html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background: #1b0f12;
    overflow: hidden;
    overscroll-behavior: none;
    touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

#app {
    position: fixed;
    inset: 0;
    box-sizing: border-box;
    /* keep the HUD and buttons clear of notches and the home indicator */
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
    background: radial-gradient(ellipse at center, #3a2118 0%, #1b0f12 70%);
}

#rotate-hint {
    display: none;
}

/* the game is portrait-only: on a phone held sideways, ask to turn it */
@media (orientation: landscape) and (pointer: coarse) and (max-height: 520px) {
    #rotate-hint {
        position: fixed;
        inset: 0;
        z-index: 10;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-direction: column;
        gap: 12px;
        background: #1b0f12;
        color: #ffc23c;
        font: 900 20px "Arial Black", "Trebuchet MS", Impact, sans-serif;
        text-align: center;
    }
    #rotate-hint span {
        font-size: 44px;
        display: block;
        animation: rotate-hint-tilt 1.6s ease-in-out infinite;
    }
}

@keyframes rotate-hint-tilt {
    0%, 100% { transform: rotate(-90deg); }
    50% { transform: rotate(0deg); }
}

#game-container {
    width: 100%;
    height: 100%;
}

canvas {
    display: block;
    touch-action: none;
    image-rendering: auto;
}