:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --border: #dfe3e8;
  --text: #1c2330;
  --muted: #6b7684;
  --accent: #0b6b5e;
  --accent-soft: #e4f2ef;
  --danger: #b3261e;
  --danger-soft: #fbeae8;
  --warn: #8a5a00;
  --warn-soft: #fdf3dd;
  --ok: #1a7f52;
  --ok-soft: #e4f4ec;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .1);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181d;
    --surface: #1c2127;
    --border: #2d343c;
    --text: #e6e9ed;
    --muted: #97a1ac;
    --accent: #4dbfaa;
    --accent-soft: #16302c;
    --danger: #f2807a;
    --danger-soft: #341c1a;
    --warn: #e0b560;
    --warn-soft: #332a16;
    --ok: #68cf9c;
    --ok-soft: #16301f;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
header.topbar {
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 0 24px; display: flex; align-items: center; gap: 28px; flex-wrap: wrap;
  position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 650; letter-spacing: -.01em; padding: 14px 0; white-space: nowrap; }
.brand span { color: var(--accent); }
nav.main { display: flex; gap: 20px; flex-wrap: wrap; flex: 1; }
nav.main a { padding: 14px 0; color: var(--muted); font-weight: 500; border-bottom: 2px solid transparent; }
nav.main a.active, nav.main a:hover { color: var(--text); border-bottom-color: var(--accent); text-decoration: none; }
.whoami { color: var(--muted); font-size: 13px; }
main { max-width: 1180px; margin: 0 auto; padding: 24px 24px 72px; }
h1 { font-size: 22px; margin: 4px 0 20px; letter-spacing: -.015em; }
h2 { font-size: 16px; margin: 28px 0 12px; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px 20px; margin-bottom: 18px;
}
.card.flush { padding: 0; overflow: hidden; }
.grid { display: grid; gap: 18px; }
.grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.stat { text-align: left; }
.stat .num { font-size: 28px; font-weight: 650; letter-spacing: -.02em; }
.stat .lbl { color: var(--muted); font-size: 13px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
th { color: var(--muted); font-weight: 550; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: color-mix(in srgb, var(--accent) 5%, transparent); }
code, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .92em; }
.serial { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .02em; white-space: nowrap; }
.badge {
  display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 12px;
  font-weight: 550; border: 1px solid transparent; white-space: nowrap;
}
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.badge.danger { background: var(--danger-soft); color: var(--danger); }
.badge.neutral { background: var(--bg); color: var(--muted); border-color: var(--border); }
.muted { color: var(--muted); }
.small { font-size: 13px; }
form.inline { display: inline; }
label { display: block; font-size: 13px; font-weight: 550; margin-bottom: 5px; }
input[type=text], input[type=email], input[type=number], input[type=password], input[type=date], select, textarea {
  width: 100%; padding: 9px 11px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--bg); color: var(--text); font: inherit;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
.field { margin-bottom: 15px; }
.field .hint { color: var(--muted); font-size: 12px; margin-top: 4px; }
.row { display: flex; gap: 14px; flex-wrap: wrap; }
.row > * { flex: 1 1 200px; }
.btn {
  display: inline-block; padding: 9px 16px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-weight: 550; cursor: pointer;
}
.btn:hover { background: var(--bg); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.danger { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, var(--border)); }
.btn.small { padding: 5px 10px; font-size: 13px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 8px; }
.flash { padding: 11px 16px; border-radius: 8px; margin-bottom: 16px; border: 1px solid transparent; }
.flash.ok { background: var(--ok-soft); color: var(--ok); border-color: color-mix(in srgb, var(--ok) 30%, transparent); }
.flash.error { background: var(--danger-soft); color: var(--danger); border-color: color-mix(in srgb, var(--danger) 30%, transparent); }
.flash.info { background: var(--accent-soft); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.toolbar { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 16px; }
.toolbar form { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; }
.toolbar .field { margin: 0; }
.spacer { flex: 1; }
dl.kv { display: grid; grid-template-columns: max-content 1fr; gap: 7px 20px; margin: 0; font-size: 14px; }
dl.kv dt { color: var(--muted); }
dl.kv dd { margin: 0; }
.login-wrap { max-width: 380px; margin: 9vh auto; }
.serial-box {
  background: var(--accent-soft); border: 1px dashed var(--accent); border-radius: 8px;
  padding: 14px 16px; font-family: ui-monospace, Menlo, monospace; font-size: 18px;
  letter-spacing: .06em; text-align: center; color: var(--text);
}
.empty { padding: 32px; text-align: center; color: var(--muted); }
footer.pagefoot { color: var(--muted); font-size: 12px; text-align: center; padding: 12px 0 30px; }