*{margin:0;padding:0;box-sizing:border-box}:root{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;min-width:320px;min-height:100vh}#root{min-height:100vh}.app{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:2rem;background:linear-gradient(135deg,#667eea,#764ba2)}.container{background:#fff;border-radius:20px;padding:3rem;max-width:600px;width:100%;box-shadow:0 20px 60px #0000004d}h1{margin:0 0 .5rem;color:#2d3748;font-size:2.5rem;font-weight:700}.subtitle{color:#718096;margin:0 0 2rem;font-size:1.1rem}.input-section{margin-bottom:2rem}.input-section label{display:block;text-align:left;margin-bottom:.5rem;color:#4a5568;font-weight:600;font-size:.9rem}.url-input{width:100%;padding:1rem;border:2px solid #e2e8f0;border-radius:10px;font-size:1rem;transition:all .3s ease;box-sizing:border-box}.url-input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.qr-section{animation:fadeIn .5s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.qr-display{background:#f7fafc;border-radius:15px;padding:2rem;margin-bottom:2rem;display:flex;justify-content:center;align-items:center}.qr-display canvas{border-radius:10px;box-shadow:0 4px 6px #0000001a}.controls{text-align:left}.control-group{margin-bottom:1.5rem}.control-group label{display:block;margin-bottom:.5rem;color:#4a5568;font-weight:600;font-size:.9rem}.slider{width:100%;height:8px;border-radius:5px;background:#e2e8f0;outline:none;-webkit-appearance:none}.slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:#667eea;cursor:pointer;transition:all .3s ease}.slider::-webkit-slider-thumb:hover{transform:scale(1.2);background:#5a67d8}.slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:#667eea;cursor:pointer;border:none;transition:all .3s ease}.slider::-moz-range-thumb:hover{transform:scale(1.2);background:#5a67d8}.color-controls{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1.5rem}.color-input{width:100%;height:50px;border:2px solid #e2e8f0;border-radius:8px;cursor:pointer;transition:all .3s ease}.color-input:hover{border-color:#667eea}.download-btn{width:100%;padding:1rem;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 6px #667eea4d}.download-btn:hover{transform:translateY(-2px);box-shadow:0 6px 12px #667eea66}.download-btn:active{transform:translateY(0)}.placeholder{text-align:center;padding:3rem 2rem;color:#a0aec0}.placeholder svg{margin-bottom:1rem;opacity:.5}.placeholder p{margin:0;font-size:1.1rem}@media(max-width:640px){.app{padding:1rem}.container{padding:2rem 1.5rem}h1{font-size:2rem}.color-controls{grid-template-columns:1fr}}