body {
    background: linear-gradient(135deg, #f8faff, #e0e7ff);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
}
.page {
    display: none;
}
.page.active {
    display: block;
}
.tab-content {
    display: none;
}
.tab-content.active {
    display: block;
}