@import url('https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,400;9..40,500;9..40,600&family=JetBrains+Mono:wght@400;500&display=swap');

*, *::before, *::after { box-sizing: border-box; }

.hidden { display: none !important; }

:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --surface-elevated: #242424;
  --surface-hover: #2a2a2a;
  --text: #e8e8e8;
  --text-muted: #888;
  --accent: #c9a86c;
  --accent-dim: rgba(201, 168, 108, 0.15);
  --square-light: #e8e0d5;
  --square-dark: #7d6b5a;
  --square-hover: rgba(201, 168, 108, 0.25);
  --square-selected: rgba(201, 168, 108, 0.4);
  --border: #2a2a2a;
  --white-piece: #f2ede4;
  --black-piece: #1a1a1a;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem;
}

/* ---- Layout ---- */
#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  max-width: 900px;
  width: 100%;
}

.app-header {
  text-align: center;
  margin-bottom: 0.5rem;
}

.app-header h1 {
  margin: 0 0 0.25rem 0;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.status {
  font-size: 0.8125rem;
  color: var(--text-muted);
  min-height: 1.25rem;
  margin: 0;
}

.main-content {
  display: flex;
  gap: 1.5rem;
  width: 100%;
  justify-content: center;
  align-items: stretch;
  flex-wrap: wrap;
}

.board-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

/* Same height as board (484px), original width */
.timeline-section {
  flex: 0 0 220px;
  min-width: 200px;
  height: 484px;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.panel-title {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 0.75rem 0;
}

/* ---- Board ---- */
.board-wrap {
  background: var(--surface-elevated);
  padding: 1.25rem;
  border-radius: 6px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.board {
  display: grid;
  grid-template-columns: 28px repeat(8, 52px);
  grid-template-rows: 28px repeat(8, 52px);
  width: min-content;
}

.board-label {
  font-size: 0.6875rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
}

.square {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 38px;
  cursor: pointer;
  user-select: none;
  transition: background 0.12s ease;
  color: var(--white-piece);
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.5),
               0 -1px 1px rgba(0, 0, 0, 0.3),
               1px 0 1px rgba(0, 0, 0, 0.3),
               -1px 0 1px rgba(0, 0, 0, 0.3),
               1px 1px 1px rgba(0, 0, 0, 0.3),
               -1px -1px 1px rgba(0, 0, 0, 0.3);
}

.square.piece-black {
  color: var(--black-piece);
  text-shadow: 0 0 1px rgba(255, 255, 255, 0.25),
               0 1px 1px rgba(255, 255, 255, 0.15);
}

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

.square.light:hover,
.square.dark:hover {
  filter: brightness(0.95);
}

.square.selected {
  background: var(--square-selected) !important;
  box-shadow: inset 0 0 0 2px rgba(201, 168, 108, 0.6);
}

/* ---- Timeline ---- */
.timeline {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

/* Slim scrollbar for WebKit (Chrome, Safari) */
.timeline::-webkit-scrollbar {
  width: 6px;
}

.timeline::-webkit-scrollbar-track {
  background: transparent;
}

.timeline::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.timeline::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.timeline-empty {
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-style: italic;
  padding: 0.5rem 0;
}

.timeline-moves {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.timeline-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
}

.timeline-move-num {
  flex: 0 0 1.5rem;
  color: var(--text-muted);
  font-weight: 500;
}

.timeline-move {
  flex: 1;
  display: flex;
  gap: 0.375rem;
  flex-wrap: wrap;
}

.timeline-chip {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(201, 168, 108, 0.3);
}

.timeline-chip.white {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border-color: var(--border);
}

.timeline-chip.black {
  background: rgba(0, 0, 0, 0.3);
  color: var(--text-muted);
  border-color: var(--border);
}

/* ---- Controls ---- */
.controls-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
}

.player-selects {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
  max-width: 240px;
}

.player-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.player-row label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  min-width: 48px;
}

.btn {
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
  border: 1px solid;
}

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

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--surface-elevated);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: var(--text-muted);
}

#setup select {
  flex: 1;
  padding: 0.5rem 0.75rem;
  background: var(--surface-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  font-family: inherit;
}

#setup select:focus {
  outline: none;
  border-color: var(--text-muted);
}

.setup-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border);
}

.btn-ghost:hover {
  background: var(--surface-elevated);
  color: var(--text);
}

.btn-ghost.active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: rgba(201, 168, 108, 0.5);
}

.btn-small {
  padding: 0.35rem 0.6rem;
  font-size: 0.75rem;
}

.piece-palette,
.turn-setup {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.palette-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-right: 0.25rem;
}

.piece-btn {
  width: 32px;
  height: 32px;
  padding: 0;
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.12s ease;
  color: var(--white-piece);
}

.piece-btn.piece-black {
  color: var(--black-piece);
}

.piece-btn:hover {
  border-color: var(--text-muted);
  filter: brightness(1.1);
}

.piece-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(201, 168, 108, 0.5);
}

.square.setup-clickable {
  cursor: pointer;
}

.square.setup-clickable:hover {
  box-shadow: inset 0 0 0 2px var(--accent);
}

.game-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.autoplay-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.autoplay-toggle input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.autoplay-toggle .toggle-track {
  display: flex;
  align-items: center;
  width: 36px;
  height: 20px;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2px;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.autoplay-toggle .toggle-thumb {
  width: 14px;
  height: 14px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: transform 0.2s ease, background 0.2s ease;
}

.autoplay-toggle input:checked + .toggle-track {
  background: var(--accent-dim);
  border-color: rgba(201, 168, 108, 0.5);
}

.autoplay-toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(18px);
  background: var(--accent);
}

.autoplay-toggle:hover .toggle-track {
  border-color: var(--text-muted);
}

.autoplay-toggle .toggle-label {
  color: var(--text-muted);
}