body {
    font-family: 'Open Sans', sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-image: url('background_pattern.png');
    background-size: cover;
    color: #333;
    padding: 20px;
    box-sizing: border-box;
}

.container {
    background-color: #fff;
    border-radius: 25px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    padding: 30px 40px;
    text-align: center;
    max-width: 900px;
    width: 100%;
    border: 8px solid #FFD700; /* Gold border for a fun look */
    box-sizing: border-box;
}

header {
    margin-bottom: 30px;
}

h1 {
    font-family: 'Fredoka One', cursive;
    color: #FF69B4; /* Hot Pink */
    font-size: 2.8em;
    margin-bottom: 10px;
    text-shadow: 2px 2px #4CAF50; /* Green shadow */
}

.professor-bubbles {
    width: 150px;
    height: auto;
    margin-bottom: 20px;
}

.quiz-area {
    background-color: #E0FFFF; /* Light Cyan */
    border-radius: 20px;
    padding: 25px;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.1);
    border: 5px dashed #87CEEB; /* Sky Blue dashed border */
}

.sticker-display {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    font-family: 'Fredoka One', cursive;
    font-size: 1.8em;
    color: #FFA500; /* Orange */
    text-shadow: 1px 1px #fff;
}

.sticker-icon {
    width: 50px;
    height: 50px;
    margin-right: 10px;
}

#sticker-count {
    color: #4CAF50; /* Green for count */
}

#question-text {
    font-family: 'Open Sans', sans-serif;
    font-size: 1.6em;
    color: #6A5ACD; /* Slate Blue */
    margin-bottom: 30px;
    font-weight: 700;
}

.answer-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 30px;
}

.answer-button {
    background-color: #ADD8E6; /* Light Blue */
    color: #333;
    border: none;
    padding: 18px 25px;
    border-radius: 12px;
    font-family: 'Open Sans', sans-serif;
    font-size: 1.3em;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 5px 0 #6A5ACD; /* Darker blue shadow */
    font-weight: 700;
    text-align: left;
}

.answer-button:hover {
    background-color: #87CEEB; /* Sky Blue */
    transform: translateY(-3px);
    box-shadow: 0 8px 0 #6A5ACD;
}

.answer-button:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #6A5ACD;
}

.feedback-message {
    font-family: 'Fredoka One', cursive;
    font-size: 1.5em;
    margin-bottom: 25px;
    min-height: 40px; /* To prevent layout shift */
}

.feedback-message.correct {
    color: #4CAF50; /* Green */
}

.feedback-message.wrong {
    color: #FF4500; /* Orange Red */
}

.action-button {
    background-color: #FFD700; /* Gold */
    color: #8B4513; /* Saddle Brown */
    border: none;
    padding: 15px 30px;
    border-radius: 12px;
    font-family: 'Fredoka One', cursive;
    font-size: 1.6em;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 6px 0 #DAA520; /* Darker gold shadow */
    margin-top: 20px;
}

.action-button:hover {
    background-color: #DAA520; /* Darker Gold */
    transform: translateY(-3px);
    box-shadow: 0 9px 0 #B8860B;
}

.action-button:active {
    transform: translateY(2px);
    box-shadow: 0 3px 0 #B8860B;
}

.quiz-complete-section {
    background-color: #FFFACD; /* Lemon Chiffon */
    padding: 30px;
    border-radius: 20px;
    border: 5px solid #FFD700;
}

#quiz-complete-message {
    font-family: 'Fredoka One', cursive;
    font-size: 2em;
    color: #6A5ACD;
    margin-bottom: 30px;
    line-height: 1.4;
}

.hidden {
    display: none;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2em;
    }
    .answer-buttons {
        grid-template-columns: 1fr;
    }
    .answer-button {
        font-size: 1.1em;
        padding: 15px 20px;
    }
    .action-button {
        font-size: 1.3em;
        padding: 12px 25px;
    }
    #question-text {
        font-size: 1.3em;
    }
    .sticker-display {
        font-size: 1.5em;
    }
    #quiz-complete-message {
        font-size: 1.5em;
    }
}