.page-about {
  --about-gap: clamp(20px, 3vw, 40px);
  --about-line: rgba(143, 166, 184, 0.24);
  --about-line-2: rgba(143, 166, 184, 0.5);
  --about-soft: #b9cbd9;
  background: var(--ink);
  color: var(--fog);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about .about-hero {
  padding-block: clamp(18px, 3vw, 32px) clamp(40px, 7vw, 92px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(24px, 4vw, 44px);
}

.page-about .about-hero-rail {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.page-about .about-rail-line {
  display: block;
  width: 44px;
  height: 2px;
  background: linear-gradient(90deg, var(--mint), transparent);
  flex: none;
}

.page-about .about-rail-text {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--mint);
  white-space: nowrap;
}

.page-about .about-rail-index {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--blue-gray);
}

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

.page-about .about-title {
  margin: 14px 0 20px;
  font-size: clamp(36px, 7.2vw, 80px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--fog);
  max-width: 18ch;
}

.page-about .about-figure {
  color: var(--mint);
  font-size: inherit;
  letter-spacing: 0;
}

.page-about .about-lede {
  max-width: 62ch;
  color: var(--about-soft);
  font-size: 16px;
  line-height: 1.78;
  margin: 0 0 clamp(22px, 3vw, 30px);
}

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

.page-about .about-section {
  padding-block: clamp(44px, 7vw, 96px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-section--last {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
}

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

.page-about .about-side .eyebrow {
  color: var(--mint);
  margin: 0 0 14px;
}

.page-about .about-side .section-title {
  margin: 0 0 14px;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--fog);
  max-width: 18ch;
}

.page-about .about-side-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--blue-gray);
  max-width: 34ch;
}

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

.page-about .about-lead-text {
  margin: 0 0 clamp(24px, 3vw, 36px);
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-soft);
  max-width: 68ch;
}

/* ---------- 认证徽章 ---------- */
.page-about .cert-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 32px);
  align-items: start;
}

.page-about .cert-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.page-about .cert {
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .cert:hover,
.page-about .cert[open] {
  border-color: rgba(46, 242, 194, 0.55);
}

.page-about .cert[open] {
  background: #0B1A2E;
  box-shadow: 6px 6px 0 rgba(46, 242, 194, 0.08);
}

.page-about .cert-summary {
  display: grid;
  grid-template-columns: 30px auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .cert-hex {
  width: 26px;
  height: 30px;
  color: var(--steel);
  transition: color var(--dur) var(--ease);
}

.page-about .cert:hover .cert-hex,
.page-about .cert[open] .cert-hex {
  color: var(--mint);
}

.page-about .cert-index {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--blue-gray);
}

.page-about .cert-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--fog);
  letter-spacing: 0.01em;
}

.page-about .cert-stars {
  font-size: 9px;
  letter-spacing: 0.22em;
  color: var(--amber);
}

.page-about .cert-body {
  padding: 0 16px 16px 58px;
}

.page-about .cert-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-soft);
}

.page-about .about-media {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
}

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

.page-about .media-frame-caption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--blue-gray);
  border-top: 1px solid var(--about-line);
}

/* ---------- 团队矩阵 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: clamp(24px, 3vw, 36px);
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px 24px;
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--steel);
  transition: border-left-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

.page-about .team-num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .team-title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .team-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-soft);
}

.page-about .team-card--b { border-left-color: var(--mint); }
.page-about .team-card--b .team-num { color: var(--mint); }

/* ---------- 版本时间轴 ---------- */
.page-about .about-wide { min-width: 0; }

.page-about .about-wide-head {
  margin-bottom: clamp(28px, 4vw, 48px);
  max-width: 60ch;
}

.page-about .about-wide-head .eyebrow {
  color: var(--mint);
  margin: 0 0 14px;
}

.page-about .about-wide-head .section-title {
  margin: 0 0 14px;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-wide-head .about-side-note { max-width: 52ch; }

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 18px;
  width: 3px;
  background: linear-gradient(180deg, var(--amber) 0%, var(--steel) 45%, rgba(27, 53, 82, 0.3) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-left: 40px;
  padding-bottom: 26px;
}

.page-about .tl-item:last-child { padding-bottom: 0; }

.page-about .tl-node {
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(245, 180, 74, 0.14);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-node,
.page-about .tl-item:focus-within .tl-node {
  background: var(--mint);
  box-shadow: 0 0 0 5px rgba(46, 242, 194, 0.18);
}

.page-about .tl-card {
  padding: 16px 18px 18px;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-card,
.page-about .tl-item:focus-within .tl-card {
  border-color: rgba(46, 242, 194, 0.4);
  background: #0B1A2E;
}

.page-about .tl-index {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .tl-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-soft);
  max-width: 62ch;
}

.page-about .tl-extra {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--about-line-2);
  font-size: 13px;
  line-height: 1.72;
  color: var(--blue-gray);
  max-width: 62ch;
}

/* ---------- 覆盖网络 ---------- */
.page-about .net-wrap {
  border: 1px solid var(--about-line);
  background:
    radial-gradient(circle at 30% 30%, rgba(46, 242, 194, 0.07), transparent 60%),
    var(--ink-2);
  padding: 12px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .net {
  position: relative;
  height: clamp(240px, 38vw, 340px);
  width: 100%;
}

.page-about .net::before {
  content: "";
  position: absolute;
  inset: 8% 6%;
  border: 1px dashed rgba(143, 166, 184, 0.25);
}

.page-about .net-node {
  position: absolute;
  left: var(--x);
  top: var(--y);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(46, 242, 194, 0.14);
  transform: translate(-50%, -50%);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .net-node:nth-child(3n) {
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(245, 180, 74, 0.16);
}

.page-about .net-node::after {
  content: attr(data-label);
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%) translateY(4px);
  padding: 3px 8px;
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--mint-soft);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .net-node:hover {
  background: var(--mint-soft);
  box-shadow: 0 0 0 6px rgba(46, 242, 194, 0.2);
}

.page-about .net-node:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.page-about .net-caption {
  margin: 0;
  padding: 4px 2px 0;
  color: var(--blue-gray);
}

/* ---------- 服务承诺 ---------- */
.page-about .promise-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--about-line);
}

.page-about .promise-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding-block: clamp(18px, 2.6vw, 26px);
  border-bottom: 1px solid var(--about-line);
  transition: background-color var(--dur) var(--ease);
}

.page-about .promise-row:hover { background: rgba(14, 32, 56, 0.6); }

.page-about .promise-key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .promise-val h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .promise-val p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-soft);
  max-width: 62ch;
}

.page-about .about-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: clamp(28px, 4vw, 40px);
}

.page-about .about-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border: 1px solid var(--about-line);
  background: var(--ink-2);
  color: var(--fog);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

.page-about .about-link-arrow {
  color: var(--mint);
  font-family: var(--font-mono);
}

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

  .page-about .team-card--c { grid-column: 1 / -1; }

  .page-about .promise-row {
    grid-template-columns: minmax(160px, 220px) minmax(0, 1fr);
    gap: clamp(18px, 3vw, 40px);
    align-items: start;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-hero-rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    padding-right: 18px;
    border-right: 1px solid var(--about-line);
  }

  .page-about .about-rail-line {
    width: 2px;
    height: 56px;
    background: linear-gradient(180deg, var(--mint), transparent);
  }

  .page-about .about-rail-text {
    writing-mode: vertical-rl;
    letter-spacing: 0.34em;
  }

  .page-about .about-split {
    grid-template-columns: minmax(190px, 260px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 76px);
  }

  .page-about .about-side {
    position: sticky;
    top: 32px;
    align-self: start;
  }

  .page-about .cert-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
    gap: clamp(24px, 3vw, 36px);
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .team-card--c { grid-column: auto; }

  .page-about .team-card--a { margin-top: 0; }
  .page-about .team-card--b { margin-top: 26px; }
  .page-about .team-card--c { margin-top: 52px; }

  .page-about .about-wide-head {
    max-width: 58ch;
  }

  .page-about .tl-item { padding-left: 52px; }
}

@media (min-width: 1200px) {
  .page-about .about-hero-grid {
    grid-template-columns: 108px minmax(0, 1fr);
  }
}

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

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

.page-about {
  --x: var(--max);
  --y: inherit;
}