:root {
     --primary: #1976D2; /* Sky Blue */
            --secondary: #000000; /* Black */
            --tertiary: #FFFFFF; /* White */
            --light-gray: #f5f5f5;
            --dark-gray: #333333;
}

html, body {
    height: 100%;
    margin: 0;
    font-family: 'Segoe UI', 'Roboto', sans-serif;
}

 
.sticky-header {
    position: sticky;
    top: 0;
    z-index: 1000;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-black));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-section {
    background: linear-gradient(135deg, #c4d6f1 0%, #6e9be2 100%);
    padding: 80px 0;
}

.doctor-image {
    border-radius: 50%;
    border: 5px solid var(--primary-blue);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.article-card, .book-card, .video-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.article-card:hover, .book-card:hover, .video-card:hover, .course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.course-card {
    background: linear-gradient(135deg, #ccc 0%, #7bb6f1 100%);
    color: white;
}

.youtube-section {
    background-color: #f8f9fa;
}

 /* Footer */
        footer {
            background-color: var(--secondary);
            color: var(--tertiary);
            padding: 50px 0 20px;
        }
        
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
            margin-bottom: 30px;
        }
        
        .footer-col {
            flex: 1;
            min-width: 200px;
        }
        
        .footer-col h3 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: var(--tertiary);
        }
        
        .footer-col ul {
            list-style: none;
        }
        
        .footer-col ul li {
            margin-bottom: 10px;
        }
        
        .footer-col ul li a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-col ul li a:hover {
            color: var(--primary);
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #ccc;
            font-size: 0.9rem;
        }
        
        /* Responsive Design */
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                text-align: center;
            }
            
            
            
            .page-header h2 {
                font-size: 2rem;
            }
            
            .section {
                padding: 60px 0;
            }
        }
        
        @media (max-width: 576px) {
            
            
            
    }