:root{color-scheme:light;--bg:#f4f6f3;--panel:#ffffff;--ink:#1d2521;--muted:#637068;--line:#dce4de;--accent:#16785f;--accent-dark:#105d49;--accent-soft:#e8f5ef;--warn:#934319;--warn-bg:#fff2e7}*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:Arial,Microsoft YaHei,sans-serif;letter-spacing:0}button,input,textarea{font:inherit}button{border:1px solid var(--line);border-radius:8px;background:var(--panel);color:var(--ink);cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.appShell{display:grid;grid-gap:16px;gap:16px;grid-template-columns:minmax(210px,248px) minmax(0,1fr);height:100dvh;margin:0 auto;max-width:1120px;padding:16px}.shell{gap:12px;max-width:560px;width:100%}.conversationSidebar,.shell{display:flex;flex-direction:column;min-height:0;overflow:hidden}.conversationSidebar{background:var(--panel);border:1px solid 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