:root {
    --primary-color: #2A2A72;
    --secondary-color: #009FFD;
    --background: #F5F6FA;
    --correct: #2ecc71;
    --incorrect: #e74c3c;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', sans-serif;
}

body {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.quiz-container {
    background: var(--background);
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 600px;
    padding: 30px;
}

.quiz-header {
    text-align: center;
    margin-bottom: 30px;
}

.question {
    font-size: 1.2rem;
    margin-bottom: 25px;
    line-height: 1.5;
    color: #333;
    font-weight: 600;
}

.answers-container {
    display: grid;
    gap: 15px;
    margin-bottom: 25px;
}

.answer-btn {
    background: white;
    border: 2px solid #ddd;
    border-radius: 10px;
    padding: 15px;
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.answer-btn:hover:not([disabled]) {
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    border-color: var(--primary-color);
}

.answer-btn.correct {
    background: var(--correct);
    color: white;
}

.answer-btn.incorrect {
    background: var(--incorrect);
    color: white;
}

.controls {
    display: flex;
    justify-content: flex-end;
}

.next-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s ease;
}

.next-btn:hover {
    background: var(--secondary-color);
}

.score-container {
    text-align: center;
    font-size: 1.5rem;
    margin-top: 20px;
    display: none;
}

[disabled] {
    cursor: not-allowed;
    opacity: 0.7;
}

.explanation {
    margin-top: 20px;
    padding: 15px;
    background: #e8f4fc;
    border-radius: 8px;
    display: none;
}
.restart-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.3s ease;
    margin-top: 15px;
    display: block;
    width: 100%;
    max-width: 200px;
    margin: 20px auto 0;
}

.restart-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}