:root {
    --bg: #f4f6fa;
    --card: #ffffff;
    --text: #333333;
    --primary: #6b4eff;
}

body.dark {
    --bg: #121212;
    --card: #1e1e1e;
    --text: #e0e0e0;
    --primary: #9d8cff;
}

body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: background 0.3s, color 0.3s;
}

header {
    background: var(--primary);
    color: white;
    padding: 20px;
    text-align: center;
    position: relative;
}

#themeToggle {
    position: absolute;
    right: 20px;
    top: 20px;
    background: transparent;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: white;
}

.container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}

.controls {
    margin-bottom: 20px;
}

select {
    padding: 8px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.card {
    background: var(--card);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.card p {
    font-size: 28px;
    margin: 10px 0 0;
    color: var(--primary);
}

.charts {
    margin-top: 40px;
    background: var(--card);
    padding: 30px;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

canvas{
    width: 100%;
    height: 400px;
}

@media (max-width: 768px) {
    canvas {
        height: 300px !important;
    }
}