body {
    margin: 0;
    overflow: hidden;
    background-color: #111;
    color: #fff;
    font-family: sans-serif;
}

canvas {
    display: block;
}

#ui-container {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 10px;
    background-color: rgba(0, 0, 0, 0.7);
    border-radius: 8px;
    display: grid;
    grid-template-columns: auto auto;
    gap: 10px 20px;
    align-items: center;
}

.ui-label {
    font-weight: bold;
    color: #aaa;
}

#score, #lines {
    font-size: 1.2em;
    font-weight: bold;
}

#next-block-container {
    width: 100px;
    height: 100px;
    grid-column: span 2;
    border: 1px solid #555;
    background-color: rgba(0, 0, 0, 0.2);
}

#instructions {
    position: absolute;
    bottom: 10px;
    left: 10px;
    padding: 10px;
    background-color: rgba(0, 0, 0, 0.7);
    border-radius: 8px;
    font-size: 0.9em;
    line-height: 1.4;
}

#modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

#start-modal, #gameover-modal {
    padding: 40px;
    background-color: #222;
    border-radius: 10px;
}

h1, h2 {
    margin-top: 0;
}

button {
    padding: 10px 20px;
    font-size: 1.2em;
    cursor: pointer;
    background-color: #444;
    color: #fff;
    border: 1px solid #666;
    border-radius: 5px;
}

button:hover {
    background-color: #555;
}