:root {
  --bg-1: #04131f;
  --bg-2: #0b2a2d;
  --card: rgba(7, 25, 37, 0.82);
  --line: #67e8f9;
  --grid: rgba(158, 185, 201, 0.16);
  --text: #e5f4ff;
  --muted: #9fb6c7;
  --accent: #22c55e;
  --alert: #ef4444;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 15%, #113f67 0%, rgba(17, 63, 103, 0) 38%),
    radial-gradient(circle at 85% 80%, #0f766e 0%, rgba(15, 118, 110, 0) 34%),
    linear-gradient(160deg, var(--bg-1), var(--bg-2));
  min-height: 100vh;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.top-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.top-bar h1 {
  margin: 0;
  font-size: clamp(1.4rem, 2.5vw, 2rem);
}

.tank-label {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.controls label {
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

input,
select,
button {
  font: inherit;
  background: rgba(6, 22, 32, 0.9);
  color: var(--text);
  border: 1px solid rgba(159, 182, 199, 0.35);
  border-radius: 10px;
  padding: 8px 10px;
}

button {
  cursor: pointer;
  background: rgba(6, 50, 44, 0.9);
  border-color: rgba(52, 211, 153, 0.5);
}

.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.device-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.device-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--muted);
  padding-left: 2px;
}

.device-canvas {
  width: 100%;
  height: auto;
  display: block;
  background: var(--card);
  border: 1px solid rgba(159, 182, 199, 0.3);
  border-radius: 16px;
  backdrop-filter: blur(4px);
}

.device-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.stat-card {
  background: var(--card);
  border: 1px solid rgba(159, 182, 199, 0.3);
  border-radius: 10px;
  backdrop-filter: blur(4px);
  padding: 5px 8px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition: border-color 0.3s, background 0.3s;
}

.stat-card.temp-alert {
  border-color: rgba(239, 68, 68, 0.7);
  background: rgba(80, 10, 10, 0.7);
}

.stat-label {
  color: var(--muted);
  font-size: 0.7rem;
  margin: 0 0 2px;
}

.stat-value {
  margin: 0;
  font-weight: 700;
  font-size: clamp(0.9rem, 1.5vw, 1.2rem);
  line-height: 1;
}

.stat-value.small {
  font-size: clamp(0.8rem, 1.3vw, 1.05rem);
}

.stat-meta {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.65rem;
}

.status-line {
  margin: 10px 2px 8px;
  color: var(--muted);
  font-size: 0.9rem;
}

.stale-alert {
  margin: 0;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--alert);
  color: #fff;
  font-weight: 700;
  text-align: center;
}

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