* {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: Arial, sans-serif;
            background: #f3f3f3;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            padding: 20px;
        }

        .container {
            text-align: center;
            background: #fff;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            max-width: 500px;
            width: 100%;
        }

        h1 {
            margin-bottom: 20px;
            font-size: 24px;
            color: #333;
        }

        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        @media (min-width: 480px) {
            form {
                flex-direction: column;
                justify-content: center;
            }
        }

        input[type="text"],
        input[type="email"],
        input[type="password"]{
            padding: 10px;
            font-size: 16px;
            width: 100%;
        }

        button {
            padding: 10px 20px;
            font-size: 16px;
            cursor: pointer;
            background-color: #f5476a;
            color: white;
            border: none;
            border-radius: 5px;
            transition: background-color 0.3s ease;
        }

        button:hover:not(:disabled) {
            background-color: #fc6a87;
        }

        .loading::after {
            content: '...';
            animation: dots 1s steps(3, end) infinite;
        }

        @keyframes dots {
            0% { content: ''; }
            33% { content: '.'; }
            66% { content: '..'; }
            100% { content: '...'; }
        }

        .sonuc {
            font-weight: bold;
            font-size: 18px;
        }

        .yes { color: green; }
        .used { color: orange; }
        .no { color: red; }
        
        ul{
            list-style:none;
        }
        ul li{
            list-style:none;
        }
        
        .sonuc {
            padding: 10px;
            border-radius: 5px;
        }
        .yes { background-color: #d4edda; color: #155724; }
        .used { background-color: #fff3cd; color: #856404; }
        .no, .cikis { background-color: #f8d7da; color: #721c24; }
        button.loading {
            background-color: #ccc;
            cursor: not-allowed;
        }
        .cikis:hover:not(:disabled) {
            background-color: #721c24;
            color: #f8d7da;
            transition:.3s;
        }