body { margin:0; font-family: Arial, sans-serif; background:#111; color:#0ff; }
.app-container { text-align:center; padding:2rem; }
.logo { width:150px; margin-bottom:1rem; }
#leaderboard { margin-top:2rem; font-size:1.2rem; }
button { padding:0.5rem 1rem; background:#0ff; color:#111; border:none; cursor:pointer; font-size:1rem; margin:0.25rem; }
button:hover { background:#0cc; }
#segment-select { margin-bottom:1rem; }