:root {
  --c: #00d4ff;
}

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

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

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

.controls-overlay {
  position: fixed;
  inset: 0;
  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(2, 4, 14, 0.96);
  border: 2px solid var(--c);
  border-radius: 10px;
  padding: 40px;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 0 50px color-mix(in srgb, var(--c) 45%, transparent);
}

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

.panel-header h1 {
  font-size: 2.4rem;
  color: var(--c);
  text-shadow: 0 0 20px color-mix(in srgb, var(--c) 70%, transparent);
  letter-spacing: 4px;
  margin-bottom: 10px;
}

.subtitle { font-size: 1rem; color: color-mix(in srgb, var(--c) 75%, #888); letter-spacing: 2px; }

.control-group { margin-bottom: 22px; }

.control-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--c);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.control-group input[type="range"] {
  width: calc(100% - 60px);
  height: 6px;
  background: color-mix(in srgb, var(--c) 20%, transparent);
  border: 1px solid var(--c);
  border-radius: 3px;
  outline: none;
  -webkit-appearance: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px;
  background: var(--c);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 10px color-mix(in srgb, var(--c) 70%, transparent);
}

.control-group input[type="range"]::-moz-range-thumb {
  width: 18px; height: 18px;
  background: var(--c);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.control-group span {
  display: inline-block;
  width: 50px;
  text-align: center;
  color: var(--c);
  font-weight: bold;
  margin-left: 10px;
}

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

.control-group select option { background: #000; color: var(--c); }

.button-group { display: flex; gap: 10px; margin: 28px 0 20px; }

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

.btn-primary {
  background: var(--c);
  color: #000;
  box-shadow: 0 0 20px color-mix(in srgb, var(--c) 45%, transparent);
}

.btn-primary:hover { filter: brightness(1.1); transform: translateY(-2px); }
.btn-secondary { background: transparent; color: var(--c); }
.btn-secondary:hover { background: color-mix(in srgb, var(--c) 12%, transparent); }
.btn.hidden { display: none; }

.info-text {
  margin-top: 16px;
  padding: 15px;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid color-mix(in srgb, var(--c) 50%, transparent);
  border-radius: 5px;
  text-align: center;
}

.info-text p { font-size: 0.85rem; color: color-mix(in srgb, var(--c) 75%, #888); margin: 5px 0; }
.info-text strong { color: var(--c); }

.back-link {
  display: block;
  text-align: center;
  margin-top: 20px;
  color: color-mix(in srgb, var(--c) 75%, #888);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

.back-link:hover { color: var(--c); }

@media (max-width: 600px) {
  .controls-panel { padding: 30px 20px; }
  .panel-header h1 { font-size: 1.8rem; }
  .button-group { flex-direction: column; }
}