/* 
* بَرْمَجة - Course Page Stylesheet
* Modern Course Display for Educational Platform
*/

:root {
    --course-primary: #3b82f6;
    --course-secondary: #1d4ed8;
    --course-accent: #8b5cf6;
    --course-success: #10b981;
    --course-warning: #f59e0b;
    --course-danger: #ef4444;
    --course-light: #f8fafc;
    --course-dark: #1e293b;
    --course-gray: #64748b;
    --course-border-radius: 14px;
    --course-box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --course-transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
}

/* Course Header */
.course-header {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    padding: 80px 0;
    color: #fff;
    position: relative;
    overflow: hidden;
    border-radius: 0 0 30px 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.course-header::before {
    content: '';
    position: absolute;
    top: -10%;
    right: -5%;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    filter: blur(60px);
}

.course-header::after {
    content: '';
    position: absolute;
    bottom: -10%;
    left: -5%;
    width: 250px;
    height: 250px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    filter: blur(40px);
}

.course-header h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    position: relative;
    color: #fff;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    line-height: 1.3;
}

.course-header h1::after {
    content: '';
    position: absolute;
    bottom: -15px;
    right: 0;
    width: 100px;
    height: 4px;
    background: #fff;
    border-radius: 4px;
    opacity: 0.6;
}

.course-header p.lead {
    font-size: 1.4rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.meta-info {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
    margin-top: 30px;
    font-size: 1.1rem;
}

.meta-info span {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: var(--course-transition);
}

.meta-info span:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
}

.meta-info span i {
    font-size: 1.2rem;
}

/* Course Content Section */
.course-content {
    position: relative;
    z-index: 1;
}

.course-description {
    border-radius: var(--course-border-radius);
    padding: 35px !important;
    background: linear-gradient(145deg, #ffffff, #f8fafc);
    margin-bottom: 40px !important;
    box-shadow: var(--course-box-shadow);
    border-top: 4px solid var(--course-primary);
}

.course-description h2 {
    color: var(--course-dark);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 25px;
    position: relative;
    padding-right: 15px;
}

.course-description h2::before {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: var(--course-primary);
    border-radius: 4px;
}

.course-description p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #475569;
    margin-bottom: 15px;
}

/* Course Cards */
.card {
    border: none;
    border-radius: var(--course-border-radius);
    overflow: hidden;
    transition: var(--course-transition);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    margin-bottom: 30px;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.card-header {
    padding: 20px 25px;
    border: none;
}

.card-header h4 {
    margin: 0;
    font-weight: 700;
    font-size: 1.3rem;
}

.instructor-info {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.instructor-info h5 {
    margin: 0;
    font-weight: 600;
    font-size: 1.1rem;
}

/* Course Lesson List */
.lesson-list {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
}

.lesson-list.show {
    max-height: 1000px;
}

.list-group-item {
    display: flex;
    align-items: center;
    padding: 15px;
    border: none;
    border-radius: 10px !important;
    margin-bottom: 8px;
    background-color: #f8fafc;
    transition: var(--course-transition);
}

.list-group-item:hover {
    background-color: #f1f5f9;
    transform: translateX(-5px);
}

.lesson-thumbnail {
    margin-left: 15px;
    flex-shrink: 0;
}

.lesson-title {
    flex-grow: 1;
    font-weight: 500;
    color: var(--course-dark);
}

.lesson-duration {
    color: var(--course-gray);
    font-size: 0.9rem;
    background: rgba(0, 0, 0, 0.05);
    padding: 5px 10px;
    border-radius: 20px;
    margin-right: 10px;
}

/* Sidebar */
.course-sidebar {
    position: sticky;
    top: 100px;
    width: 100%;
}

.course-sidebar .card {
    width: 100%;
    margin-bottom: 30px;
    transition: none; /* منع التحريك والتأثيرات أثناء التمرير */
    transform: none !important; /* منع أي تأثيرات تحريك */
}

.course-sidebar .card:hover {
    transform: none !important; /* منع تأثير التحويم */
    box-shadow: var(--course-box-shadow); /* الحفاظ على الظل الأصلي */
}

/* إضافة تنسيق جديد للشريط الجانبي الثابت */
.sticky-sidebar-container {
    position: relative;
    height: 100%;
    width: 100%;
}

.related-course {
    padding: 15px;
    border-radius: var(--course-border-radius);
    background: #f8fafc;
    margin-bottom: 15px;
    transition: var(--course-transition);
}

.related-course:hover {
    background: #fff;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    transform: translateY(-5px);
}

.related-course h5 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tags a {
    display: inline-flex;
    align-items: center;
    padding: 8px 15px;
    border-radius: 50px;
    background: #f1f5f9;
    color: var(--course-dark);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--course-transition);
}

.tags a:hover {
    background: var(--course-primary);
    color: #fff;
    transform: translateY(-3px);
}

/* Course Toggle Button */
.toggle-lessons-btn {
    background: transparent;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 50px;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--course-gray);
    transition: var(--course-transition);
    display: flex;
    align-items: center;
    gap: 10px;
}

.toggle-lessons-btn:hover {
    background: rgba(0, 0, 0, 0.03);
    color: var(--course-dark);
}

.toggle-lessons-btn i {
    transition: transform 0.3s ease;
}

.toggle-lessons-btn.expanded i {
    transform: rotate(180deg);
}

/* Start Learning Button */
.start-learning-btn {
    display: block;
    width: 100%;
    padding: 15px 25px;
    background: linear-gradient(135deg, var(--course-primary), var(--course-secondary));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    position: relative;
    overflow: hidden;
    z-index: 1;
    transition: var(--course-transition);
}

.start-learning-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--course-secondary), var(--course-accent));
    z-index: -1;
    opacity: 0;
    transition: var(--course-transition);
}

.start-learning-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
    color: white;
}

.start-learning-btn:hover::before {
    opacity: 1;
}

/* Course Progress Bar */
.progress-container {
    margin: 15px 0;
}

.progress {
    height: 10px;
    border-radius: 10px;
    background-color: #e2e8f0;
}

.progress-bar {
    background: linear-gradient(to right, var(--course-primary), var(--course-accent));
    border-radius: 10px;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    margin-top: 8px;
    color: var(--course-gray);
}

/* Course Features List */
.features-list {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.features-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    font-size: 1rem;
}

.features-list li i {
    color: var(--course-success);
    font-size: 1.1rem;
}

/* Media Queries */
@media (max-width: 991.98px) {
    .course-sidebar {
        position: static;
        margin-top: 40px;
    }
    
    .course-header h1 {
        font-size: 2.5rem;
    }
    
    .meta-info {
        gap: 15px;
    }
}

@media (max-width: 767.98px) {
    .course-header {
        padding: 60px 0;
    }
    
    .course-header h1 {
        font-size: 2rem;
    }
    
    .meta-info {
        flex-direction: column;
        gap: 10px;
    }
    
    .meta-info span {
        width: 100%;
    }
    
    .course-description {
        padding: 25px !important;
    }
}

/* تعديل تنسيق الشريط الجانبي ليكون ثابت الحجم */
@media (min-width: 992px) {
    .course-sidebar {
        width: 100%;
        position: sticky;
        top: 100px;
    }
    
    .course-sidebar .card {
        width: 100% !important;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.8s ease forwards;
}

.fade-in-up {
    animation: fadeInUp 0.8s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}