:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --text-color: #1f2937;
  --text-light: #4b5563;
  --text-lighter: #6b7280;
  --bg-color: #f9fafb;
  --bg-card: #ffffff;
  --border-color: #e5e7eb;
  
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  
  --radius: 0.75rem;
  --radius-sm: 0.5rem;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  color: #111827;
  line-height: 1.3;
  font-weight: 700;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  text-decoration: underline;
  color: var(--primary-hover);
}

img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-color);
  color: white;
  padding: 8px 16px;
  z-index: 100;
  font-weight: 600;
}

.skip-link:focus { top: 0; }