:root {
  --bg-primary: #0a0d14;
  --bg-secondary: #121824;
  --bg-tertiary: #1c2436;
  --border-color: #27334d;
  --border-light: #3b4b6e;
  
  --text-main: #f0f4fc;
  --text-muted: #8b9bb4;
  
  --accent-cyan: #00d4ff;
  --accent-cyan-glow: rgba(0, 212, 255, 0.4);
  --accent-green: #10b981;
  --accent-green-glow: rgba(16, 185, 129, 0.3);
  --accent-purple: #8b5cf6;
  --accent-amber: #f59e0b;
  
  --cell-alive: #00f2fe;
  --cell-alive-stroke: #4facfe;
  --grid-line: #172133;
  --grid-bg: #0a0e17;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(10, 13, 20, 0.95);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

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

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--border-color);
  border-top-color: var(--accent-cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 20px;
  box-shadow: 0 0 20px var(--accent-cyan-glow);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-text {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.loading-subtext {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Header */
.app-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-badge {
  background: linear-gradient(135deg, #00d4ff 0%, #0072ff 100%);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  padding: 8px 14px;
  border-radius: 8px;
  letter-spacing: 1px;
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
}

.app-header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.subtitle strong {
  color: var(--accent-cyan);
}

.header-badges {
  display: flex;
  align-items: center;
  gap: 10px;
}

.badge {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid transparent;
  text-decoration: none;
}

.badge-wasm {
  background-color: rgba(101, 79, 240, 0.15);
  color: #a78bfa;
  border-color: rgba(101, 79, 240, 0.35);
}

.badge-go {
  background-color: rgba(0, 168, 232, 0.15);
  color: #38bdf8;
  border-color: rgba(0, 168, 232, 0.35);
}

.badge-link {
  background-color: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border-color: rgba(16, 185, 129, 0.35);
  transition: all 0.2s ease;
}

.badge-link:hover {
  background-color: rgba(16, 185, 129, 0.25);
  border-color: #34d399;
}

/* Main Layout */
.app-main {
  flex: 1;
  padding: 20px 28px;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* Controls Bar */
.controls-bar {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.control-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, #00d4ff 0%, #0072ff 100%);
  color: #fff;
  border-color: #0099ff;
  box-shadow: 0 2px 10px rgba(0, 153, 255, 0.3);
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 14px rgba(0, 153, 255, 0.45);
}

.btn-primary.active {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  border-color: #f59e0b;
  box-shadow: 0 2px 10px rgba(245, 158, 11, 0.35);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--border-color);
  border-color: var(--border-light);
}

.hidden {
  display: none !important;
}

/* Select Inputs */
.select-input {
  background-color: var(--bg-tertiary);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 12px;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s ease;
}

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

/* Slider */
.speed-group {
  min-width: 190px;
}

#speed-label {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  min-width: 50px;
  display: inline-block;
}

.slider-input {
  appearance: none;
  width: 90px;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.slider-input::-webkit-slider-thumb {
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-cyan-glow);
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.stat-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

/* Canvas Area */
.canvas-wrapper {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

#life-canvas {
  background-color: var(--grid-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: crosshair;
  display: block;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.8), 0 4px 20px rgba(0, 0, 0, 0.4);
}

.canvas-footer {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  padding: 0 4px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.hover-info {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

.canvas-hint {
  font-size: 0.75rem;
  opacity: 0.8;
}

/* Rule Inspector Drawer */
.inspector-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(650px, 90vw);
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.7);
  z-index: 500;
  display: flex;
  flex-direction: column;
  transform: translateX(0);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.inspector-drawer.hidden {
  transform: translateX(100%);
  pointer-events: none;
}

.inspector-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.inspector-title {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--accent-cyan);
}

.inspector-title h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.btn-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.btn-close:hover {
  color: var(--text-main);
  background-color: var(--bg-tertiary);
}

.inspector-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.inspector-callout {
  background-color: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 0.84rem;
  line-height: 1.5;
  color: #bcecfc;
}

.inspector-callout ol {
  margin: 10px 0 0 20px;
}

.inspector-callout li {
  margin-bottom: 6px;
}

.inspector-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.rules-status {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  transition: opacity 0.3s ease;
}

.rules-status.success {
  color: #34d399;
}

.rules-status.error {
  color: #f87171;
}

.rule-editor {
  width: 100%;
  min-height: 480px;
  background-color: #080b11;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: #e2e8f0;
  resize: vertical;
  outline: none;
  tab-size: 2;
  white-space: pre;
}

.rule-editor:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.2);
}

@media (max-width: 850px) {
  .controls-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .control-group {
    justify-content: space-between;
  }
}