/* Graph and Visualization Styles */
.graph-container, #charts-container {
    background-color: var(--surface-bright, #ffffff);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.graph-container h2, #charts-container h2 {
    margin-top: 0;
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 20px;
    color: var(--on-surface, #202124);
}

.graph-row, .chart-section {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 24px;
}

.graph-card, .chart-container {
    flex: 1;
    min-width: 280px;
    background-color: var(--surface);
    border-radius: var(--border-radius-md);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    padding: 16px;
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
    height: 300px;
}

.graph-card h3, .chart-section h3 {
    font-size: 16px;
    font-weight: 500;
    margin-top: 0;
    margin-bottom: 16px;
    color: var(--primary-color);
}

.chart-wrapper, .chart-container canvas {
    height: 250px;
    position: relative;
}

/* Canvas will be sized by chart.js */
.chart-wrapper canvas, .chart-container canvas {
    width: 100% !important;
    height: 100% !important;
    max-height: 250px;
}

/* Analysis screen specific styles */
#analysis-content {
    padding: 20px;
    overflow-y: auto;
    max-height: calc(100vh - 120px);
}

.analysis-stats {
    background-color: var(--surface);
    padding: 15px;
    border-radius: var(--border-radius-md);
    margin-bottom: 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}

.analysis-stats p {
    margin: 10px 20px;
    font-size: 16px;
}

.analysis-stats strong {
    color: var(--primary-color);
}

/* Chart type specific styles */
#time-per-question-chart {
    height: 400px; /* Taller for bar charts with many questions */
}

#performance-overview-chart, #time-distribution-chart {
    min-height: 300px;
}

/* Graph legends */
.chart-legend {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-top: 16px;
}

.legend-item {
    display: flex;
    align-items: center;
    font-size: 14px;
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    margin-right: 6px;
}

.legend-correct {
    background-color: var(--success-color);
}

.legend-incorrect {
    background-color: var(--danger-color);
}

.legend-unattempted {
    background-color: var(--secondary-color);
}

.legend-time {
    background-color: var(--info-color);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .graph-card {
        min-width: 100%;
    }
    
    .chart-wrapper {
        height: 200px;
    }
}

/* Dark mode adjustments */
.dark-mode .graph-container,
.dark-mode .graph-card {
    background-color: var(--light-card-bg);
    border-color: var(--border-color);
}

.dark-mode .chart-legend {
    color: var(--text-color);
}

/* Time analysis graphs */
.time-distribution-graph .chart-wrapper {
    height: 300px;
}

/* Subject performance comparison */
.subject-comparison-graph .chart-wrapper {
    height: 280px;
}

/* Style for tooltips - will be handled by chart.js but we can add custom styles */
.custom-tooltip {
    background-color: var(--light-card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 8px 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    font-size: 14px;
    color: var(--text-color);
}