/* The whole stylesheet. No build step, no framework: one page layout does not need either. */

:root {
    --bg: #ffffff;
    --fg: #1a1a1a;
    --muted: #5a5a5a;
    --rule: #e0e0e0;
    --accent: #0b5fff;
    --code-bg: #f5f5f5;
    --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #16181c;
        --fg: #e6e6e6;
        --muted: #9aa0a6;
        --rule: #2c2f36;
        --accent: #6ea8ff;
        --code-bg: #1e2127;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font);
    line-height: 1.6;
}

a { color: var(--accent); }

/* --- header ------------------------------------------------------------- */

.top {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--rule);
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 2;
}

.brand { font-weight: 700; text-decoration: none; font-size: 1.1rem; }
.version { color: var(--muted); font-family: var(--mono); font-size: 0.85rem; }

.areas { display: flex; gap: 1rem; }
.areas a { text-decoration: none; color: var(--muted); }
.areas a:hover { color: var(--accent); }
.areas a.current { color: var(--fg); font-weight: 600; }
.switcher { margin-left: auto; }
.switcher select {
    font: inherit;
    font-size: 0.85rem;
    background: var(--bg);
    color: var(--fg);
    border: 1px solid var(--rule);
    border-radius: 4px;
    padding: 0.2rem 0.4rem;
}

/* --- layout ------------------------------------------------------------- */

.layout {
    display: grid;
    grid-template-columns: 16rem minmax(0, 1fr);
    gap: 2rem;
    max-width: 76rem;
    margin: 0 auto;
    padding: 1.5rem;
}

.sidebar { font-size: 0.9rem; align-self: start; position: sticky; top: 4rem; }
.sidebar h2 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted);
    margin: 1.25rem 0 0.4rem;
}
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li { margin: 0.15rem 0; }
.sidebar a { text-decoration: none; color: var(--fg); }
.sidebar a:hover { color: var(--accent); }
.sidebar a.here { color: var(--accent); font-weight: 600; }

main { min-width: 0; }

/* --- content ------------------------------------------------------------ */

h1 { font-size: 1.9rem; margin-top: 0; }
h2 { font-size: 1.35rem; margin-top: 2rem; border-bottom: 1px solid var(--rule); padding-bottom: 0.2rem; }
h3 { font-size: 1.1rem; margin-top: 1.5rem; }

code {
    font-family: var(--mono);
    font-size: 0.875em;
    background: var(--code-bg);
    padding: 0.1em 0.3em;
    border-radius: 3px;
}

pre {
    background: var(--code-bg);
    border: 1px solid var(--rule);
    border-radius: 6px;
    padding: 0.75rem 1rem;
    overflow-x: auto;
}

pre code { background: none; padding: 0; font-size: 0.85rem; }

/* Wide tables scroll inside their own box rather than widening the page. */
table { border-collapse: collapse; width: 100%; display: block; overflow-x: auto; margin: 1rem 0; }
th, td { border: 1px solid var(--rule); padding: 0.4rem 0.6rem; text-align: left; vertical-align: top; }
th { background: var(--code-bg); }

blockquote {
    margin: 1rem 0;
    padding: 0.1rem 1rem;
    border-left: 3px solid var(--rule);
    color: var(--muted);
}

/* --- in-page contents --------------------------------------------------- */

.contents {
    border: 1px solid var(--rule);
    border-radius: 6px;
    padding: 0.5rem 1rem;
    margin-bottom: 2rem;
    font-size: 0.9rem;
}
.contents ul { list-style: none; margin: 0; padding: 0; columns: 2; }
.contents a { text-decoration: none; }

/* --- standard library items --------------------------------------------- */

.item { margin: 2.5rem 0; }
.item h2 a { text-decoration: none; color: inherit; }
.kind {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--muted);
    font-weight: 400;
}
.signature { margin: 0.5rem 0; }
.members { border-left: 2px solid var(--rule); padding-left: 1rem; margin-left: 0.25rem; }
.member { margin: 1rem 0; }
.source { color: var(--muted); font-size: 0.8rem; font-family: var(--mono); }

/* --- previous / next ---------------------------------------------------- */

.neighbours {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid var(--rule);
}
.neighbours .next { margin-left: auto; }

@media (max-width: 60rem) {
    .layout { grid-template-columns: minmax(0, 1fr); }
    .sidebar { position: static; }
    .contents ul { columns: 1; }
}

/* --- welcome page ------------------------------------------------------- */

.welcome {
    max-width: 46rem;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}
.welcome h1 { font-size: 2.4rem; margin: 0 0 0.5rem; }
.welcome .lead { color: var(--muted); font-size: 1.1rem; margin: 0 0 2rem; }

.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.card {
    display: block;
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--rule);
    border-radius: 8px;
    text-decoration: none;
    color: var(--fg);
}
.card:hover { border-color: var(--accent); }
.card h2 { margin: 0 0 0.4rem; color: var(--accent); font-size: 1.2rem; border: none; padding-bottom: 0; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.changes { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--rule); }
.changes > h2 { font-size: 1.3rem; }

@media (max-width: 40rem) {
    .cards { grid-template-columns: 1fr; }
    .areas { display: none; }
}