body {
  background: #222;
  color: #eee;
  font-family: 'Segoe UI', Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  margin: 0;
}

h1 {
  margin-top: 32px;
  margin-bottom: 16px;
  font-size: 2rem;
  letter-spacing: 1px;
}

#controls-container {
  margin-bottom: 16px;
  padding: 12px 24px;
  background: #333;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  min-width: 300px;
}

#canvas-container {
  position: relative;
  width: 384px;
  height: 384px;
  margin-bottom: 32px;
}

#scene-canvas {
  position: absolute;
  left: 0;
  top: 0;
  width: 384px;
  height: 384px;
  image-rendering: pixelated;
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
  z-index: 1;
}

#flow-canvas {
  position: absolute;
  left: 0;
  top: 0;
  width: 384px;
  height: 384px;
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
  z-index: 2;
  pointer-events: none;
}

#pause-btn {
  background: #444;
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 8px 20px;
  font-size: 1rem;
  cursor: pointer;
  margin-right: 16px;
}
#pause-btn:hover {
  background: #666;
}

#next-frame-btn {
  background: #444;
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 8px 20px;
  font-size: 1rem;
  cursor: pointer;
  margin-right: 16px;
}
#next-frame-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
#next-frame-btn:hover:enabled {
  background: #666;
}

#previous-frame-btn {
    background: #444;
    color: #fff;
    border: none;
    border-radius: 5px;
    padding: 8px 20px;
    font-size: 1rem;
    cursor: pointer;
    margin-right: 16px;
  }
  #previous-frame-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }
  #previous-frame-btn:hover:enabled {
    background: #666;
  }

#bottom-controls-wrapper {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  justify-content: center;
}

#scene-controls-box, #algo-controls-box {
  background: #333;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  padding: 16px 24px;
  min-width: 280px;
  width: 280px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#scene-controls-box {
  min-width: 280px;
  width: 280px;
}
#algo-controls-box {
  min-width: 280px;
  width: 280px;
}

#scene-controls-box label,
#algo-controls-box label {
  font-size: 1rem;
  color: #ccc;
  margin-bottom: 4px;
}

#scene-controls-box select,
#algo-controls-box select {
  background: #222;
  color: #fff;
  border: 1px solid #555;
  border-radius: 5px;
  padding: 6px 16px;
  font-size: 1rem;
  margin-bottom: 8px;
}

#scene-controls-box input[type="range"],
#algo-controls-box input[type="range"] {
  width: 180px;
  margin-bottom: 8px;
  accent-color: #2196f3;
  vertical-align: middle;
}

.blur-slider-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

#blur-value {
  font-size: 1rem;
  color: #fff;
  margin-left: 0;
  margin-right: 0;
}

#lk-controls, #hs-controls {
  margin-bottom: 8px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

#lk-controls label, #hs-controls label {
  margin-right: 0;
  margin-bottom: 2px;
}

#lk-window-value, #hs-alpha-value, #hs-iter-value {
  font-size: 1rem;
  color: #fff;
  margin-left: 8px;
}