:root {
  /* Light Theme */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --accent-primary: #3b82f6;
  --accent-secondary: #10b981;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;
  --border-color: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Status Colors */
  --status-good: #10b981;
  --status-warning: #f59e0b;
  --status-danger: #ef4444;
  --status-unknown: #94a3b8;
}

.dark-mode {
  /* Dark Theme */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --accent-primary: #60a5fa;
  --accent-secondary: #34d399;
  --accent-warning: #fbbf24;
  --accent-danger: #f87171;
  --border-color: #334155;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

/* NAVBAR */
.navbar {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 0;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.logo i {
  font-size: 1.75rem;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--text-muted);
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: var(--accent-primary);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.slider.round {
  border-radius: 24px;
}

.slider.round:before {
  border-radius: 50%;
}

.last-update {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* CONTAINER */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* HEADER */
.header {
  text-align: center;
  margin-bottom: 2rem;
}

.header h1 {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header p {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

/* CARDS */
.card {
  background-color: var(--bg-card);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h2 {
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-header h2 i {
  color: var(--accent-primary);
}

/* GRID TOP */
.grid-top {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.sensor-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.status-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--status-unknown);
}

.gauge-container, .temperature-container, .vibration-container {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-grow: 1;
}

.temperature-container, .vibration-container {
  gap: 1rem;
}

.temperature-icon, .vibration-icon {
  font-size: 3rem;
  color: var(--accent-primary);
}

.value-container {
  text-align: center;
}

.value {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.value-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.card-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

.sensor-info {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.info-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.info-item span:first-child {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.info-item span:last-child {
  font-size: 0.875rem;
  font-weight: 500;
}

/* CHART CARD */
.chart-card {
  margin-bottom: 1.5rem;
}

.vibration-info {
  display: flex;
  gap: 1.5rem;
  font-size: 0.875rem;
}

.vibration-threshold {
  color: var(--accent-warning);
  font-weight: 500;
}

.last-detection {
  color: var(--text-secondary);
}

.chart-container {
  padding: 1.5rem;
  height: 300px;
}

/* HISTORY CARD */
.history-card {
  margin-bottom: 1.5rem;
}

.table-container {
  padding: 0 1.5rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td {
  font-size: 0.875rem;
}

.status-badge {
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.status-good {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--status-good);
}

.status-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--status-warning);
}

.status-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--status-danger);
}

.status-unknown {
  background-color: rgba(148, 163, 184, 0.1);
  color: var(--status-unknown);
}

.table-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: center;
}

.pagination {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-pagination {
  padding: 0.5rem 1rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.btn-pagination:hover:not(:disabled) {
  background-color: var(--border-color);
}

.btn-pagination:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.page-info {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* BUTTONS */
.btn-primary {
  padding: 0.5rem 1rem;
  background-color: var(--accent-primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.btn-primary:hover {
  background-color: var(--accent-primary);
  filter: brightness(1.1);
  transform: translateY(-2px);
}

/* LOADING OVERLAY */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  color: white;
  display: none;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 5px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s ease-in-out infinite;
  margin-bottom: 1rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }
  
  .grid-top {
    grid-template-columns: 1fr;
  }
  
  .card-header {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
  
  .vibration-info {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .header h1 {
    font-size: 1.75rem;
  }
  
  .value {
    font-size: 2rem;
  }
  
  .table-container {
    padding: 0 0.5rem;
  }
  
  th, td {
    padding: 0.5rem 0.25rem;
  }
  
  .pagination {
    flex-direction: column;
    gap: 0.5rem;
  }
}