* {
            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;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .container {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            padding: 40px;
            width: 100%;
            max-width: 800px;
            animation: slideIn 0.5s ease-out;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

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

        .logo-container {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
            margin-bottom: 10px;
        }

        .logo {
            width: 240px;
            height: 240px;
            border-radius: 10%;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease;
        }

        .logo:hover {
            transform: scale(1.05);
        }

        .header h1 {
            color: #333;
            font-size: 2.5rem;
            margin-bottom: 10px;
            background: linear-gradient(135deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .header p {
            color: #666;
            font-size: 1.1rem;
        }

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

        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #333;
        }

        .webhook-input {
            width: 100%;
            padding: 12px;
            border: 2px solid #e1e5e9;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s ease;
            background: #f8f9fa;
        }

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

        .message-input {
            width: 100%;
            min-height: 120px;
            padding: 15px;
            border: 2px solid #e1e5e9;
            border-radius: 10px;
            font-size: 1rem;
            font-family: inherit;
            resize: vertical;
            transition: all 0.3s ease;
            background: #f8f9fa;
        }

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

        .send-button {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            border: none;
            padding: 15px 40px;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .send-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
        }

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

        .send-button:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .loading-spinner {
            display: none;
            width: 20px;
            height: 20px;
            border: 2px solid transparent;
            border-top: 2px solid white;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-right: 10px;
        }

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

        .response-section {
            margin-top: 30px;
        }

        .response-container {
            background: #f8f9fa;
            border: 2px solid #e1e5e9;
            border-radius: 10px;
            padding: 20px;
            min-height: 100px;
            display: none;
            animation: fadeIn 0.5s ease-out;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .response-header {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 1px solid #e1e5e9;
            display: none;
        }

        .response-status {
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-right: 15px;
        }

        .status-success {
            background: #d4edda;
            color: #155724;
        }

        .status-error {
            background: #f8d7da;
            color: #721c24;
        }

        .response-time {
            color: #666;
            font-size: 0.9rem;
        }

        .response-content {
            white-space: pre-wrap;
            line-height: 1.6;
            color: #333;
            font-family: 'Courier New', monospace;
            background: #f8f9fa;
            border: 1px solid #e9ecef;
            border-radius: 8px;
            padding: 15px;
            overflow-x: auto;
        }

        .json-formatted {
            background: #2d3748;
            color: #e2e8f0;
            border: 1px solid #4a5568;
        }

        .json-key {
            color: #63b3ed;
        }

        .json-string {
            color: #68d391;
        }

        .json-number {
            color: #f6ad55;
        }

        .json-boolean {
            color: #fc8181;
        }

        .json-null {
            color: #a0aec0;
        }

        .file-upload-container {
            position: relative;
        }

        .file-input {
            position: absolute;
            opacity: 0;
            width: 100%;
            height: 100%;
            cursor: pointer;
            z-index: 2;
        }

        .file-upload-display {
            border: 2px dashed #cbd5e0;
            border-radius: 10px;
            padding: 30px;
            text-align: center;
            background: #f7fafc;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .file-upload-display:hover {
            border-color: #667eea;
            background: #edf2f7;
        }

        .file-upload-display.drag-over {
            border-color: #667eea;
            background: #e6fffa;
            transform: scale(1.02);
        }

        .file-upload-icon {
            font-size: 2.5rem;
            margin-bottom: 10px;
        }

        .file-upload-text {
            display: flex;
            flex-direction: column;
            gap: 5px;
        }

        .file-upload-main {
            font-weight: 600;
            color: #4a5568;
        }

        .file-upload-sub {
            font-size: 0.9rem;
            color: #718096;
        }

        .file-info {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: #e6fffa;
            border: 2px solid #38b2ac;
            border-radius: 10px;
            padding: 15px;
            margin-top: 10px;
        }

        .file-details {
            display: flex;
            flex-direction: column;
            gap: 5px;
        }

        .file-name {
            font-weight: 600;
            color: #2d3748;
        }

        .file-size {
            font-size: 0.9rem;
            color: #4a5568;
        }

        .remove-file-btn {
            background: #fed7d7;
            color: #c53030;
            border: none;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.2s ease;
        }

        .remove-file-btn:hover {
            background: #feb2b2;
            transform: scale(1.1);
        }

        .error-message {
            color: #dc3545;
            background: #f8d7da;
            border: 1px solid #f5c6cb;
            border-radius: 8px;
            padding: 15px;
            margin-top: 15px;
        }

        .success-message {
            color: #155724;
            background: #d4edda;
            border: 1px solid #c3e6cb;
            border-radius: 8px;
            padding: 15px;
            margin-top: 15px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 20px;
                margin: 10px;
            }
            
            .header h1 {
                font-size: 2rem;
            }
            
            .send-button {
                width: 100%;
            }
        }