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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

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

main {
    flex: 1;
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-bottom: 20px;
}

.search-section {
    margin-bottom: 30px;
}

.input-group {
    display: flex;
    gap: 10px;
    max-width: 400px;
    margin: 0 auto;
}

#hsnInput {
    flex: 1;
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1.1rem;
    text-align: center;
    letter-spacing: 2px;
    transition: border-color 0.3s ease;
}

#hsnInput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

#searchBtn {
    padding: 15px 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#searchBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

#searchBtn:active {
    transform: translateY(0);
}

.error-message {
    color: #e74c3c;
    text-align: center;
    margin-top: 10px;
    font-weight: 500;
    display: none;
}

.loading {
    text-align: center;
    padding: 40px;
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.results-section {
    display: none;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #eee;
}

.results-header h2 {
    color: #333;
    font-size: 1.8rem;
}

.results-count {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 500;
}

.files-list {
    margin-bottom: 30px;
}

.file-item {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 15px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.file-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.file-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.file-name {
    font-weight: 600;
    color: #333;
    font-size: 1.1rem;
}

.record-count {
    background: #28a745;
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.9rem;
}

.file-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.download-btn {
    background: #28a745;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

.download-btn:hover {
    background: #218838;
}

.preview-btn {
    background: #17a2b8;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

.preview-btn:hover {
    background: #138496;
}

.bulk-actions {
    text-align: center;
    padding-top: 20px;
    border-top: 2px solid #eee;
}

.download-all-btn {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.download-all-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(40, 167, 69, 0.4);
}

.no-results {
    text-align: center;
    padding: 60px 20px;
    display: none;
}

.no-results-icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.no-results h3 {
    color: #666;
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.no-results p {
    color: #888;
    margin-bottom: 10px;
}

footer {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    color: white;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.stats p {
    margin: 5px 0;
    font-weight: 500;
}

.stats span {
    font-weight: 700;
    color: #ffd700;
}

/* Preview Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 20px;
    border-radius: 10px;
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #eee;
}

.close {
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: #000;
}

.preview-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

.preview-table th,
.preview-table td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
    font-size: 0.9rem;
}

.preview-table th {
    background-color: #f8f9fa;
    font-weight: 600;
    position: sticky;
    top: 0;
}

.preview-table tr:nth-child(even) {
    background-color: #f9f9f9;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 20px;
    }
    
    .input-group {
        flex-direction: column;
        max-width: 100%;
    }
    
    .results-header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .file-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .file-actions {
        justify-content: center;
    }
    
    .stats {
        flex-direction: column;
        gap: 10px;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 15px;
    }
    
    .preview-table {
        font-size: 0.8rem;
    }
    
    .preview-table th,
    .preview-table td {
        padding: 6px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    .file-actions {
        flex-direction: column;
    }
    
    .preview-table th,
    .preview-table td {
        padding: 4px;
        font-size: 0.7rem;
    }
}