* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(to right, #f3e5f5, #e1f5fe);
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        p {
            margin: 1.2em 0;
        }

        nav {
            position: fixed;
            width: 100%;
            height: 75px;
            line-height: 75px;
            padding: 0 100px;
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 6px rgba(0,0,0,0.1);
            z-index: 9000;
            display: flex;
            justify-content: space-between;
            align-items: center;
            backdrop-filter: blur(5px);
        }
        nav .logo p {
            font-size: 30px;
            font-weight: bold;
            color: #4a148c;
            cursor: pointer;
        }
        .dropdown {
            position: relative;
        }
        .dropbtn {
            font-size: 30px;
            background: none;
            border: none;
            cursor: pointer;
            display: none;
        }
        .dropdown-content {
            display: flex;
            gap: 20px;
        }
        nav li {
            list-style: none;
        }
        nav li a {
            text-decoration: none;
            font-size: 18px;
            text-transform: uppercase;
            padding: 0 20px;
            color: #4a148c;
            transition: color 0.3s;
        }
        nav li a:hover {
            color: #f57c00;
        }
        @media screen and (max-width: 768px) {
            .dropbtn {
                display: block;
            }
            .dropdown-content {
                display: none;
                position: absolute;
                top: 75px;
                right: 0;
                flex-direction: column;
                background-color: white;
                width: 100%;
                text-align: center;
                padding: 10px 0;
            }
            .dropdown-content.show {
                display: flex;
            }
        }
        main {
            padding: 120px 20px 40px;
            max-width: 1000px;
            margin: auto;
            animation: fadeIn 2s ease;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        h1, h2 {
            color: #4a148c;
            text-align: center;
            margin-bottom: 20px;
        }
        .chapter-select {
            text-align: right;
            margin-bottom: 20px;
        }
        select, button {
            padding: 8px 12px;
            font-size: 16px;
            border-radius: 5px;
            border: 1px solid #ccc;
            margin-left: 10px;
        }
        .chapter {
            display: none;
        }
        .chapter.active {
            display: block;
        }
        footer {
            text-align: center;
            padding: 20px;
            background-color: #4a148c;
            color: white;
        }