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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #000;
}

#game-root {
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000;
}

#game-canvas {
    display: block;
    max-width: 100vw;
    max-height: 100vh;
    width: auto;
    height: auto;
}

#game-tooltip {
    position: fixed;
    pointer-events: none;
    padding: 6px 10px;
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    border-radius: 6px;
    font: 500 13px/1.2 Roboto, sans-serif;
    border: 1px solid rgba(255,255,255,0.15);
    z-index: 10;
    display: none;
    white-space: nowrap;
}