css/style.css
/* Base reset */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: #ffffff;
  color: #222;
  line-height: 1.8;
}

/* Layout */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px;
}

/* Headings */
h1 {
  font-size: 2.2rem;
  margin-bottom: 8px;
}

h2 {
  font-size: 1.5rem;
  margin-top: 48px;
  margin-bottom: 12px;
}

h3 {
  font-size: 1.2rem;
  margin-top: 28px;
}

/* Text */
p {
  margin: 12px 0;
  font-size: 1rem;
}

/* Q&A articles */
article {
  margin-bottom: 56px;
  padding-bottom: 24px;
  border-bottom: 1px solid #eee;
}

/* Short answer highlight */
strong {
  color: #000;
}

/* Links */
a {
  color: #0b5ed7;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Footer */
footer {
  text-align: center;
  padding: 32px 16px;
  font-size: 0.9rem;
  color: #666;
  border-top: 1px solid #eee;
}

/* Mobile */
@media (max-width: 600px) {
  main {
    padding: 32px 16px;
  }

  h1 {
    font-size: 1.8rem;
  }
}