html, body, div, canvas, img, a, button {
    touch-action: manipulation;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

body {
    font-size: 16px;
    overflow: hidden;
    margin: 0;
    padding: 0;
    background-color: #0f172a;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

#orientation-hint {
    display: none;
    position: fixed;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.92);
    color: #f8fafc;
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 8px 18px;
    border-radius: 24px;
    font-size: 13px;
    font-weight: 500;
    z-index: 999999;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
    text-align: center;
    pointer-events: none;
    white-space: nowrap;
}

@media screen and (max-width: 900px) and (orientation: portrait) {
    #orientation-hint {
        display: block;
    }
}