body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: #000;
    font-family: Arial, sans-serif;
}
header {
    text-align: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    width: 100%;
    max-width: 800px;
}
header h1 {
    font-size: 2.5em;
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}
header p {
    font-size: 1.2em;
    margin: 10px 0 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.4;
}
#globeViz {
    width: 100vw;
    height: 100vh;
}
#popup {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 20px;
    border-radius: 10px;
    max-width: 300px;
    display: none;
    z-index: 10;
}
#popup h1 {
    margin: 0;
}
#popup p {
    margin: 10px 0;
}
#popup button {
    margin: 10px 5px 0;
    padding: 5px 10px;
    background: rgba(255, 0, 0, 0.8);
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 5px;
}
#shareBtn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(255, 0, 0, 0.8);
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 5px;
    padding: 5px;
    font-size: 16px;
}
#closeBtn {
    float: right;
    background: rgba(0, 0, 0, 0.5);
    color: white;
    font-size: 20px;
    line-height: 20px;
}
.footer {
    position: fixed;
    bottom: 10px;
    left: 0;
    width: 100%;
    text-align: center;
    font-size: 0.8em;
    color: #999;
    z-index: 10;
}
.footer a {
    color: #ccc;
    text-decoration: none;
}