:root{--bg: #F5F7FA;--bg-panel: #FFFFFF;--primary: #1565C0;--primary-light: #1976D2;--accent: #FF6F00;--accent-light: #FFA040;--text: #212121;--text-secondary: #546E7A;--text-muted: #90A4AE;--user-msg-bg: #E3F2FD;--agent-msg-bg: #FFF8E1;--system-msg-bg: #FFEBEE;--btn-start: #2E7D32;--btn-start-hover: #1B5E20;--btn-stop: #C62828;--btn-stop-hover: #B71C1C;--border: #CFD8DC;--border-light: #ECEFF1;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 4px 12px rgba(0, 0, 0, .1);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .12);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--font-display: "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", 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