:root {
  --brand: #15779b;
  --brand-dark: #11607d;
  --navy: #0d3a52;
  --ice-1: #f4fafd;
  --ice-2: #e3f1f9;
  --ice-3: #d0e7f3;
  --card: #ffffff;
  --text: #16394e;
  --text-dim: #5a7d92;
  --ok: #1a9e77;
  --warn: #e6a23c;
  --alarm: #d9483b;
  --radius: 16px;
  --shadow: 0 2px 10px rgba(13, 58, 82, 0.08), 0 1px 3px rgba(13, 58, 82, 0.06);
}

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

body {
  font-family: 'Poppins', 'Inter', -apple-system, 'Segoe UI', sans-serif;
  background: linear-gradient(165deg, var(--ice-1) 0%, var(--ice-2) 55%, var(--ice-3) 100%);
  background-attachment: fixed;
  color: var(--text);
  min-height: 100vh;
}

/* ---------- Header ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px;
  background: linear-gradient(90deg, var(--brand-dark), var(--brand));
  color: #fff;
  box-shadow: 0 3px 14px rgba(17, 96, 125, 0.35);
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 16px; }

.logo {
  height: 46px;
  background: #fff;
  border-radius: 10px;
  padding: 6px 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.brand-text h1 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.4px;
}

.subtitle { font-size: 0.72rem; opacity: 0.85; letter-spacing: 0.3px; }

.top-status { display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }

.live-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 0.8rem;
  font-weight: 500;
}

.live-pill .dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: #9fe8c8;
  box-shadow: 0 0 8px #9fe8c8;
  animation: pulse 1.8s ease-in-out infinite;
}

.live-pill.offline .dot { background: #ff9d92; box-shadow: 0 0 8px #ff9d92; animation: none; }

@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

.update-time { font-size: 0.7rem; opacity: 0.75; }

/* ---------- Layout ---------- */
.grid {
  max-width: 1320px;
  margin: 0 auto;
  padding: 22px 28px 10px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ---------- Stat cards ---------- */
.cards-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow);
  border-top: 3px solid var(--brand);
}

.stat-icon { font-size: 1.7rem; }

.stat-body { display: flex; flex-direction: column; }

.stat-value { font-size: 1.35rem; font-weight: 600; color: var(--navy); line-height: 1.15; }
.stat-label { font-size: 0.72rem; color: var(--text-dim); letter-spacing: 0.3px; }

.stat-card.alarm-state { border-top-color: var(--alarm); }
.stat-card.warn-state  { border-top-color: var(--warn); }
.stat-card.ok-state    { border-top-color: var(--ok); }

/* ---------- Panels ---------- */
.panel {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 22px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  flex-wrap: wrap;
  gap: 8px;
}

.panel-head h2 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: 0.4px;
  text-transform: uppercase;
}

.panel-hint { font-size: 0.72rem; color: var(--text-dim); }

/* ---------- Sensor tiles ---------- */
.sensor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 14px;
}

.sensor-tile {
  position: relative;
  background: linear-gradient(170deg, #fbfdfe, #eef6fb);
  border: 1px solid var(--ice-3);
  border-radius: 14px;
  padding: 14px 14px 12px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  overflow: hidden;
}

.sensor-tile:hover { transform: translateY(-3px); box-shadow: 0 6px 18px rgba(21, 119, 155, 0.18); }

.sensor-tile::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--tile-color, var(--brand));
}

.sensor-name { font-size: 0.74rem; color: var(--text-dim); letter-spacing: 0.4px; }

.sensor-value {
  font-size: 1.9rem;
  font-weight: 600;
  color: var(--navy);
  margin: 4px 0 2px;
  font-variant-numeric: tabular-nums;
}

.sensor-value .deg { font-size: 1rem; color: var(--text-dim); font-weight: 400; }

.sensor-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.68rem;
  color: var(--text-dim);
}

.trend { font-weight: 600; }
.trend.up { color: var(--alarm); }
.trend.down { color: var(--ok); }

.sensor-badge {
  display: inline-block;
  font-size: 0.62rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  letter-spacing: 0.4px;
}

.badge-ok    { background: rgba(26,158,119,0.12);  color: var(--ok); }
.badge-warn  { background: rgba(230,162,60,0.15);  color: #b07714; }
.badge-alarm { background: rgba(217,72,59,0.13);   color: var(--alarm); }
.badge-off   { background: rgba(90,125,146,0.13);  color: var(--text-dim); }

/* ---------- Chart ---------- */
.range-toggle { display: flex; gap: 0; border: 1px solid var(--ice-3); border-radius: 999px; overflow: hidden; }

.range-toggle button {
  border: none;
  background: transparent;
  padding: 7px 16px;
  font-family: inherit;
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.15s;
}

.range-toggle button.active {
  background: var(--brand);
  color: #fff;
}

.chart-wrap { position: relative; height: 340px; }

.chart-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  background: rgba(255,255,255,0.7);
  border-radius: 10px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.chart-loading.show { opacity: 1; }

/* ---------- Two column ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 20px;
}

@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; }
}

/* ---------- Alarms ---------- */
.alarm-list { display: flex; flex-direction: column; gap: 8px; max-height: 320px; overflow-y: auto; }

.alarm-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--ice-1);
  border-left: 4px solid var(--text-dim);
}

.alarm-item.level-alarm  { border-left-color: var(--alarm); background: rgba(217,72,59,0.06); }
.alarm-item.level-warn   { border-left-color: var(--warn);  background: rgba(230,162,60,0.07); }
.alarm-item.level-info   { border-left-color: var(--brand); background: rgba(21,119,155,0.05); }

.alarm-icon { font-size: 1.1rem; }

.alarm-body { flex: 1; min-width: 0; }
.alarm-title { font-size: 0.8rem; font-weight: 600; color: var(--navy); }
.alarm-sub { font-size: 0.7rem; color: var(--text-dim); }
.alarm-time { font-size: 0.68rem; color: var(--text-dim); white-space: nowrap; }

/* ---------- System ---------- */
.sys-list { display: flex; flex-direction: column; gap: 6px; }

.sys-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--ice-1);
  font-size: 0.78rem;
}

.sys-key { color: var(--text-dim); }
.sys-val { font-weight: 600; color: var(--navy); font-variant-numeric: tabular-nums; }
.sys-val.ok { color: var(--ok); }
.sys-val.bad { color: var(--alarm); }

.sys-links { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

.btn {
  flex: 1;
  text-align: center;
  text-decoration: none;
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--brand-dark);
  background: var(--ice-2);
  border: 1px solid var(--ice-3);
  border-radius: 8px;
  padding: 9px 12px;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn:hover { background: var(--brand); color: #fff; border-color: var(--brand); }

/* ---------- Misc ---------- */
.empty-note {
  color: var(--text-dim);
  font-size: 0.8rem;
  padding: 20px;
  text-align: center;
  grid-column: 1 / -1;
}

.footer {
  text-align: center;
  padding: 14px;
  font-size: 0.7rem;
  color: var(--text-dim);
}

@media (max-width: 640px) {
  .grid { padding: 16px 14px 8px; }
  .topbar { padding: 12px 16px; }
  .brand-text h1 { font-size: 1rem; }
  .chart-wrap { height: 260px; }
}