.page-about {
  --abt-pad: clamp(20px, 4vw, 40px);
  --abt-gap: clamp(18px, 3vw, 32px);
  padding-bottom: clamp(56px, 8vw, 96px);
}

/* ---------- 首屏框景 ---------- */
.page-about .abt-hero {
  padding: clamp(24px, 5vw, 56px) 0 clamp(28px, 5vw, 52px);
}

.page-about .abt-hero-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  padding: var(--abt-pad);
  background:
    radial-gradient(120% 130% at 84% -12%, rgba(37, 244, 208, 0.16), transparent 62%),
    radial-gradient(90% 110% at 4% 108%, rgba(232, 184, 74, 0.1), transparent 58%),
    linear-gradient(158deg, rgba(11, 33, 26, 0.96), rgba(6, 19, 15, 0.99));
  box-shadow: var(--shadow-lift);
}

.page-about .abt-hero-frame::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px dashed rgba(155, 255, 233, 0.14);
  border-radius: calc(var(--radius-lg) - 9px);
  pointer-events: none;
}

.page-about .abt-hero-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(155, 255, 233, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(155, 255, 233, 0.07) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(90% 90% at 80% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(90% 90% at 80% 0%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-about .abt-hero-frame > * {
  position: relative;
  z-index: 1;
}

.page-about .abt-hero-frame .breadcrumb {
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .abt-hero-frame h1 {
  margin: 0;
  font-size: clamp(32px, 6.4vw, 68px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper-100);
  max-width: 17em;
}

.page-about .abt-hero-lede {
  margin: clamp(16px, 3vw, 26px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 2.2vw, 18px);
  line-height: 1.8;
  color: var(--slate-300);
}

.page-about .abt-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(22px, 4vw, 34px) 0 0;
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--line);
}

.page-about .abt-hero-facts > div {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(18, 54, 43, 0.5);
}

.page-about .abt-hero-facts dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate-300);
}

.page-about .abt-hero-facts dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(19px, 3.4vw, 26px);
  color: var(--cyan-400);
  letter-spacing: -0.01em;
}

/* ---------- 主栅格：索引 + 内容 ---------- */
.page-about .abt-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .abt-rail {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-deep);
  padding: 16px 16px 18px;
}

.page-about .abt-rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--slate-300);
}

.page-about .abt-rail .index-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 3px;
}

.page-about .abt-rail .index-link {
  display: flex;
  gap: 9px;
  align-items: baseline;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--slate-300);
  text-decoration: none;
  transition: color 200ms var(--ease), background 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .abt-rail .index-link .mono {
  font-size: 11px;
  color: var(--mint-200);
  opacity: 0.6;
}

.page-about .abt-rail .index-link:hover,
.page-about .abt-rail .index-link:focus-visible {
  color: var(--paper-100);
  background: rgba(37, 244, 208, 0.08);
  border-left-color: var(--cyan-400);
}

.page-about .abt-rail .index-link[aria-current="true"] {
  color: var(--paper-100);
  background: rgba(37, 244, 208, 0.12);
  border-left-color: var(--cyan-400);
}

.page-about .abt-rail-note {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-300);
}

.page-about .abt-rail-note p {
  margin: 0;
}

/* ---------- 章节骨架 ---------- */
.page-about .abt-sec {
  padding: clamp(30px, 5vw, 54px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .abt-sec .section-head {
  margin-bottom: clamp(20px, 3.5vw, 32px);
}

.page-about .abt-sec .section-head h2 {
  margin: 8px 0 0;
  font-size: clamp(24px, 4.4vw, 42px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper-100);
  max-width: 20em;
}

.page-about .abt-sec .lede {
  margin: 12px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate-300);
}

/* ---------- 01 起点与定位 ---------- */
.page-about .abt-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--abt-gap);
}

.page-about .abt-origin-text p {
  margin: 0 0 14px;
  font-size: clamp(15px, 2.1vw, 17px);
  line-height: 1.85;
  color: var(--paper-100);
  max-width: 68ch;
}

.page-about .abt-origin-text p:last-of-type {
  margin-bottom: 0;
}

.page-about .abt-points {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--line);
}

.page-about .abt-points li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 16px;
  background: var(--surface);
}

.page-about .abt-point-time {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold-500);
}

.page-about .abt-point-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate-300);
}

/* ---------- 图片块 ---------- */
.page-about .abt-shot {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--field-700);
  box-shadow: var(--shadow-lift);
}

.page-about .abt-shot img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .abt-shot .media-caption {
  display: block;
  padding: 10px 16px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--slate-300);
  border-top: 1px solid var(--line);
  background: var(--surface-deep);
}

/* ---------- 02 团队分工 ---------- */
.page-about .abt-team-bar {
  display: flex;
  width: 100%;
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface-deep);
  margin-bottom: 18px;
}

.page-about .abt-team-seg {
  display: block;
  height: 100%;
}

.page-about .abt-team-seg--a { background: var(--cyan-400); }
.page-about .abt-team-seg--b { background: var(--mint-200); }
.page-about .abt-team-seg--c { background: var(--gold-500); }
.page-about .abt-team-seg--d { background: var(--leaf-600); }

.page-about .abt-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .abt-team-card {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .abt-team-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .abt-team-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .abt-team-name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-100);
}

.page-about .abt-team-num {
  font-size: clamp(24px, 5vw, 34px);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan-400);
}

.page-about .abt-team-card p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate-300);
}

.page-about .abt-team-foot {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--abt-gap);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .abt-team-note {
  padding: 18px 20px;
  border-left: 2px solid var(--gold-500);
  border-radius: var(--radius-sm);
  background: rgba(18, 54, 43, 0.45);
}

.page-about .abt-team-note h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper-100);
}

.page-about .abt-team-note p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate-300);
}

.page-about .abt-team-note p:last-child {
  margin-bottom: 0;
}

/* ---------- 03 数据复核 ---------- */
.page-about .abt-sec--review {
  position: relative;
}

.page-about .abt-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .abt-flow-step {
  position: relative;
  padding: 18px 18px 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(150deg, rgba(18, 54, 43, 0.82), rgba(11, 33, 26, 0.92));
}

.page-about .abt-flow-step::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: 999px;
  background: linear-gradient(to bottom, var(--cyan-400), transparent);
}

.page-about .abt-flow-num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mint-200);
  opacity: 0.72;
}

.page-about .abt-flow-step h3 {
  margin: 8px 0 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper-100);
}

.page-about .abt-flow-step p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate-300);
}

.page-about .abt-quote {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 20px 22px;
  border: 1px solid rgba(232, 184, 74, 0.4);
  border-left-width: 3px;
  border-radius: var(--radius-md);
  background: rgba(232, 184, 74, 0.07);
}

.page-about .abt-quote p {
  margin: 0;
  font-size: clamp(16px, 2.4vw, 20px);
  line-height: 1.7;
  font-weight: 700;
  color: var(--gold-500);
}

.page-about .abt-quote cite {
  display: block;
  margin-top: 10px;
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-300);
}

.page-about .abt-sec--review .abt-shot--wide {
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 04 发展历程 ---------- */
.page-about .abt-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--line-strong);
  display: grid;
  gap: 18px;
}

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

.page-about .abt-tl-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 12px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(37, 244, 208, 0.14);
}

.page-about .abt-tl-node {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: 12px 16px;
  transition: border-color 200ms var(--ease);
}

.page-about .abt-tl-node[open] {
  border-color: var(--line-strong);
}

.page-about .abt-tl-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  padding: 2px 0;
}

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

.page-about .abt-tl-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .abt-tl-node[open] summary::after {
  content: "–";
}

.page-about .abt-tl-year {
  font-size: 15px;
  font-weight: 700;
  color: var(--gold-500);
  letter-spacing: 0.04em;
}

.page-about .abt-tl-head {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper-100);
}

.page-about .abt-tl-node p {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate-300);
}

/* ---------- 05 运营与服务 ---------- */
.page-about .abt-sec--ops {
  background: linear-gradient(180deg, rgba(18, 54, 43, 0.5), transparent 78%);
  border-radius: var(--radius-lg);
  padding-left: clamp(0px, 2vw, 24px);
  padding-right: clamp(0px, 2vw, 24px);
}

.page-about .abt-ops {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .abt-ops-card {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-deep);
}

.page-about .abt-ops-card--accent {
  border-color: rgba(37, 244, 208, 0.38);
  background: rgba(37, 244, 208, 0.08);
}

.page-about .abt-ops-key {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mint-200);
  opacity: 0.7;
}

.page-about .abt-ops-val {
  margin: 8px 0 0;
  font-size: clamp(17px, 2.8vw, 21px);
  font-weight: 700;
  color: var(--paper-100);
}

.page-about .abt-ops-desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate-300);
}

/* ---------- 06 合作价值 ---------- */
.page-about .abt-stat-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .abt-stat {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .abt-stat:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .abt-stat-num {
  display: block;
  font-size: clamp(26px, 6vw, 42px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan-400);
}

.page-about .abt-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gold-500);
}

.page-about .abt-stat p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate-300);
}

.page-about .abt-stat--lead {
  background: linear-gradient(150deg, rgba(37, 244, 208, 0.14), rgba(18, 54, 43, 0.8));
  border-color: rgba(37, 244, 208, 0.34);
}

.page-about .abt-stat--note {
  border-style: dashed;
  background: rgba(11, 33, 26, 0.72);
}

.page-about .abt-stat--note .btn {
  margin-top: 14px;
}

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

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

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

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

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

  .page-about .abt-stat--lead {
    grid-column: span 2;
  }

  .page-about .abt-points li {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .abt-origin-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .abt-team-foot {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

  .page-about .abt-stat--lead {
    grid-column: span 2;
    grid-row: span 1;
  }

  .page-about .abt-stat--note {
    grid-column: span 2;
  }
}

@media (min-width: 1024px) {
  .page-about .abt-shell {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .abt-rail {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }

  .page-about .abt-sec {
    padding: clamp(36px, 4vw, 60px) 0;
  }
}

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

  .page-about .abt-team-card:hover,
  .page-about .abt-stat:hover {
    transform: none;
  }
}
<<<END>>>