html, body { margin: 0; padding: 0; font-family: Arial, sans-serif; }
#map { position: absolute; top: 0; left: 0; }
.tour-marker div { background: #4CAF50; color: white; border-radius: 50%; width: 20px; height: 20px; text-align: center; line-height: 20px; font-weight: bold; }
.user-marker { filter: drop-shadow(0 0 5px blue); }
#loading, #gps-status { border-radius: 5px; border: 1px solid #ccc; }