* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

header .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

main {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.upload-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.upload-area {
    width: 100%;
    border: 3px dashed #667eea;
    border-radius: 15px;
    padding: 50px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #f8f9ff;
}

.upload-area:hover {
    border-color: #764ba2;
    background: #f0f2ff;
    transform: scale(1.01);
}

.upload-area.dragover {
    border-color: #764ba2;
    background: #e8ebff;
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 15px;
}

.upload-area p {
    font-size: 1.2rem;
    color: #333;
    margin-bottom: 10px;
}

.upload-area .file-types {
    font-size: 0.9rem;
    color: #666;
}

.preview-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.preview-container img {
    max-width: 100%;
    max-height: 400px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.btn {
    padding: 15px 40px;
    font-size: 1.1rem;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f0f0f0;
    color: #333;
}

.btn-secondary:hover {
    background: #e0e0e0;
}

.btn-success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(17, 153, 142, 0.4);
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Results Header */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.results-header h2 {
    margin: 0;
    color: #333;
}

/* Table Styles */
.table-container {
    overflow-x: auto;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0,0,0,0.05);
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    font-size: 0.95rem;
}

.results-table th, 
.results-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.results-table th {
    background-color: #f8f9ff;
    color: #667eea;
    font-weight: 700;
    white-space: nowrap;
    position: sticky;
    top: 0;
}

.results-table tbody tr:hover {
    background-color: #f0f4ff;
}

.results-table td {
    color: #333;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Specific column widths if needed */
.results-table td.file-name {
    font-weight: 600;
    color: #555;
    max-width: 150px;
}

.error-cell {
    color: #dc3545 !important;
    font-style: italic;
}

/* Preview Summary */
.file-list-summary {
    width: 100%;
    background: #f8f9ff;
    border-radius: 10px;
    margin-bottom: 15px;
    border: 1px dashed #667eea;
}

/* Actions area */
.actions {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.copy-feedback {
    margin-left: 15px;
    font-size: 0.9rem;
    color: #11998e;
}

.error-message {
    margin-top: 10px;
    padding: 10px 15px;
    background: #fee;
    border: 1px solid #fcc;
    border-radius: 8px;
    color: #c00;
    text-align: center;
    width: 100%;
    animation: fadeIn 0.3s ease;
}

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

footer {
    text-align: center;
    margin-top: 30px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    main {
        padding: 20px;
        border-radius: 15px;
    }
    
    .results-header {
        flex-direction: column;
        gap: 15px;
        align-items: center;
    }
    
    .results-table th, 
    .results-table td {
        padding: 10px;
        font-size: 0.85rem;
    }
}