:root {
    color-scheme: dark;
    --bg: #07111f;
    --text: #d8e2ef;
    --muted: #7f91aa;
    --link: #8bbcff;
    --strong: #f4f8ff;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 15px;
    line-height: 1.65;
}

main {
    width: min(680px, calc(100% - 40px));
    margin: 64px auto;
}

.topline {
    color: var(--muted);
    margin-bottom: 36px;
}

h1,
h2,
p,
ol {
    margin-top: 0;
}

h1 {
    color: var(--strong);
    font-size: 28px;
    line-height: 1.2;
    margin-bottom: 6px;
}

h2 {
    color: var(--strong);
    font-size: 18px;
    line-height: 1.25;
    margin: 36px 0 12px;
}

h3 {
    color: var(--strong);
    font-size: 16px;
    line-height: 1.25;
    margin: 28px 0 10px;
}

details {
    margin-bottom: 12px;
}

details summary {
    color: var(--text);
    cursor: pointer;
    user-select: none;
    list-style: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 4px 8px;
    margin-left: -8px;
    border-radius: 4px;
    transition: background-color 0.15s, color 0.15s;
}

details summary:hover {
    color: var(--strong);
    background-color: rgba(255, 255, 255, 0.1);
}

details summary::before {
    content: "▸";
    color: var(--muted);
    font-size: 16px;
    transition: transform 0.15s, color 0.15s;
}

details[open] summary::before {
    transform: rotate(90deg);
    color: var(--strong);
}

details summary::-webkit-details-marker {
    display: none;
}

details p {
    margin: 8px 0 16px 20px;
    padding-left: 12px;
    border-left: 1px solid var(--text);
    color: var(--muted);
}

p {
    margin-bottom: 18px;
}

.subtitle {
    color: var(--muted);
    margin-bottom: 28px;
}

strong {
    color: var(--strong);
    font-weight: 700;
}

ol {
    padding-left: 22px;
    margin-bottom: 22px;
}

li {
    margin-bottom: 6px;
}

a {
    color: var(--link);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.links {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    color: var(--muted);
}

@media (max-width: 520px) {
    main {
        width: min(100% - 28px, 680px);
        margin: 36px auto;
    }
}