:root {
	--header-height: 70px;
	--sidebar-width: 400px;
	--primary-color: #0d6efd;
	--main-bg: #f1f3f4;
	--card-radius: 16px;
	--yt-red: #ff0000;
	--yt-dark: #030303;
}

body {
	background-color: var(--main-bg);
	overflow-y: auto;
	overflow-x: hidden;
	height: auto;
	font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
	margin: 0;
}

.navbar-frontend {
	height: var(--header-height);
	background: #fff;
	border-bottom: 1px solid #e0e0e0;
	position: sticky;
	top: 0;
	z-index: 1050;
}

.learning-layout .container {
	max-width: 1600px !important;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

/* --- CỘT TRÁI --- */
.video-section {
	flex: 1;
	min-width: 0;
}

.video-info {
	background: #fff;
	padding: 30px;
	border-radius: var(--card-radius);
	box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
	margin-bottom: 20px;
}

/* --- SKIN CHO VIDEO.JS (YOUTUBE STYLE) --- */
.video-player-container {
	width: 100%;
	border-radius: 12px;
	overflow: hidden;
	background: #000;
	position: relative;
	margin-bottom: 20px;
}

.video-js {
	width: 100% !important;
	height: auto !important;
	aspect-ratio: 16/9;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* ===== NÚT PLAY LỚN GiỮA (YouTube Style) ===== */
.video-js .vjs-big-play-button {
	background: rgba(255, 255, 255, 0.95) !important;
	border: none !important;
	border-radius: 50% !important;
	width: 96px !important;
	height: 96px !important;
	line-height: 96px !important;
	margin-top: -48px !important;
	margin-left: -48px !important;
	font-size: 2.8em !important;
	transition: all 0.2s cubic-bezier(0.4, 0, 1, 1) !important;
	box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3) !important;
	color: var(--yt-red) !important;
	cursor: pointer !important;
}

.video-js:hover .vjs-big-play-button {
	background: rgba(255, 255, 255, 0.98) !important;
	transform: scale(1.05);
	box-shadow: 0 12px 24px rgba(0, 0, 0, 0.4) !important;
}

.video-js.vjs-playing .vjs-big-play-button {
	display: none !important;
}

/* ===== THANH ĐIỀU KHIỂN (Control Bar) ===== */
.video-js .vjs-control-bar {
	background: linear-gradient(to top,
			rgba(0, 0, 0, 1) 0%,
			rgba(0, 0, 0, 0.8) 30%,
			rgba(0, 0, 0, 0.3) 70%,
			rgba(0, 0, 0, 0) 100%) !important;
	height: 65px !important;
	padding: 10px 12px 0 12px !important;
	transition: all 0.3s ease !important;
}

.video-js:hover .vjs-control-bar {
	background: linear-gradient(to top,
			rgba(0, 0, 0, 1) 0%,
			rgba(0, 0, 0, 0.85) 20%,
			rgba(0, 0, 0, 0) 100%) !important;

}

/* ===== THANH TIẾN TRÌNH (Progress Bar) ===== */
.video-js .vjs-progress-control {
	position: absolute !important;
	width: 100% !important;
	height: 4px !important;
	top: -4px !important;
	left: 0 !important;
	padding: 0 !important;
	margin: 0 !important;
}

.video-js .vjs-progress-holder {
	background: rgba(255, 255, 255, 0.3) !important;
	height: 4px !important;
	border-radius: 2px !important;
	top: -4px !important;
}

.video-js .vjs-play-progress {
	background: var(--yt-red) !important;
	box-shadow: 0 0 6px rgba(255, 0, 0, 0.6) !important;
}

.video-js .vjs-play-progress:before {
	background: rgba(255, 255, 255, 0) !important;
	box-shadow: 0 0 4px 2px rgba(255, 0, 0, 0.7) !important;
	width: 12px !important;
	height: 12px !important;
	top: -4px !important;
	border-radius: 50% !important;
	opacity: 0 !important;
	transition: opacity 0.2s ease !important;
}

.video-js .vjs-progress-control:hover .vjs-play-progress:before {
	opacity: 1 !important;
	background: rgba(255, 255, 255, 0.9) !important;
}

.video-js .vjs-progress-control:hover .vjs-progress-holder {
	height: 6px !important;
}

/* ===== CÁC NÚT ĐIỀU KHIỂN (Buttons) ===== */
/* Nút chung */

.vjs-playback-rate .vjs-playback-rate-value {
	line-height: 3.3em;

}

.vjs-icon-play:before,
.video-js .vjs-play-control .vjs-icon-placeholder:before,
.video-js .vjs-big-play-button .vjs-icon-placeholder:before {
	font-size: 2.5em;
}

.vjs-menu-button-popup .vjs-menu .vjs-menu-content {
	overflow: hidden !important;
	max-height: 20em;
}

.video-js .vjs-volume-panel .vjs-volume-control.vjs-volume-horizontal {
	transition: none !important;
	transition: width 0.1s;
	height: 3em;
	margin-right: 0;
}

.video-js .vjs-button {
	cursor: pointer !important;
	transition: all 0.15s ease !important;
	display: flex !important;
	align-items: center !important;
	justify-content: center !important;
	width: 50px !important;
	height: 50px !important;
	padding: 0 !important;
	margin: 0 4px !important;
}

.video-js .vjs-button:hover {
	border-radius: 4px !important;
}

.video-js .vjs-button:active {
	background: rgba(255, 255, 255, 0.2) !important;
}

/* Icon trong nút */
.video-js .vjs-button>.vjs-icon-placeholder:before {
	font-size: 1.6em !important;
	color: #fff !important;
	text-shadow: 0 0 4px rgba(0, 0, 0, 0.5) !important;
}

/* Nút Play/Pause */
.video-js .vjs-play-control {
	order: 0 !important;
	flex: none;
	width: 50px !important;
	height: 50px !important;
	padding: 0 !important;
	margin: 0 4px !important;
	display: flex !important;
	align-items: center !important;
	justify-content: center !important;
}

.video-js .vjs-play-control .vjs-icon-placeholder:before {
	font-size: 1.6em !important;
	line-height: 50px !important;
}

.video-js .vjs-play-control:hover {
	background: rgba(255, 255, 255, 0.15) !important;
	border-radius: 4px !important;
}

/* Volume Control */
/* Volume Control */
.video-js .vjs-volume-panel {
	order: 3 !important;
	display: flex !important;
	align-items: center !important;
	margin: 0 4px !important;
	width: 50px !important;
	/* ← DÒNG NÀY */
	height: 50px !important;
	/* ← VÀ DÒNG NÀY */
	position: relative !important;
	padding-top: 0;
}

.video-js .vjs-volume-control {
	width: auto !important;
}

.video-js .vjs-volume-control.vjs-volume-horizontal {
	width: 50px !important;
}

.video-js .vjs-volume-menu-button.vjs-volume-0~.vjs-volume-control {
	display: none !important;
}

/* Time Display */
.video-js .vjs-time-control {
	display: flex !important;
	align-items: center !important;
	font-size: 13px !important;
	color: #fff !important;
	margin: 0 8px 0 0 !important;
	font-weight: 500 !important;
	font-family: 'Arial', sans-serif !important;
	order: 9;
	padding: 0;
}
.video-js .vjs-time-control.vjs-current-time{
	margin-right: 2px !important;
}

.video-js .vjs-current-time-display:before,
.video-js .vjs-duration-display:before {
	content: '';
	display: none;
}

.video-js .vjs-time-divider {
	padding: 0 4px !important;
	color: #fff !important;
	margin: 0 !important;
	min-width: 10px !important;
}

/* Thứ tự các nút */
.video-js .vjs-prev-button {
	order: 1 !important;
}

.video-js .vjs-next-button {
	order: 2 !important;
}

/* Spacer */
.video-js .vjs-spacer {}

/* Nút Settings/Gear */
.video-js .vjs-playback-rate,
.video-js .vjs-settings-button {
	order: 10 !important;
}

.video-js .vjs-playback-rate .vjs-menu-button-inline .vjs-menu,
.video-js .vjs-settings-button .vjs-menu {
	right: 0 !important;
	left: auto !important;
}

.video-js .vjs-fullscreen-control .vjs-icon-placeholder:before {
	font-size: 3em !important;
}

/* Menu items */
.video-js .vjs-menu {
	background: rgba(28, 28, 28, 0.95) !important;
	border-radius: 4px !important;
	box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4) !important;
	backdrop-filter: blur(10px) !important;
}

.video-js .vjs-menu-item {
	color: #fff !important;
	padding: 10px 16px !important;
	font-size: 14px !important;
	transition: background 0.15s ease !important;
	border-bottom: 1px solid rgba(255, 255, 255, 0.1) !important;
}

.video-js .vjs-menu-item:last-child {
	border-bottom: none !important;
}

.video-js .vjs-menu-item:hover {
	background: rgba(255, 255, 255, 0.15) !important;
}

.video-js .vjs-menu-item.vjs-selected {
	background: rgba(255, 0, 0, 0.3) !important;
	color: var(--yt-red) !important;
	font-weight: 600 !important;
}

/* Fullscreen button */
.video-js .vjs-fullscreen-control {
	order: 11 !important;
	margin-right: 0 !important;
	flex: none;
}
.custom-tabs .nav-link {
	color: #64748b;
	border-radius: 12px;
	padding: 12px;
	transition: all 0.3s ease;
}
.custom-tabs .nav-link.active {
	background-color: #0d6efd !important;
	color: #fff !important;
	box-shadow: 0 4px 12px rgba(13, 110, 253, 0.2);
}
.active-lesson {
	border-left: 4px solid #0d6efd !important;
}
.transition { transition: 0.3s; }
.hover-shadow-sm:hover { box-shadow: 0 4px 8px rgba(0,0,0,0.05); }
.video-js {
	width: 100%;
	border-radius: 0;
}


/* ===== CỘT PHẢI (SIDEBAR) ===== */
.playlist-sidebar {
	width: var(--sidebar-width);
	background: #fff;
	border-radius: var(--card-radius);
	box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
	position: sticky;
	top: calc(var(--header-height) + 20px);
	max-height: calc(100vh - var(--header-height) - 40px);
	display: flex;
	flex-direction: column;
}

.playlist-header {
	padding: 20px;
	border-bottom: 1px solid #f1f1f1;
}

.playlist-body {
	overflow-y: auto;
	padding: 10px;
}

/* Sidebar danh sách bài học bên phải */
.playlist-section {
	flex: 1;
	background-color: #fff;
	border-left: 1px solid #ddd;
	overflow-y: auto;
	max-width: 400px;
}

.chapter-title {
	background-color: #f8f9fa;
	padding: 12px 15px;
	font-weight: bold;
	border-bottom: 1px solid #eee;
	font-size: 0.95rem;
}

.lesson-item {
	display: flex;
	align-items: center;
	padding: 12px 15px;
	cursor: pointer;
	transition: background 0.2s;
	border-bottom: 1px solid #f1f1f1;
	text-decoration: none;
	color: #333;
}

.lesson-item:hover {
	background-color: #e9ecef;
}

.lesson-item.active {
	background-color: #cfe2ff;
	border-left: 4px solid #0d6efd;
}

.lesson-item i {
	margin-right: 10px;
	color: #6c757d;
}

.lesson-info {
	font-size: 0.9rem;
}

.lesson-duration {
	font-size: 0.75rem;
	color: #999;
}

.playlist-body::-webkit-scrollbar {
	width: 6px;
}

.playlist-body::-webkit-scrollbar-track {
	background: #f1f1f1;
	border-radius: 3px;
}

.playlist-body::-webkit-scrollbar-thumb {
	background: #cbd5e1;
	border-radius: 3px;
}

.playlist-body::-webkit-scrollbar-thumb:hover {
	background: #a0aec0;
}

@media (max-width: 992px) {
	.main-container {
		flex-direction: column;
	}

	.playlist-sidebar {
		width: 100%;
		position: static;
		max-height: none;
	}
	.learning-layout .container {
        display: flex;
        flex-direction: column; /* Ép các phần tử xếp thành hàng dọc */
        padding: 0; /* Tối ưu không gian viền trên mobile */
    }

    .video-section {
        width: 100%; /* Video chiếm hết chiều ngang */
        position: relative;
        z-index: 1;
    }

    .playlist-sidebar {
        width: 100%; /* Sidebar chiếm hết chiều ngang */
        margin-top: 20px; /* Tạo khoảng cách với phần thông tin video */
        position: static; /* Hủy bỏ các thuộc tính fixed hoặc absolute nếu có */
        max-height: none; /* Cho phép sidebar giãn theo nội dung bài học */
    }

    .video-player-container {
        border-radius: 0; /* Xóa bo góc để video sát mép màn hình (tùy chọn) */
    }
	.video-info{
		padding: 16px;
	}
}

@media (max-width: 768px) {
    .custom-tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        white-space: nowrap;
        display: flex;
    }
    .custom-tabs .nav-item {
        flex: 0 0 auto;
    }
	.video-info{
		padding: 8px;
	}
	.vjs-volume-control{
		display: none !important;
	}
}

/* Trong file CSS hoặc thẻ <style> */
.lesson-item.locked {
	opacity: 0.6;
	cursor: not-allowed !important;
	background-color: #f8f9fa;
}

.lesson-item.locked:hover {
	background-color: #f8f9fa !important;
	color: inherit !important;
}

.lesson-item.locked i.bi-lock-fill {
	color: #dc3545;
	/* Màu đỏ cho ổ khóa */
}