body {
    margin: 0;
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: #f4f6fa;
}
header {
    background: #2c3e50;
    color: #fff;
    padding: 1em 2em;
    text-align: center;
    font-size: 1.5em;
    letter-spacing: 2px;
}
#controls {
    background: #fff;
    padding: 1em 2em;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1em;
}
#map {
    width: 100vw;
    height: calc(100vh - 120px);
    margin: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
select, input, button {
    font-size: 1em;
    padding: 0.3em 0.6em;
    border-radius: 4px;
    border: 1px solid #ccc;
}
button {
    background: #3498db;
    color: #fff;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
}
button:hover {
    background: #217dbb;
}