:root{--color-bg:#f4f5ef;--color-surface:#fcfcf8;--color-border:#d4d8c9;--color-text:#252c22;--color-text-muted:#5f6757;--color-primary:#6b7a3e;--color-primary-hover:#566330;--color-danger:#dc2626;--color-danger-bg:#fef2f2;--color-user-bubble:#6b7a3e;--color-user-text:#f7f8f2;--color-assistant-bubble:#ecefe4;--color-assistant-text:#252c22;--color-thought-bg:#eef1e7;--color-thought-border:#c7d0b8;--color-thought-tool:#5f6f36;--radius-sm:6px;--radius-md:12px;--radius-lg:18px;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 2px 8px 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