:root {
  --bg: #0f1720;
  --panel: #16212e;
  --panel-2: #1c2a3a;
  --border: #263647;
  --text: #e6edf3;
  --muted: #8aa0b3;
  --primary: #2f9e6f;
  --primary-hover: #37b37e;
  --danger: #e5484d;
  --warn: #e3a008;
  --temp: #ff8a5b;
  --hum: #4aa8ff;
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
h1, h2 { margin: 0 0 .4rem; }
h2 { font-size: 1.05rem; }
.muted { color: var(--muted); font-weight: 400; }
.hidden { display: none !important; }

.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  padding: .5rem .85rem; border-radius: 8px; cursor: pointer; text-decoration: none;
  font-size: .9rem;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-hover); }
.btn.ghost { background: transparent; }
.btn.armed { background: var(--primary); border-color: var(--primary); color:#fff; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

/* Login */
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 1rem; }
.login-card { width: 100%; max-width: 340px; display: flex; flex-direction: column; gap: .7rem; }
.login-card h1 { margin: 0; }
.login-card label { display: flex; flex-direction: column; gap: .3rem; font-size: .85rem; color: var(--muted); }
.login-card input { padding: .6rem .7rem; border-radius: 8px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); }
.alert { padding: .55rem .7rem; border-radius: 8px; font-size: .88rem; }
.alert.error { background: rgba(229,72,77,.15); border: 1px solid var(--danger); color: #ffb4b6; }

/* Topbar */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: .8rem 1.2rem; border-bottom: 1px solid var(--border); background: var(--panel);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: .5rem; }
.pill { font-size: .8rem; padding: .3rem .6rem; border-radius: 999px; border: 1px solid var(--border); color: var(--muted); }
.pill.online { color: #7ee2b8; border-color: var(--primary); background: rgba(47,158,111,.12); }
.pill.offline { color: #ffb4b6; border-color: var(--danger); background: rgba(229,72,77,.12); }

.alarm-banner {
  background: var(--danger); color: #fff; padding: .7rem 1.2rem; font-weight: 600;
  display: flex; gap: .5rem; align-items: center; animation: pulse 1s infinite;
}
@keyframes pulse { 50% { opacity: .78; } }

.container { max-width: 1100px; margin: 0 auto; padding: 1.2rem; display: flex; flex-direction: column; gap: 1.2rem; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; }
.stat { display: flex; flex-direction: column; gap: .3rem; }
.stat-label { color: var(--muted); font-size: .8rem; text-transform: uppercase; letter-spacing: .04em; }
.stat-value { font-size: 2rem; font-weight: 700; }
.stat-value.small { font-size: 1.05rem; font-weight: 600; }
.stat-value .unit { font-size: 1rem; color: var(--muted); margin-left: .15rem; }
.stat-sub { font-size: .8rem; font-weight: 600; }
.stat-sub.good { color: #7ee2b8; }
.stat-sub.ok { color: var(--warn); }
.stat-sub.weak { color: var(--danger); }

.chart-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: .6rem; }
.range-buttons button {
  background: var(--panel-2); color: var(--muted); border: 1px solid var(--border);
  padding: .3rem .6rem; border-radius: 6px; cursor: pointer; font-size: .82rem;
}
.range-buttons button.active { color: #fff; border-color: var(--primary); background: rgba(47,158,111,.2); }
.chart-box { position: relative; height: 240px; margin-bottom: .6rem; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
@media (max-width: 820px) { .grid-2 { grid-template-columns: 1fr; } }

.settings-form { display: flex; flex-direction: column; gap: .7rem; }
.settings-form label { display: flex; flex-direction: column; gap: .3rem; font-size: .8rem; color: var(--muted); }
.settings-form input { padding: .5rem .6rem; border-radius: 8px; border: 1px solid var(--border); background: var(--panel-2); color: var(--text); }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: .7rem; }
.form-actions { display: flex; align-items: center; gap: .8rem; }

.events { display: flex; flex-direction: column; gap: .3rem; max-height: 320px; overflow-y: auto; font-size: .85rem; }
.event { display: grid; grid-template-columns: auto auto 1fr; gap: .6rem; padding: .35rem .5rem; border-radius: 6px; background: var(--panel-2); align-items: baseline; }
.event time { color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.event .lvl { font-size: .7rem; text-transform: uppercase; font-weight: 700; letter-spacing: .03em; }
.event.error .lvl { color: var(--danger); }
.event.warning .lvl { color: var(--warn); }
.event.info .lvl { color: var(--muted); }
.event .msg { word-break: break-word; }