:root{--bg: #0f1419;--panel: #1a2027;--panel-2: #232b35;--text: #e6edf3;--muted: #8b98a5;--accent: #3b82f6;--user: #2563eb;--border: #2d3742;--error: #f87171}*{box-sizing:border-box}body{margin:0}.app{font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);height:100vh;display:flex;flex-direction:column}.app-header{padding:14px 20px;border-bottom:1px solid var(--border);display:flex;align-items:baseline;gap:12px}.app-header h1{font-size:18px;margin:0}.subtitle{color:var(--muted);font-size:13px}.auth-warn{margin-left:auto;color:var(--error);font-size:12px}.app-main{flex:1;overflow:hidden;display:flex;justify-content:center}.app-footer{padding:8px 20px;border-top:1px solid var(--border);color:var(--muted);font-size:12px;text-align:center}.chat-layout{width:100%;display:flex;height:100%}.sessions{width:210px;flex:0 0 210px;border-right:1px solid 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