body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
    line-height: 1.6;
}

header {
    background: #003366;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h1 {
    margin: 0;
    font-size: 2.5em;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

h2, h3 {
    color: #003366;
}

h3 {
    margin-top: 20px;
    padding: 10px;
    background: #c0d9f3;
    border-left: 5px solid #003366;
    border-radius: 5px;
}

.question-block {
    margin-bottom: 20px;
    padding: 15px;
    background: #ffffff;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.answer-wrapper {
    margin: 5px 0;
}

label {
    margin-left: 10px;
}

button {
    display: inline-block;
    background: #00cc6d;
    color: white;
    padding: 10px 20px;
    margin: 10px 5px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: background 0.3s ease;
}

button:hover {
    background: #009945;
}

.hidden {
    display: none;
}

#grade-summary {
    text-align: center;
    margin-bottom: 20px;
    padding: 15px;
    background: #e6ffe6;
    border: 1px solid #b3ffb3;
    border-radius: 8px;
    color: #006600;
    font-weight: bold;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

#grade-summary.fail {
    background: #ffe6e6;
    border-color: #ffb3b3;
    color: #cc0000;
}

footer {
    text-align: center;
    margin-top: 20px;
    padding: 10px 0;
    background: #f4f4f9;
    font-size: 0.9em;
    color: #666;
    border-top: 1px solid #ddd;
}

.test-option {
    margin: 10px 0;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    cursor: pointer;
    text-align: center;
}

/* Center and Style the "Select a Test" Section */
h2 {
    text-align: center;
    font-size: 2em;
    color: #003366; /* Soft blue color */
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1); /* Subtle shadow for depth */
    margin-bottom: 20px;
    padding: 10px;
    display: inline-block; /* Keeps width minimal while centered */
}

/* Optional Centering Wrapper */
.center-wrapper {
    text-align: center;
    margin-top: 20px;
}