:root {
  --bg: #0f1115; --panel: #171a21; --line: #262b36; --fg: #e6e8ec;
  --muted: #9aa3b2; --accent: #3ba1ff; --on: #2ecc71; --off: #4a5162; --danger: #e5484d;
  --radius: 10px;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
.wrap { max-width: 720px; margin: 0 auto; padding: 24px 16px; }
header.top {
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line); padding: 14px 16px;
}
header.top .brand { font-weight: 700; letter-spacing: .5px; }
header.top nav a { margin-left: 16px; color: var(--muted); }
header.top nav a:hover { color: var(--fg); }
.langswitch { margin-left: 16px; font-size: 13px; color: var(--muted); }
.langswitch a { color: var(--muted); margin: 0; }
.langswitch a:hover { color: var(--accent); }
.langswitch .cur { color: var(--fg); font-weight: 600; }
h1 { font-size: 22px; margin: 0 0 16px; }
h2 { font-size: 16px; margin: 24px 0 12px; color: var(--muted); font-weight: 600; }
.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px; margin-bottom: 14px;
}
.auth { max-width: 380px; margin: 8vh auto; }
label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 4px; }
input[type=text], input[type=email], input[type=password] {
  width: 100%; padding: 10px 12px; background: #0d0f13; color: var(--fg);
  border: 1px solid var(--line); border-radius: 8px; font-size: 15px;
}
button, .btn {
  display: inline-block; cursor: pointer; border: 0; border-radius: 8px;
  padding: 10px 16px; font-size: 15px; font-weight: 600;
  background: var(--accent); color: #06121f;
}
button.secondary, .btn.secondary { background: #222833; color: var(--fg); }
button.danger { background: var(--danger); color: #fff; }
button:disabled { opacity: .5; cursor: default; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.muted { color: var(--muted); }
.err { color: var(--danger); font-size: 14px; margin-top: 12px; min-height: 18px; }
.ok { color: var(--on); font-size: 14px; margin-top: 12px; }
.device { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.device + .device { border-top: 1px solid var(--line); padding-top: 14px; margin-top: 14px; }
.device .name { font-weight: 600; }
.device .meta { font-size: 12px; color: var(--muted); }
.pill { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: #222833; color: var(--muted); }
.toggle { min-width: 64px; text-align: center; }
.toggle.on { background: var(--on); color: #05230f; }
.toggle.off { background: var(--off); color: var(--fg); }
.state-dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 6px; background: var(--off); }
.state-dot.on { background: var(--on); }
form.inline { display: flex; gap: 8px; }
form.inline input { flex: 1; }
.empty { color: var(--muted); text-align: center; padding: 24px 0; }
.channels { margin-top: 12px; border-top: 1px solid var(--line); }
.channel { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 0; }
.channel + .channel { border-top: 1px solid var(--line); }
.channel .ch-name { font-weight: 600; }
.channel .reading { font-variant-numeric: tabular-nums; font-size: 16px; }
.ch-control { display: flex; align-items: center; gap: 8px; }
.ch-pending { color: var(--muted); margin-left: 6px; }
.ch-err { color: var(--danger); margin-left: 6px; }
.toggle.pending { background: #222833; color: var(--muted); cursor: default; min-width: 64px; }
.toggle.failed { outline: 2px solid var(--danger); }
.spinner {
  display: inline-block; width: 14px; height: 14px; vertical-align: middle;
  border: 2px solid rgba(255,255,255,.25); border-top-color: var(--fg);
  border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }