.page-about {
  --about-ink: #0A1128;
  --about-ink-1: #16264D;
  --about-ink-2: #1E3A6E;
  --about-orange: #FF7A00;
  --about-neon: #39FF88;
  --about-paper: #FFFFFF;
  --about-warm: #F3F4F6;
  --about-radius: 24px;
  --about-shadow: 0 12px 40px rgba(10, 17, 40, 0.12);

  background: var(--about-warm);
  color: var(--about-ink);
  overflow-x: clip;
}

.page-about__hero-wrap {
  position: relative;
  background:
    radial-gradient(circle at 88% 20%, rgba(255, 122, 0, 0.22) 0%, transparent 260px),
    radial-gradient(circle at 30% 90%, rgba(57, 255, 136, 0.1) 0%, transparent 220px),
    linear-gradient(160deg, var(--about-ink) 0%, var(--about-ink-1) 55%, var(--about-ink-2) 100%);
  color: #fff;
  padding: 32px 0 104px;
  border-radius: 0 0 48px 48px;
}

.page-about__hero-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.page-about .breadcrumb {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 48px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .breadcrumb a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  transition: color var(--duration) var(--ease);
}

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

.page-about .breadcrumb__separator {
  color: var(--about-orange);
  opacity: 0.7;
}

.page-about__hero {
  display: grid;
  gap: 36px;
  align-items: end;
}

.page-about__eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--about-neon);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.page-about .page-hero__display {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0;
}

.page-about__hero-sub {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  color: #fff;
  margin-top: 14px;
  opacity: 0.88;
}

.page-about .page-hero__description {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.74);
  margin-top: 24px;
  max-width: 36em;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about__hero-actions .btn--outline {
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}

.page-about__hero-actions .btn--outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
}

.page-about__hero-metrics {
  display: grid;
  gap: 14px;
}

.page-about__hero-stat {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-pill);
  padding: 22px 26px;
  backdrop-filter: blur(8px);
}

.page-about__hero-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-orange);
}

.page-about__hero-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.78);
  margin-top: 8px;
}

.page-about__pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  width: calc(100% - 48px);
  max-width: var(--container);
  margin: -52px auto 40px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  border-radius: var(--radius-pill);
  box-shadow: var(--about-shadow);
  position: relative;
  z-index: 5;
}

.page-about__pills .tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  background: transparent;
  color: var(--about-ink);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background var(--duration) var(--ease), color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}

.page-about__pills .tag:hover {
  background: var(--about-warm);
  border-color: rgba(22, 38, 77, 0.12);
}

.page-about__pills .tag--active {
  background: var(--about-ink);
  color: #fff;
}

.page-about__vault {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  max-width: var(--container);
  margin-inline: auto;
  padding: 0 24px 64px;
}

.page-about__rail {
  min-width: 0;
}

.page-about__rail-card {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 0%, rgba(255, 122, 0, 0.28) 0%, transparent 220px),
    linear-gradient(165deg, var(--about-ink) 0%, var(--about-ink-1) 100%);
  color: #fff;
  border-radius: var(--about-radius);
  padding: 28px 24px;
  box-shadow: var(--about-shadow);
}

.page-about__rail-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about__rail-brand .brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--about-orange);
  color: var(--about-ink);
  font-size: 22px;
  font-weight: 700;
}

.page-about__rail-brand .brand__name {
  display: block;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.page-about__rail-brand .brand__sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--about-neon);
  margin-top: 2px;
}

.page-about__rail-text {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  line-height: 1.7;
  margin: 20px 0 16px;
}

.page-about__rail-stats {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 20px;
}

.page-about__rail-stats li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
}

.page-about__rail-stats strong {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
}

.page-about__rail-btn {
  width: 100%;
  margin-top: 8px;
}

.page-about__rail-note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.6);
}

.page-about__files {
  display: grid;
  gap: 32px;
  min-width: 0;
}

.page-about__file {
  position: relative;
  background: var(--about-paper);
  border-radius: var(--about-radius);
  box-shadow: var(--about-shadow);
  padding: 36px 28px 32px;
  scroll-margin-top: 24px;
}

.page-about__file::before {
  content: "";
  position: absolute;
  top: -12px;
  left: 28px;
  width: 80px;
  height: 26px;
  background: var(--file-accent, var(--about-orange));
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  border-radius: 4px 4px 0 0;
  z-index: 2;
}

.page-about__file--orange {
  --file-accent: var(--about-orange);
}

.page-about__file--green {
  --file-accent: var(--about-neon);
}

.page-about__file--blue {
  --file-accent: var(--about-ink-2);
}

.page-about__file-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 20px;
  margin-bottom: 28px;
  border-bottom: 1px solid rgba(10, 17, 40, 0.08);
}

.page-about .section-title {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 28px;
  line-height: 1.2;
  margin: 0;
}

.page-about .section-title__en {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  margin-top: 6px;
  font-weight: 500;
  text-transform: uppercase;
  color: var(--file-accent, var(--about-ink-2));
}

.page-about__file-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--file-accent, var(--about-ink-2));
  background: var(--about-warm);
  border-radius: 999px;
  padding: 6px 12px;
  flex-shrink: 0;
}

.page-about__file-body {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(10, 17, 40, 0.82);
}

.page-about__file-body p {
  margin: 0 0 16px;
}

.page-about__file-body p:last-child {
  margin-bottom: 0;
}

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

.page-about__mission-copy {
  display: grid;
  align-content: center;
  gap: 16px;
}

.page-about__mission-copy p {
  margin: 0;
}

.page-about__visual {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  background: var(--about-warm);
}

.page-about__visual--overlay {
  position: relative;
}

.page-about__visual--overlay::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 122, 0, 0.18) 0%, rgba(10, 17, 40, 0.06) 60%);
  pointer-events: none;
}

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

.page-about__visual--wide {
  margin-top: 28px;
}

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

.page-about__timeline::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 12px;
  left: 18px;
  border-left: 2px dashed rgba(30, 58, 110, 0.38);
}

.page-about__milestone {
  position: relative;
  padding: 0 0 28px 44px;
}

.page-about__milestone:last-child {
  padding-bottom: 8px;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--about-neon);
  box-shadow: 0 0 0 4px rgba(57, 255, 136, 0.2);
  z-index: 1;
}

.page-about__milestone details summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 8px 0;
  user-select: none;
}

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

.page-about__milestone details summary:hover .page-about__mile-label {
  color: var(--about-orange);
}

.page-about__milestone details[open] summary {
  margin-bottom: 12px;
}

.page-about__year {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--about-ink-2);
}

.page-about__mile-label {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--about-ink);
  transition: color var(--duration) var(--ease);
}

.page-about__mile-arrow {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--about-ink-2);
  background: var(--about-warm);
  padding: 4px 10px;
  border-radius: 999px;
  flex-shrink: 0;
}

.page-about__milestone details:not([open]) .page-about__mile-arrow::before {
  content: "展开详情";
}

.page-about__milestone details[open] .page-about__mile-arrow::before {
  content: "收起详情";
}

.page-about__milestone details > p {
  margin: 0;
  padding: 14px 16px;
  background: var(--about-warm);
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(10, 17, 40, 0.75);
}

.page-about__data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about__data-map-panel {
  min-width: 0;
}

.page-about__data-map {
  background: var(--about-paper);
  border: 1px solid rgba(22, 38, 77, 0.08);
  border-radius: 18px;
  padding: 12px;
  box-shadow: 0 6px 24px rgba(10, 17, 40, 0.08);
}

.page-about__data-map svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about__data-map text {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
}

.page-about__data-caption {
  font-size: 13px;
  color: rgba(10, 17, 40, 0.58);
  margin-top: 14px;
  text-align: center;
  line-height: 1.6;
}

.page-about__data-list {
  display: grid;
  gap: 12px;
}

.page-about__data-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--about-warm);
  border-radius: 16px;
  padding: 18px 20px;
  border-left: 4px solid var(--about-orange);
}

.page-about__data-item strong {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--about-ink);
  white-space: nowrap;
}

.page-about__data-item span {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--about-ink-2);
  text-align: right;
}

.page-about__data-note {
  background: rgba(255, 122, 0, 0.08);
  border-radius: 16px;
  padding: 16px 20px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(10, 17, 40, 0.78);
  margin-top: 28px;
}

.page-about__inline-link {
  color: var(--about-orange);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
  transition: color var(--duration) var(--ease);
}

.page-about__inline-link:hover {
  color: var(--about-ink);
}

.page-about__figure-wide + .page-about__data-note,
.page-about__visual--wide + .page-about__data-note {
  margin-top: 16px;
}

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

.page-about__honor-card {
  position: relative;
  background: var(--about-warm);
  border-radius: 20px;
  padding: 24px 22px;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 4px 16px;
  align-items: start;
  border: 1px solid rgba(22, 38, 77, 0.06);
  transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}

.page-about__honor-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--about-shadow);
}

.page-about__honor-badge {
  grid-row: span 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 18px;
  background: var(--about-ink);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about__honor-card:nth-child(even) .page-about__honor-badge {
  background: var(--about-orange);
  color: var(--about-ink);
}

.page-about__honor-card h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  margin: 0;
  color: var(--about-ink);
}

.page-about__honor-card p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(10, 17, 40, 0.68);
  margin: 0;
}

.page-about__honor-note {
  margin-top: 28px;
  background: var(--about-ink);
  border-radius: 18px;
  padding: 24px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
  line-height: 1.8;
}

.page-about__honor-note a {
  color: var(--about-orange);
  text-underline-offset: 3px;
}

@media (max-width: 767px) {
  .page-about__hero {
    gap: 24px;
  }

  .page-about__hero-sub {
    font-size: 20px;
  }

  .page-about__hero-metrics {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .page-about__hero-stat {
    padding: 18px 16px;
  }

  .page-about__hero-num {
    font-size: 28px;
  }

  .page-about__pills {
    width: calc(100% - 32px);
    margin-top: -40px;
    padding: 10px;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .page-about__pills .tag {
    min-height: 40px;
    padding: 0 16px;
    white-space: nowrap;
  }

  .page-about__rail-stats {
    grid-template-columns: 1fr 1fr;
    gap: 0 16px;
  }
}

@media (min-width: 768px) {
  .page-about__hero {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .page-about__hero-metrics {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__mission-grid {
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 36px;
  }

  .page-about__data-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 36px;
  }

  .page-about__honor-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}

@media (min-width: 1024px) {
  .page-about__vault {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about__rail-card {
    position: sticky;
    top: 24px;
    padding: 32px 28px;
  }

  .page-about__rail-stats {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-about__file {
    padding: 44px 40px 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about__pills .tag,
  .page-about__honor-card,
  .page-about__file {
    transition: none;
  }
}