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

body {
  font-family: 'Nunito', sans-serif;
  background: #1a1a2e;
  background-image: radial-gradient(circle at 30% 70%, #16213e 0%, #1a1a2e 60%);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  color: #fff;
  user-select: none;
}

/* ===== TOPBAR ===== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(4px);
  gap: 0.5rem;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 50;
}

.btn-back {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.85rem;
  background: rgba(255,255,255,0.15);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  transition: background 0.2s;
  white-space: nowrap;
}
.btn-back:hover { background: rgba(255,255,255,0.3); }

.game-title {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.topbar-info {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.info-badge {
  background: rgba(255,255,255,0.12);
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
}

/* ===== GAME LAYOUT ===== */
.game-layout {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 0.6rem;
  gap: 0.6rem;
  max-width: 860px;
  width: 100%;
  margin: 0 auto;
}

/* ===== OPPONENT SECTION (Multiplayer) ===== */
.opponent-section {
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  overflow: hidden;
  flex-shrink: 0;
}

.opponent-section .hand-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: rgba(255,255,255,0.5);
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 0.35rem 0.8rem;
  background: rgba(0,0,0,0.2);
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.opponent-hand {
  opacity: 0.8;
}

/* Back of tile styling */
.domino.back-tile {
  background: linear-gradient(145deg, #2d3436, #1e272e);
  border-color: #636e72;
  cursor: default;
}

.domino.back-tile:hover {
  transform: none;
  box-shadow: 0 2px 6px rgba(0,0,0,0.5);
}

.back-pattern {
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
  background-size: 8px 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-pattern::after {
  content: '🁢';
  font-size: 1.2rem;
  opacity: 0.3;
}

/* ===== MULTIPLAYER STATUS ===== */
.mp-status {
  text-align: center;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  margin: 0 auto;
  max-width: 90%;
}

.mp-status.waiting {
  background: linear-gradient(135deg, #f39c12, #e67e22);
  color: #fff;
  animation: pulse 1.5s ease-in-out infinite;
}

.mp-status.playing {
  background: linear-gradient(135deg, #27ae60, #2ecc71);
  color: #fff;
}

.mp-status.error {
  background: linear-gradient(135deg, #e74c3c, #c0392b);
  color: #fff;
}

.mp-status.hidden {
  display: none;
}

/* ===== CHAIN SECTION ===== */
.chain-section {
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  overflow: hidden;
  flex-shrink: 0;
}

.chain-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.8rem;
  background: rgba(0,0,0,0.2);
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.chain-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: rgba(255,255,255,0.5);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.end-badge {
  font-size: 0.78rem;
  font-weight: 800;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
}

.left-badge {
  background: #e94560;
  color: #fff;
}

.right-badge {
  background: #0f3460;
  color: #fff;
  border: 1px solid #4a90e2;
}

.chain-scroll-wrap {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.6rem 0.8rem;
  min-height: 110px;
  display: flex;
  align-items: center;
}

.chain-scroll-wrap::-webkit-scrollbar { height: 4px; }
.chain-scroll-wrap::-webkit-scrollbar-track { background: transparent; }
.chain-scroll-wrap::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 2px; }

.chain-area {
  display: flex;
  align-items: center;
  gap: 2px;
  min-width: max-content;
}

.chain-empty {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.3);
  font-style: italic;
  white-space: nowrap;
}

/* ===== CONTROLS SECTION ===== */
.controls-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex-shrink: 0;
}

.status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.turn-indicator {
  font-size: 0.9rem;
  font-weight: 800;
  padding: 0.35rem 1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #e94560, #c23152);
  color: #fff;
  letter-spacing: 0.5px;
  transition: background 0.3s;
}

.turn-indicator.ai-turn {
  background: linear-gradient(135deg, #0f3460, #1a5276);
}

.turn-indicator.thinking {
  background: linear-gradient(135deg, #6c4a9e, #4a2c72);
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.score-display {
  display: flex;
  gap: 0.8rem;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.7);
}
.score-display strong {
  color: #ffd700;
  font-size: 1rem;
}

.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

/* ===== BUTTONS ===== */
.btn {
  font-family: 'Nunito', sans-serif;
  font-weight: 700;
  font-size: 0.82rem;
  border: none;
  border-radius: 8px;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  transition: transform 0.1s, filter 0.15s;
  white-space: nowrap;
}
.btn:hover { filter: brightness(1.15); }
.btn:active { transform: scale(0.96); }
.btn.hidden { display: none !important; }

.btn-draw {
  background: linear-gradient(135deg, #27ae60, #1e8449);
  color: #fff;
}

.btn-pass {
  background: linear-gradient(135deg, #e67e22, #ca6f1e);
  color: #fff;
}

.btn-place-left {
  background: linear-gradient(135deg, #e94560, #c23152);
  color: #fff;
}

.btn-place-right {
  background: linear-gradient(135deg, #4a90e2, #2471a3);
  color: #fff;
}

.btn-new-game {
  background: rgba(255,255,255,0.12);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.2);
  margin-left: auto;
}
.btn-new-game:hover { background: rgba(255,255,255,0.2); }

/* ===== HAND SECTION ===== */
.hand-section {
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  overflow: hidden;
  flex-shrink: 0;
}

.hand-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: rgba(255,255,255,0.5);
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 0.35rem 0.8rem;
  background: rgba(0,0,0,0.2);
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.hand-scroll-wrap {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.7rem 0.8rem;
  min-height: 90px;
  display: flex;
  align-items: center;
}

.hand-scroll-wrap::-webkit-scrollbar { height: 4px; }
.hand-scroll-wrap::-webkit-scrollbar-track { background: transparent; }
.hand-scroll-wrap::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 2px; }

.hand-area {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  min-width: max-content;
}

/* ===== DOMINO TILE ===== */
.domino {
  display: flex;
  align-items: center;
  background: #fdfcf0;
  border-radius: 5px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.8);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  position: relative;
  border: 1.5px solid #c8c5a8;
  flex-shrink: 0;
}

.domino:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 14px rgba(0,0,0,0.6), inset 0 1px 0 rgba(255,255,255,0.8);
}

.domino.selected {
  transform: translateY(-8px);
  box-shadow: 0 10px 20px rgba(233,69,96,0.7), inset 0 1px 0 rgba(255,255,255,0.8);
  border-color: #e94560;
  z-index: 5;
}

.domino.valid-move {
  box-shadow: 0 2px 6px rgba(0,0,0,0.5), 0 0 0 2px #27ae60, inset 0 1px 0 rgba(255,255,255,0.8);
}

.domino.selected.valid-move {
  box-shadow: 0 10px 20px rgba(233,69,96,0.7), 0 0 0 2px #e94560, inset 0 1px 0 rgba(255,255,255,0.8);
}

/* Tile in hand: 72x36px */
.domino.hand-tile {
  width: 72px;
  height: 36px;
  flex-direction: row;
}

/* Tile in chain: 52x26px */
.domino.chain-tile {
  width: 52px;
  height: 26px;
  flex-direction: row;
  cursor: default;
}
.domino.chain-tile:hover {
  transform: none;
  box-shadow: 0 2px 6px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.8);
}

/* Divider between halves */
.domino .divider-h {
  width: 1.5px;
  height: 70%;
  background: #a09b7a;
  flex-shrink: 0;
}

/* Half of domino */
.domino .half {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  padding: 2px;
  gap: 1px;
  width: 100%;
  height: 100%;
}

/* Dot */
.domino .dot {
  border-radius: 50%;
  background: #2c2c2c;
  width: 100%;
  height: 100%;
}

.domino .dot.hidden-dot {
  visibility: hidden;
}

/* Chain tile new placement highlight */
.domino.chain-tile.new-tile {
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from { transform: scale(0.5); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(3px);
}
.modal-overlay.hidden { display: none; }

.modal-content {
  background: linear-gradient(145deg, #1e2a4a, #0f1626);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 16px;
  padding: 2rem 2.5rem;
  text-align: center;
  max-width: 340px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0,0,0,0.8);
}

.modal-icon {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.modal-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: #ffd700;
}

.modal-content p {
  font-size: 0.95rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 0.4rem;
}

#modal-score {
  font-size: 1.1rem;
  font-weight: 800;
  color: #ffd700;
  margin-bottom: 1.2rem;
}

.modal-content .btn-new-game {
  background: linear-gradient(135deg, #e94560, #c23152);
  color: #fff;
  border: none;
  font-size: 0.95rem;
  padding: 0.6rem 1.5rem;
  margin-left: 0;
}

/* ===== GAME INFO ===== */
.game-info {
  padding: 2rem 1.5rem;
  max-width: 860px;
  margin: 0 auto;
  color: rgba(255,255,255,0.75);
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 1rem;
}

.game-info h2 {
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.75rem;
}

.game-info h3 {
  font-size: 1rem;
  font-weight: 700;
  color: rgba(255,255,255,0.9);
  margin: 1rem 0 0.5rem;
}

.game-info p {
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.game-info ul {
  padding-left: 1.2rem;
  font-size: 0.88rem;
  line-height: 1.8;
}

.game-info li { margin-bottom: 0.2rem; }
.game-info strong { color: #ffd700; }

.game-info code {
  background: rgba(255,255,255,0.1);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.85rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .chain-scroll-wrap { min-height: 90px; padding: 0.5rem 0.6rem; }
  .hand-scroll-wrap { padding: 0.5rem 0.6rem; min-height: 80px; }
  .domino.hand-tile { width: 64px; height: 32px; }
  .domino.chain-tile { width: 44px; height: 22px; }
  .topbar-info { gap: 0.25rem; }
  .info-badge { font-size: 0.72rem; padding: 0.15rem 0.4rem; }

  .mp-status {
    font-size: 0.75rem;
    padding: 0.4rem 0.8rem;
  }
}