.page-about {
  font-family: 'Open Sans', '思源黑体', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--paper-50);
  color: var(--ink-700);
  overflow-x: hidden;
}

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

.page-about .page-about__hero {
  background: var(--ink-700);
  position: relative;
  overflow: hidden;
}

.page-about .page-about__hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--gold-400) 0%, var(--accent-500) 70%, var(--paper-50) 100%);
  z-index: 1;
}

.page-about .page-about__hero::after {
  content: '';
  position: absolute;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 26px;
  background: var(--accent-500);
  clip-path: polygon(0 100%, 100% 100%, 100% 0);
}

.page-about .page-about__hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-top: 64px;
  padding-bottom: 48px;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(253, 252, 248, 0.72);
  margin-bottom: 24px;
}

.page-about .breadcrumb a {
  color: var(--gold-400);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--accent-500);
}

.page-about .page-about__hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-400);
  margin-bottom: 12px;
}

.page-about .page-about__hero-kicker::before {
  content: '';
  display: inline-block;
  width: 28px;
  height: 4px;
  background: var(--accent-500);
}

.page-about .page-about__hero-title {
  font-family: 'Anton', 'Arial Black', '思源黑体', sans-serif;
  font-size: clamp(2.25rem, 6vw, 3.5rem);
  line-height: 1.05;
  color: var(--paper-50);
  margin: 0 0 20px;
  max-width: 12em;
}

.page-about .page-about__hero-lead {
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(253, 252, 248, 0.85);
  margin: 0 0 28px;
  max-width: 58ch;
}

.page-about .page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.page-about .page-about__hero-actions .btn-ghost {
  border-color: rgba(253, 252, 248, 0.7);
  color: var(--paper-50);
}

.page-about .page-about__hero-actions .btn-ghost:hover {
  background: rgba(253, 252, 248, 0.1);
  border-color: var(--paper-50);
}

.page-about .page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .page-about__hero-meta span {
  font-size: 12px;
  font-weight: 700;
  color: var(--gold-400);
  border: 1px solid rgba(255, 215, 0, 0.45);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
}

.page-about .page-about__hero-figure {
  margin: 0;
  border: 4px solid var(--paper-50);
  background: var(--paper-100);
  box-shadow: 10px 10px 0 rgba(6, 19, 39, 0.32);
}

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

.page-about .page-about__hero-caption {
  font-size: 12px;
  color: var(--ink-700);
  background: var(--paper-50);
  padding: 10px 14px;
}

.page-about .page-about__board {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding: 56px 0 80px;
}

.page-about .page-about__toc {
  background: var(--paper-100);
  border: 3px solid var(--ink-700);
  box-shadow: var(--shadow-offset);
  padding: 20px;
  position: static;
  align-self: start;
  z-index: 4;
}

.page-about .page-about__toc-title {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-700);
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--gold-400);
}

.page-about .page-about__toc-link {
  display: block;
  padding: 10px 14px;
  margin-bottom: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-700);
  text-decoration: none;
  border: 2px solid transparent;
  transition: all 0.2s ease;
}

.page-about .page-about__toc-link:hover,
.page-about .page-about__toc-link:focus {
  border-color: var(--accent-500);
  background: var(--paper-50);
}

.page-about .page-about__section {
  border-top: 5px solid var(--ink-700);
  padding-top: 36px;
  margin-bottom: 72px;
  scroll-margin-top: 110px;
}

.page-about .page-about__section-head {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 30px;
}

.page-about .page-about__section-num {
  font-family: 'Anton', 'Arial Narrow', '思源黑体', sans-serif;
  font-size: 3rem;
  line-height: 1;
  color: var(--accent-500);
}

.page-about .page-about__section-titles h2 {
  font-family: 'Anton', 'Arial Black', '思源黑体', sans-serif;
  font-size: 1.75rem;
  line-height: 1.1;
  margin: 0 0 6px;
  color: var(--ink-700);
}

.page-about .page-about__section-titles p {
  font-size: 14px;
  color: var(--steel-400);
  margin: 0;
}

.page-about .page-about__who-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .page-about__who-copy p {
  font-size: 15px;
  line-height: 1.85;
  margin: 0 0 16px;
}

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

.page-about .page-about__who-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .page-about__stat-card {
  background: var(--ink-700);
  border: 2px solid var(--ink-700);
  padding: 24px 12px;
  text-align: center;
  box-shadow: var(--shadow-offset);
}

.page-about .page-about__stat-num {
  display: block;
  font-family: 'Anton', 'Arial Narrow', '思源黑体', sans-serif;
  font-size: 2rem;
  line-height: 1;
  color: var(--gold-400);
}

.page-about .page-about__stat-label {
  display: block;
  font-size: 12px;
  color: rgba(253, 252, 248, 0.72);
  margin-top: 8px;
}

.page-about .page-about__timeline {
  position: relative;
  margin: 0;
  padding-left: 36px;
}

.page-about .page-about__timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: var(--ink-700);
}

.page-about .page-about__milestone {
  position: relative;
  margin-bottom: 30px;
}

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

.page-about .page-about__milestone-dot {
  position: absolute;
  left: -34px;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--gold-400);
  border: 3px solid var(--ink-700);
  box-shadow: 0 0 0 4px var(--paper-50);
}

.page-about .page-about__milestone-card {
  background: var(--paper-100);
  border: 2px solid var(--ink-700);
  padding: 20px 24px;
  box-shadow: var(--shadow-offset);
}

.page-about .page-about__milestone-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--accent-500);
  color: var(--paper-50);
  padding: 4px 10px;
  margin-bottom: 12px;
}

.page-about .page-about__milestone-card h3 {
  font-family: 'Anton', 'Arial Black', '思源黑体', sans-serif;
  font-size: 1.25rem;
  margin: 0 0 8px;
  color: var(--ink-700);
}

.page-about .page-about__milestone-card p {
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
  color: var(--ink-700);
}

.page-about .page-about__details {
  margin-top: 36px;
  border: 2px dashed var(--steel-400);
  background: var(--paper-50);
  padding: 16px 20px;
}

.page-about .page-about__details summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 800;
  color: var(--ink-700);
}

.page-about .page-about__details p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.75;
}

.page-about .page-about__timeline-bg {
  margin: 32px auto 0;
  max-width: 200px;
  opacity: 0.55;
}

.page-about .page-about__data-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .page-about__data-figure {
  margin: 0;
  border: 3px solid var(--ink-700);
  background: var(--paper-100);
  box-shadow: var(--shadow-offset);
}

.page-about .page-about__data-figure img {
  width: 100%;
  height: auto;
}

.page-about .page-about__data-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .page-about__data-item {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  border: 2px solid var(--ink-700);
  background: var(--paper-50);
  padding: 20px;
}

.page-about .page-about__data-num {
  font-family: 'Anton', 'Arial Narrow', sans-serif;
  font-size: 2rem;
  line-height: 1;
  color: var(--accent-500);
  min-width: 40px;
}

.page-about .page-about__data-item h3 {
  font-size: 1.1rem;
  margin: 0 0 6px;
  color: var(--ink-700);
}

.page-about .page-about__data-item p {
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
}

.page-about .page-about__team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .page-about__team-card {
  background: var(--paper-50);
  border: 3px solid var(--ink-700);
  padding: 24px;
  box-shadow: var(--shadow-offset);
}

.page-about .page-about__team-card--primary {
  background: var(--ink-700);
  color: var(--paper-50);
}

.page-about .page-about__team-label {
  display: block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-500);
  margin-bottom: 8px;
}

.page-about .page-about__team-card h3 {
  font-family: 'Anton', 'Arial Black', '思源黑体', sans-serif;
  font-size: 1.3rem;
  margin: 0 0 10px;
  color: var(--ink-700);
}

.page-about .page-about__team-card p {
  font-size: 14px;
  line-height: 1.8;
  margin: 0;
}

.page-about .page-about__team-card--primary h3 {
  color: var(--paper-50);
}

.page-about .page-about__team-card--primary p {
  color: rgba(253, 252, 248, 0.82);
}

.page-about .page-about__team-card--primary .page-about__team-label {
  color: var(--gold-400);
}

.page-about .page-about__more {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 48px;
  padding: 24px;
  background: var(--paper-100);
  border-top: 3px solid var(--ink-700);
  border-bottom: 3px solid var(--ink-700);
}

.page-about .page-about__more-label {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-700);
  margin-right: 6px;
}

.page-about .page-about__more a {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-700);
  text-decoration: none;
  border: 2px solid var(--ink-700);
  padding: 6px 14px;
  transition: all 0.2s ease;
}

.page-about .page-about__more a:hover {
  background: var(--accent-500);
  border-color: var(--accent-500);
  color: var(--paper-50);
}

@media (min-width: 1024px) {
  .page-about .page-about__hero-inner {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 56px;
    padding-top: 88px;
    padding-bottom: 72px;
  }

  .page-about .page-about__hero-title {
    font-size: 4rem;
    margin-bottom: 24px;
  }

  .page-about .page-about__hero-lead {
    font-size: 1.125rem;
  }

  .page-about .page-about__board {
    grid-template-columns: 260px 1fr;
    gap: 56px;
    align-items: start;
    padding: 72px 0 100px;
  }

  .page-about .page-about__toc {
    position: sticky;
    top: 100px;
  }

  .page-about .page-about__who-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
  }

  .page-about .page-about__who-stats {
    grid-template-columns: 1fr;
    align-content: start;
  }

  .page-about .page-about__stat-card {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    text-align: left;
    padding: 16px 20px;
  }

  .page-about .page-about__stat-num {
    font-size: 2rem;
  }

  .page-about .page-about__stat-label {
    margin: 0;
  }

  .page-about .page-about__data-block {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
  }

  .page-about .page-about__team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .page-about .page-about__section-num {
    font-size: 4rem;
  }

  .page-about .page-about__section-titles h2 {
    font-size: 2.25rem;
  }
}