:root{--darkbg:#0a0a0a;--primary:#2196f3;--text-light:#f0f0f0;--text-muted:#aaa;--border-radius:12px;--shadow:rgba(0,0,0,0.7);--max-width:1200px;--transition:0.3s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:var(--darkbg);color:var(--text-light);line-height:1.6}