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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 800px;
    width: 100%;
}

h1 {
    color: #667eea;
    text-align: center;
    margin-bottom: 30px;
    font-size: 2em;
}

.question-container {
    margin-bottom: 20px;
}

.question {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 15px;
    margin-bottom: 25px;
    border-left: 5px solid #667eea;
}

.question p {
    color: #333;
    line-height: 1.8;
    margin-bottom: 15px;
    font-size: 1.1em;
}

.question p:last-child {
    margin-bottom: 0;
}

.instruction {
    margin-top: 20px;
    font-weight: 600;
    color: #667eea;
}

.choices {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.choice-btn {
    background: white;
    border: 3px solid #667eea;
    padding: 20px;
    border-radius: 15px;
    font-size: 1.1em;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    display: flex;
    align-items: center;
    color: #333;
}

.choice-btn:hover {
    background: #f0f4ff;
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.choice-btn:active {
    transform: translateY(-3px) scale(0.98);
}

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

.choice-btn.correct {
    background: #4caf50;
    border-color: #4caf50;
    color: white;
    animation: correctPulse 0.5s ease;
}

.choice-btn.incorrect {
    background: #f44336;
    border-color: #f44336;
    color: white;
    animation: shake 0.5s ease;
}

.choice-letter {
    font-weight: bold;
    color: #667eea;
    margin-right: 10px;
    font-size: 1.2em;
}

.choice-btn.correct .choice-letter,
.choice-btn.incorrect .choice-letter {
    color: white;
}

.feedback {
    margin-top: 25px;
    padding: 20px;
    border-radius: 15px;
    text-align: center;
    font-size: 1.2em;
    font-weight: bold;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feedback.try-again {
    background: #fff3cd;
    color: #856404;
    border: 2px solid #ffc107;
}

.feedback.correct {
    background: #d4edda;
    color: #155724;
    border: 2px solid #4caf50;
}

.feedback.revealed {
    background: #d1ecf1;
    color: #0c5460;
    border: 2px solid #17a2b8;
}

.button-container {
    text-align: center;
    margin-top: 20px;
}

.reset-btn {
    padding: 15px 40px;
    font-size: 1.2em;
    font-weight: bold;
    color: white;
    background: linear-gradient(135deg, #f44336 0%, #e91e63 100%);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(244, 67, 54, 0.3);
}

.reset-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(244, 67, 54, 0.4);
}

.reset-btn:active {
    transform: translateY(0);
}

@keyframes correctPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

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

/* Clapping Animation */
.clapping-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    display: none;
}

.clapping-container.active {
    display: block;
}

.clap {
    position: absolute;
    font-size: 3em;
    animation: clapping 2s ease-out forwards;
    opacity: 0;
}

.clap:nth-child(1) { left: 10%; animation-delay: 0s; }
.clap:nth-child(2) { left: 20%; animation-delay: 0.1s; }
.clap:nth-child(3) { left: 30%; animation-delay: 0.2s; }
.clap:nth-child(4) { left: 40%; animation-delay: 0.3s; }
.clap:nth-child(5) { left: 50%; animation-delay: 0.4s; }
.clap:nth-child(6) { left: 60%; animation-delay: 0.5s; }
.clap:nth-child(7) { left: 70%; animation-delay: 0.6s; }
.clap:nth-child(8) { left: 80%; animation-delay: 0.7s; }
.clap:nth-child(9) { left: 90%; animation-delay: 0.8s; }
.clap:nth-child(10) { left: 50%; animation-delay: 0.9s; }

@keyframes clapping {
    0% {
        bottom: -10%;
        opacity: 0;
        transform: scale(0.5) rotate(0deg);
    }
    50% {
        opacity: 1;
        transform: scale(1.2) rotate(180deg);
    }
    100% {
        bottom: 110%;
        opacity: 0;
        transform: scale(0.8) rotate(360deg);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 25px;
    }

    h1 {
        font-size: 1.5em;
    }

    .question p {
        font-size: 1em;
    }

    .choices {
        grid-template-columns: 1fr;
    }

    .choice-btn {
        padding: 15px;
        font-size: 1em;
    }

    .clap {
        font-size: 2em;
    }
}