* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: #000; color: #fff; overflow: hidden; font-family: monospace; }
canvas { display: block; width: 100%; height: 100vh; }
#ui-root { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 10; }
#hud { width: 100%; height: 100%; }
#crosshair { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); font-size: 24px; color: rgba(255,255,255,0.8); text-shadow: 0 0 2px #000; }
#health-bar { position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%); width: 200px; height: 8px; background: rgba(0,0,0,0.6); border: 1px solid rgba(255,255,255,0.3); }
#health-fill { height: 100%; width: 100%; background: #0f0; transition: width 0.2s, background-color 0.2s; }
#health-text { position: absolute; top: -20px; left: 50%; transform: translateX(-50%); font-size: 14px; color: #fff; text-shadow: 0 0 4px #000; }
#info { position: absolute; top: 10px; left: 10px; font-size: 13px; line-height: 1.6; color: #0f0; text-shadow: 0 0 2px #000; }
#click-prompt { position: absolute; top: 50%; left: 50%; transform: translate(-50%, 30px); font-size: 18px; color: rgba(255,255,255,0.7); text-shadow: 0 0 4px #000; z-index: 20; }