:root {
  --bg-deep: #050505;
  --bg-surface: #0f1115;
  --accent: #10b981; /* Emerald */
  --accent-glow: rgba(16, 185, 129, 0.3);
  --text-primary: #e2e8f0;
  --text-dim: #64748b;
  --border-dim: #1e293b;
  --mono-font: 'JetBrains Mono', 'Fira Code', monospace;
}

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

body {
  background-color: var(--bg-deep);
  color: var(--text-primary);
  font-family: 'Inter', system-ui, sans-serif;
  overflow-x: hidden;
  min-height: 100vh;
}

.grid-bg {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -1;
  mask-image: radial-gradient(circle at center, black, transparent 80%);
}

header {
  padding: 3rem 2rem;
  max-width: 1400px;
  margin: 0 auto;
  border-bottom: 1px solid var(--border-dim);
}

.title-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent-glow);
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
  border-radius: 4px;
  margin-bottom: 1rem;
}

h1 {
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: -2px;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

p.subtitle {
  color: var(--text-dim);
  font-size: 1.1rem;
  max-width: 600px;
}

main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border-dim);
  min-height: calc(100vh - 200px);
}

.panel {
  background: var(--bg-surface);
  padding: 2rem;
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.panel-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.depth-indicator {
  padding: 2px 8px;
  background: #1e293b;
  border-radius: 10px;
  font-size: 10px;
  color: var(--accent);
}

textarea, .output-area {
  flex-grow: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--mono-font);
  font-size: 0.9rem;
  line-height: 1.6;
  resize: none;
  outline: none;
  width: 100%;
}

.output-area {
  overflow-y: auto;
  white-space: pre;
  padding-bottom: 10rem;
}

.controls {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 17, 21, 0.8);
  backdrop-filter: blur(20px);
  padding: 1rem 2rem;
  border: 1px solid var(--border-dim);
  border-radius: 100px;
  display: flex;
  gap: 2rem;
  align-items: center;
  z-index: 100;
  box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

.control-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-dim);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}

.control-item:hover {
  color: var(--accent);
}

input[type="checkbox"] {
  accent-color: var(--accent);
}

.btn-convert {
  background: var(--accent);
  color: #000;
  padding: 0.5rem 1.5rem;
  border-radius: 50px;
  font-weight: 800;
  font-size: 0.8rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-convert:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* Syntax Highlighting */
.hl-key { color: #f87171; }
.hl-type { color: #60a5fa; }
.hl-string { color: #34d399; }
.hl-keyword { color: #c678dd; }
.hl-comment { color: #475569; font-style: italic; }
.hl-recursive { 
  color: #fbbf24; 
  background: rgba(251, 191, 36, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
  border: 1px dashed rgba(251, 191, 36, 0.3);
}
.hl-warning { 
  color: #ef4444; 
  background: rgba(239, 68, 68, 0.15); 
  padding: 4px 8px; 
  border-radius: 4px;
  border-left: 3px solid #ef4444;
}

@keyframes pulse-accent {
  0% { text-shadow: 0 0 5px var(--accent-glow); }
  50% { text-shadow: 0 0 20px var(--accent); }
  100% { text-shadow: 0 0 5px var(--accent-glow); }
}

.depth-high {
  animation: pulse-accent 2s infinite;
  color: var(--accent) !important;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #1e293b; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #334155; }

@media (max-width: 1024px) {
  main { grid-template-columns: 1fr; }
  .controls { width: 90%; flex-wrap: wrap; border-radius: 20px; }
}