:root {
          --bg: #0f0f0f;
          --surface: #1a1a1a;
          --border: #2a2a2a;
          --light-sq: #f0d9b5;
          --dark-sq: #b58863;
          --highlight: #cdd26a;
          --highlight-move: #aaa23a;
          --check: #ff4444;
          --text: #e8e0d0;
          --text-muted: #7a7060;
          --accent: #c9a84c;
        }

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 28px;
}

header h1 {
  font-family: 'Playfair Display', serif;
  font-size: 2.2rem;
  color: var(--accent);
  letter-spacing: 0.02em;
}

header p {
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-top: 4px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.game-wrapper {
  display: flex;
  gap: 28px;
  align-items: flex-start;
}

/* Board */
.board-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.board-container {
  position: relative;
}

.move-log-panel {
  width: 662px;
  max-width: 662px;
}

.board-with-coords {
  display: flex;
  align-items: center;
  gap: 6px;
}

.coords-col {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  height: 640px;
  padding: 4px 0;
}

.coords-row {
  display: flex;
  justify-content: space-around;
  width: 640px;
  margin-top: 6px;
  margin-left: 0;
}

.coord {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  width: 14px;
  text-align: center;
}

#board {
  display: grid;
  grid-template-columns: repeat(8, 80px);
  grid-template-rows: repeat(8, 80px);
  border: 2px solid var(--border);
  box-shadow: 0 0 40px rgba(0,0,0,0.6), 0 0 0 1px rgba(201,168,76,0.15);
  cursor: pointer;
}

.square {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: filter 0.1s;
}

.square.light { background: var(--light-sq); }
.square.dark  { background: var(--dark-sq); }

.square.selected {
  background: var(--highlight) !important;
}

.square.valid-target::after {
  content: '';
  position: absolute;
  width: 28%;
  height: 28%;
  border-radius: 50%;
  background: rgba(0,0,0,0.2);
}

.square.valid-capture::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: inset 0 0 0 5px rgba(0,0,0,0.2);
}

.square.last-move {
  background: var(--highlight-move) !important;
}

.square.in-check {
  background: var(--check) !important;
}

.piece {
  width: 72px;
  height: 72px;
  user-select: none;
  pointer-events: none;
  filter: drop-shadow(1px 2px 2px rgba(0,0,0,0.4));
  transition: transform 0.1s;
}

/* Sidebar */
.sidebar {
  width: 240px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 16px;
}

.panel h3 {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s infinite;
}

.dot.thinking {
  background: #4a9eff;
  animation: pulse-fast 0.8s infinite;
}

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

@keyframes pulse-fast {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.3); }
}

.btn {
  width: 100%;
  padding: 10px 14px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.15s;
  text-align: left;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(201,168,76,0.05);
}

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

.btn.primary:hover {
  background: rgba(201,168,76,0.12);
}

.btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.move-log {
  max-height: 200px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.move-log::-webkit-scrollbar { width: 3px; }
.move-log::-webkit-scrollbar-thumb { background: var(--border); }

.move-entry {
  font-size: 0.7rem;
  color: var(--text-muted);
  padding: 2px 0;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  display: flex;
  gap: 8px;
}

.move-entry .move-num { color: var(--accent); min-width: 24px; }

.game-over-banner {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.75);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.game-over-banner.visible {
  opacity: 1;
  pointer-events: all;
}

.game-over-banner h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.8rem;
  color: var(--accent);
}

.game-over-banner p {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.loading-overlay.visible {
  opacity: 1;
  pointer-events: all;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.mode-select {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mode-btn {
  padding: 8px 12px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.15s;
  text-align: left;
}

.mode-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(201,168,76,0.08);
}

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

/* Setup page styles */
.setup-container {
  max-width: 500px;
  margin: 0 auto;
}

.setup-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 24px;
  margin-bottom: 20px;
}

.setup-panel h2 {
  font-family: 'Playfair Display', serif;
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 20px;
  text-align: center;
}

.setup-panel h3 {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 12px;
  margin-top: 20px;
}

.setup-panel h3:first-of-type {
  margin-top: 0;
}

.start-btn {
  width: 100%;
  padding: 16px 20px;
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.15s;
  margin-top: 24px;
  font-weight: 400;
}

.start-btn:hover {
  background: rgba(201,168,76,0.12);
  transform: translateY(-1px);
}

.chess-icon {
  font-size: 4rem;
  text-align: center;
  margin-bottom: 20px;
  opacity: 0.8;
}

/* Chess Clock Styles */
.chess-clocks {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  width: 662px;
}

.clock-container {
  flex: 1;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 4px;
  padding: 12px 16px;
  text-align: center;
  transition: all 0.3s ease;
}

.clock-container.active {
  border-color: var(--accent);
  background: rgba(201,168,76,0.05);
  box-shadow: 0 0 12px rgba(201,168,76,0.2);
}

.clock-container.time-low {
  border-color: #ff4444;
  background: rgba(255,68,68,0.05);
  animation: pulse-warning 1s infinite;
}

@keyframes pulse-warning {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.clock-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.clock-time {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.8rem;
  font-weight: 400;
  color: var(--text);
  letter-spacing: 0.05em;
}

.clock-container.active .clock-time {
  color: var(--accent);
}

.clock-container.time-low .clock-time {
  color: #ff4444;
}