body { font-family: sans-serif; max-width: 800px; margin: auto; padding: 1em; }
section { margin:1.5em 0; border:1px solid #ccc; padding:1em; border-radius:8px; }
video { width:100%; max-width:640px; border:1px solid #666; display:block; margin:auto; }
#settings { margin-top:1em; }
button:disabled { opacity:0.5; }
#attendance-list { position:fixed; top:1em; right:1em; width:250px; max-height:80vh; overflow-y:auto; border:1px solid #ccc; padding:0.5em; border-radius:4px; background:#fafafa; }
#attendance-list h3 { margin-top:0; font-size:1.1em; }
#attendance-log { list-style:none; padding-left:0; }
#attendance-log li { margin:0.3em 0; font-size:0.95em; }