/* overall look & feel */
body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f5f7fa;
}

/* page wrapper */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 1rem;
}

/* controls row */
.controls {
    margin-bottom: 1rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
}

.controls label {
    margin-right: .5rem;
}

.controls select, .controls input {
    padding: 0.3rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#dayControls, #monthControls, #yearControls {
    display: inline-flex;
    align-items: center;
    margin-left: 0.5rem;
}

/* chart area */
canvas {
    width: 100%;
    max-height: 420px;
}

/* unit selection control */
.unit-controls {
    display: flex;
    align-items: center;
    margin-top: 1rem;
}

.unit-controls label {
    margin-right: .5rem;
}

.unit-controls select {
    padding: 0.3rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}