* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    min-height: -webkit-fill-available;
    background: #000;
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
    touch-action: none;
    -ms-touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

#gameCanvas {
    display: block;
    background: #000;
    max-width: 100%;
    max-height: 100%;
    margin: 0 auto;
}

.orientation-message {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    flex-direction: column;
}

.orientation-message.show {
    display: flex;
}

.orientation-text {
    color: #ffff00;
    font-size: 32px;
    font-weight: bold;
    text-align: center;
    font-family: Arial, sans-serif;
    padding: 20px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.05);
    }
}

/* Prevent zoom on double tap */
canvas {
    touch-action: none;
    -ms-touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

html {
    touch-action: manipulation;
    -ms-touch-action: manipulation;
}