/*
==============================================
--- Mobile Toggles & Sidebar Styles (TOC.css) ---
==============================================
*/

/* --- Mobile Toggle Bar --- */
.mobile-nav-bar {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    padding-top: 20px;
    /* Add some top padding for better spacing */


    /* MODIFICATION: Make it sticky on mobile */
    position: sticky;
    top: 0;
    background-color: var(--card-background);
    z-index: 100;

}

.mobile-nav-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: 6px;
    transition: background-color 0.2s ease;
}

.mobile-nav-toggle:hover {
    background-color: var(--background-color);
}

.mobile-nav-toggle i {
    transition: transform 0.3s ease;
}

.mobile-sidebar-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 150;
}

.mobile-sidebar-backdrop.is-active {
    display: block;
}

body.sidebar-open {
    overflow: hidden;
}

/* --- Mobile TOC Dropdown --- */
.mobile-toc-container {
    /* Hidden by default */
    max-height: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
    margin-bottom: 1.5rem;
    background-color: #f8f9fa; /* Lighter background for better contrast */
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);            
    /* Add some padding for better spacing */
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.253); /* Subtle shadow for depth */
}

.mobile-toc-container.is-open {
    max-height: 500px;
    overflow-y: scroll;
    /* A sufficiently large value to allow content to expand */
    position: sticky;  /* Make it sticky */
    /* MODIFICATION: Position it below the mobile nav bar */                                                            
    top: 60px;  
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    z-index: 99; /* Ensure it appears above other content */
}

.mobile-toc-container .m-lesson-toc {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
}

/* --- Shared TOC Styles --- */
.m-lesson-toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.m-lesson-toc li {
    margin-bottom: 0.5rem;
}

.m-lesson-toc a {
    display: block;
    text-decoration: none;
    color: var(--text-light);
    font-size: 0.9rem;
    padding: 0.25rem 0;
    transition: all 0.2s ease-in-out;
}

.m-lesson-toc a:hover {
    color: var(--text-dark);
}

.m-lesson-toc a.active {
    color: var(--primary-purple);
    font-weight: 600;
}

.m-lesson-toc ul ul {
    padding-left: 1rem;
    margin-top: 0.5rem;
}


/*
==============================================
--- Responsive Layouts & Sidebars ---
==============================================
*/

/* --- Default Mobile Layout --- */
/* Hide desktop sidebar */
.m-lesson-sidebar-desktop {
    display: none;
}

/* Style the mobile lesson sidebar (off-canvas) */
.course-lesson-sidebar {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 300px;
    background-color: var(--card-background);
    z-index: 200;
    transition: transform 0.3s ease-in-out;
    padding: 2rem;
    overflow-y: auto;
    transform: translateX(-100%);
    /* Start off-screen */
}

.course-lesson-sidebar.is-open {
    transform: translateX(0);
    /* Slide in */
}


/* --- Tablet and Medium Screens (TOC appears on right) --- */
@media (min-width: 992px) {

    .mobile-nav-bar,
    .mobile-toc-container {
        display: none;
        /* Hide all mobile nav elements */
    }

    .course-lesson-sidebar {
        /* Reset sidebar for desktop view - still hidden until large screens */
        display: none;
        position: static;
        transform: none;
        padding: 0;
        background-color: transparent;
        border: none;
        height: auto;
        overflow-y: visible;
    }

    .m-lesson-sidebar-desktop {
        display: block;
        position: sticky;
        top: 100px;
        align-self: start;
        grid-column: 2 / 3;
    }

    .m-lesson-sidebar-desktop .m-lesson-toc {
        max-height: none;
        background-color: transparent;
        border: none;
        padding: 0;
        padding-left: 1.5rem;
        border-left: 2px solid var(--border-color);
    }

    .m-lesson-sidebar-desktop .m-lesson-toc h3 {
        font-size: 0.9rem;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--text-light);
        margin-bottom: 1rem;
        font-weight: 600;
    }

    .m-lesson-sidebar-desktop .m-lesson-toc a {
        border-left: 2px solid transparent;
        padding-left: 1rem;
        margin-left: -1.6rem;
    }

    .m-lesson-sidebar-desktop .m-lesson-toc a.active {
        border-left-color: var(--primary-purple);
        transform: translateX(4px);
    }
}

/* --- Large Desktop Screens (Lesson Sidebar appears on left) --- */
@media (min-width: 1200px) {
    .course-lesson-sidebar {
        display: block;
        position: sticky;
        top: 100px;
        align-self: start;
        grid-column: 1 / 2;
    }

    .course-lesson-nav h4 {
        font-size: 0.9rem;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: var(--text-light);
        margin-bottom: 1rem;
        font-weight: 600;
        padding-bottom: 1rem;
        border-bottom: 1px solid var(--border-color);
    }

    .course-lesson-nav ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .course-lesson-nav a {
        display: block;
        text-decoration: none;
        color: var(--text-light);
        font-size: 0.9rem;
        padding: 0.5rem 0;
        transition: all 0.2s ease-in-out;
    }

    .course-lesson-nav a:hover {
        color: var(--text-dark);
    }

    .course-lesson-nav a.active {
        color: var(--primary-purple);
        font-weight: 600;
    }

    .m-lesson-sidebar-desktop {
        grid-column: 3 / 4;
    }
}


/*
==============================================
--- Course Lesson Sidebar Menu Styles ---
==============================================
*/

/* --- Default Mobile Layout (Off-Canvas Sidebar) --- */
.course-lesson-sidebar {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 300px;
    background-color: var(--card-background);
    z-index: 200;
    transition: transform 0.3s ease-in-out;
    padding: 2rem;
    overflow-y: auto;
    transform: translateX(-100%);
    /* Start off-screen */
}

.course-lesson-sidebar.is-open {
    transform: translateX(0);
    /* Slide in when active */
}

/* --- Shared Navigation Styles --- */
.course-lesson-nav h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-light);
    margin-bottom: 1rem;
    font-weight: 600;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.course-lesson-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.course-lesson-nav a {
    display: block;
    text-decoration: none;
    color: var(--text-light);
    font-size: 0.9rem;
    padding: 0.5rem 0;
    transition: all 0.2s ease-in-out;
}

.course-lesson-nav a:hover {
    color: var(--text-dark);
}

.course-lesson-nav a.active {
    color: var(--primary-purple);
    font-weight: 600;
}


/*
==============================================
--- Responsive Desktop Layouts ---
==============================================
*/

/* --- Hide the sidebar on medium screens --- */
@media (min-width: 992px) {
    .course-lesson-sidebar {
        display: none;
        /* Hide between 992px and 1199px */
        position: static;
        transform: none;
        padding: 0;
        background-color: transparent;
        border: none;
        height: auto;
        overflow-y: visible;
    }
}

/* --- Show sidebar on large desktop screens --- */
@media (min-width: 1200px) {
    .course-lesson-sidebar {
        display: block;
        position: sticky;
        top: 100px;
        align-self: start;
        grid-column: 1 / 2;
        /* Position in the first column */
    }
}