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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #0d1117;
  color: #c9d1d9;
  padding: 24px;
  line-height: 1.6;
}

header {
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 2px solid #21262d;
}

header h1 {
  font-size: 2rem;
  color: #f0f6fc;
  margin-bottom: 8px;
}

.subtitle {
  color: #8b949e;
  font-size: 0.95rem;
}

.research-questions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.question-card {
  background: #161b22;
  border: 1px solid #21262d;
  border-radius: 8px;
  padding: 24px;
}

.question-card h3 {
  font-size: 1.1rem;
  color: #f0f6fc;
  margin-bottom: 16px;
  line-height: 1.4;
}

.analysis-section {
  margin-top: 16px;
  min-height: 300px;
}

/* Event study and CapEx trends charts */
.analysis-chart {
  width: 100%;
  height: 400px;
  background: #0d1117;
  border-radius: 4px;
  border: 1px solid #30363d;
}

/* Summary statistics table */
.summary-stats {
  background: #161b22;
  border: 1px solid #21262d;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 40px;
}

.summary-stats h2 {
  font-size: 1.3rem;
  color: #f0f6fc;
  margin-bottom: 20px;
}

.stats-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.stats-table thead {
  background: #0d1117;
  border-bottom: 2px solid #21262d;
}

.stats-table th,
.stats-table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid #21262d;
}

.stats-table th {
  font-weight: 600;
  color: #58a6ff;
}

.stats-table tr:hover {
  background: #0d1117;
}

.company-name {
  font-weight: 600;
  color: #f0f6fc;
}

.metric-highlight {
  color: #79c0ff;
  font-weight: 500;
}

.positive {
  color: #3fb950;
}

.negative {
  color: #f85149;
}

.neutral {
  color: #8b949e;
}

/* Analysis insights box */
.insights {
  background: #0d1117;
  border-left: 4px solid #58a6ff;
  padding: 16px;
  margin-top: 16px;
  border-radius: 4px;
  font-size: 0.9rem;
  line-height: 1.5;
}

.insights strong {
  color: #79c0ff;
}

/* Back link */
.back-link {
  text-align: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #21262d;
}

.back-link a {
  color: #58a6ff;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.back-link a:hover {
  color: #79c0ff;
  text-decoration: underline;
}

/* Tooltip styles */
.tooltip {
  position: absolute;
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 4px;
  padding: 8px 12px;
  font-size: 0.8rem;
  color: #c9d1d9;
  pointer-events: none;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.2s;
}

.tooltip.visible {
  opacity: 1;
}

/* Chart axes */
.axis {
  font-size: 11px;
  color: #8b949e;
}

.axis line,
.axis path {
  stroke: #30363d;
  stroke-width: 1px;
}

.grid {
  stroke: #21262d;
  stroke-width: 1px;
  stroke-dasharray: 4;
}

.grid line {
  stroke: #21262d;
  stroke-width: 1px;
}

/* Legend styles */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 16px;
  padding: 12px;
  background: #0d1117;
  border-radius: 4px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
}

.legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 2px;
}

/* Responsive */
@media (max-width: 1024px) {
  body {
    padding: 16px;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .analysis-section {
    min-height: 300px;
  }
}