body {
            font-family: 'Arial', sans-serif;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            margin: 0;
            background: linear-gradient(to bottom, #80dfff, #b3ffff);
            padding: 20px;
            text-align: center;
        }
        .header {
            margin-bottom: 20px;
        }
        .logo {
            width: 60px;
        }
        .title {
            font-size: 28px;
            font-weight: bold;
            color: #333;
            margin: 8px 0;
        }
        .motto {
            font-size: 18px;
            color: #777;
            margin: 4px 0 20px 0;
        }
        .card {
            width: 400px;
            height: 400px;
            background: linear-gradient(to bottom, #80ff80, #e6ffe6);
            border-radius: 15px;
            padding: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            text-align: center;
            transition: transform 0.4s, box-shadow 0.4s;
        }
        .card:hover {
            transform: scale(1.05);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }
        .question-number {
            font-weight: bold;
            color: blue;
            font-size: 20px;
        }
        .timer {
            font-size: 20px;
            font-weight: bold;
            color: blue;
        }
        .option {
            margin: 10px 0;
            padding: 15px;
            border-radius: 8px;
            background-color: white;
            border: 2px solid #80ffff;
            cursor: pointer;
            transition: all 0.3s;
            font-size: 16px;
            color: #333;
        }
        .option:hover {
            background-color: #4CAF50;
            color: white;
        }
        .score {
            font-size: 20px;
            color: #333;
            margin-top: 20px;
        }
        .result-item {
            text-align: left;
            margin-top: 10px;
        }
        .correct {
            color: green;
        }
        .incorrect {
            color: red;
        }
        .footer {
            margin-top: 20px;
            font-size: 14px;
            color: #333;
        }
        .footer a {
            color: #4CAF50;
            margin: 0 8px;
            text-decoration: none;
        }
        .footer a:hover {
            text-decoration: underline;
        }
        @keyframes flip {
            from { transform: rotateY(90deg); opacity: 0; }
            to { transform: rotateY(0); opacity: 1; }
        }