:root {
  --bg-primary: #18191c;
  --bg-secondary: #222429;
  --bg-tertiary: #2a2d34;
  --text-primary: #f0f2f5;
  --text-secondary: #9ea5b3;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --danger-color: #ef4444;
  --success-color: #10b981;
  --border-color: #333842;
  --border-radius: 8px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-layout {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  font-size: 1.75rem;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--accent-color);
  color: white;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #6b7280;
}

.dot.loading {
  background-color: #f59e0b;
  animation: pulse 1.5s infinite;
}

.dot.ready {
  background-color: var(--success-color);
}

.dot.error {
  background-color: var(--danger-color);
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.main-content {
  display: grid;
  grid-template-columns: minmax(320px, 600px) 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 850px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}

.board-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
}

#board {
  width: min(600px, 85vw);
  height: min(600px, 85vw);
  border-radius: 4px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.panel {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.25rem;
}

.panel-title {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

/* Eval panel */
.eval-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.eval-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.eval-bar-bg {
  width: 100%;
  height: 8px;
  background-color: #333;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.eval-bar-fill {
  background: linear-gradient(90deg, #ef4444, #10b981);
  transition: width 0.3s ease;
}

.engine-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.pv-line {
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Controls */
.control-group {
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

select, input[type="range"] {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.5rem;
  font-size: 0.9rem;
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.btn {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.6rem 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

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

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

.btn-accent {
  background-color: #8b5cf6;
  border-color: #8b5cf6;
}

.btn-accent:hover {
  background-color: #7c3aed;
}

/* Move history */
.move-list {
  max-height: 120px;
  overflow-y: auto;
  font-family: monospace;
  font-size: 0.85rem;
  display: grid;
  grid-template-columns: 40px 1fr 1fr;
  gap: 0.25rem 0.5rem;
  color: var(--text-secondary);
}

/* Console logs */
.uci-panel summary {
  cursor: pointer;
  user-select: none;
}

.console-log {
  margin-top: 0.5rem;
  max-height: 140px;
  overflow-y: auto;
  background-color: #111;
  padding: 0.5rem;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.75rem;
  color: #a3e635;
  white-space: pre-wrap;
  word-break: break-all;
}