style.qss

/* General widget font and color setup */
* {
    font-family: "Segoe UI", sans-serif;
    font-size: 12pt;
    color: #2e2e2e;
}

/* Main Window styling */
QWidget {
    background-color: #f0f0f0;
}

/* GroupBox styling */
QGroupBox {
    border: 2px solid #a4c2a8;
    border-radius: 5px;
    margin-top: 1ex;
    font-weight: bold;
    font-size: 12pt;
}

QGroupBox::title {
    subcontrol-origin: margin;
    left: 10px;
    color: #2a5033;
}

/* Button styling */
QPushButton {
    background-color: #8db580;
    color: white;
    border-radius: 5px;
    padding: 5px;
}

QPushButton:hover {
    background-color: #7da476;
}

QPushButton:pressed {
    background-color: #5d7a58;
}

/* Line Edit styling */
QLineEdit {
    padding: 5px;
    background-color: #ffffff;
    border: 1px solid #ccc;
    border-radius: 3px;
}

/* Spin Box and Double Spin Box styling */
QSpinBox, QDoubleSpinBox {
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 3px;
    background-color: #fff;
}

/* Combo Box styling */
QComboBox {
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 3px;
    background-color: #fff;
}

QCheckBox {
    spacing: 5px;
}

QCheckBox::indicator {
    width: 16px;
    height: 16px;
}