/* File Upload Container */
.file-upload-container {
    margin-bottom: 2rem;
}

.file-upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    padding: 3rem 2rem;
    text-align: center;
    background: var(--bg-primary);
    transition: all 0.3s ease;
    cursor: pointer;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-upload-zone:hover {
    border-color: var(--primary-color);
    background: var(--primary-color-alpha);
}

.file-upload-zone.drag-over {
    border-color: var(--primary-color);
    background: var(--primary-color-alpha);
    transform: scale(1.02);
    box-shadow: var(--shadow-medium);
}

.file-upload-zone.uploading {
    cursor: default;
    border-color: var(--primary-color);
}

/* Upload Placeholder */
.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.upload-icon {
    font-size: 4rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.upload-icon.uploading {
    color: var(--primary-color);
    animation: uploadPulse 2s infinite;
}

@keyframes uploadPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.7; }
}

.upload-icon .material-icons {
    font-size: 4rem;
}

.upload-text h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.upload-text p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Upload Progress */
.upload-progress-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    width: 100%;
    max-width: 400px;
}

.upload-details {
    width: 100%;
}

.upload-details h4 {
    margin: 0 0 1rem 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
    animation: progressShimmer 2s infinite;
}

@keyframes progressShimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Upload Success */
.upload-success {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.success-icon {
    font-size: 4rem;
    color: var(--success-color);
    animation: successPulse 0.6s ease-out;
}

@keyframes successPulse {
    0% { transform: scale(0.8); opacity: 0; }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

.success-icon .material-icons {
    font-size: 4rem;
}

.success-details {
    text-align: center;
}

.success-details h4 {
    margin: 0 0 1rem 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--success-color);
}

.file-info {
    margin-bottom: 1.5rem;
}

.file-info p {
    margin: 0.25rem 0;
    color: var(--text-secondary);
}

.file-info p:first-child {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
}

/* Upload Error */
.upload-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.error-icon {
    font-size: 4rem;
    color: var(--error-color);
    animation: errorShake 0.6s ease-out;
}

@keyframes errorShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.error-icon .material-icons {
    font-size: 4rem;
}

.error-details {
    text-align: center;
}

.error-details h4 {
    margin: 0 0 0.5rem 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--error-color);
}

.error-details p {
    margin: 0 0 1.5rem 0;
    color: var(--text-secondary);
}

/* File Preview Section */
.file-preview-section {
    margin-top: 2rem;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-small);
    border: 1px solid var(--border-light);
    animation: slideUp 0.4s ease-out;
}

.preview-header {
    margin-bottom: 1.5rem;
}

.preview-header h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0 0 0.5rem 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.preview-header h3 .material-icons {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.preview-header p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Preview Grid */
.preview-grid-container {
    max-height: 600px;
    overflow: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
}

.preview-grid {
    display: table;
    width: 100%;
    border-collapse: collapse;
}

.grid-header {
    display: table-header-group;
    position: sticky;
    top: 0;
    background: var(--bg-tertiary);
    z-index: 10;
}

.grid-header-cell {
    display: table-cell;
    padding: 0.75rem 1rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    white-space: nowrap;
    min-width: 120px;
    text-align: left;
    font-size: 0.875rem;
}

.grid-header-cell:last-child {
    border-right: none;
}

.grid-body {
    display: table-row-group;
}

.grid-row {
    display: table-row;
    transition: background-color 0.2s ease;
}

.grid-row:hover {
    background: var(--bg-tertiary);
}

.grid-row:nth-child(even) {
    background: var(--bg-secondary);
}

.grid-row:nth-child(even):hover {
    background: var(--bg-tertiary);
}

.grid-cell {
    display: table-cell;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-light);
    border-right: 1px solid var(--border-light);
    color: var(--text-primary);
    font-size: 0.875rem;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    vertical-align: top;
}

.grid-cell:last-child {
    border-right: none;
}

/* Custom scrollbar for preview grid */
.preview-grid-container::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.preview-grid-container::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

.preview-grid-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.preview-grid-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .file-upload-zone {
        padding: 2rem 1rem;
        min-height: 150px;
    }
    
    .upload-icon .material-icons {
        font-size: 3rem;
    }
    
    .upload-text h3 {
        font-size: 1.25rem;
    }
    
    .upload-text p {
        font-size: 0.875rem;
    }
    
    .upload-progress-container {
        max-width: 300px;
    }
    
    .upload-details h4 {
        font-size: 1.1rem;
    }
    
    .file-preview-section {
        padding: 1rem;
    }
    
    .preview-grid-container {
        max-height: 400px;
    }
    
    .grid-header-cell,
    .grid-cell {
        padding: 0.5rem;
        min-width: 100px;
        max-width: 150px;
        font-size: 0.75rem;
    }
    
    .progress-info {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .upload-placeholder {
        gap: 1rem;
    }
    
    .upload-icon .material-icons {
        font-size: 2.5rem;
    }
    
    .upload-text h3 {
        font-size: 1.1rem;
    }
    
    .grid-header-cell,
    .grid-cell {
        min-width: 80px;
        max-width: 120px;
    }
}