* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            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;
            font-size: 1.2rem;
        }

        .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;
            padding: 8px 12px;
            border-radius: 6px;
        }

        .nav-links a:hover {
            color: #3498db;
            background: rgba(52, 152, 219, 0.1);
        }

        .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;
        }

        /* QR Tools Navigation */
        .qr-tools-nav {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .qr-tool-card {
            background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
            border-radius: 15px;
            padding: 30px;
            text-align: center;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            border: 1px solid rgba(255,255,255,0.3);
        }

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

        .qr-tool-card i {
            font-size: 3em;
            margin-bottom: 15px;
            background: linear-gradient(135deg, #3498db, #2c3e50);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .qr-tool-card h3 {
            color: #2c3e50;
            margin-bottom: 10px;
            font-size: 1.3em;
        }

        .qr-tool-card p {
            color: #7f8c8d;
            margin-bottom: 20px;
        }

        .qr-tool-card .btn {
            display: inline-block;
            padding: 12px 25px;
            background: linear-gradient(135deg, #3498db, #2980b9);
            color: white;
            text-decoration: none;
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .qr-tool-card .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
        }

        /* Business Card QR Generator Section */
        .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(-5px);
            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;
        }

        .main-content {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
        }

        .form-container {
            flex: 1;
            min-width: 300px;
        }

        .preview-container {
            flex: 1;
            min-width: 300px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #444;
            font-size: 1rem;
        }

        input, select, textarea {
            width: 100%;
            padding: 14px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 16px;
            transition: all 0.3s;
            background: #f9f9f9;
        }

        input:focus, select:focus, textarea:focus {
            border-color: #3498db;
            outline: none;
            background: white;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
        }

        textarea {
            min-height: 80px;
            resize: vertical;
        }

        .color-picker {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-top: 8px;
        }

        .color-option {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            cursor: pointer;
            transition: all 0.3s;
            border: 3px solid white;
            box-shadow: 0 3px 8px rgba(0,0,0,0.1);
        }

        .color-option:hover {
            transform: scale(1.15);
        }

        .color-option.active {
            transform: scale(1.2);
            box-shadow: 0 0 0 3px #3498db, 0 5px 15px rgba(0,0,0,0.2);
        }

        button {
            background: linear-gradient(135deg, #3498db, #2980b9);
            color: white;
            border: none;
            padding: 16px 20px;
            font-size: 16px;
            font-weight: 600;
            border-radius: 10px;
            cursor: pointer;
            width: 100%;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin-top: 12px;
        }

        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
        }

        #qrcode {
            margin: 15px 0;
            padding: 20px;
            background: white;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            min-height: 250px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s;
            border: 1px solid #eee;
            width: 100%;
        }

        .download-btn {
            background: linear-gradient(135deg, #27ae60, #229954);
            margin-top: 15px;
        }

        .download-btn:hover {
            box-shadow: 0 5px 15px rgba(39, 174, 96, 0.4);
        }

        .reset-btn {
            background: linear-gradient(135deg, #e74c3c, #c0392b);
            margin-top: 10px;
        }

        .reset-btn:hover {
            box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
        }

        .loading {
            display: none;
            text-align: center;
            margin: 15px 0;
        }

        .loading span {
            display: inline-block;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #3498db;
            margin: 0 4px;
            animation: loading 1s infinite alternate;
        }

        .loading span:nth-child(2) {
            animation-delay: 0.2s;
        }

        .loading span:nth-child(3) {
            animation-delay: 0.4s;
        }

        @keyframes loading {
            0% { transform: translateY(0); opacity: 0.5; }
            100% { transform: translateY(-10px); opacity: 1; }
        }

        .success-message {
            background: #27ae60;
            color: white;
            padding: 12px;
            border-radius: 8px;
            text-align: center;
            margin-top: 15px;
            display: none;
            animation: fadeIn 0.5s ease;
        }

        .contact-preview {
            background: linear-gradient(to right, #f9f9f9, #f0f4ff);
            padding: 25px;
            border-radius: 12px;
            margin-top: 20px;
            border-left: 4px solid #3498db;
        }

        .contact-preview h3 {
            margin-bottom: 15px;
            color: #3498db;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .contact-info {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
            margin-top: 15px;
        }

        .info-item {
            background: white;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        .info-item strong {
            color: #2c3e50;
            display: block;
            margin-bottom: 5px;
            font-size: 0.9em;
        }

        .info-item span {
            color: #34495e;
            font-size: 0.95em;
        }

        .instructions {
            background: linear-gradient(to right, #f9f9f9, #f0f4ff);
            padding: 20px;
            border-radius: 12px;
            margin-top: 20px;
            border-left: 4px solid #3498db;
        }

        .instructions h3 {
            margin-bottom: 12px;
            color: #3498db;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .instructions ul {
            padding-left: 20px;
        }

        .instructions li {
            margin-bottom: 8px;
            line-height: 1.5;
        }

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

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