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

:root {
  --color-bg: #fafafa;
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-accent: #0066cc;
  --color-accent-hover: #0052a3;
  --font-stack: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #111;
    --color-text: #f0f0f0;
    --color-text-muted: #999;
    --color-accent: #4da6ff;
    --color-accent-hover: #80bfff;
  }
}

html {
  font-size: 18px;
  line-height: 1.6;
}

body {
  font-family: var(--font-stack);
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem;
}

main {
  text-align: center;
  max-width: 480px;
}

h1 {
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.intro {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

.links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.links a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
}

.links a:hover,
.links a:focus {
  border-bottom-color: var(--color-accent);
}

.links a:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 2px;
}

footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  padding: 1.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

@media (max-width: 480px) {
  html {
    font-size: 16px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  body {
    padding: 1.5rem;
  }
  
  .links {
    gap: 1rem;
  }
}