:root {
    --primary-color: #4a4af4;
    --secondary-color: #7b68ee;
    --tertiary-color: #ff6b6b;
    --quaternary-color: #4ecdc4;
    --background-color: #f4f4f8;
    --text-color: #333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    perspective: 1000px;
}

.background-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color), var(--tertiary-color), var(--quaternary-color));
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
    opacity: 0.2;
    filter: blur(100px);
}

.background-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.05;
    background-image: 
        linear-gradient(to right, rgba(255,255,255,0.1) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 30px 30px;
    transform: rotate(15deg);
    animation: patternRotate 20s linear infinite;
}

.geometric-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
}

.geometric-shape {
    position: absolute;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
    animation: shapeTransform 10s ease-in-out infinite alternate;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes patternRotate {
    0% { transform: rotate(15deg); }
    100% { transform: rotate(375deg); }
}

@keyframes shapeTransform {
    0% { 
        transform: scale(0.5) rotate(0deg);
        opacity: 0.05;
    }
    50% { 
        transform: scale(1.2) rotate(180deg);
        opacity: 0.1;
    }
    100% { 
        transform: scale(0.7) rotate(360deg);
        opacity: 0.05;
    }
}

.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    opacity: 0.1;
    z-index: -1;
    animation: backgroundFlow 15s ease infinite;
}

@keyframes backgroundFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.quiz-container {
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    width: 500px;
    max-width: 95%;
    padding: 30px;
    position: relative;
    overflow: hidden;
    animation: containerEnter 0.5s ease;
}

@keyframes containerEnter {
    from { 
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.score-tracker {
    display: flex;
    gap: 20px;
    font-weight: 600;
}

.answer-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 20px;
}

.answer-btn {
    background-color: #f1f3f5;
    border: none;
    padding: 15px;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.answer-btn:hover {
    background-color: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

.answer-btn.correct {
    background-color: #2ecc71;
    color: white;
}

.answer-btn.incorrect {
    background-color: #e74c3c;
    color: white;
}

.hidden {
    display: none;
}

.btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    margin: 10px;
    transition: background-color 0.3s ease;
}

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

.result-screen {
    text-align: center;
    animation: resultEnter 0.5s ease;
}

@keyframes resultEnter {
    from { 
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}
/* Add these styles to your existing CSS */
.review-screen {
    display: none;
    animation: slideIn 0.5s ease;
}

.review-screen.hidden {
    display: none;
}

.review-questions-container {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 20px;
}

.review-item {
    background-color: #f9f9f9;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.review-item h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

.review-item .correct {
    color: #2ecc71;
    font-weight: bold;
}

.review-item .incorrect {
    color: #e74c3c;
    font-weight: bold;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}