* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #08090c; /* negro grisáceo */
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: #f5f5f5;
}

/* Overlay nombre */
#overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at top, rgba(120,120,255,0.25), rgba(0,0,0,0.9));
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

#overlay-inner {
  background: rgba(5,8,16,0.95);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 20px 24px;
  min-width: 260px;
  text-align: center;
  box-shadow: 0 20px 40px rgba(0,0,0,0.6);
}

#overlay-inner h1 {
  font-size: 24px;
  margin-bottom: 8px;
}

#overlay-inner p {
  font-size: 14px;
  margin-bottom: 12px;
  color: #cfd2ff;
}

#overlay-inner input {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.2);
  margin-bottom: 10px;
  background: #050810;
  color: #f5f5f5;
}

#overlay-inner button {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  background: #4f7dff;
  color: #fff;
  font-weight: 600;
  margin-bottom: 8px;
}

#overlay-inner button:hover {
  background: #7f9dff;
}

#overlay-inner .hint {
  font-size: 11px;
  opacity: 0.8;
}

#gameCanvas {
  display: block;
  width: 100vw;
  height: 100vh;
}