body {
    font-family: 'Inter', sans-serif;
    background-color: #111827; /* bg-gray-900 */
    color: #F9FAFB; /* text-gray-50 */
}
.hero-bg {
    background-image: linear-gradient(rgba(17, 24, 39, 0.8), rgba(17, 24, 39, 1)), url('https://placehold.co/1920x1080/000000/FFFFFF?text=Audiolivros');
    background-size: cover;
    background-position: center;
}
.card-hover-effect {
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
}
.card-hover-effect:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(249, 115, 22, 0.2), 0 10px 10px -5px rgba(249, 115, 22, 0.1);
}
.modal-backdrop {
    transition: opacity 0.3s ease-in-out;
}
.modal-content {
    transition: transform 0.3s ease-in-out;
}
/* Custom scrollbar for better aesthetics */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #1F2937; /* bg-gray-800 */
}
::-webkit-scrollbar-thumb {
    background: #4B5563; /* bg-gray-600 */
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: #6B7280; /* bg-gray-500 */
}

/* Accessibility utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Active Category Style */
.category-card.active {
    outline: 2px solid #F97316; /* ring-orange-500 */
    background-color: rgba(249, 115, 22, 0.1);
}

/* Skeleton Loader */
.skeleton {
    background-color: #1F2937; /* bg-gray-800 */
    position: relative;
    overflow: hidden;
}
.skeleton::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    transform: translateX(-100%);
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
    animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
    100% {
        transform: translateX(100%);
    }
}

/* Academic Notice Toast */
#academic-notice {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease-in-out, transform 0.5s ease-in-out;
}
#academic-notice.show-notice {
    opacity: 1;
    transform: translateY(0);
}