body { font-family: monospace; max-width: 900px; margin: 2rem auto; padding: 0 1rem; color: #333; }
h1 { font-size: 1.2rem; }
label { display: block; margin: .75rem 0; }
input, select { display: block; margin-top: .25rem; }
button { margin-top: 1rem; padding: .5rem 1.5rem; cursor: pointer; font-size: 1rem; }
#status { margin-top: 1rem; font-weight: bold; }
#result { margin-top: 1rem; }
pre { background: #f0f0f0; padding: 1rem; border-radius: 4px; }
.pass { border-left: 4px solid #4caf50; }
.fail { border-left: 4px solid #f44336; }
.container a { display: inline-block; margin-top: 1rem; }