.simulation-container {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  overflow: hidden;
  position: relative;
  background-color: #000;
}

#fluid-canvas {
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  cursor: crosshair;
}

#controls-panel {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 320px;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-xl);
  z-index: 10;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  color: #f1f5f9;
}

#controls-panel.collapsed {
  transform: translateX(120%);
}

.control-group {
  margin-bottom: 1.2rem;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #94a3b8;
}

.mode-toggles {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mode-btn {
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.5rem;
  border-radius: 6px;
  color: #cbd5e1;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
  font-size: 0.9rem;
}

.mode-btn:hover {
  background: rgba(30, 41, 59, 0.8);
}

.mode-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

#val-dissipation, #val-viscosity {
  color: var(--color-primary);
}

#toggle-ui {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 5;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

@media (max-width: 768px) {
  #controls-panel {
    top: auto;
    bottom: 20px;
    right: 50%;
    transform: translateX(50%);
    width: 90vw;
    max-height: 40vh;
    overflow-y: auto;
  }
  #controls-panel.collapsed {
    transform: translate(50%, 120%);
  }
  #toggle-ui {
    top: auto;
    bottom: 20px;
    right: 20px;
  }
}