/* CSS Design System for Word Solitaire: Categories */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;800&display=swap');

:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #131a2e;
  --bg-card: rgba(30, 41, 59, 0.5);
  --bg-card-back: radial-gradient(circle, #312e81 0%, #1e1b4b 100%);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.4);
  
  --color-text: #f8fafc;
  --color-text-muted: #94a3b8;
  
  /* Primary Colors */
  --color-gold: #fbbf24;
  --color-gold-glow: rgba(251, 191, 36, 0.3);
  --color-success: #10b981;
  --color-success-glow: rgba(16, 185, 129, 0.2);
  --color-danger: #ef4444;
  
  /* Category colors */
  --cat-jewelry: #22d3ee;
  --cat-emotions: #f43f5e;
  --cat-festivals: #10b981;
  --cat-animals: #fb923c;
  --cat-space: #a855f7;
  --cat-weather: #3b82f6;
  --cat-vehicles: #eab308;
  --cat-food: #ec4899;
  --cat-sports: #6366f1;
  --cat-clothing: #14b8a6;
  --cat-gardening: #84cc16;
  --cat-mythology: #d946ef;
  --cat-ocean: #06b6d4;
  --cat-instruments: #f97316;
  --cat-science: #34d399;
  --cat-buildings: #a8a29e;
  --cat-flowers: #f472b6;
  --cat-insects: #a3e635;
  --cat-kitchen: #fb7185;
  --cat-toys: #60a5fa;
  --cat-birds: #38bdf8;
  --cat-geology: #b45309;
  --cat-art: #8b5cf6;
  --cat-trees: #15803d;
  --cat-math: #c084fc;
  --cat-deserts: #ca8a04;
  --cat-dance: #dc2626;
  --cat-games: #4f46e5;
  --cat-office: #64748b;
  --cat-time: #0284c7;
  
  /* Layout constraints */
  --card-aspect-ratio: 0.72;
  --card-max-width: 96px;
  --card-border-radius: 10px;
  
  /* Font Families */
  --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(at 0% 0%, rgba(30, 27, 75, 0.4) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(15, 23, 42, 0.6) 0px, transparent 50%),
    radial-gradient(at 50% 100%, rgba(49, 46, 129, 0.4) 0px, transparent 50%);
  color: var(--color-text);
  min-height: 100vh;
  min-height: -webkit-fill-available;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

html {
  height: -webkit-fill-available;
}

/* App Container */
.app-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  height: 100vh;
  padding: 12px 16px;
  justify-content: space-between;
}

/* Header Area */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 8px;
}

.title-section h1 {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  background: linear-gradient(to right, #ffffff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.title-section .subtitle {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.controls {
  display: flex;
  gap: 8px;
  align-items: center;
}

button.btn-icon {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--color-text);
  padding: 8px 10px;
  border-radius: 8px;
  font-family: var(--font-family);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
}

button.btn-icon:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

button.btn-icon:active:not(:disabled) {
  transform: translateY(0);
}

button.btn-icon:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* Game Info Bar */
.game-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  margin-bottom: 12px;
  backdrop-filter: blur(5px);
}

.info-item {
  display: flex;
  gap: 6px;
  align-items: center;
}

.info-label {
  color: var(--color-text-muted);
}

.info-value {
  font-weight: 600;
  color: var(--color-text);
}

/* Top Action Zone (Draw, Waste, Holding Slots) */
.top-zone {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px;
  align-items: start;
  margin-bottom: 12px;
  background: rgba(15, 23, 42, 0.2);
  padding: 10px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.deck-section {
  display: flex;
  gap: 12px;
}

.holding-section {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

.slot-title {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
  text-align: center;
  font-weight: 600;
}

.slot-container {
  display: flex;
  flex-direction: column;
}

/* Base Slot Placeholder */
.slot {
  aspect-ratio: var(--card-aspect-ratio);
  width: 14vw;
  max-width: var(--card-max-width);
  border: 2px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--card-border-radius);
  background: rgba(15, 23, 42, 0.3);
  position: relative;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4);
}

.slot.active-drop-zone {
  border-color: var(--color-gold);
  background: rgba(251, 191, 36, 0.05);
}

.slot-label {
  position: absolute;
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.15);
  font-weight: 800;
  letter-spacing: 0.5px;
  pointer-events: none;
}

.draw-pile {
  cursor: pointer;
}

.draw-pile.empty {
  cursor: default;
}

.draw-pile.empty::after {
  content: "↺";
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.2);
}

/* Tableau Area */
.tableau {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  flex-grow: 1;
  width: 100%;
  padding: 4px 0;
  position: relative;
}

/* When 5 or 6 categories are active, adjust grid dynamically */
.tableau.cols-5 {
  grid-template-columns: repeat(5, 1fr);
}

.tableau.cols-6 {
  grid-template-columns: repeat(6, 1fr);
}

.tableau-column {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  height: 100%;
  border-radius: var(--card-border-radius);
}

/* Category Anchor Header */
.category-anchor {
  width: 100%;
  aspect-ratio: var(--card-aspect-ratio);
  max-width: var(--card-max-width);
  border-radius: var(--card-border-radius);
  background: rgba(30, 41, 59, 0.3);
  border: 2px solid var(--border-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4px;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.2);
  position: relative;
  z-index: 1;
  transition: all 0.3s ease;
  margin-bottom: 12px;
}

.category-anchor .crown-icon {
  font-size: 1.2rem;
  margin-bottom: 2px;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.category-anchor .category-name {
  font-size: 0.6rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  word-break: break-all;
  line-height: 1.1;
}

/* Stack styling inside the column */
.card-stack {
  position: relative;
  width: 100%;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  /* Ensure stack drops target the column container */
  pointer-events: none; 
}

/* Re-enable pointer events on the column so drops work */
.tableau-column {
  pointer-events: auto;
}

/* Card Elements */
.card {
  aspect-ratio: var(--card-aspect-ratio);
  width: 14vw;
  max-width: var(--card-max-width);
  border-radius: var(--card-border-radius);
  position: absolute;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  cursor: grab;
  touch-action: none;
  z-index: 5;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  pointer-events: auto;
}

.card:active {
  cursor: grabbing;
}

/* Stacking vertical offset (solitaire overlap) */
/* Face down overlaps slightly less, face up slightly more so words are readable */
.card.face-down-offset {
  /* Offset applied in JS dynamically via transform style to ensure flexibility */
}

/* Face Down Style */
.card.face-down {
  background: var(--bg-card-back);
  border: 1px solid rgba(255, 255, 255, 0.12);
  cursor: default;
}

.card.face-down::before {
  content: "";
  position: absolute;
  top: 5px;
  bottom: 5px;
  left: 5px;
  right: 5px;
  border: 1px solid rgba(251, 191, 36, 0.15);
  border-radius: calc(var(--card-border-radius) - 4px);
  background-image: 
    linear-gradient(45deg, rgba(251, 191, 36, 0.05) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(251, 191, 36, 0.05) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(251, 191, 36, 0.05) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(251, 191, 36, 0.05) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}

/* Face Up Style */
.card.face-up {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border: 1.5px solid var(--border-color);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 6px;
  color: var(--color-text);
  overflow: hidden;
}

/* Category Indicators on Card */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.card-category-indicator {
  font-size: 0.55rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.8;
  padding: 1px 4px;
  border-radius: 4px;
  max-width: 75%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-category-icon {
  font-size: 0.65rem;
}

.card-word {
  font-size: 0.72rem;
  font-weight: 600;
  text-align: center;
  margin: auto 0;
  word-break: break-word;
  line-height: 1.2;
}

/* Highlight Selected Card (Tap-to-Move active state) */
.card.selected {
  border-color: var(--color-gold) !important;
  box-shadow: 0 0 14px var(--color-gold), 0 4px 10px rgba(0, 0, 0, 0.5) !important;
  transform: scale(1.03) !important;
  z-index: 100 !important;
}

/* Draggable helper styling during drag */
.card.dragging {
  opacity: 0.8;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.6) !important;
  z-index: 1000 !important;
  transform: scale(1.05) !important;
  transition: none !important;
}

/* Visual cue when card matches column anchor */
.card.matched {
  border-color: var(--color-success-glow);
  box-shadow: 0 0 6px var(--color-success-glow), inset 0 0 4px var(--color-success-glow);
}

/* Category Accent Styles */
.theme-jewelry { border-color: var(--cat-jewelry) !important; color: var(--cat-jewelry); }
.theme-emotions { border-color: var(--cat-emotions) !important; color: var(--cat-emotions); }
.theme-festivals { border-color: var(--cat-festivals) !important; color: var(--cat-festivals); }
.theme-animals { border-color: var(--cat-animals) !important; color: var(--cat-animals); }
.theme-space { border-color: var(--cat-space) !important; color: var(--cat-space); }
.theme-weather { border-color: var(--cat-weather) !important; color: var(--cat-weather); }
.theme-vehicles { border-color: var(--cat-vehicles) !important; color: var(--cat-vehicles); }
.theme-food { border-color: var(--cat-food) !important; color: var(--cat-food); }
.theme-sports { border-color: var(--cat-sports) !important; color: var(--cat-sports); }
.theme-clothing { border-color: var(--cat-clothing) !important; color: var(--cat-clothing); }
.theme-gardening { border-color: var(--cat-gardening) !important; color: var(--cat-gardening); }
.theme-mythology { border-color: var(--cat-mythology) !important; color: var(--cat-mythology); }
.theme-ocean { border-color: var(--cat-ocean) !important; color: var(--cat-ocean); }
.theme-instruments { border-color: var(--cat-instruments) !important; color: var(--cat-instruments); }
.theme-science { border-color: var(--cat-science) !important; color: var(--cat-science); }
.theme-buildings { border-color: var(--cat-buildings) !important; color: var(--cat-buildings); }
.theme-flowers { border-color: var(--cat-flowers) !important; color: var(--cat-flowers); }
.theme-insects { border-color: var(--cat-insects) !important; color: var(--cat-insects); }
.theme-kitchen { border-color: var(--cat-kitchen) !important; color: var(--cat-kitchen); }
.theme-toys { border-color: var(--cat-toys) !important; color: var(--cat-toys); }
.theme-birds { border-color: var(--cat-birds) !important; color: var(--cat-birds); }
.theme-geology { border-color: var(--cat-geology) !important; color: var(--cat-geology); }
.theme-art { border-color: var(--cat-art) !important; color: var(--cat-art); }
.theme-trees { border-color: var(--cat-trees) !important; color: var(--cat-trees); }
.theme-math { border-color: var(--cat-math) !important; color: var(--cat-math); }
.theme-deserts { border-color: var(--cat-deserts) !important; color: var(--cat-deserts); }
.theme-dance { border-color: var(--cat-dance) !important; color: var(--cat-dance); }
.theme-games { border-color: var(--cat-games) !important; color: var(--cat-games); }
.theme-office { border-color: var(--cat-office) !important; color: var(--cat-office); }
.theme-time { border-color: var(--cat-time) !important; color: var(--cat-time); }

.bg-jewelry { background-color: rgba(34, 211, 238, 0.15) !important; color: #e0f7fa !important; }
.bg-emotions { background-color: rgba(244, 63, 94, 0.15) !important; color: #ffe4e6 !important; }
.bg-festivals { background-color: rgba(16, 185, 129, 0.15) !important; color: #d1fae5 !important; }
.bg-animals { background-color: rgba(251, 146, 60, 0.15) !important; color: #ffedd5 !important; }
.bg-space { background-color: rgba(168, 85, 247, 0.15) !important; color: #f3e8ff !important; }
.bg-weather { background-color: rgba(59, 130, 246, 0.15) !important; color: #dbeafe !important; }
.bg-vehicles { background-color: rgba(234, 179, 8, 0.15) !important; color: #fef9c3 !important; }
.bg-food { background-color: rgba(236, 72, 153, 0.15) !important; color: #fce7f3 !important; }
.bg-sports { background-color: rgba(99, 102, 241, 0.15) !important; color: #e0e7ff !important; }
.bg-clothing { background-color: rgba(20, 184, 166, 0.15) !important; color: #ccfbf1 !important; }
.bg-gardening { background-color: rgba(132, 204, 22, 0.15) !important; color: #ecfccb !important; }
.bg-mythology { background-color: rgba(217, 70, 239, 0.15) !important; color: #fdf4ff !important; }
.bg-ocean { background-color: rgba(6, 182, 212, 0.15) !important; color: #ecfeff !important; }
.bg-instruments { background-color: rgba(249, 115, 22, 0.15) !important; color: #fff7ed !important; }
.bg-science { background-color: rgba(52, 211, 153, 0.15) !important; color: #e6fffa !important; }
.bg-buildings { background-color: rgba(168, 162, 158, 0.15) !important; color: #f5f5f4 !important; }
.bg-flowers { background-color: rgba(244, 114, 182, 0.15) !important; color: #fdf2f8 !important; }
.bg-insects { background-color: rgba(163, 230, 53, 0.15) !important; color: #f7fee7 !important; }
.bg-kitchen { background-color: rgba(251, 113, 133, 0.15) !important; color: #fff1f2 !important; }
.bg-toys { background-color: rgba(96, 165, 250, 0.15) !important; color: #eff6ff !important; }
.bg-birds { background-color: rgba(56, 189, 248, 0.15) !important; color: #f0f9ff !important; }
.bg-geology { background-color: rgba(180, 83, 9, 0.15) !important; color: #fef3c7 !important; }
.bg-art { background-color: rgba(139, 92, 246, 0.15) !important; color: #f5f3ff !important; }
.bg-trees { background-color: rgba(21, 128, 61, 0.15) !important; color: #f0fdf4 !important; }
.bg-math { background-color: rgba(192, 132, 252, 0.15) !important; color: #faf5ff !important; }
.bg-deserts { background-color: rgba(202, 138, 4, 0.15) !important; color: #fef9c3 !important; }
.bg-dance { background-color: rgba(220, 38, 38, 0.15) !important; color: #fef2f2 !important; }
.bg-games { background-color: rgba(79, 70, 229, 0.15) !important; color: #e0e7ff !important; }
.bg-office { background-color: rgba(100, 116, 139, 0.15) !important; color: #f8fafc !important; }
.bg-time { background-color: rgba(2, 132, 199, 0.15) !important; color: #f0f9ff !important; }

/* Match colors for Anchors */
.anchor-jewelry { border-color: var(--cat-jewelry); background: rgba(34, 211, 238, 0.08); color: var(--cat-jewelry); }
.anchor-emotions { border-color: var(--cat-emotions); background: rgba(244, 63, 94, 0.08); color: var(--cat-emotions); }
.anchor-festivals { border-color: var(--cat-festivals); background: rgba(16, 185, 129, 0.08); color: var(--cat-festivals); }
.anchor-animals { border-color: var(--cat-animals); background: rgba(251, 146, 60, 0.08); color: var(--cat-animals); }
.anchor-space { border-color: var(--cat-space); background: rgba(168, 85, 247, 0.08); color: var(--cat-space); }
.anchor-weather { border-color: var(--cat-weather); background: rgba(59, 130, 246, 0.08); color: var(--cat-weather); }
.anchor-vehicles { border-color: var(--cat-vehicles); background: rgba(234, 179, 8, 0.08); color: var(--cat-vehicles); }
.anchor-food { border-color: var(--cat-food); background: rgba(236, 72, 153, 0.08); color: var(--cat-food); }
.anchor-sports { border-color: var(--cat-sports); background: rgba(99, 102, 241, 0.08); color: var(--cat-sports); }
.anchor-clothing { border-color: var(--cat-clothing); background: rgba(20, 184, 166, 0.08); color: var(--cat-clothing); }
.anchor-gardening { border-color: var(--cat-gardening); background: rgba(132, 204, 22, 0.08); color: var(--cat-gardening); }
.anchor-mythology { border-color: var(--cat-mythology); background: rgba(217, 70, 239, 0.08); color: var(--cat-mythology); }
.anchor-ocean { border-color: var(--cat-ocean); background: rgba(6, 182, 212, 0.08); color: var(--cat-ocean); }
.anchor-instruments { border-color: var(--cat-instruments); background: rgba(249, 115, 22, 0.08); color: var(--cat-instruments); }
.anchor-science { border-color: var(--cat-science); background: rgba(52, 211, 153, 0.08); color: var(--cat-science); }
.anchor-buildings { border-color: var(--cat-buildings); background: rgba(168, 162, 158, 0.08); color: var(--cat-buildings); }
.anchor-flowers { border-color: var(--cat-flowers); background: rgba(244, 114, 182, 0.08); color: var(--cat-flowers); }
.anchor-insects { border-color: var(--cat-insects); background: rgba(163, 230, 53, 0.08); color: var(--cat-insects); }
.anchor-kitchen { border-color: var(--cat-kitchen); background: rgba(251, 113, 133, 0.08); color: var(--cat-kitchen); }
.anchor-toys { border-color: var(--cat-toys); background: rgba(96, 165, 250, 0.08); color: var(--cat-toys); }
.anchor-birds { border-color: var(--cat-birds); background: rgba(56, 189, 248, 0.08); color: var(--cat-birds); }
.anchor-geology { border-color: var(--cat-geology); background: rgba(180, 83, 9, 0.08); color: var(--cat-geology); }
.anchor-art { border-color: var(--cat-art); background: rgba(139, 92, 246, 0.08); color: var(--cat-art); }
.anchor-trees { border-color: var(--cat-trees); background: rgba(21, 128, 61, 0.08); color: var(--cat-trees); }
.anchor-math { border-color: var(--cat-math); background: rgba(192, 132, 252, 0.08); color: var(--cat-math); }
.anchor-deserts { border-color: var(--cat-deserts); background: rgba(202, 138, 4, 0.08); color: var(--cat-deserts); }
.anchor-dance { border-color: var(--cat-dance); background: rgba(220, 38, 38, 0.08); color: var(--cat-dance); }
.anchor-games { border-color: var(--cat-games); background: rgba(79, 70, 229, 0.08); color: var(--cat-games); }
.anchor-office { border-color: var(--cat-office); background: rgba(100, 116, 139, 0.08); color: var(--cat-office); }
.anchor-time { border-color: var(--cat-time); background: rgba(2, 132, 199, 0.08); color: var(--cat-time); }

.anchor-pure {
  box-shadow: 0 0 10px var(--border-glow), inset 0 0 10px rgba(99, 102, 241, 0.1);
  background: rgba(99, 102, 241, 0.12) !important;
}

/* Modals & Overlay Screens */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(7, 10, 18, 0.85);
  backdrop-filter: blur(8px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  padding: 20px;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: rgba(19, 26, 46, 0.95);
  border: 1.5px solid var(--border-color);
  border-radius: 16px;
  width: 100%;
  max-width: 460px;
  padding: 30px;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6);
  text-align: center;
  transform: scale(0.9);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
}

.modal-overlay.open .modal-content {
  transform: scale(1);
}

.modal-content::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(to right, #6366f1, #a855f7, #ec4899);
}

.modal-title {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.modal-subtitle {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

/* Difficulty Button Layout */
.difficulty-selector {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.btn-choice {
  background: rgba(255, 255, 255, 0.03);
  border: 1.5px solid var(--border-color);
  color: var(--color-text);
  padding: 14px 20px;
  border-radius: 12px;
  font-family: var(--font-family);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s ease;
  text-align: left;
}

.btn-choice span.label {
  display: flex;
  flex-direction: column;
}

.btn-choice span.diff-name {
  font-weight: 800;
}

.btn-choice span.diff-desc {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  font-weight: 400;
  margin-top: 2px;
}

.btn-choice span.badge {
  background: rgba(255, 255, 255, 0.06);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
}

.btn-choice:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

.btn-choice:active {
  transform: translateY(0);
}

/* Standard Modal Buttons */
.btn-primary {
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  border: none;
  color: var(--color-text);
  padding: 12px 28px;
  border-radius: 10px;
  font-family: var(--font-family);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
  filter: brightness(1.1);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Instructions Modal */
.instructions-list {
  text-align: left;
  margin: 16px 0 24px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.instructions-list li {
  list-style: none;
  position: relative;
  padding-left: 20px;
}

.instructions-list li::before {
  content: "✦";
  position: absolute;
  left: 0;
  color: var(--color-gold);
}

.instructions-list strong {
  color: var(--color-text);
}

.modal-close-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-size: 1.2rem;
  cursor: pointer;
}

.modal-close-btn:hover {
  color: var(--color-text);
}

/* Win Screen Layout */
.win-icon {
  font-size: 3.5rem;
  margin-bottom: 12px;
  animation: bounce 2s infinite ease;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 20px 0 26px;
}

.stat-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  padding: 10px;
  border-radius: 8px;
}

.stat-box .num {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-gold);
}

.stat-box .lbl {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

/* Canvas Confetti */
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

/* Shake Animation for Invalid Moves */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.shake {
  animation: shake 0.35s ease-in-out;
}

/* Card flip animation style classes */
.card.flipping {
  transform: rotateY(90deg) scale(0.9);
  transition: transform 0.15s ease-in;
}

/* Bounce for Win */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Responsiveness Settings */
/* For medium sized screens like tablets */
@media (max-width: 768px) {
  .app-container {
    padding: 8px 10px;
  }
  
  header {
    padding-bottom: 6px;
    margin-bottom: 6px;
  }
  
  .title-section h1 {
    font-size: 1.1rem;
  }
  
  .top-zone {
    gap: 8px;
    padding: 6px;
    margin-bottom: 8px;
  }
  
  .slot {
    width: 13.5vw;
  }
  
  .card {
    width: 13.5vw;
  }
  
  .category-anchor {
    max-width: none;
    padding: 2px;
  }
  
  .category-anchor .crown-icon {
    font-size: 1rem;
  }
  
  .category-anchor .category-name {
    font-size: 0.55rem;
  }
  
  .card-word {
    font-size: 0.65rem;
  }
}

/* Small phone layout adjustments */
@media (max-width: 480px) {
  .app-container {
    padding: 6px 8px;
  }
  
  .controls button span {
    display: none; /* Hide button text, icons only */
  }
  
  button.btn-icon {
    padding: 6px 8px;
  }
  
  .top-zone {
    margin-bottom: 6px;
    padding: 5px;
  }
  
  .slot {
    width: 13vw;
  }
  
  .card {
    width: 13vw;
  }
  
  .card-category-indicator {
    display: none; /* Hide label on small phone cards */
  }
  
  .card-category-icon {
    font-size: 0.6rem;
  }
  
  .card-header {
    justify-content: flex-end; /* Align icon right */
  }
  
  .card-word {
    font-size: 0.58rem;
  }
  
  .card.face-up {
    padding: 4px;
  }
}