.screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f3f4f6;
}

.hidden {
    display: none;
}

.title-container {
    text-align: center;
    max-width: 100%;
    padding: 20px;
}

.title-image {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
}

.play-button {
    position: fixed;
    left: 50%;
    bottom: 25%;
    transform: translateX(-50%);
    font-size: 24px;
    padding: 15px 60px;
    border: none;
    border-radius: 30px;
    background-color: #4CAF50;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

.tutorial-button {
    font-size: 24px;
    padding: 15px 60px;
    border: none;
    border-radius: 30px;
    background-color: #4CAF50;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

.play-button:active,
.tutorial-button:active {
    background-color: #357a38;
}

.tutorial-container {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    max-width: 80%;
    text-align: center;
}

.tutorial-content {
    text-align: left;
    margin: 20px 0;
    font-size: 18px;
    line-height: 1.6;
}

.countdown-number {
    font-size: min(80px, 12vw);
    font-weight: bold;
    color: #4CAF50;
}