:root {
            --primary-color: #2c3e50;
            --secondary-color: #34495e;
            --accent-color: #3498db;
            --text-color: #2c3e50;
            --text-light: #7f8c8d;
            --bg-color: #ffffff;
            --bg-light: #f8f9fa;
            --border-color: #e9ecef;
            --success-color: #27ae60;
            --warning-color: #f39c12;
            --error-color: #e74c3c;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--bg-color);
        }

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

        /* Header */
        .header {
            background-color: var(--bg-color);
            border-bottom: 1px solid var(--border-color);
            padding: 20px 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header h1 {
            font-size: 2rem;
            font-weight: 300;
            color: var(--primary-color);
            text-align: center;
            margin-bottom: 20px;
        }

        /* Navigation Tabs */
        .nav-tabs {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 0;
        }

        .tab-button {
            padding: 12px 24px;
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-light);
        }

        .tab-button:hover {
            background-color: var(--accent-color);
            color: white;
            transform: translateY(-1px);
        }

        .tab-button.active {
            background-color: var(--primary-color);
            color: white;
        }

        /* Main Content */
        .main-content {
            padding: 40px 0;
        }

        .tool-section {
            display: none;
            animation: fadeIn 0.3s ease-in;
        }

        .tool-section.active {
            display: block;
        }

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

        .tool-header {
            text-align: center;
            margin-bottom: 40px;
        }

        .tool-header h2 {
            font-size: 2.5rem;
            font-weight: 300;
            color: var(--primary-color);
            margin-bottom: 15px;
        }

        .tool-header p {
            font-size: 1.1rem;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }

        /* Forms */
        .form-group {
            margin-bottom: 25px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--text-color);
        }

        .form-group input,
        .form-group select,
        .form-group textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }

        .form-group input:focus,
        .form-group select:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--accent-color);
        }

        .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }

        /* Buttons */
        .btn {
            padding: 12px 24px;
            border: none;
            border-radius: 6px;
            font-size: 1rem;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
            text-align: center;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: white;
        }

        .btn-primary:hover {
            background-color: var(--secondary-color);
            transform: translateY(-1px);
        }

        .btn-secondary {
            background-color: var(--bg-light);
            color: var(--text-color);
            border: 1px solid var(--border-color);
        }

        .btn-secondary:hover {
            background-color: var(--border-color);
        }

        .btn-success {
            background-color: var(--success-color);
            color: white;
        }

        .btn-warning {
            background-color: var(--warning-color);
            color: white;
        }

        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }

        /* Results */
        .result-container {
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 25px;
            margin-top: 30px;
        }

        .result-container h3 {
            margin-bottom: 15px;
            color: var(--primary-color);
        }

        .result-content {
            background-color: white;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 20px;
            min-height: 200px;
            white-space: pre-wrap;
            word-wrap: break-word;
        }

        /* Loading States */
        .loading {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid var(--border-color);
            border-radius: 50%;
            border-top-color: var(--accent-color);
            animation: spin 1s ease-in-out infinite;
        }

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

        /* Chat Interface */
        .chat-container {
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            height: 400px;
            display: flex;
            flex-direction: column;
        }

        .chat-messages {
            flex: 1;
            padding: 20px;
            overflow-y: auto;
            background-color: white;
        }

        .chat-message {
            margin-bottom: 15px;
            display: flex;
        }

        .chat-message.user {
            justify-content: flex-end;
        }

        .message-bubble {
            max-width: 70%;
            padding: 12px 16px;
            border-radius: 18px;
            word-wrap: break-word;
        }

        .chat-message.bot .message-bubble {
            background-color: var(--bg-light);
            color: var(--text-color);
        }

        .chat-message.user .message-bubble {
            background-color: var(--accent-color);
            color: white;
        }

        .chat-input {
            padding: 20px;
            border-top: 1px solid var(--border-color);
            display: flex;
            gap: 10px;
        }

        .chat-input input {
            flex: 1;
        }

        /* Voice Recording */
        .voice-controls {
            text-align: center;
            margin: 20px 0;
        }

        .recording-indicator {
            display: none;
            color: var(--error-color);
            font-weight: 500;
            margin-top: 10px;
        }

        .recording-indicator.active {
            display: block;
        }

        .recording-dot {
            display: inline-block;
            width: 8px;
            height: 8px;
            background-color: var(--error-color);
            border-radius: 50%;
            animation: pulse 1.5s infinite;
            margin-right: 8px;
        }

        @keyframes pulse {
            0% { opacity: 1; }
            50% { opacity: 0.3; }
            100% { opacity: 1; }
        }

        /* Grid Layout for Form Elements */
        .form-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .container {
                padding: 0 15px;
            }

            .header h1 {
                font-size: 1.5rem;
            }

            .nav-tabs {
                justify-content: flex-start;
                overflow-x: auto;
                padding: 10px 0;
            }

            .tab-button {
                white-space: nowrap;
                flex-shrink: 0;
            }

            .tool-header h2 {
                font-size: 2rem;
            }

            .message-bubble {
                max-width: 90%;
            }

            .chat-container {
                height: 350px;
            }
        }

        /* Utility Classes */
        .text-center { text-align: center; }
        .text-left { text-align: left; }
        .text-right { text-align: right; }
        .mb-20 { margin-bottom: 20px; }
        .mb-30 { margin-bottom: 30px; }
        .mt-20 { margin-top: 20px; }
        .mt-30 { margin-top: 30px; }
        .hidden { display: none; }
        .flex { display: flex; }
        .gap-10 { gap: 10px; }
        .gap-15 { gap: 15px; }
        .items-center { align-items: center; }
        .justify-center { justify-content: center; }