body {
    font-family: system-ui, sans-serif;
    background: #111;
    color: #eee;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    user-select: none;
}
#fischer-app {
    text-align: center;
}
h1 {
    margin-bottom: 40px;
    letter-spacing: 2px;
}
button {
    background: #333;
    color: #fff;
    border: 2px solid #555;
    padding: 15px 30px;
    margin: 10px;
    font-size: 18px;
    cursor: pointer;
    border-radius: 8px;
    transition: 0.2s;
    display: block;
    width: 300px;
}
button.active {
    background: #32CD32;
    border-color: #32CD32;
    color: #000;
    font-weight: bold;
}
button:hover:not(.active) {
    background: #444;
}
.install-link {
    text-decoration: none;
    display: inline-block;
    margin-top: 30px;
}
#btn-install {
    background: #222;
    border-color: #444;
    font-size: 14px;
    width: 200px;
    padding: 10px;
    color: #aaa;
}
#btn-install:hover {
    background: #333;
    color: #fff;
    border-color: #666;
}