html {
    overflow: hidden;
    height: 100%;
    background: #191919;
    width: 100%;
}

body {
    margin: 0;
    padding: 0;
    height: 100%;
}

#hud {
    position: fixed;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    font-family: Arial, sans-serif;
}

#timer {
    padding: 6px 16px;
    font-size: 20px;
    font-weight: bold;
    color: #fff;
    background: rgba(0,0,0,0.6);
    border-radius: 999px;
}

#canvas {
    background: url('https://marclopezavila.github.io/planet-defense-game/img/space.jpg') no-repeat;
    width: 100vw;
    height: 100vh;
    display: block;
    background-size: cover;
}

#canvas.playing {
    cursor: url('https://marclopezavila.github.io/planet-defense-game/img/aim_red.png') 17.5 17.5,auto !important;
}

/* touch controls */
#controls {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 20px;
    display: flex;
    justify-content: center;
    pointer-events: none; /* let canvas still receive events except on button */
}

#shootBtn {
    pointer-events: auto;
    padding: 12px 28px;
    font-size: 18px;
    font-family: Arial, sans-serif;
    border-radius: 999px;
    border: none;
    background: #e53935;
    color: #fff;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
}

#shootBtn:active {
    transform: scale(0.95);
}

@media (max-width: 600px) {
    #shootBtn {
        padding: 14px 36px;
        font-size: 20px;
    }
}