@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .login-box {
        padding: 25px;
        margin: 20px auto;
    }
    
    .exam-header {
        flex-direction: column;
        text-align: center;
        gap: 20px;
    }
    
    .timer-section {
        text-align: center;
    }
    
    .exam-content {
        padding: 15px;
    }
    
    .question {
        padding: 15px;
    }
    
    .exam-footer {
        flex-direction: column;
        gap: 10px;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
    }
    
    .modal-content {
        margin: 20px;
        max-width: calc(100% - 40px);
    }
    
    .score-number {
        font-size: 36px;
    }
}

@media (max-width: 480px) {
    .login-box {
        padding: 20px;
    }
    
    .logo h1 {
        font-size: 24px;
    }
    
    .exam-header {
        padding: 20px;
    }
    
    .timer {
        font-size: 24px;
        padding: 12px 15px;
    }
    
    .question-text {
        font-size: 16px;
    }
    
    .score-number {
        font-size: 32px;
    }
    
    .score-percent {
        font-size: 18px;
    }
}