:root{--bg-color: #000;--accent-color: #00bfff;--error-color: #fa5454}*{margin:0;padding:0;box-sizing:border-box;user-select:none;-webkit-user-select:none}body,html{width:100vw;height:100vh;overflow:hidden;background-color:var(--bg-color);font-family:Roboto Flex,sans-serif}.app-container{display:flex;flex-direction:column;align-items:center;justify-content:center;width:100vw;height:100vh;position:relative}.background-container{position:fixed;top:0;left:0;width:100%;height:100%;z-index:1}.background-image{width:100%;height:100%;object-fit:cover;opacity:.6;pointer-events:none}.overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:radial-gradient(circle at center,transparent 0%,rgba(0,0,0,.8) 100%);z-index:2}.content{position:relative;z-index:3;text-align:center;width:100%}.main-title{font-weight:900;color:#fff;text-transform:uppercase;font-size:clamp(2.5rem,10vw,7rem);letter-spacing:clamp(4px,2vw,2rem);margin-bottom:1rem}.hero-subtitle{font-size:.8rem;letter-spacing:.6rem;color:#fff;text-indent:.6rem}.error-title .char{color:var(--error-color);text-shadow:0 0 20px rgba(250,84,84,.3)}.error-subtitle{font-size:clamp(.9rem,2vw,1.2rem);letter-spacing:.3rem;color:#ffffff80}.btn-container{margin-top:3rem}.action-btn{padding:1rem 2.5rem;font-size:.75rem;color:#fff;background:#ffffff08;border:1px solid rgba(255,255,255,.15);border-radius:2px;text-decoration:none;letter-spacing:.2rem;transition:all .5s cubic-bezier(.19,1,.22,1)}.action-btn:hover{background:#fff;color:#000;border-color:#fff;box-shadow:0 0 30px #fff3}.footer-container{position:absolute;bottom:2rem;z-index:10}.copyright{font-size:.7rem;color:#ffffff4d;letter-spacing:.1rem}.copyright a{color:inherit;text-decoration:none}