/* ===== DaNiu-AI 主题系统 ===== */
:root {
    --bg: #03050b;
    --bg-card: rgba(18,20,31,0.5);
    --bg-sidebar: rgba(18,20,31,0.8);
    --border: rgba(0,229,255,0.08);
    --text: #e8edf5;
    --text-sec: #94a3b8;
    --text-dim: #64748b;
    --cyan: #00e5ff;
    --purple: #7c4dff;
    --green: #22c55e;
    --red: #ef4444;
    --gradient: linear-gradient(135deg,#00e5ff,#7c4dff);
    --radius: 14px;
}
body.light-theme {
    --bg: #f0f2f8;
    --bg-card: rgba(255,255,255,0.65);
    --bg-sidebar: rgba(255,255,255,0.8);
    --border: rgba(0,229,255,0.15);
    --text: #1a1a2e;
    --text-sec: #475569;
    --text-dim: #94a3b8;
    --cyan: #0a9396;
    --purple: #7c4dff;
}
body { background: var(--bg); color: var(--text); font-family:'Inter','Noto Sans SC',sans-serif; }