/* ============================================================
   ΦΩΝΟΠΑΙΧΝΙΔΙ — Complete Stylesheet
   Design System + Components + Games + Animations
   ============================================================ */

/* ===========================================
   1. DESIGN TOKENS (CSS Custom Properties)
   =========================================== */
:root {
    /* --- Colors: Calm & Child-Friendly --- */
    --bg-primary: #FFF8F0;
    --bg-secondary: #FFF0E5;
    --bg-card: #FFFFFF;
    --bg-overlay: rgba(61, 61, 61, 0.4);

    --primary: #B8A9E8;
    --primary-light: #D4C9F0;
    --primary-dark: #8B79C7;
    --secondary: #A8E6CF;
    --secondary-light: #C8F0DF;
    --secondary-dark: #6CC99E;
    --accent-warm: #FFB7B2;
    --accent-warm-light: #FFD4D1;
    --accent-cool: #87CEEB;
    --accent-cool-light: #B0DFEF;

    --success: #81C784;
    --success-light: #C8E6C9;
    --error: #F48FB1;
    --error-light: #F8BBD0;
    --warning: #FFE082;

    --text-primary: #3D3D3D;
    --text-secondary: #6B6B6B;
    --text-light: #FFFFFF;
    --text-muted: #9E9E9E;

    /* Level Colors */
    --level1: #FFE082;
    --level1-dark: #F9A825;
    --level2: #A8E6CF;
    --level2-dark: #43A047;
    --level3: #B8A9E8;
    --level3-dark: #7E57C2;
    --level4: #87CEEB;
    --level4-dark: #1976D2;
    --level5: #FFB7B2;
    --level5-dark: #E53935;

    /* --- Typography --- */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Nunito', sans-serif;

    --text-xs: 0.7rem;
    --text-sm: 0.8rem;
    --text-base: 0.95rem;
    --text-lg: 1.05rem;
    --text-xl: 1.15rem;
    --text-2xl: 1.35rem;
    --text-3xl: 1.7rem;
    --text-4xl: 2.1rem;
    --text-5xl: 2.8rem;

    /* --- Spacing (trimmed so a full game screen fits in one viewport) --- */
    --space-xs: 0.2rem;
    --space-sm: 0.35rem;
    --space-md: 0.6rem;
    --space-lg: 0.9rem;
    --space-xl: 1.15rem;
    --space-2xl: 1.6rem;
    --space-3xl: 2.2rem;

    /* --- Borders & Shadows --- */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 20px rgba(184, 169, 232, 0.3);
    --shadow-success: 0 0 20px rgba(129, 199, 132, 0.4);
    --shadow-error: 0 0 20px rgba(244, 143, 177, 0.4);

    /* --- Transitions --- */
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 500ms;
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
}

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

button {
    font-family: var(--font-body);
    font-weight: 700;
    cursor: pointer;
    border: none;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

input {
    font-family: var(--font-body);
    font-weight: 600;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: var(--radius-full);
}

/* ===========================================
   3. APP CONTAINER
   =========================================== */
#app {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-md);
    max-width: 900px;
    margin: 0 auto;
}

/* ===========================================
   4. FLOATING BACKGROUND SHAPES
   =========================================== */
#bg-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.bg-shape {
    position: absolute;
    opacity: 0.12;
    border-radius: 50%;
}

.shape-circle {
    border-radius: 50%;
}

.shape-square {
    border-radius: var(--radius-lg);
}

.shape-triangle {
    border-radius: 0;
    clip-path: polygon(50% 0%, 0% 100%, 100% 100%);
}

.shape-1 {
    width: 120px; height: 120px;
    background: var(--primary);
    top: 10%; left: 5%;
    animation: floatSlow 20s ease-in-out infinite;
}
.shape-2 {
    width: 80px; height: 80px;
    background: var(--secondary);
    top: 60%; right: 8%;
    animation: floatSlow 25s ease-in-out infinite reverse;
}
.shape-3 {
    width: 60px; height: 60px;
    background: var(--accent-warm);
    top: 30%; right: 15%;
    animation: floatSlow 18s ease-in-out infinite 2s;
}
.shape-4 {
    width: 90px; height: 90px;
    background: var(--accent-cool);
    bottom: 15%; left: 10%;
    animation: floatSlow 22s ease-in-out infinite 5s;
}
.shape-5 {
    width: 50px; height: 50px;
    background: var(--warning);
    top: 75%; left: 50%;
    animation: floatSlow 15s ease-in-out infinite 3s;
}
.shape-6 {
    width: 70px; height: 70px;
    background: var(--primary-light);
    top: 5%; right: 30%;
    animation: floatSlow 24s ease-in-out infinite 1s;
}
.shape-7 {
    width: 40px; height: 40px;
    background: var(--secondary-dark);
    bottom: 30%; right: 5%;
    animation: floatSlow 19s ease-in-out infinite 4s;
}
.shape-8 {
    width: 100px; height: 100px;
    background: var(--accent-warm-light);
    bottom: 5%; left: 40%;
    animation: floatSlow 21s ease-in-out infinite 6s;
}

/* ===========================================
   5. CONFETTI CANVAS
   =========================================== */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    pointer-events: none;
}

/* ===========================================
   6. BUTTONS
   =========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-xl);
    font-size: var(--text-lg);
    font-weight: 700;
    transition: all var(--duration-normal) var(--ease-bounce);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    border-radius: inherit;
    pointer-events: none;
}

.btn:hover {
    transform: translateY(-3px) scale(1.03);
}
.btn:active {
    transform: translateY(0) scale(0.97);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--text-light);
    box-shadow: var(--shadow-md), 0 4px 15px rgba(184, 169, 232, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
    color: var(--text-primary);
    box-shadow: var(--shadow-md), 0 4px 15px rgba(168, 230, 207, 0.4);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent-warm), #e8918b);
    color: var(--text-light);
    box-shadow: var(--shadow-md), 0 4px 15px rgba(255, 183, 178, 0.4);
}

.btn-large {
    padding: var(--space-lg) var(--space-3xl);
    font-size: var(--text-2xl);
    border-radius: var(--radius-xl);
}

.btn-small {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-sm);
    border-radius: var(--radius-md);
}

.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    border-radius: 50%;
    font-size: var(--text-xl);
    background: var(--bg-card);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.btn-icon:hover {
    box-shadow: var(--shadow-md);
}

.btn-back {
    position: absolute;
    top: var(--space-md);
    left: var(--space-md);
    z-index: 10;
}

.btn-disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* ===========================================
   7. CARDS
   =========================================== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--duration-normal) var(--ease-smooth);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-interactive {
    cursor: pointer;
}
.card-interactive:hover {
    transform: translateY(-4px);
}
.card-interactive:active {
    transform: translateY(0) scale(0.98);
}

/* Level Card */
.level-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg) var(--space-xl);
    border-left: 6px solid var(--level-color, var(--primary));
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-bounce);
    width: 100%;
    max-width: 600px;
}

.level-card:hover {
    transform: translateX(8px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.level-card:active {
    transform: translateX(4px) scale(0.99);
}

.level-card .level-emoji {
    font-size: var(--text-4xl);
    flex-shrink: 0;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.level-card .level-img {
    width: 56px;
    height: 56px;
    object-fit: contain;
    flex-shrink: 0;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
    border-radius: var(--radius-md);
}

.level-card .level-info {
    flex: 1;
    min-width: 0;
}

.level-card .level-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.level-card .level-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.level-card .level-stars {
    display: flex;
    gap: 2px;
    margin-top: var(--space-xs);
    font-size: var(--text-sm);
}

/* Game Card (sub-game selection) */
.game-card {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-bounce);
    width: 100%;
    max-width: 600px;
    border: 2px solid transparent;
}

.game-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--level-color, var(--primary-light));
}

.game-card:active {
    transform: translateY(0) scale(0.98);
}

.game-card .game-icon {
    font-size: var(--text-3xl);
    flex-shrink: 0;
}

.game-card .game-icon-img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
}

.game-card .game-info {
    flex: 1;
}

.game-card .game-title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 700;
}

.game-card .game-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.game-card .game-stars {
    display: flex;
    gap: 2px;
    font-size: var(--text-base);
}

/* ===========================================
   8. PROGRESS BAR
   =========================================== */
.progress-bar {
    width: 100%;
    height: 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.06);
}

.progress-bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width var(--duration-slow) var(--ease-bounce);
    position: relative;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(180deg, rgba(255,255,255,0.3), transparent);
    border-radius: var(--radius-full);
}

/* ===========================================
   9. HOME SCREEN
   =========================================== */
.home-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
    padding: var(--space-xl);
    gap: var(--space-xl);
}

.home-logo {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-dark), var(--accent-cool), var(--secondary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 4s ease-in-out infinite;
    background-size: 200% 200%;
    line-height: 1.1;
}

.home-logo-img {
    width: 136px;
    height: auto;
    animation: bounce 2.5s ease-in-out infinite;
    filter: drop-shadow(0 8px 20px rgba(0,0,0,0.12));
    cursor: pointer;
    transition: transform var(--duration-fast) var(--ease-bounce);
}

.home-logo-img:hover {
    animation-play-state: paused;
    transform: scale(1.08);
}

.home-subtitle {
    font-size: var(--text-xl);
    color: var(--text-secondary);
    max-width: 400px;
}

.home-settings {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    z-index: 10;
}

.site-back-link {
    position: fixed;
    top: var(--space-md);
    left: var(--space-md);
    z-index: 10;
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    background: var(--bg-card);
    color: var(--primary-dark);
    font-weight: 700;
    font-size: var(--text-sm);
    text-decoration: none;
    box-shadow: var(--shadow-sm);
    transition: transform var(--duration-fast) var(--ease-bounce);
}

.site-back-link:hover {
    transform: translateY(-2px);
}

/* Sound + settings icons on the level-select screen, grouped so they
   can't drift apart or shift when other buttons on the screen are
   pressed (fixed to the viewport, same as the home screen's gear icon). */
.level-select-topbar-icons {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    z-index: 10;
    display: flex;
    gap: var(--space-sm);
}

.sound-toggle-level {
    font-size: var(--text-xl);
}

/* ===========================================
   10. LEVEL SELECT SCREEN
   =========================================== */
.level-select-screen {
    width: 100%;
    padding: var(--space-xl) var(--space-md);
    padding-top: var(--space-3xl);
}

.level-select-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.level-select-header h1 {
    font-size: var(--text-3xl);
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.level-select-header p {
    color: var(--text-secondary);
    font-size: var(--text-lg);
}

.level-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
    position: relative;
}

/* Path connector between levels */
.level-list::before {
    content: '';
    position: absolute;
    top: 40px;
    bottom: 40px;
    left: 50%;
    width: 4px;
    background: linear-gradient(
        180deg,
        var(--level1),
        var(--level2),
        var(--level3),
        var(--level4),
        var(--level5)
    );
    border-radius: var(--radius-full);
    transform: translateX(-50%);
    z-index: -1;
    opacity: 0.3;
}

/* ===========================================
   11. GAME SELECT SCREEN (Sub-games in a level)
   =========================================== */
.game-select-screen {
    width: 100%;
    padding: var(--space-xl) var(--space-md);
    padding-top: var(--space-3xl);
}

.game-select-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.game-select-header .level-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.game-select-header h1 {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-sm);
}

.game-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
}

/* ===========================================
   12. GAME PLAY SCREEN
   =========================================== */
.game-screen {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
}

.game-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    margin-bottom: var(--space-md);
    position: relative;
}

.game-header .game-header-title {
    flex: 1;
    text-align: center;
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 800;
}

.game-header .game-header-progress {
    flex: 1;
    max-width: 200px;
}

.game-header .round-counter {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    text-align: center;
    margin-top: 4px;
}

.game-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-xl);
    padding: var(--space-md);
    padding-top: var(--space-3xl);
}

.game-instruction {
    text-align: center;
    font-size: var(--text-xl);
    color: var(--text-secondary);
    max-width: 500px;
    animation: fadeSlideIn var(--duration-slow) var(--ease-smooth);
}

.game-main-word {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 800;
    text-align: center;
    color: var(--text-primary);
    animation: popIn var(--duration-slow) var(--ease-bounce);
}

.game-main-emoji {
    font-size: 60px;
    text-align: center;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.15));
    animation: popIn var(--duration-slow) var(--ease-bounce);
}

.game-footer {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    padding: var(--space-lg) 0;
}

/* ===========================================
   13. GAME: CLAPPING (Word Counting)
   =========================================== */
.clap-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    width: 100%;
}

.clap-sentence {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    text-align: center;
    padding: var(--space-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    line-height: 1.6;
    max-width: 500px;
    width: 100%;
}

.clap-sentence .word {
    display: inline-block;
    padding: 2px 6px;
    margin: 2px;
    border-radius: var(--radius-sm);
    transition: all var(--duration-normal) var(--ease-bounce);
}

.clap-sentence .word.highlighted {
    background: var(--primary-light);
    transform: scale(1.1);
}

.clap-button {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: linear-gradient(145deg, var(--accent-warm-light), var(--accent-warm));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    box-shadow: var(--shadow-lg), 0 8px 25px rgba(255, 183, 178, 0.4);
    transition: all var(--duration-fast) var(--ease-bounce);
    cursor: pointer;
    border: none;
    position: relative;
}

.clap-button:hover {
    transform: scale(1.08);
}

.clap-button:active {
    transform: scale(0.92);
    box-shadow: var(--shadow-sm);
}

.clap-button.clapped {
    animation: clapPulse 0.3s var(--ease-bounce);
}

.clap-counter {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    justify-content: center;
    min-height: 50px;
}

.clap-button-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.clap-reset-btn {
    width: 40px;
    height: 40px;
    font-size: var(--text-lg);
    flex-shrink: 0;
}

.clap-dot {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    color: white;
    font-weight: 800;
    animation: popIn var(--duration-normal) var(--ease-bounce);
    box-shadow: var(--shadow-sm);
}

.clap-check-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

.clap-number-choices {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

.number-choice-btn {
    width: 70px;
    height: 70px;
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    border: 3px solid var(--primary-light);
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 800;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-bounce);
    box-shadow: var(--shadow-sm);
}

.number-choice-btn:hover {
    border-color: var(--primary);
    transform: translateY(-4px) scale(1.05);
    box-shadow: var(--shadow-md);
}

.number-choice-btn:active {
    transform: scale(0.95);
}

.number-choice-btn.correct {
    background: var(--success-light);
    border-color: var(--success);
    animation: correctPulse 0.5s var(--ease-bounce);
}

.number-choice-btn.wrong {
    background: var(--error-light);
    border-color: var(--error);
    animation: shake 0.5s var(--ease-smooth);
}

/* Level 4 letter picker */
.letter-picker-grid {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
    max-width: 640px;
    margin: var(--space-lg) auto 0;
}

.letter-chip {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    background: var(--bg-card);
    border: 3px solid var(--primary-light);
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 800;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-bounce);
    box-shadow: var(--shadow-sm);
}

.letter-chip:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.letter-chip.selected {
    background: var(--primary);
    border-color: var(--primary-dark);
    color: var(--text-light);
}

/* ===========================================
   14. GAME: DRAG & DROP
   =========================================== */
.drag-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    width: 100%;
}

.drop-zone-container {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    justify-content: center;
    padding: var(--space-md);
    min-height: 80px;
}

.drop-zone {
    min-width: 80px;
    min-height: 60px;
    padding: var(--space-md);
    border: 3px dashed var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-normal) var(--ease-smooth);
    background: rgba(255,255,255,0.6);
    font-size: var(--text-lg);
    font-weight: 700;
}

.drop-zone.drag-over {
    border-color: var(--primary);
    background: var(--primary-light);
    transform: scale(1.05);
    box-shadow: var(--shadow-glow);
}

.drop-zone.filled {
    border-style: solid;
    border-color: var(--primary);
    background: var(--bg-card);
}

.drop-zone.correct {
    border-color: var(--success);
    background: var(--success-light);
}

.drop-zone.wrong {
    border-color: var(--error);
    background: var(--error-light);
    animation: shake 0.5s var(--ease-smooth);
}

.draggable-items {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
    padding: var(--space-md);
}

.draggable-item {
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-card);
    border: 2px solid var(--primary-light);
    border-radius: var(--radius-md);
    font-size: var(--text-lg);
    font-weight: 700;
    cursor: grab;
    transition: all var(--duration-normal) var(--ease-bounce);
    box-shadow: var(--shadow-sm);
    touch-action: none;
}

.draggable-item:hover {
    transform: translateY(-3px) scale(1.05);
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.draggable-item:active,
.draggable-item.dragging {
    cursor: grabbing;
    transform: scale(1.1) rotate(2deg);
    box-shadow: var(--shadow-lg);
    z-index: 50;
    opacity: 0.9;
}

.draggable-item.placed {
    opacity: 0.3;
    pointer-events: none;
    transform: scale(0.9);
}

/* ===========================================
   15. GAME: MULTIPLE CHOICE
   =========================================== */
.choices-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    max-width: 620px;
    width: 100%;
}

.choice-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xl);
    background: var(--bg-card);
    border: 3px solid transparent;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-bounce);
}

.choice-card:hover {
    border-color: var(--primary-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.choice-card:active {
    transform: scale(0.96);
}

.choice-card .choice-emoji {
    font-size: 72px;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.choice-card .choice-word {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 700;
}

.choice-card.correct {
    border-color: var(--success);
    background: var(--success-light);
    animation: correctPulse 0.5s var(--ease-bounce);
}

.choice-card.wrong {
    border-color: var(--error);
    background: var(--error-light);
    animation: shake 0.5s var(--ease-smooth);
}

.choice-card.disabled {
    pointer-events: none;
    opacity: 0.6;
}

/* ===========================================
   16. GAME: MEMORY CARDS
   =========================================== */
.memory-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    max-width: 500px;
    width: 100%;
}

.memory-card-wrapper {
    aspect-ratio: 1;
    perspective: 600px;
    cursor: pointer;
}

.memory-card {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s var(--ease-smooth);
    border-radius: var(--radius-md);
}

.memory-card.flipped {
    transform: rotateY(180deg);
}

.memory-card.matched {
    animation: matchPulse 0.6s var(--ease-bounce);
}

.memory-card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.memory-card-front {
    background: linear-gradient(145deg, var(--primary), var(--primary-dark));
    color: white;
    font-size: var(--text-3xl);
}

.memory-card-front::after {
    content: '?';
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 800;
}

.memory-card-back {
    background: var(--bg-card);
    border: 3px solid var(--primary-light);
    transform: rotateY(180deg);
    font-size: 36px;
    gap: var(--space-xs);
    padding: var(--space-sm);
}

.memory-card-back .memory-word {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--text-primary);
}

.memory-card.matched .memory-card-back {
    border-color: var(--success);
    background: var(--success-light);
}

/* ===========================================
   17. GAME: SYLLABLE BOXES
   =========================================== */
.syllable-boxes {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    transition: opacity var(--duration-slow) var(--ease-smooth);
}

.syllable-box {
    min-width: 80px;
    min-height: 70px;
    padding: var(--space-md);
    background: var(--bg-card);
    border: 3px solid var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 800;
    transition: all var(--duration-normal) var(--ease-bounce);
    box-shadow: var(--shadow-sm);
}

.syllable-box.active {
    border-color: var(--primary);
    background: var(--primary-light);
    animation: pulse 1s ease-in-out infinite;
}

.syllable-box.removing {
    animation: syllableRemove 0.8s var(--ease-smooth) forwards;
}

.syllable-box.remaining {
    border-color: var(--success);
    background: var(--success-light);
}

/* ===========================================
   18. GAME: ELKONIN BOXES
   =========================================== */
.elkonin-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    width: 100%;
}

.elkonin-boxes {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.elkonin-box {
    width: 64px;
    height: 64px;
    border: 3px dashed var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-normal) var(--ease-smooth);
    background: rgba(255,255,255,0.6);
}

.elkonin-box.filled {
    border-style: solid;
    border-color: var(--primary);
}

.elkonin-box.drag-over {
    border-color: var(--primary-dark);
    background: var(--primary-light);
    transform: scale(1.08);
}

.elkonin-box .phoneme-token {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 800;
    color: white;
    animation: popIn var(--duration-normal) var(--ease-bounce);
}

.phoneme-token.vowel {
    background: linear-gradient(145deg, var(--accent-warm), #e88a83);
}

.phoneme-token.consonant {
    background: linear-gradient(145deg, var(--accent-cool), #5ba8c8);
}

.phoneme-tokens-source {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

.phoneme-draggable {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 800;
    color: white;
    cursor: grab;
    transition: all var(--duration-normal) var(--ease-bounce);
    box-shadow: var(--shadow-md);
    touch-action: none;
}

.phoneme-draggable.vowel {
    background: linear-gradient(145deg, var(--accent-warm), #e88a83);
}

.phoneme-draggable.consonant {
    background: linear-gradient(145deg, var(--accent-cool), #5ba8c8);
}

.phoneme-draggable:hover {
    transform: scale(1.15);
}

.phoneme-draggable.placed {
    opacity: 0.3;
    pointer-events: none;
}

/* ===========================================
   19. GAME: SORTING / CATEGORIZATION
   =========================================== */
.sorting-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    width: 100%;
}

.sort-categories {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
}

.sort-category {
    flex: 1;
    min-width: 140px;
    max-width: 220px;
    border: 3px dashed var(--primary-light);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    text-align: center;
    transition: all var(--duration-normal) var(--ease-smooth);
    min-height: 150px;
}

.sort-category.drag-over {
    border-color: var(--primary);
    background: var(--primary-light);
    transform: scale(1.03);
}

.sort-category-label {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 800;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    display: inline-block;
}

.sort-category-items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
    min-height: 50px;
}

.sort-item {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    box-shadow: var(--shadow-sm);
    animation: popIn var(--duration-normal) var(--ease-bounce);
}

.sort-items-source {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

.sort-draggable {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md);
    background: var(--bg-card);
    border: 2px solid var(--primary-light);
    border-radius: var(--radius-md);
    cursor: grab;
    transition: all var(--duration-normal) var(--ease-bounce);
    box-shadow: var(--shadow-sm);
    touch-action: none;
}

.sort-draggable:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-md);
}

.sort-draggable .sort-emoji {
    font-size: var(--text-2xl);
}

.sort-draggable .sort-word {
    font-size: var(--text-sm);
    font-weight: 700;
}

/* ===========================================
   20. GAME: TEXT INPUT
   =========================================== */
.text-input-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    width: 100%;
    max-width: 400px;
}

.game-text-input {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    border: 3px solid var(--primary-light);
    border-radius: var(--radius-lg);
    font-size: var(--text-xl);
    font-weight: 700;
    text-align: center;
    background: var(--bg-card);
    color: var(--text-primary);
    transition: all var(--duration-normal) var(--ease-smooth);
    box-shadow: var(--shadow-sm);
}

.game-text-input:focus {
    border-color: var(--primary);
    box-shadow: var(--shadow-glow);
    outline: none;
}

.game-text-input.correct {
    border-color: var(--success);
    box-shadow: var(--shadow-success);
}

.game-text-input.wrong {
    border-color: var(--error);
    box-shadow: var(--shadow-error);
    animation: shake 0.5s var(--ease-smooth);
}

/* ===========================================
   21. GAME COMPLETE SCREEN
   =========================================== */
.game-complete-screen {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
    gap: var(--space-xl);
    padding: var(--space-xl);
}

.complete-emoji {
    font-size: 60px;
    animation: bounce 1s var(--ease-bounce) infinite;
}

.complete-title {
    font-family: var(--font-heading);
    font-size: var(--text-3xl);
    font-weight: 800;
    color: var(--text-primary);
}

.complete-message {
    font-size: var(--text-xl);
    color: var(--text-secondary);
    max-width: 400px;
}

.complete-stars {
    display: flex;
    gap: var(--space-md);
    font-size: 50px;
}

.complete-star {
    transition: all 0.5s var(--ease-bounce);
    opacity: 0;
    transform: scale(0) rotate(-180deg);
}

.complete-star.earned {
    opacity: 1;
    transform: scale(1) rotate(0deg);
}

.complete-star:nth-child(1).earned { transition-delay: 0.2s; }
.complete-star:nth-child(2).earned { transition-delay: 0.5s; }
.complete-star:nth-child(3).earned { transition-delay: 0.8s; }

.complete-buttons {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: center;
}

/* ===========================================
   22. SETTINGS PANEL (Therapist)
   =========================================== */
.settings-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn var(--duration-normal) var(--ease-smooth);
}

.settings-panel {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    animation: slideUp var(--duration-slow) var(--ease-bounce);
    max-height: 80vh;
    overflow-y: auto;
}

.settings-panel h2 {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-xl);
    text-align: center;
}

.setting-group {
    margin-bottom: var(--space-lg);
}

.setting-group label {
    display: block;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.setting-group select,
.setting-group input[type="range"] {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--primary-light);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: var(--text-base);
    background: var(--bg-primary);
}

.setting-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) 0;
}

.toggle-switch {
    width: 52px;
    height: 28px;
    background: var(--text-muted);
    border-radius: var(--radius-full);
    position: relative;
    cursor: pointer;
    transition: background var(--duration-normal) var(--ease-smooth);
}

.toggle-switch.active {
    background: var(--success);
}

.toggle-switch::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    background: white;
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: transform var(--duration-normal) var(--ease-bounce);
    box-shadow: var(--shadow-sm);
}

.toggle-switch.active::after {
    transform: translateX(24px);
}

/* ===========================================
   23. FEEDBACK ELEMENTS
   =========================================== */
.feedback-overlay {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 150;
    pointer-events: none;
}

.feedback-message {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 800;
    text-align: center;
    animation: feedbackPop 1.2s var(--ease-bounce) forwards;
    text-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.feedback-message.correct {
    color: var(--success);
}

.feedback-message.wrong {
    color: var(--error);
}

/* Hint button */
.hint-btn {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    z-index: 10;
}

/* Sound toggle */
.sound-toggle {
    position: fixed;
    bottom: var(--space-lg);
    left: var(--space-lg);
    z-index: 10;
}

/* Teacher-note toggle — mirrors sound-toggle on the opposite corner */
.teacher-info-toggle {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    z-index: 10;
}

.teacher-note-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 300;
    padding: var(--space-lg);
}

.teacher-note-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    max-width: 480px;
    max-height: 85vh;
    overflow-y: auto;
    width: 100%;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.teacher-note-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 800;
    color: var(--primary);
    margin-bottom: var(--space-md);
}

.teacher-note-text {
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    text-align: left;
}

/* Voice (read-aloud) toggle — per-stage, separate from the sound toggle.
   Placed inline, to the right of whatever box it belongs to. */
.sentence-row {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-md);
    width: 100%;
}

.voice-toggle-inline {
    width: 40px;
    height: 40px;
    font-size: var(--text-lg);
    flex-shrink: 0;
}

.repeat-btn-text {
    flex-shrink: 0;
    white-space: nowrap;
}

@media (max-width: 600px) {
    .sentence-row { gap: var(--space-sm); }
    .voice-toggle-inline { width: 34px; height: 34px; font-size: var(--text-base); }
    .repeat-btn-text { padding: var(--space-xs) var(--space-sm); font-size: var(--text-xs); }
}

/* ===========================================
   24. PHONEME DISPLAY (for synthesis games)
   =========================================== */
.phoneme-display {
    display: flex;
    gap: var(--space-md);
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

.phoneme-bubble {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 800;
    color: white;
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: scale(0);
    transition: all var(--duration-normal) var(--ease-bounce);
}

.phoneme-bubble.visible {
    opacity: 1;
    transform: scale(1);
}

.phoneme-bubble.vowel {
    background: linear-gradient(145deg, var(--accent-warm), #e88a83);
}

.phoneme-bubble.consonant {
    background: linear-gradient(145deg, var(--accent-cool), #5ba8c8);
}

.phoneme-separator {
    font-size: var(--text-xl);
    color: var(--text-muted);
    opacity: 0;
    transition: opacity var(--duration-normal);
}

.phoneme-separator.visible {
    opacity: 1;
}

/* ===========================================
   25. TAP COUNTER (for syllable/phoneme counting)
   =========================================== */
.tap-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    width: 100%;
}

/* Shared by the newer Level 1 games (wordSizeCompare, wordPosition) —
   tighter spacing + a footer slot for a manual "next" control, so extra
   content revealed after answering still fits in one screen instead of
   pushing the page taller. */
.compact-tap-area {
    gap: var(--space-md);
}

.round-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.round-footer .wordsize-clap-btn {
    width: 64px;
    height: 64px;
    font-size: var(--text-xl);
}

.wordsize-syllable-boxes .syllable-box-mini {
    min-width: 34px;
    min-height: 34px;
    padding: var(--space-xs);
    font-size: var(--text-sm);
    border-width: 2px;
}

.tap-button {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(145deg, var(--secondary-light), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 50px;
    box-shadow: var(--shadow-lg), 0 8px 25px rgba(168, 230, 207, 0.4);
    cursor: pointer;
    border: none;
    transition: all var(--duration-fast) var(--ease-bounce);
}

.tap-button:hover {
    transform: scale(1.08);
}

.tap-button:active {
    transform: scale(0.9);
}

.tap-button.tapped {
    animation: tapPulse 0.3s var(--ease-bounce);
}

.tap-counter-dots {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.tap-dot {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--secondary);
    animation: popIn var(--duration-normal) var(--ease-bounce);
    box-shadow: var(--shadow-sm);
}

.tap-controls {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===========================================
   26. SOUND CHANGE GAME
   =========================================== */
.sound-change-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
    width: 100%;
}

.letter-display {
    display: flex;
    gap: var(--space-xs);
    justify-content: center;
    transition: opacity var(--duration-slow) var(--ease-smooth);
}

.letter-box {
    width: 56px;
    height: 64px;
    background: var(--bg-card);
    border: 3px solid var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 800;
    box-shadow: var(--shadow-sm);
    transition: all var(--duration-normal) var(--ease-bounce);
}

.letter-box.highlight {
    border-color: var(--accent-warm);
    background: var(--accent-warm-light);
    transform: scale(1.1);
    box-shadow: 0 0 15px rgba(255, 183, 178, 0.5);
}

.letter-box.changed {
    border-color: var(--success);
    background: var(--success-light);
    animation: popIn var(--duration-normal) var(--ease-bounce);
}


/* ===========================================
   27. ANIMATIONS (@keyframes)
   =========================================== */

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

@keyframes floatSlow {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(20px, -30px) rotate(5deg); }
    50% { transform: translate(-10px, -50px) rotate(-3deg); }
    75% { transform: translate(30px, -20px) rotate(7deg); }
}

@keyframes popIn {
    0% { transform: scale(0); opacity: 0; }
    60% { transform: scale(1.2); }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes fadeSlideIn {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

@keyframes slideUp {
    0% { transform: translateY(40px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-8px); }
    40% { transform: translateX(8px); }
    60% { transform: translateX(-5px); }
    80% { transform: translateX(5px); }
}

/* Draws the child's eye back to the instruction the moment the sentence
   is hidden and they have to answer from memory. */
.shake-attention {
    animation: shake 0.5s var(--ease-smooth);
}

@keyframes correctPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.08); }
    100% { transform: scale(1); }
}

@keyframes clapPulse {
    0% { transform: scale(1); }
    50% { transform: scale(0.85); }
    100% { transform: scale(1); }
}

@keyframes tapPulse {
    0% { transform: scale(1); }
    50% { transform: scale(0.88); }
    100% { transform: scale(1); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); box-shadow: var(--shadow-sm); }
    50% { transform: scale(1.03); box-shadow: var(--shadow-glow); }
}

@keyframes matchPulse {
    0% { transform: rotateY(180deg) scale(1); }
    50% { transform: rotateY(180deg) scale(1.15); }
    100% { transform: rotateY(180deg) scale(1); }
}

@keyframes syllableRemove {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2) translateY(-10px); opacity: 0.5; }
    100% { transform: scale(0) translateY(-30px); opacity: 0; }
}

@keyframes feedbackPop {
    0% { transform: translate(-50%, -50%) scale(0); opacity: 0; }
    40% { transform: translate(-50%, -50%) scale(1.3); opacity: 1; }
    70% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1.2); opacity: 0; }
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes starSpin {
    0% { transform: scale(0) rotate(-180deg); opacity: 0; }
    100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

@keyframes confettiFall {
    0% { transform: translateY(-10px) rotate(0deg); opacity: 1; }
    100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

/* ===========================================
   28. UTILITY CLASSES
   =========================================== */
.text-center { text-align: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.w-full { width: 100%; }
.hidden { display: none !important; }
.fade-in { animation: fadeSlideIn var(--duration-slow) var(--ease-smooth); }
.pop-in { animation: popIn var(--duration-normal) var(--ease-bounce); }

/* ===========================================
   29. RESPONSIVE DESIGN
   =========================================== */
@media (max-width: 600px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
        --text-3xl: 1.5rem;
    }

    #app {
        padding: var(--space-sm);
    }

    .memory-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-sm);
    }

    .choices-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-sm);
    }

    .choice-card {
        padding: var(--space-lg);
    }

    .choice-card .choice-emoji {
        font-size: 54px;
    }

    .choice-card .choice-word {
        font-size: var(--text-lg);
    }

    .clap-button {
        width: 110px;
        height: 110px;
        font-size: 45px;
    }

    .tap-button {
        width: 100px;
        height: 100px;
        font-size: 40px;
    }

    .home-mascot {
        font-size: 70px;
    }

    .game-main-emoji {
        font-size: 60px;
    }

    .sort-category {
        min-width: 120px;
    }

    .letter-box {
        width: 44px;
        height: 52px;
        font-size: var(--text-xl);
    }

    .level-card {
        padding: var(--space-md);
    }
}

@media (min-width: 768px) {
    .memory-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .home-screen {
        gap: var(--space-2xl);
    }
}

@media (min-width: 1024px) {
    :root {
        --text-5xl: 4rem;
    }
}

/* ===========================================
   30. PRINT STYLES (hide non-essentials)
   =========================================== */
@media print {
    #bg-shapes,
    #confetti-canvas,
    .btn-back,
    .hint-btn,
    .sound-toggle {
        display: none;
    }
}