/* =============================================
   COURSE PAGE STYLES - Modern Design
   ============================================= */

/* Course Hero Section */
.course-hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 60px 0;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
}

.course-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="2"/></svg>');
    background-size: 100px;
    opacity: 0.3;
}

.course-hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: #fff;
}

.course-hero-icon {
    width: 80px;
    height: 80px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    backdrop-filter: blur(10px);
}

.course-hero-icon i {
    font-size: 36px;
    color: #fff;
}

.course-hero h1 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.course-hero p {
    font-size: 18px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Course Main Container */
.course-container {
    padding: 40px 0;
}

/* Side Menu */
.course-sidebar {
    position: sticky;
    top: 100px;
}

.course-menu {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    overflow: hidden;
}

.course-menu-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 20px;
    text-align: center;
}

.course-menu-header h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
}

.course-menu-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.course-menu-list li {
    border-bottom: 1px solid #f0f0f0;
}

.course-menu-list li:last-child {
    border-bottom: none;
}

.course-menu-list li a,
.course-menu-list li span {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    color: #555;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 14px;
}

.course-menu-list li a:hover {
    background: linear-gradient(135deg, rgba(102,126,234,0.1) 0%, rgba(118,75,162,0.1) 100%);
    color: #667eea;
    padding-left: 25px;
}

.course-menu-list li a i,
.course-menu-list li span i {
    margin-right: 12px;
    width: 20px;
    text-align: center;
    color: #667eea;
}

.course-menu-list li.active a {
    background: linear-gradient(135deg, rgba(102,126,234,0.15) 0%, rgba(118,75,162,0.15) 100%);
    color: #667eea;
    font-weight: 600;
    border-left: 4px solid #667eea;
}

/* Course Content Cards */
.course-content {
    padding-left: 30px;
}

.course-card {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
    margin-bottom: 25px;
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid rgba(0,0,0,0.05);
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.12);
}

.course-card-header {
    padding: 20px 25px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #f5f5f5;
}

.course-card-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
}

.course-card-icon i {
    font-size: 22px;
    color: #fff;
}

.course-card-icon.blue { background: linear-gradient(135deg, #3498db, #2980b9); }
.course-card-icon.green { background: linear-gradient(135deg, #27ae60, #1e8449); }
.course-card-icon.purple { background: linear-gradient(135deg, #9b59b6, #8e44ad); }
.course-card-icon.orange { background: linear-gradient(135deg, #e67e22, #d35400); }
.course-card-icon.red { background: linear-gradient(135deg, #e74c3c, #c0392b); }
.course-card-icon.teal { background: linear-gradient(135deg, #1abc9c, #16a085); }

.course-card-header h4 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    color: #2c3e50;
}

.course-card-body {
    padding: 25px;
    min-height: 80px;
}

.course-card-body p {
    margin: 0;
    color: #666;
    line-height: 1.8;
}

.course-card-body .placeholder-text {
    color: #bbb;
    font-style: italic;
    text-align: center;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 10px;
    border: 2px dashed #e0e0e0;
}

/* Quick Info Section */
.course-quick-info {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
    padding: 30px;
    margin-bottom: 30px;
}

.quick-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
}

.quick-info-item {
    display: flex;
    align-items: center;
    padding: 15px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.quick-info-item:hover {
    transform: scale(1.02);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.quick-info-icon {
    width: 45px;
    height: 45px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
}

.quick-info-icon i {
    font-size: 18px;
    color: #fff;
}

.quick-info-content h5 {
    margin: 0 0 5px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #999;
}

.quick-info-content p {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: #2c3e50;
}

/* CTA Section */
.course-cta {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    color: #fff;
    margin-top: 30px;
}

.course-cta h3 {
    margin: 0 0 15px;
    font-size: 24px;
}

.course-cta p {
    margin: 0 0 25px;
    opacity: 0.9;
}

.course-cta .btn-cta {
    background: #fff;
    color: #667eea;
    padding: 15px 40px;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
}

.course-cta .btn-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

/* Responsive */
@media (max-width: 991px) {
    .course-content {
        padding-left: 0;
        margin-top: 30px;
    }
    
    .course-sidebar {
        position: relative;
        top: 0;
    }
    
    .course-hero h1 {
        font-size: 26px;
    }
}

@media (max-width: 767px) {
    .course-hero {
        padding: 40px 0;
    }
    
    .course-hero h1 {
        font-size: 22px;
    }
    
    .quick-info-grid {
        grid-template-columns: 1fr;
    }
}