/*
 * Chess Master - mobile stylesheet (Pasons port, see CHANGES.md).
 *
 * Colour tokens are the Electron app's own chess.com-style dark theme,
 * unchanged (client brief: "same colours, same assets"). The layout is
 * mobile-only: board-first column with the moves panel as a bottom-sheet
 * drawer. The desktop split layout and the LLM settings chrome are gone.
 */

:root {
  /* Backgrounds */
  --bg-primary: #312E2B;
  --bg-secondary: #262421;
  --bg-tertiary: #1F1E1B;
  --bg-hover: #3D3B38;

  /* Board (chess.com greens, same as the Electron app) */
  --board-light: #EBECD0;
  --board-dark: #739552;
  --highlight: #F6F669;
  --highlight-opacity: 0.6;
  --move-dot: rgba(0, 0, 0, 0.14);
  --capture-ring: rgba(0, 0, 0, 0.14);
  --check-red: #E53E3E;
  --selected: rgba(255, 255, 255, 0.3);

  /* Text */
  --text-primary: #FFFFFF;
  --text-secondary: #9E9B98;
  --text-muted: #6B6966;

  /* Accents */
  --accent-green: #81B64C;
  --accent-green-hover: #9BC56B;
  --accent-red: #E53E3E;
  --accent-red-hover: #F56565;
  --accent-blue: #4A90D9;
  --accent-gold: #D9A83C;

  --border: #3D3B38;
  --shadow: rgba(0, 0, 0, 0.3);

  --header-height: 52px;
  --board-size: min(calc(100vw - 16px), calc(100dvh - 300px), 520px);
  --square-size: calc(var(--board-size) / 8);
}

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

html, body {
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

.hidden {
  display: none !important;
}

/* ---------------------------------------------------------------- buttons */
.btn {
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}

.btn-primary {
  background: var(--accent-green);
  color: #fff;
}

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

.btn-secondary {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: #4A4845;
}

.btn-danger {
  background: var(--accent-red);
  color: #fff;
}

.btn-danger:hover {
  background: var(--accent-red-hover);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

/* ---------------------------------------------------------------- header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Header "New Game": compact one-line action. Scoped by ID so the full-size
   .btn-primary CTAs inside the modals (Start Game, New Game rematch) keep their
   larger padding. nowrap + flex-shrink:0 stop the label wrapping to two lines
   when the header gets tight (the wrap made the button look oversized). */
#btn-new-game {
  padding: 7px 12px;
  font-size: 13px;
  white-space: nowrap;
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.logo-icon {
  height: 28px;
  width: 28px;
  object-fit: contain;
}

.logo-text {
  font-size: 16px;
  font-weight: 700;
  white-space: nowrap;
}

.mode-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--bg-tertiary);
  border-radius: 14px;
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
}

.mode-indicator-text {
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------------------------------------------------------------- layout */
.main-content {
  display: flex;
  flex-direction: column;
  height: calc(100dvh - var(--header-height));
  overflow: hidden;
}

.board-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 8px 8px 0;
  width: 100%;
}

/* ----------------------------------------------------------- player bars */
.player-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: var(--board-size);
  max-width: 100%;
  padding: 6px 10px;
  background: var(--bg-secondary);
  border-radius: 10px;
}

.player-info {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.player-avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.player-avatar img {
  width: 22px;
  height: 22px;
}

.player-details {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.player-name {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.captured-pieces {
  display: flex;
  align-items: center;
  gap: 1px;
  min-height: 14px;
}

.cap-piece {
  width: 14px;
  height: 14px;
}

.cap-advantage {
  font-size: 11px;
  color: var(--text-secondary);
  margin-left: 4px;
  font-weight: 600;
}

.player-clock {
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  padding: 4px 10px;
  border-radius: 8px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.player-clock.active {
  background: var(--accent-green);
  color: #fff;
}

.player-clock.low-time {
  background: var(--accent-red);
  color: #fff;
}

/* Thinking dots */
.thinking-indicator {
  display: flex;
  gap: 3px;
  align-items: center;
  padding: 0 4px;
}

.thinking-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-gold);
  animation: thinkPulse 1s ease-in-out infinite;
}

.thinking-dot:nth-child(2) { animation-delay: 0.15s; }
.thinking-dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes thinkPulse {
  0%, 100% { opacity: 0.3; transform: scale(0.85); }
  50% { opacity: 1; transform: scale(1); }
}

/* ----------------------------------------------------------------- board */
.board-container {
  display: flex;
  justify-content: center;
  width: 100%;
}

.board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: var(--board-size);
  height: var(--board-size);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 8px 24px var(--shadow);
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.board.locked .square {
  pointer-events: none;
}

.square {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

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

.square.last-move::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--highlight);
  opacity: var(--highlight-opacity);
  pointer-events: none;
}

.square.check {
  background: radial-gradient(circle, var(--check-red) 0%, var(--check-red) 25%, transparent 85%) !important;
}

.piece {
  width: 88%;
  height: 88%;
  object-fit: contain;
  cursor: grab;
  position: relative;
  z-index: 1;
}

.piece-white { filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.35)); }
.piece-black { filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.45)); }

.move-dot {
  position: absolute;
  width: 30%;
  height: 30%;
  background: var(--move-dot);
  border-radius: 50%;
  pointer-events: none;
  z-index: 2;
}

.capture-ring {
  position: absolute;
  inset: 4%;
  border: 4px solid var(--capture-ring);
  border-radius: 50%;
  pointer-events: none;
  z-index: 2;
}

.coordinate {
  position: absolute;
  font-size: calc(var(--square-size) * 0.19);
  font-weight: 700;
  opacity: 0.75;
  pointer-events: none;
}

.coord-rank {
  top: 2px;
  left: 3px;
}

.coord-file {
  bottom: 1px;
  right: 3px;
}

.square-light .coordinate { color: var(--board-dark); }
.square-dark .coordinate { color: var(--board-light); }

/* ------------------------------------------------------------- controls */
.game-controls {
  display: flex;
  gap: 8px;
  width: var(--board-size);
  max-width: 100%;
  justify-content: center;
  padding: 2px 0;
}

.btn-control {
  width: 44px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 18px;
  padding: 0;
}

.btn-control:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-control.btn-danger {
  color: var(--accent-red);
  border-color: rgba(229, 62, 62, 0.35);
}

/* ------------------------------------------------------------ status bar */
.game-status {
  display: flex;
  align-items: center;
  gap: 8px;
  width: var(--board-size);
  max-width: 100%;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

.game-status #status-text {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot.white-dot { background: var(--board-light); border: 1px solid var(--border); }
.status-dot.black-dot { background: var(--bg-tertiary); border: 1px solid var(--border); }

/* Games Zone score chip: #chess--score is also the shell bridge element */
.score-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.score-chip #chess--score {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-gold);
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------- sidebar */
/* Mobile: bottom-sheet drawer opened by the floating button. */
.sidebar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-radius: 16px 16px 0 0;
  max-height: 52dvh;
  display: flex;
  flex-direction: column;
  transform: translateY(110%);
  transition: transform 0.25s ease;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

body.mobile-panel-open .sidebar {
  transform: translateY(0);
}

.sidebar-tabs {
  display: flex;
  gap: 4px;
  padding: 10px 12px 6px;
  border-bottom: 1px solid var(--border);
}

.tab {
  flex: 1;
  padding: 8px;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.tab.active {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.tab-content {
  display: none;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 10px 12px;
}

.tab-content.active {
  display: block;
}

/* Moves list */
.move-list {
  overflow-y: auto;
  max-height: 28dvh;
}

.move-row {
  display: grid;
  grid-template-columns: 36px 1fr 1fr;
  gap: 4px;
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 13px;
  align-items: center;
}

.move-row:nth-child(odd) { background: var(--bg-tertiary); }

.move-number {
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.move-cell {
  padding: 3px 6px;
  border-radius: 5px;
  font-weight: 500;
  text-align: center;
}

.move-cell.latest {
  background: var(--accent-green);
  color: #fff;
}

.move-empty {
  padding: 18px 8px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

/* Info tab */
.game-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  padding: 9px 8px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

.info-label { color: var(--text-secondary); }
.info-value { font-weight: 600; }

/* Stats tab */
.stats-section-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 12px 0 8px;
  font-weight: 700;
}

.stats-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.stat-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 8px;
  text-align: center;
}

.stat-num {
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.stat-win .stat-num { color: var(--accent-green); }
.stat-loss .stat-num { color: var(--accent-red); }
.stat-draw .stat-num { color: var(--accent-gold); }

.history-item {
  display: flex;
  gap: 10px;
  padding: 9px 8px;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}

.history-icon { font-size: 16px; line-height: 1.3; }

.history-title {
  font-size: 13px;
  font-weight: 600;
}

.history-meta {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.hist-win .history-title { color: var(--accent-green); }
.hist-loss .history-title { color: var(--accent-red); }
.hist-draw .history-title { color: var(--accent-gold); }

.btn-clear-history {
  margin: 14px 0 6px;
  width: 100%;
}

/* Mobile drawer chrome */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 80;
}

.drawer-backdrop.hidden {
  display: none;
}

.mobile-moves-toggle {
  position: fixed;
  right: 12px;
  bottom: calc(12px + env(safe-area-inset-bottom, 0px));
  z-index: 95;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 22px;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

.mobile-moves-toggle.open {
  background: var(--accent-green);
  color: #fff;
}

/* ---------------------------------------------------------------- modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}

.modal-overlay.hidden {
  display: none;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px 18px;
  width: min(340px, 100%);
  max-height: calc(100dvh - 32px);
  overflow-y: auto;
  text-align: center;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.5);
}

.modal h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.modal h3 {
  font-size: 16px;
  margin-bottom: 12px;
}

.modal p {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.5;
}

/* Promotion */
.promotion-pieces {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 6px;
}

.promotion-piece {
  width: 62px;
  height: 62px;
  background: var(--board-light);
  border: 2px solid transparent;
  border-radius: 10px;
  font-size: 36px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.promotion-piece:hover {
  border-color: var(--accent-green);
}

.promotion-piece img {
  width: 46px;
  height: 46px;
}

/* Game over */
.gameover-icon {
  font-size: 48px;
  margin-bottom: 10px;
}

.gameover-buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 18px;
}

.gameover-buttons .btn {
  flex: 1;
  max-width: 140px;
}

/* New game / setup */
.newgame-sub {
  margin-bottom: 14px;
}

.option-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 12px 0;
  text-align: left;
}

.option-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  font-weight: 700;
}

.difficulty-selector {
  display: flex;
  gap: 8px;
}

.diff-option {
  flex: 1;
  padding: 12px 0;
  background: var(--bg-tertiary);
  border: 2px solid var(--border);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.diff-option:hover {
  background: var(--bg-hover);
}

.diff-option.active {
  border-color: var(--accent-green);
  background: rgba(129, 182, 76, 0.15);
  color: var(--accent-green);
}

.color-selector {
  display: flex;
  gap: 8px;
}

.color-option {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 6px;
  background: var(--bg-tertiary);
  border: 2px solid var(--border);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.color-option img {
  width: 18px;
  height: 18px;
}

.color-option.active {
  border-color: var(--accent-green);
  color: var(--text-primary);
}

.time-controls {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.time-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 10px 4px;
  background: var(--bg-tertiary);
  border: 2px solid var(--border);
  border-radius: 10px;
  color: var(--text-secondary);
  cursor: pointer;
}

.time-option:hover {
  background: var(--bg-hover);
}

.time-option.active {
  border-color: var(--accent-green);
  color: var(--text-primary);
}

.time-value {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.time-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.newgame-buttons {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.newgame-buttons .btn {
  flex: 1;
}

/* Confirm */
.confirm-buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 16px;
}

.confirm-buttons .btn {
  min-width: 96px;
}

/* Toast (used by ui.js showToast) */
@keyframes fadeIn {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* -------------------------------------------------------- reduced motion */
@media (prefers-reduced-motion: reduce) {
  .sidebar { transition: none; }
  .thinking-dot { animation: none; opacity: 0.8; }
}