:root,[data-theme=light]{--bg-primary: #ffffff;--bg-secondary: #f5f5f5;--bg-tertiary: #e8e8e8;--text-primary: #1a1a1a;--text-secondary: #666666;--border-color: #e0e0e0;--accent-color: #2563eb;--accent-hover: #1d4ed8;--error-color: #dc2626;--success-color: #16a34a;--warning-color: #d97706;--user-bubble: #2563eb;--user-text: #ffffff;--assistant-bubble: #f0f0f0;--assistant-text: #1a1a1a;--input-bg: #ffffff;--input-text: #1a1a1a;--select-bg: #ffffff;--select-text: #1a1a1a;--error-msg-bg: #fef2f2;--error-msg-border: #fecaca}[data-theme=dark]{--bg-primary: #1e1e2e;--bg-secondary: #282840;--bg-tertiary: #313150;--text-primary: #e0e0e0;--text-secondary: #9a9ab0;--border-color: #3a3a55;--accent-color: #6d8cff;--accent-hover: #5a7aff;--error-color: #f87171;--success-color: #4ade80;--warning-color: #fbbf24;--user-bubble: #4a6cf7;--user-text: #ffffff;--assistant-bubble: #2a2a42;--assistant-text: #e0e0e0;--input-bg: #282840;--input-text: #e0e0e0;--select-bg: #282840;--select-text: #e0e0e0;--error-msg-bg: #3b1c1c;--error-msg-border: #6b2a2a}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg-primary);color:var(--text-primary);height:100vh;overflow:hidden}#root{height:100vh;display:flex;flex-direction:column}.app-container{display:flex;flex-direction:column;height:100vh}.app-header{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;border-bottom:1px solid var(--border-color);background:var(--bg-primary);flex-shrink:0}.app-header h1{font-size:16px;font-weight:600}.app-body{display:flex;flex:1;overflow:hidden}.chat-area{display:flex;flex-direction:column;flex:1;overflow:hidden;transition:flex .2s,width .2s}.chat-area.collapsed{flex:none;width:140px;overflow-y:hidden}.message-list{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px}.message{max-width:80%;padding:10px 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