:root{--c-sky:#8ecae6;--c-sky-deep:#219ebc;--c-white:#fff;--c-accent:#e63946;--c-energy:#4cc9f0;--c-text:#073b4c;--hud-pad:16px}*{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--c-sky);touch-action:none;-webkit-user-select:none;user-select:none;width:100%;height:100%;font-family:Trebuchet MS,Segoe UI,system-ui,sans-serif;overflow:hidden}#game{width:100%;height:100%;display:block;position:fixed;inset:0}.hidden{display:none!important}#hud{padding:var(--hud-pad);pointer-events:none;z-index:10;align-items:center;gap:16px;display:flex;position:fixed;top:0;left:0;right:0}#score{color:var(--c-white);text-shadow:0 2px 8px #073b4c73;min-width:90px;font-size:32px;font-weight:900}#energy-wrap{border:2px solid var(--c-white);background:#ffffff59;border-radius:9px;flex:1;max-width:320px;height:18px;overflow:hidden}#energy-bar{background:linear-gradient(90deg, var(--c-energy), var(--c-sky-deep));border-radius:7px;width:0%;height:100%;transition:width .15s ease-out}#energy-wrap.full #energy-bar{background:linear-gradient(90deg, var(--c-energy), var(--c-accent));animation:.7s ease-in-out infinite alternate pulse}@keyframes pulse{0%{filter:brightness()}to{filter:brightness(1.6)}}#power-btn{pointer-events:auto;color:var(--c-white);background:var(--c-accent);cursor:pointer;border:none;border-radius:24px;padding:8px 20px;font-size:18px;font-weight:900;animation:.5s ease-in-out infinite alternate pulse}#mute-btn{pointer-events:auto;cursor:pointer;background:0 0;border:none;margin-left:auto;font-size:22px}.overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:20;text-align:center;background:#073b4c8c;flex-direction:column;justify-content:center;align-items:center;gap:24px;padding:24px;display:flex;position:fixed;inset:0}.overlay h1{letter-spacing:.06em;color:var(--c-white);text-shadow:0 4px 0 var(--c-accent), 0 8px 24px #0006;font-size:clamp(40px,9vw,88px);font-weight:900}.overlay p{color:var(--c-white);font-size:18px;line-height:1.6}.overlay button{letter-spacing:.08em;color:var(--c-white);background:var(--c-accent);cursor:pointer;border:none;border-radius:32px;padding:14px 48px;font-size:24px;font-weight:900;transition:transform .1s;box-shadow:0 6px #00000040}.overlay button:hover{transform:scale(1.05)}.overlay button:active{transform:translateY(4px);box-shadow:0 2px #00000040}#final-score{font-size:28px;font-weight:700}