:root {
    --paper: #f2ead8;
    --band: #eae0c9;
    --ink: #1e2a3a;
    --ink-soft: #55606f;
    --rule: #d9cdb2;
}

@media (prefers-color-scheme: dark) {
    :root {
        --paper: #141a22;
        --band: #1b232d;
        --ink: #eae4d8;
        --ink-soft: #a8b0bc;
        --rule: #2a333f;
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 17px;
    line-height: 1.7;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
}

a:focus-visible {
    outline: 2px solid var(--ink);
    outline-offset: 3px;
}

.mark {
    display: block;
    background-color: var(--ink);
    -webkit-mask: url("mark.svg") center / contain no-repeat;
    mask: url("mark.svg") center / contain no-repeat;
}

.label {
    margin: 0 0 0.5rem;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink-soft);
}

.start {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 1.5rem;
}

.start .plate {
    width: 100%;
    max-width: 27.5rem;
}

.start .mark {
    width: 96px;
    height: 96px;
    margin-bottom: 2.125rem;
}

.start h1 {
    margin: 0 0 2.5rem;
    font-size: 2.125rem;
    line-height: 1.25;
    font-weight: normal;
    letter-spacing: -0.01em;
}

.start .field {
    border-top: 1px solid var(--rule);
    padding-top: 1.625rem;
}

.start .field + .field {
    margin-top: 1.625rem;
}

.start .field p:last-child {
    margin: 0;
    font-size: 1.125rem;
}

.start .links {
    display: flex;
    gap: 1.375rem;
}

a.plain {
    color: var(--ink);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 4px;
}

a.plain:hover {
    text-decoration-thickness: 2px;
}

.single {
    max-width: 36rem;
    margin: 0 auto;
    padding: 3.5rem 1.5rem 4rem;
}

.single .mark {
    width: 52px;
    height: 52px;
    margin-bottom: 1.75rem;
}

.single h1 {
    margin: 0 0 1.5rem;
    font-size: 1.75rem;
    line-height: 1.3;
    font-weight: normal;
    letter-spacing: -0.01em;
}

.single p {
    margin: 0 0 0.9rem;
    color: var(--ink-soft);
}

.single nav {
    margin-top: 2.75rem;
    border-top: 1px solid var(--rule);
    padding-top: 1.25rem;
    display: flex;
    gap: 1.25rem;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 0.85rem;
}

.wrap {
    max-width: 70rem;
    margin: 0 auto;
    padding: 0 2rem;
}

.top {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding-top: 1.75rem;
}

.top .brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-grow: 1;
    text-decoration: none;
}

.top .mark {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
}

.top .wordmark {
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 0.78rem;
    letter-spacing: 0.26em;
    text-transform: uppercase;
}

.top nav {
    display: flex;
    gap: 1.375rem;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 0.8rem;
    color: var(--ink-soft);
}

.top nav a {
    text-decoration: none;
}

.top nav a:hover,
.top nav a[aria-current="page"] {
    color: var(--ink);
}

.cols {
    display: grid;
    grid-template-columns: 13.75rem minmax(0, 1fr);
    gap: 4.5rem;
    align-items: start;
    padding: 4rem 0 4rem;
}

.side {
    position: sticky;
    top: 2rem;
}

.side h1 {
    margin: 0 0 1rem;
    font-size: 2.125rem;
    line-height: 1.2;
    font-weight: normal;
}

.side .intro {
    margin: 0;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 0.78rem;
    line-height: 1.7;
    color: var(--ink-soft);
}

.side .toc {
    margin-top: 1.375rem;
    border-top: 1px solid var(--rule);
    padding-top: 0.875rem;
    display: block;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 0.78rem;
    line-height: 2;
    color: var(--ink-soft);
}

.side .toc a {
    display: block;
    text-decoration: none;
}

.side .toc a:hover {
    color: var(--ink);
}

main {
    max-width: 62ch;
}

main h2 {
    margin: 0 0 0.625rem;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--ink-soft);
}

main p {
    margin: 0 0 0.875rem;
    color: var(--ink-soft);
}

main p.plainink {
    color: var(--ink);
}

main p.last {
    margin-bottom: 2.25rem;
}

main code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.85em;
    color: var(--ink);
}

.pagenav {
    border-top: 1px solid var(--rule);
    padding-top: 1.375rem;
    display: flex;
    gap: 1.5rem;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 0.84rem;
}

@media (max-width: 48rem) {
    .cols {
        grid-template-columns: minmax(0, 1fr);
        gap: 2.5rem;
        padding: 2.5rem 0 3rem;
    }

    .side {
        position: static;
    }

    .start .mark {
        width: 76px;
        height: 76px;
    }

    .start h1 {
        font-size: 1.75rem;
    }

    .wrap {
        padding: 0 1.25rem;
    }
}