:root {
    font-family: sans-serif;
    line-height: 1.7;

    color-scheme: dark;
    --color-border: #aaa;
    --color-bg: #333;
    --color-bg2: #222;
    --color-bg3: #111;
    --color-fg: #fff;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
}

img {
    display: block;
    max-inline-size: 100%;
    block-size: auto;
}

blockquote {
    margin-inline: 0;
    padding: 1em;
    box-shadow: 0.2em 0.2em 1em rgba(0,0,0,0.3);
    background: var(--color-fg);
    color: var(--color-bg2);
}
blockquote > :first-child {
    margin-block-start: 0;
}
blockquote > :last-child {
    margin-block-end: 0;
}

ul, ol {
    padding-inline-start: 1.5em;
}

table {
    inline-size: 100%;
    border-collapse: collapse;
}
td, th {
    padding: 0.4em;
    border: 1px solid var(--color-border);
    font-weight: normal;
    text-align: start;
    line-height: 1.4;
}
.table-wrapper {
    white-space: nowrap;
    padding: 0;
    overflow: auto;
}

label {
    display: block;
    margin-block-end: 1em;
}

form {
    margin-block: 3rem;
}

fieldset {
    border: 0;
    padding: 0;
    margin: 0;
    margin-block: 1rem;
}

input, textarea, select, button {
    border: 1px solid var(--color-border);
    padding-block: 0.3em;
    padding-inline: 0.75em;
    font-family: inherit;
    font-size: inherit;
    line-height: 1.8;
    background: var(--color-bg2);
    color: var(--color-fg);
    display: block;
}

button {
    cursor: pointer;
}

.form-check {
    display: flex;
    gap: 0.2em;
    margin: 0;
    line-height: 1.2;
    padding-block: 0.3em;
    align-items: center;
}
.form-check input {
    display: inline-block;
    inline-size: 1.2em;
    block-size: 1.2em;
    flex-shrink: 0;
}

ol.alpha {
    list-style: upper-latin;
}

body {
    background-color: var(--color-bg);
    color: var(--color-fg);
    padding: 0;
    margin: 0;
    min-block-size: 100vb;
    display: grid;
    grid-template-rows: min-content 1fr min-content;
}

a {
    color: inherit;
}

.container {
    max-inline-size: 50rem;
    padding-inline: 1rem;
    margin-inline: auto;
}

header,
footer {
    background-color: var(--color-bg2);
    padding-block: 1rem;
}

main {
    padding-block: 1rem 3rem;
}

footer {
    font-size: 90%;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    column-gap: 2em;
    row-gap: 0.5em;
}

.brand {
    font-size: 150%;
    line-height: 1;
    text-decoration: none;
}

nav {
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    column-gap: 1.2em;
}

nav a {
    font-weight: bold;
    text-decoration: none;
}

.banner {
    margin: 0;
}

.banner img {
    inline-size: 100%;
    block-size: 20em;
    max-block-size: 33vb;
    object-fit: cover;
}

figure {
    position: relative;
}

figcaption {
    position: absolute;
    inset-inline-end: 0;
    inset-block-end: 0;
    padding-inline: 0.5em;
    padding-block: 0.1em;
    font-size: 90%;
    background-color: #333a;
    color: var(--color-fg);
}

.paths {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(20em, 1fr));
    gap: 1em;
    margin-block: 2em;
    padding: 0;
    list-style: none;
}

.paths a {
    display: block;
    background-color: var(--color-bg2);
    padding-inline: 1em;
    padding-block: 0.5em;
    text-decoration: none;
}

.paths a:hover {
    background-color: var(--color-bg3);
}

.pdf {
    inline-size: 100%;
    block-size: 80vb;
    margin-block-end: 1em;
    border: 0;
}

.form-if-correct,
.form-if-previous-correct,
.form-if-incorrect {
    display: none;
}
.form-correct .form-if-correct,
.form-incorrect .form-if-incorrect,
.form-correct ~ .form-if-previous-correct {
    display: block;
}
.form-if-incorrect {
    color: #f99;
}

.w-100 {
    inline-size: 100%;
}