/* Modern Sleek Chess Web App Stylesheet */
:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --accent: #10b981;
  --accent-hover: #059669;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --board-light: #ececd0;
  --board-dark: #739552;
  --sq-highlight: rgba(247, 247, 105, 0.5);
  --sq-last-move: rgba(245, 246, 130, 0.4);
  --sq-check: rgba(239, 68, 68, 0.7);
  --win-color: #10b981;
  --loss-color: #ef4444;
  --draw-color: #64748b;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

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

/* Header */
header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

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

.brand-icon {
  font-size: 1.75rem;
  color: var(--accent);
}

.brand-text h1 {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.2;
}

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

.top-bar-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

select, input, button {
  font-family: inherit;
  font-size: 0.875rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-tertiary);
  color: var(--text-main);
  padding: 0.4rem 0.75rem;
  outline: none;
  transition: all 0.2s ease;
}

select:focus, input:focus {
  border-color: var(--accent);
}

button {
  cursor: pointer;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

button:hover {
  background-color: #475569;
}

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

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

.badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
}

.badge.ready {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--accent);
  border: 1px solid var(--accent);
}

/* Main Layout */
main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(360px, 680px) 1fr;
  gap: 1.5rem;
  padding: 1.5rem;
  max-width: 1500px;
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 980px) {
  main {
    grid-template-columns: 1fr;
    padding: 1rem;
  }
}

/* Left Column: Board Section */
.game-area {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.player-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-secondary);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.player-info {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.player-avatar {
  width: 28px;
  height: 28px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}

.player-avatar.white {
  background: #f8fafc;
  color: #0f172a;
}

.player-avatar.black {
  background: #334155;
  color: #f8fafc;
}

.player-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.clock-timer {
  font-family: monospace;
  font-size: 1.5rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 6px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  min-width: 95px;
  text-align: center;
}

.clock-timer.low-time {
  background-color: rgba(239, 68, 68, 0.2);
  border-color: var(--loss-color);
  color: var(--loss-color);
  animation: pulse-red 1s infinite alternate;
}

@keyframes pulse-red {
  0% { transform: scale(1); }
  100% { transform: scale(1.04); }
}

/* Board & Eval Bar Container */
.board-container-row {
  display: flex;
  gap: 0.75rem;
  align-items: stretch;
}

/* Eval Bar */
.eval-bar-wrapper {
  width: 24px;
  background-color: #333;
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  flex-direction: column-reverse;
  position: relative;
  border: 1px solid var(--border-color);
}

.eval-bar-fill {
  width: 100%;
  height: 50%;
  background-color: #fff;
  transition: height 0.4s ease-out;
}

.eval-score-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-90deg);
  font-size: 0.65rem;
  font-weight: 700;
  color: #94a3b8;
  pointer-events: none;
  white-space: nowrap;
}

/* Chessboard */
.chessboard-wrapper {
  position: relative;
  flex: 1;
  aspect-ratio: 1 / 1;
  max-width: 600px;
  margin: 0 auto;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  border: 2px solid var(--border-color);
}

.chessboard {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  height: 100%;
}

.square {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}

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

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

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

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

.square.in-check {
  background-color: var(--sq-check) !important;
  box-shadow: inset 0 0 15px rgba(239, 68, 68, 0.9);
}

.coord {
  position: absolute;
  font-size: 0.65rem;
  font-weight: 700;
  pointer-events: none;
}

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

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

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

.file-coord {
  bottom: 2px;
  right: 3px;
}

.piece {
  width: 90%;
  height: 90%;
  cursor: grab;
  z-index: 2;
  transition: transform 0.1s ease;
}

.piece:active {
  cursor: grabbing;
  transform: scale(1.1);
}

.piece svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* Legal Move Indicators */
.legal-move-dot {
  width: 25%;
  height: 25%;
  background-color: rgba(0, 0, 0, 0.25);
  border-radius: 50%;
  pointer-events: none;
  z-index: 1;
}

.legal-capture-ring {
  width: 85%;
  height: 85%;
  border: 4px solid rgba(0, 0, 0, 0.25);
  border-radius: 50%;
  pointer-events: none;
  z-index: 1;
}

/* Pawn Promotion Modal */
.promotion-modal {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.promotion-dialog {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

.promotion-pieces {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.promotion-piece-btn {
  width: 60px;
  height: 60px;
  padding: 6px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
}

.promotion-piece-btn:hover {
  background-color: var(--accent);
  transform: translateY(-2px);
}

/* Game Status banner & engine info */
.game-info-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  background-color: var(--bg-secondary);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

/* Right Column: Sidebar Panels */
.sidebar-panel {
  background-color: var(--bg-secondary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: 750px;
}

.tab-header {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  background-color: #162032;
}

.tab-btn {
  flex: 1;
  padding: 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  border-radius: 0;
}

.tab-btn:hover {
  color: var(--text-main);
  background-color: rgba(255, 255, 255, 0.02);
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background-color: var(--bg-secondary);
}

.tab-content {
  display: none;
  padding: 1rem;
  flex: 1;
  overflow-y: auto;
}

.tab-content.active {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Spectator & Action Button Rows */
.panel-action-bar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.speed-control-box {
  background-color: var(--bg-primary);
  padding: 0.6rem 0.8rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.speed-control-box input[type="range"] {
  flex: 1;
}

/* Move List Table */
.moves-table-container {
  flex: 1;
  min-height: 240px;
  max-height: 380px;
  overflow-y: auto;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

.moves-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.moves-table th {
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  font-weight: 600;
  text-align: left;
  padding: 0.4rem 0.6rem;
  font-size: 0.75rem;
  position: sticky;
  top: 0;
}

.moves-table td {
  padding: 0.35rem 0.6rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.moves-table tr:hover {
  background-color: rgba(255, 255, 255, 0.03);
}

.move-num {
  width: 18%;
  color: var(--text-muted);
  font-family: monospace;
}

.move-san {
  cursor: pointer;
  font-weight: 500;
}

.move-san:hover {
  color: var(--accent);
}

/* Stats Cards */
.stats-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
}

.stat-card {
  background-color: var(--bg-primary);
  padding: 0.75rem 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  text-align: center;
}

.stat-number {
  font-size: 1.25rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.stat-card.win .stat-number { color: var(--win-color); }
.stat-card.loss .stat-number { color: var(--loss-color); }
.stat-card.draw .stat-number { color: var(--draw-color); }

.ratio-bar-container {
  height: 10px;
  display: flex;
  border-radius: 999px;
  overflow: hidden;
  background-color: var(--bg-primary);
  margin-top: 0.5rem;
  border: 1px solid var(--border-color);
}

.ratio-bar-fill.win { background-color: var(--win-color); }
.ratio-bar-fill.loss { background-color: var(--loss-color); }
.ratio-bar-fill.draw { background-color: var(--draw-color); }

.ratio-text {
  font-size: 0.8rem;
  text-align: center;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* History List Table */
.history-table-container {
  overflow-y: auto;
  max-height: 400px;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.history-table th, .history-table td {
  padding: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
}

.btn-sm {
  padding: 0.2rem 0.4rem;
  font-size: 0.75rem;
}

.text-danger {
  color: var(--loss-color);
}

/* Upset & Analysis Cards */
.upset-header h4 {
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.upset-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--border-color);
  padding: 0.75rem;
  border-radius: 6px;
  margin-bottom: 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
}

.upset-card.blunder {
  border-left-color: var(--loss-color);
}

.upset-card.mistake {
  border-left-color: #f59e0b;
}

.upset-card.inaccuracy {
  border-left-color: #3b82f6;
}

.upset-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pv-tag {
  background-color: var(--bg-tertiary);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-family: monospace;
  font-weight: 600;
  color: var(--accent);
}

.pv-line {
  font-family: monospace;
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
  margin-top: 0.25rem;
}

/* Progress bar */
.progress-bar-container {
  height: 6px;
  background-color: var(--bg-primary);
  border-radius: 999px;
  overflow: hidden;
  margin: 0.5rem 0;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--accent);
  transition: width 0.2s ease;
}

.progress-text {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Game Navigation Controls */
.game-nav-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 0.75rem;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.nav-btn {
  padding: 0.35rem 0.65rem;
  font-size: 0.85rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.nav-btn:hover:not(:disabled) {
  background-color: #475569;
  border-color: var(--accent);
}

.nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.nav-ply-indicator {
  font-family: monospace;
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 75px;
  text-align: center;
}

/* Engine Best Move Highlight on Board */
.square.best-move-hint {
  box-shadow: inset 0 0 0 3px rgba(16, 185, 129, 0.95);
  background-color: rgba(16, 185, 129, 0.35) !important;
}

/* Global Modal System */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 1rem;
}

.modal-dialog {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 100%;
  max-width: 650px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: modalFadeIn 0.2s ease-out;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(255, 255, 255, 0.02);
}

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  line-height: 1;
}

.modal-close-btn:hover {
  color: var(--text-main);
  background: transparent;
}

.modal-tabs {
  display: flex;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 0 1rem;
  gap: 0.25rem;
  overflow-x: auto;
}

.modal-tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  padding: 0.65rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 0;
  cursor: pointer;
  white-space: nowrap;
}

.modal-tab-btn:hover {
  color: var(--text-main);
  background: transparent;
}

.modal-tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  background: transparent;
}

.modal-body {
  padding: 1.25rem;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-tab-content {
  display: none;
  flex-direction: column;
  gap: 0.85rem;
}

.modal-tab-content.active {
  display: flex;
}

.modal-textarea {
  width: 100%;
  height: 150px;
  font-family: monospace;
  font-size: 0.85rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-main);
  padding: 0.75rem;
  resize: vertical;
  line-height: 1.4;
}

.file-dropzone {
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  padding: 2.2rem 1.5rem;
  text-align: center;
  background-color: var(--bg-primary);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.file-dropzone:hover, .file-dropzone.dragover {
  border-color: var(--accent);
  background-color: rgba(16, 185, 129, 0.05);
}

.dropzone-icon {
  font-size: 2.5rem;
  color: var(--accent);
}

.preset-card-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.preset-game-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.85rem;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.preset-game-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.preset-game-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
}

.preset-game-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  gap: 1rem;
}

.preset-game-desc {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.35;
}

/* Move Table Active Move */
.move-san.active-move {
  background-color: var(--accent) !important;
  color: #fff !important;
  font-weight: 700;
  border-radius: 4px;
}

.move-annotation {
  font-size: 0.75rem;
  font-weight: 800;
  margin-left: 0.2rem;
}

.move-annotation.blunder { color: var(--loss-color); }
.move-annotation.mistake { color: #f59e0b; }
.move-annotation.inaccuracy { color: #3b82f6; }
.move-annotation.best { color: var(--accent); }

/* Evaluation Chart */
.eval-chart-container {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem;
  margin: 0.75rem 0;
  position: relative;
}

.eval-chart-header {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  display: flex;
  justify-content: space-between;
}

.eval-chart-svg {
  width: 100%;
  height: 120px;
  overflow: visible;
  cursor: pointer;
}

/* Accuracy Summary Card */
.accuracy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.accuracy-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.accuracy-score {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent);
}

.accuracy-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.accuracy-breakdown {
  display: flex;
  gap: 0.35rem;
  font-size: 0.75rem;
  margin-top: 0.35rem;
  flex-wrap: wrap;
  justify-content: center;
}

.breakdown-item {
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-weight: 600;
}

.breakdown-item.blunder { background: rgba(239, 68, 68, 0.2); color: var(--loss-color); }
.breakdown-item.mistake { background: rgba(245, 158, 11, 0.2); color: #f59e0b; }
.breakdown-item.inaccuracy { background: rgba(59, 130, 246, 0.2); color: #3b82f6; }
.breakdown-item.best { background: rgba(16, 185, 129, 0.2); color: var(--accent); }

/* Live Engine Eval Box */
.live-eval-box {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  font-family: monospace;
  margin-bottom: 0.6rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}