:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;width:100%;height:100%;overflow:hidden;background:#0a0a0a;color:#fafafa}.game-container{position:relative;width:100%;height:100vh;overflow:hidden;cursor:crosshair}.game-container canvas{display:block;width:100%;height:100%}.game-ui{position:absolute;top:0;left:0;right:0;pointer-events:none;z-index:10;padding:16px 20px;display:flex;justify-content:space-between;align-items:flex-start}.ui-left{display:flex;flex-direction:column;gap:8px}.hearts{display:flex;gap:6px;font-size:28px;filter:drop-shadow(0 2px 4px rgba(0,0,0,.5))}.score-display{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:20px;font-weight:700;color:#fbbf24;text-shadow:0 2px 4px rgba(0,0,0,.6)}.wave-display{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:14px;font-weight:600;color:#a78bfa;text-shadow:0 2px 4px rgba(0,0,0,.6);letter-spacing:2px}.ui-right{text-align:right}.high-score{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:#ffffff73;text-shadow:0 1px 3px rgba(0,0,0,.5)}.overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:20;pointer-events:auto}.overlay-bg{position:absolute;top:0;right:0;bottom:0;left:0;background:#000000bf;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.overlay-content{position:relative;text-align:center;padding:40px}.overlay-content h1{font-size:56px;font-weight:900;margin:0 0 8px;letter-spacing:-2px;color:#fff;text-shadow:0 4px 20px rgba(239,68,68,.5),0 0 40px rgba(239,68,68,.2)}.overlay-content h1 span{color:#ef4444}.overlay-content .subtitle{font-size:18px;color:#ffffff80;margin:0 0 32px;font-weight:400}.overlay-content .instructions{font-size:16px;color:#fff9;margin:0 0 32px;line-height:1.8}.game-over-score{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:28px;font-weight:700;color:#fbbf24;margin:12px 0 4px;text-shadow:0 2px 8px rgba(251,191,36,.3)}.game-over-wave{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:16px;font-weight:600;color:#a78bfa;margin:0 0 24px}.new-high-score{font-size:14px;color:#f59e0b;font-weight:600;margin:-8px 0 24px;text-shadow:0 0 12px rgba(245,158,11,.4)}.start-btn,.restart-btn{pointer-events:auto;cursor:pointer;border:none;border-radius:12px;padding:16px 48px;font-size:18px;font-weight:700;letter-spacing:1px;text-transform:uppercase;transition:transform .1s,box-shadow .1s}.start-btn{background:linear-gradient(135deg,#22c55e,#16a34a);color:#fff;box-shadow:0 4px 20px #22c55e4d}.start-btn:hover{transform:scale(1.05);box-shadow:0 6px 28px #22c55e73}.restart-btn{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;box-shadow:0 4px 20px #ef44444d}.restart-btn:hover{transform:scale(1.05);box-shadow:0 6px 28px #ef444473}.start-btn:active,.restart-btn:active{transform:scale(.97)}