body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #f4f4f9;
    margin: 0;
}

.top {
    position: absolute;
    top: 10px;
    left: 10px;
}

.top img {
    height: 40px;
    padding: 5px;
    margin: 5px; 
}

.container {
    text-align: center;
    width: 100%;
    max-width: 500px;
    padding: 10px;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
    margin: 20px auto;
    width: 100%;
    max-width: 300px;
    aspect-ratio: 1 / 1;
}

.tile {
    display: flex;
    justify-content: center;
    align-items: center;
    background: #3498db;
    color: white;
    font-size: clamp(16px, 5vw, 24px);
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.3s;
}

.tile.empty {
    background: #ccc;
    cursor: default;
}

.tile.movable {
    background: #2ecc71 !important;
    box-shadow: 0 0 15px #2ecc71;
}

.controls {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}

button {
    margin: 5px;
    padding: 8px 14px;
    border: none;
    border-radius: 6px;
    background: #444;
    color: white;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: #222;
}

.stats {
    margin-top: 10px;
    font-size: 14px;
}

.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: white;
    padding: 10px 20px;
    border-radius: 6px;
    opacity: 0;
    transition: opacity 0.5s;
    max-width: 90%;
    text-align: center;
}

.toast.show {
    opacity: 1;
}

@media (max-width: 500px) {
    .board {
        max-width: 90vw;
    }
    button {
        flex: 1 1 40%;
    }
}