/* 欧雅AI 科技感主题增强（叠加在应用自带 dark 模式之上） */
html.dark body{
  background:
    radial-gradient(900px 480px at 85% -10%, rgba(79,116,255,.10), transparent 60%),
    radial-gradient(720px 420px at 0% 100%, rgba(34,211,238,.07), transparent 60%),
    #0a0f1e;
}
html.dark ::selection{background:rgba(99,128,255,.45);color:#fff}
html.dark ::-webkit-scrollbar{width:10px;height:10px}
html.dark ::-webkit-scrollbar-track{background:transparent}
html.dark ::-webkit-scrollbar-thumb{background:rgba(148,163,184,.22);border-radius:8px}
html.dark ::-webkit-scrollbar-thumb:hover{background:rgba(148,163,184,.38)}
html.dark *{scrollbar-width:thin;scrollbar-color:rgba(148,163,184,.3) transparent}