QPalette bluePalette;

// Backgrounds
QColor windowColor   = QColor(235, 240, 255);  // light blue background
QColor baseColor     = QColor(250, 250, 255);  // entry fields
QColor altBaseColor  = QColor(225, 230, 250);  // alternating rows

// Text colors
QColor textColor     = QColor(0, 0, 50);       // dark navy text
QColor disabledColor = QColor(150, 150, 170);  // muted blue-gray

// Buttons
QColor buttonColor   = QColor(230, 235, 250);  
QColor buttonText    = QColor(0, 0, 80);

// Highlights
QColor linkColor     = QColor(0, 51, 153);     // deep blue link
QColor highlight     = QColor(102, 153, 255);  // selection blue
QColor highlightText = Qt::white;

bluePalette.setColor(QPalette::Window, windowColor);
bluePalette.setColor(QPalette::WindowText, textColor);
bluePalette.setColor(QPalette::Base, baseColor);
bluePalette.setColor(QPalette::AlternateBase, altBaseColor);
bluePalette.setColor(QPalette::Text, textColor);
bluePalette.setColor(QPalette::Button, buttonColor);
bluePalette.setColor(QPalette::ButtonText, buttonText);
bluePalette.setColor(QPalette::BrightText, Qt::white);
bluePalette.setColor(QPalette::Link, linkColor);
bluePalette.setColor(QPalette::Highlight, highlight);
bluePalette.setColor(QPalette::HighlightedText, highlightText);

// Disabled state
bluePalette.setColor(QPalette::Disabled, QPalette::Text, disabledColor);
bluePalette.setColor(QPalette::Disabled, QPalette::ButtonText, disabledColor);
bluePalette.setColor(QPalette::Disabled, QPalette::HighlightedText, disabledColor);

qApp->setPalette(bluePalette);