* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

main {
    width: 100vw;
    height: 100vh;
    position: relative;
}

.info-button {
    position: absolute;
    bottom: 10px;
    left: 10px;
    width: 30px;
    height: 30px;
    background: #666;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease;
}

.info-button:hover {
    background: #888;
}

.attribution {
    position: absolute;
    bottom: 50px;
    left: 10px;
    color: white;
    font-family: Arial, sans-serif;
    font-size: 12px;
    z-index: 10;
    background: rgba(0, 0, 0, 0.8);
    padding: 10px;
    border-radius: 5px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    max-width: 300px;
    line-height: 1.4;
}

.attribution.show {
    opacity: 1;
    visibility: visible;
}

.attribution A {
    color: #CCC;
}