body { font-family: Arial, sans-serif; margin: 20px; }
.flash { padding: 10px; margin: 10px 0; }
.flash.success { background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.flash.warning { background-color: #fff3cd; color: #856404; border: 1px solid #ffeeba; }
.flash.info { background-color: #d1ecf1; color: #0c5460; border: 1px solid #bee5eb; }
nav a { margin: 0 5px; }
.btn { display: inline-block; padding: 5px 10px; background: #007bff; color: white; text-decoration: none; border-radius: 3px; }
table { border-collapse: collapse; width: 100%; }
th, td { padding: 8px; text-align: left; border-bottom: 1px solid #ddd; }