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

:root {
  --accent: #818cf8;
  --accent-dim: rgba(129, 140, 248, 0.2);
}

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&display=swap');

body {
  font-family: 'Space Grotesk', sans-serif;
  background: #000;
  color: #fff;
  min-height: 100vh;
  overflow: hidden;
}

#starfield {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.back-btn {
  position: fixed;
  top: 1rem;
  left: 1rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  z-index: 1000;
  transition: all 0.3s ease;
}

.back-btn svg { width: 18px; height: 18px; }

.back-btn:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
  transform: scale(1.1);
}

.overlay {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  pointer-events: none;
  z-index: 10;
  opacity: 0.8;
  transition: opacity 0.5s ease;
}

body:hover .overlay {
  opacity: 0.3;
}

.title {
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 40px rgba(129, 140, 248, 0.5);
  margin-bottom: 0.5rem;
}

.subtitle {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
}

.controls {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 2rem;
  z-index: 100;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
  padding: 1rem 2rem;
  border-radius: 50px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.control-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.control-label {
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.slider {
  -webkit-appearance: none;
  width: 80px;
  height: 4px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.1);
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.footer {
  position: fixed;
  bottom: 0.5rem;
  right: 1rem;
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.3);
  z-index: 100;
}

.footer a {
  color: var(--accent);
  text-decoration: none;
}

@media (max-width: 600px) {
  .controls {
    gap: 1rem;
    padding: 0.75rem 1.5rem;
  }
  .slider { width: 60px; }
}