body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s ease;
}

.dark-mode {
    background-color: #2e2e2e;
    color: #fff;
}

.dashboard {
    max-width: 800px; /* Adjusted width for centered, vertical layout */
    margin: auto;
    padding: 20px;
    text-align: center;
}

.card-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 20px;
}

.card {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    flex: 1 1 calc(48% - 10px);
    margin: 10px;
    min-width: 150px;
    transition: background 0.3s ease;
}

.card p {
    font-size: 18px;
    margin: 0;
}

.dark-mode .card {
    background: #444;
}

.chart-container {
    display: flex;
    flex-direction: column; /* Stack charts vertically */
    align-items: center;
    gap: 20px;
    margin-top: 20px;
}

canvas {
    width: 100% !important; /* Reset width for full container */
    max-width: 600px; /* Cap maximum width for readability */
    height: auto !important; /* Keep aspect ratio */
    margin: 10px 0;
    border: 1px solid #ddd;
    background-color: #fff;
}

#toggle-dark-mode {
    padding: 10px 15px;
    margin: 10px;
    cursor: pointer;
}