/* Course Header */
.course-header {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #4a6ee0 0%, #6c5ce7 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.course-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
}

.course-header-content {
    flex: 1;
    min-width: 300px;
}

.course-header h1 {
    font-size: 2.8rem;
    margin: 15px 0 20px;
    line-height: 1.2;
    color: white;
}

.course-intro {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.course-meta span {
    display: flex;
    align-items: center;
    font-size: 0.95rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.15);
    color: white;
    padding: 8px 15px;
    border-radius: 30px;
    margin-right: 10px;
    margin-bottom: 10px;
    backdrop-filter: blur(10px);
}

.course-pricing {
    display: flex;
    align-items: center;
    gap: 15px;
    margin: 25px 0 35px;
    flex-wrap: wrap;
}

.original-price {
    font-size: 1.2rem;
    color: #999;
    text-decoration: line-through;
    font-weight: 500;
}

.discounted-price {
    font-size: 1.8rem;
    font-weight: 700;
    color: #4CAF50;
    background: rgba(76, 175, 80, 0.1);
    padding: 8px 16px;
    border-radius: 8px;
    border: 2px solid #4CAF50;
}

.course-meta i {
    margin-right: 8px;
    color: #ffffff;
}

.course-cta {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.course-image {
    flex: 1;
    min-width: 300px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.3s ease;
}

.course-image:hover {
    transform: perspective(1000px) rotateY(0);
}

.course-image img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 15px;
}

/* Course Details */
.course-details {
    padding: 80px 0;
    background-color: white;
}

.course-tabs {
    display: flex;
    border-bottom: 1px solid #e1e4e8;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 15px 25px;
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    color: #6c757d;
    cursor: pointer;
    position: relative;
    transition: all 0.3s ease;
}

.tab-btn:after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.tab-btn.active {
    color: var(--primary-color);
}

.tab-btn.active:after {
    width: 100%;
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Learning Outcomes */
.learning-outcomes {
    margin: 30px 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 15px;
}

.outcome {
    display: flex;
    align-items: flex-start;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 8px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.outcome:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.outcome i {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-right: 12px;
    margin-top: 3px;
}

/* Course Features */
.course-features {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 30px;
    margin: 50px 0;
}

.feature {
    text-align: center;
    padding: 30px 20px;
    border-radius: 10px;
    background-color: #f8f9fa;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.feature i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature h4 {
    margin: 15px 0 10px;
    color: var(--secondary-color);
}

/* Curriculum */
.curriculum-accordion {
    margin-top: 30px;
}

.module {
    border: 1px solid #e1e4e8;
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
}

.module-header {
    padding: 20px;
    background-color: #f8f9fa;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.module-header:hover {
    background-color: #f1f3f5;
}

.module-header h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--secondary-color);
}

.module-header i {
    transition: transform 0.3s ease;
}

.module-header.active i {
    transform: rotate(180deg);
}

.module-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.module-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.module-content li {
    padding: 15px 20px;
    border-top: 1px solid #e9ecef;
    display: flex;
    align-items: center;
}

.module-content li i {
    margin-right: 15px;
    color: #6c757d;
}

/* Course CTA */
.course-cta {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(135deg, #4a6ee0 0%, #6c5ce7 100%);
    color: white;
}

.course-cta h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.course-cta p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.9;
}

.course-cta .btn {
    font-size: 1.1rem;
    padding: 12px 35px;
}

.course-cta-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 30px;
}

.course-cta-buttons .btn {
    font-size: 1rem;
    padding: 12px 25px;
    min-width: 160px;
}

/* Responsive Styles */
@media (max-width: 992px) {
    .course-header h1 {
        font-size: 2.3rem;
    }
    
    .course-meta span {
        font-size: 0.85rem;
        padding: 6px 12px;
    }
    
    .course-pricing {
        gap: 10px;
    }

    .original-price {
        font-size: 1rem;
    }

    .discounted-price {
        font-size: 1.5rem;
        padding: 6px 12px;
    }
}

@media (max-width: 768px) {
    .course-header {
        padding: 100px 0 60px;
    }
    
    .course-header h1 {
        font-size: 2rem;
    }
    
    .course-meta span {
        font-size: 0.8rem;
        padding: 5px 10px;
    }
    
    .course-pricing {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 8px;
    }

    .original-price {
        font-size: 0.95rem;
    }

    .discounted-price {
        font-size: 1.4rem;
        padding: 6px 12px;
    }
    
    .course-cta {
        padding: 60px 0;
    }
    
    .course-cta h2 {
        font-size: 2rem;
    }
    
    .course-cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
    
    .course-cta-buttons .btn {
        width: 100%;
        max-width: 250px;
    }
    
    .course-cta {
        flex-direction: column;
        gap: 10px;
    }
}

@media (max-width: 576px) {
    .course-cta h2 {
        font-size: 1.8rem;
    }
    
    .course-cta .btn {
        width: 100%;
        margin-bottom: 10px;
    }
    
    .course-cta .btn:last-child {
        margin-bottom: 0;
    }
    
    .course-cta-buttons .btn {
        width: 100%;
        max-width: none;
    }
}