:root {
  --rot: #e4002b;
  --blau: #043c7c;
  --text: #1d1d1f;
  --grau: #5f6368;
  --hell: #f4f5f7;
  --ok: #1e7e34;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.5;
  font-size: 17px;
}
.wrap { max-width: 640px; margin: 0 auto; padding: 0 16px; }
.top {
  background: var(--rot);
  color: #fff;
  padding: calc(14px + env(safe-area-inset-top)) 0 14px;
  font-size: 16px;
}
h1 { font-size: 26px; margin: 24px 0 12px; }
h2 { font-size: 20px; margin: 0 0 8px; }
section { margin: 16px 0 24px; }
.btn {
  display: inline-block;
  background: var(--blau);
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: 14px 20px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  margin-top: 8px;
}
a.btn { text-align: center; text-decoration: none; }
.btn:disabled { opacity: .6; cursor: wait; }
.btn-ghost { background: #fff; color: var(--blau); border: 2px solid var(--blau); }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row .btn { flex: 1 1 200px; }
.channels { border: 0; padding: 0; margin: 12px 0; }
.channels label {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--hell);
  border-radius: 8px;
  margin-bottom: 8px;
  font-size: 17px;
}
.channels input { width: 22px; height: 22px; accent-color: var(--blau); }
.note { padding: 12px 14px; border-radius: 8px; background: #fff4e5; border-left: 4px solid #f0a020; }
.note.err { background: #fdecee; border-left-color: var(--rot); }
.note.info { background: #eaf2fb; border-left-color: var(--blau); }
.ok { color: var(--ok); font-size: 19px; }
.small { color: var(--grau); font-size: 14px; }
.steps li { margin-bottom: 8px; }
.desktop { border-top: 1px solid #ddd; padding-top: 20px; }
.pair { border-top: 1px solid #ddd; margin-top: 24px; padding-top: 16px; }
.pair .row { align-items: stretch; }
.pair input {
  flex: 1 1 160px;
  font-size: 24px;
  letter-spacing: 6px;
  text-align: center;
  padding: 10px;
  border: 2px solid #ccc;
  border-radius: 8px;
  margin-top: 8px;
}
.code { font-size: 40px; font-weight: 700; letter-spacing: 10px; text-align: center; color: var(--blau); margin: 12px 0 0; }
#qr { display: block; background: #fff; border: 1px solid #ddd; border-radius: 8px; }
.field {
  flex: 1 1 200px;
  font-size: 19px;
  padding: 12px;
  border: 2px solid #ccc;
  border-radius: 8px;
  margin-top: 8px;
}
.code-input { letter-spacing: 6px; text-align: center; font-size: 24px; }
.device { border: 1px solid #ddd; border-radius: 10px; padding: 14px 16px; margin-bottom: 16px; }
.device h2 { font-size: 18px; margin: 0 0 4px; }
.device .channels { margin: 8px 0; }
.device .channels label { padding: 8px 12px; }
.links { margin-top: 24px; }