.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.course-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.course-header::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"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.course-header .container {
    position: relative;
    z-index: 1;
}

.course-header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

.course-header p {
    font-size: 1.125rem;
    font-weight: 400;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.main-content {
    padding: 3rem 0;
}

.course-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: all 0.2s ease;
}

.course-card:hover {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    transform: translateY(-1px);
}

.course-thumbnail {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.course-content {
    padding: 2rem;
}

.course-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 1rem;
    letter-spacing: -0.025em;
}

.course-content p {
    font-size: 1rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.price-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    border: 1px solid var(--gray-200);
    padding: 2rem;
    position: sticky;
    top: 2rem;
}

.price-display {
    text-align: center;
    margin-bottom: 2rem;
}

.price-amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.price-label {
    font-size: 0.875rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    width: 100%;
    margin-bottom: 0.75rem;
    letter-spacing: 0.025em;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(30, 58, 138, 0.3);
}

.btn-success {
    background-color: var(--success);
    color: white;
}

.btn-success:hover {
    background-color: #059669;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-outline {
    background-color: transparent;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-outline:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
    transform: translateY(-1px);
}

.btn-warning {
    background-color: var(--warning);
    color: white;
}

.btn-warning:hover {
    background-color: #d97706;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.section-divider {
    height: 1px;
    background-color: var(--gray-200);
    margin: 2rem 0;
}

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

.feature-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    align-items: center;
}

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

.feature-list li::before {
    content: '✓';
    color: var(--success);
    font-weight: bold;
    margin-right: 0.75rem;
    font-size: 1.125rem;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-badge.purchased {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.status-badge.available {
    background-color: rgba(30, 58, 138, 0.1);
    color: var(--primary);
}

@media (max-width: 768px) {
    .course-header {
        padding: 2rem 0;
    }
    
    .main-content {
        padding: 2rem 0;
    }
    
    .course-content {
        padding: 1.5rem;
    }
    
    .price-card {
        position: static;
        margin-top: 2rem;
    }
}

.back-to-home {
    margin-top: 1.5rem;
    text-align: center;
}

.back-to-home .btn {
    width: auto;
    padding: 0.75rem 1.5rem;
}