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

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #1a1a2e;
    color: #e0e0e0;
    padding: 2rem;
}

.container {
    background: rgba(30, 30, 50, 0.9);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 500px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #4f46e5, #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.difficulty-selector {
    margin: 1rem 0;
    display: flex;
    justify-content: center;
    gap: 0.5rem;
}

.difficulty-btn {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
}

.difficulty-btn.active {
    background: linear-gradient(45deg, #4f46e5, #7c3aed);
    color: white;
}

.emoji-display {
    font-size: 6rem;
    margin: 2rem 0;
    animation: bounce 1s infinite;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

.options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin: 2rem 0;
}

button {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem;
    border-radius: 0.5rem;
    color: #e0e0e0;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
}

.stats {
    display: flex;
    justify-content: space-around;
    margin: 1rem 0;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 0.5rem;
}

.timer, .score, .high-score {
    font-size: 1.2rem;
}

.high-scores-container {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 0.5rem;
    display: none;
}

.high-scores-container.show {
    display: block;
}

.high-scores-list {
    list-style: none;
    margin-top: 1rem;
}

.high-scores-list li {
    padding: 0.5rem;
    margin: 0.5rem 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 0.3rem;
    display: flex;
    justify-content: space-between;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    

    50% {
        transform: translateY(-10px);
    }
}

.feedback {
    font-size: 1.2rem;
    margin-top: 1rem;
    min-height: 1.5rem;
}

.correct {
    color: #4ade80;
}

.incorrect {
    color: #f87171;
}

.streak-bonus {
    font-size: 0.9rem;
    color: #fcd34d;
    margin-top: 0.5rem;
}

.new-high-score {
    color: #fcd34d;
    font-size: 1.4rem;
    margin-top: 1rem;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    
    50% {
        opacity: 0.5;
    }
}