@import url("https://fonts.googleapis.com/css2?family=Bitter:wght@400;600;700&family=DM+Sans:wght@300;400;500&display=swap");:root{--bg:#0f1117;--bg-card:#181c27;--bg-input:#1e2333;--border:#2a3045;--accent:#f0a500;--accent-dim:rgba(240,165,0,.12);--text-primary:#e8eaf2;--text-secondary:#8892aa;--text-muted:#555f78;--user-bubble:#1e3a5f;--user-border:#2a5080;--bot-bubble:#1e2333;--bot-border:#2a3045;--radius:14px;--radius-sm:8px;--tab-h:54px}*{margin:0;padding:0;box-sizing:border-box}body,html{height:100%;overflow:hidden;background:var(--bg);color:var(--text-primary);font-family:DM Sans,sans-serif;font-weight:400;-webkit-font-smoothing:antialiased}.mobile-tabs{display:none;position:fixed;bottom:0;left:0;right:0;height:var(--tab-h);background:var(--bg-card);border-top:1px solid var(--border);z-index:100;flex-direction:row}.mobile-tab{flex:1 1;background:none;border:none;color:var(--text-muted);font-family:DM 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