body {
  background: radial-gradient(circle at top, #1f3550 0%, #10151d 55%, #080a0f 100%);
  color: #ffffff;
  font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  text-align: center;
  margin: 0;
  padding: 18px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
#game-container {
  background: #202632;
  padding: 22px;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.7);
  border: 1px solid #3c4b62;
  width: min(96vw, 560px);
}
h2 {
  margin: 0 0 10px;
  color: #4db8ff;
  text-shadow: 0 0 10px rgba(77, 184, 255, 0.5);
  letter-spacing: .04em;
}
#hud {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 8px auto 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  color: #d9f7ff;
}
.hud-card {
  background: #0f1724;
  border: 1px solid #314157;
  border-radius: 10px;
  padding: 7px 8px;
}
#message {
  min-height: 38px;
  font-size: clamp(17px, 4vw, 22px);
  font-weight: bold;
  color: #ffca28;
  margin: 10px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}
canvas {
  width: min(100%, 480px);
  height: auto;
  background: #247a4d;
  border: 4px solid #536175;
  border-radius: 14px;
  display: block;
  margin: 14px auto;
  box-shadow: inset 0 0 50px rgba(0,0,0,0.35);
  touch-action: none;
}
.controls {
  margin-top: 16px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
button {
  padding: 12px 22px;
  font-size: 16px;
  font-weight: bold;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 0 rgba(0,0,0,0.3);
}
#pitchBtn { background-color: #007bff; color: white; }
#pitchBtn:hover { background-color: #0069d9; transform: translateY(-2px); }
#swingBtn { background-color: #e63946; color: white; }
#swingBtn:hover { background-color: #d62828; transform: translateY(-2px); }
button:active { transform: translateY(2px); box-shadow: none; }
.legend {
  font-size: 13px;
  color: #c7d3e2;
  margin-top: 16px;
  background: rgba(0,0,0,0.24);
  padding: 10px;
  border-radius: 10px;
  line-height: 1.6;
}