/* Custom animations and styles */
.animate-fade-in {
    animation: fadeIn 1s ease-in-out;
}

.animate-fade-in-delay {
    animation: fadeIn 1s ease-in-out 0.3s both;
}

.animate-bounce-in {
    animation: bounceIn 0.8s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Smooth transitions for dark mode */
.transition-colors {
    transition-property: background-color, border-color, color, fill, stroke;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    transition-duration: 300ms;
}

/* Hover effects for lesson cards */
.lesson-card {
    transition: all 0.3s ease;
}

.lesson-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.dark .lesson-card:hover {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

/* Progress bar animation */
#progress-bar {
    transition: width 0.5s ease-in-out;
}

/* Modal animations */
.modal-enter {
    animation: modalEnter 0.3s ease-out;
}

.modal-exit {
    animation: modalExit 0.3s ease-in;
}

@keyframes modalEnter {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes modalExit {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(0.9);
    }
}

/* Mobile menu animation */
.mobile-menu-enter {
    animation: slideDown 0.3s ease-out;
}

.mobile-menu-exit {
    animation: slideUp 0.3s ease-in;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-10px);
    }
}

/* Custom scrollbar for dark mode */
.dark ::-webkit-scrollbar {
    width: 8px;
}

.dark ::-webkit-scrollbar-track {
    background: #1f2937;
}

.dark ::-webkit-scrollbar-thumb {
    background: #4b5563;
    border-radius: 4px;
}

.dark ::-webkit-scrollbar-thumb:hover {
    background: #6b7280;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .hero-section {
        padding-top: 3rem;
        padding-bottom: 3rem;
    }
    
    .hero-section h2 {
        font-size: 2.5rem;
    }
}

/* Loading spinner */
.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Button hover effects */
.btn-hover-effect {
    transition: all 0.3s ease;
}

.btn-hover-effect:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* Card grid responsive */
@media (max-width: 640px) {
    #lessons-container {
        grid-template-columns: 1fr;
    }
}

/* Navigation link active state */
.nav-link.active {
    color: #3b82f6;
    font-weight: 600;
}

.dark .nav-link.active {
    color: #60a5fa;
}