* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
    width: 100%; height: 100%;
    overflow: hidden;
    background: #000;
    font-family: monospace;
    touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}
#game-container {
    width: 100%;
    height: calc(100% - 50px);
    position: relative;
}
#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
}
#ad-strip {
    width: 100%;
    height: 50px;
    background: #111;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    font-size: 11px;
    font-family: monospace;
}
#fs-btn {
    position: fixed;
    top: 6px;
    right: 6px;
    z-index: 9999;
    width: 32px;
    height: 32px;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.25);
    border-radius: 5px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}
#fs-btn:active { background: rgba(255,255,255,.25); }
#fs-btn svg { width: 18px; height: 18px; }
#fs-btn line, #fs-btn polyline { stroke: #fff; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; fill: none; }