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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
            min-height: 100vh;
        }

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

        /* Header Navigation */
        .nav-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            padding: 15px 0;
            box-shadow: 0 2px 15px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: bold;
            color: #2c3e50;
            text-decoration: none;
        }

        .logo i {
            font-size: 1.5em;
            color: #3498db;
        }

        .nav-links {
            display: flex;
            gap: 20px;
        }

        .nav-links a {
            color: #2c3e50;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .nav-links a:hover {
            color: #3498db;
        }

        .header {
            background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
            padding: 40px;
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            text-align: center;
            margin-bottom: 30px;
            border: 1px solid rgba(255,255,255,0.2);
        }

        .header h1 {
            color: #2c3e50;
            font-size: 2.5em;
            margin-bottom: 15px;
            background: linear-gradient(135deg, #2c3e50, #3498db);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .header p {
            color: #7f8c8d;
            font-size: 1.2em;
            max-width: 600px;
            margin: 0 auto;
        }

        .card {
            background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
            border-radius: 20px;
            padding: 35px;
            margin-bottom: 30px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: all 0.3s ease;
            border: 1px solid rgba(255,255,255,0.3);
        }

        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
        }

        .card h2 {
            color: #2c3e50;
            border-bottom: 3px solid #3498db;
            padding-bottom: 15px;
            margin-bottom: 25px;
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.5em;
        }

        .card h2 i {
            font-size: 1.3em;
            background: linear-gradient(135deg, #3498db, #2c3e50);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* Support Buttons Section */
        .support-buttons {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            margin-top: 25px;
        }

        .support-btn {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            padding: 25px 20px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            text-decoration: none;
            border-radius: 15px;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .support-btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.2);
            color: white;
            text-decoration: none;
        }

        .support-btn i {
            font-size: 2.5em;
            margin-bottom: 15px;
            opacity: 0.9;
        }

        .support-btn .btn-title {
            font-size: 1.1em;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .support-btn .btn-desc {
            font-size: 0.9em;
            opacity: 0.9;
        }

        /* Different colors for each button */
        .support-btn.panel {
            background: linear-gradient(135deg, #3498db, #2980b9);
        }

        .support-btn.webmail {
            background: linear-gradient(135deg, #9b59b6, #8e44ad);
        }

        .support-btn.config {
            background: linear-gradient(135deg, #e74c3c, #c0392b);
        }

        .support-btn.status {
            background: linear-gradient(135deg, #27ae60, #229954);
        }

        .server-info {
            background: #f8f9fa;
            border-radius: 15px;
            padding: 25px;
            margin: 20px 0;
            border-left: 5px solid #3498db;
        }

        .config-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }

        .config-table th,
        .config-table td {
            padding: 15px 20px;
            text-align: left;
            border-bottom: 1px solid #e9ecef;
        }

        .config-table th {
            background: #3498db;
            color: white;
            font-weight: 600;
        }

        .config-table tr:nth-child(even) {
            background: #f8f9fa;
        }

        .config-table tr:hover {
            background: #e3f2fd;
        }

        .step {
            display: flex;
            align-items: flex-start;
            margin-bottom: 25px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: 12px;
            border-left: 5px solid #3498db;
            transition: all 0.3s ease;
        }

        .step:hover {
            background: #e3f2fd;
            transform: translateX(5px);
        }

        .step-number {
            background: #3498db;
            color: white;
            width: 35px;
            height: 35px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            margin-right: 20px;
            flex-shrink: 0;
            font-size: 1.1em;
            box-shadow: 0 3px 10px rgba(52, 152, 219, 0.3);
        }

        .code-block {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 18px;
            border-radius: 10px;
            font-family: 'Courier New', monospace;
            margin: 12px 0;
            overflow-x: auto;
            border-left: 4px solid #3498db;
        }

        .platform-tabs {
            display: flex;
            gap: 10px;
            margin-bottom: 25px;
            flex-wrap: wrap;
        }

        .tab {
            padding: 12px 25px;
            background: #ecf0f1;
            border: none;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
        }

        .tab.active {
            background: #3498db;
            color: white;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
            animation: fadeIn 0.5s ease;
        }

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

        .warning {
            background: #fff3cd;
            border: 1px solid #ffeaa7;
            border-left: 5px solid #f39c12;
            padding: 20px;
            border-radius: 10px;
            margin: 20px 0;
        }

        .success {
            background: #d1ecf1;
            border: 1px solid #bee5eb;
            border-left: 5px solid #17a2b8;
            padding: 20px;
            border-radius: 10px;
            margin: 20px 0;
        }

        .footer-card {
            text-align: center;
            background: linear-gradient(135deg, #2c3e50, #34495e);
            color: white;
            padding: 30px;
        }

        .footer-card p {
            margin-bottom: 10px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 15px;
            }
            
            .header {
                padding: 25px;
            }
            
            .header h1 {
                font-size: 2em;
            }
            
            .card {
                padding: 25px;
            }
            
            .platform-tabs {
                flex-direction: column;
            }
            
            .support-buttons {
                grid-template-columns: 1fr;
            }
            
            .nav-container {
                flex-direction: column;
                gap: 15px;
            }
            
            .nav-links {
                flex-wrap: wrap;
                justify-content: center;
            }
        }