body {
    margin: 0;
    padding: 0;
    color: rgba(255, 255, 255, 0.87);
    background-color: #0f0f0f;
}

#app {
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

#rotate-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: #0a100a;
    z-index: 10000;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #d8e8c0;
    font-family: monospace;
    gap: 20px;
    font-size: 16px;
    text-align: center;
    padding: 24px;
    box-sizing: border-box;
}

/* Show rotate prompt on touch devices in portrait mode */
@media screen and (orientation: portrait) and (pointer: coarse) {
    #rotate-overlay { display: flex; }
}