.html-tester-container{max-width:1400px;margin:0 auto;padding:20px;font-family:Arial,sans-serif;background-color:#f5f7fa;min-height:100vh}.html-tester-container .header{text-align:center;margin-bottom:40px}.html-tester-container .header h1{font-size:2.5rem;color:#1a202c;margin-bottom:10px}.html-tester-container .header p{font-size:1.1rem;color:#4a5568}.html-tester-container .tester-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}@media(max-width:1024px){.html-tester-container .tester-grid{grid-template-columns:1fr}}.html-tester-container .editor-section h2{font-size:1.5rem;color:#2d3748;margin-bottom:15px}.html-tester-container .editor-section .html-editor{width:100%;min-height:500px;border:1px solid #e2e8f0;border-radius:8px;padding:15px;font-family:Courier New,monospace;font-size:1rem;resize:vertical;background-color:#fff;box-shadow:0 2px 4px rgba(0,0,0,.1);transition:border-color .3s}.html-tester-container .editor-section .html-editor:focus{outline:none;border-color:#3182ce}.html-tester-container .preview-section .device-controls{margin-bottom:20px}.html-tester-container .preview-section .device-controls .device-buttons{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:15px}.html-tester-container .preview-section .device-controls .device-buttons .device-btn{padding:10px 20px;border:1px solid #e2e8f0;border-radius:6px;background-color:#fff;cursor:pointer;font-size:1rem;transition:all .3s}.html-tester-container .preview-section .device-controls .device-buttons .device-btn:hover{background-color:#edf2f7}.html-tester-container .preview-section .device-controls .device-buttons .device-btn.active{background-color:#3182ce;color:#fff;border-color:#3182ce}.html-tester-container .preview-section .device-controls .custom-size-inputs{display:flex;gap:20px}.html-tester-container .preview-section .device-controls .custom-size-inputs label{display:flex;align-items:center;gap:10px;font-size:1rem;color:#2d3748}.html-tester-container .preview-section .device-controls .custom-size-inputs label input{width:100px;padding:8px;border:1px solid #e2e8f0;border-radius:6px;font-size:1rem}.html-tester-container .preview-section .device-controls .custom-size-inputs label input:disabled{background-color:#edf2f7;cursor:not-allowed}.html-tester-container .preview-section .preview-wrapper{position:relative;background-color:#fff;border:1px solid #e2e8f0;border-radius:8px;padding:15px;box-shadow:0 2px 4px rgba(0,0,0,.1);display:flex;justify-content:center;align-items:center}.html-tester-container .preview-section .preview-wrapper .preview-iframe{border:none;background-color:#fff;transform-origin:top left;transition:all .3s}.html-tester-container .preview-section .preview-wrapper .size-indicator{position:absolute;bottom:10px;right:10px;background-color:rgba(0,0,0,.7);color:#fff;padding:5px 10px;border-radius:4px;font-size:.9rem}@media(max-width:768px){.html-tester-container{padding:15px}.html-tester-container .header h1{font-size:2rem}.html-tester-container .header p{font-size:1rem}.html-tester-container .editor-section .html-editor{min-height:300px}.html-tester-container .preview-section .device-controls .device-buttons{gap:8px}.html-tester-container .preview-section .device-controls .device-buttons .device-btn{padding:8px 15px;font-size:.9rem}.html-tester-container .preview-section .device-controls .custom-size-inputs{flex-direction:column;gap:10px}.html-tester-container .preview-section .device-controls .custom-size-inputs label input{width:100%}}