:root {
  --bg-color: #f3f4f6;
  --card-bg: #ffffff;
  --text-main: #1f2937;
  --text-muted: #6b7280;
  --primary-blue: #3b82f6;
  --primary-green: #10b981;
  --border-color: #e5e7eb;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  padding: 2rem 1rem;
}

.container {
  max-width: 900px;
  margin: 0 auto;
}

.card {
  background-color: var(--card-bg);
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  overflow: hidden;
  margin-bottom: 2rem;
}

.card-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.card-subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.meta-info {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--primary-green);
  display: inline-block;
}

.external-link {
  color: var(--primary-blue);
  text-decoration: none;
}

.external-link:hover {
  text-decoration: underline;
}

/* Controls */
.controls-section {
  padding: 1.5rem 1.5rem 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.filter-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.toggle-group {
  display: flex;
  gap: 0.5rem;
  background-color: var(--bg-color);
  padding: 0.25rem;
  border-radius: 8px;
}

.toggle-btn {
  background: transparent;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.toggle-btn.active[data-type="waterDepth"] {
  background-color: var(--card-bg);
  color: var(--primary-blue);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.toggle-btn.active[data-type="batteryVoltage"] {
  background-color: var(--card-bg);
  color: var(--primary-green);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.select-control {
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--card-bg);
  font-size: 0.875rem;
  color: var(--text-main);
  outline: none;
}

/* 3D Container */
#three-container {
  width: 100%;
  height: 400px;
  background: linear-gradient(180deg, #f0fdfa 0%, #e0f2fe 100%);
  border-bottom: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

/* Chart */
.chart-container {
  padding: 1.5rem;
  position: relative;
  height: 350px;
  width: 100%;
}

/* Table */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th,
td {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: #f9fafb;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

tbody tr:nth-child(even) {
  background-color: #f9fafb;
}

.badge {
  display: inline-block;
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  font-size: 0.7rem;
  background-color: #e0e7ff;
  color: #4338ca;
  margin-left: 0.5rem;
}

/* Footer */
.card-footer {
  padding: 1.5rem;
  background-color: #f9fafb;
  border-top: 1px solid var(--border-color);
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Loading/Empty State */
.overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10;
  backdrop-filter: blur(2px);
}

.loader {
  border: 3px solid #f3f3f3;
  border-top: 3px solid var(--primary-blue);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  animation: spin 1s linear infinite;
  margin-right: 10px;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

.error-msg {
  color: #ef4444;
  text-align: center;
  padding: 2rem;
}

@media (max-width: 640px) {
  .chart-container {
    height: 250px;
  }
}