:root{--bg-primary: #f4f7f9;--bg-sidebar: #0f172a;--bg-card: #ffffff;--border-color: #e2e8f0;--text-main: #1e293b;--text-muted: #64748b;--accent-blue: #2563eb;--accent-hover: #1d4ed8;--shadow-sm: 0 1px 3px rgba(0,0,0,.05);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06)}body.dark-theme{--bg-primary: #121212;--bg-sidebar: #0a0a0a;--bg-card: #1e1e1e;--border-color: #333333;--text-main: #f1f5f9;--text-muted: #94a3b8;--accent-blue: #3b82f6;--accent-hover: #60a5fa;--shadow-sm: 0 1px 3px rgba(0,0,0,.3);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.4)}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-primary);color:var(--text-main);transition:background-color .4s ease,color .4s ease}