body {
    font-family: 'Sarabun', sans-serif;
    background-color: #F0E8D8; /* สีพื้นหลังคล้ายทราย */
    background-image: url('https://img5.pic.in.th/file/secure-sv1/photo_--_--38593df1ae64df70.jpg'); /* Placeholder - เปลี่ยนเป็นภาพของคุณ */
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
}

.container {
    background-color: rgba(255, 255, 255, 0.9); /* พื้นหลังโปร่งแสงเล็กน้อย */
    padding: 25px 30px;
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    width: 100%;
    max-width: 700px;
    text-align: center;
    border: 2px solid #B8860B; /* สีทองเข้ม */
}

h1, h2 {
    color: #006400; /* สีเขียวเข้ม */
}

.input-group {
    margin-bottom: 15px;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-weight: bold;
}

input[type="text"], select {
    width: calc(100% - 22px);
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: 'Sarabun', sans-serif;
    font-size: 1em;
}

button {
    background-color: #006400; /* สีเขียวเข้ม */
    color: white;
    border: none;
    padding: 12px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 1em;
    font-family: 'Sarabun', sans-serif;
    font-weight: bold;
    margin: 10px 5px;
    cursor: pointer;
    border-radius: 8px;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

button:hover {
    background-color: #004d00; /* สีเขียวเข้มขึ้น */
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

.hidden {
    display: none !important;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #B8860B;
    font-size: 0.9em;
}

#question-container {
    margin-bottom: 20px;
    min-height: 60px;
}

#question-text {
    font-size: 1.2em;
    font-weight: bold;
    color: #333;
}

#options-container button {
    display: block;
    width: 100%;
    margin: 8px 0;
    background-color: #f0f0f0;
    color: #333;
    border: 1px solid #ddd;
    text-align: left;
    padding-left: 20px;
}

#options-container button:hover {
    background-color: #e0e0e0;
}

#options-container button.correct {
    background-color: #90EE90 !important; /* Light green */
    color: black !important;
    border-color: #2E7D32 !important;
}

#options-container button.incorrect {
    background-color: #FFCCCB !important; /* Light red */
    color: black !important;
    border-color: #C62828 !important;
}

#options-container button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.feedback {
    margin-top: 15px;
    padding: 10px;
    border-radius: 5px;
    font-style: italic;
}

.feedback.correct {
    background-color: #e6ffed;
    color: #006400;
    border: 1px solid #006400;
}

.feedback.incorrect {
    background-color: #ffe6e6;
    color: #D22B2B;
    border: 1px solid #D22B2B;
}

#end-screen p {
    font-size: 1.1em;
    margin: 10px 0;
}

#finalScore {
    font-size: 1.5em;
    font-weight: bold;
    color: #006400;
}

.credit {
    margin-top: 20px;
    font-size: 0.8em;
    color: #777;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    h1 {
        font-size: 1.5em;
    }
    .quiz-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .quiz-header div {
        margin-bottom: 5px;
    }
    #question-text {
        font-size: 1.1em;
    }
    #options-container button {
        font-size: 0.9em;
    }
}