/* ==========================================================================
   SKINS: FONDOS (Backgrounds)
   ========================================================================== */
body.skin-bg-default {
  background: var(--bg-gradient);
}

body.skin-bg-cyberpunk {
  background: linear-gradient(135deg, #18002E 0%, #3B0764 45%, #701A75 80%, #090014 100%) !important;
  --surface-accent: #EC4899;
  --surface-accent-hover: #DB2777;
  --board-border-thick: #F43F5E;
}

body.skin-bg-forest {
  background: linear-gradient(135deg, #022C22 0%, #064E3B 50%, #065F46 80%, #022C22 100%) !important;
  --surface-accent: #10B981;
  --surface-accent-hover: #059669;
  --board-border-thick: #34D399;
}

body.skin-bg-sunset {
  background: linear-gradient(135deg, #450A0A 0%, #7C2D12 40%, #C2410C 75%, #431407 100%) !important;
  --surface-accent: #F97316;
  --surface-accent-hover: #EA580C;
  --board-border-thick: #FBA048;
}

body.skin-bg-obsidian {
  background: radial-gradient(circle at 50% 20%, #171717 0%, #0A0A0A 60%, #000000 100%) !important;
  --surface-accent: #E2E8F0;
  --surface-accent-hover: #CBD5E1;
  --board-border-thick: #94A3B8;
}

/* ==========================================================================
   SKINS: TIPOGRAFÍAS DE NÚMEROS (Fonts)
   ========================================================================== */
.skin-font-default .cell-value,
.skin-font-default .numpad-btn {
  font-family: var(--font-family) !important;
}

/* Chibi / Kawaii redondeado */
.skin-font-comic_chibi .cell-value,
.skin-font-comic_chibi .numpad-btn {
  font-family: "Comfortaa", "Quicksand", "Nunito", "Comic Sans MS", cursive, sans-serif !important;
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* Arcano / Serif clásico */
.skin-font-serif_arcane .cell-value,
.skin-font-serif_arcane .numpad-btn {
  font-family: "Cinzel", "Georgia", "Times New Roman", serif !important;
  font-weight: 700;
  letter-spacing: -0.5px;
}

/* Retro Monospace / Digital arcade */
.skin-font-digital_mono .cell-value,
.skin-font-digital_mono .numpad-btn {
  font-family: "Courier New", "Lucida Console", Monaco, monospace !important;
  font-weight: 800;
  letter-spacing: 1px;
}

/* ==========================================================================
   SKINS: TEXTURAS DEL TABLERO (Board Textures)
   ========================================================================== */
/* Por defecto: Glassmorphism suave */
.skin-texture-default .sudoku-grid {
  backdrop-filter: blur(12px);
}

/* Textura Papel Pergamino */
.skin-texture-paper .sudoku-grid {
  background-color: #2D261E !important;
  background-image: 
    radial-gradient(rgba(245, 230, 211, 0.05) 15%, transparent 16%),
    radial-gradient(rgba(245, 230, 211, 0.05) 15%, transparent 16%) !important;
  background-size: 16px 16px !important;
  background-position: 0 0, 8px 8px !important;
  border-color: #A16207 !important;
}
.skin-texture-paper .sudoku-cell {
  background: rgba(45, 38, 30, 0.8) !important;
}
.skin-texture-paper .sudoku-cell.selected {
  background: #78350F !important;
}

/* Textura Fibra de Carbono */
.skin-texture-carbon .sudoku-grid {
  background-color: #111111 !important;
  background-image: 
    linear-gradient(45deg, #1c1c1c 25%, transparent 25%), 
    linear-gradient(-45deg, #1c1c1c 25%, transparent 25%), 
    linear-gradient(45deg, transparent 75%, #1c1c1c 75%), 
    linear-gradient(-45deg, transparent 75%, #1c1c1c 75%) !important;
  background-size: 8px 8px !important;
  background-position: 0 0, 0 4px, 4px -4px, -4px 0px !important;
  border-color: #38BDF8 !important;
}
.skin-texture-carbon .sudoku-cell {
  background: rgba(20, 20, 20, 0.85) !important;
}
.skin-texture-carbon .sudoku-cell.selected {
  background: #0369A1 !important;
}

/* Textura Madera */
.skin-texture-wood .sudoku-grid {
  background: #3B2011 !important;
  border-color: #D97706 !important;
  box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.6), 0 10px 25px rgba(0, 0, 0, 0.4) !important;
}
.skin-texture-wood .sudoku-cell {
  background: #2E190E !important;
}
.skin-texture-wood .sudoku-cell.selected {
  background: #92400E !important;
}

/* ==========================================================================
   MODAL DE TIENDA Y ELEMENTOS UI
   ========================================================================== */
.shop-coins-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(245, 158, 11, 0.2);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #FBBF24;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 6px 14px;
  border-radius: 20px;
}

.shop-tabs {
  display: flex;
  gap: 6px;
  border-bottom: 1px solid var(--surface-border);
  padding-bottom: 8px;
  overflow-x: auto;
}

.shop-tab-btn {
  background: none;
  border: none;
  padding: 6px 12px;
  border-radius: 10px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.shop-tab-btn.active {
  background: var(--surface-accent);
  color: #FFFFFF;
}

.shop-items-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 290px;
  overflow-y: auto;
  padding-right: 4px;
}

.shop-item-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: 14px;
  background: var(--surface-card);
  border: 1px solid var(--surface-border);
  transition: border-color 0.15s ease;
}

.shop-item-card.is-equipped {
  border-color: var(--surface-accent);
  background: rgba(99, 102, 241, 0.12);
}

.shop-item-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.shop-item-icon {
  font-size: 1.8rem;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.2);
}

.shop-item-details {
  display: flex;
  flex-direction: column;
}

.shop-item-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-main);
}

.shop-item-desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.shop-action-btn {
  padding: 8px 14px;
  border-radius: 12px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: transform 0.15s ease;
  display: flex;
  align-items: center;
  gap: 4px;
}

.shop-action-btn:active {
  transform: scale(0.94);
}

.btn-buy {
  background: #F59E0B;
  color: #78350F;
}

.btn-equip {
  background: var(--btn-bg);
  color: var(--text-main);
}

.btn-equipped-label {
  background: rgba(99, 102, 241, 0.25);
  color: #818CF8;
  cursor: default;
}