* {
    font-family: 'Poppins', sans-serif;
}

.gradient-bg {
    background: linear-gradient(135deg, #0f172a 0%, #1a1f3a 100%);
}

.card-glass {
    background: rgba(30, 41, 59, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(71, 85, 105, 0.4);
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    transition: all 0.3s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background: rgba(51, 65, 85, 0.5);
    transition: all 0.3s;
}

.btn-secondary:hover {
    background: rgba(71, 85, 105, 0.7);
}

.option-btn {
    transition: all 0.3s ease;
    border: 2px solid rgba(71, 85, 105, 0.5);
    background: rgba(30, 41, 59, 0.4);
}

.option-btn:hover {
    transform: translateY(-2px);
    border-color: rgba(59, 130, 246, 0.5);
    background: rgba(51, 65, 85, 0.5);
}

.option-btn.selected {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    border-color: transparent;
}

.option-btn.correct {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border-color: transparent;
}

.option-btn.wrong {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    border-color: transparent;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-in {
    animation: slideIn 0.5s ease forwards;
}

.scrollbar-thin::-webkit-scrollbar {
    width: 6px;
}

.scrollbar-thin::-webkit-scrollbar-track {
    background: rgba(71, 85, 105, 0.2);
}

.scrollbar-thin::-webkit-scrollbar-thumb {
    background: rgba(59, 130, 246, 0.5);
    border-radius: 3px;
}

.scrollbar-thin::-webkit-scrollbar-thumb:hover {
    background: rgba(59, 130, 246, 0.7);
}

svg {
    filter: drop-shadow(0 0 1px rgba(0, 0, 0, 0.4));
}