body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #dee09e;
    color: #333;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}

.container {
    background: #faf3e0; /* soft light beige */
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 600px;
    padding: 40px;
    text-align: center;
    box-sizing: border-box;
}


#start-screen h1 {
    font-size: 2.5em;
    color: #336699;
    margin-bottom: 20px;
}

#start-screen p {
    font-size: 1.1em;
    color: #555;
    margin-bottom: 30px;
}

#quiz-container {
    display: none;
    /* Hidden by default */
}

.timer {
    font-size: 1.3em;
    font-weight: bold;
    margin-bottom: 25px;
    color: #d9534f;
}

.question {
    font-size: 1.5em;
    font-weight: 600;
    color: #333;
    margin-bottom: 30px;
    line-height: 1.4;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 30px;
}

.option {
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease-in-out;
    font-size: 1.1em;
    background-color: #f9f9f9;
    color: #333;
}

.option:hover:not(:disabled) {
    background-color: #e9ecef;
    border-color: #007bff;
    color: #007bff;
}

.option:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

.option.correct {
    background-color: #5cb85c;
    color: #fff;
    border-color: #5cb85c;
}

.option.incorrect {
    background-color: #d9534f;
    color: #fff;
    border-color: #d9534f;
}

.result {
    font-size: 2em;
    color: #336699;
    font-weight: bold;
    margin-bottom: 20px;
}

.result span {
    color: #007bff;
    font-size: 1.3em;
}

.btn {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 10px;
    cursor: pointer;
    margin-top: 20px;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #0056b3;
}

#next-btn,#restart-btn {
    display: none;
}