* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Poppins', sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
            color: #fff;
        }
        
        .error-container {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 60px 40px;
            text-align: center;
            max-width: 600px;
            width: 100%;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            border: 1px solid rgba(255, 255, 255, 0.2);
            animation: fadeIn 0.8s ease-out;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .error-code {
            font-size: 120px;
            font-weight: 700;
            color: #fff;
            text-shadow: 3px 3px 0 rgba(0, 0, 0, 0.1);
            margin-bottom: 10px;
            line-height: 1;
        }
        
        .error-title {
            font-size: 32px;
            font-weight: 600;
            margin-bottom: 20px;
            color: #fff;
        }
        
        .error-message {
            font-size: 18px;
            line-height: 1.6;
            margin-bottom: 30px;
            opacity: 0.9;
        }
        
        .error-icon {
            font-size: 80px;
            margin-bottom: 30px;
            color: #ffd166;
            animation: float 3s ease-in-out infinite;
        }
        
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-15px); }
        }
        
        .btn-group {
            display: flex;
            gap: 15px;
            justify-content: center;
            flex-wrap: wrap;
        }
        
        .btn {
            padding: 14px 30px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 500;
            font-size: 16px;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            border: none;
            cursor: pointer;
        }
        
        .btn-primary {
            background: linear-gradient(135deg, #ffd166 0%, #ff9e6d 100%);
            color: #333;
        }
        
        .btn-secondary {
            background: rgba(255, 255, 255, 0.2);
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.3);
        }
        
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }
        
        .btn-primary:hover {
            background: linear-gradient(135deg, #ffc745 0%, #ff8a4c 100%);
        }
        
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.3);
        }
        
        .logo {
            max-width: 180px;
            margin: 0 auto 30px;
            display: block;
            filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
        }
        
        .help-text {
            margin-top: 30px;
            font-size: 14px;
            opacity: 0.8;
            border-top: 1px solid rgba(255, 255, 255, 0.2);
            padding-top: 20px;
        }
        
        @media (max-width: 768px) {
            .error-container {
                padding: 40px 20px;
            }
            
            .error-code {
                font-size: 80px;
            }
            
            .error-title {
                font-size: 24px;
            }
            
            .btn-group {
                flex-direction: column;
            }
            
            .btn {
                width: 100%;
                justify-content: center;
            }
        }