:root {
    --primary-color: #4a90e2;
    --secondary-color: #f5f5f5;
    --error-color: #ff4444;
}

body {
    background-color: var(--secondary-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.drop-zone {
    border: 2px dashed #ccc;
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.drop-zone:hover {
    border-color: var(--primary-color);
    background-color: rgba(74, 144, 226, 0.05);
}

.drop-zone.drag-over, .drop-zone.dragover {
    border-color: var(--primary-color);
    background-color: rgba(74, 144, 226, 0.1);
}

.upload-prompt {
    pointer-events: none;
    position: relative;
    z-index: 1;
}

.upload-prompt i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-prompt p {
    margin: 0;
    color: #6c757d;
}

#file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

#model-viewer-container {
    width: 100%;
    height: 400px;
    position: relative;
    margin-top: 20px;
}

#three-canvas {
    width: 100%;
    height: 100%;
    border-radius: 8px;
    background-color: #1a1a1a;
}

.spinner-border {
    width: 3rem;
    height: 3rem;
}

#image-preview {
    max-height: 300px;
    object-fit: contain;
    border-radius: 8px;
    margin: 0 auto;
    display: block;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 0.5rem 1.5rem;
}

.btn-primary:hover {
    background-color: #357abd;
    border-color: #357abd;
}

.alert {
    margin-top: 1rem;
    display: none;
}

#loading-container {
    padding: 20px;
}

#error-container {
    display: none;
    margin-top: 20px;
}

#download-btn {
    width: 100%;
    margin-top: 10px;
    display: none;
}