/* ==========================================================================
   DESIGN SYSTEM & VARIABLES
   ========================================================================== */
:root {
  --font-title: 'Fredoka', 'Comfortaa', sans-serif;
  --font-body: 'Nunito', sans-serif;

  /* Colors */
  --bg-primary: #FFF9F4;      /* Creamy soft background */
  --bg-card: #FFFFFF;
  --text-dark: #3A2E2B;      /* Warm soft charcoal */
  --text-muted: #7A6D6A;     /* Muted grey-brown */
  
  --color-orange: #FF8A5B;   /* Primary warm orange */
  --color-orange-light: #FFECE3;
  --color-peach: #FFAE85;    /* Warm coral peach */
  --color-peach-light: #FFF0E6;
  --color-teal: #5EC3C6;     /* Playful teal */
  --color-teal-light: #E8F8F8;
  --color-purple: #8B8BE8;   /* Soft lavender purple */
  --color-purple-light: #F0F0FC;
  --color-yellow: #FFCE54;   /* Star yellow */
  --color-yellow-light: #FFF9E6;
  --color-red: #FC5C65;      /* Warm red */

  /* Borders & Shadows */
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 32px;
  --radius-round: 50%;
  
  --shadow-sm: 0 4px 12px rgba(58, 46, 43, 0.05);
  --shadow-md: 0 12px 28px rgba(58, 46, 43, 0.08);
  --shadow-lg: 0 20px 48px rgba(58, 46, 43, 0.12);
  --shadow-hover: 0 24px 56px rgba(58, 46, 43, 0.16);

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-slow: 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

/* ==========================================================================
   GLOBAL STYLES & RESET
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-dark);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Rounded, friendly scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--color-peach);
  border-radius: 20px;
  border: 2px solid var(--bg-primary);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-orange);
}

button, [role="button"] {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
  transition: all var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1, h2, h3, h4 {
  font-family: var(--font-title);
  font-weight: 700;
  color: var(--text-dark);
}

/* Utility background colors */
.bg-cream { background-color: var(--bg-card); }
.bg-peach { background-color: var(--color-peach-light); }
.bg-teal { background-color: var(--color-teal-light); }
.bg-purple { background-color: var(--color-purple-light); }
.bg-yellow { background-color: var(--color-yellow-light); }

.hidden {
  display: none !important;
}

/* ==========================================================================
   KEYFRAME ANIMATIONS
   ========================================================================== */
@keyframes float {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-12px) rotate(1.5deg); }
  100% { transform: translateY(0px) rotate(0deg); }
}

@keyframes cloudShadow {
  0% { transform: scale(1); opacity: 0.4; }
  50% { transform: scale(0.9); opacity: 0.2; }
  100% { transform: scale(1); opacity: 0.4; }
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

@keyframes slideIn {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes winStarPop {
  0% { transform: scale(0) rotate(-45deg); opacity: 0; }
  70% { transform: scale(1.2) rotate(10deg); }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}

/* Animation utilities */
.floating-anim {
  animation: float 5s ease-in-out infinite;
}

.pulse-anim {
  animation: pulse 2s infinite ease-in-out;
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
.main-header {
  background-color: rgba(255, 250, 246, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 2px solid rgba(255, 174, 133, 0.15);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Logo */
.logo {
  display: flex;
  aria-label: "Home logo";
  align-items: center;
  gap: 12px;
  user-select: none;
}
.logo:hover .logo-img {
  transform: rotate(-8deg) scale(1.08);
}
.logo-img {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-round);
  background-color: var(--color-peach-light);
  border: 2px solid var(--color-peach);
  object-fit: cover;
  transition: transform var(--transition-normal);
}
.logo-text {
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-orange);
  text-shadow: 1px 1px 0 rgba(255, 255, 255, 0.8);
}

/* Navigation Links */
.main-nav {
  display: flex;
  gap: 8px;
}
.nav-link {
  padding: 10px 18px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  transition: all var(--transition-fast);
}
.nav-link:hover {
  color: var(--color-orange);
  background-color: var(--color-orange-light);
}
.nav-link.active {
  color: #FFFFFF;
  background-color: var(--color-orange);
  box-shadow: var(--shadow-sm);
}

/* Header Controls */
.header-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Sound Button */
.control-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-round);
  background-color: #FFFFFF;
  border: 2px solid var(--color-peach-light);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-orange);
  transition: all var(--transition-normal);
}
.control-btn:hover {
  transform: scale(1.1);
  background-color: var(--color-orange-light);
  border-color: var(--color-peach);
}
.sound-icon {
  width: 20px;
  height: 20px;
}

/* Language Selection */
.lang-selector {
  display: flex;
  background-color: #FFFFFF;
  border: 2px solid var(--color-peach-light);
  border-radius: var(--radius-md);
  padding: 3px;
  box-shadow: var(--shadow-sm);
}
.lang-btn {
  padding: 6px 12px;
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
}
.lang-btn.active {
  color: #FFFFFF;
  background-color: var(--color-teal);
}
.lang-btn:hover:not(.active) {
  color: var(--color-teal);
  background-color: var(--color-teal-light);
}

/* ==========================================================================
   APP SCREENS CONTAINER
   ========================================================================== */
.app-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 80px 24px;
}

.app-screen {
  display: none;
  animation: slideIn 0.5s ease-out forwards;
}

.app-screen.active {
  display: block;
}

.subscreen {
  display: none;
  animation: slideIn 0.4s ease-out forwards;
}

.subscreen.active {
  display: block;
}

/* ==========================================================================
   SCREEN 1: HOME PAGE
   ========================================================================== */
.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 60px;
}

.hero-text-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

#hero-main-title {
  font-size: 3.2rem;
  line-height: 1.15;
  color: var(--text-dark);
}
#hero-main-title::first-line {
  color: var(--color-orange);
}

.hero-description {
  font-size: 1.35rem;
  color: var(--text-muted);
  font-weight: 600;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-top: 10px;
}

.primary-btn {
  padding: 16px 32px;
  font-size: 1.2rem;
  font-weight: 800;
  color: #FFFFFF;
  background-color: var(--color-orange);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 20px rgba(255, 138, 91, 0.35);
  border-bottom: 4px solid #DF683B;
  transition: all var(--transition-fast);
}
.primary-btn:hover {
  transform: translateY(-2px);
  background-color: #FFA37E;
  box-shadow: 0 12px 24px rgba(255, 138, 91, 0.45);
}
.primary-btn:active {
  transform: translateY(2px);
  border-bottom-width: 1px;
}

.secondary-btn {
  padding: 16px 32px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-orange);
  background-color: #FFFFFF;
  border: 2px solid var(--color-orange);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}
.secondary-btn:hover {
  transform: translateY(-2px);
  background-color: var(--color-orange-light);
  box-shadow: var(--shadow-md);
}
.secondary-btn:active {
  transform: translateY(1px);
}

.hero-image-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-luna-img {
  width: 100%;
  max-width: 420px;
  border-radius: var(--radius-round);
  border: 10px solid #FFFFFF;
  box-shadow: var(--shadow-lg);
  z-index: 1;
}
.cloud-shadow {
  position: absolute;
  bottom: -25px;
  width: 70%;
  height: 20px;
  background-color: #E2D6CE;
  border-radius: var(--radius-round);
  filter: blur(10px);
  animation: cloudShadow 5s ease-in-out infinite;
}

/* Home Explore Cards */
.home-previews {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.section-title {
  font-size: 2.2rem;
  text-align: center;
  margin-bottom: 10px;
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: -8px;
  margin-bottom: 40px;
  font-weight: 600;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.preview-card {
  padding: 32px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 16px;
  border: 2px solid transparent;
  transition: all var(--transition-normal);
}
.preview-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}
.preview-card.bg-peach:hover { border-color: var(--color-peach); }
.preview-card.bg-purple:hover { border-color: var(--color-purple); }
.preview-card.bg-teal:hover { border-color: var(--color-teal); }

.preview-icon {
  font-size: 3.5rem;
  line-height: 1;
}

.preview-card h3 {
  font-size: 1.5rem;
}
.preview-card p {
  color: var(--text-muted);
  font-size: 1.05rem;
  font-weight: 600;
  flex-grow: 1;
}

.preview-action {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1.1rem;
  align-self: flex-start;
  transition: transform var(--transition-fast);
}
.bg-peach .preview-action { color: var(--color-orange); }
.bg-purple .preview-action { color: var(--color-purple); }
.bg-teal .preview-action { color: var(--color-teal); }

.preview-card:hover .preview-action {
  transform: translateX(6px);
}

/* ==========================================================================
   SCREEN 2: GAMES
   ========================================================================== */
.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 30px;
}

.game-card {
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  transition: all var(--transition-normal);
}
.game-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.game-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background-color: var(--bg-primary);
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border: 1px solid rgba(58, 46, 43, 0.1);
  z-index: 2;
}
.game-card.bg-yellow .game-badge { background-color: var(--color-yellow-light); color: #B58600; }
.game-card.bg-peach .game-badge { background-color: var(--color-peach-light); color: var(--color-orange); }
.game-card.bg-teal .game-badge { background-color: var(--color-teal-light); color: #2B7A7C; }

.game-thumbnail-wrapper {
  border-radius: var(--radius-md);
  overflow: hidden;
  height: 200px;
  background-color: var(--bg-primary);
  border: 2px solid rgba(58, 46, 43, 0.05);
}
.game-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.game-card:hover .game-thumbnail {
  transform: scale(1.06);
}

.game-card h3 {
  font-size: 1.4rem;
}
.game-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
  flex-grow: 1;
}

.play-game-btn {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 1.1rem;
  color: #FFFFFF;
  text-align: center;
  border-bottom: 3px solid rgba(0, 0, 0, 0.15);
}
.game-card.bg-yellow .play-game-btn { background-color: var(--color-yellow); border-bottom-color: #D6A325; color: #5C4A18; }
.game-card.bg-peach .play-game-btn { background-color: var(--color-orange); border-bottom-color: #D36C40; }
.game-card.bg-teal .play-game-btn { background-color: var(--color-teal); border-bottom-color: #3B9294; }

.game-card.bg-yellow .play-game-btn:hover { background-color: #FFE187; }
.game-card.bg-peach .play-game-btn:hover { background-color: #FFA57D; }
.game-card.bg-teal .play-game-btn:hover { background-color: #83DFE2; }

/* Game Play Workspace Commons */
.game-play-container {
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-lg);
  border: 3px solid var(--color-peach-light);
}

.back-btn {
  padding: 8px 18px;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-orange);
  background-color: var(--color-orange-light);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
}
.back-btn:hover {
  background-color: var(--color-peach);
  color: #FFFFFF;
}
.back-btn .arrow {
  font-size: 1.1rem;
}

.game-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
}

.game-layout-centered {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.game-controls-sidebar {
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid rgba(58, 46, 43, 0.08);
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.game-controls-sidebar h3 {
  font-size: 1.15rem;
  border-bottom: 2px solid rgba(58, 46, 43, 0.08);
  padding-bottom: 8px;
  margin-bottom: 4px;
}

.sidebar-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.sidebar-group label {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-dark);
}

.action-btn {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 1rem;
  color: #FFFFFF;
  text-align: center;
  border-bottom: 3px solid rgba(0, 0, 0, 0.15);
  box-shadow: var(--shadow-sm);
}
.action-btn:active {
  transform: translateY(2px);
  border-bottom-width: 1px;
}
.action-btn.bg-orange { background-color: var(--color-orange); border-bottom-color: #D36C40; }
.action-btn.bg-red { background-color: var(--color-red); border-bottom-color: #C2424A; }
.action-btn.bg-teal { background-color: var(--color-teal); border-bottom-color: #3B9294; }
.action-btn.bg-green { background-color: #2ecc71; border-bottom-color: #27ae60; color: #FFFFFF; }

.action-btn.bg-orange:hover { background-color: #FFA57D; }
.action-btn.bg-red:hover { background-color: #FF878D; }
.action-btn.bg-teal:hover { background-color: #83DFE2; }
.action-btn.bg-green:hover { background-color: #40e08f; }

/* 1. Puzzle Subgame Specifics */
.puzzle-board-wrapper {
  background-color: var(--color-peach-light);
  border-radius: var(--radius-md);
  border: 4px dashed var(--color-peach);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  overflow: hidden;
  box-shadow: inset 0 4px 12px rgba(58, 46, 43, 0.05);
}

.puzzle-board {
  width: 400px;
  height: 400px;
  position: relative;
  background-color: rgba(255, 255, 255, 0.5);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

/* A grid outline of target spots on the board */
.puzzle-grid-overlay {
  display: grid;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  pointer-events: none;
}
.puzzle-grid-cell {
  border: 1px dashed rgba(58, 46, 43, 0.2);
}

/* Individual slots on the board */
.puzzle-slot {
  position: absolute;
  border: 1px dashed rgba(58, 46, 43, 0.15);
  box-sizing: border-box;
}

/* Puzzle tray where pieces spawn */
.puzzle-tray {
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  border: 2px solid rgba(58, 46, 43, 0.08);
  min-height: 120px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 20px;
  justify-content: center;
  align-items: center;
  margin-top: 24px;
}

/* Individual draggable puzzle pieces */
.puzzle-piece {
  width: 100px;
  height: 100px;
  cursor: grab;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  background-size: 400px 400px; /* Scaled dynamically in JS based on puzzle size */
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-sizing: border-box;
  touch-action: none; /* Crucial for custom touch handling */
}
.puzzle-piece:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}
.puzzle-piece.dragging {
  cursor: grabbing;
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
  opacity: 0.9;
  z-index: 50;
}
.puzzle-piece.placed {
  cursor: default;
  box-shadow: none;
  border: none;
  transform: none !important;
}

/* Difficulty Selector Group */
.difficulty-selector {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.diff-btn {
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 700;
  text-align: left;
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  border: 2px solid rgba(58, 46, 43, 0.08);
  color: var(--text-muted);
}
.diff-btn:hover:not(.active) {
  border-color: var(--color-peach);
  color: var(--text-dark);
  background-color: var(--color-peach-light);
}
.diff-btn.active {
  background-color: var(--color-peach);
  border-color: var(--color-peach);
  color: #FFFFFF;
}

/* Side pic selector grid */
.puzzle-img-select-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
.puzzle-img-option {
  height: 60px;
  border-radius: var(--radius-sm);
  background-size: cover;
  background-position: center;
  border: 3px solid #FFFFFF;
  box-shadow: var(--shadow-sm);
}
.puzzle-img-option:hover {
  transform: scale(1.05);
}
.puzzle-img-option.active {
  border-color: var(--color-orange);
  box-shadow: var(--shadow-md);
}

/* 2. Coloring Subgame Specifics */
.custom-select {
  padding: 10px 14px;
  font-size: 0.95rem;
  font-family: inherit;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: 2px solid rgba(58, 46, 43, 0.08);
  background-color: #FFFFFF;
  color: var(--text-dark);
  outline: none;
}
.custom-select:focus {
  border-color: var(--color-peach);
}

.mode-selector {
  display: flex;
  gap: 8px;
}
.tool-btn {
  flex: 1;
  padding: 12px 8px;
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  border: 2px solid rgba(58, 46, 43, 0.08);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.tool-btn:hover:not(.active) {
  border-color: var(--color-peach);
  background-color: var(--color-peach-light);
}
.tool-btn.active {
  background-color: var(--color-teal);
  border-color: var(--color-teal);
  color: #FFFFFF;
}
.tool-icon {
  font-size: 1.5rem;
}

.custom-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 5px;
  background: rgba(58, 46, 43, 0.1);
  outline: none;
}
.custom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-teal);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.1s;
}
.custom-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.flex-column {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.color-palette-container {
  background-color: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  border: 1px solid rgba(58, 46, 43, 0.08);
}
.color-palette {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.color-dot {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-round);
  border: 3px solid #FFFFFF;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
}
.color-dot:hover {
  transform: scale(1.15);
}
.color-dot.active {
  transform: scale(1.25);
  border-color: var(--text-dark);
  box-shadow: var(--shadow-md);
}

.canvas-container {
  background-color: #FFFFFF;
  border: 4px solid var(--color-peach-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 100%;
}
#coloring-canvas {
  background-color: #FFFFFF;
  cursor: crosshair;
  max-width: 100%;
  height: auto;
  display: block;
}

/* 3. Memory Subgame Specifics */
.memory-header {
  display: flex;
  width: 100%;
  max-width: 500px;
  justify-content: space-between;
  align-items: center;
  background-color: var(--color-teal-light);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(94, 195, 198, 0.2);
}
.score-box {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1.1rem;
  color: #1F5A5C;
}
.score-box span {
  font-weight: 800;
}
.action-btn-small {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: 0.9rem;
  color: #FFFFFF;
  border-bottom: 2px solid rgba(0, 0, 0, 0.15);
}
.action-btn-small:active {
  transform: translateY(2px);
  border-bottom-width: 1px;
}
.action-btn-small.bg-orange {
  background-color: var(--color-orange);
  border-bottom-color: #D36C40;
}
.action-btn-small.bg-orange:hover {
  background-color: #FFA57D;
}

.memory-board-wrapper {
  perspective: 1000px;
}

.memory-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: 100%;
  max-width: 520px;
}

/* Card structures using 3D Flip */
.memory-card {
  width: 110px;
  height: 110px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.memory-card.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--radius-md);
  border: 3px solid #FFFFFF;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.card-front {
  background-color: var(--color-teal);
  background-image: radial-gradient(circle, rgba(255,255,255,0.15) 20%, transparent 20%);
  background-size: 15px 15px;
  color: #FFFFFF;
  font-size: 2.2rem;
  /* Fun question mark pattern */
}
.card-front::after {
  content: '?';
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 3rem;
  color: rgba(255, 255, 255, 0.6);
}

.card-back {
  background-color: #FFFFFF;
  transform: rotateY(180deg);
  padding: 8px;
}
.card-icon-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.memory-info-banner {
  background-color: var(--color-yellow-light);
  border: 3px dashed var(--color-yellow);
  padding: 14px 28px;
  border-radius: var(--radius-md);
  text-align: center;
  animation: pulse 1.5s infinite ease-in-out;
}
.word-ru {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--text-dark);
}
.word-en {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-orange);
  margin-top: 4px;
}

/* ==========================================================================
   SCREEN 3: BOOKS & READER
   ========================================================================== */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 40px;
}

.book-card {
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}
.book-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.book-cover-img {
  height: 240px;
  background-size: cover;
  background-position: center;
  position: relative;
}
.book-ribbon {
  position: absolute;
  top: 16px;
  right: 16px;
  background-color: var(--color-orange);
  color: #FFFFFF;
  padding: 6px 14px;
  border-radius: 50px;
  font-weight: 800;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: var(--shadow-sm);
}

.book-details {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}
.book-details h3 {
  font-size: 1.45rem;
}
.book-details p {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  flex-grow: 1;
}

.read-book-btn {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-md);
  font-weight: 800;
  font-size: 1.05rem;
  color: #FFFFFF;
  background-color: var(--color-purple);
  border-bottom: 3px solid #6E6EC9;
  text-align: center;
}
.book-card:hover .read-book-btn {
  background-color: #9C9CFF;
}

/* Interactive Book Reader Workspace */
.book-reader-container {
  display: none;
  flex-direction: column;
  align-items: center;
}
.book-reader-container.active {
  display: flex;
}

.book-container {
  width: 100%;
  max-width: 900px;
  height: 520px;
  background-color: #FDF9F5;
  border-radius: 20px;
  box-shadow: var(--shadow-lg), 0 25px 50px rgba(0, 0, 0, 0.15);
  border: 12px solid #5A4843; /* Wooden/leather book binding outer style */
  position: relative;
  margin-bottom: 20px;
}

.book-pages {
  display: grid;
  grid-template-columns: 1fr 1fr;
  height: 100%;
  position: relative;
  background-image: linear-gradient(to right, #FAF4EE 48%, #D8C8BD 50%, #FAF4EE 52%);
}

.book-page {
  padding: 32px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
}

.left-page {
  border-right: 1px solid rgba(58, 46, 43, 0.1);
}

.right-page {
  border-left: 1px solid rgba(255, 255, 255, 0.4);
}

/* Page illustrations */
.book-page-illustration {
  width: 90%;
  max-height: 80%;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 4px solid #FFFFFF;
  box-shadow: var(--shadow-md);
  margin: 0 auto;
}

/* Page texts */
.book-text-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
}
.book-text-title {
  font-size: 1.6rem;
  color: var(--color-orange);
  line-height: 1.2;
}
.book-text-paragraph {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text-dark);
}

/* Interactive navigation inside book overlay */
.book-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border-radius: var(--radius-round);
  background-color: #FFFFFF;
  border: 2px solid var(--text-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dark);
  box-shadow: var(--shadow-md);
  z-index: 10;
}
.book-nav-btn:hover {
  background-color: var(--color-peach-light);
  color: var(--color-orange);
  border-color: var(--color-orange);
  transform: translateY(-50%) scale(1.1);
}
.prev-btn { left: -25px; }
.next-btn { right: -25px; }

.book-pagination {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-muted);
}
#book-current-page {
  color: var(--color-orange);
  font-weight: 800;
}

/* ==========================================================================
   SCREEN 4: LUNA'S WORLD (CHARACTERS)
   ========================================================================== */
.characters-grid {
  display: flex;
  flex-direction: column;
  gap: 32px;
  margin-top: 20px;
}

.character-card {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  border: 2px solid transparent;
  transition: all var(--transition-normal);
}
.character-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.character-card.bg-cream:hover { border-color: var(--color-yellow); }
.character-card.bg-peach:hover { border-color: var(--color-orange); }
.character-card.bg-purple:hover { border-color: var(--color-purple); }
.character-card.bg-teal:hover { border-color: var(--color-teal); }

.char-image-container {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #FFFFFF;
  border-radius: var(--radius-md);
  border: 3px solid rgba(58, 46, 43, 0.05);
  overflow: hidden;
  height: 200px;
}
.char-avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.char-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
}
.char-name {
  font-size: 1.8rem;
  color: var(--text-dark);
}
.char-role {
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-orange);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.char-desc {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   WIN CONGRATULATIONS MODAL
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(58, 46, 43, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity 0.3s ease;
}
.modal-overlay.hidden {
  display: none !important;
  opacity: 0;
}

.modal-card {
  background-color: #FFFFFF;
  width: 90%;
  max-width: 440px;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  border: 6px solid var(--color-peach-light);
  box-shadow: var(--shadow-lg);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  animation: slideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.modal-stars {
  font-size: 2.2rem;
  color: var(--color-yellow);
  animation: winStarPop 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

.modal-card h2 {
  font-size: 2rem;
  color: var(--color-orange);
}
.modal-card p {
  font-size: 1.1rem;
  color: var(--text-muted);
  font-weight: 700;
}

.modal-character-image {
  width: 140px;
  height: 140px;
  border-radius: var(--radius-round);
  overflow: hidden;
  border: 4px solid var(--color-peach);
  box-shadow: var(--shadow-md);
}
.modal-luna {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.main-footer {
  background-color: #5A4843;
  color: rgba(255, 255, 255, 0.7);
  padding: 30px 24px;
  text-align: center;
  border-top: 4px solid var(--color-orange);
  margin-top: 80px;
}
.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}
.main-footer p {
  font-size: 0.95rem;
  font-weight: 600;
}
.main-footer ♥ {
  color: var(--color-red);
}

/* ==========================================================================
   RESPONSIVE DESIGN MEDIA QUERIES
   ========================================================================== */
@media (max-width: 992px) {
  #hero-main-title {
    font-size: 2.5rem;
  }
  .hero-section {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 30px;
  }
  .hero-text-content {
    align-items: center;
  }
  .hero-image-container {
    grid-row: 1; /* Move image above text on smaller screens */
  }
  
  .game-layout {
    grid-template-columns: 1fr;
  }
  
  .book-container {
    height: 480px;
  }
}

@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    gap: 16px;
  }
  
  .app-content {
    padding-top: 24px;
  }
  
  .character-card {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 24px;
  }
  .char-image-container {
    height: 180px;
    width: 180px;
    margin: 0 auto;
    border-radius: var(--radius-round);
  }
  .char-avatar {
    border-radius: var(--radius-round);
  }
  
  .book-container {
    height: auto;
    border-width: 6px;
  }
  .book-pages {
    grid-template-columns: 1fr;
    height: auto;
    background-image: none;
  }
  .book-page {
    height: auto;
    padding: 20px;
  }
  .book-page-illustration {
    max-height: 240px;
    margin-bottom: 12px;
  }
  .left-page {
    border-right: none;
  }
  
  .memory-board {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }
  .memory-card {
    width: 90px;
    height: 90px;
  }
}

@media (max-width: 480px) {
  #hero-main-title {
    font-size: 2rem;
  }
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }
  .hero-buttons button {
    width: 100%;
  }
  
  .preview-card {
    padding: 24px;
  }
  
  .memory-board {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }
  .memory-card {
    width: 80px;
    height: 80px;
  }
  .card-front::after {
    font-size: 2.2rem;
  }
  
  .book-nav-btn {
    width: 40px;
    height: 40px;
  }
  .prev-btn { left: -10px; }
  .next-btn { right: -10px; }
}

/* ==========================================================================
   OPTIMIZATION & DYNAMIC LAYOUT EXTENSIONS (AESTHETICS & RESPONSIVENESS)
   ========================================================================== */

/* Game Categories Layout */
.games-category-container {
  margin-bottom: 40px;
}
.category-heading {
  font-size: 1.8rem;
  color: var(--text-dark);
  margin-bottom: 20px;
  position: relative;
  display: inline-block;
  padding-left: 15px;
}
.category-heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15%;
  height: 70%;
  width: 6px;
  background-color: var(--color-orange);
  border-radius: 4px;
}

/* File Upload Button styling */
.file-upload-btn-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-teal);
  color: #FFFFFF;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-title);
  font-weight: 600;
  transition: all var(--transition-fast);
  cursor: pointer;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
}
.file-upload-btn-label:hover {
  background-color: #4db3b6;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.file-upload-btn-label:active {
  transform: translateY(0);
}
.file-upload-input {
  display: none !important;
}

/* Custom Jigsaw Shape Select buttons */
.shape-selector {
  display: flex;
  gap: 10px;
  width: 100%;
}
.shape-btn {
  flex: 1;
  background-color: #FFFFFF;
  border: 2.5px solid var(--color-peach-light);
  color: var(--text-dark);
  padding: 10px;
  border-radius: var(--radius-sm);
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}
.shape-btn.active {
  background-color: var(--color-orange);
  border-color: var(--color-orange);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}
.shape-btn:hover:not(.active) {
  border-color: var(--color-orange);
  background-color: var(--color-orange-light);
}

/* Rotation Checkbox Custom Styling */
.checkbox-container {
  display: flex;
  align-items: center;
  position: relative;
  padding-left: 35px;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  user-select: none;
  color: var(--text-dark);
}
.checkbox-container input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}
.checkmark {
  position: absolute;
  top: 0;
  left: 0;
  height: 24px;
  width: 24px;
  background-color: #FFFFFF;
  border: 2.5px solid var(--color-peach-light);
  border-radius: 6px;
  transition: all var(--transition-fast);
}
.checkbox-container:hover input ~ .checkmark {
  border-color: var(--color-orange);
  background-color: var(--color-orange-light);
}
.checkbox-container input:checked ~ .checkmark {
  background-color: var(--color-orange);
  border-color: var(--color-orange);
}
.checkmark:after {
  content: "";
  position: absolute;
  display: none;
}
.checkbox-container input:checked ~ .checkmark:after {
  display: block;
}
.checkbox-container .checkmark:after {
  left: 7px;
  top: 3px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
}
.checkbox-label {
  padding-top: 2px;
}

/* Stats Bar inside Workspace */
.game-stats-bar {
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: #FFFFFF;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: 15px;
  width: 100%;
  max-width: 500px;
}
.stat-item {
  font-family: var(--font-title);
  font-weight: 600;
  color: var(--text-muted);
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 6px;
}
.stat-val {
  color: var(--color-orange);
  font-weight: 700;
  font-size: 1.2rem;
}
.star-rating {
  font-size: 1.3rem;
  letter-spacing: 2px;
  color: var(--color-yellow);
}

/* Progress bar styling */
.progress-bar-wrapper {
  width: 100%;
  max-width: 500px;
  height: 10px;
  background-color: var(--color-orange-light);
  border-radius: 10px;
  margin-bottom: 20px;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
}
.progress-bar-fill {
  height: 100%;
  background-color: var(--color-orange);
  width: 0%;
  border-radius: 10px;
  transition: width var(--transition-normal);
}

/* Memory Game Header Styling Wrapper */
.memory-header-wrapper {
  width: 100%;
  max-width: 600px;
  margin-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  flex-direction: column;
}
.memory-header-wrapper .progress-bar-wrapper {
  margin-bottom: 0;
  max-width: 600px;
}

/* Interactive piece outline shadow */
canvas.puzzle-piece {
  cursor: grab;
  touch-action: none;
  filter: drop-shadow(0px 3px 6px rgba(58, 46, 43, 0.15));
  transition: filter 0.15s ease, transform 0.2s cubic-bezier(0.25, 1, 0.5, 1);
}
canvas.puzzle-piece:active {
  cursor: grabbing;
  filter: drop-shadow(0px 8px 16px rgba(58, 46, 43, 0.25));
}
canvas.puzzle-piece.placed {
  cursor: default;
  filter: none;
}