*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#f8f9fa}.container{max-width:1200px;margin:0 auto;padding:20px}.header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:40px 20px;text-align:center}.header h1{font-size:3rem;margin-bottom:10px}.header p{font-size:1.5rem;opacity:.9}.nav{background:#fff;padding:15px 20px;box-shadow:0 2px 4px #0000001a;display:flex;justify-content:space-between;align-items:center}.nav-brand{font-size:1.5rem;font-weight:700;color:#667eea;text-decoration:none}.nav-links{display:flex;gap:20px}.nav-link{color:#333;text-decoration:none;font-weight:500}.nav-link:hover{color:#667eea}.btn{padding:12px 30px;font-size:1rem;border:none;border-radius:8px;cursor:pointer;font-weight:600;transition:all .3s}.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.btn-secondary{background:#fff;color:#667eea;border:2px solid #667eea}.btn-secondary:hover{background:#667eea;color:#fff}.card{background:#fff;border-radius:12px;padding:30px;box-shadow:0 4px 6px #0000001a;margin-bottom:20px}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-weight:600;color:#333}.form-group input{width:100%;padding:12px;border:2px solid #e0e0e0;border-radius:8px;font-size:1rem}.form-group input:focus{outline:none;border-color:#667eea}.upload-area{border:3px dashed #667eea;border-radius:12px;padding:40px;text-align:center;cursor:pointer;transition:all .3s}.upload-area:hover{background:#f0f4ff}.preview-image{max-width:100%;max-height:400px;border-radius:8px;margin-top:20px}.qr-code-container{text-align:center;padding:20px;background:#f8f9fa;border-radius:12px}.door-view{display:flex;justify-content:center;align-items:center;min-height:100vh;background:#000;padding:20px}.door-view img{max-width:100%;max-height:100vh;object-fit:contain}.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:30px;margin:40px 0}.step{text-align:center;padding:20px}.step-number{width:60px;height:60px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700;margin:0 auto 20px}.step h3{margin-bottom:10px;color:#333}.step p{color:#666;line-height:1.6}@media (max-width: 768px){.header h1{font-size:2rem}.header p{font-size:1.2rem}.nav{flex-direction:column;gap:15px}}