body {
    font-family: 'Arial', sans-serif;
    background-color: #f0f8ff;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    flex: 1;
}

.screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.hidden {
    display: none;
}

h1 {
    color: #1a5276;
    margin-bottom: 1.5rem;
}

h2 {
    color: #2874a6;
    margin-bottom: 1.5rem;
}

p {
    color: #34495e;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.btn {
    background-color: #2874a6;
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    margin: 0.5rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #1a5276;
}

.btn-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin: 1rem 0;
    width: 100%;
}

.answer-btn {
    text-align: left;
    padding: 1rem;
}

.correct {
    background-color: #27ae60;
}

.incorrect {
    background-color: #e74c3c;
}

.header {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-bottom: 2rem;
}

.question-count, .timer {
    font-weight: bold;
    color: #2874a6;
}

.timer {
    color: #e74c3c;
}

#question-container {
    width: 100%;
}

footer {
    text-align: center;
    padding: 1rem;
    background-color: #1a5276;
    color: white;
    margin-top: auto;
}

footer a {
    color: #f0f8ff;
    text-decoration: none;
    font-weight: bold;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        margin: 1rem;
        padding: 1rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    h2 {
        font-size: 1.2rem;
    }
    
    .btn {
        padding: 0.6rem 1.2rem;
    }
}