/* === SIDEBARS V3 === */

/* 1. BASE SIDEBAR STYLE */
.sidebar {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-medium);
    padding: 1.5rem;
    z-index: 1002;
}

/* 2. ENROLLMENT SIDEBAR */
.enrollment-sidebar {
    position: fixed;
    top: 80px;
    right: -340px; /* Hidden off-screen */
    width: 320px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    border-radius: var(--border-radius-soft) 0 0 var(--border-radius-soft);
    border-right: none;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.enrollment-sidebar.is-visible {
    right: 0;
}
.enrollment-sidebar h3 {
    color: var(--color-danger);
    font-size: 1.2rem;
    margin: 0 0 1rem 0;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.75rem;
}
.enrollment-sidebar p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

/* Toggle Button */
#toggleEnrollmentSidebarBtn {
    position: fixed;
    top: 120px;
    right: 0;
    z-index: 1001;
    background-color: var(--color-primary);
    color: white;
    border: none;
    padding: 0.75rem;
    border-radius: var(--border-radius-hard) 0 0 var(--border-radius-hard);
    cursor: pointer;
    box-shadow: var(--shadow-medium);
    transition: var(--transition-smooth);
    writing-mode: vertical-rl;
    text-orientation: mixed;
}
#toggleEnrollmentSidebarBtn:hover {
    background-color: var(--color-primary-dark);
}

/* Close Button */
.close-sidebar-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.75rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-secondary);
    cursor: pointer;
    opacity: 0.7;
}
.close-sidebar-btn:hover {
    opacity: 1;
    color: var(--color-danger);
}

/* 3. TABLE OF CONTENTS (TOC) SIDEBAR */
#toc-sidebar {
    position: sticky;
    top: 100px; /* Sticky position for desktop */
    width: 250px;
    border-radius: var(--border-radius-soft);
}
#toc-sidebar h3 {
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    margin: 0 0 1rem 0;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
}
#toc-sidebar nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
#toc-sidebar nav ul li a {
    display: block;
    padding: 0.6rem 1rem;
    color: var(--color-text-secondary);
    border-radius: var(--border-radius-hard);
    font-weight: 500;
    font-size: 0.9rem;
    border-left: 3px solid transparent;
}
#toc-sidebar nav ul li a:hover {
    background-color: var(--color-surface-soft);
    color: var(--color-text-primary);
}
#toc-sidebar nav ul li a.toc-active {
    background-color: hsl(210, 100%, 50%, 0.08);
    color: var(--color-primary);
    font-weight: 600;
    border-left-color: var(--color-primary);
}

/* css/components/sidebars.css */

/* Table of Contents (TOC) Sidebar */
#toc-sidebar {
    position: sticky;
    top: 90px; /* Vị trí dính lại khi cuộn */
    width: 250px;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-soft);
    padding: 1.5rem;
    box-shadow: var(--shadow-subtle);
}

#toc-sidebar h3 {
    margin: 0 0 1rem 0;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-border);
}

#toc-sidebar nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#toc-sidebar nav ul li a {
    display: block;
    padding: 0.6rem 1rem;
    color: var(--color-text-secondary);
    border-radius: var(--border-radius-hard);
    font-weight: 500;
    font-size: 0.9rem;
    border-left: 3px solid transparent;
    transition: var(--transition-smooth);
}

#toc-sidebar nav ul li a:hover {
    background-color: var(--color-surface-soft);
    color: var(--color-text-primary);
}

#toc-sidebar nav ul li a.toc-active {
    background-color: hsla(210, 100%, 50%, 0.08);
    color: var(--color-primary);
    font-weight: 600;
    border-left-color: var(--color-primary);
}

/* Responsive for TOC */
@media (max-width: 1024px) {
    #toc-sidebar {
        display: none; /* Ẩn sidebar trên mobile, cần JS để hiện lại nếu muốn */
    }
}