.exercise-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.exercise-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.exercise-leerlijn {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.exercise-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.exercise-card {
    background-color: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.exercise-question {
    padding: var(--spacing-8);
    text-align: center;
    background: linear-gradient(135deg, var(--color-primary-50), white);
    border-bottom: 1px solid var(--color-gray-200);
}

.question-label {
    display: block;
    margin-bottom: var(--spacing-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.question-math {
    font-size: var(--font-size-3xl);
    color: var(--color-gray-900);
}

.question-math .katex {
    font-size: 1.5em;
}

.exercise-context {
    padding: var(--spacing-4) var(--spacing-6);
    background-color: var(--color-primary-50);
    border-bottom: 1px solid var(--color-primary-100);
}

.exercise-answer {
    padding: var(--spacing-6);
}

.answer-input-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    justify-content: center;
}

.answer-prefix {
    font-size: var(--font-size-xl);
    color: var(--color-gray-600);
}

.answer-input {
    width: 200px;
    padding: var(--spacing-4);
    font-size: var(--font-size-xl);
    text-align: center;
    border: 3px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.answer-input:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px var(--color-primary-100);
}

.answer-input.correct {
    border-color: var(--color-success-500);
    background-color: var(--color-success-50);
}

.answer-input.incorrect {
    border-color: var(--color-error-500);
    background-color: var(--color-error-50);
}

/* Breuk invoerveld - wiskundige notatie */
.fraction-input-container {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    vertical-align: middle;
}

.fraction-input-container .fraction-numerator,
.fraction-input-container .fraction-denominator {
    width: 80px;
    padding: var(--spacing-2);
    font-size: var(--font-size-xl);
    text-align: center;
    border: 2px solid var(--color-gray-300);
    background-color: white;
    transition: all var(--transition-fast);
}

.fraction-input-container .fraction-numerator {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    border-bottom: none;
}

.fraction-input-container .fraction-denominator {
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    border-top: none;
}

.fraction-input-container .fraction-line {
    width: 90px;
    height: 3px;
    background-color: var(--color-gray-800);
}

.fraction-input-container .fraction-numerator:focus,
.fraction-input-container .fraction-denominator:focus {
    outline: none;
    border-color: var(--color-primary-500);
    z-index: 1;
}

.fraction-input-container.correct .fraction-numerator,
.fraction-input-container.correct .fraction-denominator {
    border-color: var(--color-success-500);
    background-color: var(--color-success-50);
}

.fraction-input-container.correct .fraction-line {
    background-color: var(--color-success-600);
}

.fraction-input-container.incorrect .fraction-numerator,
.fraction-input-container.incorrect .fraction-denominator {
    border-color: var(--color-error-500);
    background-color: var(--color-error-50);
}

.fraction-input-container.incorrect .fraction-line {
    background-color: var(--color-error-600);
}

/* Combinatie van breuk en variabele invoer */
.combined-answer-input {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
}

.combined-answer-input .variable-part {
    font-size: var(--font-size-2xl);
    color: var(--color-gray-800);
}

.exercise-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-4);
    padding: var(--spacing-4) var(--spacing-6);
    border-top: 1px solid var(--color-gray-200);
    background-color: var(--color-gray-50);
}

.exercise-nav {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-4);
}

/* Wrapper voor input met symboolknoppen */
.answer-input-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-2);
}

/* Symboolknoppen onder invoerveld */
.symbol-buttons {
    display: flex;
    gap: var(--spacing-1);
}

.symbol-btn {
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-sm);
    font-family: inherit;
    background-color: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    color: var(--color-gray-700);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.symbol-btn:hover {
    background-color: var(--color-gray-200);
    border-color: var(--color-gray-400);
}

.symbol-btn:active {
    background-color: var(--color-gray-300);
}