:root {
            --headerblue: #bcd9ff;    
            --boxblue-top: #eef5ff;
            --boxblue-bottom: #dfeaff;
            --borderblue: #c8d8f3;
            --textdark: #1b314f;
            --linkblue: #2b63a3;
            --background: #f3f7fb;
        }

        body {
            margin: 0;
            font-family: "Inter", sans-serif;
            background-color: var(--background);
            color: var(--textdark);
        }

      
        header {
            background: var(--headerblue);
            padding: 50px 25px;
            text-align: center;
            border-bottom: 2px solid #a7c6f3;
        }

        header h1 {
            margin: 0;
            font-size: 2.7rem;
            font-weight: 600;
        }

        header p {
            margin-top: 10px;
            font-size: 1.15rem;
            color: #244e86;
        }

   
        .intro-box {
            max-width: 900px;
            background: white;
            margin: 50px auto;
            padding: 40px 30px;
            border-radius: 16px;
            box-shadow: 0 4px 22px rgba(0, 0, 0, 0.08);
        }

        .intro-box h2 {
            font-family: "Merriweather", serif;  
            font-size: 2rem;
            margin-bottom: 10px;
            color: #244e86;
        }

        .intro-box p {
            font-family: "Merriweather", serif;
            font-size: 1.15rem;
            line-height: 1.7;
            margin-bottom: 25px;
            color: #314b6e;
        }

    
        .topics {
            display: grid;
            gap: 18px;
            margin-top: 20px;
        }

        .topic-box {
            background: linear-gradient(to bottom, var(--boxblue-top), var(--boxblue-bottom));
            padding: 18px 20px;
            border-radius: 12px;
            border: 1px solid var(--borderblue);
            transition: 0.25s;
            margin: 10px 0px;
        }

        .topic-box a {
            text-decoration: none;
            color: var(--linkblue);
            font-size: 1.25rem;
            font-weight: 500;
        }

        .topic-box:hover {
            background: linear-gradient(to bottom, #e3edff, #cfdfff);
            transform: translateY(-3px);
        }

   
        footer {
            text-align: center;
            margin-top: 50px;
            padding: 25px;
            color: #456b99;
            font-size: 0.9rem;
        }