* {
            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: #333;
            background-color: #ececec; 
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 1rem;
        }

        .intro-section {
            background: linear-gradient(135deg, #e8f4fd 0%, #d1ecf1 100%);
            border: 2px solid #1976d2;
            border-radius: 8px;
            padding: 1.75rem;
            margin-bottom: 2rem;
            box-shadow: 0 4px 15px rgba(25, 118, 210, 0.15);
        }

        .intro-section h2 {
            color: #0c5aa6;
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
        }

        .intro-icon {
            width: 20px;
            height: 20px;
            margin-right: 0.75rem;
            fill: currentColor;
        }

        .intro-section p {
            color: #0c5aa6;
            font-size: 0.95rem;
            line-height: 1.6;
            margin: 0;
        }

        .content-section {
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            padding: 2rem;
        }

        .section-header {
            display: flex;
            align-items: center;
            margin-bottom: 1.5rem;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid #e9ecef;
        }

        .security-badge {
            display: inline-flex;
            align-items: center;
            background: #e8f5e8;
            color: #2d6e2d;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.875rem;
            font-weight: 500;
            margin-right: 1rem;
            border: 1px solid #c3e6c3;
        }

        .security-icon {
            width: 16px;
            height: 16px;
            margin-right: 0.5rem;
            fill: currentColor;
        }

        h1 {
            color: #2c3e50;
            font-size: 1.5rem;
            font-weight: 600;
            margin: 0;
        }

        .protocol-tabs {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-bottom: 2rem;
        }

        .protocol-tab {
            background: #f8f9fa;
            border: 2px solid #e9ecef;
            border-radius: 6px;
            padding: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
        }

        .protocol-tab.active {
            background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
            border-color: #1976d2;
            box-shadow: 0 3px 10px rgba(25, 118, 210, 0.2);
            transform: translateY(-2px);
        }

        .protocol-tab h3 {
            color: #495057;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        .protocol-tab.active h3 {
            color: #1976d2;
            font-size: 1.1rem;
        }

        .protocol-tab.active h3::after {
            content: "";
            display: inline-block;
            width: 16px;
            height: 16px;
            margin-left: 0.5rem;
            background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%231976d2"><path d="M12,2A10,10 0 0,0 2,12A10,10 0 0,0 12,22A10,10 0 0,0 22,12A10,10 0 0,0 12,2M11,16.5L6.5,12L7.91,10.59L11,13.67L16.59,8.09L18,9.5L11,16.5Z"/></svg>');
            background-size: contain;
            background-repeat: no-repeat;
            vertical-align: middle;
        }

        .protocol-description {
            font-size: 0.85rem;
            color: #6c757d;
            line-height: 1.4;
        }

        .protocol-tab.active .protocol-description {
            color: #1565c0;
        }

        .config-table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 1.5rem;
        }

        .config-table th,
        .config-table td {
            padding: 0.875rem;
            text-align: left;
            border-bottom: 1px solid #e9ecef;
        }

        .config-table th {
            background-color: #f8f9fa;
            font-weight: 600;
            color: #495057;
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .config-table td {
            font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
            font-size: 0.9rem;
        }

        .config-table tr:hover {
            background-color: #f8f9fa;
        }

        .server-value {
            color: #0066cc;
            font-weight: 500;
        }

        .port-value {
            background: #e3f2fd;
            color: #1976d2;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            font-weight: 500;
        }

        .important-note {
            background: #fff3cd;
            border: 1px solid #ffeaa7;
            border-radius: 6px;
            padding: 1rem;
            margin-top: 1.5rem;
        }

        .important-note h3 {
            color: #856404;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .important-note p {
            color: #856404;
            font-size: 0.9rem;
            line-height: 1.5;
            margin: 0;
        }

        .grid-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
        }

        .single-column {
            grid-column: 1 / -1;
        }
        
        #imap {
            border: 2px solid #1976d2;
            border-radius: 8px;
        }

        @media (max-width: 768px) {
            .grid-layout {
                grid-template-columns: 1fr;
            }
            
            .protocol-tabs {
                grid-template-columns: 1fr;
            }
            
            .container {
                padding: 0 1rem;
            }
            
            .content-section {
                padding: 1.5rem;
            }
            
            .section-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 0.75rem;
            }
            
            .config-table {
                font-size: 0.85rem;
            }
            
            .config-table th,
            .config-table td {
                padding: 0.75rem 0.5rem;
            }
        }