@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Share+Tech+Mono&display=swap');

:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --panel: #1a1a28;
  --border: #2a2a45;
  --accent: #00ffcc;
  --accent2: #ff3366;
  --accent3: #ffcc00;
  --text: #e0e0ff;
  --dim: #5555aa;
  --glow: 0 0 20px rgba(0,255,204,0.4);
  --glow2: 0 0 20px rgba(255,51,102,0.4);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Share Tech Mono', monospace;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content:'';
  position: fixed;
  inset:0;
  background-image:
    linear-gradient(rgba(0,255,204,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,255,204,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index:0;
}

.wrapper { position:relative; z-index:1; padding:12px; }

h1 {
  font-family: 'Orbitron', monospace;
  font-size: clamp(1.1rem, 3vw, 1.8rem);
  font-weight: 900;
  text-align: center;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 20px rgba(0,255,204,0.5));
}

.subtitle {
  text-align: center;
  color: var(--dim);
  font-size: 0.7rem;
  margin-bottom: 14px;
  letter-spacing: 0.2em;
}

.main-layout {
  display: grid;
  grid-template-columns: 220px 1fr 220px;
  gap: 12px;
  align-items: start;
  max-width: 1100px;
  margin: 0 auto;
}

/* PANELS */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
}

.panel-title {
  font-family: 'Orbitron', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 10px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
  text-transform: uppercase;
}

/* CONTROLS */
.ctrl-group { margin-bottom: 12px; }
.ctrl-label { font-size: 0.65rem; color: var(--dim); margin-bottom: 4px; display:block; }

.toggle-row {
  display: flex;
  background: var(--surface);
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.toggle-btn {
  flex:1; padding: 6px 4px;
  background: transparent;
  border: none;
  color: var(--dim);
  cursor: pointer;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.58rem;
  transition: all 0.2s;
  text-align: center;
}

.toggle-btn.active {
  background: var(--accent);
  color: #000;
  font-weight: bold;
}

.depth-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.depth-control input[type=range] {
  flex:1;
  accent-color: var(--accent);
  cursor: pointer;
}

/* STATS */
.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: 0.65rem;
}
.stat-row:last-child { border-bottom: none; }
.stat-label { color: var(--dim); }
.stat-val {
  font-family: 'Orbitron', monospace;
  color: var(--accent);
  font-size: 0.7rem;
}
.stat-val.red { color: var(--accent2); }
.stat-val.yellow { color: var(--accent3); }

/* NODE BARS */
.node-bar-wrap { margin-top: 8px; }
.node-bar-label {
  font-size: 0.6rem;
  color: var(--dim);
  margin-bottom: 3px;
  display:flex;
  justify-content:space-between;
}
.node-bar-track {
  background: var(--surface);
  border-radius: 4px;
  height: 8px;
  overflow: hidden;
  margin-bottom: 4px;
  border: 1px solid var(--border);
}
.node-bar-fill {
  height:100%;
  border-radius: 4px;
  transition: width 0.4s ease;
}
.bar-minimax { background: linear-gradient(90deg, #ff3366, #ff6644); }
.bar-alphabeta { background: linear-gradient(90deg, #00ffcc, #00ccff); }

/* GAME AREA */
.game-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.status-bar {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 0.7rem;
}

.status-msg {
  font-family: 'Orbitron', monospace;
  font-size: 0.75rem;
  color: var(--accent3);
  letter-spacing: 0.05em;
}

.turn-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.65rem;
  color: var(--dim);
}

.turn-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: var(--glow);
  animation: pulse 1s infinite;
}

@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.4} }

.score-display {
  font-family: 'Orbitron', monospace;
  font-size: 1rem;
  color: var(--accent3);
}

/* CANVAS */
#gameCanvas {
  border: 2px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 0 40px rgba(0,255,204,0.1), inset 0 0 60px rgba(0,0,0,0.5);
  max-width: 100%;
  display: block;
}

#treeCanvas {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  max-width: 100%;
  display:block;
}

/* BUTTONS */
.btn {
  width:100%;
  padding: 8px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  font-family: 'Orbitron', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 6px;
}
.btn:hover {
  background: var(--accent);
  color: #000;
  box-shadow: var(--glow);
}
.btn.danger {
  border-color: var(--accent2);
  color: var(--accent2);
}
.btn.danger:hover {
  background: var(--accent2);
  color: #fff;
  box-shadow: var(--glow2);
}

/* LEGEND */
.legend { font-size:0.6rem; color:var(--dim); line-height:1.8; }
.legend span {
  display:inline-block;
  width:10px; height:10px;
  border-radius:2px;
  margin-right:5px;
  vertical-align:middle;
}

/* OVERLAY */
#overlay {
  position:absolute;
  inset:0;
  background: rgba(0,0,0,0.85);
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  border-radius:8px;
  z-index:10;
}
.overlay-title {
  font-family:'Orbitron',monospace;
  font-size:1.8rem;
  margin-bottom:8px;
}
.overlay-sub {
  font-size:0.75rem;
  color:var(--dim);
  margin-bottom:16px;
}

/* MOBILE CONTROLS */
.mobile-controls {
  display: none;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  width: 160px;
  margin-top: 8px;
}
.d-btn {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 12px;
  font-size: 1.2rem;
  cursor: pointer;
  text-align:center;
  user-select:none;
  transition: background 0.15s;
}
.d-btn:active { background: var(--accent); color:#000; }
.d-btn.center { background: transparent; border-color: transparent; }

/* INFO BOX */
.info-box {
  background: rgba(0,255,204,0.05);
  border: 1px solid rgba(0,255,204,0.2);
  border-radius:6px;
  padding: 8px;
  font-size: 0.6rem;
  color: var(--dim);
  line-height: 1.7;
  margin-top: 8px;
}
.info-box strong { color: var(--accent); }

/* RESPONSIVE */
@media (max-width: 800px) {
  .main-layout { grid-template-columns: 1fr; }
  .mobile-controls { display: grid; }
  .panel { padding: 10px; }
  #gameCanvas { width: 100% !important; height: auto !important; }
}