body {
            font-family: 'Noto Serif Devanagari', serif;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            color: #333;
            line-height: 1.6;
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        .container-science {
            /* max-width: 1000px; */
            width: 70%;
            margin: .5rem auto;
            padding: 2rem;
            background: #fff;
            border-radius: 10px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        }

        .container-science h1 {
            width: 100%;
            /* margin: 2px auto; */
            padding: 1rem;
            background: #fff;
            border-radius: 12px;
            color: #068576;
            /* box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12); */
            text-align: center;
            /* transition: transform 0.3s ease, box-shadow 0.3s ease; */
            font-size: 1.4rem;
            line-height: 1.5;
            transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
            border: 4px solid;
            border-color: #0d9488 #14b8a6 #14b8a6 #0d9488;
            box-shadow: 3px 3px 6px rgba(0, 0, 0, 0.3),
                /* Outer shadow for depth */
                -2px -2px 4px rgba(255, 255, 255, 0.5) inset,
                /* Inner highlight */
                2px 2px 4px rgba(0, 0, 0, 0.2) inset;
            transition: box-shadow 0.3s ease, border-color 0.3s ease;
            -webkit-border-radius: 8px;
            -moz-border-radius: 8px;
            -ms-border-radius: 8px;
            -o-border-radius: 8px;
        }

        .container-science h1:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.18);
            border-color: #ef2626 #ab463e #b86c14 #f61313;
            color: #ef2626;
            cursor: pointer;
        }

        .fact-list {
            list-style: none;
            padding: 0;
        }

        .fact-list li {
            background: #e8f0fe;
            margin: 10px 0;
            padding: 15px;
            border-radius: 8px;
            transition: transform 0.3s ease, background 0.3s ease;
        }

        .fact-list li:hover {
            transform: translateY(-5px);
            background: #d1e7ff;
        }

        .fact-list li i {
            margin-right: 10px;
            color: #3498db;
        }

        .back-to-top {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: #3498db;
            color: #fff;
            padding: 10px 15px;
            border-radius: 50%;
            cursor: pointer;
            display: none;
        }

        .back-to-top:hover {
            background: #2980b9;
        }

        @media (max-width: 800px) {
            .container-science h1 {
                font-size: 1.4rem;

            }

            .container-science {
                width: 90%;
                margin: 1rem auto;
                padding: 1rem 2rem;
            }

            .fact-list li {
                font-size: 1rem;
                padding: 10px;
            }
        }

        @media (max-width:480px) {
            .container-science {
                width: 100%;
                padding: .8rem;
            }

            .fact-list li {
                font-size: 1rem;
                padding: 10px;
            }
        }


        /* ----------------------------------------- */
        /* 
         h1 {
            color: #2c3e50;
            text-align: center;
            /* border-bottom: 2px solid #3498db; */
        /* padding-bottom: 10px;
        } */
        /* h2 {
            color: #2980b9;
            margin-top: 25px;
            border-left: 4px solid #3498db;
            padding-left: 10px;
        }
        h3 {
            color: #16a085;
        }
        .important {
            background-color: #fffde7;
            padding: 15px;
            border-left: 4px solid #ffd600;
            margin: 15px 0;
        }
        .exam-fact {
            background-color: #e3f2fd;
            padding: 12px;
            border-radius: 5px;
            margin: 10px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
        }
        table, th, td {
            border: 1px solid #ddd;
        }
        th, td {
            padding: 12px;
            text-align: left;
        }
        th {
            background-color: #f2f2f2;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 20px auto;
        }
        .diagram {
            text-align: center;
            margin: 20px 0;
            font-style: italic;
            color: #666;
        }

        .timeline {
            position: relative;
            padding-left: 50px;
            margin: 30px 0;
        }
        .timeline-item {
            position: relative;
            margin-bottom: 20px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -30px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: #3498db;
        }
        .timeline-year {
            font-weight: bold;
            color: #2980b9;
        } */


        .container-science h2,
        .container-science h3 {
            color: #006400;
            margin-top: 1.5rem;

            /* Dark green */
        }

        .container-science p,
        .container-science ul,
        .container-science ol {
            line-height: 1.6;
            /* margin-left: 1.5rem; */
            font-size: 1.1rem;
        }

        /* Table Styles */
        .tab2col {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1), inset 0 2px 4px rgba(255, 255, 255, 0.6);
            /*3Deffect*/
            border: 1px solid #228b22;
            border-radius: 6px;
            overflow: hidden;
            transition: transform 0.3s ease;
            -webkit-border-radius: 6px;
            -moz-border-radius: 6px;
            -ms-border-radius: 6px;
            -o-border-radius: 6px;
        }

        .tab2col th,
        .tab2col td {
            padding: 12px;
            text-align: left;
            border-bottom: 1px solid #ddd;
            font-size: 1.1rem;
        }

        .tab2col th {
            background-color: #228b22;
            /* Forest green */
            color: white;
        }

        .tab2col tr:nth-child(even) {
            background-color: #f0fff0;
            /* Honeydew green */
        }

        .tab2col tr:hover {
            background-color: #90ee90;
            /* Light green */
            transform: scale(1.02);
            /* Hover scale effect */
            transition: background-color 0.3s, transform 0.3s;
        }

        /* Exam Fact and Important Divs */
        .exam-fact,
        .important {
            background-color: #e0ffff;
            /* Light cyan */
            border-left: 5px solid #20b2aa;
            /* Light sea green */
            padding: 15px;
            margin: 20px 0;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1),
                inset 0 2px 4px rgba(255, 255, 255, 0.6);
            /* 3D effect */
            animation: slideIn 0.5s ease;
            font-size: 1.1rem;
        }

        .exam-fact strong,
        .important h3 {
            color: #008080;
            /* Teal */
        }

        /* Animations */
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(-20px);
            }

            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes slideIn {
            from {
                transform: translateX(-20px);
                opacity: 0;
            }

            to {
                transform: translateX(0);
                opacity: 1;
            }
        }

        /* Responsive Design */
        @media (max-width: 800px) {
            /* Tablet */


            .tab2col th,
            .tab2col td {
                padding: 10px;
                font-size: 14px;
            }


            .container-science h2 {
                font-size: 20px;
            }

            .container-science h3 {
                font-size: 18px;
            }
        }

        @media (max-width: 480px) {
            /* Mobile */


            .tab2col {
                font-size: 12px;
            }

            .tab2col th,
            .tab2col td {
                padding: 8px;
                font-size: 1rem;
            }

            .container-science h2 {
                font-size: 18px;
                margin-top: 1.5rem;
            }

            .container-science h3 {
                font-size: 16px;
            }

            .container-science ul,
            .container-science ol {
                padding-left: 20px;
            }
        }