/* Base Reset and Box Model */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    /* height: 100%; */
    font-family: system-ui, sans-serif;
    line-height: 1.6;
    /* hack so that the screen isn't scrolling */
    overflow: auto;
}

/* Layout Structure */
header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    height: 4rem;
}

header h1 {
    font-size: 1.5rem;
}

/* Layout Container */
.layout {
    display: grid;
    grid-template-columns: 200px 1fr;
    min-height: calc(100vh - 4rem);
    /* leave space for header */
}

/* Sticky Vertical Nav */
nav {
    background-color: var(--nav-bg);
    color: var(--nav-text);
    padding: 0 1rem;
    height: 100%;
    position: sticky;
    top: 4rem;
    /* keeps it in place under header */
}

nav ul {
    list-style: none;
    padding: 1rem;
}

nav li {
    margin-bottom: 0.75rem;
}

nav a {
    text-decoration: none;
}

a {
    color: var(--nav-text);
    color: inherit;
}

nav a:hover {
    text-decoration: underline;
}

/* Main Content */
main {
    flex: 1;
    padding: 2rem;
    background-color: var(--main-bg);
    color: var(--main-text);
}

body {
    background-color: var(--main-bg);
}

section {
    ul {
        padding-left: 2rem;
    }

    p {
        padding: 1rem 0rem;
    }
}

/* Footer */
footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 0.5rem;
    text-align: center;
    position: absolute;
    bottom: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    font-size: x-small;

    p:not(first) {
        margin-left: 1rem;
    }
}

/* Light Mode (default) */
:root {
    --header-bg: #f0f0f0;
    --header-text: #222;
    --nav-bg: #e0e0e0;
    --nav-text: #333;
    --main-bg: #ffffff;
    --main-text: #111;
    --footer-bg: #f5f5f5;
    --footer-text: #222;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --header-bg: #1f1f1f;
        --header-text: #fafafa;
        --nav-bg: #2a2a2a;
        --nav-text: #eaeaea;
        --main-bg: #121212;
        --main-text: #ffffff;
        --footer-bg: #1f1f1f;
        --footer-text: #d0d0d0;
    }
}