:root {
  --bg: #f6f7f5; --card: #fff; --fg: #1b1d1a; --muted: #6b7168;
  --line: #dfe2dc; --accent: #2f7d4f; --warn: #b4531f; --bad: #a8322b;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a; --card: #1c1f24; --fg: #e8eae6; --muted: #9aa093;
    --line: #2b2f36; --accent: #5fbf86; --warn: #e08b4e; --bad: #e0685f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; padding: 0 1rem 3rem; background: var(--bg); color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
header {
  display: flex; flex-wrap: wrap; gap: .75rem; align-items: baseline;
  justify-content: space-between; padding: 1rem 0; border-bottom: 1px solid var(--line);
  margin-bottom: 1.25rem;
}
h1 { font-size: 1.25rem; margin: 0; }
h2 { font-size: 1rem; margin: 2rem 0 .75rem; }
h3 { font-size: 1rem; margin: 0; }
main { max-width: 980px; margin: 0 auto; }
.muted { color: var(--muted); }
.small { font-size: .85em; }
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1rem;
}
.card header { border: 0; margin: 0 0 .5rem; padding: 0; }
.pill {
  display: inline-block; padding: .1rem .5rem; border-radius: 999px;
  border: 1px solid var(--line); font-size: .8rem;
}
.pill.on { color: var(--accent); border-color: currentColor; }
.pill.off { color: var(--bad); border-color: currentColor; }
.readings { display: flex; gap: 1.25rem; margin: .75rem 0; flex-wrap: wrap; }
.readings div { min-width: 5rem; }
.readings b { display: block; font-size: 1.35rem; font-weight: 600; }
.actions { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
button {
  font: inherit; padding: .4rem .8rem; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--line); background: var(--card); color: var(--fg);
}
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button:disabled { opacity: .5; cursor: not-allowed; }
input, select {
  font: inherit; padding: .35rem .5rem; border-radius: 8px;
  border: 1px solid var(--line); background: var(--card); color: var(--fg);
}
input[type=number] { width: 8.5rem; }
form { display: flex; flex-wrap: wrap; gap: .5rem; margin: .75rem 0; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
td, th { text-align: left; padding: .4rem .5rem; border-bottom: 1px solid var(--line); }
.log { list-style: none; padding: 0; margin: 0; font-size: .9rem; }
.log li { padding: .35rem 0; border-bottom: 1px solid var(--line); display: flex; gap: .6rem; }
.log time { color: var(--muted); flex: 0 0 8.5rem; }
.log .bad { color: var(--bad); }
.log .warn { color: var(--warn); }
.spark { width: 100%; height: 48px; display: block; }
.toast {
  position: fixed; left: 50%; bottom: 1.5rem; transform: translateX(-50%);
  background: var(--card); border: 1px solid var(--line); border-radius: 8px;
  padding: .6rem 1rem; box-shadow: 0 4px 20px rgb(0 0 0 / .18); max-width: 90vw;
}
.toast.bad { border-color: var(--bad); color: var(--bad); }