:root{--bg-main:#fff;--bg-sidebar:#f9f9f9;--bg-input:#f4f4f4;--bg-hover:#ececec;--bg-user-msg:#f4f4f4;--bg-code:#f6f6f6;--text-primary:#0d0d0d;--text-secondary:#6e6e80;--text-tertiary:#8e8ea0;--text-link:#2964aa;--border-default:#e5e5e5;--border-light:#ebebeb;--accent:#0d0d0d;--accent-hover:#2b2b2b;--green:#10a37f;--green-hover:#1a7f64;--red:#ef4444;--sidebar-width:260px;--chat-max-width:768px;--radius-sm:8px;--radius-md:16px;--radius-lg:24px;--radius-full:9999px;--shadow-sm:0 1px 2px rgba(0,0,0,.05);--shadow-md:0 2px 8px rgba(0,0,0,.08);--transition:0.15s ease}[data-theme=dark]{--bg-main:#212121;--bg-sidebar:#171717;--bg-input:#2f2f2f;--bg-hover:#2f2f2f;--bg-user-msg:#2f2f2f;--bg-code:#1e1e1e;--text-primary:#ececec;--text-secondary:#b4b4b4;--text-tertiary:#8e8ea0;--text-link:#7ab7ff;--border-default:#424242;--border-light:#353535;--accent:#ececec;--accent-hover:#d4d4d4;--green:#10a37f;--green-hover:#1a7f64}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body,html{height:100%;font-family:ui-sans-serif,-apple-system,system-ui,Segoe UI,Helvetica,Apple Color Emoji,Arial,sans-serif,Segoe UI Emoji,Segoe UI 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