body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.container {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 30px;
    width: 100%;
    max-width: 700px;
    text-align: center;
}

h1 {
    color: #0056b3;
    margin-bottom: 15px;
}

h2 {
    color: #007bff;
    margin-bottom: 20px;
}

p {
    line-height: 1.6;
    margin-bottom: 20px;
}

.hidden {
    display: none;
}

#quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

#timer {
    font-size: 1em;
    font-weight: bold;
    color: #555;
}

#question-container {
    text-align: left;
    margin-bottom: 25px;
}

#question-text {
    font-size: 1.2em;
    font-weight: 500;
    margin-bottom: 20px;
}

#options-container {
    display: flex;
    flex-direction: column;
}

.option {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    padding: 15px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out, border-color 0.2s ease-in-out;
}

.option:hover {
    background-color: #e9ecef;
}

.option.selected {
    background-color: #cce5ff;
    border-color: #b8daff;
    font-weight: bold;
}

.option.correct {
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.option.wrong {
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

button {
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 5px;
    padding: 12px 25px;
    font-size: 1em;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 10px;
}

button:hover {
    background-color: #0056b3;
}

button:disabled {
    background-color: #a0a0a0;
    cursor: not-allowed;
}