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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: #f5f7fa;
  color: #333;
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 250px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 30px 20px;
  box-shadow: 2px 0 10px rgba(0,0,0,0.1);
}

.sidebar h2 {
  font-size: 20px;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px solid rgba(255,255,255,0.2);
}

.sidebar ul {
  list-style: none;
}

.sidebar li {
  margin-bottom: 10px;
}

.sidebar a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  display: block;
  padding: 12px 15px;
  border-radius: 8px;
  transition: all 0.2s;
}

.sidebar a:hover {
  background: rgba(255,255,255,0.1);
  color: white;
}

.sidebar a.active {
  background: rgba(255,255,255,0.2);
  color: white;
  font-weight: 600;
}

.content {
  flex: 1;
  padding: 40px;
  overflow-y: auto;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

header h1 {
  font-size: 32px;
  color: #2c3e50;
}

.refresh-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: #666;
}

.refresh-indicator .dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.metric-card {
  background: white;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: transform 0.2s, box-shadow 0.2s;
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.metric-label {
  font-size: 13px;
  color: #666;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.metric-value {
  font-size: 32px;
  font-weight: 700;
  color: #2c3e50;
  margin-bottom: 8px;
}

.metric-change {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 4px;
  display: inline-block;
}

.metric-change.positive {
  background: #d1fae5;
  color: #065f46;
}

.metric-change.negative {
  background: #fee2e2;
  color: #991b1b;
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 24px;
}

.chart-container {
  background: white;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.chart-container h3 {
  margin-bottom: 20px;
  color: #2c3e50;
  font-size: 18px;
}

canvas {
  max-height: 300px;
}

.insights-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.insight-card {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 20px;
  border-radius: 8px;
  border-left: 4px solid #fbbf24;
  animation: fadeIn 0.5s ease;
}

.insight-card h4 {
  font-size: 14px;
  margin-bottom: 8px;
  opacity: 0.9;
}

.insight-card p {
  font-size: 13px;
  line-height: 1.6;
  opacity: 0.95;
}

.loading {
  text-align: center;
  padding: 40px;
  color: #999;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */
@media (max-width: 1200px) {
  .charts-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  body {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    padding: 20px;
  }
  
  .content {
    padding: 20px;
  }
  
  .metrics-grid {
    grid-template-columns: 1fr;
  }
}