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

body {
  font-family: "Inter", sans-serif;
  background: linear-gradient(135deg, #f8fafc 0%, #e0f2fe 100%);
  min-height: 100vh;
  color: #1f2937;
}

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

/* Header */
.header {
  background: white;
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  border: 1px solid #f3f4f6;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
  padding: 12px;
  border-radius: 12px;
  box-shadow: 0 8px 25px -8px rgba(59, 130, 246, 0.5);
}

.logo-icon i {
  color: white;
  font-size: 24px;
}

.title {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, #1f2937 0%, #6b7280 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: #6b7280;
  font-weight: 500;
}

.period-info {
  text-align: right;
}

.period-label {
  font-size: 0.875rem;
  color: #9ca3af;
}

.period-value {
  font-weight: 600;
  color: #1f2937;
}

/* Stats Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.stat-card {
  background: white;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  border: 1px solid #f3f4f6;
  transition: all 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.1);
}

.stat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.stat-icon {
  background: linear-gradient(135deg, #dbeafe 0%, #e0e7ff 100%);
  padding: 12px;
  border-radius: 12px;
}

.stat-icon i {
  color: #2563eb;
  font-size: 20px;
}

.stat-change {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.875rem;
  font-weight: 600;
}

.stat-change.positive {
  color: #059669;
}

.stat-change.negative {
  color: #dc2626;
}

.stat-value {
  font-size: 1.875rem;
  font-weight: 700;
  color: #1f2937;
  margin-bottom: 4px;
}

.stat-title {
  color: #6b7280;
  font-size: 0.875rem;
  font-weight: 600;
}

.stat-description {
  color: #9ca3af;
  font-size: 0.75rem;
  margin-top: 4px;
}

/* Chart Container */
.chart-container {
  background: white;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  border: 1px solid #f3f4f6;
  margin-bottom: 32px;
}

.chart-header {
  margin-bottom: 24px;
}

.chart-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: #1f2937;
  margin-bottom: 8px;
}

.chart-description {
  color: #6b7280;
  font-size: 0.875rem;
}

.chart-canvas {
  position: relative;
  height: 400px;
}

/* Footer */
.footer {
  text-align: center;
  margin-top: 32px;
  color: #9ca3af;
  font-size: 0.875rem;
}

/* Loading State */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 50vh;
  gap: 16px;
}

.spinner {
  border: 3px solid #f3f4f6;
  border-top: 3px solid #2563eb;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 16px;
  }

  .header-content {
    flex-direction: column;
    text-align: center;
  }

  .title {
    font-size: 1.5rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .chart-container {
    padding: 16px;
  }

  .chart-canvas {
    height: 300px;
  }
}