:root {
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --link-color: #0066cc;
  --link-hover: #004c99;
  --background: #ffffff;
  --max-width: 600px;
  --spacing: clamp(2rem, 10vh, 8rem);
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Arial, sans-serif;
  background: var(--background);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.container {
  max-width: var(--max-width);
  width: 100%;
  text-align: center;
  padding: var(--spacing) 1rem;
}

h1 {
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 300;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.back-link {
  display: inline-flex;
  align-items: center;
  color: var(--link-color);
  text-decoration: none;
  font-size: 1rem;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.back-link:hover {
  color: var(--link-hover);
  background: rgba(0, 102, 204, 0.05);
}

.back-link::before {
  content: "←";
  margin-right: 0.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #ffffff;
    --text-secondary: #a3a3a3;
    --link-color: #66b3ff;
    --link-hover: #99ccff;
    --background: #1a1a1a;
  }
}