/* Shared SPA / no-JS layout: a color directory and firmware controls. */
:root {
    color-scheme: light dark;
    --bg: #f7f8fa;
    --surface: #fff;
    --fg: #222b38;
    --muted: #536174;
    --line: #cdd5df;
    --accent: #1456a6;
    --selected: #e9f1fc;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #131820;
        --surface: #1c2430;
        --fg: #e4eaf2;
        --muted: #adbacc;
        --line: #414e60;
        --accent: #9bc5ff;
        --selected: #253c58;
    }
}
* { box-sizing: border-box; }
html { scroll-padding-top: 6rem; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 system-ui, sans-serif; }
a { color: var(--accent); text-underline-offset: .18em; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.skip-link { position: fixed; top: -5rem; left: 1rem; padding: .5rem; background: var(--surface); z-index: 3; }
.skip-link:focus { top: .5rem; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 2;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: .85rem max(1rem, calc((100vw - 1300px) / 2));
    background: var(--surface);
    border-bottom: 1px solid var(--line);
}
.site-header nav { display: flex; gap: 1.2rem; white-space: nowrap; }
.brand { color: var(--fg); font-weight: 750; text-decoration: none; line-height: 1.3; }
.brand span { display: block; color: var(--muted); font-size: .8rem; font-weight: 400; }
.layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 2rem; max-width: 1300px; margin: auto; padding: 1.6rem 1rem; }
.sidebar { position: sticky; top: 6rem; align-self: start; max-height: calc(100dvh - 7rem); overflow-y: auto; padding-right: .5rem; }
.sidebar h2, .mobile-menu h2 { font-size: .75rem; color: var(--muted); letter-spacing: .04em; text-transform: uppercase; margin: 1.5rem 0 .5rem; border: 0; padding: 0; }
.sidebar ul, .mobile-menu ul { list-style: none; padding: 0; margin: 0 0 1rem; }
.sidebar li a, .mobile-menu li a { display: block; padding: .5rem .65rem; border-radius: .4rem; text-decoration: none; color: var(--fg); }
.sidebar small, .mobile-menu small { display: block; color: var(--muted); font-size: .8rem; }
.sidebar a:hover, .mobile-menu li a:hover, a[aria-current="page"] { background: var(--selected); }
.index-link { display: block; font-size: .9rem; margin: .5rem 0; }
.content { min-width: 0; }
.mobile-menu { display: none; }
main { padding: 0 0 2rem; }
h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); line-height: 1.2; margin: 1rem 0; letter-spacing: -.03em; }
h2 { font-size: 1.35rem; line-height: 1.3; margin: 2.2rem 0 .8rem; padding-top: 1rem; border-top: 1px solid var(--line); }
h3 { line-height: 1.3; }
p { margin: .7rem 0 1rem; }
.lead { color: var(--muted); font-size: 1.1rem; }
.launch-line { font-size: .95rem; background: var(--surface); border: 1px solid var(--line); border-radius: .5rem; padding: .8rem 1rem; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: .9rem; }
.firmware-card {
    display: flex;
    flex-direction: column;
    gap: .35rem;
    padding: 1rem 1.15rem;
    border: 1px solid var(--line);
    border-radius: .65rem;
    color: var(--fg);
    background: var(--surface);
    text-decoration: none;
}
.firmware-card:hover { border-color: var(--accent); background: var(--selected); }
.firmware-card h3 { margin: .4rem 0; font-size: 1.05rem; }
.firmware-card p { margin: 0 0 .5rem; font-size: .9rem; color: var(--muted); }
.card-action { margin-top: auto; font-size: .85rem; color: var(--accent); }
.color-label { display: flex; align-items: center; gap: .5rem; font-size: .9rem; }
.swatch { display: inline-block; flex-shrink: 0; width: .85rem; height: .85rem; border: 1px solid #777; border-radius: 50%; vertical-align: -.05rem; }
.version-labels { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1rem 0; }
.version-label { font-size: .85rem; padding: .3rem .65rem; background: var(--surface); border: 1px solid var(--line); border-radius: .4rem; }
.version-label .swatch { margin-right: .4rem; }
.back-link { font-size: .9rem; }
.conventions { color: var(--muted); font-size: .9rem; margin: 1rem 0; }
summary { cursor: pointer; padding: .4rem 0; }
.page-links { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1.2rem 0; }
.page-links a { border: 1px solid var(--line); border-radius: .4rem; padding: .4rem .7rem; font-size: .9rem; background: var(--surface); text-decoration: none; }
/* GitHub's GFM table wrapper permits horizontal scroll on small screens. */
markdown-accessiblity-table { display: block; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; vertical-align: top; padding: .6rem .75rem; border: 1px solid var(--line); }
th { background: var(--selected); }
td:first-child { min-width: 8rem; }
code { background: var(--surface); padding: .1rem .25rem; border-radius: 3px; overflow-wrap: anywhere; }
.other-firmware { margin-top: 1.7rem; }
.reference-note, #reference-maintenance, footer { color: var(--muted); font-size: .85rem; }
footer { padding: 1rem 0 2rem; border-top: 1px solid var(--line); }
footer a { display: inline-block; margin-left: .5rem; }
@media (max-width: 760px) {
    .layout { display: block; padding-top: .8rem; }
    .sidebar { display: none; }
    .mobile-menu { display: block; background: var(--surface); border: 1px solid var(--line); padding: .4rem .85rem; border-radius: .5rem; margin-bottom: 1.5rem; }
    .mobile-menu > summary { font-weight: 600; }
    .site-header nav { gap: .8rem; font-size: .85rem; }
    .site-header { padding: .7rem 1rem; }
    .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; }
    .firmware-card { padding: .85rem; }
}
@media (max-width: 360px) {
    .cards { grid-template-columns: 1fr; }
}
@media print {
    .site-header, .sidebar, .mobile-menu, .page-links, .skip-link, .back-link, .conventions { display: none; }
    .layout { display: block; padding: 0; }
    body { color: #000; background: #fff; font-size: 11pt; }
    h2 { break-after: avoid; }
    tr { break-inside: avoid; }
}