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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #eee;
}

canvas {
    display: block;
    width: 100vw;
    height: 100vh;
    border: 4px solid #00ffe7;
    border-radius: 10px;
    box-shadow: 0 0 20px #00ffe7aa;
    background-color: #111;
}

/* Overlay für Steuerungshinweise */
#overlay {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.5);
    padding: 10px 20px;
    border-radius: 12px;
    font-size: 14px;
    user-select: none;
    pointer-events: none;
    letter-spacing: 0.05em;
}