:root {
  --primary-color: #3b82f6;
  --text-color: #333;
  --bg-color: #f4f4f9;
  --container-width: 800px;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  margin: 0;
  padding: 0;
}

.header {
  text-align: center;
  padding: 2rem 1rem;
  background: white;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.title {
  margin: 0;
  color: var(--primary-color);
  font-size: 2.5rem;
}

.subtitle {
  margin: 0.5rem 0 0 0;
  color: #64748b;
  font-size: 1rem;
}

.container {
  max-width: var(--container-width);
  margin: 2rem auto;
  padding: 2rem;
  background: white;
  min-height: 50vh;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  border-radius: 0.5rem;
}

.footer {
  text-align: center;
  padding: 1.5rem;
  color: #64748b;
}

h1, h2, h3 {
  margin-top: 0;
}

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

a:hover {
  text-decoration: underline;
}