* {
            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;
            padding: 20px;
        }
        
        .container {
            max-width: 900px;
            margin: 0 auto;
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 40px rgba(0,0,0,0.2);
            padding: 30px;
        }
        
        h1 {
            color: #333;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .back-link {
            color: #667eea;
            text-decoration: none;
            margin-bottom: 20px;
            display: inline-block;
        }
        
        .back-link:hover {
            text-decoration: underline;
        }
        
        .settings-form {
            display: grid;
            gap: 20px;
        }
        
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        
        label {
            font-weight: 600;
            color: #555;
            font-size: 14px;
        }
        
        .label-hint {
            font-size: 12px;
            color: #888;
            font-weight: normal;
        }
        
        input, select {
            padding: 12px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 14px;
            transition: border-color 0.3s;
        }
        
        input:focus, select:focus {
            outline: none;
            border-color: #667eea;
        }
        
        .sensitive-input {
            position: relative;
        }
        
        .show-password {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: #667eea;
            cursor: pointer;
            font-size: 12px;
        }
        
        .error-message {
            color: #e74c3c;
            font-size: 12px;
            margin-top: 5px;
        }
        
        .save-btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            margin-top: 10px;
        }
        
        .save-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
        }
        
        .save-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }
        
        .save-all-btn {
            width: 100%;
            margin-top: 20px;
        }
        
        .alert {
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            display: none;
        }
        
        .alert.success {
            background: #d4edda;
            color: #155724;
            border: 1px solid #c3e6cb;
        }
        
        .alert.error {
            background: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }
        
        .section {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 20px;
        }
        
        .section-title {
            font-size: 18px;
            font-weight: 600;
            color: #333;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #667eea;
        }
        
        .loading {
            text-align: center;
            padding: 20px;
            color: #666;
        }