:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --background-color: #f8f9fa;
    --card-color: #ffffff;
    --text-color: #333333;
    --border-color: #e1e1e1;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 10px;
    padding-bottom: 10px;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.description {
    color: #666;
    max-width: 800px;
    margin: 0 auto;
}

.filters {
    background-color: var(--card-color);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: flex-end;
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #555;
}

select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: white;
    font-size: 16px;
}

.charts-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.chart-card {
    background-color: var(--card-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    height: 500px;
}

.chart-title {
    margin-top: 0;
    margin-bottom: 15px;
    color: var(--primary-color);
    text-align: center;
}

canvas {
    width: 100%;
    height: 100%;
}

.data-summary {
    background-color: var(--card-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-top: 30px;
}

.summary-title {
    margin-top: 0;
    color: var(--primary-color);
}

.summary-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.stat-item {
    text-align: center;
    padding: 15px;
    border-radius: 6px;
    background-color: #f1f8ff;
}

.stat-value {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    font-size: 14px;
    color: #666;
}

.first-year-stat {
    background-color: rgba(52, 152, 219, 0.1);
}

.final-year-stat {
    background-color: rgba(46, 204, 113, 0.1);
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: #666;
    font-size: 14px;
}