*{box-sizing:border-box;margin:0;padding:0}
body{background:#000;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;font-family:'Press Start 2P',monospace;user-select:none;overflow:hidden}
#wrap{position:relative;width:640px;height:560px}
canvas{display:block;width:640px;height:560px;image-rendering:pixelated}
#hud{position:absolute;top:0;left:0;width:100%;display:flex;justify-content:space-between;align-items:flex-start;padding:6px 10px;pointer-events:none;z-index:5}
#hud-left{display:flex;flex-direction:column;gap:3px}
#hud-right{display:flex;flex-direction:column;align-items:flex-end;gap:3px}
.hud-val{font-size:8px;color:#fff;text-shadow:1px 1px #000,0 0 8px rgba(255,200,0,.6)}
#s-combo{font-size:11px;color:#ffcc00;text-shadow:0 0 10px #ff8800;transition:transform .1s}
#s-special{font-size:7px;color:#88ffff}
#gauge-wrap{width:120px;height:8px;background:rgba(0,0,0,.6);border:1px solid #446;border-radius:4px;overflow:hidden}
#gauge-fill{height:100%;width:0%;background:linear-gradient(90deg,#4488ff,#88ffff);border-radius:4px;transition:width .2s}
#input-box{position:absolute;bottom:8px;left:50%;transform:translateX(-50%);background:rgba(0,0,0,.88);border:2px solid #fc0;border-radius:4px;padding:5px 18px;font-size:11px;color:#fc0;letter-spacing:2px;min-width:180px;text-align:center;pointer-events:none;z-index:5;transition:border-color .1s,box-shadow .1s}
#input-box.miss{border-color:#ff2200;box-shadow:0 0 12px #ff2200;color:#ff4400}
#overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(180deg,rgba(0,0,0,.15),rgba(0,0,0,.6));display:flex;flex-direction:column;align-items:center;justify-content:flex-end;padding-bottom:32px;z-index:20}
.menu-panel{display:flex;flex-direction:column;align-items:center;gap:12px;padding:20px 22px;border-radius:16px;background:rgba(8,10,16,.72);border:1px solid rgba(255,204,0,.25);backdrop-filter:blur(4px)}
#overlay h1{font-size:28px;color:#ff4400;text-shadow:0 0 20px #ff2200,2px 2px #000;text-align:center;line-height:1.4}
#overlay .sub{font-size:9px;color:#ffcc88;margin-top:-4px}
#diff-wrap{display:flex;gap:8px}
.diff-btn{font-family:'Press Start 2P',monospace;font-size:8px;background:rgba(12,12,12,.9);color:#ffe8b2;border:1px solid rgba(255,212,120,.4);border-radius:6px;padding:9px 14px;min-width:90px;cursor:pointer;transition:all .1s}
.diff-btn.active,.diff-btn:hover{background:rgba(255,120,54,.25);color:#fff;border-color:#ffcc66}
#start-btn{font-family:'Press Start 2P',monospace;font-size:10px;background:linear-gradient(180deg,#ff9a32,#db4400);color:#fff;border:none;border-radius:8px;padding:13px 30px;cursor:pointer;box-shadow:0 6px 16px rgba(227,82,0,.4)}
#start-btn:hover{background:linear-gradient(180deg,#ffb14d,#e65510);transform:scale(1.03)}
#mode-btn{font-family:'Press Start 2P',monospace;font-size:6px;background:rgba(0,0,0,.6);color:#ffdca9;border:1px solid rgba(255,204,0,.25);border-radius:6px;padding:7px 12px;cursor:pointer}
#mode-btn:hover{color:#fff;border-color:#ffe08a}
p.hint{margin-top:8px;font-family:'Press Start 2P',monospace;font-size:6px;color:#333;text-align:center}
#combo-flash{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-family:'Press Start 2P',monospace;font-size:0px;color:#ffcc00;text-shadow:0 0 20px #ff8800;text-align:center;pointer-events:none;z-index:30;opacity:0;transition:opacity .15s}
#rage-banner{position:absolute;top:80px;left:50%;transform:translateX(-50%);font-family:'Press Start 2P',monospace;font-size:14px;color:#ff2200;text-shadow:0 0 20px #ff4400;pointer-events:none;z-index:30;opacity:0}
#special-flash{position:absolute;top:30%;left:50%;transform:translate(-50%,-50%);font-family:'Press Start 2P',monospace;font-size:0;color:#88ffff;text-shadow:0 0 30px #4488ff;text-align:center;pointer-events:none;z-index:35;opacity:0}
#upgrade-panel{position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.85);display:none;flex-direction:column;align-items:center;justify-content:center;gap:16px;z-index:40}
#upgrade-panel h2{font-size:11px;color:#ffcc00;text-shadow:0 0 12px #ff8800}
.upg-btn{font-family:'Press Start 2P',monospace;font-size:7px;background:rgba(20,20,40,.9);color:#fff;border:1px solid #4488ff;border-radius:8px;padding:12px 20px;width:260px;cursor:pointer;line-height:1.6;transition:all .15s}
.upg-btn:hover{background:rgba(60,80,180,.4);border-color:#88ffff;color:#88ffff}