:root {
  --bg: #0f1216;
  --card: #171b21;
  --line: #262c34;
  --text: #e6e9ee;
  --muted: #8b95a3;
  --accent: #4c8dff;
  --ok: #37b26d;
  --err: #e05252;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { background: #0b0e12; padding: 2px 6px; border-radius: 6px; font-size: 13px; word-break: break-all; }
h1 { font-size: 22px; margin: 0 0 14px; }
h2 { font-size: 16px; margin: 0 0 10px; }
h3 { font-size: 14px; margin: 14px 0 6px; color: var(--muted); }
.top {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding: 12px 18px; background: #12161b; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand { font-weight: 700; letter-spacing: .5px; }
.menu { display: flex; gap: 14px; flex-wrap: wrap; }
main { max-width: 1080px; margin: 0 auto; padding: 18px; }
footer { color: var(--muted); text-align: center; padding: 24px; font-size: 13px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px; margin-bottom: 16px;
}
.card.narrow { max-width: 420px; margin: 40px auto; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.row { display: flex; gap: 10px; align-items: flex-end; }
.row.wrap { flex-wrap: wrap; }
.plain { list-style: none; padding: 0; margin: 0; }
.plain li { padding: 3px 0; }
.muted { color: var(--muted); font-size: 13px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
input, select {
  background: #0b0e12; color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 10px; font: inherit; min-width: 160px;
}
button {
  background: var(--accent); color: #fff; border: 0; border-radius: 8px;
  padding: 9px 14px; font: inherit; cursor: pointer;
}
button.primary { outline: 2px solid #9dc0ff; }
button.danger { background: #40232a; color: #ffb4b4; }
.btn {
  display: inline-block; background: #223046; color: #cfe0ff; padding: 8px 12px;
  border-radius: 8px; font-size: 14px;
}
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); font-size: 14px; }
th { color: var(--muted); font-weight: 500; }
.flash { padding: 10px 12px; border-radius: 8px; margin-bottom: 14px; }
.flash.ok { background: #16301f; color: #a9e8c3; }
.flash.err { background: #331a1a; color: #ffb4b4; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.dot.on { background: var(--ok); }
.dot.off { background: var(--err); }
.qr { width: 100%; max-width: 260px; background: #fff; border-radius: 10px; padding: 8px; }
@media (max-width: 640px) {
  .top { gap: 10px; }
  .menu { overflow-x: auto; white-space: nowrap; width: 100%; }
  main { padding: 12px; }
  .row { flex-wrap: wrap; }
}