*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0f172a;--bg-card:#1e293b;--bg-hover:#334155;--text:#e2e8f0;--text-dim:#94a3b8;--text-muted:#64748b;--accent:#3b82f6;--accent-hover:#2563eb;--user-bg:#1d4ed8;--bot-bg:#1e293b;--border:#334155;--error:#ef4444;--success:#22c55e;--sidebar-w:280px;--font:-apple-system,BlinkMacSystemFont,"Segoe 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.2s}.btn-new:hover{background:var(--accent-hover)}.btn-icon{background:none;color:var(--text-dim);font-size:18px;padding:4px 8px;border-radius:6px}.btn-icon:hover{background:var(--bg-hover);color:var(--text)}.user-info{font-size:12px;color:var(--text-muted);padding:4px 0}.chat-main{flex:1;display:flex;flex-direction:column;min-width:0}.chat-header{padding:12px 16px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px;flex-shrink:0}.chat-header .toggle-sidebar{background:none;color:var(--text-dim);font-size:20px;padding:4px}.chat-header .toggle-sidebar:hover{color:var(--text)}.chat-header .title{font-size:15px;font-weight:500;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-header .logout{background:none;color:var(--text-muted);font-size:13px;padding:6px 12px;border-radius:6px;border:1px solid var(--border)}.chat-header 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(max-width:768px){.sidebar{position:fixed;left:0;top:0;bottom:0;z-index:100;width:280px}.sidebar.collapsed{margin-left:-280px}.sidebar-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:99;display:none}.sidebar-overlay.show{display:block}.msg{max-width:90%}}