.dynamic-bg{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:-2;overflow:hidden;filter:blur(80px);background:radial-gradient(circle at center,rgba(255,255,255,.2) 0%,rgba(0,0,0,.9) 100%);animation:bgPulse 14s ease-in-out infinite alternate}.supernova-flash{position:fixed;top:0;left:0;width:100vw;height:100vh;background:radial-gradient(circle at center,rgba(255,255,255,.9),rgba(255,255,200,.2),transparent 70%);z-index:-1;opacity:0;pointer-events:none;animation:flashFade 1.5s ease-out forwards}