:root{font-family:Hiragino Sans,Hiragino Kaku Gothic ProN,Noto Sans JP,-apple-system,BlinkMacSystemFont,sans-serif;color-scheme:light;--bg:#f7f8fa;--fg:#1a1a2e;--fg-muted:#6b7280;--border:#e5e7eb;--user-bg:#4f46e5;--user-fg:#ffffff;--assistant-bg:#ffffff;--assistant-fg:#1a1a2e;--accent:#4f46e5;--accent-hover:#4338ca;--accent-end:#7c3aed;--accent-tint-light:#eef2ff;--accent-tint-mid:#e0e7ff;--accent-tint-dark:#c7d2fe;--shadow-accent-xs:rgba(79,70,229,0.1);--shadow-accent-sm:rgba(79,70,229,0.2);--shadow-accent-md:rgba(79,70,229,0.3);--surface:#ffffff;--sidebar-bg:#111827;--sidebar-fg:#e5e7eb;--sidebar-fg-muted:#9ca3af;--sidebar-hover:#1f2937;--sidebar-active:#374151;--sidebar-width:280px;--shadow-sm:0 1px 2px rgba(0,0,0,0.05);--shadow-md:0 4px 12px 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