body, html {
    margin: 0;
    padding: 0;
    height: 100%;
}

#map {
    width: 100%;
    height: 100vh;
}

/* Legend */
#legend {
    position: absolute;      /* overlay on top of the map */
    bottom: 20px;            /* distance from bottom */
    left: 20px;              /* distance from left */
    background: rgba(255, 255, 255, 0.95);
    padding: 12px;
    border-radius: 6px;
    font-family: sans-serif;
    font-size: 14px;
    box-shadow: 0 0 6px rgba(0,0,0,0.3);
    z-index: 1;              /* ensure it stays above the map */
}

#legend h4 {
    margin: 0 0 8px 0;
    font-weight: bold;
    font-size: 16px;
}

#legend div {
    display: flex;
    align-items: center;
    margin-bottom: 4px;
}

#legend span {
    display: inline-block;
    width: 25px;
    height: 18px;
    margin-right: 8px;
    border: 1px solid #555;
}