.fourier-plot-wrap {
    max-width: 760px;
    margin: 1.5em auto;
}

.fourier-plot-canvas {
    display: block;
    width: 100%;
    max-width: 760px;
    border: 1px solid #777;
    border-radius: 6px;
    background: #f7f7f7;
}

.fourier-plot-controls {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 12px;
    padding: 14px 16px;
    border: 1px solid #777;
    border-radius: 6px;
    background: #e9e9e9;
}

.fourier-plot-grid {
    display: block;
}

.fourier-plot-label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #222;
    font-size: 0.95em;
    font-weight: bold;
}

.fourier-plot-input {
    box-sizing: border-box;
    display: block;
    width: 6.5em;
    margin-top: 0;
    padding: 7px 8px;
    border: 1px solid #888;
    border-radius: 4px;
    color: #222;
    background: #fff;
    font: inherit;
}

.fourier-plot-message {
    min-height: 1.2em;
    margin-top: 0;
    color: #555;
    font-size: 0.9em;
}

@media (max-width: 520px) {
    .fourier-plot-controls {
        align-items: flex-start;
        flex-direction: column;
    }
}