:root {
  --bg-dark: #0a0e27;
  --bg-card: rgba(15, 23, 42, 0.9);
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --danger: #ef4444;
  --border: rgba(148, 163, 184, 0.1);
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #0a0e27 0%, #1e293b 100%);
  color: var(--text-primary);
  min-height: 100vh;
  padding: 2rem;
}

.chart-container {
  max-width: 1400px;
  margin: 0 auto;
  background: var(--bg-card);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border);
  flex-wrap: wrap;
  gap: 1rem;
}

#chart-title {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.chart-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

select, .btn-primary, .btn-secondary {
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(30, 41, 59, 0.8);
  color: var(--text-primary);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

select:hover, select:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  border: none;
  font-weight: 600;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
  background: rgba(30, 41, 59, 0.8);
  margin-top: 1rem;
}

.btn-secondary:hover {
  background: rgba(30, 41, 59, 1);
}

.chart-wrapper {
  margin-bottom: 2rem;
}

.chart-canvas {
  width: 100%;
  height: 500px;
  background: rgba(10, 14, 39, 0.5);
  border-radius: 15px;
  padding: 2rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--text-secondary);
}

.chart-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.info-card {
  background: rgba(30, 41, 59, 0.6);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: transform 0.3s ease;
}

.info-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.info-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.info-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.info-value.positive {
  color: var(--success);
}

.info-value.negative {
  color: var(--danger);
}

.chart-footer {
  text-align: center;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.chart-note {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* Loading animation */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.loading {
  animation: pulse 1.5s ease-in-out infinite;
}

/* Responsive */
@media (max-width: 768px) {
  body {
    padding: 1rem;
  }

  .chart-container {
    padding: 1rem;
  }

  #chart-title {
    font-size: 1.5rem;
  }

  .chart-header {
    flex-direction: column;
    align-items: stretch;
  }

  .chart-controls {
    flex-direction: column;
  }

  .chart-canvas {
    height: 300px;
    padding: 1rem;
  }

  .info-card {
    padding: 1rem;
  }
}