html, body, #map { 
    margin: 0; 
    padding: 0; 
    width: 100vw; 
    height: 100vh; 
}
canvas { 
    display: block; 
}
#map-legend {
    position: fixed;
    top: 10px;
    left: 10px;
    background: rgba(255,255,255,0.9);
    padding: 8px 12px;
    font-family: sans-serif;
    font-size: 14px;
    border-radius: 4px;
    box-shadow: 0 0 6px rgba(0,0,0,0.3);
    pointer-events: none; /* so clicks pass through */
}
#layer-toggle {
    position: fixed;
    top: 10px;
    right: 10px;
    z-index: 10;
    padding: 6px 8px;
    font-size: 14px;
    border-radius: 4px;
    background: white;
    box-shadow: 0 1px 4px rgba(0,0,0,0.3);
}