body {
    background-image: url("https://images.unsplash.com/photo-1525547719571-a2d4ac8945e2?q=80&w=464&auto=format&fit=crop&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D");
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    min-height: 100vh;
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.header {
    max-width: 400px; 
    margin: 50px 0 0 30px; 
    background-color: rgba(255, 255, 255, 0.85); 
    border-radius: 25px;
    padding: 30px 40px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    align-items: center; 
    gap: 20px;
}

.container {
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center; 
}

h1 {
    color: #263A29;
    font-size: 42px;
    margin: 0;
    font-weight: 700;
    user-select: none;
}

.instruction {
    color: #555;
    font-size: 18px;
    margin-top: 10px;
    text-align: center;
    font-style: italic;
}

.div {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#guess {
    width: 100%;
    max-width: 350px;
    padding: 20px;
    border-radius: 20px;
    border: 1.5px solid #ccc;
    font-size: 18px;
    outline: none;
    transition: border-color 0.3s ease;
}

#guess:focus {
    border-color: #4CAF50;
}

#btn {
    margin-top: 20px;
    width: 150px;
    padding: 15px 0;
    border-radius: 20px;
    background-color: #B33791;
    font-size: 20px;
    color: black;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#btn:hover {
    background-color: #ff9a7a;
}

@media all and (max-width: 500px) {
    .header {
        max-width: 90%;
        margin-left: 5%;
        padding: 20px;
    }

    #guess {
        max-width: 100%;
        font-size: 16px;
        padding: 15px;
    }

    #btn {
        width: 100%;
        font-size: 18px;
        padding: 12px 0;
    }

    h1 {
        font-size: 32px;
    }
}