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

:root {
  --bg: #0a0a0f;
  --bg-card: rgba(255, 255, 255, 0.03);
  --border: rgba(255, 255, 255, 0.08);
  --text: #fff;
  --text-dim: rgba(255, 255, 255, 0.5);
  --accent: #00ff88;
  --accent-dim: rgba(0, 255, 136, 0.2);
  --cell-alive: #00ff88;
  --cell-dead: rgba(255, 255, 255, 0.03);
  --grid-line: rgba(255, 255, 255, 0.05);
}

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

body {
  font-family: 'Space Grotesk', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Back Button */
.back-btn {
  position: fixed;
  top: 1rem;
  left: 1rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  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);
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.3);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 1rem;
}

.title {
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25rem;
}

.subtitle {
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Canvas */
.canvas-wrapper {
  position: relative;
  margin-bottom: 1rem;
}

#gameCanvas {
  display: block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: crosshair;
  box-shadow:
    0 0 60px rgba(0, 255, 136, 0.1),
    inset 0 0 60px rgba(0, 0, 0, 0.5);
}

.generation-counter {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
}

/* Controls */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  margin-bottom: 1rem;
  width: 100%;
  max-width: 900px;
}

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

.control-group.stacked {
  flex-direction: column;
}

.control-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Buttons */
.btn {
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 6px;
}

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

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

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
  min-width: 50px;
}

.btn-primary:hover {
  background: #00cc6e;
  border-color: #00cc6e;
  color: #000;
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.4);
}

.btn-primary .icon-pause {
  display: none;
}

.btn-primary.playing .icon-play {
  display: none;
}

.btn-primary.playing .icon-pause {
  display: block;
}

.btn-small {
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
}

.btn-small.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
  box-shadow: 0 0 15px rgba(0, 255, 136, 0.4);
}

.pattern-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

/* Slider */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 120px;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 15px var(--accent);
}

.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.slider-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent);
}

/* Select */
.select {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  outline: none;
  transition: all 0.2s ease;
}

.select:hover, .select:focus {
  border-color: var(--accent);
}

.select option {
  background: var(--bg);
  color: var(--text);
}

/* Info */
.info {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  margin-bottom: 0.5rem;
}

.info strong {
  color: var(--accent);
  font-weight: 500;
}

/* Footer */
.footer {
  margin-top: auto;
  padding-top: 0.5rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.75rem;
}

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

.footer a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0.75rem;
  }

  .back-btn {
    top: 0.5rem;
    left: 0.5rem;
    width: 36px;
    height: 36px;
  }

  .controls {
    gap: 0.75rem;
  }

  .control-group {
    flex-wrap: wrap;
    justify-content: center;
  }

  .btn {
    padding: 0.5rem 0.75rem;
  }

  .slider {
    width: 80px;
  }
}

@media (max-width: 480px) {
  .title {
    font-size: 1.5rem;
  }

  .btn-small {
    padding: 0.35rem 0.5rem;
    font-size: 0.7rem;
  }

  .control-label {
    font-size: 0.65rem;
  }
}

/* Cell glow effect */
@keyframes cellGlow {
  0%, 100% { box-shadow: 0 0 5px var(--accent); }
  50% { box-shadow: 0 0 15px var(--accent); }
}