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

body {
  font-family: 'Courier Prime', 'Courier New', monospace;
  background: #000;
  color: #0f0;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

#matrixCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* Controls Overlay */
.controls-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity 0.3s ease;
}

.controls-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.controls-panel {
  background: rgba(0, 20, 0, 0.95);
  border: 2px solid #0f0;
  border-radius: 10px;
  padding: 40px;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 0 50px rgba(0, 255, 0, 0.5);
}

.panel-header {
  text-align: center;
  margin-bottom: 30px;
}

.panel-header h1 {
  font-size: 2.5rem;
  color: #0f0;
  text-shadow: 0 0 20px rgba(0, 255, 0, 0.8);
  letter-spacing: 5px;
  margin-bottom: 10px;
}

.subtitle {
  font-size: 1rem;
  color: #0a0;
  letter-spacing: 2px;
}

.control-group {
  margin-bottom: 25px;
}

.control-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: #0f0;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.control-group input[type="range"] {
  width: calc(100% - 60px);
  height: 6px;
  background: rgba(0, 255, 0, 0.2);
  border: 1px solid #0f0;
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: #0f0;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.8);
}

.control-group input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: #0f0;
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.8);
}

.control-group span {
  display: inline-block;
  width: 50px;
  text-align: center;
  color: #0f0;
  font-weight: bold;
  margin-left: 10px;
}

.control-group select {
  width: 100%;
  padding: 10px;
  background: rgba(0, 0, 0, 0.8);
  border: 1px solid #0f0;
  border-radius: 5px;
  color: #0f0;
  font-family: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  outline: none;
}

.control-group select option {
  background: #000;
  color: #0f0;
}

.button-group {
  display: flex;
  gap: 10px;
  margin: 30px 0 20px;
}

.btn {
  flex: 1;
  padding: 12px 20px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: bold;
  letter-spacing: 1px;
  border: 2px solid #0f0;
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
}

.btn-primary {
  background: #0f0;
  color: #000;
  box-shadow: 0 0 20px rgba(0, 255, 0, 0.5);
}

.btn-primary:hover {
  background: #0d0;
  box-shadow: 0 0 30px rgba(0, 255, 0, 0.8);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: #0f0;
}

.btn-secondary:hover {
  background: rgba(0, 255, 0, 0.1);
  box-shadow: 0 0 20px rgba(0, 255, 0, 0.3);
}

.btn.hidden {
  display: none;
}

.info-text {
  margin-top: 20px;
  padding: 15px;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid #0a0;
  border-radius: 5px;
  text-align: center;
}

.info-text p {
  font-size: 0.85rem;
  color: #0a0;
  margin: 5px 0;
}

.info-text strong {
  color: #0f0;
}

.back-link {
  display: block;
  text-align: center;
  margin-top: 20px;
  color: #0a0;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

.back-link:hover {
  color: #0f0;
  text-shadow: 0 0 10px rgba(0, 255, 0, 0.5);
}

/* Responsive */
@media (max-width: 600px) {
  .controls-panel {
    padding: 30px 20px;
  }

  .panel-header h1 {
    font-size: 1.8rem;
  }

  .button-group {
    flex-direction: column;
  }
}