/* ---------- Theme tokens ---------- */
:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e3e8ef;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --primary-contrast: #ffffff;
  --ok: #16a34a;
  --ok-bg: #dcfce7;
  --warn: #d97706;
  --warn-bg: #fef3c7;
  --bad: #dc2626;
  --bad-bg: #fee2e2;
  --idle: #64748b;
  --idle-bg: #e2e8f0;
  --info: #0891b2;
  --info-bg: #cffafe;
  --shadow: 0 1px 2px rgba(15, 23, 42, .05), 0 1px 3px rgba(15, 23, 42, .06);
  --radius: 12px;
  --chart-temp: #ef4444;
  --chart-temp2: #f97316;
  --chart-hum: #0ea5e9;
  --chart-bat: #22c55e;
  --chart-light: #eab308;
  --chart-vib: #8b5cf6;
  --chart-grid: rgba(100, 116, 139, .15);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b1120;
    --surface: #111827;
    --surface-2: #0f172a;
    --border: #1f2937;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --primary: #3b82f6;
    --ok: #4ade80;
    --ok-bg: rgba(34, 197, 94, .15);
    --warn: #fbbf24;
    --warn-bg: rgba(245, 158, 11, .15);
    --bad: #f87171;
    --bad-bg: rgba(239, 68, 68, .15);
    --idle: #94a3b8;
    --idle-bg: rgba(148, 163, 184, .15);
    --info: #22d3ee;
    --info-bg: rgba(34, 211, 238, .15);
    --shadow: 0 1px 2px rgba(0, 0, 0, .3);
    --chart-grid: rgba(148, 163, 184, .12);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0b1120;
  --surface: #111827;
  --surface-2: #0f172a;
  --border: #1f2937;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #3b82f6;
  --ok: #4ade80;
  --ok-bg: rgba(34, 197, 94, .15);
  --warn: #fbbf24;
  --warn-bg: rgba(245, 158, 11, .15);
  --bad: #f87171;
  --bad-bg: rgba(239, 68, 68, .15);
  --idle: #94a3b8;
  --idle-bg: rgba(148, 163, 184, .15);
  --info: #22d3ee;
  --info-bg: rgba(34, 211, 238, .15);
  --shadow: 0 1px 2px rgba(0, 0, 0, .3);
  --chart-grid: rgba(148, 163, 184, .12);
  color-scheme: dark;
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { margin: 0 0 .5rem; line-height: 1.25; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.1rem; }
h3 { font-size: 1rem; }
code { background: var(--surface-2); border: 1px solid var(--border); padding: 0 .3em; border-radius: 4px; font-size: .9em; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.nowrap { white-space: nowrap; }
.num { font-variant-numeric: tabular-nums; }
.hidden { display: none !important; }

.container { max-width: 1400px; margin: 0 auto; padding: 20px 16px 48px; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 1000;
  display: flex; align-items: center; gap: 20px;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 8px; color: var(--text); font-weight: 650; font-size: 1.05rem; }
.brand:hover { text-decoration: none; }
.brand svg { color: var(--primary); }
.nav { display: flex; gap: 4px; }
.nav a { color: var(--muted); padding: 6px 10px; border-radius: 8px; font-weight: 500; }
.nav a:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
.nav a.active { color: var(--text); background: var(--surface-2); }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.user-chip { color: var(--muted); font-size: .9rem; }
@media (max-width: 640px) {
  .user-chip, .nav { display: none; }
}

/* ---------- Buttons & forms ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 14px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-weight: 550;
  cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { background: var(--surface-2); text-decoration: none; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-contrast); }
.btn-primary:hover { filter: brightness(1.08); background: var(--primary); }
.btn-ghost { background: transparent; }
.btn-sm { padding: 5px 10px; font-size: .85rem; }
.btn-block { width: 100%; }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--muted); cursor: pointer;
}
.icon-btn:hover { color: var(--text); background: var(--surface-2); }

input, select {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px;
  width: 100%;
}
input:focus, select:focus { outline: 2px solid color-mix(in srgb, var(--primary) 40%, transparent); border-color: var(--primary); }
label { display: block; margin-bottom: 14px; font-weight: 550; }
label input, label select { margin-top: 6px; font-weight: 400; }

.alert { padding: 10px 12px; border-radius: 8px; margin-bottom: 14px; border: 1px solid transparent; }
.alert-error { background: var(--bad-bg); color: var(--bad); border-color: color-mix(in srgb, var(--bad) 30%, transparent); }
.alert-warn { background: var(--warn-bg); color: var(--warn); border-color: color-mix(in srgb, var(--warn) 30%, transparent); }
.alert-info { background: var(--info-bg); color: var(--info); border-color: color-mix(in srgb, var(--info) 30%, transparent); }

/* ---------- Cards ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px;
}
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.card-head h2 { margin: 0; }
.auth-card { max-width: 400px; margin: 8vh auto 0; padding: 28px; }

.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.page-head h1 { margin: 0; }
.page-head .actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

/* ---------- Stat tiles ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 14px 16px; cursor: pointer; text-align: left;
  font: inherit; color: inherit; width: 100%;
}
.stat:hover { border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.stat.selected { outline: 2px solid var(--primary); outline-offset: -1px; }
.stat .label { color: var(--muted); font-size: .85rem; display: flex; align-items: center; gap: 6px; }
.stat .value { font-size: 1.8rem; font-weight: 700; font-variant-numeric: tabular-nums; margin-top: 2px; }
.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; background: var(--idle); flex: none; }
.dot.ok { background: var(--ok); }
.dot.warn { background: var(--warn); }
.dot.bad { background: var(--bad); }
.dot.info { background: var(--info); }

/* ---------- Layout grids ---------- */
.grid-2 { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 16px; }
@media (max-width: 1280px) { .grid-2 { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Table ---------- */
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.toolbar input[type="search"] { max-width: 260px; }
.toolbar select { width: auto; }
.table-wrap { overflow-x: auto; margin: 0 -16px -16px; border-top: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: middle; }
th { font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); font-weight: 600; background: var(--surface-2); white-space: nowrap; }
th.sortable { cursor: pointer; user-select: none; }
th.sortable:hover { color: var(--text); }
th .arrow { opacity: .6; margin-left: 2px; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr.clickable { cursor: pointer; }
tbody tr.clickable:hover { background: var(--surface-2); }
td.right, th.right { text-align: right; }
.device-name { font-weight: 600; color: var(--text); }
.device-sub { color: var(--muted); font-size: .8rem; }
.empty { text-align: center; color: var(--muted); padding: 32px 12px; }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 2px 8px; border-radius: 999px; font-size: .78rem; font-weight: 600; white-space: nowrap;
  background: var(--idle-bg); color: var(--idle);
}
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.bad { background: var(--bad-bg); color: var(--bad); }
.badge.info { background: var(--info-bg); color: var(--info); }

.battery { display: inline-flex; align-items: center; gap: 6px; }
.battery .bar { width: 26px; height: 10px; border: 1.5px solid currentColor; border-radius: 2px; position: relative; color: var(--muted); }
.battery .bar::after { content: ""; position: absolute; right: -4px; top: 2px; width: 2px; height: 4px; background: currentColor; border-radius: 0 1px 1px 0; }
.battery .fill { position: absolute; inset: 1px auto 1px 1px; background: var(--ok); border-radius: 1px; }
.battery.low .fill { background: var(--bad); }
.battery.mid .fill { background: var(--warn); }

/* ---------- Map ---------- */
.map { height: 420px; border-radius: 10px; overflow: hidden; border: 1px solid var(--border); background: var(--surface-2); }
.map.tall { height: 480px; }
@media (max-width: 640px) { .map, .map.tall { height: 320px; } }
.leaflet-popup-content { font: 13px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.pin { width: 16px; height: 16px; border-radius: 50%; border: 2.5px solid #fff; box-shadow: 0 0 0 1px rgba(0,0,0,.25), 0 1px 4px rgba(0,0,0,.35); background: #64748b; }
.pin.ok { background: #16a34a; }
.pin.warn { background: #d97706; }
.pin.bad { background: #dc2626; }
.pin.info { background: #0891b2; }

/* ---------- Device page ---------- */
.back { display: inline-flex; align-items: center; gap: 4px; color: var(--muted); margin-bottom: 8px; }
.meta { display: flex; flex-wrap: wrap; gap: 6px 18px; color: var(--muted); font-size: .9rem; margin-top: 6px; }
.readings { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-bottom: 16px; }
.reading { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; box-shadow: var(--shadow); }
.reading .label { color: var(--muted); font-size: .82rem; }
.reading .value { font-size: 1.5rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.reading .value small { font-size: .9rem; color: var(--muted); font-weight: 500; margin-left: 2px; }
.reading.alarm { border-color: var(--bad); }
.reading.alarm .value { color: var(--bad); }

.range-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg button { border: 0; background: var(--surface); color: var(--muted); padding: 6px 12px; font: inherit; font-weight: 550; cursor: pointer; border-right: 1px solid var(--border); }
.seg button:last-child { border-right: 0; }
.seg button:hover { color: var(--text); background: var(--surface-2); }
.seg button.active { background: var(--primary); color: var(--primary-contrast); }
.custom-range { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.custom-range input { width: auto; padding: 5px 8px; }

.charts { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; margin-bottom: 16px; }
@media (max-width: 1000px) { .charts { grid-template-columns: minmax(0, 1fr); } }
.chart-box { position: relative; height: 260px; }
.chart-card.wide { grid-column: 1 / -1; }
.progress { height: 3px; background: var(--border); border-radius: 3px; overflow: hidden; margin: 6px 0 0; }
.progress > div { height: 100%; width: 0; background: var(--primary); transition: width .2s; }
.summary-table td { padding: 6px 10px; }
.rules { display: grid; gap: 10px; }
.rule { border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; background: var(--surface-2); }
.rule dl { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 0; font-size: .9rem; }
.rule dt { color: var(--muted); }
.rule dd { margin: 0; }

.spinner { width: 16px; height: 16px; border: 2px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; display: inline-block; vertical-align: middle; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-row { display: flex; align-items: center; gap: 8px; color: var(--muted); padding: 24px; justify-content: center; }
.updated { color: var(--muted); font-size: .85rem; }
.mt { margin-top: 16px; }