:root {
    --drop-border-color: var(--bs-border-color);
    --drop-bg-color: var(--bs-body-bg);
    --drop-hover-bg: var(--bs-secondary-bg);
}

.drop-area {
    border: 2px dashed var(--drop-border-color);
    border-radius: 1rem;
    padding: 3rem 2rem;
    background-color: var(--drop-bg-color);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.drop-area:hover,
.drop-area.drag-over {
    border-color: var(--bs-primary);
    background-color: var(--drop-hover-bg);
    transform: translateY(-2px);
}

.drop-area.drag-over {
    border-style: solid;
    box-shadow: 0 8px 25px rgba(var(--bs-primary-rgb), 0.15);
}

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

.image-preview {
    border-radius: 0.5rem;
    overflow: hidden;
    background: var(--bs-secondary-bg);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-preview img {
    max-height: 300px;
    width: auto;
    object-fit: contain;
}

.preview-container {
    margin-bottom: 2rem;
}

.feature-item {
    padding: 1.5rem;
    border-radius: 0.5rem;
    transition: transform 0.2s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.supported-formats {
    padding: 1.5rem;
    background: var(--bs-secondary-bg);
    border-radius: 0.5rem;
}

.format-badges .badge {
    font-size: 0.8em;
    padding: 0.5em 0.8em;
}

/* Progress bar styling */
.progress {
    height: 8px;
    border-radius: 4px;
    background-color: var(--bs-secondary-bg);
}

.progress-bar {
    border-radius: 4px;
    transition: width 0.3s ease;
}

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

.processing {
    animation: pulse 2s infinite;
}

/* Card styling */
.card {
    background: var(--bs-body-bg);
    border: 1px solid var(--bs-border-color);
}

/* Button animations */
.btn {
    transition: all 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .drop-area {
        padding: 2rem 1rem;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .feature-item {
        padding: 1rem;
    }
}

/* File input styling */
#fileInput {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

/* Error states */
.error-state {
    border-color: var(--bs-danger) !important;
    background-color: rgba(var(--bs-danger-rgb), 0.1);
}

/* Success states */
.success-state {
    border-color: var(--bs-success) !important;
    background-color: rgba(var(--bs-success-rgb), 0.1);
}