.page-about {
  background: var(--ink);
  color: var(--fog);
  --about-panel: rgba(16, 32, 58, 0.72);
  --about-rule: rgba(127, 227, 212, 0.22);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  background: var(--ink);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
  filter: saturate(0.7) contrast(1.05);
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(110% 80% at 84% 4%, rgba(127, 227, 212, 0.22), transparent 62%),
    linear-gradient(180deg, rgba(7, 21, 39, 0.72) 0%, rgba(7, 21, 39, 0.94) 56%, var(--ink) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-top: clamp(22px, 5vw, 46px);
  padding-bottom: clamp(44px, 8vw, 92px);
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  font-size: 12px;
  color: var(--slate);
}

.page-about .breadcrumbs li {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin: 0 8px;
  color: rgba(127, 227, 212, 0.42);
}

.page-about .breadcrumbs a {
  color: var(--mint);
  text-decoration: none;
  transition: color 180ms var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  max-width: 15ch;
  font-family: var(--font-display);
  font-size: clamp(34px, 7.4vw, 82px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .about-hero__title em {
  display: inline-block;
  font-style: normal;
  font-weight: 200;
  color: var(--mint);
  transform: skewX(-2deg);
}

.page-about .about-hero__lede {
  margin: 24px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(232, 238, 246, 0.82);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-hero__stats li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  padding: 14px 16px;
  background: rgba(7, 21, 39, 0.74);
}

.page-about .about-hero__stats .num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__stats .label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

/* ---------- 主体框架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  padding-top: clamp(34px, 5vw, 64px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .about-rail {
  border: 1px solid var(--line);
  background: rgba(11, 43, 38, 0.5);
  padding: 12px 14px 10px;
}

.page-about .about-rail__list {
  display: flex;
  gap: 4px;
  margin: 10px 0 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list li {
  flex: 0 0 auto;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 8px;
  font-size: 13px;
  color: var(--slate);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--fog);
  border-bottom-color: var(--lime);
}

.page-about .about-rail__list .num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(44px, 6vw, 76px);
  min-width: 0;
  counter-reset: about-sec;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  min-width: 0;
  counter-increment: about-sec;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section::before {
  content: counter(about-sec, decimal-leading-zero);
  position: absolute;
  top: -6px;
  right: 0;
  font-family: var(--font-mono);
  font-size: clamp(50px, 11vw, 94px);
  line-height: 0.85;
  font-weight: 500;
  color: transparent;
  -webkit-text-stroke: 1px rgba(198, 255, 62, 0.3);
  pointer-events: none;
  user-select: none;
}

.page-about .about-section__head {
  padding-top: 16px;
  border-top: 1px solid var(--line);
  margin-bottom: 20px;
}

.page-about .about-section__title {
  margin: 12px 0 0;
  padding-right: clamp(56px, 16vw, 132px);
  font-family: var(--font-display);
  font-size: clamp(23px, 3vw, 33px);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-section__lede {
  margin: 0 0 24px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .prose {
  max-width: 66ch;
}

.page-about .prose p {
  margin: 0 0 18px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(232, 238, 246, 0.86);
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

.page-about .prose strong {
  font-weight: 700;
  color: var(--fog);
  box-shadow: inset 0 -0.5em 0 rgba(198, 255, 62, 0.14);
}

/* ---------- 视觉取舍双栏 ---------- */
.page-about .about-two-col {
  display: grid;
  gap: 26px;
}

.page-about .about-notes {
  border: 1px solid var(--line);
  border-left: 2px solid var(--mint);
  background: rgba(25, 27, 58, 0.55);
  padding: 16px 18px 18px;
}

.page-about .about-notes__list {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-notes__list li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-notes__key {
  display: block;
  margin-bottom: 2px;
  font-size: 13px;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: 0.02em;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 28px;
}

.page-about .team-chart {
  border: 1px solid var(--line);
  background: var(--about-panel);
  padding: 16px 16px 8px;
}

.page-about .team-chart__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 14px;
  padding: 14px 10px 16px;
  border-bottom: 1px solid var(--grid-line);
  border-left: 2px solid transparent;
  transition: background-color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .team-chart__list .team-row:last-child {
  border-bottom: none;
}

.page-about .team-row:hover,
.page-about .team-row:focus-within {
  background: rgba(198, 255, 62, 0.05);
  border-left-color: var(--lime);
}

.page-about .team-row__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .team-row__count {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.page-about .team-row__track {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  background: rgba(127, 227, 212, 0.1);
  overflow: hidden;
}

.page-about .team-row__bar {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--mint), var(--lime));
  transition: filter 200ms var(--ease);
}

.page-about .team-row__bar--16 { width: 38%; }
.page-about .team-row__bar--12 { width: 29%; }
.page-about .team-row__bar--9  { width: 21%; }
.page-about .team-row__bar--5  { width: 12%; }

.page-about .team-row:hover .team-row__bar {
  filter: brightness(1.18);
}

.page-about .team-row__note {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px 12px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.65;
  color: var(--slate);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(198, 255, 62, 0.7), rgba(127, 227, 212, 0.28) 60%, rgba(127, 227, 212, 0));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 2px solid var(--lime);
  transform: rotate(45deg);
  transition: box-shadow 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(198, 255, 62, 0.16);
}

.page-about .timeline__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(232, 238, 246, 0.76);
}

.page-about .timeline__more {
  margin-top: 12px;
  border: 1px solid var(--line);
  background: rgba(11, 43, 38, 0.42);
}

.page-about .timeline__more summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 13px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mint);
  cursor: pointer;
  list-style: none;
}

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

.page-about .timeline__more summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--lime);
}

.page-about .timeline__more[open] summary::after {
  content: "−";
}

.page-about .timeline__more summary:hover {
  color: var(--lime);
}

.page-about .timeline__more p {
  margin: 0;
  padding: 0 13px 13px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-figure--timeline {
  margin-top: 28px;
}

/* ---------- 校验步骤 ---------- */
.page-about .verify-steps {
  display: grid;
  gap: 1px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .verify-step {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--about-panel);
  transition: background-color 200ms var(--ease);
}

.page-about .verify-step:hover {
  background: var(--panel-hover);
}

.page-about .verify-step__num {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .verify-step__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .verify-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .partner-card {
  padding: 18px 18px 20px;
  border: 1px solid var(--line);
  border-top: 2px solid rgba(198, 255, 62, 0.5);
  background: rgba(74, 22, 34, 0.28);
  transition: border-color 220ms var(--ease), background-color 220ms var(--ease);
}

.page-about .partner-card:hover {
  border-color: var(--lime);
  background: rgba(74, 22, 34, 0.42);
}

.page-about .partner-card h3 {
  margin: 10px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(232, 238, 246, 0.74);
}

/* ---------- 下一步 ---------- */
.page-about .about-cta {
  position: relative;
  background:
    linear-gradient(135deg, rgba(25, 27, 58, 0.96), rgba(11, 43, 38, 0.96)),
    var(--indigo);
  border-top: 1px solid var(--line-strong);
  padding-block: clamp(42px, 7vw, 84px);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--lime), rgba(127, 227, 212, 0.35) 46%, transparent);
}

.page-about .about-cta__head {
  max-width: 60ch;
}

.page-about .about-cta__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .about-cta__lede {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(232, 238, 246, 0.78);
}

.page-about .about-cta__links {
  display: grid;
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: rgba(127, 227, 212, 0.2);
  border: 1px solid rgba(127, 227, 212, 0.2);
}

.page-about .about-cta__link {
  display: grid;
  gap: 6px;
  padding: 18px 18px 20px;
  background: rgba(7, 21, 39, 0.82);
  text-decoration: none;
  transition: background-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  background: rgba(198, 255, 62, 0.08);
  box-shadow: inset 2px 0 0 var(--lime);
}

.page-about .about-cta__link strong {
  font-size: 17px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .about-cta__link > span:last-child {
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-cta__contact {
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid rgba(127, 227, 212, 0.24);
}

.page-about .about-cta__contact-line {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: var(--amber);
  word-break: break-word;
}

.page-about .about-cta__contact-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 断点 ---------- */
@media (min-width: 680px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

@media (min-width: 900px) {
  .page-about .about-two-col {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .timeline {
    padding-left: 34px;
  }

  .page-about .timeline::before {
    left: 8px;
  }

  .page-about .timeline__item::before {
    left: -34px;
    top: 7px;
    width: 11px;
    height: 11px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 186px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

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

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list a {
    border-bottom: none;
    border-left: 2px solid transparent;
    white-space: normal;
    padding: 8px 10px;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    border-left-color: var(--lime);
    border-bottom-color: transparent;
    background: rgba(198, 255, 62, 0.06);
  }

  .page-about .about-cta__links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .team-row,
  .page-about .team-row__bar,
  .page-about .timeline__item::before,
  .page-about .partner-card,
  .page-about .about-cta__link,
  .page-about .verify-step,
  .page-about .breadcrumbs a {
    transition-duration: 1ms;
  }
}
<<<END>>>