* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; background: #000;
             font-family: 'Courier New', monospace;
             touch-action: none; user-select: none; }
canvas { image-rendering: pixelated; image-rendering: crisp-edges; display: block;
         position: fixed; top: 0; }
#startscreen {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.72); color: #fff; z-index: 10;
}
#startscreen h1 {
  font-size: clamp(28px, 8vw, 54px); color: #FFD700; letter-spacing: clamp(3px, 1.5vw, 8px);
  text-shadow: 4px 4px 0 #c00, 7px 7px 0 #700; margin-bottom: 10px;
  text-align: center;
}
#startscreen .sub  { font-size: clamp(11px, 2.5vw, 15px); color: #aaa;
                     letter-spacing: 4px; margin-bottom: 28px; text-align: center; }
#startscreen .ctrl { font-size: clamp(11px, 2.2vw, 13px); color: #888;
                     line-height: 2.1; text-align: center; padding: 0 16px; }
.blink { animation: blink 1s step-end infinite; font-size: clamp(14px, 4vw, 22px);
         color: #FFD700; margin-top: 26px; letter-spacing: 2px; text-align: center; }
@keyframes blink { 50% { opacity: 0; } }