/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Rajdhani:wght@300;400;500;600;700&display=swap');

/* CSS Variables */
:root {
    --primary-bg: linear-gradient(135deg, #0c0c0c 0%, #1a0033 50%, #0d1117 100%);
    --secondary-bg: rgba(25, 25, 40, 0.9);
    --accent-cyan: #00ffff;
    --accent-purple: #8b5cf6;
    --accent-lime: #32ff32;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --error-red: #ff3366;
    --success-green: #00ff88;
    --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.5);
    --border-glow: 1px solid rgba(0, 255, 255, 0.3);
}

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

body {
    font-family: 'Rajdhani', sans-serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Animated Background Stars */
.stars {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.stars::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, var(--accent-cyan), transparent),
        radial-gradient(2px 2px at 40px 70px, var(--accent-purple), transparent),
        radial-gradient(1px 1px at 90px 40px, var(--accent-lime), transparent),
        radial-gradient(1px 1px at 130px 80px, var(--accent-cyan), transparent),
        radial-gradient(2px 2px at 160px 30px, var(--accent-purple), transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: sparkle 20s linear infinite;
}

@keyframes sparkle {
    from { transform: translateY(0px); }
    to { transform: translateY(-100px); }
}

/* Progress Bar */
.progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple), var(--accent-lime));
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 4px;
    height: 100%;
    background: white;
    box-shadow: 0 0 10px var(--accent-cyan);
}

.progress-text {
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 14px;
    color: var(--text-secondary);
    z-index: 1001;
}

/* Quiz Container */
.quiz-container {
    position: relative;
    z-index: 10;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* Welcome Screen */
.welcome-screen {
    text-align: center;
    max-width: 600px;
    animation: fadeInUp 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.quiz-title {
    font-family: 'Orbitron', monospace;
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 20px;
    background: linear-gradient(45deg, var(--accent-cyan), var(--accent-purple), var(--accent-lime));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: glow 2s ease-in-out infinite alternate;
}

.quiz-title i {
    margin-right: 15px;
    color: var(--accent-cyan);
}

.quiz-subtitle {
    font-size: 1.4rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-weight: 400;
}

.quiz-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 50px;
    gap: 20px;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    background: var(--secondary-bg);
    border-radius: 15px;
    border: var(--border-glow);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.stat:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.stat i {
    font-size: 2rem;
    color: var(--accent-purple);
    margin-bottom: 10px;
}

.stat span {
    font-weight: 500;
    color: var(--text-primary);
}

/* Buttons */
.start-btn, .restart-btn, .share-btn {
    background: linear-gradient(45deg, var(--accent-purple), var(--accent-cyan));
    border: none;
    padding: 18px 40px;
    font-size: 1.3rem;
    font-weight: 600;
    font-family: 'Orbitron', monospace;
    color: white;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.start-btn:hover, .restart-btn:hover, .share-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.5);
}

.start-btn:active, .restart-btn:active, .share-btn:active {
    transform: scale(0.98);
}

.start-btn i, .restart-btn i, .share-btn i {
    margin-right: 10px;
}

/* Quiz Screen */
.quiz-screen {
    max-width: 800px;
    width: 100%;
    animation: slideInRight 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.question-container {
    background: var(--secondary-bg);
    border-radius: 20px;
    padding: 40px;
    border: var(--border-glow);
    backdrop-filter: blur(15px);
    box-shadow: var(--shadow-glow);
}

.question-text {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 30px;
    line-height: 1.6;
    color: var(--text-primary);
    text-align: center;
}

.options-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
}

.option-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 20px;
    border-radius: 15px;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    position: relative;
    backdrop-filter: blur(5px);
}

.option-btn:hover {
    background: rgba(139, 92, 246, 0.2);
    border-color: var(--accent-purple);
    transform: translateX(10px);
}

.option-btn.correct {
    background: rgba(0, 255, 136, 0.2);
    border-color: var(--success-green);
    animation: correctGlow 0.6s ease;
}

.option-btn.incorrect {
    background: rgba(255, 51, 102, 0.2);
    border-color: var(--error-red);
    animation: incorrectShake 0.6s ease;
}

.option-btn.disabled {
    pointer-events: none;
    opacity: 0.6;
}

/* Results Screen */
.results-screen {
    max-width: 700px;
    width: 100%;
    text-align: center;
    animation: zoomIn 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.results-content {
    background: var(--secondary-bg);
    border-radius: 25px;
    padding: 50px 40px;
    border: var(--border-glow);
    backdrop-filter: blur(15px);
    box-shadow: var(--shadow-glow);
}

.score-circle {
    width: 200px;
    height: 200px;
    border: 4px solid var(--accent-purple);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 30px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(0, 255, 255, 0.1));
    position: relative;
    animation: pulseGlow 2s ease-in-out infinite;
}

.score-number {
    font-family: 'Orbitron', monospace;
    font-size: 4rem;
    font-weight: 900;
    color: var(--accent-cyan);
    line-height: 1;
}

.score-total {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 300;
}

.results-title {
    font-family: 'Orbitron', monospace;
    font-size: 2.5rem;
    margin-bottom: 15px;
    background: linear-gradient(45deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results-message {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.5;
}

.results-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 40px;
    gap: 20px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    flex: 1;
}

.stat-item i {
    font-size: 1.5rem;
    margin-bottom: 8px;
    color: var(--accent-lime);
}

.results-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(10px);
}

.loading-spinner {
    font-size: 4rem;
    color: var(--accent-cyan);
    animation: spin 2s linear infinite;
    margin-bottom: 20px;
}

.loading-screen p {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* Keyframe Animations */
@keyframes glow {
    from { filter: drop-shadow(0 0 20px rgba(0, 255, 255, 0.5)); }
    to { filter: drop-shadow(0 0 30px rgba(139, 92, 246, 0.8)); }
}

@keyframes fadeInUp {
    from { 
        opacity: 0; 
        transform: translateY(30px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes slideInRight {
    from { 
        opacity: 0; 
        transform: translateX(50px); 
    }
    to { 
        opacity: 1; 
        transform: translateX(0); 
    }
}

@keyframes slideInLeft {
    from { 
        opacity: 0; 
        transform: translateX(-50px); 
    }
    to { 
        opacity: 1; 
        transform: translateX(0); 
    }
}

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

@keyframes correctGlow {
    0% { box-shadow: 0 0 0 rgba(0, 255, 136, 0.5); }
    50% { box-shadow: 0 0 30px rgba(0, 255, 136, 0.8); }
    100% { box-shadow: 0 0 15px rgba(0, 255, 136, 0.6); }
}

@keyframes incorrectShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

@keyframes pulseGlow {
    0%, 100% { 
        box-shadow: 0 0 20px rgba(139, 92, 246, 0.5); 
        transform: scale(1);
    }
    50% { 
        box-shadow: 0 0 40px rgba(0, 255, 255, 0.8); 
        transform: scale(1.02);
    }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .quiz-title {
        font-size: 2.5rem;
    }
    
    .quiz-subtitle {
        font-size: 1.1rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 15px;
    }
    
    .question-container {
        padding: 25px;
        margin: 0 10px;
    }
    
    .question-text {
        font-size: 1.4rem;
    }
    
    .option-btn {
        padding: 15px;
        font-size: 1rem;
    }
    
    .results-content {
        padding: 30px 20px;
        margin: 0 10px;
    }
    
    .score-circle {
        width: 150px;
        height: 150px;
    }
    
    .score-number {
        font-size: 3rem;
    }
    
    .results-title {
        font-size: 2rem;
    }
    
    .results-stats {
        flex-direction: column;
        gap: 10px;
    }
    
    .results-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .restart-btn, .share-btn {
        width: 100%;
        max-width: 250px;
    }
}

@media (max-width: 480px) {
    .quiz-container {
        padding: 10px;
    }
    
    .quiz-title {
        font-size: 2rem;
    }
    
    .question-container {
        padding: 20px;
    }
    
    .question-text {
        font-size: 1.2rem;
    }
    
    .start-btn {
        padding: 15px 30px;
        font-size: 1.1rem;
    }
}

/* Screen transitions */
.screen-transition-out {
    animation: slideOutLeft 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.screen-transition-in {
    animation: slideInRight 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes slideOutLeft {
    from { 
        opacity: 1; 
        transform: translateX(0); 
    }
    to { 
        opacity: 0; 
        transform: translateX(-100px); 
    }
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-purple);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-cyan);
}