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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

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

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

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

main {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
}

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

.tabs {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 2px solid #f0f0f0;
}

.tab-button {
    background: none;
    border: none;
    padding: 12px 24px;
    font-size: 1rem;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    color: #666;
    font-weight: 500;
}

.tab-button.active {
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-button:hover {
    color: #667eea;
    background: #f8f9ff;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

#json-input {
    width: 100%;
    min-height: 300px;
    padding: 20px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 14px;
    line-height: 1.5;
    resize: vertical;
    transition: border-color 0.3s ease;
    background: #fafafa;
}

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

.file-upload-area {
    border: 3px dashed #ddd;
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    background: #fafafa;
    transition: all 0.3s ease;
    cursor: pointer;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-upload-area:hover {
    border-color: #667eea;
    background: #f8f9ff;
}

.file-upload-area.dragover {
    border-color: #667eea;
    background: #f0f4ff;
    transform: scale(1.02);
}

.upload-content {
    pointer-events: none;
}

.upload-icon {
    width: 64px;
    height: 64px;
    fill: #ccc;
    margin-bottom: 20px;
    transition: fill 0.3s ease;
}

.file-upload-area:hover .upload-icon {
    fill: #667eea;
}

.upload-content p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 8px;
}

.upload-hint {
    font-size: 0.9rem !important;
    color: #999 !important;
}

.actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.generate-button, .example-button {
    padding: 15px 30px;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 180px;
    justify-content: center;
}

.generate-button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.generate-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.generate-button:active {
    transform: translateY(0);
}

.generate-button:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.example-button {
    background: #f8f9fa;
    color: #495057;
    border: 2px solid #e9ecef;
}

.example-button:hover {
    background: #e9ecef;
    border-color: #dee2e6;
}

.button-icon {
    font-size: 1.2rem;
}

.status-message {
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    text-align: center;
    font-weight: 500;
    display: none;
}

.status-message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.status-message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

.status-message.loading {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
    display: block;
}

footer {
    text-align: center;
    margin-top: 30px;
    color: white;
    opacity: 0.8;
}

footer p {
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    main {
        padding: 20px;
    }
    
    .actions {
        flex-direction: column;
        align-items: center;
    }
    
    .generate-button, .example-button {
        width: 100%;
        max-width: 300px;
    }
    
    #json-input {
        min-height: 250px;
        padding: 15px;
    }
    
    .file-upload-area {
        padding: 30px 20px;
        min-height: 250px;
    }
}

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

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 10px;
}

/* JSON Syntax Highlighting */
#json-input {
    background: #f8f9fa;
    color: #333;
}

#json-input:focus {
    background: white;
}

/* Info Section Styles */
.info-section {
    background: #f8f9ff;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 30px;
    border: 1px solid #e3e8ff;
}

.info-section h2 {
    color: #667eea;
    margin-bottom: 20px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.table-container {
    overflow-x: auto;
    margin-bottom: 25px;
}

.format-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.format-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 12px 8px;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
}

.format-table td {
    padding: 10px 8px;
    border-bottom: 1px solid #f0f0f0;
    font-size: 0.85rem;
    vertical-align: top;
}

.format-table tr:hover {
    background: #f8f9ff;
}

.format-table code {
    background: #f1f3f4;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.8rem;
    color: #d63384;
}

.tips-section {
    background: white;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #28a745;
}

.tips-section h3 {
    color: #28a745;
    margin-bottom: 15px;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tips-section ul {
    list-style: none;
    padding: 0;
}

.tips-section li {
    padding: 8px 0;
    border-bottom: 1px solid #f0f0f0;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.tips-section li:last-child {
    border-bottom: none;
}

.tips-section li::before {
    content: "💡";
    font-size: 1rem;
}

.tips-section strong {
    color: #495057;
}

.tips-section code {
    background: #f8f9fa;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.8rem;
    color: #d63384;
    border: 1px solid #e9ecef;
}

/* Responsive adjustments for info section */
@media (max-width: 768px) {
    .info-section {
        padding: 20px 15px;
    }
    
    .format-table th,
    .format-table td {
        padding: 8px 6px;
        font-size: 0.8rem;
    }
    
    .tips-section {
        padding: 15px;
    }
    
    .tips-section li {
        flex-direction: column;
        gap: 5px;
    }
}