:root {
  --bg: #f4f6f8;
  --card: #fff;
  --text: #1c2430;
  --muted: #6b7684;
  --border: #dde2e8;
  --accent: #128c7e;
  --accent-hover: #0e7065;
  --danger: #c0392b;
  --warn-bg: #fff4d6;
  --ok: #1e9e5a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11161c;
    --card: #1a2129;
    --text: #e6ebf0;
    --muted: #93a0ad;
    --border: #2c3640;
    --warn-bg: #3a3014;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 15px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
header {
  background: var(--accent);
  color: #fff;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
header h1 { font-size: 18px; margin: 0; }
header button { background: rgba(255,255,255,.15); }
header button:hover { background: rgba(255,255,255,.28); }
main { max-width: 860px; margin: 0 auto; padding: 20px 16px 60px; }
nav { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 18px; }
nav button { background: var(--card); color: var(--text); border: 1px solid var(--border); }
nav button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 16px;
}
.card h2 { margin: 0 0 4px; font-size: 17px; }
.hint { color: var(--muted); font-size: 13px; margin: 0 0 14px; }
label { display: block; font-weight: 600; margin: 12px 0 4px; font-size: 14px; }
input, textarea {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 7px;
  font: inherit;
  background: var(--bg);
  color: var(--text);
}
textarea { min-height: 90px; resize: vertical; }
button {
  font: inherit;
  border: 0;
  border-radius: 7px;
  padding: 8px 14px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
button:hover { background: var(--accent-hover); }
button.secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
button.danger { background: var(--danger); }
button:disabled { opacity: .5; cursor: default; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-end; }
.row > * { flex: 1 1 180px; }
.row > button { flex: 0 0 auto; }
table { width: 100%; border-collapse: collapse; }
td, th { text-align: left; padding: 9px 6px; border-bottom: 1px solid var(--border); }
th { font-size: 13px; color: var(--muted); font-weight: 600; }
.empty { color: var(--muted); text-align: center; padding: 20px; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 99px; font-size: 13px; font-weight: 600; }
.badge.connected { background: #d4f5e2; color: #136b3d; }
.badge.qr, .badge.starting { background: #fff0c2; color: #7a5a00; }
.badge.disconnected { background: #fde0dc; color: #8d2318; }
.qr-box { text-align: center; padding: 10px; }
.qr-box img { background: #fff; padding: 10px; border-radius: 10px; max-width: 100%; }
.banner { background: var(--warn-bg); border: 1px solid #e3c25a; border-radius: 8px; padding: 10px 14px; margin-bottom: 16px; }
.msg { margin-top: 10px; font-size: 14px; min-height: 1em; }
.msg.err { color: var(--danger); }
.msg.ok { color: var(--ok); }
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-wrap .card { width: 100%; max-width: 360px; }
.hidden { display: none !important; }