body{margin:0;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}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.topnav{background:#3b5998;color:#fff;padding:10px 20px;display:flex;align-items:center}.logo{font-size:22px;font-weight:700;margin-right:40px}.nav-links a{color:#fff;margin-right:20px;text-decoration:none;font-size:16px}.nav-links a:hover{text-decoration:underline}.sidebar{width:200px;background:#fff;padding:20px;border-right:1px solid #ddd}.sidebar a{display:block;margin-bottom:15px;color:#3b5998;text-decoration:none;font-weight:700}.sidebar a:hover{text-decoration:underline}.login-container{display:flex;justify-content:center;margin-top:80px}.login-card{background:#fff;padding:30px;width:350px;border-radius:6px;box-shadow:0 1px 4px #0003;text-align:center}.login-card h2{margin-bottom:20px;color:#3b5998}.login-card input{width:100%;padding:12px;margin-bottom:15px;border:1px solid #ddd;border-radius:4px}.login-card button{width:100%;padding:12px;background:#3b5998;color:#fff;border:none;border-radius:4px;font-size:16px}.login-card button:hover{background:#324b82}.error{background:#fdd;color:#a00;padding:10px;margin-bottom:15px;border-radius:4px}.card{background:#fff;padding:20px;border-radius:6px;margin-bottom:20px;box-shadow:0 1px 3px #0000001a}.layout{display:flex;margin-top:10px}.content{flex:1;padding:20px;background:#f0f2f5;min-height:100vh}