* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
}

header {
    position: sticky;
    top: 0;
    z-index: 1000;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

[hidden] {
    display: none !important;
}