:root {
  --bg-color: #1a1a1a;
  --text-color: #e0e0e0;
  --primary-color: #646cff; /* Example premium purple/blue */
  --accent-color: #ff4081;
  --card-bg: #fff;
  --card-text: #333;
  --dungeon-bg: #2a2a2a;
  --success-color: #4caf50;
  --danger-color: #f44336;
  --staged-bg: rgba(255, 255, 255, 0.1);
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, Avenir, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  min-height: 100vh;
}

#app {
  width: 100%;
  max-width: 1200px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid #333;
  padding-bottom: 10px;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--primary-color);
}

#status-bar {
  display: flex;
  gap: 20px;
  font-weight: bold;
}

/* Dungeon Layout */
#dungeon {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
  background-color: var(--dungeon-bg);
  padding: 20px;
  border-radius: 12px;
  min-height: 400px;
  align-items: start; /* Align to top */
}

.dungeon-col {
  display: flex;
  flex-direction: column;
  gap: -60px; /* Stack effect */
  align-items: center;
  cursor: pointer; /* Interaction hint */
  padding-bottom: 20px;
}

.dungeon-col:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}

/* Staged Cards */
.staged-container {
    display: flex;
    flex-direction: column;
    gap: -80px;
    margin-top: 10px;
    align-items: center;
}

.staged-card {
    transform: scale(0.85); /* Slightly smaller to indicate sub-state */
    margin-top: -50px; /* Tight stack */
    border: 2px solid var(--primary-color);
}

.staged-container .staged-card:first-child {
    margin-top: 0;
}


/* Player Area */
#player-area {
  display: grid;
  grid-template-columns: 1fr 3fr 1fr; /* Deck, Hand, Discard */
  gap: 15px;
  align-items: center;
  padding: 15px;
  background-color: #222;
  border-radius: 12px;
  min-height: 150px;
}

#hand-container {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  min-height: 120px;
  min-width: 200px;
  background: rgba(0,0,0,0.2); /* Visual aid */
  border-radius: 8px;
}

/* Card Styling */
.card {
  width: 80px;
  height: 112px;
  background-color: var(--card-bg);
  color: var(--card-text);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  font-weight: bold;
  font-size: 1.2rem;
  box-shadow: 0 4px 6px rgba(0,0,0,0.3);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  user-select: none;
  position: relative;
  border: 2px solid transparent;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 12px rgba(0,0,0,0.4);
}

.card.selected {
  border-color: var(--primary-color);
  transform: translateY(-10px);
  box-shadow: 0 0 10px var(--primary-color);
}

.card.red {
  color: #d32f2f;
}

.card.black {
  color: #212121;
}

.card-back {
  background: repeating-linear-gradient(
    45deg,
    #3b28cc,
    #3b28cc 10px,
    #8f3bdf 10px,
    #8f3bdf 20px
  );

  box-shadow: inset 0 0 10px rgba(0,0,0,0.3);
  border: 2px solid rgba(255,255,255,0.2);
}

/* Covered Monster - ensure visual stacking */
.covered-monster, .top-monster {
    margin-top: -80px; /* Stack overlap */
}

/* First card (bottom of stack) should have no margin top */
.dungeon-col .card:first-child {
    margin-top: 0;
}

/* Monster Cards (J, Q, K) */
.monster {
  border: 2px solid var(--danger-color);
}

/* Piles (Deck, Discard, Clear) */
#power-deck-container,
#discard-pile-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 10px;
}

#undo-btn {
  width: 100%;
  padding: 8px 12px;
  font-size: 0.85rem;
  background-color: #444;
  border: 1px solid #555;
  color: #ccc;
}

#undo-btn:hover:not(:disabled) {
  background-color: #555;
  color: #fff;
}

#discard-pile {
  width: 80px;
  height: 112px;
  border: 2px dashed rgba(255, 255, 255, 0.3);
  border-radius: 8px;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8rem;
  background-color: rgba(0, 0, 0, 0.2);
  user-select: none;
  transition: all 0.2s ease;
}

#discard-pile:hover {
  border-color: rgba(255, 255, 255, 0.6);
  background-color: rgba(0, 0, 0, 0.4);
}

/* Deck Stack Effect */
/* Deck is now automatic, removing active click state */
#power-deck {
  width: 80px;
  height: 112px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 8px;
  /* Using .card-back for base style */
  position: relative;
  user-select: none;
}

/* Controls */
#controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 10px 15px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.2s;
}

button:hover:not(:disabled) {
  background-color: #535bf2;
}

button:disabled {
  background-color: #444;
  cursor: not-allowed;
  opacity: 0.7;
}

/* Modal */
.hidden {
  display: none !important;
}

#game-over-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background: #333;
  padding: 40px;
  border-radius: 12px;
  text-align: center;
}

.modal-content h2 {
    margin-top: 0;
    color: var(--primary-color);
}

/* Instructions Dialog */
#instructions-dialog {
    background: transparent;
    border: none;
    padding: 0;
    max-width: 600px;
    width: 90%;
}

#instructions-dialog::backdrop {
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(4px);
}

#instructions-dialog .modal-content {
    background: #222;
    border: 1px solid #444;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    text-align: left;
    padding: 30px;
}

#instructions-dialog h2 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 20px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.instructions-body {
    max-height: 60vh;
    overflow-y: auto;
    margin-bottom: 20px;
    padding-right: 10px;
}

.instructions-body h3 {
    color: var(--primary-color);
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 1.1rem;
    border-left: 3px solid var(--primary-color);
    padding-left: 10px;
}

.instructions-body p {
    line-height: 1.6;
    margin: 10px 0;
    color: #bbb;
}

.instructions-body ul {
    color: #bbb;
    padding-left: 20px;
}

.instructions-body li {
    margin-bottom: 8px;
}

#close-instructions-btn {
    display: block;
    margin: 0 auto;
    padding: 12px 30px;
}

#instructions-btn {
    margin-left: 10px;
    background: rgba(100, 108, 255, 0.1);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}

#instructions-btn:hover {
    background: var(--primary-color);
    color: white;
}