body {
    font-family: 'Roboto', sans-serif;
    background-color: #f7f9fc;
    margin: 0;
    padding: 0;
    color: #333;
}

.container {
    width: 90%;
    max-width: 1000px;
    margin: 40px auto;
    background-color: #ffffff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    margin-top: 0;
    font-size: 2.5em;
    color: #333;
}

p {
    color: #666;
    line-height: 1.5;
}

#test-menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 30px;
}

.test-button {
    padding: 15px 25px;
    margin: 10px;
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
    font-size: 1em;
    width: 80%;
    max-width: 300px;
    text-align: center;
}

.test-button:hover {
    background-color: #0056b3;
    transform: scale(1.05);
}

#progress-bar-container {
    width: 100%;
    background-color: #e0e0e0;
    border-radius: 5px;
    margin: 20px 0;
    height: 20px;
}

#progress-bar {
    width: 0%;
    height: 100%;
    background-color: #28a745;
    border-radius: 5px;
}

.question-section {
    margin-top: 20px;
}

button {
    padding: 10px 20px;
    margin: 10px 0;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #45a049;
}

.hidden {
    display: none;
}

.reset-button {
    background-color: #f44336;
}

.reset-button:hover {
    background-color: #e53935;
}

@media (max-width: 768px) {
    .test-button {
        width: 100%;
        margin-bottom: 15px;
    }
    header h1 {
        font-size: 2em;
    }
    .container {
        width: 95%;
        padding: 15px;
    }
}

@media (max-width: 480px) {
    .container {
        width: 100%;
        padding: 10px;
    }
    header h1 {
        font-size: 1.8em;
    }
    #progress-bar-container {
        height: 15px;
    }
}