/* Base reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background: #0d1022;
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 100vh;
  padding: 20px;
}

/* Top bar */
.topbar {
  width: 100%;
  max-width: 500px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  padding: 10px 15px;
  background: #1c1f38;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.topbar h1 {
  font-size: 20px;
  color: #8ab4ff;
}

.score-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.scoreboard {
  font-size: 16px;
  font-weight: bold;
}

/* Buttons */
.btn {
  padding: 8px 16px;
  font-size: 15px;
  font-weight: bold;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: linear-gradient(90deg, #93c5fd, #6ee7b7);
  color: #0d1022;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.btn.small {
  padding: 6px 12px;
  font-size: 14px;
  border-radius: 6px;
}

.btn:hover {
  transform: scale(1.05);
  opacity: 0.9;
}

/* Smaller size for specific buttons: pause, restart, mute */
#pauseResumeBtn, #restartBtn, #muteBtn {
  padding: 4px 8px;
  font-size: 12px;
  border-radius: 4px;
}

/* Canvas */
main {
  display: flex;
  justify-content: center;
  align-items: center;
}

canvas {
  border: 3px solid #8ab4ff;
  border-radius: 10px;
  background: #0d1022;
  box-shadow: 0 6px 18px rgba(0,0,0,0.4);
}

/* Overlay */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(13,16,34,0.9);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10;
}

.overlay.hidden {
  display: none;
}

.overlay-content {
  background: #1c1f38;
  padding: 30px 40px;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 6px 18px rgba(0,0,0,0.4);
}

.overlay-content h2 {
  font-size: 28px;
  margin-bottom: 15px;
  color: #ff7676;
}

.overlay-content p {
  font-size: 18px;
  margin-bottom: 20px;
}

/* Mobile Controls */
.mobile-controls {
  display: none;
  margin-top: 20px;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.mobile-controls button {
  background: #8ab4ff;
  border: none;
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 24px;
  cursor: pointer;
}

.mobile-controls .middle-row {
  display: flex;
  gap: 15px;
}

/* Responsive */
@media (max-width: 600px) {
  canvas {
    width: 300px;
    height: 300px;
  }

  .topbar {
    flex-direction: column;
    gap: 10px;
  }

  .mobile-controls {
    display: flex;
  }
}