:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1c2330;
  --muted: #5d6778;
  --border: #dde1e8;
  --accent: #1f6feb;
  --accent-text: #ffffff;
  --danger: #c62828;
  --ok-bg: #e6f4ea;
  --ok-text: #1e6b34;
  --err-bg: #fdecea;
  --err-text: #8c1d18;
  --off: #8a93a3;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1419;
    --card: #182029;
    --text: #e6e9ee;
    --muted: #9aa4b2;
    --border: #2a3440;
    --accent: #4c8dff;
    --danger: #ef5350;
    --ok-bg: #13301d;
    --ok-text: #8fd6a5;
    --err-bg: #3a1614;
    --err-text: #f4a9a3;
    --off: #6b7584;
  }
}

* { 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;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; }

main { max-width: 1100px; margin: 0 auto; padding: 16px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
}
.card.narrow { max-width: 460px; margin: 32px auto; }

h1 { font-size: 1.35rem; margin: 0 0 12px; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }

label { display: block; margin: 0 0 12px; font-weight: 600; }
input:not([type=checkbox]) {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 10px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}

button, .button {
  display: inline-block;
  padding: 10px 16px;
  font: inherit;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
}
.button.secondary { background: var(--muted); }
button.danger { background: var(--danger); padding: 6px 12px; }
button.link { background: none; color: var(--accent); padding: 0; }

.muted { color: var(--muted); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; }
.wrap { word-break: break-all; white-space: pre-wrap; }
pre { background: var(--bg); padding: 12px; border-radius: 6px; overflow-x: auto; }

.flash { padding: 10px 12px; border-radius: 6px; }
.flash-ok { background: var(--ok-bg); color: var(--ok-text); }
.flash-error { background: var(--err-bg); color: var(--err-text); }

.badge { padding: 2px 8px; border-radius: 999px; font-size: .8rem; font-weight: 700; }
.badge.on { background: var(--ok-bg); color: var(--ok-text); }
.badge.off { background: var(--bg); color: var(--off); border: 1px solid var(--border); }

dl.grid { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0; }
dt { color: var(--muted); }
dd { margin: 0; min-width: 0; }

table { width: 100%; border-collapse: collapse; margin-bottom: 12px; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid var(--border); vertical-align: middle; }
th { color: var(--muted); font-weight: 600; font-size: .85rem; }

form.inline { display: flex; gap: 8px; align-items: center; justify-content: flex-end; margin: 0; }
label.check { display: inline-flex; gap: 4px; align-items: center; margin: 0; font-weight: 400; font-size: .85rem; }

form.add { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
form.add label { flex: 1 1 220px; margin: 0; }

.qr { max-width: 280px; margin: 12px auto; background: #fff; padding: 8px; border-radius: 8px; }
.qr svg { display: block; width: 100%; height: auto; }

@media (max-width: 720px) {
  dl.grid { grid-template-columns: 1fr; }
  thead { display: none; }
  table, tbody, tr, td { display: block; width: 100%; }
  tr { border-bottom: 1px solid var(--border); padding: 8px 0; }
  td { border: 0; padding: 4px 0; }
  td[data-label]:not([data-label=""])::before {
    content: attr(data-label) ": ";
    color: var(--muted);
    font-size: .85rem;
  }
  form.inline { justify-content: flex-start; }
}