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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    padding-bottom: 80px;
    background-color: #f8f9fa;
}

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header h1 {
    margin: 0;
    font-size: 2em;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    margin-top: 15px;
}

nav ul li {
    display: inline;
    margin-right: 10px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 10px 15px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

nav ul li a:hover,
nav ul li a.active {
    background-color: #555;
}

main {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
}

.description {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    text-align: left;
}

.description p {
    margin: 0;
    color: #666;
    font-size: 1.1em;
}

/* Flash Messages */
.flash-messages {
    margin-bottom: 20px;
}

.flash-message {
    padding: 12px 20px;
    border-radius: 5px;
    margin-bottom: 10px;
    font-weight: 500;
}

.flash-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.flash-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.flash-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Crosswalk Sections */
.crosswalk-section {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    overflow: hidden;
}

.crosswalk-section h2 {
    background-color: #007bff;
    color: white;
    padding: 20px;
    margin: 0;
    font-size: 1.4em;
}

/* Batch Container */
.batch-container {
    padding: 30px;
}

.step-container {
    background-color: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 20px;
}

.step-container:last-child {
    margin-bottom: 0;
}

.step-container h3 {
    color: #333;
    margin-bottom: 20px;
    font-size: 1.2em;
    border-bottom: 2px solid #007bff;
    padding-bottom: 8px;
}

/* Form Styling */
.upload-form,
.conversion-form,
.interactive-form {
    max-width: 100%;
}

.file-input-container {
    position: relative;
    margin-bottom: 15px;
}

.file-input-container input[type="file"] {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-label {
    display: block;
    background-color: #007bff;
    color: white;
    padding: 12px 20px;
    border-radius: 5px;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s ease;
    border: 2px dashed #007bff;
}

.file-label:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

.file-requirements {
    background-color: #e7f3ff;
    border: 1px solid #b3d7ff;
    border-radius: 5px;
    padding: 12px;
    margin-bottom: 15px;
}

.file-requirements p {
    margin: 0;
    color: #004085;
    font-size: 0.9em;
}

/* Conversion Grid */
.conversion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
}

.form-group select,
.form-group input[type="text"] {
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.form-group select:focus,
.form-group input[type="text"]:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0,123,255,0.25);
}

.file-info {
    background-color: #e7f3ff;
    border: 1px solid #b3d7ff;
    border-radius: 5px;
    padding: 15px;
    margin-bottom: 20px;
}

.file-info p {
    margin: 0;
    color: #004085;
    font-weight: 500;
}

/* Buttons */
.upload-btn,
.process-btn,
.download-btn,
.convert-btn {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    min-width: 160px;
}

.upload-btn:hover,
.process-btn:hover,
.download-btn:hover,
.convert-btn:hover {
    background-color: #0056b3;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0,123,255,0.3);
}

.download-btn {
    background-color: #28a745;
}

.download-btn:hover {
    background-color: #1e7e34;
}

/* Processing Success */
.processing-success {
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: 5px;
    padding: 20px;
    margin-bottom: 20px;
}

.processing-success p {
    margin: 5px 0;
    color: #155724;
    font-weight: 500;
}

.download-container {
    text-align: center;
}

/* Interactive Container */
.interactive-container {
    padding: 30px;
}

/* Results Container */
.results-container {
    background-color: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    padding: 25px;
    margin-top: 25px;
}

.results-container h3 {
    color: #333;
    margin-bottom: 20px;
    border-bottom: 2px solid #007bff;
    padding-bottom: 8px;
}

.results-table table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.results-table th,
.results-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #dee2e6;
}

.results-table th {
    background-color: #007bff;
    color: white;
    font-weight: 600;
}

.results-table tr:nth-child(even) {
    background-color: #f8f9fa;
}

.results-table tr:hover {
    background-color: #e7f3ff;
}

/* Messages */
.error-message {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    border-radius: 5px;
    padding: 15px;
    margin: 10px 0;
}

.info-message {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
    border-radius: 5px;
    padding: 15px;
    margin: 10px 0;
}

/* Footer */
footer {
    background-color: #333;
    color: #fff;
    padding: 15px 0;
    position: fixed;
    bottom: 0;
    width: 100%;
    z-index: 1000;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.footer-section {
    margin: 0;
}

.footer-section p {
    margin: 0;
    font-size: 14px;
}

.contact-info a {
    color: #4CAF50;
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-info a:hover {
    color: #66BB6A;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    main {
        padding: 0 15px;
    }
    
    .conversion-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .step-container {
        padding: 20px;
    }
    
    .batch-container,
    .interactive-container {
        padding: 20px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    nav ul li {
        display: block;
        margin: 5px 0;
    }
    
    header h1 {
        font-size: 1.5em;
    }
}

/* Interactive Form Enhancements */
.section-description {
    background-color: #f8f9fa;
    border-left: 4px solid #007bff;
    padding: 15px;
    margin-bottom: 20px;
    color: #495057;
    font-style: italic;
}

.conversion-setup {
    margin-bottom: 20px;
}

.conversion-step {
    background-color: #fff;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.conversion-step h3 {
    color: #007bff;
    margin-bottom: 15px;
    font-size: 1.1em;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 8px;
}

.help-text {
    display: block;
    color: #6c757d;
    font-size: 0.85em;
    margin-top: 5px;
    font-style: italic;
}

.form-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #dee2e6;
}

.convert-btn {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.convert-btn:hover:not(:disabled) {
    background-color: #218838;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.convert-btn:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
    opacity: 0.6;
}

.reset-btn {
    background-color: #6c757d;
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    transition: all 0.3s ease;
}

.reset-btn:hover {
    background-color: #5a6268;
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .form-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .convert-btn, .reset-btn {
        width: 100%;
        max-width: 250px;
    }
}

@media (max-width: 480px) {
    .conversion-grid {
        grid-template-columns: 1fr;
    }
    
    .upload-btn,
    .process-btn,
    .download-btn,
    .convert-btn {
        width: 100%;
        min-width: auto;
    }
}