@keyframes pageLivePulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(163,255,18,0.4);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(163,255,18,0);
  }
}

.page-about {
  --about-card-accent: var(--cyan);
  color: var(--text-main);
  background-color: var(--bg);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.page-about .breadcrumbs a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  text-decoration: underline;
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--text-main);
}

.page-about .about-hero {
  position: relative;
  padding: 36px 0 48px;
  overflow: hidden;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 44px 44px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -80px;
  top: 40%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,229,255,0.08), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  padding: 6px 12px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.page-about .about-hero__eyebrow .live-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  animation: pageLivePulse 2s infinite;
}

.page-about .about-hero__text h1 {
  margin: 16px 0 20px;
  font-family: var(--font-heading);
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.page-about .about-hero__lead {
  max-width: 46em;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .about-hero__fact {
  position: relative;
  margin-top: 28px;
  padding: 0 0 0 18px;
  border-left: 2px solid var(--gold);
}

.page-about .about-hero__fact-label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-muted);
}

.page-about .about-hero__fact-year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 56px;
  line-height: 1;
  color: var(--text-main);
}

.page-about .about-hero__fact-note {
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--text-muted);
}

.page-about .about-milestone-section,
.page-about .about-rule-section,
.page-about .about-yunnan-section {
  padding: 48px 0;
}

.page-about .about-milestone-section {
  border-top: 1px solid var(--line);
}

.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.page-about .section-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
  background: var(--surface-1);
}

.page-about .section-title {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
}

.page-about .section-desc {
  flex-basis: 100%;
  margin: -4px 0 0;
  font-size: 14px;
  color: var(--text-muted);
}

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

.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 20px;
  bottom: 20px;
  left: 72px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--line) 40%, var(--line) 90%, transparent 100%);
}

.page-about .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 20px;
  padding: 24px 0;
  transition: background-color .2s ease;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 66px;
  top: 30px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--gold);
  z-index: 1;
}

.page-about .timeline-item__year {
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1.2;
  text-align: right;
  color: var(--gold);
  padding-right: 8px;
}

.page-about .timeline-item__body h3 {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--text-main);
}

.page-about .timeline-item__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-about .timeline-item:hover {
  background: linear-gradient(90deg, rgba(255,209,102,0.05), transparent 70%);
}

.page-about .timeline-item:hover::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0,229,255,0.15);
}

.page-about .timeline-item:hover .timeline-item__year,
.page-about .timeline-item:hover .timeline-item__body h3 {
  color: var(--cyan);
}

.page-about .about-timeline-visual {
  position: relative;
}

.page-about .about-timeline-visual img,
.page-about .about-entry-visual img,
.page-about .about-yunnan__visual img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  object-fit: cover;
}

.page-about .about-timeline-visual__meta {
  position: absolute;
  left: 12px;
  bottom: 12px;
  margin: 0;
  padding: 5px 10px;
  background: rgba(12,12,20,0.75);
  border: 1px solid rgba(50,50,71,0.8);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.page-about .about-entry-section {
  padding: 48px 0 56px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(0,229,255,0.04), transparent 40%),
    linear-gradient(315deg, rgba(163,255,18,0.03), transparent 40%);
}

.page-about .about-entry-visual {
  margin-bottom: 24px;
}

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

.page-about .entry-card {
  --card-accent: var(--cyan);
  position: relative;
  display: block;
  padding: 26px 22px;
  background: var(--surface-1);
  border: 1px solid var(--line);
  border-top: 3px solid var(--card-accent);
  border-radius: 14px;
  color: var(--text-main);
  text-decoration: none;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease, background-color .25s ease;
}

.page-about .entry-card--green {
  --card-accent: var(--green);
}

.page-about .entry-card--gold {
  --card-accent: var(--gold);
}

.page-about .entry-card__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--card-accent);
}

.page-about .entry-card h3 {
  margin: 10px 0 8px;
  font-size: 20px;
}

.page-about .entry-card p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about .entry-card__more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--card-accent);
}

.page-about .entry-card:hover {
  transform: translateY(-4px);
  border-color: var(--card-accent);
  background: var(--surface-2);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.25);
}

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

.page-about .rule-data-card {
  position: relative;
  overflow: hidden;
  padding: 22px 22px 24px 28px;
  background: linear-gradient(135deg, var(--surface-1), var(--surface-2));
  border: 1px solid var(--line);
  border-radius: 14px;
}

.page-about .rule-data-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--green);
}

.page-about .rule-data-card:nth-child(3n+2)::after {
  background: var(--gold);
}

.page-about .rule-data-card:nth-child(3n)::after {
  background: var(--cyan);
}

.page-about .rule-data-card__value {
  display: block;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--text-main);
}

.page-about .rule-data-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.page-about .rule-data-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about .about-yunnan-section {
  border-bottom: 1px solid var(--line);
}

.page-about .about-yunnan__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}

.page-about .about-yunnan__content > .section-index {
  margin-bottom: 16px;
}

.page-about .about-yunnan__content h2 {
  margin: 0 0 16px;
  font-size: 28px;
}

.page-about .about-yunnan__content p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .about-yunnan__content p:last-of-type {
  margin-bottom: 20px;
}

.page-about .about-yunnan-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-version-strip {
  padding: 0 0 48px;
}

.page-about .about-version-strip .container {
  border-top: 1px dashed var(--line);
  padding-top: 32px;
}

.page-about .about-version-badge {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 26px;
  background:
    linear-gradient(135deg, rgba(0,229,255,0.08), transparent 45%),
    linear-gradient(45deg, rgba(163,255,18,0.04), transparent 40%),
    var(--surface-1);
  border: 1px solid #2A2A3D;
  border-radius: 18px;
  box-shadow: 0 0 0 1px rgba(0,229,255,0.03), inset 0 1px 0 rgba(255,255,255,0.03);
}

.page-about .about-version-badge__main {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 240px;
}

.page-about .about-version-badge__icon {
  display: grid;
  place-items: center;
  flex: 0 0 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(0,229,255,0.1);
  border: 1px solid rgba(0,229,255,0.5);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
}

.page-about .about-version-badge__label {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.page-about .about-version-badge__id {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--text-main);
}

.page-about .about-version-badge__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-version-badge .btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease;
}

.page-about .about-version-badge .btn:hover {
  transform: translateY(-2px);
}

.page-about .about-more-links {
  padding: 0 0 56px;
}

.page-about .about-more-links__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-more-links__inner a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  background: var(--surface-1);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 13px;
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, transform .2s ease;
}

.page-about .about-more-links__inner a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

@media (min-width: 640px) {
  .page-about .about-rule-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 64px 0;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    gap: 40px;
    align-items: end;
  }

  .page-about .about-hero__fact {
    margin-top: 0;
  }

  .page-about .section-head {
    align-items: flex-end;
  }

  .page-about .section-desc {
    flex-basis: auto;
    max-width: 30em;
    margin-left: auto;
    text-align: right;
  }

  .page-about .about-milestone__layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-timeline-visual {
    position: sticky;
    top: 120px;
    margin-top: 28px;
  }

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

  .page-about .about-yunnan__grid {
    grid-template-columns: 1fr 1.1fr;
    gap: 40px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-rule-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}