body {
    background-color: #f8f9fa;
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
}

.card {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 1rem;
}

.card-title {
    color: #2c3e50;
    font-weight: bold;
    margin-bottom: 1.5rem;
}

.table th {
    background-color: #f8f9fa;
    font-weight: bold;
}

.form-label {
    font-weight: 500;
    color: #2c3e50;
}

.table-responsive {
    max-height: 500px;
    overflow-y: auto;
}

#analyticsChart {
    min-height: 400px;
}

.filter-section {
    background-color: #fff;
    padding: 1rem;
    border-radius: 0.25rem;
}

.header {
    background-color: #fff;
    padding: 1rem 0;
    margin-bottom: 2rem;
}