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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(45deg, #ff006e, #8338ec, #3a86ff, #06ffa5);
    background-size: 400% 400%;
    animation: gradientShift 3s ease infinite;
    overflow-x: hidden;
    color: white;
}

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

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
}

.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.particle {
    position: absolute;
    background: white;
    border-radius: 50%;
    opacity: 0.6;
    animation: float 6s linear infinite;
}

@keyframes float {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10%, 90% {
        opacity: 0.6;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

.quiz-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 30px;
    padding: 40px;
    max-width: 600px;
    width: 100%;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transform: scale(0);
    animation: popIn 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
    position: relative;
    z-index: 10;
}

@keyframes popIn {
    to {
        transform: scale(1);
    }
}

.title {
    font-size: 3rem;
    font-weight: bold;
    margin-bottom: 10px;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from {
        text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
    }
    to {
        text-shadow: 0 0 30px rgba(255, 255, 255, 0.8), 0 0 40px rgba(255, 106, 110, 0.5);
    }
}

.question {
    font-size: 1.5rem;
    margin: 30px 0;
    font-weight: 500;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin: 30px 0;
}

.option {
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
    border: 2px solid transparent;
    border-radius: 15px;
    padding: 15px 20px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.option:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: rgba(255, 255, 255, 0.5);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.option:hover::before {
    left: 100%;
}

.option.selected {
    background: linear-gradient(45deg, #ff006e, #8338ec);
    border-color: white;
    transform: scale(1.05);
}

.option.correct {
    background: linear-gradient(45deg, #06ffa5, #00d4aa);
    animation: correctPulse 0.6s ease;
}

.option.incorrect {
    background: linear-gradient(45deg, #ff4757, #ff3838);
    animation: shake 0.6s ease;
}

@keyframes correctPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

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

.btn {
    background: linear-gradient(45deg, #ff006e, #8338ec);
    border: none;
    border-radius: 50px;
    padding: 15px 40px;
    font-size: 1.2rem;
    font-weight: bold;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 20px 10px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:active {
    transform: translateY(-1px);
}

.score {
    font-size: 2rem;
    font-weight: bold;
    margin: 20px 0;
    animation: bounce 1s ease infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.progress-bar {
    width: 100%;
    height: 10px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    margin: 20px 0;
    overflow: hidden;
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, #06ffa5, #3a86ff);
    border-radius: 10px;
    transition: width 0.5s ease;
    animation: progressGlow 2s ease infinite;
}

@keyframes progressGlow {
    0%, 100% { box-shadow: 0 0 10px rgba(6, 255, 165, 0.5); }
    50% { box-shadow: 0 0 20px rgba(6, 255, 165, 0.8); }
}

.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    background: #ff006e;
    animation: confetti-fall 3s linear infinite;
}

@keyframes confetti-fall {
    0% {
        transform: translateY(-100vh) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

.hidden {
    display: none;
}

.firework {
    position: fixed;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    animation: firework 1s ease-out forwards;
}

@keyframes firework {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    100% {
        transform: scale(20);
        opacity: 0;
    }
}