:root {
  --bg: #f7f7f8; --panel: #fff; --fg: #17181b; --mut: #6b7076; --line: #e3e5e8;
  --accent: #2f6fd0; --ok: #2f8a52; --warn: #a8730f; --err: #c0392b;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121417; --panel: #1a1d21; --fg: #e8eaed; --mut: #9aa0a6; --line: #2b2f35;
    --accent: #5b9bf5; --ok: #4caf72; --warn: #d5a13c; --err: #e5705f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 15px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 24px; margin: 0 0 6px; }
h2 { font-size: 16px; margin: 22px 0 10px; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .92em; }

nav {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding: 10px 20px; background: var(--panel); border-bottom: 1px solid var(--line);
}
nav .brand { font-weight: 700; letter-spacing: .08em; color: var(--fg); }
nav .ws { color: var(--mut); font-size: 13px; margin-right: 8px; }
nav a { color: var(--mut); font-size: 14px; }
nav a.on { color: var(--fg); font-weight: 600; }
nav .spacer { flex: 1; }
nav form { display: inline; }

main { max-width: 980px; margin: 0 auto; padding: 26px 20px 60px; }
main.centred { display: flex; min-height: 90vh; align-items: center; justify-content: center; }

.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; margin: 14px 0;
}
.card.narrow { width: min(420px, 92vw); }
.cards { display: flex; gap: 12px; flex-wrap: wrap; }
.card.stat { flex: 1 1 160px; margin: 0; }
.card.stat b { display: block; font-size: 26px; font-weight: 650; }
.card.stat span { color: var(--mut); font-size: 13px; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }

label { display: block; margin: 12px 0; font-size: 13px; color: var(--mut); }
input, select, textarea {
  display: block; width: 100%; margin-top: 5px; padding: 9px 11px; font: inherit;
  color: var(--fg); background: var(--bg); border: 1px solid var(--line);
  border-radius: 7px;
}
textarea { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
fieldset { border: 1px solid var(--line); border-radius: 7px; padding: 12px; }
legend { color: var(--mut); font-size: 13px; padding: 0 6px; }

button, .button {
  display: inline-block; padding: 9px 16px; font: inherit; cursor: pointer;
  color: var(--fg); background: var(--panel); border: 1px solid var(--line);
  border-radius: 7px; text-decoration: none;
}
button:hover, .button:hover { border-color: var(--accent); text-decoration: none; }
button.primary, .button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button:disabled { opacity: .45; cursor: not-allowed; }
button.link { background: none; border: none; color: var(--accent); padding: 2px 4px; }
button.link.danger { color: var(--err); }

.row { display: flex; gap: 10px; align-items: flex-end; }
.row.wrap { flex-wrap: wrap; margin: 10px 0; }
.grow { flex: 1; }
.sub { color: var(--mut); font-size: 13.5px; }
.muted { color: var(--mut); font-size: 12.5px; }
.ok { color: var(--ok); } .error { color: var(--err); } .warn { color: var(--warn); }
p.ok, p.error, p.warn {
  padding: 9px 12px; border-radius: 7px; border: 1px solid currentColor; font-size: 14px;
}
.hidden { display: none; }

table { width: 100%; border-collapse: collapse; font-size: 14px; margin-top: 8px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--mut); font-weight: 500; font-size: 13px; }
.tag {
  display: inline-block; padding: 1px 6px; margin: 0 3px 3px 0; font-size: 12px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 4px;
}
dl.stats { display: grid; grid-template-columns: auto 1fr; gap: 4px 16px; font-size: 14px; margin: 14px 0 0; }
dl.stats dt { color: var(--mut); }
dl dt { color: var(--mut); font-size: 13px; margin-top: 8px; }
dl dd { margin: 0; }
ol.steps li { margin-bottom: 8px; }
ul.issues { list-style: none; padding: 0; font-size: 14px; }
ul.issues li { padding: 5px 0; border-bottom: 1px solid var(--line); }
ul.issues li.error { color: var(--err); }
ul.codes { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; list-style: none;
  padding: 12px; background: var(--bg); border-radius: 7px;
  font-family: ui-monospace, monospace; }
.checks { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 4px; }
label.check { display: flex; align-items: center; gap: 8px; margin: 2px 0; color: var(--fg); }
label.check input { width: auto; margin: 0; }
.qr { display: flex; justify-content: center; padding: 14px; background: #fff; border-radius: 8px; }
.qr svg { width: 200px; height: 200px; }
.secret { display: block; padding: 8px; background: var(--bg); border-radius: 6px;
  letter-spacing: .1em; text-align: center; }
.transcript { font-family: ui-monospace, monospace; font-size: 13px; color: var(--mut);
  background: var(--bg); padding: 12px; border-radius: 7px; min-height: 3em; }

/* ---------------------------------------------------------------- capture */
.state {
  font-size: 22px; font-weight: 700; letter-spacing: .12em; padding: 16px;
  text-align: center; border-radius: 8px; margin-bottom: 12px;
}
.state.idle { background: var(--bg); color: var(--mut); }
.state.live { background: var(--ok); color: #fff; }
.state.warn { background: var(--warn); color: #fff; }
.state.error { background: var(--err); color: #fff; }
.vu { height: 14px; background: var(--bg); border-radius: 7px; overflow: hidden; }
.vu div { height: 100%; width: 0; background: var(--mut); transition: width .12s linear; }
.vu div.ok { background: var(--ok); }
.meter { height: 10px; background: var(--bg); border-radius: 5px; overflow: hidden; margin: 10px 0; }
.meter div { height: 100%; width: 0; background: var(--mut); transition: width .3s; }
.meter div.ok { background: var(--ok); }
.meter div.mid { background: var(--warn); }
.meter div.low { background: var(--err); }
.monitor .now { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.monitor .now b { display: block; font-size: 20px; }
.monitor .lbl { color: var(--mut); font-size: 12px; }

/* ---------------------------------------------------------------- display */
body.display {
  background: #000; color: #fff; height: 100vh; overflow: hidden; margin: 0;
  display: flex; align-items: center; justify-content: center;
}
body.display #stage {
  width: 100vw; height: 100vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 4vh 5vw;
}
body.display #lyrics {
  flex: 1; width: 100%; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: .35em;
  font-size: 6.5vw; font-weight: 650; line-height: 1.18; text-align: center;
  text-wrap: balance; overflow: hidden;
  transition: opacity .22s ease;
}
body.display #lyrics.blank { opacity: 0; }
body.display #lyrics.shown { opacity: 1; }
body.display #credit {
  flex: 0 0 auto; font-size: 1.5vh; color: #8b8b8b; letter-spacing: .04em;
  padding-top: 2vh; text-align: center;
}
body.display .offline {
  position: fixed; top: 10px; right: 12px; width: 9px; height: 9px;
  border-radius: 50%; background: #c0392b; opacity: .75;
}
body.display .hint {
  position: fixed; bottom: 10px; left: 0; right: 0; text-align: center;
  font-size: 12px; color: #4a4a4a; transition: opacity 1s;
}
body.display .hint.gone { opacity: 0; }

.diagnosis {
  padding: 11px 14px; border-radius: 8px; font-size: 14.5px; margin: 6px 0 14px;
  background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--mut);
}
.diagnosis.tracking      { border-left-color: var(--ok); }
.diagnosis.no-match      { border-left-color: var(--warn); }
.diagnosis.no-words      { border-left-color: var(--warn); }
.diagnosis.empty-library { border-left-color: var(--err); }
.diagnosis.no-capture    { border-left-color: var(--err); }