* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background-color: #70c5ce;
    text-align: center;
}

/* Login Page */
.login-container {
    width: 90%;
    max-width: 350px;
    margin: 50px auto;
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0px 0px 10px gray;
}

.login-container input {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: 1px solid gray;
    border-radius: 5px;
    font-size: 16px;
}

.login-container button {
    width: 100%;
    padding: 12px;
    background: #ffcc00;
    border: none;
    cursor: pointer;
    border-radius: 5px;
    font-size: 18px;
}

.login-container button:hover {
    background: #ffdd44;
}

#error-message {
    color: red;
    margin-top: 10px;
}

/* Game Container */
.game-container {
    position: relative;
    display: inline-block;
    width: 100%;
    max-width: 450px;
    margin: auto;
}

/* Responsive Canvas */
canvas {
    display: block;
    width: 100%;
    height: auto;
    background: url('https://i.postimg.cc/rwjdcc6b/bk-4.jpg') repeat-x;
    border: 2px solid #000;
}

/* Start screen */
.start-screen {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 15px;
    border-radius: 10px;
    font-size: 16px;
}

/* Game Over Popup */
.modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    width: 80%;
    max-width: 350px;
}

/* Pause Button */
#pauseButton {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 10px;
    background: #ffcc00;
    border: none;
    cursor: pointer;
    font-size: 16px;
    border-radius: 5px;
}

/* Responsive Adjustments */
@media screen and (max-width: 480px) {
    .start-screen {
        font-size: 14px;
        padding: 10px;
    }

    .modal-content {
        font-size: 14px;
    }

    .login-container {
        max-width: 280px;
    }

    .login-container input {
        font-size: 14px;
        padding: 10px;
    }

    .login-container button {
        font-size: 16px;
        padding: 10px;
    }

    #pauseButton {
        font-size: 14px;
        padding: 8px;
    }
}