.page-about .principle:hover,
.page-about .principle:focus-within {
  border-left-color: var(--c-coral);
  background: rgba(11, 59, 94, .7);
}

.page-about .principle-num {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  color: var(--c-sand);
}

.page-about .principle h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  color: #EAF3F8;
}

.page-about .principle p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: #BCCCD9;
}

/* ---------- 运营节奏 ---------- */
.page-about .data-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .data-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .data-label {
  font-size: 14.5px;
  color: #CEDCE8;
}

.page-about .data-value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-cyan);
  text-align: right;
  white-space: nowrap;
}

.page-about .data-note {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  margin-top: clamp(40px, 6vw, 72px);
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--line);
}

.page-about .next-grid {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.page-about .next-link {
  display: grid;
  gap: 3px;
  padding: 14px 16px;
  color: inherit;
  text-decoration: none;
  background: linear-gradient(120deg, rgba(11, 59, 94, .62), rgba(7, 42, 69, .32));
  border: 1px solid var(--line);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-color: var(--edge-strong);
  transform: translateX(3px);
}

.page-about .next-link em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-cyan);
}

.page-about .next-link strong {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: #EAF3F8;
}

.page-about .next-link span {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--c-mist);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .team-grid,
  .page-about .principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .tl-body {
    padding-left: 39px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: minmax(0, 1fr) var(--about-rail);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }

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

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

  .page-about .team-card:hover,
  .page-about .next-link:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>