:root{color-scheme:dark;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;line-height:1.5;--neon-green: #00ff88;--bg-dark: #0a0a0a;--bg-card: #0d1117;--bg-input: #161b22;--border-color: #1a2332;--text-primary: #e6edf3;--text-secondary: #8b949e;--user-bubble: #0a2e1a;--ai-bubble: #0d1117}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;background:var(--bg-dark);color:var(--text-primary)}.app{display:flex;flex-direction:column;height:100vh;overflow:hidden}.header{display:flex;align-items:center;justify-content:space-between;padding:.75rem 1.5rem;border-bottom:1px solid 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