html,body{margin:0;padding:0;overflow:hidden;background:#0a0e14;font-family:Segoe UI,Arial,sans-serif}#start-overlay,#gameover-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:999;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:#fff;background:radial-gradient(circle at center,#1a2430,#05070a)}#start-overlay h1,#gameover-overlay h1{font-size:2.4rem;letter-spacing:.1em;color:#7cfc9c;margin-bottom:.5rem}#start-overlay .hint{font-size:.85rem;color:#9aa5b1;margin:1rem 2rem;line-height:1.5}#start-btn,#restart-btn{margin-top:1.5rem;padding:.9rem 2.4rem;font-size:1.1rem;background:#7cfc9c;color:#0a0e14;border:none;border-radius:6px;font-weight:700;cursor:pointer}#start-btn:active,#restart-btn:active{transform:scale(.97)}.hidden{display:none!important}