* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: flex-start;
            padding: 20px 10px 10px;
        }

        .container {
            width: 100%;
            max-width: 600px;
        }

        .card {
            background: white;
            border-radius: 8px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            padding: 50px 40px;
            text-align: center;
            margin: 5px;
        }

        .logo-container {
            margin-bottom: 50px;
        }

        .logo {
            max-width: 350px;
            width: 100%;
            height: auto;
        }

        .nav-buttons {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .nav-btn {
            display: block;
            background: #3498db;
            color: white;
            text-decoration: none;
            padding: 22px 40px;
            border-radius: 15px;
            font-size: 20px;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 8px 25px rgba(52, 152, 219, 0.3);
            position: relative;
            overflow: hidden;
        }

        .nav-btn:before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.5s;
        }

        .nav-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 35px rgba(52, 152, 219, 0.4);
        }

        .nav-btn:hover:before {
            left: 100%;
        }

        .nav-btn:active {
            transform: translateY(-1px);
        }

        .spacer {
            height: 25px;
        }

        /* Desktop Optimierungen */
        @media (min-width: 769px) {
            .container {
                max-width: 700px;
            }
            
            .card {
                padding: 60px 50px;
                margin: 5px;
            }
            
            .logo {
                max-width: 400px;
            }
            
            .nav-btn {
                padding: 24px 50px;
                font-size: 22px;
            }
            
            .spacer {
                height: 30px;
            }
        }

        /* Mobile Optimierungen */
        @media (max-width: 480px) {
            .card {
                padding: 30px 20px;
                margin: 5px;
                border-radius: 8px;
            }

            .logo {
                max-width: 250px;
            }

            .nav-btn {
                padding: 16px 25px;
                font-size: 16px;
            }

            .spacer {
                height: 15px;
            }
        }

        @media (max-width: 360px) {
            .card {
                padding: 25px 15px;
                margin: 5px;
            }

            .logo {
                max-width: 220px;
            }

            .nav-btn {
                padding: 14px 20px;
                font-size: 15px;
            }
        }

        /* Landscape Mobile */
        @media (max-height: 600px) and (orientation: landscape) {
            body {
                padding: 5px 3px 3px;
            }
            
            .card {
                padding: 20px;
                margin: 5px;
            }
            
            .logo-container {
                margin-bottom: 25px;
            }
            
            .logo {
                max-width: 200px;
            }
            
            .nav-buttons {
                gap: 10px;
            }
            
            .nav-btn {
                padding: 12px 25px;
                font-size: 15px;
            }
            
            .spacer {
                height: 10px;
            }
        }