body,html{margin:0;padding:0;width:100%;height:100%;overflow:hidden;background-color:#111;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;color:#fff}#game-container{position:relative;width:100%;height:100%}canvas{display:block}#ui-layer{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none}#hud{position:absolute;top:0;left:0;width:100%;padding:10px;box-sizing:border-box;display:flex;flex-direction:column;gap:10px}#xp-bar-container{width:100%;height:20px;background-color:#333;border:2px solid #555;border-radius:10px;overflow:hidden}#xp-bar{width:0%;height:100%;background-color:#00bfff;transition:width .2s}#stats{display:flex;justify-content:space-between;font-size:20px;font-weight:700;text-shadow:2px 2px 0 #000}#weapon-hud{display:flex;gap:10px}.weapon-tile{width:40px;height:40px;background-color:#ffffff1a;border:1px solid rgba(255,255,255,.3);border-radius:4px;position:relative;display:flex;justify-content:center;align-items:center;backdrop-filter:blur(2px)}.weapon-tile img{max-width:80%;max-height:80%}.weapon-level{position:absolute;bottom:-2px;right:-2px;background-color:gold;color:#000;font-size:10px;padding:1px 3px;border-radius:3px;font-weight:700;pointer-events:none}.hidden{display:none!important}#game-over-screen,#level-up-screen{position:absolute;top:0;left:0;width:100%;height:100%;background-color:#000c;display:flex;flex-direction:column;justify-content:center;align-items:center;pointer-events:auto;z-index:10}h1{font-size:48px;color:#f44;text-shadow:4px 4px 0 #000;margin-bottom:20px}button{padding:15px 30px;font-size:24px;background-color:#444;color:#fff;border:2px solid #fff;cursor:pointer;transition:background-color .2s}button:hover{background-color:#666}#upgrade-options{display:flex;gap:20px}.upgrade-card{border:2px solid gold;padding:20px;width:200px;text-align:center;cursor:pointer}#character-select-screen{position:absolute;top:0;left:0;width:100%;height:100%;background-color:#111;display:flex;flex-direction:column;justify-content:center;align-items:center;z-index:20;pointer-events:auto}.character-card.selected,.upgrade-card.selected{border-color:#fff;box-shadow:0 0 20px #ffffff80;transform:scale(1.05)}#character-options{display:flex;gap:20px}.character-card{background-color:#222;border:2px solid #555;padding:20px;width:200px;text-align:center;cursor:pointer;transition:transform .2s,border-color .2s}.character-card:hover{transform:scale(1.05);border-color:#fff}.character-name{font-size:24px;font-weight:700;margin-bottom:10px}.character-desc{font-size:14px;color:#aaa}#perf-overlay{position:fixed;bottom:20px;right:20px;background:#000000d9;border:1px solid rgba(255,255,255,.2);border-radius:8px;padding:12px 16px;font-family:Consolas,Monaco,monospace;font-size:12px;color:#e0e0e0;z-index:100;min-width:160px;pointer-events:none;backdrop-filter:blur(4px)}#perf-stats{display:flex;flex-direction:column;gap:4px}.perf-section{display:flex;gap:6px;align-items:baseline}.perf-label{color:#888;min-width:70px}.perf-value{color:#4ade80;font-weight:700}.perf-value.perf-warn{color:#f87171}.perf-value.perf-caution{color:#fbbf24}.perf-value.perf-critical{color:#f44;animation:pulse .5s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.perf-header{color:#a0a0a0;font-size:10px;font-weight:700;margin-top:4px;margin-bottom:2px;letter-spacing:.5px}.perf-sub{color:#666;font-size:10px}.perf-divider{height:1px;background:#ffffff1a;margin:6px 0}.perf-indent{padding-left:12px}.perf-indent .perf-label{min-width:80px;color:#666}.perf-hint{margin-top:8px;color:#555;font-size:10px;text-align:center}@media(max-width:768px){#character-options{flex-wrap:wrap;justify-content:center;gap:10px;padding:10px}.character-card{width:140px;padding:15px}.character-name{font-size:18px}.character-desc{font-size:12px}#upgrade-options{flex-wrap:wrap;justify-content:center;gap:10px;padding:10px}.upgrade-card{width:140px;padding:15px}button{padding:20px 40px;font-size:20px;min-width:200px}#hud{padding:5px}#stats{font-size:14px}h1{font-size:32px}}@media(pointer:coarse){*{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent}button,.character-card,.upgrade-card{cursor:pointer}}#rotate-device{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:#111;z-index:9999;justify-content:center;align-items:center;pointer-events:auto}.rotate-content{text-align:center;color:#fff}.rotate-icon{font-size:80px;margin-bottom:20px;animation:rotate-hint 2s ease-in-out infinite}.rotate-content p{font-size:24px;max-width:300px;line-height:1.4}@keyframes rotate-hint{0%,to{transform:rotate(0)}25%{transform:rotate(-15deg)}75%{transform:rotate(15deg)}}@media(pointer:coarse)and (orientation:portrait){#rotate-device{display:flex}}