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

body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background-color: #000;
    font-family: Arial, sans-serif;
    touch-action: none;
}

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

#controls {
    position: fixed;
    bottom: 20px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    z-index: 1000;
}

.middle-row {
    display: flex;
    gap: 5px;
}

.control-btn {
    width: 60px;
    height: 60px;
    background-color: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 10px;
    color: white;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.1s;
}

.control-btn:active {
    background-color: rgba(255, 255, 255, 0.4);
    transform: scale(0.95);
}

#btn-up {
    margin-left: 65px;
}

canvas {
    display: block;
}