* { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%); min-height: 100vh; color: #2d3748; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 20px 0; box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); position: sticky; top: 0; z-index: 100; }
        .header-content { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 15px; }
        .logo { font-size: 24px; font-weight: 700; text-decoration: none; color: white; display: flex; align-items: center; gap: 10px; }
        nav ul { display: flex; list-style: none; gap: 25px; }
        nav a { color: white; text-decoration: none; font-weight: 600; display: flex; align-items: center; gap: 5px; }
        .breadcrumb { background: white; padding: 15px 0; border-bottom: 1px solid #e2e8f0; }
        .breadcrumb-list { display: flex; align-items: center; gap: 10px; list-style: none; margin: 0; padding: 0; font-size: 14px; color: #718096; }
        .breadcrumb-list li { display: flex; align-items: center; }
        .breadcrumb-list a { color: #667eea; text-decoration: none; }
        .breadcrumb-list li::after { content: '/'; margin-left: 10px; color: #cbd5e0; }
        .breadcrumb-list li:last-child::after { display: none; }
        .main-content { padding: 40px 0; }
        .tool-section { background: white; border-radius: 20px; padding: 40px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08); margin-bottom: 40px; }
        .tool-header { text-align: center; margin-bottom: 40px; }
        .tool-header h1 { font-size: 32px; color: #2d3748; margin-bottom: 10px; }
        .tool-header h1 i { color: #667eea; margin-right: 10px; }
        .tool-header p { color: #718096; font-size: 16px; }
        .qrcode-area { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
        .input-section h3, .output-section h3 { font-size: 18px; color: #2d3748; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
        .input-section h3 i, .output-section h3 i { color: #667eea; }
        .type-tabs { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
        .type-tab { padding: 10px 20px; background: #f7fafc; border: 2px solid #e2e8f0; border-radius: 10px; cursor: pointer; transition: all 0.3s; font-size: 14px; }
        .type-tab:hover { border-color: #667eea; }
        .type-tab.active { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; border-color: transparent; }
        .form-group { margin-bottom: 20px; }
        .form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: #2d3748; }
        .form-group input, .form-group textarea, .form-group select { width: 100%; padding: 14px 18px; font-size: 16px; border: 2px solid #e2e8f0; border-radius: 12px; transition: all 0.3s; }
        .form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: #667eea; box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1); }
        .form-group textarea { min-height: 120px; resize: vertical; }
        .form-row { display: flex; gap: 15px; }
        .form-row .form-group { flex: 1; }
        .generate-btn { width: 100%; padding: 16px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; border: none; border-radius: 12px; font-size: 16px; font-weight: 600; cursor: pointer; transition: all 0.3s; }
        .generate-btn:hover { transform: translateY(-2px); box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4); }
        .qrcode-output { display: flex; flex-direction: column; align-items: center; }
        .qrcode-container { background: white; padding: 20px; border-radius: 15px; box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1); margin-bottom: 20px; }
        #qrcodeCanvas { width: 200px; height: 200px; }
        .qrcode-actions { display: flex; gap: 15px; }
        .qrcode-actions button { padding: 12px 24px; background: #f7fafc; border: 2px solid #e2e8f0; border-radius: 10px; cursor: pointer; transition: all 0.3s; display: flex; align-items: center; gap: 8px; }
        .qrcode-actions button:hover { background: #edf2f7; border-color: #667eea; }
        .info-section { background: white; border-radius: 15px; padding: 30px; box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05); }
        .info-section h2 { font-size: 20px; color: #2d3748; margin-bottom: 20px; display: flex; align-items: center; gap: 10px; }
        .info-section h2 i { color: #667eea; }
        .info-section p { color: #4a5568; margin-bottom: 15px; line-height: 1.8; }
        .info-section ul { margin-left: 20px; color: #4a5568; }
        .info-section li { margin-bottom: 10px; line-height: 1.8; }
        footer { background: #2d3748; color: #a0aec0; padding: 40px 0 20px; margin-top: 60px; }
        .footer-content { text-align: center; }
        .footer-links { display: flex; justify-content: center; gap: 20px; margin-bottom: 20px; flex-wrap: wrap; }
        .footer-links a { color: #a0aec0; text-decoration: none; }
        .copyright { font-size: 14px; color: #718096; }
        .hidden { display: none; }
        @media (max-width: 768px) {
            .header-content { flex-direction: column; text-align: center; }
            nav ul { flex-wrap: wrap; justify-content: center; }
            .tool-section { padding: 25px 15px; }
            .tool-header h1 { font-size: 24px; }
            .qrcode-area { grid-template-columns: 1fr; }
            .type-tabs { justify-content: center; }
            .form-row { flex-direction: column; }
        }