/* Global background */
body {
    background-color: rgb(33, 53, 85);
    font-family: Arial, sans-serif;
}

/* Sidebar */
.sidebar {
    width: 200px;
    min-height: 100vh;
    background-color: rgb(11, 29, 58);
    position: fixed;
    top: 0;
    left: 0;
    border-top-right-radius: 20px;
    border-bottom-right-radius: 20px;
}

.sidebar .nav {
    margin-top: 100px;
    padding-left: 20px;
}


.sidebar .nav-link {
    color: #ffffff;
    padding: 12px 20px;
    display: block;
}

.sidebar .nav-link.active,
.sidebar .nav-link:hover {
    background-color: #1b2836;
    color: #fff;
    border-radius: 4px;
}

/* Main content shifts right */
.content {
    margin-left: 200px;
}

/* Buttons */
.btn-dark {
    background-color: rgb(11, 29, 58);
    border: none;
    border-radius: 8px;
    padding: 10px;
    font-weight: 600;
}

/* Course thumbnail inside buttons */
.btn-dark .course-thumb {
    width: 100%;
    height: 120px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 8px;
    display: block;
}

.btn-dark strong {
    font-size: 1rem;
    /* course name */
    color: #fff;
}

.btn-dark small {
    font-size: 0.8rem;
    color: #ccc;
    padding-top: 20px;
}


.btn-dark:hover {
    background-color: #1b2836;
}

/* Responsive fix: sidebar shrinks */
@media (max-width: 768px) {
    .sidebar {
        width: 150px;
    }

    .content {
        margin-left: 150px;
    }
}

@media (max-width: 576px) {
    .sidebar {
        width: 130px;
        padding-top: 20px;
    }

    .content {
        margin-left: 130px;
        padding: 10px;
    }

    .row > .col-6 {
        flex: 0 0 100%;
        max-width: 100%;
    }

    .btn-dark {
        padding: 12px;
        font-size: 0.9rem;
    }

    .btn-dark .course-thumb {
        height: 140px;
    }

    .btn-dark strong {
        font-size: 1rem;
    }

    .btn-dark small {
        font-size: 0.75rem;
        padding-top: 10px;
    }

}