@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;600;700;800&display=swap');

:root {
  --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  --board-bg: #1e293b;
  --grid-border: #334155;
  --card-bg: rgba(30, 41, 59, 0.7);
  --accent-color: #8b5cf6;
}

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background: var(--bg-gradient);
  color: #ffffff;
  min-height: 100vh;
  margin: 0;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

/* Glassmorphism Card Style */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1.25rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

/* Grid Arena Board */
#game-board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  gap: 4px;
  background-color: var(--board-bg);
  padding: 8px;
  border-radius: 1rem;
  border: 2px solid var(--grid-border);
  aspect-ratio: 1 / 1;
  max-width: 420px;
  margin: 0 auto;
}

.grid-cell {
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  transition: background-color 0.15s ease, transform 0.1s ease;
}

.grid-cell.highlight {
  background-color: rgba(255, 255, 255, 0.25) !important;
  transform: scale(0.95);
}

/* Block Colors & Shapes */
.block-filled {
  border-radius: 6px;
  box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.4), 0 4px 6px rgba(0, 0, 0, 0.3);
  animation: popIn 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.color-1 { background: linear-gradient(135deg, #ef4444, #dc2626); }
.color-2 { background: linear-gradient(135deg, #3b82f6, #2563eb); }
.color-3 { background: linear-gradient(135deg, #10b981, #059669); }
.color-4 { background: linear-gradient(135deg, #f59e0b, #d97706); }
.color-5 { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }
.color-6 { background: linear-gradient(135deg, #ec4899, #db2777); }

/* Tray Block Selection */
.blocks-tray {
  display: flex;
  justify-content: space-around;
  align-items: center;
  min-height: 110px;
  margin-top: 1rem;
}

.tray-item {
  display: grid;
  gap: 2px;
  padding: 8px;
  border-radius: 8px;
  cursor: grab;
  transition: transform 0.2s;
}

.tray-item:active { cursor: grabbing; transform: scale(1.1); }
.tray-item.disabled { opacity: 0.3; pointer-events: none; }

/* Animations */
@keyframes popIn {
  0% { transform: scale(0.3); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes lineClear {
  0% { transform: scale(1); filter: brightness(2); }
  50% { transform: scale(1.2); opacity: 0.8; }
  100% { transform: scale(0); opacity: 0; }
}

.clearing {
  animation: lineClear 0.3s forwards ease-in-out;
}

/* Combo Float Text Animation */
.combo-popup {
  position: absolute;
  font-weight: 800;
  font-size: 1.8rem;
  color: #facc15;
  text-shadow: 0 4px 10px rgba(0,0,0,0.5);
  animation: floatUp 0.8s forwards ease-out;
  pointer-events: none;
}

@keyframes floatUp {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(-40px) scale(1.4); }
}