/* TRACE Boardviewer site — static, no build step, no external assets. */
:root {
  --bg: #0f1216; --bg-2: #161b22; --bg-3: #1d242e; --line: #2a3340;
  --fg: #e6edf3; --fg-2: #a9b4c0; --fg-3: #8590a0;
  --accent: #3fb6a8; --accent-2: #8ad4cb; --on-accent: #06201d;
  --warn: #e3b341; --danger: #f07178; --ok: #5fcf8a; --chip-mix: 60%;
  --radius: 10px; --max: 1100px; --gutter: 16px;
  --mono: ui-monospace, "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
/* Light theme: every text colour reaches 4.5:1 on --bg, --bg-2 and --bg-3; the coloured chip borders reach 3:1. */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f6f8fa; --bg-2: #ffffff; --bg-3: #eef1f5; --line: #d8dee6;
    --fg: #1f2733; --fg-2: #46525f; --fg-3: #5f6b78;
    --accent: #0b6f66; --accent-2: #085a52; --on-accent: #ffffff;
    --warn: #8a5a00; --danger: #b3261e; --ok: #1f7a3c; --chip-mix: 70%;
  }
}
:root[data-theme="light"] {
  --bg: #f6f8fa; --bg-2: #ffffff; --bg-3: #eef1f5; --line: #d8dee6;
  --fg: #1f2733; --fg-2: #46525f; --fg-3: #5f6b78;
  --accent: #0b6f66; --accent-2: #085a52; --on-accent: #ffffff;
  --warn: #8a5a00; --danger: #b3261e; --ok: #1f7a3c; --chip-mix: 70%;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.55 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
code, kbd, .mono { font-family: var(--mono); font-size: 0.92em; }
kbd { background: var(--bg-3); border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
header.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; align-items: center; gap: 14px; min-height: 56px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: 0.02em; color: var(--fg); }
.brand img { width: 28px; height: 28px; flex: none; }
nav.main { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
nav.main a, .btn { display: inline-block; padding: 7px 12px; border-radius: 8px; color: var(--fg-2); }
nav.main a:hover { background: var(--bg-3); color: var(--fg); text-decoration: none; }
.btn { background: var(--bg-3); border: 1px solid var(--line); color: var(--fg); cursor: pointer; font: inherit; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); font-weight: 700; }
.btn.primary:hover { background: var(--accent-2); border-color: var(--accent-2); text-decoration: none; }
.btn[aria-disabled="true"] { background: var(--bg-3); border-color: var(--line); color: var(--fg-2); cursor: default; font-weight: 600; }
.btn[aria-disabled="true"]:hover { text-decoration: none; }
.btn.small { padding: 4px 9px; font-size: 0.9em; }
.btn.dl { display: inline-flex; align-items: center; gap: 10px; text-align: left; line-height: 1.2; }
.btn.dl .os-icon { width: 20px; height: 20px; flex: none; fill: currentColor; }
.btn.dl small { display: block; font-weight: 400; font-size: 0.8em; opacity: 0.85; }
.hero .cta .btn.dl { padding: 9px 15px; }
@media (max-width: 520px) { .hero .cta .btn.dl { flex: 1 1 100%; } }
.toggles { display: flex; gap: 6px; }
.hero { padding: 64px 0 40px; border-bottom: 1px solid var(--line); background: radial-gradient(1200px 400px at 20% -10%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 70%); }
.hero h1 { font-size: clamp(30px, 5vw, 48px); line-height: 1.1; margin: 0 0 12px; letter-spacing: -0.01em; }
.hero p.lead { font-size: clamp(17px, 2.2vw, 20px); color: var(--fg-2); max-width: 760px; margin: 0 0 24px; }
.hero .cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.meta, .card .meta { color: var(--fg-3); font-size: 0.92em; }
.hero .meta { margin-top: 14px; }
.meta code { color: var(--fg-2); }
.meta .item:not([hidden]) ~ .item:not([hidden])::before { content: " · "; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; padding: 0; list-style: none; }
.badge { font-size: 0.82em; padding: 3px 9px; border: 1px solid var(--line); border-radius: 999px; color: var(--fg-2); background: var(--bg-2); }
.badge.warn { border-color: color-mix(in srgb, var(--warn) var(--chip-mix), var(--line)); color: var(--warn); }
section { padding: 48px 0; border-bottom: 1px solid var(--line); }
section h2 { font-size: clamp(22px, 3vw, 30px); margin: 0 0 8px; letter-spacing: -0.01em; }
section p.sub { color: var(--fg-2); margin: 0 0 24px; max-width: 760px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p, .card li { color: var(--fg-2); margin: 0; }
.card ul { margin: 8px 0 0; padding-left: 18px; }
.gallery { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
figure { margin: 0; background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
figure img, figure video { display: block; width: 100%; height: auto; background: #000; aspect-ratio: 16 / 10; object-fit: cover; }
figure figcaption { padding: 10px 12px; font-size: 0.92em; color: var(--fg-2); }
figure figcaption small { display: block; color: var(--fg-3); font-family: var(--mono); font-size: 0.8em; margin-top: 4px; word-break: break-all; }
figure.wide { grid-column: 1 / -1; }
figure.wide img, figure.wide video { aspect-ratio: 16 / 9; }
.shot { display: block; width: 100%; padding: 0; border: 0; background: none; cursor: zoom-in; font: inherit; color: inherit; }
.shot:focus-visible { outline-offset: -3px; }
.lightbox { position: fixed; inset: 0; width: 100%; height: 100%; max-width: none; max-height: none; margin: 0; padding: 20px; border: 0; background: rgba(0,0,0,0.9); color: #fff; z-index: 50; }
.lightbox[open] { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; }
.lightbox::backdrop { background: transparent; }
.lightbox img { max-width: 100%; max-height: calc(100vh - 100px); border-radius: 6px; }
.lightbox-close { position: absolute; top: 14px; right: 14px; width: 40px; height: 40px; border-radius: 50%; border: 1px solid rgba(255,255,255,0.5); background: rgba(0,0,0,0.6); color: #fff; font: 22px/1 var(--sans); cursor: pointer; }
.lightbox-close:focus-visible { outline-color: #fff; }
.lightbox-cap { margin: 0; font-size: 0.92em; color: #fff; text-align: center; max-width: 900px; }
table { width: 100%; border-collapse: collapse; font-size: 0.93em; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--fg-3); font-weight: 600; font-size: 0.85em; text-transform: uppercase; letter-spacing: 0.04em; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-2); }
.status { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 0.82em; border: 1px solid var(--line); white-space: nowrap; }
.status.ok { color: var(--ok); border-color: color-mix(in srgb, var(--ok) var(--chip-mix), var(--line)); }
.status.draft { color: var(--warn); border-color: color-mix(in srgb, var(--warn) var(--chip-mix), var(--line)); }
.status.no { color: var(--fg-3); }
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.steps li { position: relative; padding-left: 44px; color: var(--fg-2); }
.steps li::before { counter-increment: s; content: counter(s); position: absolute; left: 0; top: 0; width: 30px; height: 30px; border-radius: 50%; background: var(--bg-3); border: 1px solid var(--line); display: grid; place-items: center; color: var(--fg); font-weight: 700; font-size: 0.9em; }
pre { background: var(--bg-3); border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; overflow-x: auto; font-size: 0.9em; }
details { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px; margin-bottom: 10px; }
details summary { cursor: pointer; font-weight: 600; }
details p { color: var(--fg-2); margin: 8px 0 0; }
.timeline { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.timeline li { display: grid; grid-template-columns: 150px 1fr; gap: 14px; }
.timeline .when { color: var(--fg-3); font-family: var(--mono); font-size: 0.85em; padding-top: 3px; }
.timeline .what strong { display: block; }
.timeline .what span { color: var(--fg-2); }
.callout { border-left: 3px solid var(--accent); background: var(--bg-2); padding: 12px 16px; border-radius: 0 var(--radius) var(--radius) 0; color: var(--fg-2); }
.callout.warn { border-color: var(--warn); }
footer { padding: 32px 0 48px; color: var(--fg-3); font-size: 0.9em; }
footer .links { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 10px; }
.sr { position: absolute; left: -9999px; }
@media (max-width: 640px) {
  header.top .wrap { flex-wrap: wrap; }
  nav.main { margin-left: 0; width: 100%; }
  .timeline li { grid-template-columns: 1fr; gap: 2px; }
  .hero { padding: 40px 0 28px; }
}
/* guide pages */
nav.main a[aria-current="page"] { background: var(--bg-3); color: var(--fg); }
.crumbs { margin: 0 0 14px; font-size: 0.9em; color: var(--fg-3); }
.crumbs ol { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0; padding: 0; }
.crumbs li + li::before { content: "\203A"; margin-right: 6px; }
.crumbs a { color: var(--fg-2); }
.guide h1 { font-size: clamp(26px, 4.2vw, 40px); }
.guide .meta { margin: 0 0 14px; }
.prose h2 { margin: 40px 0 10px; }
.prose > h2:first-child { margin-top: 0; }
.prose h3 { margin: 22px 0 6px; font-size: 1.05em; }
.prose > p, .prose > ul, .prose > ol, .prose > h2, .prose > h3, .prose > .callout, .prose > .card { max-width: 780px; }
.prose ul, .prose ol:not(.steps) { padding-left: 22px; }
.prose li { margin: 4px 0; }
.prose > .callout, .prose > .card, .prose > .steps, .prose > .table-wrap { margin: 16px 0; }
.prose table { min-width: 560px; }
.prose table.wide { min-width: 900px; }
.prose tbody th { color: var(--fg); font-size: inherit; text-transform: none; letter-spacing: 0; font-weight: 600; }
.prose .sources { font-size: 0.92em; color: var(--fg-3); }
.prose .sources a { color: var(--fg-2); }
.prose p a, .prose li a, .prose td a, .prose .callout a, .guide .lead a, .guide .meta a { text-decoration: underline; text-underline-offset: 2px; }
.prose .cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin: 24px 0 0; }
.prose .cta a.btn { text-decoration: none; }
@media (max-width: 640px) {
  .prose table.wide tbody th { position: sticky; left: 0; background: var(--bg-2); width: 112px; min-width: 112px; font-size: 0.85em; box-shadow: 1px 0 0 var(--line); }
}
/* screenshots inside guide pages, the demo watch page, the changelog and the optional Linux download card */
.prose code { overflow-wrap: anywhere; }
.prose > figure, .prose > .figs { margin: 18px 0; }
.prose > figure { max-width: 780px; }
.figs { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); max-width: 1000px; }
.gallery figure figcaption, .prose figure figcaption { overflow-wrap: anywhere; }
.watch video { display: block; width: 100%; height: auto; aspect-ratio: 16 / 10; background: #000; border-radius: var(--radius); border: 1px solid var(--line); }
.watch { max-width: 960px; }
.timeline a.when { color: var(--accent); }
.release h2 { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; }
.release h2 .meta { font-size: 0.55em; font-weight: 400; letter-spacing: 0; }
.card h4 { margin: 16px 0 6px; font-size: 15px; color: var(--fg); }
.card pre { margin: 8px 0; }
.toc { columns: 2 240px; column-gap: 24px; padding-left: 22px; }
.toc li { break-inside: avoid; }
.meta code { overflow-wrap: anywhere; word-break: break-all; }