:root {
  --bg: #171717;
  --fg: #f2f2f2;
  --dim: #8d8d8d;
  --line: #2c2c2c;
  --well: #101010;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--fg); }
body {
  font: 15px/1.55 ui-monospace, "Cascadia Mono", "Segoe UI Mono", "SF Mono", Consolas, "Sarasa Mono SC", "Noto Sans Mono CJK SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  padding: max(20px, env(safe-area-inset-top)) max(20px, env(safe-area-inset-right)) max(32px, env(safe-area-inset-bottom)) max(20px, env(safe-area-inset-left));
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
a { color: inherit; }
a:hover { text-decoration-thickness: 2px; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--fg); outline-offset: 3px; }
.skip { position: absolute; left: -999px; top: 8px; }
.skip:focus { left: 20px; background: var(--bg); padding: 4px 8px; z-index: 2; }
header {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  max-width: 38rem; margin: 0 auto 28px;
}
.brand { font-size: 13px; text-decoration: none; color: var(--fg); }
.brand:hover { text-decoration: underline; }
.langs { display: flex; }
.langs .act { min-height: 32px; padding: 0 10px; font-size: 12px; }
.langs button[aria-pressed="true"] { background: var(--fg); color: var(--bg); }
nav { max-width: 38rem; margin: 0 auto 8px; }
.track {
  display: flex; align-items: center; list-style: none; margin: 0; padding: 0;
}
.track li { display: contents; }
.tick {
  appearance: none; min-width: 28px; min-height: 28px; padding: 0 6px;
  border: 1px solid var(--fg); background: transparent; color: var(--fg);
  font: inherit; font-size: 11px; font-variant-numeric: tabular-nums; cursor: pointer;
}
.tick[aria-current="step"] { background: var(--fg); color: var(--bg); }
.tick:disabled { opacity: 0.35; cursor: not-allowed; }
.rail { flex: 1; height: 1px; background: var(--line); min-width: 4px; }
.caption {
  max-width: 38rem; margin: 0 auto 28px;
  display: flex; align-items: baseline; gap: 10px;
  color: var(--dim); font-size: 12px; font-variant-numeric: tabular-nums;
}
.caption b { color: var(--fg); font-weight: 600; }
main { max-width: 38rem; margin: 0 auto; }
h1 { font-size: 22px; font-weight: 600; line-height: 1.25; margin: 0 0 12px; text-wrap: balance; }
p { margin: 0 0 10px; color: var(--dim); }
.lead { color: var(--fg); }
strong, kbd, code { color: var(--fg); font-weight: 600; }
kbd, code { font: inherit; border: 1px solid var(--line); padding: 0 5px; }
.list {
  margin: 18px 0 0; padding: 0; list-style: none;
  display: grid; gap: 12px;
}
.list li {
  display: grid; grid-template-columns: 1.25rem 1fr; gap: 10px;
  color: var(--dim);
}
.list li > span:first-child {
  color: var(--fg); font-variant-numeric: tabular-nums;
}
.list p { margin: 0; }
.note { margin-top: 18px; }
.row { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin: 28px 0 0; }
.row-side { display: flex; flex-wrap: wrap; gap: 8px; }
button.act, a.act {
  appearance: none; display: inline-flex; align-items: center; justify-content: center;
  min-height: 40px; padding: 0 14px; border: 1px solid var(--fg);
  background: var(--fg); color: var(--bg); font: inherit; cursor: pointer;
  text-decoration: none;
}
button.act.ghost, a.act.ghost { background: transparent; color: var(--fg); }
button.act:hover, a.act:hover { filter: brightness(1.08); }
button.act:disabled { opacity: 0.35; cursor: not-allowed; filter: none; }
.boards { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 18px 0 0; }
.boards label {
  display: flex; align-items: center; gap: 10px; min-height: 48px; padding: 8px 12px;
  border: 1px solid var(--line); color: var(--fg); cursor: pointer;
}
.boards label:hover, .boards label:has(:focus-visible) { border-color: var(--fg); }
.boards input { accent-color: var(--fg); }
.device {
  margin: 18px 0 0; padding: 12px 14px;
  border: 1px solid var(--line); background: var(--well);
}
.device b { display: block; color: var(--fg); font-weight: 600; }
.device span { display: block; margin-top: 4px; color: var(--dim); font-size: 13px; }
.meter {
  display: grid; grid-template-columns: 1fr auto; gap: 8px 16px; align-items: baseline;
  margin: 22px 0 12px;
}
.meter .bar { grid-column: 1 / -1; height: 2px; background: var(--line); }
.bar > i { display: block; height: 100%; width: 0; background: var(--fg); }
.pct { font-variant-numeric: tabular-nums; color: var(--fg); font-size: 13px; }
.status { margin: 0; font-size: 13px; color: var(--dim); }
.status:empty { display: none; }
.status.ok, .status.bad { color: var(--fg); }
.console { border: 1px solid var(--line); background: var(--well); }
.console-hd {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 0 4px 0 12px; border-bottom: 1px solid var(--line);
}
.console-hd span { color: var(--dim); font-size: 12px; }
.console-hd .act { min-height: 32px; padding: 0 10px; font-size: 12px; border: 0; }
.log {
  margin: 0; height: 13rem; overflow: auto; padding: 6px 0;
  font-size: 12px; line-height: 1.45;
}
.log-row {
  display: grid; grid-template-columns: 2.75rem 1fr; gap: 12px;
  padding: 4px 12px; color: var(--dim);
}
.log-row time {
  font-variant-numeric: tabular-nums; color: var(--dim); opacity: 0.55;
}
.log-row span { overflow-wrap: break-word; }
.log-row.hi, .log-row.bad { color: var(--fg); }
.log-row.hi time, .log-row.bad time { color: var(--dim); }
footer { max-width: 38rem; margin: 48px auto 0; color: var(--dim); font-size: 12px; }
footer a { color: var(--dim); }
@media (max-width: 520px) {
  .boards { grid-template-columns: 1fr; }
  h1 { font-size: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  .bar > i { transition: none; }
}
@media (prefers-reduced-motion: no-preference) {
  .bar > i { transition: width 80ms linear; }
}