/**
 * Foundation Number Game 2.0 - Temperature-Based Synesthetic Design
 * Muted color palette: cool blues (1-4), moderate greens/yellows (5-8), warm oranges/reds (9-12)
 * Fridge magnet aesthetic with rounded corners and subtle shadows
 */

/* ==================== CSS VARIABLES ==================== */
:root {
    /* ---- Temperature Color Scale (Muted Synesthetic) ---- */
    /* Cool (1-4) */
    --fng-num-1: #6B9BD1;   /* Soft sky blue */
    --fng-num-2: #5FA8A8;   /* Muted teal */
    --fng-num-3: #7DB88D;   /* Cool sage green */
    --fng-num-4: #6BAFC4;   /* Steel cyan */

    /* Moderate (5-8) */
    --fng-num-5: #A8B85F;   /* Olive green */
    --fng-num-6: #C4C25A;   /* Muted chartreuse */
    --fng-num-7: #D4C56A;   /* Warm gold */
    --fng-num-8: #D4A574;   /* Dusty amber */

    /* Warm (9-12) */
    --fng-num-9:  #D4845F;  /* Burnt sienna */
    --fng-num-10: #D47B7B;  /* Muted salmon */
    --fng-num-11: #C76B6B;  /* Dusty rose */
    --fng-num-12: #BF5B5B;  /* Warm brick red */

    /* Primary UI Colors (derived from temperature palette) */
    --fng-primary: #5FA8A8;
    --fng-primary-dark: #4A8C8C;
    --fng-primary-light: #7DC4C4;
    --fng-primary-lighter: #E0F2F2;

    /* Neutral Grays */
    --fng-gray-50:  #FAFAF9;
    --fng-gray-100: #F5F5F4;
    --fng-gray-200: #E7E5E4;
    --fng-gray-300: #D6D3D1;
    --fng-gray-400: #A8A29E;
    --fng-gray-500: #78716C;
    --fng-gray-600: #57534E;
    --fng-gray-700: #44403C;
    --fng-gray-800: #292524;
    --fng-gray-900: #1C1917;

    /* Semantic Colors */
    --fng-success: #7DB88D;
    --fng-success-light: #E5F2E9;
    --fng-error: #C76B6B;
    --fng-error-light: #F5E5E5;
    --fng-warning: #D4C56A;
    --fng-info: #6B9BD1;

    /* Shadows (warm-tinted for fridge magnet feel) */
    --fng-shadow-sm:  0 1px 2px rgba(68, 64, 60, 0.06);
    --fng-shadow:     0 2px 4px rgba(68, 64, 60, 0.08), 0 1px 2px rgba(68, 64, 60, 0.04);
    --fng-shadow-md:  0 4px 8px rgba(68, 64, 60, 0.10), 0 2px 4px rgba(68, 64, 60, 0.06);
    --fng-shadow-lg:  0 10px 20px rgba(68, 64, 60, 0.12), 0 4px 8px rgba(68, 64, 60, 0.06);
    --fng-shadow-xl:  0 20px 30px rgba(68, 64, 60, 0.14), 0 8px 12px rgba(68, 64, 60, 0.06);
    --fng-magnet-shadow: 0 3px 6px rgba(68, 64, 60, 0.15), 0 1px 3px rgba(68, 64, 60, 0.10), inset 0 1px 0 rgba(255,255,255,0.25);

    /* Typography */
    --fng-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --fng-font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, monospace;

    /* Transitions */
    --fng-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --fng-transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== GLOBAL STYLES ==================== */
* {
    box-sizing: border-box;
}

.fng-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    font-family: var(--fng-font-family);
    background: linear-gradient(135deg, var(--fng-gray-50) 0%, #F0EFED 100%);
    border-radius: 16px;
    min-height: 600px;
}

.fng-screen {
    background: white;
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: var(--fng-shadow-lg);
    animation: fngFadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--fng-gray-200);
}

.fng-hidden {
    display: none !important;
}

@keyframes fngFadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ==================== TYPOGRAPHY ==================== */
.fng-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 0.5rem 0;
    color: var(--fng-gray-900);
    letter-spacing: -0.025em;
}

.fng-title-icon {
    display: block;
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.fng-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--fng-gray-600);
    margin-bottom: 2rem;
    font-weight: 400;
}

.fng-screen-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 1rem 0;
    color: var(--fng-primary-dark);
    letter-spacing: -0.025em;
}

.fng-instruction {
    text-align: center;
    font-size: 1rem;
    color: var(--fng-gray-600);
    margin-bottom: 1.5rem;
    font-weight: 500;
    line-height: 1.5;
}

/* ==================== MODE SELECTION ==================== */
.fng-mode-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
    margin-top: 2rem;
}

.fng-mode-btn {
    background: white;
    border: 2px solid var(--fng-gray-200);
    border-radius: 14px;
    padding: 2rem 1.5rem;
    cursor: pointer;
    transition: var(--fng-transition);
    box-shadow: var(--fng-shadow-sm);
    text-align: center;
    color: var(--fng-gray-900);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    position: relative;
    overflow: hidden;
}

.fng-mode-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--fng-num-1), var(--fng-num-5), var(--fng-num-9), var(--fng-num-12));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.fng-mode-btn:hover {
    transform: translateY(-4px);
    box-shadow: var(--fng-shadow-lg);
    border-color: var(--fng-primary);
}

.fng-mode-btn:hover::before {
    transform: scaleX(1);
}

.fng-mode-btn:active {
    transform: translateY(-2px);
}

.fng-mode-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    transition: transform 0.3s ease;
}

.fng-mode-btn:hover .fng-mode-icon {
    transform: scale(1.1);
}

.fng-mode-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--fng-gray-900);
}

.fng-mode-desc {
    font-size: 0.875rem;
    color: var(--fng-gray-600);
    line-height: 1.5;
}

/* ==================== TABLE SELECTOR ==================== */
.fng-table-selection {
    text-align: center;
    padding: 2rem 1.5rem;
}

.fng-table-selection p {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--fng-gray-900);
    margin-bottom: 1.5rem;
}

.fng-table-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 0.75rem;
    max-width: 600px;
    margin: 0 auto 1.5rem;
}

.fng-table-btn {
    min-width: 65px;
    min-height: 65px;
    border: 2px solid var(--fng-gray-200);
    border-radius: 12px;
    font-size: 1.25rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--fng-transition-fast);
    box-shadow: var(--fng-magnet-shadow);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-shadow: 0 1px 2px rgba(0,0,0,0.15);
}

.fng-table-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--fng-shadow-lg);
}

.fng-table-btn:active {
    transform: translateY(0) scale(1);
}

.fng-table-btn.fng-selected {
    outline: 3px solid var(--fng-gray-900);
    outline-offset: 2px;
    transform: scale(1.08);
}

.fng-mix-btn {
    background: linear-gradient(135deg, var(--fng-num-1), var(--fng-num-6), var(--fng-num-12)) !important;
    grid-column: span 2;
    font-size: 1.1rem;
}

/* ==================== GAME STATS BAR ==================== */
.fng-game-stats {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.25rem;
    background: var(--fng-gray-50);
    border-radius: 12px;
    border: 1px solid var(--fng-gray-200);
}

.fng-stat {
    font-size: 1rem;
    font-weight: 600;
    color: var(--fng-gray-700);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.fng-stat span {
    color: var(--fng-primary-dark);
    font-weight: 700;
}

/* ==================== FRIDGE-MAGNET TILES ==================== */
.fng-magnet-tile {
    min-width: 72px;
    min-height: 72px;
    border: none;
    border-radius: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    text-shadow: 0 1px 2px rgba(0,0,0,0.15);
    cursor: pointer;
    transition: var(--fng-transition-fast);
    box-shadow: var(--fng-magnet-shadow);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--fng-primary);
}

.fng-magnet-tile:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--fng-shadow-lg);
    filter: brightness(1.08);
}

.fng-magnet-tile:active:not(:disabled) {
    transform: translateY(0) scale(0.98);
    box-shadow: var(--fng-shadow-sm);
}

.fng-magnet-tile:disabled {
    cursor: not-allowed;
    opacity: 0.4;
}

.fng-magnet-tile.fng-correct {
    opacity: 0.35;
    transform: scale(0.92);
    cursor: default;
}

.fng-magnet-tile.fng-error-flash {
    animation: fngShake 0.4s ease-in-out;
    box-shadow: 0 0 0 3px var(--fng-error), var(--fng-magnet-shadow);
}

/* Small number badge on magnet tiles */
.fng-magnet-tile .fng-badge {
    position: absolute;
    top: 3px;
    right: 5px;
    font-size: 0.55em;
    font-weight: 700;
    background: rgba(255,255,255,0.85);
    color: var(--fng-gray-800);
    padding: 1px 4px;
    border-radius: 4px;
    box-shadow: var(--fng-shadow-sm);
    animation: fngBadgePop 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    line-height: 1.3;
}

@keyframes fngBadgePop {
    from { transform: scale(0); opacity: 0; }
    to   { transform: scale(1); opacity: 1; }
}

/* ==================== GRID LAYOUTS ==================== */
.fng-tile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
    gap: 0.875rem;
    padding: 1.5rem;
    background: var(--fng-gray-50);
    border-radius: 14px;
    border: 1px solid var(--fng-gray-200);
    margin: 1.5rem 0;
}

/* ==================== FLASHCARD / QUESTION CARD ==================== */
.fng-card {
    border-radius: 16px;
    padding: 3rem 2rem;
    text-align: center;
    margin: 1.5rem auto;
    max-width: 440px;
    box-shadow: var(--fng-shadow-xl);
    color: white;
    position: relative;
    overflow: hidden;
}

.fng-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.12) 0%, transparent 50%);
    pointer-events: none;
}

.fng-question-text {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    font-weight: 500;
    opacity: 0.95;
}

.fng-question-value {
    font-size: 3.5rem;
    font-weight: 700;
    animation: fngScaleIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    font-family: var(--fng-font-mono);
}

@keyframes fngScaleIn {
    from { transform: scale(0.7); opacity: 0; }
    to   { transform: scale(1);   opacity: 1; }
}

/* ==================== ANSWER INPUT (Flashcard) ==================== */
.fng-answer-area {
    text-align: center;
    margin: 1.5rem auto;
    max-width: 400px;
}

.fng-answer-input {
    width: 160px;
    padding: 0.875rem 1rem;
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    border: 3px solid var(--fng-gray-300);
    border-radius: 12px;
    font-family: var(--fng-font-mono);
    color: var(--fng-gray-900);
    transition: var(--fng-transition);
    box-shadow: var(--fng-shadow);
}

.fng-answer-input:focus {
    outline: none;
    border-color: var(--fng-primary);
    box-shadow: 0 0 0 4px var(--fng-primary-lighter);
}

.fng-submit-btn {
    display: inline-block;
    margin-left: 0.75rem;
    padding: 0.875rem 1.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    background: var(--fng-primary);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--fng-transition);
    box-shadow: var(--fng-shadow);
    vertical-align: bottom;
}

.fng-submit-btn:hover {
    background: var(--fng-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--fng-shadow-lg);
}

/* ==================== MULTIPLE CHOICE OPTIONS ==================== */
.fng-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    max-width: 520px;
    margin: 0 auto;
}

.fng-option-btn {
    background: white;
    border: 2px solid var(--fng-gray-200);
    border-radius: 12px;
    padding: 1.5rem 1rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--fng-gray-900);
    cursor: pointer;
    box-shadow: var(--fng-shadow);
    transition: var(--fng-transition-fast);
    position: relative;
    font-family: var(--fng-font-family);
}

.fng-option-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--fng-shadow-lg);
    border-color: var(--fng-primary);
    background: var(--fng-primary-lighter);
}

.fng-option-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.fng-option-btn.fng-opt-correct {
    background: var(--fng-success-light);
    border-color: var(--fng-success);
}

.fng-option-btn.fng-opt-incorrect {
    background: var(--fng-error-light);
    border-color: var(--fng-error);
}

/* ==================== VISUAL PATTERN (Array/Grid) ==================== */
.fng-visual-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    margin: 1.5rem auto;
    max-width: 600px;
}

.fng-dot-grid {
    display: inline-grid;
    gap: 6px;
    padding: 1.5rem;
    background: white;
    border-radius: 14px;
    border: 2px solid var(--fng-gray-200);
    box-shadow: var(--fng-shadow-md);
}

.fng-dot {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    animation: fngDotPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes fngDotPop {
    from { transform: scale(0); }
    to   { transform: scale(1); }
}

.fng-visual-label {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--fng-gray-800);
    font-family: var(--fng-font-mono);
}

/* ==================== SPEED DRILL ==================== */
.fng-countdown-bar {
    width: 100%;
    height: 8px;
    background: var(--fng-gray-200);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.fng-countdown-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.15s linear, background-color 0.5s ease;
    background: var(--fng-success);
}

.fng-countdown-fill.fng-countdown-warn {
    background: var(--fng-warning);
}

.fng-countdown-fill.fng-countdown-danger {
    background: var(--fng-error);
}

/* ==================== MISSING NUMBER ==================== */
.fng-equation {
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    margin: 2rem 0;
    color: var(--fng-gray-900);
    font-family: var(--fng-font-mono);
}

.fng-blank {
    display: inline-block;
    min-width: 80px;
    border-bottom: 4px solid var(--fng-primary);
    margin: 0 0.25rem;
    color: var(--fng-primary);
}

/* ==================== REVERSE MODE ==================== */
.fng-reverse-problem {
    text-align: center;
    margin: 1.5rem auto;
    max-width: 500px;
}

.fng-reverse-answer {
    font-size: 4rem;
    font-weight: 700;
    color: var(--fng-primary-dark);
    font-family: var(--fng-font-mono);
    margin-bottom: 0.5rem;
}

.fng-reverse-hint {
    font-size: 1rem;
    color: var(--fng-gray-500);
}

/* ==================== MATCHING (for Reverse mode options) ==================== */
.fng-problem-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    max-width: 520px;
    margin: 1.5rem auto;
}

.fng-problem-btn {
    background: white;
    border: 2px solid var(--fng-gray-200);
    border-radius: 12px;
    padding: 1.25rem 1rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--fng-gray-900);
    cursor: pointer;
    box-shadow: var(--fng-shadow);
    transition: var(--fng-transition-fast);
    font-family: var(--fng-font-mono);
}

.fng-problem-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--fng-shadow-lg);
    border-color: var(--fng-primary);
    background: var(--fng-primary-lighter);
}

.fng-problem-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

/* ==================== FEEDBACK ==================== */
.fng-feedback {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    font-size: 3rem;
    font-weight: 700;
    z-index: 1000;
    pointer-events: none;
    transition: var(--fng-transition);
}

.fng-feedback.fng-feedback-show {
    transform: translate(-50%, -50%) scale(2);
    opacity: 0;
}

.fng-feedback-correct {
    color: var(--fng-success);
    filter: drop-shadow(0 2px 8px rgba(125, 184, 141, 0.5));
}

.fng-feedback-incorrect {
    color: var(--fng-error);
    filter: drop-shadow(0 2px 8px rgba(199, 107, 107, 0.5));
}

/* ==================== RESULTS SCREEN ==================== */
.fng-results-card {
    background: white;
    border: 2px solid var(--fng-gray-200);
    border-radius: 14px;
    padding: 2rem;
    margin: 2rem auto;
    max-width: 520px;
    box-shadow: var(--fng-shadow-lg);
}

.fng-result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    margin: 0.75rem 0;
    background: var(--fng-gray-50);
    border-radius: 10px;
    border: 1px solid var(--fng-gray-200);
}

.fng-result-label {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--fng-gray-700);
}

.fng-result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--fng-primary-dark);
}

.fng-name-entry {
    text-align: center;
    margin: 2rem 0;
}

.fng-name-entry input {
    width: 100%;
    max-width: 400px;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--fng-gray-200);
    border-radius: 10px;
    margin-bottom: 1rem;
    font-family: var(--fng-font-family);
    transition: var(--fng-transition);
}

.fng-name-entry input:focus {
    outline: none;
    border-color: var(--fng-primary);
    box-shadow: 0 0 0 3px var(--fng-primary-lighter);
}

/* ==================== LEADERBOARD ==================== */
.fng-leaderboard {
    margin: 2rem 0;
}

.fng-leaderboard h3 {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--fng-gray-900);
    margin-bottom: 1.5rem;
}

.fng-leaderboard-table {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    border-collapse: separate;
    border-spacing: 0;
    box-shadow: var(--fng-shadow);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--fng-gray-200);
}

.fng-leaderboard-table thead {
    background: linear-gradient(135deg, var(--fng-primary), var(--fng-primary-dark));
    color: white;
}

.fng-leaderboard-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.fng-leaderboard-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--fng-gray-200);
    color: var(--fng-gray-700);
}

.fng-leaderboard-table tbody tr {
    background: white;
    transition: background 0.15s ease;
}

.fng-leaderboard-table tbody tr:nth-child(odd) {
    background: var(--fng-gray-50);
}

.fng-leaderboard-table tbody tr:hover {
    background: var(--fng-primary-lighter);
}

.fng-leaderboard-table tbody tr:last-child td {
    border-bottom: none;
}

.fng-no-scores {
    text-align: center;
    padding: 3rem 1.5rem;
    color: var(--fng-gray-500);
    font-size: 1.125rem;
}

/* ==================== BUTTONS ==================== */
.fng-primary-btn,
.fng-secondary-btn,
.fng-back-btn {
    border: none;
    border-radius: 10px;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--fng-transition);
    box-shadow: var(--fng-shadow);
    margin: 0.5rem 0.25rem;
    font-family: var(--fng-font-family);
}

.fng-primary-btn {
    background: var(--fng-primary);
    color: white;
    border: 2px solid var(--fng-primary);
}

.fng-primary-btn:hover {
    background: var(--fng-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--fng-shadow-lg);
}

.fng-secondary-btn {
    background: white;
    color: var(--fng-gray-900);
    border: 2px solid var(--fng-gray-300);
}

.fng-secondary-btn:hover {
    background: var(--fng-gray-50);
    border-color: var(--fng-gray-400);
    transform: translateY(-2px);
    box-shadow: var(--fng-shadow-lg);
}

.fng-back-btn {
    background: white;
    color: var(--fng-gray-700);
    border: 2px solid var(--fng-gray-300);
}

.fng-back-btn:hover {
    background: var(--fng-gray-100);
    border-color: var(--fng-gray-400);
}

.fng-primary-btn:active,
.fng-secondary-btn:active,
.fng-back-btn:active {
    transform: translateY(0);
    box-shadow: var(--fng-shadow-sm);
}

.fng-primary-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.fng-result-buttons {
    text-align: center;
    margin-top: 2rem;
}

/* ==================== ANIMATIONS ==================== */
@keyframes fngShake {
    0%, 100% { transform: translateX(0); }
    25%      { transform: translateX(-8px); }
    75%      { transform: translateX(8px); }
}

@keyframes fngCelebrate {
    0%, 100% { transform: scale(1) rotate(0deg); }
    25%      { transform: scale(1.05) rotate(-3deg); }
    75%      { transform: scale(1.05) rotate(3deg); }
}

.fng-celebrate {
    animation: fngCelebrate 0.6s ease-in-out;
}

/* Streak indicator */
.fng-streak {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--fng-warning);
    animation: fngScaleIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    margin-bottom: 1rem;
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 768px) {
    .fng-container { padding: 1.5rem; }
    .fng-screen    { padding: 1.5rem; }
    .fng-title     { font-size: 2rem; }
    .fng-screen-title { font-size: 1.75rem; }
    .fng-mode-buttons { grid-template-columns: 1fr; }

    .fng-game-stats {
        flex-direction: column;
        gap: 0.75rem;
    }
    .fng-stat { font-size: 0.875rem; }

    .fng-magnet-tile {
        min-width: 60px;
        min-height: 60px;
        font-size: 1.25rem;
    }

    .fng-tile-grid {
        grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
        gap: 0.75rem;
        padding: 1rem;
    }

    .fng-question-value { font-size: 2.5rem; }
    .fng-options        { grid-template-columns: 1fr; }
    .fng-option-btn     { font-size: 1.25rem; padding: 1.25rem 1rem; }
    .fng-problem-options { grid-template-columns: 1fr; }

    .fng-equation { font-size: 2rem; }
    .fng-reverse-answer { font-size: 3rem; }

    .fng-table-grid {
        grid-template-columns: repeat(auto-fill, minmax(55px, 1fr));
    }
    .fng-table-btn { min-width: 55px; min-height: 55px; font-size: 1.1rem; }

    .fng-dot { width: 18px; height: 18px; }
    .fng-dot-grid { gap: 4px; padding: 1rem; }

    .fng-leaderboard-table { font-size: 0.875rem; }
    .fng-leaderboard-table th,
    .fng-leaderboard-table td { padding: 0.75rem 0.5rem; }

    .fng-mode-btn { padding: 1.5rem 1rem; }
    .fng-mode-icon { font-size: 2.5rem; }
}

@media (max-width: 480px) {
    .fng-container { padding: 1rem; }
    .fng-screen    { padding: 1.25rem; }
    .fng-title     { font-size: 1.75rem; }
    .fng-subtitle  { font-size: 1rem; }
    .fng-screen-title { font-size: 1.5rem; }

    .fng-magnet-tile {
        min-width: 50px;
        min-height: 50px;
        font-size: 1rem;
    }

    .fng-tile-grid {
        grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
        gap: 0.5rem;
    }

    .fng-question-value { font-size: 2rem; }
    .fng-equation       { font-size: 1.75rem; }
    .fng-answer-input   { width: 120px; font-size: 1.5rem; }
}

/* ==================== ACCESSIBILITY ==================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.fng-mode-btn:focus,
.fng-magnet-tile:focus,
.fng-option-btn:focus,
.fng-problem-btn:focus,
.fng-table-btn:focus,
.fng-primary-btn:focus,
.fng-secondary-btn:focus,
.fng-back-btn:focus,
.fng-submit-btn:focus {
    outline: 3px solid var(--fng-primary-light);
    outline-offset: 2px;
}

/* ==================== UTILITY ==================== */
.fng-text-center { text-align: center; }
.fng-mt-1 { margin-top: 0.5rem; }
.fng-mt-2 { margin-top: 1rem; }
.fng-mt-3 { margin-top: 1.5rem; }
.fng-mb-1 { margin-bottom: 0.5rem; }
.fng-mb-2 { margin-bottom: 1rem; }
.fng-mb-3 { margin-bottom: 1.5rem; }