/* Navigation */
.nav-link {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    margin-left: 15px;
    padding: 8px 16px;
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    transition: all 0.2s;
}

.nav-link:hover {
    background-color: var(--primary-color);
    color: white;
}

.nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

/* Updated Buttons */
.controls {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    justify-content: center;
}

.btn-know {
    background-color: var(--success-color);
    color: white;
    flex: 1;
}

.btn-review {
    background-color: #f1c40f;
    /* Yellow/Orange for review */
    color: white;
    flex: 1;
}

.btn-dont-know {
    background-color: var(--danger-color);
    color: white;
    flex: 1;
}