body {
            margin: 0;
            font-family: Arial, sans-serif;
            display: flex;
            height: 100vh;
        }
        nav {
            background-color: #4b2e2e;
            color: #fff;
            width: 250px;
            padding: 20px;
            box-shadow: 2px 0 5px rgba(0,0,0,0.3);
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        nav h1 {
            writing-mode: vertical-rl;
            transform: rotate(180deg);
            margin-bottom: 20px;
            font-size: 24px;
            letter-spacing: 2px;
        }
        .suche input[type="text"] {
            padding: 8px;
            width: 90%;
            margin-bottom: 20px;
        }
        .alphabet-nav {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
        }
        .alphabet-nav a {
            margin: 2px;
            text-decoration: none;
            font-weight: bold;
            color: #fff;
            background-color: #333;
            padding: 5px 8px;
            border-radius: 3px;
        }
        .alphabet-nav a:hover {
            background-color: #555;
        }
        main {
            flex-grow: 1;
            padding: 20px;
            background-color: #f9f6f1;
            overflow-y: auto;
        }
        .begriffsliste ul {
            list-style-type: none;
            padding: 0;
        }
        .begriffsliste li {
            margin-bottom: 10px;
            padding: 10px;
            border-bottom: 1px solid #ccc;
        }