*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,sans-serif;background:#0f0f0f;color:#efefef;min-height:100vh;display:flex;align-items:center;justify-content:center}main{text-align:center;display:flex;flex-direction:column;align-items:center;gap:1.5rem}h1{font-size:2rem}p{color:#aaa;font-size:1.1rem}button{padding:.6rem 1.4rem;font-size:1rem;border:1px solid #555;border-radius:6px;background:#1e1e1e;color:#efefef;cursor:pointer;transition:background .2s}button:hover{background:#2e2e2e}