* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #0a0a1a;
    touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Helvetica Neue', sans-serif;
}

#game-container {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1;
}

#game-container canvas {
    display: block;
}

#rotate-tip {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    color: #fff;
    font-size: 20px;
}

#rotate-tip .rotate-icon {
    font-size: 60px;
    animation: rotateHint 1.5s ease-in-out infinite;
    margin-bottom: 20px;
}

@keyframes rotateHint {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(-90deg); }
    75% { transform: rotate(90deg); }
}

@media (orientation: landscape) {
    #rotate-tip {
        display: flex !important;
    }
    #game-container {
        display: none !important;
    }
}

@supports (padding: env(safe-area-inset-top)) {
    body {
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }
}