/*
 * file: modulesAccordion.css (Đã bổ sung thuộc tính tương thích)
 * Cấu trúc chung cho các Modules và Lessons trong accordion
 */
.course-modules h3 {
    font-size: 1.8rem;
    font-weight: var(--heading-font-weight);
    color: var(--current-text-color);
    margin-bottom: 1.5rem;
}

.course-modules .accordion-item:first-of-type {
	border-top-left-radius: 0;
    border-top-right-radius: 0;
}

/*
 * Accordion (Module)
 * Phong cách Card, với hiệu ứng sticky header khi mở
 */
.accordion-item {
    background-color: #ffffff;
    border: none;
    border-radius: 0;
    margin-bottom: 1rem;
    -webkit-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07); /* Tương thích WebKit */
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
    -webkit-transition: box-shadow 0.3s ease, border-color 0.3s ease; /* Tương thích WebKit */
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.accordion-item:last-of-type {
    margin-bottom: 0;
}

.accordion-item:hover {
    -webkit-transform: none; /* Tương thích WebKit */
    transform: none;
    -webkit-box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); /* Tương thích WebKit */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-color: #d8d9e8;
}

/* Header sticky khi item được mở */
/* LƯU Ý: :has() là tính năng rất mới, Firefox chưa hỗ trợ mặc định */
.accordion-item:has(.collapse.show) {
    overflow: visible;
}

.accordion-item:has(.collapse.show) .accordion-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background-color: #ffffff;
    -webkit-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07); /* Tương thích WebKit */
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
}

.accordion-header {
    background-color: transparent;
    border-bottom: none;
    padding: 0;
}

.accordion-button {
    background-color: transparent !important;
    padding: 1rem 1.25rem;
    border: none !important;
    box-shadow: none !important;
    border-radius: 1rem !important;
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    text-align: left;
}

.accordion-button:not(.collapsed) {
    background-color: transparent !important;
    box-shadow: none !important;
    color: initial;
}

.accordion-button:focus {
    outline: 0;
    box-shadow: none !important;
}

/* Icon mũi tên tùy chỉnh cho accordion */
.accordion-button::after {
    background-image: none !important;
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
    content: '\f067'; /* Icon dấu cộng */
    -webkit-transform: none !important; /* Tương thích WebKit */
    transform: none !important;
    font-size: 1rem;
    color: #3d3f76;
    -webkit-transition: all 0.2s ease; /* Tương thích WebKit */
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.accordion-button:not(.collapsed)::after {
    content: '\f068'; /* Icon dấu trừ */
    -webkit-transform: none !important; /* Tương thích WebKit */
    transform: none !important;
}

.accordion-button-content {
    flex-grow: 1;
}

.module-title {
    font-size: 1.05rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 0.35rem;
    line-height: 1.4;
}

.module-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: #6c757d;
}

.module-meta span {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.accordion-body {
    padding: 0.5rem 0;
    background-color: #ffffff;
}

/* LOGIC LỌC VIDEO MIỄN PHÍ */
#modulesAccordion.view-free-only .pro-locked {
    display: none;
}
/* Ẩn các bài học không có video miễn phí nào */
#modulesAccordion.view-free-only .lesson-group:not(:has(.video-item:not(.pro-locked))) {
    display: none;
}
/* Ẩn các module không có bài học miễn phí nào */
#modulesAccordion.view-free-only .accordion-item:not(:has(.lesson-group .video-item:not(.pro-locked))) {
    display: none;
}

/*
 * Nút hành động (Action Buttons)
 * Dạng chip/pill
 */
.module-action-buttons {
    display: flex;
    justify-content: flex-start !important;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.module-action-buttons .btn {
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.4rem 1rem;
    border: 1px solid transparent;
    -webkit-transition: all 0.2s ease; /* Tương thích WebKit */
    transition: all 0.2s ease;
}

.module-action-buttons button {
    background-color: #f0f2f5;
    color: #4f566b;
    border-color: #f0f2f5;
    width: 50%;
    border-radius: unset;
}

.module-action-buttons .btn.btn-outline-primary:hover {
    background-color: #e4e6e9;
    color: #1c1e21;
}

.module-action-buttons .btn.btn-primary {
    color: var(--primary-color);
}

.module-action-buttons .btn.btn-primary:hover {
    color: var(--light-color);
}

/*
 * Các bài học và video (Lesson and Video Items)
 */
.course-modules .lesson-group {
    margin-bottom: 0.75rem;
}

.course-modules .lesson-group:last-child {
    margin-bottom: 0;
}

/* ------------- BỔ SUNG & CHỈNH SỬA TẠI ĐÂY ------------- */

/* Định dạng cho Lesson có nhiều video (giống tiêu đề) */
.lesson-item-group {
    display: flex;
    flex-direction: column;
    padding: 0.75rem;
    border: 1px solid var(--current-border-color);
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--current-text-color);
    background-color: var(--current-bg-color);
    -webkit-transition: all 0.2s ease;
    transition: all 0.2s ease;
    cursor: pointer;
}

.lesson-item-group:hover {
    border-color: var(--primary-color);
    background-color: var(--current-control-section-bg);
    /* Bỏ hiệu ứng nảy */
    -webkit-transform: none;
    transform: none;
}

.lesson-item-group .lesson-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between; /* Đẩy icon sang phải */
    width: 100%;
}

.lesson-item-group .lesson-title-area {
    flex-grow: 1;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.lesson-item-group .lesson-title {
    font-weight: 600;
    font-size: 1rem;
    line-height: 1.4rem;
    margin-bottom: 7px;
    margin-right: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Định dạng cho Video Item (giống nút play) */
.video-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.75rem;
    border: 1px solid var(--current-border-color);
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--current-text-color);
    background-color: var(--current-bg-color);
    -webkit-transition: all 0.2s ease;
    transition: all 0.2s ease;
    cursor: pointer;
}

.video-item:hover {
    border-color: var(--primary-color);
    background-color: var(--current-control-section-bg);
    -webkit-transform: translateY(-2px);
    transform: translateY(-2px);
}

.lesson-videos-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.video-header-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
}

.video-thumbnail-wrapper {
    flex: 0 0 38%;
    max-width: 38%;
}

.video-thumbnail {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: 0.375rem;
    background-color: #e9ecef;
}

.video-title-area {
    flex: 0 0 62%;
    max-width: 62%;
}

.video-title {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--current-text-color);
    line-height: 1.4rem;
    margin-bottom: 7px;
    margin-right: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lesson-info,
.video-details-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--current-secondary-color);
    width: 100%;
    padding: 0.25rem 0.5rem;
    background-color: var(--current-control-section-bg);
    border-radius: 0.25rem;
}

.lesson-info span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.video-details-row {
    justify-content: flex-start;
}

.video-duration-desktop {
    margin-left: 0;
}

.video-info-mobile {
    display: none;
}

/* Trạng thái bài học/video */
.video-item.active-video {
    border-color: var(--primary-color) !important;
    background-color: rgba(var(--primary-color-rgb), 0.1) !important;
}

.lesson-item-group.active-lesson {
    border-color: var(--primary-color) !important;
    background-color: rgba(var(--primary-color-rgb), 0.1) !important;
}

.lesson-item-group.completed-lesson,
.video-item.completed-video {
    opacity: 0.7;
    -webkit-filter: grayscale(50%); /* Tương thích WebKit */
    filter: grayscale(50%);
}

.completed-lesson .lesson-title,
.completed-video .video-title {
    text-decoration-thickness: 1px;
}

.completed-lesson .fa-check-circle,
.completed-video .fa-check-circle {
    color: #28a745 !important;
}

.lesson-item-group.pro-locked,
.video-item.pro-locked {
    /* Không có style đặc biệt */
}

.pro-locked:hover {
    -webkit-transform: none; /* Tương thích WebKit */
    transform: none;
    border-color: var(--current-border-color);
    background-color: var(--current-bg-color);
}

#modulesAccordion.filtered-free-videos .lesson-item-group.pro-locked,
#modulesAccordion.filtered-free-videos .video-item.pro-locked {
    display: none;
}

.lesson-videos-collapsible {
    padding-left: 0.7rem;
    margin-top: 0.5rem;
}

.single-lesson-module {
    padding-left: 0;
}

/*
 * Cấu trúc Sidebar (khi hiển thị)
 */
.playlist-header {
    display: none;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #dee2e6;
    flex-shrink: 0;
}

.learning-playlist-sidebar.show .playlist-header {
    display: flex;
}

/* CSS cho .learning-playlist-sidebar */
.learning-playlist-sidebar {
    display: flex;
    flex-direction: column;
    height: 100%; /* Chiếm toàn bộ chiều cao */
}

/* CSS cho .playlist-inner-wrapper */
.playlist-inner-wrapper {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* CSS cho .playlist-body */
.playlist-body {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    height: calc(100vh - var(--header-height) - 3rem); /* Desktop */
    overflow: hidden; /* Ngăn cuộn ngoài */
}

@media (max-width: 991.98px) {
    .playlist-body {
        max-height: 500px; /* Mobile */
        overflow-y: auto; /* Cho phép cuộn trên mobile nếu cần */
    }
}

/* CSS cho #course-modules-placeholder */
#course-modules-placeholder {
    flex: 1 1 auto;
    max-height: 100%; /* Giới hạn theo .playlist-body */
    overflow: hidden; /* Ngăn cuộn ngoài */
}

/* CSS cho .course-modules */
.course-modules {
    height: 100%; 
    overflow: hidden; 
}

/* CSS cho #modulesAccordion */
#modulesAccordion {
    max-height: 100%; 
    overflow-x: hidden;
    overflow-y: auto !important; 
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--light-color);
}

#modulesAccordion::-webkit-scrollbar {
    width: 8px;
}

#modulesAccordion::-webkit-scrollbar-track {
    background: var(--light-color);
    border-radius: 4px; 
}

#modulesAccordion::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

#modulesAccordion::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

.learning-playlist-sidebar.show .playlist-body {
    height: calc(100% - 55px);
}

#show-all-lessons-videos-btn {
    /* Thuộc tính chung cho cả hai chế độ */
    padding: 0.5rem 1rem;
    font-size: 0.875rem; 
    font-weight: 600;
    border-radius: 0.5rem;
    cursor: pointer;
    text-align: left;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    -webkit-transition: all 0.3s ease;
    transition: all 0.3s ease;
    
    /* Màu sắc và viền mặc định cho chế độ sáng */
    color: var(--dark-color);
    background-color: var(--current-button-light-bg);
    border: 1px solid var(--current-border-color);
}

/* Các thuộc tính thay đổi khi ở chế độ tối */
body.dark-mode #show-all-lessons-videos-btn {
	color: var(--light-color);
    background-color: var(--current-control-section-bg);
    border-color: var(--current-control-section-bg);
}

/* Hiệu ứng khi hover */
#show-all-lessons-videos-btn:hover {
    color: var(--light-color);
    background-color: var(--primary-color); /* Sử dụng biến màu chính */
    border-color: var(--primary-color);
    -webkit-box-shadow: 0 4px 12px rgba(var(--primary-color-rgb), 0.2);
    box-shadow: 0 4px 12px rgba(var(--primary-color-rgb), 0.2); 
    -webkit-transform: translateY(-2px);
    transform: translateY(-2px);
}

/* Màu icon mặc định */
#show-all-lessons-videos-btn i {
    color: var(--primary-color);
    -webkit-transition: color 0.3s ease;
    transition: color 0.3s ease;
}

/* Màu icon khi hover */
#show-all-lessons-videos-btn:hover i {
    color: var(--light-color);
}

/* Responsive */
@media (max-width: 768px) {
    #show-all-lessons-videos-btn {
        font-size: 0.85rem;
        padding: 0.6rem 0.8rem;
    }
}
/*
 * Media Queries
 * Sắp xếp từ màn hình lớn đến màn hình nhỏ
 */
@media (max-width: 991.98px) {
    .lesson-title {
        font-size: 0.95rem;
    }

    .video-title {
        font-size: 0.85rem;
    }
}

@media (max-width: 991.98px) and (orientation: portrait) {
	#modulesAccordion {
        margin-top: -2px;
    }
}

@media (max-width: 991.98px) and (orientation: landscape) {
    #modulesAccordion {
        padding: 10px;
        padding-top: 0px;
    }

    .module-action-buttons {
        margin-top: 10px;
        margin-left: 10px;
        margin-bottom: 0;
    }
}

@media (max-width: 767.98px) {
    .accordion-button {
        padding: 1rem;
    }

    .module-title {
        font-size: 0.9rem;
    }

    .module-meta {
        font-size: 0.75rem;
    }

    .accordion-body {
        padding: 0.5rem;
    }

    .lesson-header-row,
    .video-header-row {
        gap: 0.5rem;
    }

    .lesson-info,
    .video-details-row {
        padding: 0.2rem 0.4rem;
        gap: 0.75rem;
        font-size: 0.8rem;
    }

    .video-info-mobile {
        display: flex;
        width: 100%;
        justify-content: flex-start;
        align-items: center;
        gap: 1rem;
    }

    .lesson-videos-collapsible {
        padding-left: 0;
        border-left: none;
    }
}

/*
 * Các style cho chế độ Dark Mode
 */
body.dark-mode .module-action-buttons .btn.btn-outline-primary {
    background-color: #3a3b3c;
    color: #e4e6eb;
    border-color: #3a3b3c;
}

body.dark-mode .module-action-buttons .btn.btn-outline-primary:hover {
    background-color: #4f5052;
}

body.dark-mode .accordion-item {
    background-color: #242526;
    border-color: #393a3b;
    -webkit-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4); /* Tương thích WebKit */
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

body.dark-mode .accordion-item:has(.collapse.show) .accordion-header {
    background-color: #242526;
    -webkit-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4); /* Tương thích WebKit */
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

body.dark-mode .module-title {
    color: #e4e6eb;
}

body.dark-mode .module-meta {
    color: #b0b3b8;
}

body.dark-mode .accordion-button::after {
    color: #e4e6eb;
}

body.dark-mode .accordion-body {
    background-color: #242526;
    border-top-color: #393a3b;
}

body.dark-mode .lesson-item-group,
body.dark-mode .video-item {
    background-color: #3a3b3c;
    border-color: #4f5052;
    color: #e4e6eb;
}

body.dark-mode .lesson-item-group:hover,
body.dark-mode .video-item:hover {
    background-color: #4f5052;
    border-color: var(--primary-color);
}

body.dark-mode .lesson-title,
body.dark-mode .video-title {
    color: #e4e6eb;
}

body.dark-mode .lesson-info,
body.dark-mode .video-details-row {
    background-color: #242526;
    color: #b0b3b8;
}

body.dark-mode .lesson-videos-collapsible {
    border-left-color: #4f5052;
}

/* ============================================= */
/* === SKELETON LOADER STYLES                  === */
/* ============================================= */
.skeleton-placeholder {
    background-color: var(--current-button-light-bg);
    border-radius: 0.375rem;
    position: relative;
    overflow: hidden;
}

.skeleton-placeholder::after {
    content: '';
    position: absolute;
    top: 0;
    left: -150%;
    width: 150%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: shimmer 1.5s infinite;
}

body.dark-mode .skeleton-placeholder::after {
     background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.08), transparent);
}

@keyframes shimmer {
    0% {
        left: -150%;
    }
    100% {
        left: 150%;
    }
}

.skeleton-lesson {
    height: 60px; /* Chiều cao tương đương một lesson item */
    margin: 0.75rem;
    margin-top: 0;
}

.skeleton-lesson:first-child {
     margin-top: 0.5rem;
}