/* 极光青蓝 */
.theme-aurora {
  --bg: #060b16;
  --bg-elev: #0c1424;
  --bg-soft: #152038;
  --ink: #eef4ff;
  --muted: #8ea0c0;
  --line: rgba(120, 180, 255, 0.12);
  --line-strong: rgba(120, 180, 255, 0.22);
  --accent: #5aa7ff;
  --accent-2: #a8d0ff;
  --accent-ink: #061018;
  --font-display: "DM Serif Display", serif;
  --font-body: "Outfit", sans-serif;
}
.theme-aurora .page-atmosphere {
  background:
    radial-gradient(600px 380px at 15% 10%, rgba(90,167,255,0.22), transparent 55%),
    radial-gradient(700px 420px at 90% 0%, rgba(70,220,200,0.12), transparent 50%),
    #060b16;
}
.theme-aurora .masthead-brand {
  background: linear-gradient(100deg, #eef4ff, #a8d0ff 45%, #5aa7ff 80%, #5adcc8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.theme-aurora .btn-primary {
  background: linear-gradient(135deg, #a8d0ff, #5aa7ff);
  color: var(--accent-ink);
}
.theme-aurora .cat-chip:hover {
  box-shadow: 0 0 0 1px rgba(90,167,255,0.35);
}