* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: system-ui, sans-serif; max-width: 700px; margin: 2rem auto; padding: 0 1rem; line-height: 1.6; }
nav { margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 1px solid #ddd; }
nav a { margin-right: 1rem; color: #0366d6; text-decoration: none; }
nav a:hover { text-decoration: underline; }
h1 { margin-bottom: 1rem; }
h2 { margin: 1.5rem 0 0.5rem; }
p { margin: 0.5rem 0; }
form { margin: 1rem 0; }
label { display: block; margin: 0.5rem 0; }
input, select { margin-left: 0.5rem; padding: 0.25rem 0.5rem; }
button { margin-top: 0.5rem; padding: 0.5rem 1rem; cursor: pointer; }
table { border-collapse: collapse; margin: 1rem 0; }
th, td { border: 1px solid #ddd; padding: 0.5rem; text-align: left; }
th { background: #f6f8fa; }