:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --ink: #1b1f24;
  --muted: #5c6773;
  --line: #dfe3e8;
  --accent: #0b5fa5;
  --danger: #b3261e;
  --warn-bg: #fff6e5;
  --warn-line: #e8b84b;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a; --card: #1d2126; --ink: #e8eaed; --muted: #9aa4af;
    --line: #2c3238; --accent: #6fb2ee; --danger: #f2857c;
    --warn-bg: #33291180; --warn-line: #8a6d1f;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans Thai", sans-serif;
  line-height: 1.6;
}
.wrap { max-width: 44rem; margin: 0 auto; padding: 0 1rem; }
header { border-bottom: 1px solid var(--line); background: var(--card); }
header .wrap { display: flex; justify-content: space-between; align-items: center;
  gap: 1rem; flex-wrap: wrap; padding-block: .75rem; }
.brand { font-weight: 600; }
main { padding-block: 1.5rem; }
footer { padding-block: 1.5rem; font-size: .875rem; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: .75rem;
  padding: 1.25rem; margin-bottom: 1.25rem;
}
.card.centered { text-align: center; }
h1 { font-size: 1.35rem; margin-top: 0; }
h2 { font-size: 1.1rem; margin-top: 0; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.error { color: var(--danger); }
.warn {
  background: var(--warn-bg); border: 1px solid var(--warn-line);
  border-radius: .5rem; padding: .6rem .8rem; font-size: .9rem;
}
.pill {
  font-size: .8rem; font-weight: 500; color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px; padding: .1rem .6rem;
  vertical-align: middle;
}

ul#devices { list-style: none; padding: 0; margin: 0; }
li.device {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding: .75rem 0; border-top: 1px solid var(--line);
}
li.device:first-child { border-top: 0; }

label { display: block; margin-bottom: .35rem; }
input {
  width: 100%; padding: .55rem .7rem; font: inherit; color: inherit;
  background: var(--bg); border: 1px solid var(--line); border-radius: .5rem;
  margin-bottom: .75rem;
}
button, .button {
  display: inline-block; font: inherit; cursor: pointer; text-decoration: none;
  padding: .55rem 1rem; border-radius: .5rem; border: 1px solid transparent;
  background: var(--accent); color: #fff;
}
button:disabled { opacity: .5; cursor: not-allowed; }
button.secondary, .button.secondary {
  background: transparent; color: var(--ink); border-color: var(--line);
}
button.danger { background: transparent; color: var(--danger); border-color: var(--line); }

.qr { display: flex; justify-content: center; padding: 1rem 0; }
.qr img, .qr canvas { background: #fff; padding: .5rem; border-radius: .5rem; }

pre#conf-text {
  background: var(--bg); border: 1px solid var(--line); border-radius: .5rem;
  padding: .75rem; overflow-x: auto; font-size: .8rem; user-select: all;
}