/* Course Cards */
.course-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    opacity: 1;
    transform: translateY(0);
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.course-card .card-img-top {
    height: 200px;
    object-fit: cover;
}

.course-card .card-body {
    padding: 1.5rem;
}

.course-card .card-title {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--bs-dark);
}

.course-card .card-text {
    color: var(--bs-gray-600);
    margin-bottom: 1rem;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    color: var(--bs-gray-600);
    font-size: 0.875rem;
    margin-top: 1rem;
}

/* Course Filter Section */
.course-filter {
    background-color: var(--bs-dark);
    border-radius: 0.5rem;
    margin-bottom: 2rem;
}

.course-filter .form-label {
    color: var(--bs-light);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.course-filter .form-select,
.course-filter .form-control {
    background-color: var(--bs-gray-800);
    border-color: var(--bs-gray-700);
    color: var(--bs-light);
}

.course-filter .form-select:focus,
.course-filter .form-control:focus {
    background-color: var(--bs-gray-800);
    border-color: var(--bs-primary);
    color: var(--bs-light);
    box-shadow: none;
}

/* Course Categories */
.category-card {
    text-align: center;
    padding: 2rem;
    border-radius: 0.5rem;
    background-color: var(--bs-light);
    transition: transform 0.3s ease;
    opacity: 1;
    transform: translateY(0);
}

.category-card:hover {
    transform: translateY(-5px);
}

.category-card i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--bs-primary);
}

/* Course Details */
.course-header {
    background-color: var(--bs-dark);
    color: var(--bs-light);
    padding: 3rem 0;
    margin-bottom: 2rem;
}

.course-content {
    padding: 2rem 0;
}

.course-sidebar {
    background-color: var(--bs-light);
    border-radius: 0.5rem;
    padding: 1.5rem;
    position: sticky;
    top: 2rem;
}

/* Course Progress */
.progress {
    height: 0.5rem;
    background-color: var(--bs-gray-200);
}

.progress-bar {
    background-color: var(--bs-primary);
}

/* Course Lessons */
.lesson-list {
    list-style: none;
    padding: 0;
}

.lesson-item {
    padding: 1rem;
    border-bottom: 1px solid var(--bs-gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.lesson-item:last-child {
    border-bottom: none;
}

.lesson-item.completed {
    background-color: var(--bs-success-bg-subtle);
}

/* Course Tests */
.test-card {
    background-color: var(--bs-light);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.test-card .test-status {
    font-size: 0.875rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
}

.test-card .test-status.passed {
    background-color: var(--bs-success-bg-subtle);
    color: var(--bs-success);
}

.test-card .test-status.failed {
    background-color: var(--bs-danger-bg-subtle);
    color: var(--bs-danger);
}

/* Animations */
.animate-on-scroll {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-on-scroll.hidden {
    opacity: 0;
    transform: translateY(20px);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .course-card .card-img-top {
        height: 160px;
    }
    
    .course-filter .col-md-3,
    .course-filter .col-md-4 {
        margin-bottom: 1rem;
    }
    
    .course-sidebar {
        position: static;
        margin-top: 2rem;
    }
}