*{margin:0;padding:0;box-sizing:border-box}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",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,.95);backdrop-filter:blur(10px);border-radius:20px;padding:40px;box-shadow:0 20px 40px rgba(0,0,0,.1)}
h1{text-align:center;color:#333;margin-bottom:30px;font-size:2.5rem;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-bottom:30px}
.form-section{background:#fff;padding:30px;border-radius:15px;box-shadow:0 10px 30px rgba(0,0,0,.1)}
.form-group{margin-bottom:20px}
label{display:block;margin-bottom:8px;font-weight:600;color:#555;font-size:14px;text-transform:uppercase;letter-spacing:1px}
input[type="text"],textarea,input[type="number"],input[type="range"],select{width:100%;padding:12px 15px;border:2px solid #e1e8ed;border-radius:10px;font-size:16px;transition:.3s;background:#f8f9fa}
input[type="text"]:focus,textarea:focus,input[type="number"]:focus,select:focus{outline:none;border-color:#667eea;background:#fff;box-shadow:0 0 0 3px rgba(102,126,234,.1)}
textarea{resize:vertical;min-height:80px}
.range-container{display:flex;align-items:center;gap:15px}
input[type="range"]{flex:1;height:6px;background:#e1e8ed;border-radius:3px;outline:none}
input[type="range"]::-webkit-slider-thumb{appearance:none;width:20px;height:20px;border-radius:50%;background:#667eea;cursor:pointer}
.range-value{background:#667eea;color:#fff;padding:5px 12px;border-radius:20px;font-weight:600;min-width:50px;text-align:center}
.color-input-group{display:grid;grid-template-columns:1fr 1fr;gap:15px}
input[type="color"]{width:100%;height:50px;border:none;border-radius:10px;cursor:pointer;background:none}
.btn-generate{width:100%;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;padding:15px 30px;border-radius:10px;font-size:18px;font-weight:600;cursor:pointer;transition:.3s;text-transform:uppercase;letter-spacing:1px}
.btn-generate:hover{transform:translateY(-2px);box-shadow:0 10px 20px rgba(102,126,234,.3)}
.qr-preview{text-align:center;background:#fff;padding:30px;border-radius:15px;box-shadow:0 10px 30px rgba(0,0,0,.1)}
.qr-container{display:inline-block;padding:20px;background:#fff;border-radius:10px;box-shadow:0 5px 15px rgba(0,0,0,.1);margin:20px 0}
#qrCanvas{max-width:100%;height:auto;border-radius:8px}
.download-section{margin-top:20px;display:flex;gap:15px;justify-content:center;flex-wrap:wrap}
.btn-download{background:#28a745;color:#fff;border:none;padding:12px 25px;border-radius:8px;font-weight:600;cursor:pointer;transition:.3s;text-decoration:none;display:inline-flex;align-items:center;gap:8px}
.btn-download:hover{background:#218838;transform:translateY(-2px);box-shadow:0 5px 15px rgba(40,167,69,.3)}
.info-text{color:#666;font-size:14px;margin-top:15px;text-align:center}
@media (max-width:768px){.form-grid{grid-template-columns:1fr}.container{padding:20px}h1{font-size:2rem}.download-section{flex-direction:column}}
.error-message{background:#f8d7da;color:#721c24;padding:12px 15px;border-radius:8px;margin:10px 0;border:1px solid #f5c6cb}
.success-message{background:#d4edda;color:#155724;padding:12px 15px;border-radius:8px;margin:10px 0;border:1px solid #c3e6cb}