* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: Arial, sans-serif;
        }

        /* COLOR VARIABLES */
        :root {
            --primary-blue: #6884d3;      
            --dark-blue: #4a66b0;         
            --light-blue: #8fa4e0;        
            --white: #ffffff;              
            --light-gray: #f5f5f5;         
            --text-color: #333333;         
        }

        /* BODY STYLING  */
        body {
            background-color: var(--light-gray);
            color: var(--text-color);
            line-height: 1.6;
        }

        /*  HEADER SECTION */
        .header {
           background: 
                /* Lighter overlay for better image visibility */
                linear-gradient(rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.3)),
                /* Your background image - SIRF HEADER KI PICHE */
                url("../img/WhatsApp Image 2025-12-30 at 6.00.47 PM.jpeg");
            background-attachment: fixed;
            background-size: cover;
            background-position: center 40%;
            background-repeat: no-repeat;
            position: relative;
            padding: 40px 0;
            text-align: center;
           
            
            /* HEADER KI HEIGHT BADHAI HAI */
            height: 300px;
        }
        .header-content {
            position: relative;
            z-index: 1;
        }

        .logo {
            font-size: 32px;
            font-weight: bold;
            color: var(--dark-blue);
            text-shadow: 2px 2px 4px rgba(255, 255, 255, 0.9);
            margin-bottom: 15px;
        }
        .header-subtitle {
            color: var(--dark-blue);
            font-size: 20px;
            font-weight: bold;
            text-shadow: 1px 1px 3px rgba(255, 255, 255, 0.9);
        }

        /*  NAVIGATION BAR  */
        .nav-bar {
            background-color: var(--white);
            display: flex;
            justify-content: center;
            margin: 20px auto;
            max-width: 1200px;
            border-radius: 8px;
            box-shadow:  0 2px 10px rgba(104, 132, 211, 0.2);
            border: 1px solid var(--light-blue);
            position: relative;
            top: 15px;
        }


        .nav-link {
            padding: 15px 30px;
            text-decoration: none;
            color: var(--text-color);
            font-weight: bold;
            transition: all 0.3s ease;
        }

        .nav-link:hover {
            background: var(--light-blue);
            color: var(--white);
        }

        /* MAIN CONTENT CONTAINER */
        .main-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* CONTENT SECTIONS */
        .content-section {
            background-color: var(--white);
            border-radius: 10px;
            padding: 30px;
            margin: 20px 0;
            box-shadow: 0 3px 15px rgba(104, 132, 211);
        }
         .header-subtitle{
            margin-top: 10px; 
            color: var(--dark-blue);
            font-size: 18px;
            }

        /* SECTION HEADINGS  */
        .main-heading {
            color: var(--dark-blue);
            font-size: 36px;
            margin-bottom: 20px;
            border-bottom: 3px solid var(--primary-blue);
            padding-bottom: 10px;
        }

        .section-heading {
            color: var(--dark-blue);
            font-size: 28px;
            margin: 25px 0 15px;
        }

        /*  HIGHLIGHTED BOX */
        .highlight-box {
            background: linear-gradient(135deg, var(--light-blue), var(--primary-blue));
            color: var(--white);
            padding: 25px;
            margin: 25px 0;
            border-radius: 8px;
            border-left: 5px solid var(--dark-blue);
        }

        /*  STATISTICS GRID*/
        .stats-container {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin: 30px 0;
        }

        .stat-box {
            background: var(--white);
            padding: 25px;
            border-radius: 8px;
            text-align: center;
            border: 2px solid var(--light-blue);
        }

        .stat-number {
            color: var(--dark-blue);
            font-size: 32px;
            font-weight: bold;
            margin-bottom: 10px;
        }

        /* SYMPTOMS GRID  */
        .symptoms-container {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin: 25px 0;
        }

        .symptom-box {
            background: var(--white);
            padding: 20px;
            border-radius: 8px;
            border-left: 4px solid var(--primary-blue);
            transition: transform 0.3s ease;
        }

        .symptom-box:hover {
            transform: translateY(-3px);
        }

        .symptom-title {
            color: var(--dark-blue);
            margin-bottom: 10px;
        }

        /*  PREVENTION GRID  */
        .prevention-container {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin: 25px 0;
        }

        .prevention-box {
            background: var(--white);
            padding: 25px;
            border-radius: 8px;
            text-align: center;
            border-top: 4px solid var(--primary-blue);
        }

        .vaccine-status {
            padding: 8px 15px;
            border-radius: 20px;
            font-weight: bold;
            margin: 10px 0;
            display: inline-block;
            background: var(--light-blue);
            color: var(--dark-blue);
        }

        /* CONSEQUENCES GRID */
       .consequences-container {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin: 25px 0;
        }

        .consequence-box {
            background: var(--white);
            padding: 20px;
            border-radius: 8px;
            border-left: 4px solid var(--primary-blue);
            transition: transform 0.3s ease;
        }

        .consequence-box:hover {
            transform: translateY(-3px);
        }

        .consequence-title {
            color: var(--dark-blue);
            margin-bottom: 10px;
        }
       /* SOURSE INFORMATION */
        .info-section {
            margin: 20px 0;
        }

        .info-heading {
            color: var(--primary-blue);
            margin-bottom: 15px;
            font-size: 20px;
        }

        .transmission-item {
            background: #e7f3ff;
            padding: 12px 15px;
            margin: 10px 0;
            border-radius: 6px;
            border-left: 3px solid var(--primary-blue);
        }

        .source-info {
            background: var(--white);
            padding: 20px;
            border-radius: 8px;
            margin: 20px 0;
            border-left: 4px solid var(--primary-blue);
        }
        /*  FOOTER */
        .footer {
            background: var(--dark-blue);
            color: var(--white);
            text-align: center;
            padding: 25px 0;
            margin-top: 50px;
        }

        /* RESPONSIVE DESIGN */
        @media (max-width: 768px) {
            .stats-container,
            .symptoms-container,
            .prevention-container,
            .consequences-container,
            .schedule-container {
                grid-template-columns: 1fr;
            }
            
            .nav-bar {
                flex-direction: column;
                text-align: center;
            }
            
            .main-container {
                padding: 0 15px;
            }
        }