/* ===== CHART GAMES UNIFIED STYLES ===== */
/* Mobile-first responsive design with unified dark mode support */

/* ===== UNIFIED CSS VARIABLES & DARK MODE SYSTEM ===== */
:root {
    /* ===== COLOR PALETTE ===== */
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* ===== LIGHT MODE COLORS ===== */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --bg-elevated: #ffffff;
    --bg-overlay: rgba(255, 255, 255, 0.95);
    
    --text-primary: #111827;
    --text-secondary: #374151;
    --text-tertiary: #6b7280;
    --text-muted: #9ca3af;
    --text-inverse: #ffffff;
    
    --border-primary: #e5e7eb;
    --border-secondary: #d1d5db;
    --border-focus: #667eea;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* ===== TYPOGRAPHY ===== */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* ===== SPACING ===== */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* ===== BORDER RADIUS ===== */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    
    /* ===== TRANSITIONS ===== */
    --transition-normal: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    --transition-slow: all 0.5s ease;
}

/* ===== UNIFIED DARK MODE ===== */
@media (prefers-color-scheme: dark) {
    :root {
        /* ===== DARK MODE COLORS ===== */
        --bg-primary: #111827;
        --bg-secondary: #1f2937;
        --bg-tertiary: #374151;
        --bg-elevated: #1f2937;
        --bg-overlay: rgba(31, 41, 55, 0.95);
        
        --text-primary: #f9fafb;
        --text-secondary: #e5e7eb;
        --text-tertiary: #d1d5db;
        --text-muted: #9ca3af;
        --text-inverse: #111827;
        
        --border-primary: #374151;
        --border-secondary: #4b5563;
        --border-focus: #667eea;
        
        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
        --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
        --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }
}

/* ===== BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
}

/* ===== CHART GAME CONTAINER ===== */
.chart-game-container {
    background: var(--bg-elevated);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-primary);
    margin-bottom: var(--space-8);
    max-width: 100%;
    color: var(--text-primary);
}

@media (min-width: 768px) {
    .chart-game-container {
        padding: var(--space-8);
    }
}

/* ===== GAME HEADER ===== */
.chart-game-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.chart-game-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
}

@media (min-width: 768px) {
    .chart-game-title {
        font-size: var(--font-size-3xl);
    }
}

.chart-game-description {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

@media (min-width: 768px) {
    .chart-game-description {
        font-size: var(--font-size-lg);
    }
}

/* ===== NAVIGATION BUTTONS ===== */
.chart-game-header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
    gap: var(--space-4);
}

.back-to-games-btn,
.back-to-selection-btn {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
}

.back-to-games-btn:hover,
.back-to-selection-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-focus);
    color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ===== GAME STATS ===== */
.chart-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
    margin-bottom: var(--space-6);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 768px) {
    .chart-stats {
        gap: var(--space-6);
        max-width: 600px;
    }
}

.chart-stat-item {
    text-align: center;
    padding: var(--space-3);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    transition: var(--transition-normal);
}

.chart-stat-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

@media (min-width: 768px) {
    .chart-stat-item {
        padding: var(--space-4);
    }
}

.chart-stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--space-1);
    font-weight: 500;
}

@media (min-width: 768px) {
    .chart-stat-label {
        font-size: var(--font-size-base);
    }
}

.chart-stat-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

@media (min-width: 768px) {
    .chart-stat-value {
        font-size: var(--font-size-2xl);
    }
}

/* ===== PROGRESS BAR ===== */
.chart-game-progress {
    margin-bottom: var(--space-6);
}

.chart-progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
}

@media (min-width: 768px) {
    .chart-progress-bar {
        height: 8px;
    }
}

.chart-progress-fill {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-lg);
    transition: width 0.3s ease;
    position: relative;
}

.chart-progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ===== CHART DISPLAY AREA ===== */
.chart-display-area {
    margin-bottom: var(--space-6);
}

.chart-question {
    text-align: center;
    margin-bottom: var(--space-6);
    padding: var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
}

.chart-question-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

@media (min-width: 768px) {
    .chart-question-text {
        font-size: var(--font-size-xl);
    }
}

.chart-question-subtitle {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    line-height: 1.5;
}

@media (min-width: 768px) {
    .chart-question-subtitle {
        font-size: var(--font-size-lg);
    }
}

.chart-question-subtitle strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* Highlighted country in question */
.highlighted-country {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4px 8px;
    border-radius: 8px;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
    display: inline-block;
    margin: 0 2px;
}

/* ===== CHART CANVAS ===== */
.chart-canvas-container {
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-6);
    border: 1px solid var(--border-primary);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

@media (min-width: 768px) {
    .chart-canvas-container {
        padding: var(--space-6);
    }
}

@media (min-width: 1024px) {
    .chart-canvas-container {
        padding: var(--space-8);
    }
}

.chart-canvas-container canvas {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== DARK MODE CHART CONTRAST FIXES ===== */
@media (prefers-color-scheme: dark) {
    /* Chart canvas container background */
    .chart-canvas-container {
        background: var(--bg-secondary, #1f2937) !important;
        border-color: var(--border-secondary, #4b5563) !important;
    }
    
    /* Chart canvas background */
    .chart-canvas-container canvas {
        background: var(--bg-secondary, #1f2937) !important;
    }
    
    /* Chart.js specific dark mode overrides */
    .chart-canvas-container canvas {
        filter: brightness(1.1) contrast(1.1);
    }
    
    /* Ensure chart text is readable */
    .chart-canvas-container {
        color: var(--text-primary, #f9fafb) !important;
    }
    
    /* Chart.js grid lines and axes */
    .chart-canvas-container canvas {
        --chart-grid-color: rgba(156, 163, 175, 0.3) !important;
        --chart-text-color: var(--text-primary, #f9fafb) !important;
    }
}

/* ===== CHART OPTIONS ===== */
.chart-options {
    margin-bottom: var(--space-6);
}

.chart-options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
}

@media (min-width: 768px) {
    .chart-options-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: var(--space-6);
    }
}

.chart-option-btn {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    min-height: 48px;
}

.chart-option-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-focus);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.chart-option-btn:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.chart-option-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.chart-option-btn:disabled:hover {
    background: var(--bg-elevated);
    border-color: var(--border-primary);
    transform: none;
    box-shadow: none;
}

.chart-option-btn.selected {
    background: var(--primary-color);
    color: var(--text-inverse);
    border-color: var(--primary-color);
}

.chart-option-btn.correct {
    background: var(--success-color);
    color: var(--text-inverse);
    border-color: var(--success-color);
}

.chart-option-btn.incorrect {
    background: var(--error-color);
    color: var(--text-inverse);
    border-color: var(--error-color);
}

/* ===== DARK MODE OVERRIDES FOR BETTER CONTRAST ===== */
@media (prefers-color-scheme: dark) {
    .chart-option-btn {
        background: #ffffff !important; /* White background for maximum contrast */
        color: #1f2937 !important; /* Dark text for better contrast on light background */
        font-weight: 700 !important; /* Bolder text for better readability */
        border-color: #e0e0e0 !important; /* Light border for visibility */
    }
    
    .chart-option-btn:hover {
        background: #f3f4f6 !important; /* Light gray on hover */
        border-color: #667eea !important; /* Blue border on hover */
        transform: translateY(-2px);
        box-shadow: var(--shadow-md);
    }
    
    .chart-option-btn.predicted {
        background: #ffffff !important;
        color: #1f2937 !important; /* Ensure predicted buttons also have dark text */
    }
    
    .chart-option-btn.selected {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
        color: #ffffff !important; /* White text on selected state */
        border-color: #667eea !important;
    }
    
    .chart-option-btn.correct {
        background: linear-gradient(135deg, #28a745 0%, #20c997 100%) !important;
        color: #ffffff !important;
        border-color: #28a745 !important;
    }
    
    .chart-option-btn.incorrect {
        background: linear-gradient(135deg, #dc3545 0%, #e74c3c 100%) !important;
        color: #ffffff !important;
        border-color: #dc3545 !important;
    }
    
    .country-option {
        background: var(--bg-elevated, #ffffff) !important;
        border-color: var(--border-primary, #e0e0e0) !important;
    }
    
    .country-name {
        color: #1f2937 !important; /* Dark text for maximum contrast */
        font-weight: 700 !important; /* Bold text for better readability */
    }
}

/* ===== CHART FEEDBACK ===== */
.chart-feedback {
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-6);
    text-align: center;
    opacity: 0;
    transform: translateY(-10px);
    transition: var(--transition-normal);
    color: var(--text-primary);
}

.chart-feedback.show {
    opacity: 1;
    transform: translateY(0);
}

.chart-feedback.correct {
    background: rgba(16, 185, 129, 0.15);
    border-color: var(--success-color);
    color: var(--success-color);
}

.chart-feedback.incorrect {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--error-color);
    color: var(--error-color);
}

@media (min-width: 768px) {
    .chart-feedback {
        padding: var(--space-6);
    }
}

.chart-feedback-content h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.chart-feedback-content h4.correct {
    color: var(--success-color);
}

.chart-feedback-content h4.incorrect {
    color: var(--error-color);
}

.chart-feedback-content p {
    font-size: var(--font-size-base);
    line-height: 1.6;
    margin-bottom: var(--space-3);
}

/* ===== CORRELATION STATS ===== */
.chart-correlation-stats {
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-top: var(--space-4);
    text-align: center;
    border: 1px solid var(--border-primary);
}

.chart-correlation-stats span {
    display: inline-block;
    margin: 0 var(--space-2);
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== NAVIGATION BUTTONS ===== */
.chart-next-btn {
    background: var(--primary-color);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    display: block;
    width: 100%;
    max-width: 200px;
    margin: 0 auto;
}

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

.chart-next-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

@media (min-width: 768px) {
    .chart-options {
        margin-bottom: var(--space-8);
    }
    
    .chart-option-btn {
        padding: var(--space-5);
    }
    
    .chart-next-btn {
        padding: var(--space-4) var(--space-8);
    }
}

/* ===== LOADING STATES ===== */
.chart-loading {
    text-align: center;
    padding: var(--space-16) var(--space-4);
}

.chart-loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-4);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.chart-loading-text {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

.chart-loading-subtext {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    text-align: center;
    margin-top: var(--space-2);
    opacity: 0.8;
}

/* ===== ERROR STATES ===== */
.chart-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-align: center;
    margin: var(--space-6) 0;
}

.chart-error-icon {
    font-size: var(--font-size-4xl);
    color: var(--error-color);
    margin-bottom: var(--space-4);
}

.chart-error-text {
    font-size: var(--font-size-lg);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    line-height: 1.6;
}

.chart-error-button {
    background: var(--error-color);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.chart-error-button:hover {
    background: #dc2626;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ===== INDICATOR SELECTION ===== */
.indicator-selection {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--space-10) var(--space-5);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.indicator-selection-header {
    text-align: center;
    margin-bottom: var(--space-10);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
}

.indicator-selection-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.indicator-dropdown-container {
    max-width: 600px;
    margin: 0 auto;
}

.indicator-dropdown {
    background: var(--bg-elevated);
    border: 2px solid var(--border-primary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
}

.indicator-dropdown:hover {
    border-color: var(--border-focus);
    box-shadow: var(--shadow-md);
}

.dropdown-header {
    padding: var(--space-4);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
}

.dropdown-header:hover {
    background: var(--bg-tertiary);
}

.dropdown-label {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-primary);
}

.dropdown-arrow {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    transition: var(--transition-normal);
}

.dropdown-options {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: var(--bg-elevated);
    border-top: 1px solid var(--border-primary);
}

.indicator-dropdown.open .dropdown-options {
    max-height: 600px;
    overflow-y: auto;
}

.indicator-dropdown.open .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-option {
    padding: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    transition: var(--transition-normal);
    border-bottom: 1px solid var(--border-primary);
}

.dropdown-option:last-child {
    border-bottom: none;
}

.dropdown-option:hover {
    background: var(--bg-secondary);
}

.dropdown-option.selected {
    background: var(--primary-color);
    color: var(--text-inverse);
}

.option-icon {
    font-size: var(--font-size-xl);
    width: 24px;
    text-align: center;
}

.option-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.option-name {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: inherit;
}

.option-description {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    line-height: 1.4;
}

.dropdown-option.selected .option-description {
    color: rgba(255, 255, 255, 0.8);
}

/* ===== START GAME BUTTON ===== */
.start-game-btn {
    background: var(--primary-color);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    display: block;
    width: 100%;
    max-width: 300px;
    margin: var(--space-8) auto 0;
}

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

.start-game-btn:disabled {
    background: var(--bg-tertiary);
    color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ===== UNIFIED END GAME SCREEN ===== */
.chart-game-end {
    background: var(--bg-elevated);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    text-align: center;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-primary);
    max-width: 600px;
    margin: 0 auto;
}

.chart-end-header {
    margin-bottom: var(--space-6);
}

.chart-end-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.chart-score-percentage {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: var(--space-2);
}

.chart-score-label-main {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

.chart-final-stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.chart-stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    text-align: center;
    transition: var(--transition-normal);
}

.chart-stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.chart-stat-icon {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
    margin-bottom: var(--space-2);
}

.chart-stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-1);
}

.chart-stat-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.chart-share-result-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-8);
}

.chart-share-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.chart-share-content {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.chart-share-text {
    flex: 1;
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.4;
    word-break: break-all;
}

.chart-share-btn {
    background: var(--primary-color);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    white-space: nowrap;
}

.chart-share-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.chart-end-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.chart-primary-btn,
.chart-secondary-btn {
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    border: none;
}

.chart-primary-btn {
    background: var(--primary-color);
    color: var(--text-inverse);
}

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

.chart-secondary-btn {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
}

.chart-secondary-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-focus);
    color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.chart-btn-icon {
    font-size: var(--font-size-sm);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .chart-game-end {
        padding: var(--space-6);
        margin: var(--space-4);
    }
    
    .chart-end-title {
        font-size: var(--font-size-2xl);
    }
    
    .chart-score-percentage {
        font-size: var(--font-size-4xl);
    }
    
    .chart-final-stats-container {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }
    
    .chart-stat-card {
        padding: var(--space-3);
    }
    
    .chart-primary-btn,
    .chart-secondary-btn {
        padding: var(--space-3) var(--space-4);
        font-size: var(--font-size-sm);
    }
    
    .chart-options-grid {
        grid-template-columns: 1fr;
    }
    
    .chart-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ===== ANIMATIONS ===== */
@keyframes chartFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.chart-card {
    animation: chartFadeIn 0.6s ease-out;
}

.chart-card:nth-child(1) { animation-delay: 0.1s; }
.chart-card:nth-child(2) { animation-delay: 0.2s; }
.chart-card:nth-child(3) { animation-delay: 0.3s; }

.chart-card:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.chart-card:focus:not(:focus-visible) {
    box-shadow: none;
}

/* ===== PRINT STYLES ===== */
@media print {
    .chart-game-container {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    .chart-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
}

/* ===== CORRELATION ANALYZER SPECIFIC STYLES ===== */
.chart-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin: var(--space-6) 0;
}

@media (min-width: 768px) {
    .chart-options {
        gap: var(--space-4);
    }
}





.chart-feedback-content h4 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
    text-align: center;
}

.chart-feedback-content h4.correct {
    color: #10b981;
}

.chart-feedback-content h4.incorrect {
    color: #ef4444;
}

.chart-feedback-content p {
    color: var(--text-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.chart-correlation-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin: var(--space-4) 0;
    padding: var(--space-4);
    background: rgba(102, 126, 234, 0.05);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(102, 126, 234, 0.1);
}

@media (prefers-color-scheme: dark) {
    .chart-correlation-stats {
        background: rgba(102, 126, 234, 0.1);
        border-color: rgba(102, 126, 234, 0.2);
    }
}

.chart-correlation-stats span {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
    color: var(--text-primary);
    font-weight: 500;
}

.chart-next-btn {
    display: block;
    width: 100%;
    padding: var(--space-4) var(--space-6);
    background: linear-gradient(135deg, 
        rgba(102, 126, 234, 0.8) 0%, 
        rgba(118, 75, 162, 0.8) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: var(--space-4);
}

.chart-next-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.chart-next-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

@media (min-width: 768px) {
    .chart-options {
        flex-direction: row;
        justify-content: center;
    }
    
    .chart-option-btn {
        flex: 1;
        max-width: 200px;
    }
    
    .chart-next-btn {
        max-width: 300px;
        margin-left: auto;
        margin-right: auto;
    }
}

/* ===== UNIVERSAL END GAME COMPONENT ===== */
.chart-end-game {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.chart-end-game.show {
    opacity: 1;
    visibility: visible;
}

.chart-end-game-content {
    background: var(--white);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-2xl);
    transform: scale(0.9);
    transition: transform 0.3s ease;
    position: relative;
    overflow: hidden;
}

@media (prefers-color-scheme: dark) {
    .chart-end-game-content {
        background: var(--gray-800);
        color: var(--gray-100);
    }
}

.chart-end-game.show .chart-end-game-content {
    transform: scale(1);
}

.chart-end-game-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.chart-end-game-icon {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--space-4);
    display: block;
}

.chart-end-game-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@media (prefers-color-scheme: dark) {
    .chart-end-game-title {
        color: var(--gray-100);
    }
}

.chart-end-game-score {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: var(--space-6);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.chart-end-game-score-value {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.chart-end-game-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-8);
    padding: var(--space-4);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
}

@media (prefers-color-scheme: dark) {
    .chart-end-game-stats {
        background: var(--gray-700);
    }
}

.chart-end-game-stat {
    text-align: center;
}

.chart-end-game-stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
    display: block;
}

.chart-end-game-stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

@media (prefers-color-scheme: dark) {
    .chart-end-game-stat-label {
        color: var(--gray-400);
    }
}

.chart-end-game-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

.chart-end-game-button {
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    min-width: 120px;
    justify-content: center;
}

.chart-end-game-button.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.chart-end-game-button.secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

@media (prefers-color-scheme: dark) {
    .chart-end-game-button.secondary {
        background: var(--gray-700);
        color: var(--gray-300);
        border-color: var(--gray-600);
    }
}

.chart-end-game-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.chart-end-game-button.primary:hover {
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

/* ===== RESPONSIVE END GAME ===== */
@media (max-width: 768px) {
    .chart-end-game-content {
        padding: var(--space-6);
        margin: var(--space-4);
    }

    .chart-end-game-title {
        font-size: var(--font-size-2xl);
    }

    .chart-end-game-score {
        font-size: var(--font-size-3xl);
    }

    .chart-end-game-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }

    .chart-end-game-actions {
        flex-direction: column;
        gap: var(--space-3);
    }

    .chart-end-game-button {
        width: 100%;
    }
}

/* ===== RACE TO THE TOP SPECIFIC STYLES ===== */
.chart-game-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 768px) {
    .chart-game-stats {
        gap: var(--space-6);
        max-width: 700px;
    }
}

.stat-card {
    text-align: center;
    padding: var(--space-4);
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
    transition: var(--transition-normal);
}

@media (prefers-color-scheme: dark) {
    .stat-card {
        background: var(--gray-700);
        border-color: var(--gray-600);
    }
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-number {
    display: block;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-1);
}

@media (prefers-color-scheme: dark) {
    .stat-number {
        color: var(--gray-100);
    }
}

@media (min-width: 768px) {
    .stat-number {
        font-size: var(--font-size-2xl);
    }
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

@media (prefers-color-scheme: dark) {
    .stat-label {
        color: var(--gray-400);
    }
}

.chart-game-content {
    text-align: center;
}

.chart-question {
    margin-bottom: var(--space-6);
}

.chart-question h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

@media (prefers-color-scheme: dark) {
    .chart-question h3 {
        color: var(--gray-100);
    }
}

.chart-question p {
    font-size: var(--font-size-lg);
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

@media (prefers-color-scheme: dark) {
    .chart-question p {
        color: var(--gray-400);
    }
}

.chart-container {
    margin-bottom: var(--space-6);
    position: relative;
    height: 400px;
}

@media (min-width: 768px) {
    .chart-container {
        height: 500px;
    }
}

.chart-options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
    max-width: 600px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .chart-options-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--space-6);
    }
}

.chart-feedback-rankings {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-top: var(--space-3);
}

.chart-feedback-ranking {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    transition: var(--transition-normal);
}

@media (prefers-color-scheme: dark) {
    .chart-feedback-ranking {
        background: var(--gray-700);
        border-color: var(--gray-600);
    }
}

.chart-feedback-ranking.winner {
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.1), rgba(34, 197, 94, 0.1));
    border-color: var(--success-color);
}

@media (prefers-color-scheme: dark) {
    .chart-feedback-ranking.winner {
        background: linear-gradient(135deg, rgba(74, 222, 128, 0.2), rgba(34, 197, 94, 0.2));
    }
}

.ranking-number {
    font-weight: 700;
    color: var(--gray-900);
    min-width: 30px;
}

@media (prefers-color-scheme: dark) {
    .ranking-number {
        color: var(--gray-100);
    }
}

.ranking-country {
    flex: 1;
    text-align: left;
    font-weight: 500;
    color: var(--gray-700);
    margin-left: var(--space-3);
}

@media (prefers-color-scheme: dark) {
    .ranking-country {
        color: var(--gray-300);
    }
}

.ranking-value {
    font-weight: 600;
    color: var(--gray-600);
    font-size: var(--font-size-sm);
}

@media (prefers-color-scheme: dark) {
    .ranking-value {
        color: var(--gray-400);
    }
}

.chart-feedback-stat-label {
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
    display: block;
}

@media (prefers-color-scheme: dark) {
    .chart-feedback-stat-label {
        color: var(--gray-300);
    }
}

/* ===== RACE CONTROLS ===== */
.race-controls {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    margin-top: var(--space-6);
}

.race-control-btn {
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: var(--transition-normal);
    min-width: 120px;
}

.race-control-btn.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.race-control-btn.secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

@media (prefers-color-scheme: dark) {
    .race-control-btn.secondary {
        background: var(--gray-700);
        color: var(--gray-300);
        border-color: var(--gray-600);
    }
}

.race-control-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.race-control-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.race-control-btn:disabled:hover {
    transform: none;
    box-shadow: none;
}

/* ===== PREDICTION HIGHLIGHTING ===== */
.chart-option-btn.predicted {
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.2), rgba(34, 197, 94, 0.2));
    border-color: var(--success-color);
    box-shadow: 0 0 0 2px rgba(74, 222, 128, 0.3);
}

@media (prefers-color-scheme: dark) {
    .chart-option-btn.predicted {
        background: linear-gradient(135deg, rgba(74, 222, 128, 0.3), rgba(34, 197, 94, 0.3));
    }
}

.prediction-result {
    font-weight: 600;
    color: var(--success-color);
    margin-top: var(--space-2);
    text-align: center;
}

@media (prefers-color-scheme: dark) {
    .prediction-result {
        color: #4ade80;
    }
}

/* ===== RACE PROGRESS ===== */
.race-progress {
    margin: var(--space-6) 0;
    text-align: center;
}

.race-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-3);
}

@media (prefers-color-scheme: dark) {
    .race-progress-bar {
        background: var(--gray-700);
    }
}

.race-progress-fill {
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
    width: 0%;
}

.race-progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

@media (prefers-color-scheme: dark) {
    .race-progress-text {
        color: var(--gray-400);
    }
}

.race-points {
    font-weight: 600;
    color: var(--primary-color);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(102, 126, 234, 0.2);
}

@media (prefers-color-scheme: dark) {
    .race-points {
        background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.2));
        border-color: rgba(102, 126, 234, 0.3);
    }
}

/* ===== UNIFIED END GAME SCREEN STYLES ===== */
.chart-game-end {
    max-width: 800px;
    margin: 0 auto;
    padding: 30px;
    background-image: linear-gradient( 109.6deg,  rgba(204,228,247,1) 11.2%, rgba(237,246,250,1) 100.2% );
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 25px;
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.15),
        0 8px 32px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    color: #2c3e50;
    text-align: center;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    position: relative;
}

.chart-end-header {
    margin-bottom: 40px;
}

.chart-end-title {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 15px;
    color: #2c3e50;
    text-shadow: none;
}

.chart-score-percentage {
    font-size: 4rem;
    font-weight: bold;
    color: #e67e22;
    text-shadow: none;
    animation: pulse 2s infinite;
}

.chart-score-label-main {
    font-size: 1.2rem;
    color: #2c3e50;
    margin-top: 5px;
    font-weight: 600;
}

.chart-final-stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.chart-stat-card {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    padding: 25px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.chart-stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 0.2);
}

.chart-stat-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.5));
}

.chart-stat-label {
    font-size: 1rem;
    color: #2c3e50;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    text-shadow: none;
}

.chart-stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: #e67e22;
    text-shadow: none;
    position: relative;
}

.chart-share-result-section {
    margin-bottom: 40px;
    padding: 30px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.chart-share-title {
    font-size: 1.8rem;
    margin-bottom: 25px;
    color: #e67e22;
    text-shadow: none;
    font-weight: bold;
}

.chart-share-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.chart-share-text {
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 15px;
    padding: 20px;
    font-size: 1rem;
    line-height: 1.6;
    color: #2c3e50;
    max-width: 100%;
    word-wrap: break-word;
    font-family: 'Courier New', monospace;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.chart-share-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 25px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 8px 16px rgba(102, 126, 234, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.chart-share-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(102, 126, 234, 0.4);
    background: linear-gradient(135deg, #5a67d8, #667eea);
}

.chart-end-actions {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

.chart-primary-btn, .chart-secondary-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    border: none;
    border-radius: 25px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 250px;
    justify-content: center;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.chart-primary-btn {
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: #ffffff;
    box-shadow: 0 8px 16px rgba(76, 175, 80, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.chart-primary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(76, 175, 80, 0.4);
    background: linear-gradient(135deg, #45a049, #4CAF50);
}

.chart-secondary-btn {
    background: rgba(255, 255, 255, 0.25);
    color: #2c3e50;
    border: 2px solid rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(10px);
    font-weight: 700;
}

.chart-secondary-btn:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.6);
}

.chart-btn-icon {
    font-size: 1.2rem;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.3));
}

/* Dark mode support for chart end game */
@media (prefers-color-scheme: dark) {
    .chart-game-end {
        background-image: linear-gradient( 109.6deg,  rgba(204,228,247,0.8) 11.2%, rgba(237,246,250,0.9) 100.2% );
        color: #2c3e50;
    }
    
    .chart-stat-card {
        background: rgba(255, 255, 255, 0.1);
        border-color: rgba(255, 255, 255, 0.2);
    }
    
    .chart-stat-card:hover {
        background: rgba(255, 255, 255, 0.15);
    }
    
    .chart-share-result-section {
        background: rgba(255, 255, 255, 0.1);
        border-color: rgba(255, 255, 255, 0.2);
    }
    
    .chart-share-text {
        background: rgba(255, 255, 255, 0.9);
        color: #2c3e50;
    }
    
    .chart-secondary-btn {
        background: rgba(255, 255, 255, 0.15);
        border-color: rgba(255, 255, 255, 0.3);
    }
    
    .chart-secondary-btn:hover {
        background: rgba(255, 255, 255, 0.25);
        border-color: rgba(255, 255, 255, 0.5);
    }
}

/* Mobile responsiveness for chart end game */
@media (max-width: 768px) {
    .chart-game-end {
        padding: 20px;
        margin: 10px;
    }
    
    .chart-end-title {
        font-size: 2rem;
    }
    
    .chart-score-percentage {
        font-size: 3rem;
    }
    
    .chart-final-stats-container {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .chart-stat-card {
        padding: 20px;
    }
    
    .chart-primary-btn, .chart-secondary-btn {
        min-width: 200px;
        padding: 12px 25px;
        font-size: 1rem;
    }
}

/* ===== COUNTRY TREND IDENTIFIER STYLES ===== */

/* Game container */
.game-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-top: 20px;
}

@media (prefers-color-scheme: dark) {
    .game-container {
        background: rgba(31, 41, 55, 0.95);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    }
}

/* Game header */
.game-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.game-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.game-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Game area */
.game-area {
    padding: 30px;
    background: var(--white);
    color: var(--gray-900);
}

@media (prefers-color-scheme: dark) {
    .game-area {
        background: var(--gray-800);
        color: var(--gray-100);
    }
}

/* Loading screen */
.loading-screen {
    text-align: center;
    padding: 60px 20px;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--gray-200);
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@media (prefers-color-scheme: dark) {
    .loading-spinner {
        border-color: var(--gray-600);
        border-top-color: var(--primary-color);
    }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    font-size: 1.2rem;
    color: var(--gray-600);
}

@media (prefers-color-scheme: dark) {
    .loading-text {
        color: var(--gray-400);
    }
}

/* Indicator selection screen - REMOVED CONFLICTING RULE */

.selection-title {
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--gray-900);
}

@media (prefers-color-scheme: dark) {
    .selection-title {
        color: var(--gray-100);
    }
}

.indicators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.indicator-card {
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: 15px;
    padding: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    color: var(--gray-900);
}

@media (prefers-color-scheme: dark) {
    .indicator-card {
        background: var(--gray-700);
        border-color: var(--gray-600);
        color: var(--gray-100);
    }
}

.indicator-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

@media (prefers-color-scheme: dark) {
    .indicator-card:hover {
        box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
    }
}

.indicator-card.selected {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.indicator-name {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.indicator-description {
    font-size: 0.95rem;
    opacity: 0.8;
    line-height: 1.5;
}

.start-game-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.start-game-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.start-game-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Game interface */
.game-interface {
    display: none;
}

.game-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 15px;
}

.game-buttons {
    display: flex;
    gap: 15px;
    align-items: center;
}

.game-stats {
    display: flex;
    gap: 30px;
}

.stat-item {
    text-align: center;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
}

.back-btn {
    background: #6c757d;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: #5a6268;
}

/* Chart container */
.chart-container {
    background: white;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    height: 500px;
    max-height: 500px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.chart-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
    text-align: center;
    color: #333;
}

.chart-canvas {
    max-width: 100%;
    height: 350px;
    flex: 1;
    min-height: 0;
}

/* Country selection */
.country-selection {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.country-option {
    background: var(--bg-elevated, white);
    border: 2px solid var(--border-primary, #e0e0e0);
    border-radius: 15px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.country-option:hover {
    border-color: #667eea;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.country-option.selected {
    border-color: #667eea;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.country-option.correct {
    border-color: #28a745;
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
}

.country-option.incorrect {
    border-color: #dc3545;
    background: linear-gradient(135deg, #dc3545 0%, #e74c3c 100%);
    color: white;
}

.country-flag {
    width: 60px;
    height: 40px;
    margin: 0 auto 10px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.country-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary, #1f2937);
}

/* Submit button */
.submit-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    display: block;
    margin: 0 auto;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Feedback */
.feedback {
    text-align: center;
    padding: 20px;
    margin: 20px 0;
    border-radius: 15px;
    font-size: 1.1rem;
    font-weight: 600;
}

.feedback.correct {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
}

.feedback.incorrect {
    background: linear-gradient(135deg, #dc3545 0%, #e74c3c 100%);
    color: white;
}

/* Next button */
.next-btn {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    display: none;
    margin: 20px auto;
}

.next-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* Game over screen */
.game-over {
    display: none;
    text-align: center;
    padding: 40px;
}

.game-over-title {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #333;
}

.final-score {
    font-size: 1.5rem;
    margin-bottom: 30px;
    color: #667eea;
}

.play-again-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    margin: 10px;
}

.play-again-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* Responsive design */
@media (max-width: 768px) {
    .game-title {
        font-size: 2rem;
    }
    
    .game-area {
        padding: 20px;
    }
    
    .indicators-grid {
        grid-template-columns: 1fr;
    }
    
    .country-selection {
        grid-template-columns: 1fr;
    }
    
    .game-info {
        flex-direction: column;
        gap: 20px;
    }
    
    .game-stats {
        gap: 20px;
    }
}