/* === NEW: Course Page Header Banner === */
.lms-course-header-banner {
    width: 100%;
    height: 350px;
    background-size: cover;
    background-position: center;
    position: relative;
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 40px;
}
.lms-course-header-banner::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.8) 100%);
    z-index: 1;
}
.lms-course-header-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}
.lms-course-header-content h1 {
    font-size: 2.8em;
    font-weight: 700;
    margin: 0;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}
.lms-course-header-author {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}
.lms-course-header-author img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid white;
}
.lms-course-header-author span {
    font-size: 1.1em;
    font-weight: 500;
}

/* === NEW: Lesson/Quiz/Assignment Header === */
.lms-item-header {
    background-color: #fff;
    padding: 20px 40px;
    border-bottom: 1px solid #e5e7eb;
    box-shadow: 0 2px 4px rgba(0,0,0,0.03);
}
.lms-item-header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.lms-item-header h1 {
    font-size: 1.8em;
    font-weight: 600;
    margin: 0;
    color: #1a252f;
}
.lms-item-header .lms-course-link {
    font-size: 0.9em;
    color: #5a6b7b;
    text-decoration: none;
}
.lms-item-header .lms-course-link:hover {
    text-decoration: underline;
}

/* === NEW: Main Content Grid Layout === */
.lms-course-container {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 40px;
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}
.lms-course-main-content {
    background-color: #fff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    border: 1px solid #e5e7eb;
}
.lms-sticky-sidebar {
    position: sticky;
    top: 80px; /* Adjust based on custom header height */
    height: calc(100vh - 100px);
    overflow-y: auto;
}
.lms-sticky-sidebar h3 {
    font-size: 1.3em;
    font-weight: 600;
    color: #1a252f;
    margin: 0 0 15px 0;
}

/* === NEW: Redesigned Curriculum === */
.lms-curriculum-section {
    background: #fff;
    border-radius: 12px;
    margin-bottom: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    border: 1px solid #e5e7eb;
    overflow: hidden;
}
.lms-curriculum-section-header {
    background: #f9fafb;
    padding: 15px 20px;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.lms-curriculum-section-header::after {
    content: '▼';
    font-size: 0.8em;
    transition: transform 0.2s;
}
.lms-curriculum-section-header.is-open::after {
    transform: rotate(180deg);
}
.lms-curriculum-list {
    list-style: none;
    padding: 10px;
    margin: 0;
    display: block; /* Default to open, JS will handle closing */
}
.lms-curriculum-list li {
    display: flex;
    align-items: center;
    padding: 12px 10px;
    border-radius: 6px;
    transition: background-color 0.2s;
    position: relative;
}
.lms-curriculum-list li:not(:last-child) {
    border-bottom: 1px solid #f0f2f5;
}
.lms-curriculum-list li a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    flex-grow: 1;
}
.lms-curriculum-list li .item-icon {
    font-size: 1.2em;
    margin-right: 12px;
    width: 20px;
    text-align: center;
}
.lms-curriculum-list li .item-status-check {
    color: #28a745;
    font-weight: bold;
    font-size: 1.2em;
    margin-left: 10px;
}
.lms-curriculum-list li.current-item {
    background-color: #e0e7ff;
}
.lms-curriculum-list li.current-item a {
    font-weight: 700;
    color: #4338ca;
}
.lms-curriculum-list li.locked {
    opacity: 0.6;
}
.lms-curriculum-list li.locked::after {
    content: '🔒';
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.1em;
}

/* === NEW: Lesson Footer Button === */
.lms-lesson-footer {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e5e7eb;
    text-align: right;
}
#lms-mark-complete-btn {
    background: #28a745;
    color: #fff;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    transition: background-color 0.2s;
}
#lms-mark-complete-btn:hover {
    background: #218838;
}
#lms-mark-complete-btn:disabled {
    background: #6c757d;
    cursor: not-allowed;
    opacity: 0.7;
}

/* === NEW: Styles for Quiz/Assignment in Main Content === */
.lms-quiz-container,
.lms-assignment-container {
    background: #fff;
    padding: 0;
}
.lms-quiz-container header,
.lms-assignment-container header {
    padding-bottom: 15px;
    border-bottom: 1px solid #e5e7eb;
    margin-bottom: 25px;
}
.lms-quiz-container header h1,
.lms-assignment-container header h1 {
    margin: 0;
}

/* === OLD: Archive Page Styles (Kept) === */
.lms-course-archive-container { max-width: 1200px; margin: 2em auto; padding: 0 15px; }
.lms-course-archive-header { background: #fff; padding: 2em; border-radius: 12px; box-shadow: 0 4px 12px rgba(0,0,0,0.05); margin-bottom: 2.5em; text-align: center; }
.lms-course-archive-header h1 { margin: 0; font-size: 2.5em; color: #1a252f; }
.lms-course-archive-header p { font-size: 1.1em; color: #5a6b7b; margin: 10px 0 0; }
.lms-course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 30px; }
.lms-course-card { background: #fff; border-radius: 12px; box-shadow: 0 4px 12px rgba(0,0,0,0.05); overflow: hidden; display: flex; flex-direction: column; transition: transform 0.3s ease, box-shadow 0.3s ease; text-decoration: none; }
.lms-course-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
.lms-course-card .course-card-image { height: 180px; padding: 20px; color: white; display: flex; flex-direction: column; justify-content: flex-end; position: relative; background-size: cover; background-position: center; text-decoration: none; }
.lms-course-card .course-card-image-overlay { position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: linear-gradient(180deg, rgba(0,0,0,0) 20%, rgba(0,0,0,0.8) 100%); z-index: 1; }
.lms-course-card .course-card-image h3 { font-size: 1.5em; color: white; margin: 0; text-shadow: 0 1px 3px rgba(0,0,0,0.5); z-index: 2; position: relative; }
.lms-course-card .course-card-author { display: flex; align-items: center; padding: 10px 20px; border-bottom: 1px solid #f0f0f0; background: #fdfdfd; }
.lms-course-card .course-card-author img { width: 30px; height: 30px; border-radius: 50%; margin-right: 10px; }
.lms-course-card .course-card-author span { font-size: 0.9em; color: #5a6b7b; font-weight: 500; }
.lms-course-card .course-card-body { padding: 20px; flex-grow: 1; }
.lms-course-card .course-card-excerpt { font-size: 0.95em; color: #5a6b7b; line-height: 1.6; height: 80px; overflow: hidden; }
.lms-course-card .course-card-footer { padding: 20px; border-top: 1px solid #f0f0f0; background: #fdfdfd; }
.lms-course-card .course-card-footer .enroll-btn { width: 100%; text-align: center; padding: 10px; }