.page-about {
  --about-radius: 26px;
  position: relative;
  color: var(--mist);
  background:
    radial-gradient(70% 50% at 8% 0%, rgba(139, 92, 246, 0.16), transparent 68%),
    radial-gradient(55% 45% at 96% 12%, rgba(94, 234, 212, 0.08), transparent 70%),
    var(--deep-space);
}

.page-about .container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .section {
  padding-block: clamp(2.75rem, 6vw, 5rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(1rem, 3vw, 2rem) clamp(2.5rem, 6vw, 4.5rem);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset-inline: -20%;
  top: -30%;
  height: 70%;
  background: radial-gradient(closest-side, rgba(139, 92, 246, 0.22), transparent);
  pointer-events: none;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--silver);
  opacity: 0.8;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-inline: 0.35rem;
  color: var(--line);
}

.page-about .breadcrumb a {
  color: var(--violet-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--silver);
  border-bottom-color: var(--violet);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
  margin-top: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .about-hero__lead h1 {
  margin: 0.65rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 7vw, 5rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--silver);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 52ch;
  margin: 1.25rem 0 0;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .about-hero__board {
  position: relative;
  padding: 1.5rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(165deg, rgba(17, 26, 51, 0.96), rgba(14, 22, 48, 0.82));
  box-shadow: inset 0 1px 0 rgba(215, 222, 234, 0.06), 0 24px 60px -40px rgba(139, 92, 246, 0.7);
  overflow: hidden;
}

.page-about .board-orbit {
  position: absolute;
  top: -70px;
  right: -60px;
  width: 200px;
  height: 200px;
  border: 1px solid rgba(139, 92, 246, 0.35);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .board-orbit::before {
  content: "";
  position: absolute;
  inset: 28px;
  border: 1px dashed rgba(94, 234, 212, 0.22);
  border-radius: 50%;
}

.page-about .board-list {
  position: relative;
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
}

.page-about .board-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px dashed rgba(37, 50, 77, 0.9);
}

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

.page-about .board-item dt {
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  color: var(--silver);
  opacity: 0.82;
}

.page-about .board-item dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
}

.page-about .board-num {
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  font-weight: 600;
  color: var(--silver);
  line-height: 1;
}

.page-about .board-unit {
  font-size: 0.8125rem;
  color: var(--violet-soft);
}

.page-about .board-foot {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1.35rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid rgba(37, 50, 77, 0.85);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--silver);
  opacity: 0.78;
}

/* ---------- 品牌起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: 2rem;
}

.page-about .origin-copy h2 {
  margin: 0.6rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.65rem, 3.6vw, 2.6rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--silver);
  text-wrap: balance;
}

.page-about .origin-copy p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
  opacity: 0.9;
}

.page-about .origin-points {
  display: grid;
  gap: 0.9rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .origin-point {
  position: relative;
  padding: 1.15rem 1.25rem 1.15rem 3.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(17, 26, 51, 0.72);
}

.page-about .origin-index {
  position: absolute;
  left: 1.1rem;
  top: 1.25rem;
  font-size: 0.8125rem;
  color: var(--violet-soft);
}

.page-about .origin-point h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--silver);
}

.page-about .origin-point p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
  opacity: 0.82;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: linear-gradient(180deg, transparent, rgba(14, 22, 48, 0.85) 14%, rgba(14, 22, 48, 0.85) 86%, transparent);
}

.page-about .section-head h2 {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.8vw, 2.9rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--silver);
  text-wrap: balance;
}

.page-about .section-lede {
  max-width: 60ch;
  margin: 0.9rem 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
  opacity: 0.85;
}

.page-about .timeline-figure {
  margin: 1.75rem 0 2.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--nebula);
}

.page-about .timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .tl {
  position: relative;
  display: grid;
  gap: 1.5rem;
  margin: 0;
  padding: 0 0 0 2.5rem;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--violet), rgba(94, 234, 212, 0.45), rgba(139, 92, 246, 0.12));
}

.page-about .tl-item {
  position: relative;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(17, 26, 51, 0.7);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -2.5rem;
  top: 1.35rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--pod);
  border: 2px solid var(--violet);
  box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.14);
}

.page-about .tl-item:hover,
.page-about .tl-item:focus-within {
  border-color: rgba(139, 92, 246, 0.55);
  box-shadow: 0 0 0 1px rgba(139, 92, 246, 0.22), 0 20px 44px -32px rgba(139, 92, 246, 0.9);
  transform: translateY(-2px);
}

.page-about .tl-stage {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.6rem;
}

.page-about .tl-tag {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--mint);
  opacity: 0.85;
}

.page-about .tl-item h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--silver);
}

.page-about .tl-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
  opacity: 0.84;
}

/* ---------- 团队构成 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1.75rem;
  margin-top: 1.75rem;
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--nebula);
}

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

.page-about .team-figure figcaption,
.page-about .eco-figure figcaption {
  padding: 0.85rem 1.15rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--silver);
  opacity: 0.72;
  border-top: 1px solid var(--line);
}

.page-about .team-cards {
  display: grid;
  gap: 0.9rem;
}

.page-about .team-card {
  padding: 1.2rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(17, 26, 51, 0.78);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: rgba(94, 234, 212, 0.5);
  box-shadow: 0 18px 40px -32px rgba(94, 234, 212, 0.85);
  transform: translateY(-2px);
}

.page-about .team-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.page-about .team-card__head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--silver);
}

.page-about .team-count {
  font-size: 0.875rem;
  color: var(--amber);
  letter-spacing: 0.04em;
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--mist);
  opacity: 0.85;
}

.page-about .team-card__more {
  margin-top: 0.55rem;
  padding-top: 0.55rem;
  border-top: 1px dashed rgba(37, 50, 77, 0.9);
  font-size: 0.875rem;
  opacity: 0.72;
}

/* ---------- 五项标准 ---------- */
.page-about .about-standard {
  background: linear-gradient(180deg, transparent, rgba(7, 11, 26, 0.9));
}

.page-about .std-list {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .std-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(17, 26, 51, 0.7);
  overflow: hidden;
  transition: border-color 0.25s ease, background-color 0.25s ease;
}

.page-about .std-item:has(.std-trigger[aria-expanded="true"]) {
  border-color: rgba(139, 92, 246, 0.55);
  background: rgba(20, 30, 58, 0.92);
}

.page-about .std-trigger {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  width: 100%;
  padding: 1.05rem 1.15rem;
  border: 0;
  background: transparent;
  color: var(--silver);
  text-align: left;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.2s ease;
}

.page-about .std-trigger:hover {
  color: var(--violet-soft);
}

.page-about .std-trigger:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: -3px;
}

.page-about .std-index {
  font-size: 0.8125rem;
  color: var(--violet-soft);
  letter-spacing: 0.08em;
}

.page-about .std-title {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .std-hint {
  position: relative;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border: 1px solid rgba(139, 92, 246, 0.6);
  border-radius: 50%;
}

.page-about .std-hint::before,
.page-about .std-hint::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 1.5px;
  background: var(--violet-soft);
  transform: translate(-50%, -50%);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.page-about .std-hint::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.page-about .std-trigger[aria-expanded="true"] .std-hint::after {
  transform: translate(-50%, -50%) rotate(0deg);
  opacity: 0;
}

.page-about .std-panel {
  padding: 0 1.15rem 1.15rem 3.05rem;
  display: block;
}

.page-about .std-panel p {
  margin: 0 0 0.7rem;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
  opacity: 0.86;
}

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

/* ---------- 覆盖与生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 1.75rem;
  align-items: start;
}

.page-about .eco-copy h2 {
  margin: 0.6rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.65rem, 3.6vw, 2.6rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--silver);
  text-wrap: balance;
}

.page-about .eco-copy > p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
  opacity: 0.88;
}

.page-about .badge-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1.35rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .badge {
  padding: 0.45rem 0.9rem;
  border: 1px solid rgba(139, 92, 246, 0.45);
  border-radius: var(--radius-pill);
  background: rgba(139, 92, 246, 0.12);
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--violet-soft);
}

.page-about .badge:nth-child(even) {
  border-color: rgba(94, 234, 212, 0.4);
  background: rgba(94, 234, 212, 0.1);
  color: var(--mint);
}

.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .coverage-stats li {
  padding: 0.95rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(14, 22, 48, 0.8);
}

.page-about .coverage-num {
  display: block;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--amber);
  line-height: 1.1;
}

.page-about .coverage-label {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--silver);
  opacity: 0.78;
}

.page-about .eco-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--nebula);
}

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

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.page-about .next-shell {
  padding: clamp(1.5rem, 4vw, 2.75rem);
  border: 1px solid rgba(139, 92, 246, 0.35);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(80% 120% at 100% 0%, rgba(139, 92, 246, 0.2), transparent 65%),
    linear-gradient(160deg, rgba(17, 26, 51, 0.96), rgba(14, 22, 48, 0.86));
}

.page-about .next-copy h2 {
  margin: 0.55rem 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--silver);
  text-wrap: balance;
}

.page-about .next-copy p {
  max-width: 62ch;
  margin: 0;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--mist);
  opacity: 0.86;
}

.page-about .next-links {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.page-about .next-link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.95rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(7, 11, 26, 0.55);
  text-decoration: none;
  transition: border-color 0.22s ease, background-color 0.22s ease, transform 0.22s ease;
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  border-color: var(--violet);
  background: rgba(139, 92, 246, 0.12);
  transform: translateY(-2px);
}

.page-about .next-link__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--silver);
}

.page-about .next-link__desc {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--mist);
  opacity: 0.72;
}

.page-about .next-link--accent {
  border-color: rgba(94, 234, 212, 0.45);
  background: rgba(94, 234, 212, 0.08);
}

.page-about .next-link--accent:hover,
.page-about .next-link--accent:focus-visible {
  border-color: var(--mint);
  background: rgba(94, 234, 212, 0.16);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .team-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.85fr);
    align-items: end;
    gap: 2.5rem;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 2rem;
    align-items: start;
  }

  .page-about .team-figure {
    position: sticky;
    top: 2rem;
  }

  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 2.5rem;
    align-items: center;
  }

  .page-about .tl {
    padding-left: 3rem;
    gap: 1.5rem;
  }

  .page-about .tl-item::before {
    left: -3rem;
  }

  .page-about .tl::before {
    left: 6px;
  }

  .page-about .std-trigger {
    padding: 1.15rem 1.5rem;
    font-size: 1.0625rem;
  }

  .page-about .std-panel {
    padding: 0 1.5rem 1.35rem 3.6rem;
  }
}

@media (min-width: 1180px) {
  .page-about .next-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item,
  .page-about .team-card,
  .page-about .next-link,
  .page-about .std-hint::before,
  .page-about .std-hint::after {
    transition: none !important;
  }

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