* {
            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: 1000px;
            margin: 0 auto;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 20px;
            padding: 30px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
        }

        h1 {
            text-align: center;
            color: #2c3e50;
            margin-bottom: 30px;
            font-size: 2.5em;
            background: linear-gradient(45deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            body {
                padding: 10px;
            }
            
            .container {
                padding: 20px;
                border-radius: 15px;
            }
            
            h1 {
                font-size: 1.8em;
                margin-bottom: 20px;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 15px;
                border-radius: 10px;
            }
            
            h1 {
                font-size: 1.5em;
                line-height: 1.2;
            }
        }

        .search-section {
            background: #f8f9fa;
            padding: 30px;
            border-radius: 15px;
            margin-bottom: 30px;
            border: 2px solid #e9ecef;
        }

        .input-group {
            display: flex;
            gap: 15px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        input[type="text"] {
            flex: 1;
            padding: 15px;
            border: 2px solid #ddd;
            border-radius: 10px;
            font-size: 16px;
            min-width: 300px;
            transition: border-color 0.3s;
        }

        input[type="text"]:focus {
            outline: none;
            border-color: #667eea;
        }

        button {
            padding: 15px 30px;
            background: linear-gradient(45deg, #667eea, #764ba2);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 16px;
            cursor: pointer;
            transition: transform 0.2s;
            min-width: 150px;
        }

        button:hover {
            transform: translateY(-2px);
        }

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

        .email-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .email-provider {
            background: white;
            border-radius: 15px;
            padding: 25px;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            border-left: 5px solid #667eea;
            transition: all 0.3s;
        }

        /* Mobile Grid */
        @media (max-width: 768px) {
            .email-grid {
                grid-template-columns: 1fr;
                gap: 15px;
                margin-top: 20px;
            }
            
            .email-provider {
                padding: 20px;
                border-radius: 12px;
            }
        }

        @media (max-width: 480px) {
            .email-provider {
                padding: 15px;
                border-radius: 10px;
            }
        }

        .email-provider.found {
            border-left-color: #28a745;
            background: #f8fff9;
        }

        .email-provider.not-found {
            border-left-color: #dc3545;
            background: #fff8f8;
        }

        .email-provider.checking {
            border-left-color: #ffc107;
            background: #fffef7;
        }

        .email-provider.error {
            border-left-color: #6c757d;
            background: #f8f9fa;
        }

        .provider-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
        }

        .provider-name {
            font-size: 20px;
            font-weight: 600;
            color: #2c3e50;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .provider-logo {
            font-size: 24px;
        }

        .status-badge {
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* Mobile Provider Header */
        @media (max-width: 768px) {
            .provider-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
                margin-bottom: 12px;
            }
            
            .provider-name {
                font-size: 18px;
                width: 100%;
            }
            
            .status-badge {
                align-self: flex-end;
                padding: 6px 12px;
                font-size: 13px;
            }
        }

        @media (max-width: 480px) {
            .provider-header {
                gap: 8px;
            }
            
            .provider-name {
                font-size: 16px;
            }
            
            .provider-logo {
                font-size: 20px;
            }
            
            .status-badge {
                padding: 5px 10px;
                font-size: 12px;
            }
        }

        .status-badge.found {
            background: #28a745;
            color: white;
        }

        .status-badge.not-found {
            background: #dc3545;
            color: white;
        }

        .status-badge.checking {
            background: #ffc107;
            color: #212529;
        }

        .status-badge.error {
            background: #6c757d;
            color: white;
        }

        .email-details {
            margin-bottom: 15px;
        }

        .email-address {
            font-size: 18px;
            font-weight: 500;
            color: #495057;
            margin-bottom: 8px;
            word-break: break-all;
        }

        .check-method {
            font-size: 14px;
            color: #6c757d;
            margin-bottom: 10px;
        }

        .verification-info {
            background: #f1f3f4;
            padding: 12px;
            border-radius: 8px;
            font-size: 13px;
            color: #5f6368;
        }

        .action-buttons {
            display: flex;
            gap: 10px;
            margin-top: 15px;
        }

        .btn-small {
            padding: 8px 16px;
            font-size: 14px;
            border-radius: 6px;
            text-decoration: none;
            transition: all 0.3s;
            text-align: center;
            flex: 1;
        }

        /* Mobile Email Details */
        @media (max-width: 768px) {
            .email-address {
                font-size: 16px;
                margin-bottom: 6px;
            }
            
            .check-method {
                font-size: 13px;
                margin-bottom: 8px;
            }
            
            .verification-info {
                padding: 10px;
                font-size: 12px;
            }
            
            .action-buttons {
                flex-direction: column;
                gap: 8px;
                margin-top: 12px;
            }
            
            .btn-small {
                padding: 10px 16px;
                font-size: 14px;
                flex: none;
            }
        }

        @media (max-width: 480px) {
            .email-address {
                font-size: 15px;
            }
            
            .check-method {
                font-size: 12px;
            }
            
            .verification-info {
                padding: 8px;
                font-size: 11px;
            }
            
            .btn-small {
                padding: 8px 12px;
                font-size: 13px;
            }
        }

        .btn-verify {
            background: #17a2b8;
            color: white;
        }

        .btn-verify:hover {
            background: #138496;
        }

        .btn-signup {
            background: #28a745;
            color: white;
        }

        .btn-signup:hover {
            background: #218838;
        }

        .summary {
            background: linear-gradient(45deg, #667eea, #764ba2);
            color: white;
            padding: 25px;
            border-radius: 15px;
            margin-bottom: 20px;
            text-align: center;
        }

        .summary-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
            gap: 15px;
            margin-top: 15px;
        }

        .stat {
            background: rgba(255, 255, 255, 0.2);
            padding: 15px;
            border-radius: 10px;
            text-align: center;
        }

        .stat-number {
            font-size: 28px;
            font-weight: bold;
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 14px;
            opacity: 0.9;
        }

        /* Mobile Summary */
        @media (max-width: 768px) {
            .summary {
                padding: 20px;
                margin-bottom: 15px;
            }
            
            .summary h3 {
                font-size: 1.2em;
                margin-bottom: 10px;
            }
            
            .summary-stats {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
                margin-top: 12px;
            }
            
            .stat {
                padding: 12px;
            }
            
            .stat-number {
                font-size: 24px;
                margin-bottom: 3px;
            }
            
            .stat-label {
                font-size: 13px;
            }
        }

        @media (max-width: 480px) {
            .summary {
                padding: 15px;
            }
            
            .summary h3 {
                font-size: 1.1em;
                line-height: 1.3;
            }
            
            .summary-stats {
                gap: 10px;
            }
            
            .stat {
                padding: 10px;
            }
            
            .stat-number {
                font-size: 20px;
            }
            
            .stat-label {
                font-size: 12px;
            }
        }

        .spinner {
            width: 16px;
            height: 16px;
            border: 2px solid transparent;
            border-top: 2px solid currentColor;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

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

        .progress {
            width: 100%;
            height: 8px;
            background: #e9ecef;
            border-radius: 4px;
            margin: 15px 0;
            overflow: hidden;
        }

        .progress-bar {
            height: 100%;
            background: linear-gradient(45deg, #28a745, #20c997);
            width: 0%;
            transition: width 0.3s;
        }

        .hidden {
            display: none;
        }

        .warning {
            background: #fff3cd;
            border: 1px solid #ffeaa7;
            color: #856404;
            padding: 15px;
            border-radius: 10px;
            margin-bottom: 20px;
        }

        .tip {
            background: #d1ecf1;
            border: 1px solid #bee5eb;
            color: #0c5460;
            padding: 15px;
            border-radius: 10px;
            margin-top: 20px;
        }

        /* Mobile Warnings and Tips */
        @media (max-width: 768px) {
            .warning, .tip {
                padding: 12px;
                margin-bottom: 15px;
                font-size: 14px;
            }
            
            .tip {
                margin-top: 15px;
            }
        }

        @media (max-width: 480px) {
            .warning, .tip {
                padding: 10px;
                font-size: 13px;
                line-height: 1.4;
            }
        }

        /* Touch targets for mobile */
        @media (max-width: 768px) {
            button, .btn-small {
                min-height: 44px; /* Apple's recommended touch target size */
            }
        }
        
        .footer {
            margin-top: 40px;
            padding: 20px;
            text-align: center;
            color: #ffffff;
            background: linear-gradient(45deg, #667eea, #764ba2);
            border-radius: 15px;
            font-size: 14px;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }