/* ============================================================
   CSS VARIABLES — dark-luxury palette inspired by GM tournaments
   ============================================================ */
:root {
  --bg-primary: #0a0a0c;
  --bg-card: #131317;
  --bg-card-hover: #1a1a20;
  --border: #232330;
  --text-primary: #e8e6e3;
  --text-secondary: #8a8a9a;
  --text-muted: #55556a;
  --accent: #c89b3c;        /* gold — trophy-inspired */
  --accent-glow: #c89b3c33;
  --accent-hover: #ddb04a;
  --danger: #e04848;
  --success: #4caf7d;
  --info: #5b8fd9;
  --white-sq: #e8dcc8;
  --black-sq: #7d6a4f;
  --highlight: #c89b3c55;
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', -apple-system, sans-serif;
  --radius: 10px;
  --shadow: 0 8px 32px rgba(0,0,0,.45);
}

/* ============================================================
   RESET & GLOBAL STYLES
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { overflow-x: hidden; }

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  max-width: 100vw;
}

/* Subtle grain texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
}

/* ============================================================
   HEADER
   ============================================================ */
header {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 2.5rem 1rem 1rem;
  width: 100%;
}

header h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: .02em;
  background: linear-gradient(135deg, var(--accent) 0%, #f0d78c 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header p {
  color: var(--text-muted);
  font-size: .9rem;
  margin-top: .35rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

/* ============================================================
   MAIN CONTAINER
   ============================================================ */
.arena {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  padding: 0 1rem 3rem;
  width: 100%;
  max-width: 560px;
  overflow-x: hidden;
}

/* ============================================================
   STATUS BAR — afișează check / checkmate / draw / tura curentă
   ============================================================ */
.status-bar {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  box-shadow: var(--shadow);
  transition: border-color .3s;
}

.status-bar.in-check {
  border-color: var(--danger);
  box-shadow: 0 0 20px rgba(224,72,72,.15);
}

.status-bar.game-over {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

.status-icon {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--success);
  flex-shrink: 0;
  animation: pulse 2s infinite;
}

.status-bar.game-over .status-icon { background: var(--danger); animation: none; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .4; }
}

.status-text {
  flex: 1;
  font-size: .95rem;
  font-weight: 500;
}

.turn-badge {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  padding: .3rem .7rem;
  border-radius: 6px;
  background: var(--bg-card-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  white-space: nowrap;
}

/* Opening name */
.opening-name {
  font-size: .78rem;
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  min-height: 1.2em;
  transition: color .3s;
}

.opening-name:not(:empty) {
  color: var(--text-secondary);
}

/* ============================================================
   CHESSBOARD — override chessboard.js styles
   ============================================================ */
#board-container {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  max-width: 480px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow), 0 0 60px rgba(200,155,60,.06);
  border: 2px solid var(--border);
}

#board {
  width: 100%;
  user-select: none;
  -webkit-user-select: none;
}

/* chessboard.js appends the dragged piece to <body> with no z-index —
   force it above everything so the piece stays visible while dragging */
body > .piece-417db {
  z-index: 99999 !important;
}

.arrow-overlay {
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 10;
}

/* Custom square colors */
.board-b72b1d .white-1e1d7 { background-color: var(--white-sq) !important; }
.board-b72b1d .black-3c85d { background-color: var(--black-sq) !important; }

/* Highlight la mutări legale */
.highlight-legal {
  background: radial-gradient(circle, var(--highlight) 25%, transparent 25%) !important;
}
.highlight-source {
  background-color: #c89b3c44 !important;
}

/* Click-to-move */
.click-selected {
  background-color: #c89b3c66 !important;
}
.click-target {
  background: radial-gradient(circle, var(--highlight) 25%, transparent 25%) !important;
  cursor: pointer;
}

/* Custom drag ghost */
.drag-ghost-chess {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%) scale(1.08);
  cursor: grabbing;
  opacity: 0.92;
}

.highlight-premove {
  background-color: rgba(91, 143, 217, 0.4) !important;
}

/* ============================================================
   CONTROLS — buttons below board
   ============================================================ */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  width: 100%;
  justify-content: center;
}

.btn {
  font-family: var(--font-body);
  font-size: .85rem;
  font-weight: 600;
  padding: .65rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  transition: all .2s;
  display: flex;
  align-items: center;
  gap: .4rem;
  letter-spacing: .02em;
}

.btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  color: var(--accent-hover);
  transform: translateY(-1px);
}

.btn:active { transform: translateY(0); }

.btn:disabled {
  opacity: .4;
  cursor: not-allowed;
  transform: none;
}

.btn:disabled:hover {
  background: var(--bg-card);
  border-color: var(--border);
  color: var(--text-primary);
  transform: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #ddb04a);
  color: #0a0a0c;
  border-color: var(--accent);
}

.btn-primary:hover {
  color: #0a0a0c;
  box-shadow: 0 4px 18px var(--accent-glow);
}

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

.btn-danger:hover {
  background: rgba(224,72,72,.1);
  border-color: var(--danger);
  color: #f06060;
}

/* ============================================================
   COLOR CHOOSER — dialog de alegere culoare
   ============================================================ */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  transition: opacity .3s;
}

.overlay.visible { opacity: 1; }
.overlay.hidden { display: none; }

.dialog {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  max-width: 360px;
  width: 90%;
}

.dialog h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
  margin-bottom: .5rem;
}

.dialog p {
  color: var(--text-secondary);
  font-size: .9rem;
  margin-bottom: 1.5rem;
}

.color-options {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.color-btn {
  width: 80px; height: 80px;
  border-radius: 12px;
  border: 2px solid var(--border);
  cursor: pointer;
  transition: all .25s;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  background: var(--bg-card-hover);
}

.color-btn:hover {
  border-color: var(--accent);
  transform: scale(1.08);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* ============================================================
   DIFFICULTY SELECTOR
   ============================================================ */
.difficulty-selector {
  display: flex;
  gap: .4rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: .75rem;
}

.difficulty-selector label {
  color: var(--text-secondary);
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  width: 100%;
  text-align: center;
  margin-bottom: .25rem;
}

.diff-btn {
  font-family: var(--font-body);
  font-size: .75rem;
  font-weight: 600;
  padding: .4rem .8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-card-hover);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all .2s;
  letter-spacing: .02em;
}

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

.diff-btn.active {
  background: var(--accent);
  color: #0a0a0c;
  border-color: var(--accent);
}

/* Time control selector (mirrors difficulty-selector) */
.time-selector {
  display: flex;
  gap: .4rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: .75rem;
}

.time-selector label {
  color: var(--text-secondary);
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  width: 100%;
  text-align: center;
  margin-bottom: .25rem;
}

.time-btn {
  font-family: var(--font-body);
  font-size: .75rem;
  font-weight: 600;
  padding: .4rem .8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-card-hover);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all .2s;
  letter-spacing: .02em;
}

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

.time-btn.active {
  background: var(--accent);
  color: #0a0a0c;
  border-color: var(--accent);
}

/* Game clock display */
.clock {
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 700;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: .15rem .5rem;
  margin-left: auto;
  align-self: center;
  min-width: 48px;
  text-align: center;
  transition: all .3s;
}

.clock:empty {
  display: none;
}

.clock.clock-active {
  color: var(--text-primary);
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.clock.clock-low {
  color: var(--danger);
  border-color: var(--danger);
  animation: clockPulse 1s infinite;
}

@keyframes clockPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .6; }
}

/* ============================================================
   PROMOTION DIALOG
   ============================================================ */
.promotion-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  transition: opacity .3s;
}

.promotion-overlay.visible { opacity: 1; }
.promotion-overlay.hidden { display: none; }

.promotion-dialog {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.promotion-dialog h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.promotion-options {
  display: flex;
  gap: .75rem;
  justify-content: center;
}

.promotion-piece {
  width: 64px; height: 64px;
  border-radius: 10px;
  border: 2px solid var(--border);
  cursor: pointer;
  transition: all .25s;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card-hover);
  padding: 8px;
}

.promotion-piece img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.promotion-piece:hover {
  border-color: var(--accent);
  transform: scale(1.1);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* ============================================================
   GHOST PIECE — keeps piece visible on source square while dragging
   ============================================================ */
.ghost-piece {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.45;
  pointer-events: none;
  z-index: 1;
}

/* ============================================================
   CAPTURED PIECES
   ============================================================ */
.captured-pieces {
  width: 100%;
  display: flex;
  justify-content: space-between;
  gap: .5rem;
  min-height: 32px;
}

.captured-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
}

.captured-group img {
  width: 24px;
  height: 24px;
  opacity: .7;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,.5));
}

.captured-advantage {
  font-size: .8rem;
  font-weight: 600;
  color: var(--accent);
  margin-left: .25rem;
  align-self: center;
}

/* ============================================================
   EVALUATION BAR
   ============================================================ */
.eval-container {
  position: relative;
  width: 24px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #1a1a20;
  flex-shrink: 0;
  align-self: stretch;
}

.eval-bar-fill {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: var(--white-sq);
  transition: height .6s ease;
}

.eval-label {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: .6rem;
  font-weight: 700;
  z-index: 2;
  text-shadow: 0 1px 3px rgba(0,0,0,.6);
  white-space: nowrap;
}

.eval-label-top {
  top: 4px;
  color: var(--text-primary);
}

.eval-label-bottom {
  bottom: 4px;
  color: #333;
}

.board-eval-wrapper {
  display: flex;
  gap: .75rem;
  width: 100%;
  max-width: min(510px, calc(100vw - 2rem));
  justify-content: center;
  align-items: stretch;
}

.board-eval-wrapper #board-container {
  flex: 1;
  max-width: 480px;
  align-self: flex-start;
}

/* ============================================================
   MOVE HISTORY
   ============================================================ */
.history-panel {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .85rem 1rem;
  max-height: 120px;
  overflow-y: auto;
  box-shadow: var(--shadow);
}

.history-panel::-webkit-scrollbar { width: 6px; }
.history-panel::-webkit-scrollbar-track { background: transparent; }
.history-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: .5rem;
}

.history-title {
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--text-muted);
}

.history-nav {
  display: flex;
  gap: .25rem;
}

.nav-btn {
  font-size: .75rem;
  padding: .15rem .4rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-card-hover);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all .2s;
  line-height: 1;
}

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

.history-moves {
  display: flex;
  flex-wrap: wrap;
  gap: .2rem .5rem;
  font-size: .82rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.move-number { color: var(--text-muted); }
.move-white, .move-black { cursor: pointer; transition: color .2s; border-radius: 3px; padding: 0 .15rem; }
.move-white { color: var(--text-primary); }
.move-black { color: var(--accent); }
.move-white:hover, .move-black:hover { background: var(--bg-card-hover); }
.move-white.active, .move-black.active {
  background: var(--accent);
  color: #0a0a0c;
}

/* ============================================================
   THINKING INDICATOR
   ============================================================ */
.thinking {
  display: none;
  align-items: center;
  gap: .5rem;
  color: var(--text-secondary);
  font-size: .85rem;
}

.thinking.active { display: flex; }

.thinking-dots span {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  animation: dotBounce .6s infinite alternate;
}
.thinking-dots span:nth-child(2) { animation-delay: .15s; }
.thinking-dots span:nth-child(3) { animation-delay: .3s; }

@keyframes dotBounce {
  to { opacity: .2; transform: translateY(-3px); }
}

/* ============================================================
   CONFIRM DIALOG
   ============================================================ */
.confirm-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 150;
  opacity: 0;
  transition: opacity .3s;
}

.confirm-overlay.visible { opacity: 1; }
.confirm-overlay.hidden { display: none; }

.confirm-dialog {
  background: var(--bg-card);
  border: 1px solid var(--danger);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow);
  max-width: 320px;
  width: 90%;
}

.confirm-dialog h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: .5rem;
  color: var(--danger);
}

.confirm-dialog p {
  color: var(--text-secondary);
  font-size: .9rem;
  margin-bottom: 1.25rem;
}

.confirm-actions {
  display: flex;
  gap: .75rem;
  justify-content: center;
}

/* FEN input */
.fen-input {
  width: 100%;
  font-family: monospace;
  font-size: .82rem;
  padding: .5rem .6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-primary);
  margin-bottom: .75rem;
  outline: none;
  transition: border-color .2s;
}

.fen-input:focus {
  border-color: var(--accent);
}

.fen-error {
  color: var(--danger);
  font-size: .8rem;
  margin-bottom: .75rem;
}

/* ============================================================
   SOUND & THEME TOGGLES
   ============================================================ */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
  justify-content: center;
}

.toolbar-btn {
  font-family: var(--font-body);
  font-size: .8rem;
  padding: .4rem .65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all .2s;
  display: flex;
  align-items: center;
  gap: .3rem;
}

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

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

/* ============================================================
   KEYBOARD SHORTCUTS HINT
   ============================================================ */
.shortcuts-hint {
  color: var(--text-muted);
  font-size: .7rem;
  text-align: center;
  letter-spacing: .05em;
}

.shortcuts-hint kbd {
  display: inline-block;
  padding: .1rem .35rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-card-hover);
  font-family: var(--font-body);
  font-size: .65rem;
  margin: 0 .15rem;
}

/* ============================================================
   GAME ARCHIVE
   ============================================================ */
.game-archive {
  width: 100%;
  padding: .75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-height: 200px;
  overflow-y: auto;
}

.archive-list {
  display: flex;
  flex-direction: column;
  gap: .3rem;
}

.archive-empty {
  color: var(--text-muted);
  font-size: .82rem;
  text-align: center;
  padding: .5rem 0;
}

.archive-item {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .4rem .5rem;
  border-radius: 6px;
  background: var(--bg-card-hover);
  cursor: pointer;
  transition: background .2s;
  font-size: .8rem;
}

.archive-item:hover {
  background: var(--border);
}

.archive-result {
  font-weight: 700;
  font-size: .75rem;
  padding: .15rem .4rem;
  border-radius: 4px;
  min-width: 36px;
  text-align: center;
}

.result-win { background: var(--success); color: #fff; }
.result-loss { background: var(--danger); color: #fff; }
.result-draw { background: var(--text-muted); color: #fff; }

.archive-info {
  flex: 1;
  color: var(--text-secondary);
}

.archive-date {
  color: var(--text-muted);
  font-size: .7rem;
}

/* ============================================================
   GAME RESULT MODAL
   ============================================================ */
.result-modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow);
  max-width: 340px;
  width: 90%;
  animation: resultPop .35s ease-out;
}

@keyframes resultPop {
  0% { transform: scale(.85); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.result-modal-icon {
  font-size: 3.5rem;
  margin-bottom: .5rem;
}

.result-modal-icon.result-win { color: var(--accent); }
.result-modal-icon.result-loss { color: var(--danger); }
.result-modal-icon.result-draw { color: var(--text-secondary); }

.result-modal-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.6rem;
  margin-bottom: .25rem;
}

.result-modal-title.result-win { color: var(--accent); }
.result-modal-title.result-loss { color: var(--danger); }
.result-modal-title.result-draw { color: var(--text-secondary); }

.result-modal-detail {
  color: var(--text-secondary);
  font-size: .9rem;
  margin-bottom: .25rem;
}

.result-modal-moves {
  color: var(--text-muted);
  font-size: .8rem;
  margin-bottom: 1.5rem;
}

.result-modal-actions {
  display: flex;
  gap: .75rem;
  justify-content: center;
}

/* ============================================================
   ENGINE LOADING INDICATOR
   ============================================================ */
.engine-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(10, 10, 12, .5);
  z-index: 15;
  gap: .75rem;
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: .85rem;
  pointer-events: none;
}

.engine-loading.hidden { display: none; }

.engine-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

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

/* ============================================================
   ARCHIVE DELETE BUTTON
   ============================================================ */
.archive-delete {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0 .3rem;
  line-height: 1;
  border-radius: 4px;
  transition: all .2s;
  flex-shrink: 0;
}

.archive-delete:hover {
  color: var(--danger);
  background: rgba(224,72,72,.1);
}

/* ============================================================
   ELO SLIDER
   ============================================================ */
.elo-slider-row {
  display: flex;
  align-items: center;
  gap: .5rem;
  width: 100%;
  margin-top: .4rem;
}

.elo-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  outline: none;
}

.elo-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg-card);
  box-shadow: 0 0 6px var(--accent-glow);
}

.elo-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid var(--bg-card);
}

.elo-value {
  font-size: .75rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 36px;
  text-align: center;
}

/* ============================================================
   CUSTOM TIME CONTROL
   ============================================================ */
.custom-time-row {
  display: flex;
  align-items: center;
  gap: .35rem;
  width: 100%;
  margin-top: .4rem;
  font-size: .8rem;
  color: var(--text-secondary);
  justify-content: center;
}

.custom-time-row.hidden { display: none; }

.custom-time-input {
  width: 48px;
  font-family: var(--font-body);
  font-size: .8rem;
  font-weight: 600;
  padding: .3rem .4rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-primary);
  text-align: center;
  outline: none;
}

.custom-time-input:focus { border-color: var(--accent); }

/* ============================================================
   PGN IMPORT
   ============================================================ */
.pgn-input {
  width: 100%;
  font-family: monospace;
  font-size: .8rem;
  padding: .5rem .6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-primary);
  margin-bottom: .75rem;
  outline: none;
  resize: vertical;
  min-height: 80px;
  transition: border-color .2s;
}

.pgn-input:focus { border-color: var(--accent); }

/* ============================================================
   PLAYER STATISTICS
   ============================================================ */
.stats-panel {
  width: 100%;
  padding: .75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .5rem;
  margin-top: .5rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .1rem;
  padding: .4rem .25rem;
  background: var(--bg-card-hover);
  border-radius: 6px;
}

.stat-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-value.stat-win { color: var(--success); }
.stat-value.stat-loss { color: var(--danger); }

.stat-label {
  font-size: .65rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
}

/* ============================================================
   ANALYSIS ANNOTATIONS
   ============================================================ */
.move-annotation {
  font-size: .7rem;
  font-weight: 700;
  margin-left: 1px;
}

.move-annotation.blunder { color: var(--danger); }
.move-annotation.mistake { color: #e8a838; }
.move-annotation.inaccuracy { color: var(--info); }
.move-annotation.good { color: var(--success); }

/* Puzzle streak display */
.puzzle-streak {
  font-size: .8rem;
  color: var(--text-secondary);
  text-align: center;
  margin-top: .25rem;
}

.puzzle-streak strong {
  color: var(--accent);
}

/* ============================================================
   BOARD THEMES
   ============================================================ */
.board-theme-green .white-1e1d7 { background-color: #eeeed2 !important; }
.board-theme-green .black-3c85d { background-color: #769656 !important; }

.board-theme-blue .white-1e1d7 { background-color: #dee3e6 !important; }
.board-theme-blue .black-3c85d { background-color: #8ca2ad !important; }

.board-theme-wood .white-1e1d7 { background-color: #f0d9b5 !important; }
.board-theme-wood .black-3c85d { background-color: #b58863 !important; }

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  position: relative;
  z-index: 1;
  padding: 1rem;
  color: var(--text-muted);
  font-size: .75rem;
  text-align: center;
}

/* ============================================================
   LIGHT THEME
   ============================================================ */
body.light-theme {
  --bg-primary: #f0ece4;
  --bg-card: #ffffff;
  --bg-card-hover: #f5f3ef;
  --border: #d4d0c8;
  --text-primary: #1a1a1a;
  --text-secondary: #5a5a6a;
  --text-muted: #8a8a9a;
  --accent: #b8860b;
  --accent-glow: #b8860b33;
  --accent-hover: #d4a017;
  --shadow: 0 8px 32px rgba(0,0,0,.12);
}

body.light-theme::before {
  opacity: 0;
}

body.light-theme header h1 {
  background: linear-gradient(135deg, #8b6914 0%, #d4a017 50%, #8b6914 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
/* Touch-friendly: prevent scroll interference on board */
#board-container {
  touch-action: none;
}

/* Disable hover effects on touch devices */
@media (hover: none) {
  .btn:hover { background: var(--bg-card-hover); }
  .diff-btn:hover, .time-btn:hover { border-color: var(--border); color: var(--text-secondary); }
  .move-white:hover, .move-black:hover { background: transparent; }
  .nav-btn:hover { border-color: var(--border); color: var(--text-secondary); }
  .highlight-legal { display: none; }
}

/* Tablet / larger screens — expand board area */
@media (min-width: 640px) {
  .arena { max-width: 620px; }
  #board-container { max-width: 560px; }
  .board-eval-wrapper { max-width: 590px; }
}

@media (min-width: 900px) {
  .arena { max-width: 700px; }
  #board-container { max-width: 620px; }
  .board-eval-wrapper { max-width: 660px; }
}

/* Landscape mobile */
@media (max-height: 500px) and (orientation: landscape) {
  header { padding: 1rem 1rem .5rem; }
  header h1 { font-size: 1.5rem; }
  header p { display: none; }
  .arena { gap: .6rem; padding-bottom: 1rem; }
  .status-bar { padding: .5rem .8rem; }
  .history-panel { max-height: 80px; }
  .game-archive { max-height: 80px; }
}

@media (max-width: 520px) {
  .controls { gap: .4rem; }
  .btn { font-size: .78rem; padding: .55rem .9rem; min-height: 44px; }
  .color-btn { width: 65px; height: 65px; font-size: 1.8rem; }
  .eval-container { width: 18px; }
  .board-eval-wrapper { gap: .5rem; }
  .toolbar-btn { min-height: 44px; min-width: 44px; }
  .nav-btn { min-height: 36px; min-width: 36px; }
  .promotion-piece { min-width: 56px; min-height: 56px; }
  .diff-btn, .time-btn { min-height: 38px; }
}

/* ============================================================
   ARENA NAV — back link to Board Game Arena landing page
   ============================================================ */
.arena-nav {
  text-align: center;
  padding: .5rem 0 0;
}

.arena-nav-link {
  font-family: 'Cinzel', 'Playfair Display', Georgia, serif;
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: #c89b3c;
  text-decoration: none;
  opacity: .6;
  transition: opacity .2s;
}

.arena-nav-link:hover { opacity: 1; }