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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    margin: 5px;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #45a049;
}

.auth-buttons, .user-menu {
    text-align: center;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
}

.form-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.quiz-container {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.answer-option {
    display: block;
    padding: 10px;
    margin: 5px 0;
    background: #f8f8f8;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
}

.answer-option:hover {
    background: #eee;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .btn {
        display: block;
        margin: 10px auto;
        width: 80%;
    }
}