:root {
  --bg: #f5f6f4; --surface: #ffffff; --ink: #1c2321; --muted: #5d6763; --line: #dfe3e0;
  --accent: #1f6f5c; --accent-ink: #ffffff; --warn: #a86a00; --bad: #b3261e; --good: #2e7d32;
  --radius: 10px; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121614; --surface: #1b201e; --ink: #e6ebe8; --muted: #9aa5a0; --line: #2d3431;
    --accent: #4fb397; --accent-ink: #0d1411; --warn: #e0a83a; --bad: #ef7a72; --good: #74c47a; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-size: 14px; }
.hidden { display: none !important; }
h1 { margin: 0 0 4px; font-size: 22px; }
h2 { margin: 0 0 12px; font-size: 16px; }
.muted { color: var(--muted); } .small { font-size: 12px; } .error { color: var(--bad); min-height: 1em; }
input, select, textarea { width: 100%; font: inherit; color: var(--ink); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; margin-top: 4px; }
textarea { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12.5px; }
label { display: block; margin-bottom: 12px; font-weight: 500; }
label.check { display: flex; gap: 8px; align-items: flex-start; font-weight: 400; margin-bottom: 8px; }
label.check input, th input, td input[type=checkbox] { width: auto; margin: 2px 0 0; }
.hint { display: block; font-weight: 400; color: var(--muted); font-size: 12px; }
fieldset { border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; margin: 0 0 14px; }
legend { padding: 0 6px; font-weight: 600; }
button { font: inherit; border-radius: 8px; padding: 8px 14px; cursor: pointer; border: 1px solid var(--line);
  background: var(--surface); color: var(--ink); }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
button.ghost { background: transparent; }
button.danger-ghost { background: transparent; color: var(--bad); border-color: var(--bad); }
button.danger { background: var(--bad); color: #fff; border-color: var(--bad); }
button.full { width: 100%; }
button:disabled { opacity: .5; cursor: default; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: min(380px, 100%); }
.topbar { display: flex; align-items: center; gap: 16px; padding: 10px 20px; background: var(--surface);
  border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--accent); font-size: 17px; }
nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
.tab { border: none; background: transparent; color: var(--muted); }
.tab.active { color: var(--ink); background: var(--bg); font-weight: 600; }
main { padding: 20px; max-width: 1280px; margin: 0 auto; }
.toolbar { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; flex-wrap: wrap; }
.toolbar input, .toolbar select { width: auto; min-width: 200px; margin: 0; }
.spacer { flex: 1; }
.stats { display: flex; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; min-width: 130px; }
.stat b { display: block; font-size: 20px; }
.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; color: var(--muted); font-weight: 600; white-space: nowrap; }
#device-table tbody tr { cursor: pointer; }
#device-table tbody tr:hover { background: var(--bg); }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; }
.dot.good { background: var(--good); } .dot.warn { background: var(--warn); } .dot.bad { background: var(--bad); }
.pill { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: 12px; border: 1px solid var(--line); margin: 0 4px 4px 0; }
.pill.bad { color: var(--bad); border-color: var(--bad); }
.pill.warn { color: var(--warn); border-color: var(--warn); }
.split { display: flex; gap: 16px; align-items: flex-start; flex-wrap: wrap; }
.split > aside { width: 260px; } .grow { flex: 1; min-width: 300px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 760px) { .grid2 { grid-template-columns: 1fr; } .split > aside { width: 100%; } }
.list { list-style: none; padding: 0; margin: 0 0 12px; }
.list li { padding: 8px 10px; border-radius: 8px; cursor: pointer; display: flex; justify-content: space-between; gap: 8px; }
.list li.active { background: var(--bg); font-weight: 600; }
.actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.qr-box { display: grid; place-items: center; min-height: 260px; border: 1px dashed var(--line); border-radius: var(--radius); margin-bottom: 14px; padding: 12px; text-align: center; }
.qr-box img { width: min(360px, 100%); background: #fff; padding: 8px; border-radius: 8px; }
.steps li { margin-bottom: 6px; }
.drawer { position: fixed; inset: 0; background: rgba(0,0,0,.35); display: flex; justify-content: flex-end; z-index: 10; }
.drawer-panel { width: min(640px, 100%); height: 100%; overflow-y: auto; background: var(--surface); padding: 20px; position: relative; }
.close { position: absolute; top: 14px; right: 14px; }
.kv { display: grid; grid-template-columns: 140px 1fr; gap: 6px 12px; margin: 12px 0 18px; }
.kv dt { color: var(--muted); } .kv dd { margin: 0; word-break: break-word; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.app-row td { font-size: 13px; } .app-row code { font-size: 12px; color: var(--muted); }
hr { border: none; border-top: 1px solid var(--line); margin: 16px 0; }