*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif}#root{min-height:100vh}.app-layout{flex-direction:column;min-height:100vh;display:flex}.navbar{color:#fff;background-color:#4682b4;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;padding:16px 24px;display:flex}.navbar-brand{align-items:center;gap:10px;display:flex}.navbar-brand h1{margin:0;font-size:1.2rem}.navbar-logo{font-size:1.5rem}.navbar-nav a{color:#fff;margin-left:16px;text-decoration:none}.navbar-nav a:hover{text-decoration:underline}.app-body{flex:1;gap:24px;padding:24px;display:flex}.sidebar{background-color:#f5f5f5;border:1px solid #d3d3d3;flex-shrink:0;flex-basis:220px;padding:16px}.sidebar h2{margin-top:0;font-size:1.1rem}.sidebar ul{padding-left:20px}.main-content{text-align:center;flex:1}.image-frame{background-color:#f5f5f5;border:1px solid #d3d3d3;justify-content:center;align-items:center;min-height:320px;margin:20px 0;display:flex}.image-frame img{max-width:100%;max-height:400px}.error{color:#dc143c}button{color:#fff;cursor:pointer;background-color:#4682b4;border:none;padding:10px 20px;font-size:1rem}button:hover{background-color:#483d8b}button:disabled{cursor:not-allowed;background-color:gray}.footer{text-align:center;background-color:#f5f5f5;border-top:1px solid #d3d3d3;padding:16px}.footer p{margin:4px 0}@media (width<=600px){.app-body{flex-direction:column}.sidebar{flex-basis:auto}}