/**
 * List Course Page Styles - Free Courses Page
 * Sử dụng color palette từ site.css và components.css
 * Updated to match default brand colors (Primary Blue)
 */

/* ====================================
   PAGE HEADER SECTION
   ==================================== */

.free-courses-header {
	background: linear-gradient(135deg, 
		var(--primary-color) 0%, 
		var(--primary-light) 50%,
		var(--primary-lighter) 100%
	);
	padding: 5rem 0 4rem;
	position: relative;
	overflow: hidden;
	color: var(--text-white);
}

.free-courses-header::before {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background-image: 
		radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
		radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
	opacity: 0.6;
	pointer-events: none;
}

.free-courses-header::after {
/*	content: "";
*/	position: absolute;
	bottom: 0;
	left: 0;
	width: 100%;
	height: 100px;
	background: linear-gradient(to bottom, transparent, var(--bg-white));
}

.free-courses-header h1 {
	color: var(--text-white);
	font-size: 3rem;
	font-weight: 700;
	margin-bottom: 1rem;
	text-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
	position: relative;
	z-index: 1;
	animation: fadeInDown 0.8s ease-out;
}

.free-courses-header .lead {
	font-size: 1.2rem;
	opacity: 0.95;
	max-width: 800px;
	margin: 0 auto;
	line-height: 1.8;
	position: relative;
	z-index: 1;
	animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.free-badge-large {
	display: inline-block;
	background: linear-gradient(135deg, #fff, rgba(255, 255, 255, 0.9));
	color: var(--success-color);
	padding: 0.75rem 2rem;
	border-radius: 50px;
	font-size: 1.4rem;
	font-weight: 700;
	margin-bottom: 2rem;
	box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
	position: relative;
	z-index: 1;
	animation: bounceIn 1s ease-out 0.4s backwards;
	letter-spacing: 1px;
}

.free-badge-large i {
	animation: pulse 2s ease-in-out infinite;
}

/* Variant for All Courses page */
.page-courses-all .free-badge-large {
	color: var(--primary-color);
}

.page-courses-all .free-courses-header {
	background: linear-gradient(135deg, 
		var(--premium-color) 0%, 
		var(--primary-color) 50%,
		var(--secondary-color) 100%
	);
}

/* Variant for Sale Courses page - NEW */
.page-courses-sale .free-badge-large.sale-badge {
	color: var(--danger-color);
}

.page-courses-sale .free-courses-header {
	background: linear-gradient(135deg, 
		var(--danger-color) 0%, 
		#dc2626 50%,
		#f97316 100%
	);
}

/* Page Navigation Links - NEW */
.page-links {
	display: flex;
	gap: 1rem;
	justify-content: center;
	align-items: center;
	flex-wrap: wrap;
}

.page-links .btn {
	transition: all var(--transition-speed);
}

.page-links .btn:hover {
	transform: translateY(-2px);
	box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Related Links Section - NEW */
.related-links-section {
	margin-top: 4rem;
}

.related-link-card {
	background: linear-gradient(135deg, 
		var(--bg-white) 0%, 
		var(--bg-light) 100%
	);
	border: 2px solid var(--border-light);
	border-radius: var(--border-radius-xl);
	padding: 2rem;
	height: 100%;
	display: flex;
	flex-direction: column;
	gap: 1rem;
	transition: all var(--transition-speed);
	position: relative;
	overflow: hidden;
}

.related-link-card::before {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 4px;
	background: linear-gradient(90deg, 
		var(--primary-color), 
		var(--primary-light)
	);
	transform: scaleX(0);
	transform-origin: left;
	transition: transform 0.4s ease;
}

.related-link-card:hover::before {
	transform: scaleX(1);
}

.related-link-card:hover {
	transform: translateY(-8px);
	box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
	border-color: var(--primary-color);
}

.related-link-card .card-icon {
	width: 64px;
	height: 64px;
	background: linear-gradient(135deg, 
		var(--primary-color), 
		var(--primary-light)
	);
	border-radius: var(--border-radius-xl);
	display: flex;
	align-items: center;
	justify-content: center;
	color: white;
	font-size: 2rem;
	box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
	transition: all var(--transition-speed);
}

.related-link-card:hover .card-icon {
	transform: scale(1.1) rotate(5deg);
}

.related-link-card h3 {
	font-size: 1.5rem;
	font-weight: 700;
	color: var(--text-dark);
	margin: 0;
}

.related-link-card p {
	color: var(--text-medium);
	line-height: 1.6;
	margin: 0;
	flex: 1;
}

.related-link-card .btn {
	align-self: flex-start;
	transition: all var(--transition-speed);
}

.related-link-card .btn:hover {
	transform: translateX(8px);
}

/* Sale course specific styles - Icon color variants */
.related-link-card:nth-child(2) .card-icon {
	background: linear-gradient(135deg, 
		var(--success-color), 
		var(--secondary-color)
	);
	box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.related-link-card:nth-child(3) .card-icon {
	background: linear-gradient(135deg, 
		var(--danger-color), 
		#dc2626
	);
	box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* Responsive for related links */
@media (max-width: 767px) {
	.related-links-section {
		margin-top: 3rem;
	}
	
	.related-link-card {
		padding: 1.5rem;
	}
	
	.related-link-card .card-icon {
		width: 48px;
		height: 48px;
		font-size: 1.5rem;
	}
	
	.related-link-card h3 {
		font-size: 1.25rem;
	}
}

/* ====================================
   FILTER & SEARCH SECTION
   ==================================== */

.filter-section {
	background: linear-gradient(to bottom, var(--bg-white), var(--bg-light));
	border-radius: var(--border-radius-xl);
	box-shadow: 
		0 4px 6px rgba(0, 0, 0, 0.05),
		0 10px 20px rgba(0, 0, 0, 0.05);
	padding: 2rem;
	margin-bottom: 2.5rem;
	border: 2px solid var(--border-light);
	position: relative;
	overflow: hidden;
}

.filter-section::before {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 4px;
	background: linear-gradient(90deg, 
		var(--primary-color), 
		var(--primary-light)
	);
}

.filter-section .form-label {
	font-weight: 600;
	color: var(--text-dark);
	margin-bottom: 0.75rem;
	font-size: 0.95rem;
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

.filter-section .form-label i {
	color: var(--primary-color);
}

.filter-section .form-control,
.filter-section .form-select {
	border: 2px solid var(--border-light);
	border-radius: var(--border-radius-lg);
	padding: 0.75rem 1.25rem;
	transition: all var(--transition-speed);
	background-color: var(--bg-white);
	font-size: 0.95rem;
}

.filter-section .form-control:hover,
.filter-section .form-select:hover {
	border-color: var(--border-dark);
}

.filter-section .form-control:focus,
.filter-section .form-select:focus {
	border-color: var(--primary-color);
	box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
	outline: none;
	background-color: var(--bg-white);
}

.filter-section .btn-primary {
	padding: 0.75rem 2.5rem;
	font-weight: 600;
	border-radius: var(--border-radius-lg);
	box-shadow: var(--box-shadow-sm);
}

.filter-section .btn-primary:hover {
	transform: translateY(-2px);
	box-shadow: var(--box-shadow-md);
}

.filter-section .btn-outline-secondary {
	padding: 0.75rem 1.5rem;
	border-radius: var(--border-radius-lg);
	border-width: 2px;
}

/* ====================================
   COURSE CARDS GRID
   ==================================== */

.courses-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
	gap: 2.5rem;
	margin-bottom: 3rem;
}

@media (max-width: 767px) {
	.courses-grid {
		grid-template-columns: 1fr;
		gap: 2rem;
	}
}

/* ====================================
   FREE COURSE CARD - ENHANCED WITH PRIMARY COLORS
   ==================================== */

.free-course-card {
	background-color: var(--bg-white);
	border-radius: var(--border-radius-xl);
	overflow: hidden;
	box-shadow: 
		0 2px 8px rgba(0, 0, 0, 0.08),
		0 4px 16px rgba(0, 0, 0, 0.05);
	transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
	border: 2px solid transparent;
	height: 100%;
	display: flex;
	flex-direction: column;
	position: relative;
	animation: fadeInUp 0.6s ease-out backwards;
}

.free-course-card:nth-child(1) { animation-delay: 0.1s; }
.free-course-card:nth-child(2) { animation-delay: 0.2s; }
.free-course-card:nth-child(3) { animation-delay: 0.3s; }
.free-course-card:nth-child(4) { animation-delay: 0.4s; }
.free-course-card:nth-child(5) { animation-delay: 0.5s; }
.free-course-card:nth-child(6) { animation-delay: 0.6s; }

.free-course-card::before {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 4px;
	background: linear-gradient(90deg, 
		var(--primary-color), 
		var(--primary-light)
	);
	transform: scaleX(0);
	transform-origin: left;
	transition: transform 0.4s ease;
}

.free-course-card:hover::before {
	transform: scaleX(1);
}

.free-course-card:hover {
	transform: translateY(-12px) scale(1.02);
	box-shadow: 
		0 12px 24px rgba(37, 99, 235, 0.15),
		0 20px 40px rgba(0, 0, 0, 0.1);
	border-color: var(--primary-color);
}

/* Course Image Container */
.course-image-container {
	position: relative;
	overflow: hidden;
	height: 220px;
	background: linear-gradient(135deg, var(--bg-light), var(--bg-lighter));
}

.course-image-container::after {
	content: "";
	position: absolute;
	inset: 0;
	background: linear-gradient(to bottom, 
		transparent 0%, 
		transparent 50%,
		rgba(0, 0, 0, 0.4) 100%
	);
	opacity: 0;
	transition: opacity var(--transition-speed);
}

.free-course-card:hover .course-image-container::after {
	opacity: 1;
}

.course-image-container img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.free-course-card:hover .course-image-container img {
	transform: scale(1.15) rotate(2deg);
}

/* Free Badge */
.course-free-badge {
	position: absolute;
	top: 16px;
	left: 16px;
	background: linear-gradient(135deg, 
		var(--success-color), 
		var(--secondary-color)
	);
	color: white;
	padding: 0.5rem 1.25rem;
	border-radius: 50px;
	font-size: 0.9rem;
	font-weight: 700;
	box-shadow: 
		0 4px 12px rgba(16, 185, 129, 0.3),
		0 2px 6px rgba(0, 0, 0, 0.2);
	z-index: 3;
	display: flex;
	align-items: center;
	gap: 0.4rem;
	animation: slideInLeft 0.5s ease-out;
	letter-spacing: 0.5px;
}

.course-free-badge::before {
	content: "";
	position: absolute;
	inset: 0;
	border-radius: 50px;
	background: linear-gradient(135deg, 
		rgba(255, 255, 255, 0.3), 
		transparent
	);
	opacity: 0;
	transition: opacity var(--transition-speed);
}

.free-course-card:hover .course-free-badge::before {
	opacity: 1;
}

.course-free-badge i {
	font-size: 1.1rem;
	animation: rotate 3s ease-in-out infinite;
}

/* Discount Badge */
.course-discount-badge {
	position: absolute;
	top: 16px;
	left: 16px;
	background: linear-gradient(135deg, 
		var(--danger-color), 
		#dc2626
	);
	color: white;
	padding: 0.5rem 1.25rem;
	border-radius: 50px;
	font-size: 0.9rem;
	font-weight: 700;
	box-shadow: 
		0 4px 12px rgba(239, 68, 68, 0.3),
		0 2px 6px rgba(0, 0, 0, 0.2);
	z-index: 3;
	display: flex;
	align-items: center;
	gap: 0.4rem;
	animation: slideInLeft 0.5s ease-out;
	letter-spacing: 0.5px;
}

.course-discount-badge::before {
	content: "";
	position: absolute;
	inset: 0;
	border-radius: 50px;
	background: linear-gradient(135deg, 
		rgba(255, 255, 255, 0.3), 
		transparent
	);
	opacity: 0;
	transition: opacity var(--transition-speed);
}

.free-course-card:hover .course-discount-badge::before {
	opacity: 1;
}

.course-discount-badge i {
	font-size: 1.1rem;
	animation: pulse 2s ease-in-out infinite;
}

/* Provider Badge - NEW */
.course-provider-badge {
	position: absolute;
	bottom: 12px;
	right: 12px;
	background: rgba(255, 255, 255, 0.95);
	backdrop-filter: blur(10px);
	color: var(--text-dark);
	padding: 0.4rem 1rem;
	border-radius: 20px;
	font-size: 0.75rem;
	font-weight: 600;
	box-shadow: 
		0 2px 8px rgba(0, 0, 0, 0.15),
		0 1px 3px rgba(0, 0, 0, 0.1);
	z-index: 2;
	letter-spacing: 0.3px;
	border: 1px solid rgba(37, 99, 235, 0.2);
	transition: all var(--transition-speed);
}

.free-course-card:hover .course-provider-badge {
	background: var(--primary-color);
	color: white;
	border-color: var(--primary-color);
	transform: translateY(-2px);
}

/* Course Card Body - NEW */
.course-card-body {
	padding: 1.5rem;
	flex: 1;
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

/* Course Category - NEW */
.course-category {
	font-size: 0.75rem;
	font-weight: 600;
	color: var(--primary-color);
	text-transform: uppercase;
	letter-spacing: 0.5px;
	display: inline-flex;
	align-items: center;
}

/* Course Title */
.course-title {
	font-size: 1.1rem;
	font-weight: 600;
	line-height: 1.4;
	margin: 0;
	color: var(--text-dark);
}

.course-title a {
	color: inherit;
	text-decoration: none;
	transition: color var(--transition-speed);
}

.course-title a:hover {
	color: var(--primary-color);
}

/* Course Description - NEW */
.course-description {
	font-size: 0.875rem;
	color: var(--text-medium);
	line-height: 1.6;
	display: -webkit-box;
	-webkit-line-clamp: 2;
	-webkit-box-orient: vertical;
	overflow: hidden;
	margin: 0;
}

/* Course Meta - NEW */
.course-meta {
	display: flex;
	flex-wrap: wrap;
	gap: 1rem;
	font-size: 0.8rem;
	color: var(--text-light);
}

.course-meta-item {
	display: flex;
	align-items: center;
	gap: 0.4rem;
}

.course-meta-item i {
	color: var(--primary-color);
	font-size: 0.9rem;
}

/* Course Card Footer - NEW */
.course-card-footer {
	padding: 1rem 1.5rem 1.5rem;
	border-top: 1px solid var(--border-light);
	margin-top: auto;
}

/* Course Stats - NEW */
.course-stats {
	display: flex;
	align-items: center;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 0.75rem;
	margin-bottom: 1rem;
}

/* Course Rating - NEW */
.course-rating {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	font-size: 0.875rem;
}

.rating-stars {
	display: flex;
	gap: 0.2rem;
	color: var(--warning-color);
}

.rating-count {
	color: var(--text-muted);
	font-size: 0.8rem;
}

/* Course Students - NEW */
.course-students {
	display: flex;
	align-items: center;
	gap: 0.4rem;
	font-size: 0.8rem;
	color: var(--text-light);
}

.course-students i {
	color: var(--primary-color);
}

/* Course Actions - NEW */
.course-actions {
	display: flex;
	gap: 0.75rem;
	margin-top: 1rem;
}

.btn-view-course {
	flex: 1;
	background: var(--primary-color);
	color: white;
	border: none;
	padding: 0.75rem 1.5rem;
	border-radius: var(--border-radius);
	font-weight: 600;
	font-size: 0.875rem;
	transition: all var(--transition-speed);
	text-decoration: none;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
}

.btn-view-course:hover {
	background: var(--primary-hover);
	transform: translateY(-2px);
	box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-save-course {
	background: white;
	color: var(--text-dark);
	border: 2px solid var(--border-light);
	padding: 0.75rem 1rem;
	border-radius: var(--border-radius);
	font-size: 1.1rem;
	transition: all var(--transition-speed);
	cursor: pointer;
}

.btn-save-course:hover {
	border-color: var(--primary-color);
	color: var(--primary-color);
	background: rgba(37, 99, 235, 0.05);
}

.btn-save-course.saved {
	background: var(--primary-color);
	color: white;
	border-color: var(--primary-color);
}

/* Animations */
@keyframes rotate {
	0%, 100% {
		transform: rotate(0deg);
	}
	25% {
		transform: rotate(15deg);
	}
	75% {
		transform: rotate(-15deg);
	}
}

@keyframes slideInLeft {
	from {
		opacity: 0;
		transform: translateX(-20px);
	}
	to {
		opacity: 1;
		transform: translateX(0);
	}
}

/* Results Info */
.results-info {
	display: flex;
	justify-content: space-between;
	align-items: center;
	margin-bottom: 2rem;
	padding: 1rem 1.5rem;
	background: var(--bg-light);
	border-radius: var(--border-radius);
}

.results-count {
	font-size: 1rem;
	color: var(--text-dark);
	font-weight: 500;
}

.count-number {
	font-weight: 700;
	color: var(--primary-color);
	font-size: 1.2rem;
}

/* View Toggle */
.view-toggle {
	display: flex;
	gap: 0.5rem;
}

.view-toggle .btn {
	padding: 0.5rem 1rem;
	border: 2px solid var(--border-light);
	background: white;
	color: var(--text-medium);
	border-radius: var(--border-radius);
	transition: all var(--transition-speed);
}

.view-toggle .btn.active {
	background: var(--primary-color);
	color: white;
	border-color: var(--primary-color);
}

.view-toggle .btn:hover:not(.active) {
	border-color: var(--primary-color);
	color: var(--primary-color);
}

/* Pagination */
.courses-pagination {
	margin-top: 3rem;
}

.courses-pagination .pagination {
	justify-content: center;
	gap: 0.5rem;
}

.courses-pagination .page-link {
	border: 2px solid var(--border-light);
	color: var(--text-dark);
	border-radius: var(--border-radius);
	padding: 0.75rem 1.25rem;
	transition: all var(--transition-speed);
	font-weight: 500;
}

.courses-pagination .page-link:hover {
	border-color: var(--primary-color);
	background: var(--primary-color);
	color: white;
}

.courses-pagination .page-item.active .page-link {
	background: var(--primary-color);
	border-color: var(--primary-color);
}

.courses-pagination .page-item.disabled .page-link {
	background: var(--bg-lighter);
	border-color: var(--border-light);
	color: var(--text-muted);
}

/* Empty State */
.empty-state {
	text-align: center;
	padding: 4rem 2rem;
}

.empty-state i {
	font-size: 4rem;
	color: var(--text-muted);
	margin-bottom: 1.5rem;
}

.empty-state h3 {
	color: var(--text-dark);
	margin-bottom: 1rem;
}

.empty-state p {
	color: var(--text-medium);
	max-width: 600px;
	margin: 0 auto 2rem;
}

/* Loading Skeleton */
.loading-skeleton {
	background: linear-gradient(90deg, 
		var(--bg-light) 0%, 
		var(--bg-lighter) 50%, 
		var(--bg-light) 100%
	);
	background-size: 200% 100%;
	animation: shimmer 1.5s ease-in-out infinite;
	border-radius: var(--border-radius-lg);
}

@keyframes shimmer {
	0% { background-position: -200% 0; }
	100% { background-position: 200% 0; }
}

/* Responsive */
@media (max-width: 991px) {
	.free-courses-header {
		padding: 3rem 0 2rem;
	}
	
	.free-courses-header h1 {
		font-size: 2rem;
	}
	
	.courses-grid {
		gap: 2rem;
	}
}

@media (max-width: 767px) {
	.filter-section {
		padding: 1.5rem;
	}
	
	.results-info {
		flex-direction: column;
		gap: 1rem;
	}
	
	.course-card-body {
		padding: 1.25rem;
	}
	
	.course-actions {
		flex-direction: column;
	}
	
	.btn-save-course {
		width: 100%;
	}
}