body {
    font-family: Arial, sans-serif;
    background-color: #535353;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    text-align: center;
    background: rgb(92, 92, 92);
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    padding: 20px;
}

h1 {
    margin-bottom: 20px;
}

.bingo-board {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    grid-gap: 5px;
    margin-bottom: 20px;
}

.bingo-square {
    width: 80px;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #e9ecef;
    border: 1px solid #ced4da;
    border-radius: 4px;
    cursor: pointer;
    user-select: none;
    font-size: 14px;
    text-align: center;
    padding: 4px;
}

.bingo-square.completed {
    background: #a90000;
    color: white;
    text-decoration: line-through;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

button {
    padding: 10px;
    border: none;
    border-radius: 4px;
    background: #007bff;
    color: white;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}

input {
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: 4px;
}

.toast {
    position: fixed;
    bottom: -50px; /* Start off-screen */
    left: 50%;
    transform: translateX(-50%);
    background-color: #333;
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    font-size: 14px;
    opacity: 0;
    transition: opacity 0.3s, bottom 0.3s;
    z-index: 1000;
}

.toast.show {
    bottom: 20px; /* Slide up */
    opacity: 1;
}