:root {
  --bg-color: #f5f7fa;
  --panel-bg: #ffffff;
  --text-primary: #2c3e50;
  --text-secondary: #7f8c8d;
  --border-color: #e2e8f0;
  
  --suit-black: #2c3e50;
  --suit-red: #e74c3c;
  
  --card-bg: #ffffff;
  --card-border: #dcdde1;
  
  --win-color: #27ae60;
  --lose-color: #e74c3c;
  --tie-color: #f39c12;
  
  --primary-color: #3498db;
  --primary-hover: #2980b9;
  --danger-color: #e74c3c;
  --danger-hover: #c0392b;
  --secondary-color: #95a5a6;
}

[data-theme="dark"] {
  --bg-color: #1a1e23;
  --panel-bg: #2c3036;
  --text-primary: #ecf0f1;
  --text-secondary: #bdc3c7;
  --border-color: #4a5568;
  
  --suit-black: #ecf0f1;
  --suit-red: #ff7675;
  
  --card-bg: #34495e;
  --card-border: #2c3e50;
  
  --win-color: #2ecc71;
  --lose-color: #ff7675;
  --tie-color: #f1c40f;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  transition: background-color 0.3s, color 0.3s;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

header h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
}

header p {
  color: var(--text-secondary);
}

.container {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 25px;
  max-width: 1200px;
  margin: 0 auto;
}

/* 兩大區域 */
.left-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.right-panel {
  display: flex;
  flex-direction: column;
}

.card-box {
  background-color: var(--panel-bg);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
}

.card-box h3, section h2 {
  margin-bottom: 15px;
  font-size: 1.2rem;
  color: var(--text-primary);
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 8px;
}

/* 結果區 */
.result-dashboard {
  background-color: var(--panel-bg);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--border-color);
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
  margin-bottom: 20px;
}

.result-item {
  text-align: center;
  background: var(--bg-color);
  padding: 10px;
  border-radius: 8px;
}

.result-item .label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 5px;
}

.result-item .value {
  display: block;
  font-size: 1.4rem;
  font-weight: bold;
}

.final-result-card {
  text-align: center;
  padding: 20px;
  border-radius: 8px;
  background: var(--bg-color);
  transition: all 0.3s;
  border: 2px solid transparent;
}

.final-title {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.final-amount {
  font-size: 2.2rem;
  font-weight: bold;
  letter-spacing: 1px;
}

.final-hint {
  margin-top: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.final-result-card.win {
  background-color: rgba(39, 174, 96, 0.1);
  border-color: var(--win-color);
  color: var(--win-color);
}

.final-result-card.lose {
  background-color: rgba(231, 76, 60, 0.1);
  border-color: var(--lose-color);
  color: var(--lose-color);
}

.final-result-card.tie {
  background-color: rgba(243, 156, 18, 0.1);
  border-color: var(--tie-color);
  color: var(--tie-color);
}

/* 控制區 */
.control-group {
  margin-bottom: 15px;
}
.control-group label {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 5px;
}
.control-group input {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-size: 1.1rem;
}

.button-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.button-group > :last-child {
  grid-column: 1 / span 2;
}

.btn {
  padding: 10px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.2s;
  color: white;
}
.btn:hover {
  transform: translateY(-2px);
}
.btn:active {
  transform: translateY(0);
}
.btn-primary { background-color: var(--primary-color); }
.btn-primary:hover { background-color: var(--primary-hover); }

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

.btn-secondary { background-color: var(--secondary-color); }
.btn-secondary:hover { opacity: 0.9; }

/* 摘要區 */
.empty-state {
  color: var(--text-secondary);
  text-align: center;
  padding: 20px 0;
  font-style: italic;
}
.selected-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 15px;
  min-height: 50px;
}
.mini-card {
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  font-weight: bold;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}
.mini-card:hover {
  text-decoration: line-through;
  opacity: 0.7;
}
.mini-card.black { color: var(--suit-black); }
.mini-card.red { color: var(--suit-red); }

.selected-stats {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.stat-badge {
  background: var(--bg-color);
  padding: 3px 8px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

/* 選牌區 */
.section-header {
  margin-bottom: 15px;
}

.deck-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
  gap: 12px;
  background-color: var(--panel-bg);
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
}

.poker-card {
  aspect-ratio: 2.5 / 3.5;
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 6px;
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0,0,0,0.06);
  transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
  user-select: none;
}

.poker-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 12px rgba(0,0,0,0.1);
}

.poker-card.selected {
  border-color: var(--primary-color);
  background-color: rgba(52, 152, 219, 0.1);
  transform: scale(0.95);
  box-shadow: 0 0 0 2px var(--primary-color);
}

.poker-card.black { color: var(--suit-black); }
.poker-card.red { color: var(--suit-red); }

.card-top {
  align-self: flex-start;
  line-height: 1;
  font-size: 1.1rem;
  font-weight: bold;
}
.card-center {
  align-self: center;
  font-size: 2rem;
  line-height: 1;
}
.card-bottom {
  align-self: flex-end;
  line-height: 1;
  transform: rotate(180deg);
  font-size: 1.1rem;
  font-weight: bold;
}

.selected-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(52, 152, 219, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-size: 2.5rem;
  font-weight: bold;
  opacity: 0;
  transition: opacity 0.2s;
}

.poker-card.selected .selected-overlay {
  opacity: 1;
}

/* Toast */
#toast-container {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background-color: rgba(44, 62, 80, 0.9);
  color: white;
  padding: 12px 24px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  font-weight: bold;
  animation: slideDown 0.3s ease-out forwards;
  opacity: 1;
  transition: opacity 0.5s;
}
.toast.hide {
  opacity: 0;
}

@keyframes slideDown {
  from { transform: translateY(-20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* RWD */
@media (max-width: 900px) {
  .container {
    grid-template-columns: 1fr;
  }
  .left-panel {
    order: -1;
  }
}

@media (max-width: 480px) {
  .deck-grid {
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    padding: 15px;
    gap: 8px;
  }
  .card-center {
    font-size: 1.5rem;
  }
  .card-top, .card-bottom {
    font-size: 0.9rem;
  }
}