.container {
    position: relative; 
    padding-top: 60px; 
    max-height: 95vh; 
    overflow-y: auto; 
}

h1 {
    color: var(--primary-blue); /* Ensure H1 color consistency with homepage */
    margin-bottom: 25px; 
    font-weight: 700; /* Ensure font weight consistency */
}

.math-problem-area {
    margin-top: 0; 
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 25px; 
    flex-grow: 1; 
    min-height: 0; 
}

#math-problem-text {
    font-size: clamp(2.5em, 7vw, 4.5em); 
    font-weight: 700; 
    color: var(--primary-blue); 
    margin-bottom: 0; 
}

#answer-input {
    padding: 15px 20px;
    font-size: 1.5em;
    border: 2px solid var(--secondary-green); 
    border-radius: 10px;
    width: clamp(150px, 60%, 250px); 
    text-align: center;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 2px 5px var(--shadow-light);
}

#answer-input:focus {
    border-color: var(--primary-blue); 
    box-shadow: 0 4px 8px var(--shadow-medium);
}

.math-controls {
    display: flex;
    gap: 15px;
    margin-top: 10px; 
    flex-wrap: wrap;
    justify-content: center;
}

.math-controls button {
    background-color: var(--accent-orange); 
    color: var(--text-light);
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    font-size: 1.2em;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 3px 6px var(--shadow-light);
    flex-grow: 1;
    min-width: 120px;
}

.math-controls button:hover {
    background-color: #e6a760;
    transform: translateY(-3px);
    box-shadow: 0 5px 10px var(--shadow-medium);
}

.math-controls button:active {
    transform: translateY(0);
    box-shadow: 0 1px 3px var(--shadow-light);
}

#feedback-message {
    font-size: 1.8em;
    font-weight: 600;
    margin-top: 20px;
    min-height: 1.5em; 
}

/* Specific colors for feedback messages */
#feedback-message.correct { color: var(--secondary-green); }
#feedback-message.incorrect { color: var(--accent-pink); }

.back-button {
    position: absolute;
    top: 25px;
    left: 25px;
    background-color: var(--primary-blue); 
    color: var(--text-light);
    padding: 10px 20px; 
    border: none;
    border-radius: 10px; 
    font-size: 1em; 
    font-weight: 600; 
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    z-index: 10;
    box-shadow: 0 3px 6px var(--shadow-light);
}

.back-button:hover {
    background-color: #5c8ae6; 
    transform: translateY(-3px);
    box-shadow: 0 5px 10px var(--shadow-medium);
}

.back-button:active {
    transform: translateY(0);
    box-shadow: 0 1px 3px var(--shadow-light);
}

/* Mobile-specific adjustments for very small screens */
@media (max-width: 480px) {
    .math-controls button {
        font-size: 1em;
        padding: 12px 25px;
    }
    .back-button {
        padding: 6px 12px;
        font-size: 0.8em;
        top: 15px; 
        left: 15px; 
        border-radius: 8px;
    }
    #math-problem-text {
        font-size: clamp(2em, 6vw, 4em); 
    }
    #answer-input {
        font-size: 1.2em;
        padding: 12px 15px;
    }
    #feedback-message {
        font-size: 1.4em;
    }
    .container {
        padding: 40px 20px 20px 20px; 
    }
}