:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #222536;
  --border: #2e3248;
  --accent: #4f8ef7;
  --accent2: #6ee7b7;
  --danger: #f87171;
  --warn: #fbbf24;
  --text: #e2e8f0;
  --muted: #64748b;
  --radius: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── NAV ─────────────────────────────────────── */
nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
nav .logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
}
nav .logo span { color: var(--text); }
nav .nav-links { display: flex; gap: 8px; margin-left: auto; }
nav .nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: .9rem;
  padding: 6px 14px;
  border-radius: 6px;
  transition: background .15s, color .15s;
}
nav .nav-links a:hover, nav .nav-links a.active {
  background: var(--surface2);
  color: var(--text);
}

/* ── LAYOUT ───────────────────────────────────── */
.container { max-width: 1300px; margin: 0 auto; padding: 28px 24px; }

h1 { font-size: 1.4rem; font-weight: 600; }
h2 { font-size: 1.1rem; font-weight: 600; }

/* ── STATS ROW ────────────────────────────────── */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.stat-card .label { font-size: .78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.stat-card .value { font-size: 2rem; font-weight: 700; margin-top: 6px; }
.stat-card .value.ok   { color: var(--accent2); }
.stat-card .value.warn { color: var(--warn); }
.stat-card .value.err  { color: var(--danger); }

/* ── TOOLBAR ──────────────────────────────────── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.toolbar input[type=search] {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 8px 14px;
  font-size: .9rem;
  width: 240px;
  outline: none;
}
.toolbar input[type=search]:focus { border-color: var(--accent); }
.toolbar .spacer { flex: 1; }

/* ── BUTTONS ──────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 8px;
  font-size: .88rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: opacity .15s;
  text-decoration: none;
}
.btn:hover { opacity: .85; }
.btn-primary   { background: var(--accent);  color: #fff; }
.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-danger    { background: var(--danger);  color: #fff; }
.btn-sm { padding: 5px 12px; font-size: .82rem; }

/* ── DEVICE GRID ──────────────────────────────── */
.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 18px;
}

.device-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: border-color .15s, box-shadow .15s;
  text-decoration: none;
  color: inherit;
  display: block;
}
.device-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.device-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.device-status {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.device-status.online  { background: var(--accent2); box-shadow: 0 0 6px var(--accent2); }
.device-status.offline { background: var(--muted); }

.device-name { font-weight: 600; font-size: 1rem; }
.device-imei { font-size: .75rem; color: var(--muted); margin-top: 1px; }
.device-location { font-size: .78rem; color: var(--muted); margin-left: auto; text-align: right; }

.device-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.metric {
  background: var(--surface2);
  border-radius: 8px;
  padding: 12px;
}
.metric .metric-label { font-size: .7rem; color: var(--muted); text-transform: uppercase; }
.metric .metric-value { font-size: 1.3rem; font-weight: 600; margin-top: 4px; }
.metric .metric-value.temp { color: #f97316; }
.metric .metric-value.hum  { color: var(--accent); }
.metric .metric-value.bat  { color: var(--accent2); }
.metric .metric-value.sig  { color: var(--warn); }

.device-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 14px;
  font-size: .75rem;
  color: var(--muted);
}
.alarm-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: .7rem;
  font-weight: 600;
}
.alarm-badge.Interval              { background: #1e3a5f; color: var(--accent); }
.alarm-badge.LowBattery            { background: #3b2000; color: var(--warn); }
.alarm-badge.TempHumOutOfRange     { background: #3b1515; color: var(--danger); }
.alarm-badge.SensorAnomaly         { background: #3b1515; color: var(--danger); }
.alarm-badge.ExternalPowerDisconnect { background: #3b2000; color: var(--warn); }

/* ── LOCATION GROUPS ─────────────────────────── */
.location-group { margin-bottom: 28px; }
.location-group-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.location-group-header h2 { font-size: 1rem; font-weight: 600; }
.location-group-header .count {
  font-size: .75rem;
  color: var(--muted);
  background: var(--surface2);
  border-radius: 12px;
  padding: 2px 10px;
}
.location-group-header .status-summary {
  margin-left: auto;
  font-size: .78rem;
  color: var(--muted);
  display: flex;
  gap: 12px;
}
.location-group-header .status-summary .online-count { color: var(--accent2); }
.location-group-header .status-summary .offline-count { color: var(--muted); }

/* ── DEVICE CARD ACTIONS ─────────────────────── */
.device-card-actions {
  display: flex;
  gap: 6px;
  padding: 0 16px 12px;
  justify-content: flex-end;
}

/* ── EMPTY STATE ──────────────────────────────── */
.empty {
  text-align: center;
  padding: 80px 20px;
  color: var(--muted);
}
.empty svg { width: 56px; height: 56px; margin-bottom: 16px; opacity: .4; }
.empty p { font-size: 1rem; }

/* ── ALERTS LIST ──────────────────────────────── */
.alerts-list { display: flex; flex-direction: column; gap: 10px; }
.alert-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
}
.alert-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--danger); flex-shrink: 0; }
.alert-info { flex: 1; }
.alert-info .alert-type { font-weight: 600; font-size: .9rem; color: var(--danger); }
.alert-info .alert-meta { font-size: .78rem; color: var(--muted); margin-top: 2px; }

/* ── DETAIL PAGE ──────────────────────────────── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  text-decoration: none;
  font-size: .9rem;
  margin-bottom: 20px;
}
.back-link:hover { color: var(--text); }

.detail-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.detail-header h1 { flex: 1; }
.detail-header .badge-imei {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: .78rem;
  color: var(--muted);
  font-family: monospace;
}

.metrics-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}
.metric-big {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.metric-big .label { font-size: .75rem; color: var(--muted); text-transform: uppercase; }
.metric-big .val   { font-size: 2rem; font-weight: 700; margin-top: 6px; }

.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
}
.chart-card h2 { margin-bottom: 16px; }
.chart-wrap { position: relative; height: 260px; }

.range-picker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.range-picker label { font-size: .85rem; color: var(--muted); }
.range-picker input[type=datetime-local] {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 6px 10px;
  font-size: .85rem;
  outline: none;
}
.range-picker input:focus { border-color: var(--accent); }

/* ── READINGS TABLE ───────────────────────────── */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}
thead th {
  text-align: left;
  padding: 10px 14px;
  font-size: .75rem;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}
tbody tr { border-bottom: 1px solid var(--border); }
tbody tr:hover { background: var(--surface2); }
tbody td { padding: 10px 14px; }

/* ── MAP PICKER ──────────────────────────────── */
.map-picker-wrap {
  position: relative;
  margin-bottom: 16px;
}
.map-picker-wrap .map-search {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 8px 12px;
  font-size: .85rem;
  outline: none;
  margin-bottom: 6px;
}
.map-picker-wrap .map-search:focus { border-color: var(--accent); }
.map-picker-wrap .map-search-results {
  position: absolute;
  top: 40px;
  left: 0; right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  z-index: 500;
  max-height: 200px;
  overflow-y: auto;
}
.map-picker-wrap .map-search-results:empty { display: none; }
.map-search-item {
  padding: 8px 12px;
  font-size: .82rem;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
}
.map-search-item:last-child { border-bottom: none; }
.map-search-item:hover { background: var(--surface2); }
.map-picker-container {
  height: 250px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

/* ── MODAL ────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  display: none;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  width: 100%;
  max-width: 560px;
  box-shadow: var(--shadow);
}
.modal h2 { margin-bottom: 20px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: .82rem; color: var(--muted); margin-bottom: 6px; }
.form-group input[type=text],
.form-group input[type=number] {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 8px 12px;
  font-size: .9rem;
  outline: none;
}
.form-group input:focus { border-color: var(--accent); }
.modal-footer { display: flex; gap: 10px; justify-content: flex-end; margin-top: 22px; }

/* ── SPINNER ──────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 36px; height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-state { text-align: center; padding: 60px; color: var(--muted); }

/* ── TOAST ────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: 28px; right: 28px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 20px;
  font-size: .88rem;
  box-shadow: var(--shadow);
  transform: translateY(80px);
  opacity: 0;
  transition: transform .25s, opacity .25s;
  z-index: 300;
}
#toast.show { transform: translateY(0); opacity: 1; }
#toast.success { border-color: var(--accent2); color: var(--accent2); }
#toast.error   { border-color: var(--danger);  color: var(--danger); }