/* Base styles */
:root {
  --text: #1a1a1a;
  --background: #ffffff;
  --primary: #ffed4a;
  --secondary: #f3f4f6;
  --accent: #2563eb;
  --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, Monaco, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
  color: var(--text);
  background: var(--background);
}

body {
  margin: 0;
  line-height: inherit;
  -webkit-font-smoothing: antialiased;
}

/* Layout */
.container {
  max-width: 65rem;
  margin: 0 auto;
  padding: 1rem;
}

/* Header */
.header {
  border-bottom: 1px solid var(--secondary);
  padding: 1rem 0;
  margin-bottom: 2rem;
}

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

.logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--text);
}

/* Main content */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.card {
  background: var(--background);
  border: 1px solid var(--secondary);
  border-radius: 0.5rem;
  overflow: hidden;
}

.card-header {
  padding: 1rem;
  border-bottom: 1px solid var(--secondary);
}

.card-title {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.card-value {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  color: var(--text);
}

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

.card-footer {
  padding: 0.75rem 1rem;
  background: var(--secondary);
  font-size: 0.75rem;
}

.card-footer a {
  color: var(--accent);
  text-decoration: none;
}

.card-footer a:hover {
  text-decoration: underline;
}

/* Utilities */
.mono {
  font-family: var(--font-mono);
}

.text-sm {
  font-size: 0.875rem;
}

.text-xs {
  font-size: 0.75rem;
}

/* Footer */
.footer {
  border-top: 1px solid var(--secondary);
  padding: 2rem 0;
  margin-top: 2rem;
}

.footer-content {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text);
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0.5rem;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
  
  .card-value {
    font-size: 1.5rem;
  }
}