/* Common styles for inside pages */
.page-header {
    background: linear-gradient(135deg, rgba(88, 28, 135, 0.9) 0%, rgba(59, 130, 246, 0.9) 100%), url('../images/aboutBanner.jpg') center/cover;
    padding: 80px 0;
    text-align: center;
    color: white;
    margin-bottom: 50px;
    border-radius: 0 0 30px 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.course-sidebar {
    background-color: #fff;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    position: sticky;
    top: 20px;
}

/* Custom Scrollbar for Sidebar */
.course-sidebar::-webkit-scrollbar {
    width: 6px;
}
.course-sidebar::-webkit-scrollbar-track {
    background: #f8f9fa;
    border-radius: 4px;
}
.course-sidebar::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}
.course-sidebar::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

.course-sidebar .accordion-button {
    font-size: 1rem;
    padding: 0.8rem 0.5rem;
}

.course-sidebar .accordion-button:not(.collapsed) {
    color: #000;
    background-color: transparent;
    box-shadow: none;
}

.course-sidebar .accordion-button:focus {
    box-shadow: none;
}

.course-sidebar .nav-link {
    font-size: 0.95rem;
    transition: color 0.2s ease-in-out, background-color 0.2s ease-in-out;
    border-radius: 4px;
    padding: 0.5rem 0.75rem;
    display: block;
    text-decoration: none;
}

.course-sidebar .nav-link:hover {
    color: #000 !important;
    background-color: #f8f9fa;
}

.course-sidebar .nav-link.active {
    color: #0d6efd !important;
    font-weight: 600;
    background-color: #e9ecef;
}

/* Sticky sidebar for larger screens */
@media (min-width: 768px) {
    #courseSidebarContainer {
        position: sticky !important;
        top: 100px; /* Offset for navbar */
        height: calc(100vh - 120px);
        overflow-y: auto;
    }
}

/* Custom scrollbar */
#courseSidebarContainer::-webkit-scrollbar {
    width: 6px;
}

#courseSidebarContainer::-webkit-scrollbar-thumb {
    background-color: #ccc;
    border-radius: 10px;
}
#courseSidebarContainer::-webkit-scrollbar-track {
    background-color: #f1f1f1;
}

/* Content section styling */
.content-section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.java-hero {
    background-color: #e9ecef;
    border-radius: 12px;
    padding: 4rem 2rem;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.java-hero::before {
    content: '\f2b3'; /* fa-java icon unicode */
    font-family: "Font Awesome 6 Brands";
    position: absolute;
    font-size: 15rem;
    opacity: 0.05;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}