.drop-zone {
    transition: all 0.3s ease;
    cursor: pointer;
}

.drop-zone:hover {
    border-color: var(--bs-primary) !important;
    background-color: rgba(var(--bs-primary-rgb), 0.1);
}

.drop-zone.drag-over {
    border-color: var(--bs-primary) !important;
    background-color: rgba(var(--bs-primary-rgb), 0.2);
    transform: scale(1.02);
}

.drop-zone-content {
    pointer-events: none;
}

.progress {
    border-radius: 10px;
    overflow: hidden;
}

.progress-bar {
    transition: width 0.6s ease;
}

.card {
    border: none;
    background-color: var(--bs-dark);
}

.card-body {
    background-color: var(--bs-dark);
}

.border-bottom:last-child {
    border-bottom: none !important;
}

.alert {
    border-radius: 10px;
}

.btn {
    border-radius: 8px;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-lg {
    padding: 12px 30px;
    font-size: 1.1rem;
}

.display-4 {
    font-weight: 600;
}

.lead {
    font-size: 1.2rem;
}

.text-primary {
    color: var(--bs-primary) !important;
}

.bg-dark {
    background-color: var(--bs-dark) !important;
}

.border-dashed {
    border-style: dashed !important;
}

.border-2 {
    border-width: 2px !important;
}

/* Custom scrollbar for file list */
#filesContainer {
    max-height: 300px;
    overflow-y: auto;
}

#filesContainer::-webkit-scrollbar {
    width: 8px;
}

#filesContainer::-webkit-scrollbar-track {
    background: var(--bs-dark);
}

#filesContainer::-webkit-scrollbar-thumb {
    background: var(--bs-secondary);
    border-radius: 4px;
}

#filesContainer::-webkit-scrollbar-thumb:hover {
    background: var(--bs-primary);
}

/* Loading animation */
@keyframes pulse {
    0% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
    100% {
        opacity: 1;
    }
}

.loading {
    animation: pulse 2s ease-in-out infinite;
}

/* File item hover effect */
.file-item:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.1);
}

/* Error state styling */
.alert-danger {
    background-color: rgba(var(--bs-danger-rgb), 0.1);
    border-color: var(--bs-danger);
    color: var(--bs-danger);
}

.alert-success {
    background-color: rgba(var(--bs-success-rgb), 0.1);
    border-color: var(--bs-success);
    color: var(--bs-success);
}

.alert-info {
    background-color: rgba(var(--bs-info-rgb), 0.1);
    border-color: var(--bs-info);
    color: var(--bs-info);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }
    
    .card-body {
        padding: 30px 20px !important;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .lead {
        font-size: 1.1rem;
    }
}