html{font-size:112.5%}:root{--bg-main:#fff;--bg-sidebar:#f8f9fa;--text-primary:#111827;--text-secondary:#6b7280;--border-color:#e5e7eb;--primary-color:#0f348c;--primary-hover:#0c2a70;--bg-input:#f3f4f6;--bg-user-msg:#e5e7eb;--text-user-msg:#111827;--bg-bot-msg:transparent;--bg-modal:#fff;--bg-overlay:#0006;--bg-hover:#e5e7eb;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--bg-bot-avatar:#fff}[data-theme=dark]{--bg-main:#121212;--bg-sidebar:#181818;--text-primary:#f9fafb;--text-secondary:#9ca3af;--border-color:#374151;--primary-color:#0f348c;--primary-hover:#133db0;--bg-input:#27272a;--bg-user-msg:#27272a;--text-user-msg:#f9fafb;--bg-bot-msg:transparent;--bg-modal:#18181b;--bg-overlay:#0009;--bg-hover:#27272a;--bg-bot-avatar:transparent}*{box-sizing:border-box;margin:0;padding:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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