*{margin:0;padding:0;box-sizing:border-box}body{overflow:hidden;background:#0a0a0a;font-family:Share Tech Mono,monospace;cursor:none}#game-container{position:relative;width:100vw;height:100vh}#game-canvas{display:block;width:100%;height:100%;cursor:none}#start-screen{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(135deg,#1a0a0a,#2d1515,#0d0d0d);z-index:10;animation:pulse-bg 4s ease-in-out infinite}@keyframes pulse-bg{0%,to{opacity:1}50%{opacity:.95}}#start-screen h1{font-family:Orbitron,sans-serif;font-size:clamp(2.5rem,8vw,5rem);font-weight:900;color:#e63946;text-shadow:0 0 30px rgba(230,57,70,.6);letter-spacing:.2em;margin-bottom:.25em}#start-screen .subtitle{font-size:clamp(.9rem,2.5vw,1.2rem);color:#8b2635;letter-spacing:.5em;margin-bottom:3em}#start-screen .instructions{color:#888;font-size:.95rem;margin-bottom:2.5em;text-align:center;max-width:400px}#start-btn{font-family:Orbitron,sans-serif;font-size:1.2rem;padding:1em 2.5em;background:linear-gradient(180deg,#e63946,#c1121f);border:2px solid #ff6b6b;color:#fff;cursor:pointer;letter-spacing:.15em;transition:all .2s;box-shadow:0 0 20px #e6394666}#start-btn:hover{transform:scale(1.05);box-shadow:0 0 30px #e63946b3;background:linear-gradient(180deg,#ff4757,#e63946)}#hud{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:5}.hud-top{position:absolute;top:20px;left:0;right:0;display:flex;justify-content:space-between;padding:0 30px;font-size:1.1rem;color:#0f8;text-shadow:0 0 10px rgba(0,255,136,.5)}#crosshair{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:24px;height:24px;border:2px solid rgba(255,255,255,.9);border-radius:50%;background:transparent;box-shadow:0 0 8px #000c}#crosshair:before,#crosshair:after{content:"";position:absolute;background:#ffffffe6}#crosshair:before{width:2px;height:8px;top:50%;left:50%;transform:translate(-50%,-50%)}#crosshair:after{width:8px;height:2px;top:50%;left:50%;transform:translate(-50%,-50%)}.ammo-warning{position:absolute;top:50%;left:50%;transform:translate(-50%,-150%);font-size:1.5rem;font-weight:700;color:red;text-shadow:0 0 20px rgba(255,0,0,.8),0 0 40px rgba(255,0,0,.6);animation:ammo-warning-blink .5s ease-in-out infinite;z-index:10;pointer-events:none;font-family:Orbitron,sans-serif;letter-spacing:.1em}.ammo-warning.hidden{display:none}@keyframes ammo-warning-blink{0%,to{opacity:1;transform:translate(-50%,-150%) scale(1)}50%{opacity:.5;transform:translate(-50%,-150%) scale(1.1)}}.health-bar-container{position:absolute;bottom:30px;left:50%;transform:translate(-50%);width:300px;height:24px;background:#0009;border:2px solid #333;border-radius:4px;overflow:hidden;display:flex;align-items:center;justify-content:center}#health-bar{position:absolute;left:0;top:0;bottom:0;width:100%;background:linear-gradient(90deg,#e63946,#c1121f);transition:width .2s}#health-text{position:relative;z-index:1;color:#fff;font-weight:700;text-shadow:0 1px 2px #000}.exp-bar-container{position:absolute;bottom:70px;left:50%;transform:translate(-50%);width:300px;height:20px;background:#0009;border:2px solid #333;border-radius:4px;overflow:hidden;display:flex;align-items:center;justify-content:center}#exp-bar{position:absolute;left:0;top:0;bottom:0;width:0%;background:linear-gradient(90deg,#0f8,#0a6);transition:width .2s}#exp-text{position:relative;z-index:1;color:#fff;font-size:.9rem;font-weight:700;text-shadow:0 1px 2px #000}#upgrade-menu{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#000000e6;z-index:20}#upgrade-menu.hidden{display:none}#upgrade-menu h2{font-family:Orbitron,sans-serif;font-size:2.5rem;color:#0f8;margin-bottom:2rem;text-shadow:0 0 20px rgba(0,255,136,.5)}.upgrade-cards{display:flex;gap:2rem;justify-content:center;flex-wrap:wrap}.upgrade-card{width:250px;padding:2rem;background:linear-gradient(135deg,#141428f2,#0a0a14f2);border:3px solid #00ff88;border-radius:12px;cursor:pointer;transition:all .3s;text-align:center}.upgrade-card:hover{transform:scale(1.05);border-color:#0ff;box-shadow:0 0 30px #0f89;background:linear-gradient(135deg,#1e1e32f2,#14141ef2)}.upgrade-card h3{font-family:Orbitron,sans-serif;font-size:1.5rem;color:#0f8;margin-bottom:1rem;text-shadow:0 0 10px rgba(0,255,136,.5)}.upgrade-card p{color:#ccc;font-size:1rem;line-height:1.5}#pause-menu{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#000000bf;z-index:15}#pause-menu.hidden{display:none}#pause-menu{cursor:default}#pause-menu button{cursor:pointer}.pause-content{text-align:center;padding:2rem;min-width:320px}.pause-content h2{font-family:Orbitron,sans-serif;font-size:2rem;color:#e63946;margin-bottom:1.5rem}.hero-display{background:#141428e6;border:2px solid #333;border-radius:8px;padding:1.5rem;margin-bottom:1.5rem}.hero-display h3{font-size:1rem;color:#0f8;margin-bottom:1rem;letter-spacing:.1em}.hero-stats{display:flex;justify-content:center;gap:1.5rem;margin-bottom:1rem;color:#ccc}.hero-stats p span{color:#fff;font-weight:700}.hero-avatar{width:120px;height:120px;margin:0 auto;background:linear-gradient(135deg,#2d2d4a,#1a1a2e);border:2px solid #e63946;border-radius:8px;overflow:hidden;position:relative}.hero-avatar canvas{width:100%!important;height:100%!important;display:block;position:absolute;top:0;left:0}#resume-btn{font-family:Orbitron,sans-serif;font-size:1rem;padding:.8em 2em;background:#e63946;border:2px solid #ff6b6b;color:#fff;cursor:pointer;transition:all .2s}#resume-btn:hover{background:#ff4757;transform:scale(1.05)}#game-over{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#000000d9;z-index:10}#game-over.hidden{display:none}#game-over h2{font-family:Orbitron,sans-serif;font-size:3rem;color:#e63946;margin-bottom:.5em}#game-over #final-score{font-size:1.5rem;color:#0f8;margin-bottom:2em}#restart-btn{font-family:Orbitron,sans-serif;font-size:1rem;padding:.8em 2em;background:#e63946;border:2px solid #ff6b6b;color:#fff;cursor:pointer;transition:all .2s}#restart-btn:hover{background:#ff4757;transform:scale(1.05)}.zombie-health-bar{position:relative;width:60px;height:8px;background:transparent;border:1px solid rgba(255,255,255,.3);border-radius:4px;overflow:hidden}.health-bar-bg{position:absolute;top:0;right:0;bottom:0;left:0;background:#0009}.health-bar-fill{position:absolute;left:0;top:0;bottom:0;width:100%;background:#0f0;transition:width .1s,background .1s;border-radius:3px}.damage-number{color:#fff;font-family:Orbitron,sans-serif;font-size:16px;font-weight:900;text-shadow:0 0 6px rgba(0,0,0,.9),0 0 10px rgba(255,255,255,.45);pointer-events:none;white-space:nowrap;transform:translate(-50%,-50%) scale(1);transition:transform .06s linear;will-change:transform,opacity}.damage-number.crit{color:#ffd64a;font-size:22px;text-shadow:0 0 10px rgba(255,120,0,.9),0 0 18px rgba(255,0,0,.6)}