/* style.css */

/* Include padding in element widths, so nothing overflows on small screens */
*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0 auto;          /* Centers the page */
    max-width: 1000px;
    padding: 20px;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.5;        /* Was 1.223; more comfortable for paragraphs */
    color: #222;
}

img {
    max-width: 100%;
    height: auto;
}

/* Links in the main text: one consistent color instead of browser blue/purple */
main a {
    color: #0064a4;
    text-underline-offset: 2px;
}

.container {
    display: flex;
    flex-direction: row;
    gap: 20px;
}

nav {
    flex: 1;
    background-color: #F6FDFF;
    padding: 20px;
    min-width: 200px;
    max-width: 260px;
}

main {
    flex: 3;
    padding: 20px;
    min-width: 0;            /* Lets long titles wrap instead of stretching the layout */
}

section {
    margin-bottom: 2em;
}

/* Sidebar navigation */
nav ul {
    list-style-type: none;
    padding: 0;
    position: sticky;
    top: 20px;
}

nav ul li a {
    display: block;
    padding: 10px;
    text-decoration: none;
    color: black;
    transition: background-color 0.3s;
}

/* Hover and keyboard focus: dark text stays readable on the light blue */
nav ul li a:hover,
nav ul li a:focus-visible {
    background-color: #b3e0ff;
    color: black;
}

/* Small screens: stack sidebar above content, both full width */
@media (max-width: 800px) {
    .container {
        flex-direction: column;
    }

    nav, main {
        width: 100%;
        max-width: none;
    }

    nav ul {
        position: static;
    }
}

@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}