/* style.css */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "Tahoma", sans-serif; background: #f5f5f5; }
.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
header { background: #2c3e50; color: white; padding: 20px; border-radius: 10px; margin-bottom: 20px; display: flex; justify-content: space-between; align-items: center; }
nav ul { list-style: none; display: flex; gap: 20px; }
nav ul li a { color: white; text-decoration: none; }
main { background: white; padding: 20px; border-radius: 10px; min-height: 500px; }
footer { text-align: center; padding: 20px; margin-top: 20px; background: #2c3e50; color: white; border-radius: 10px; }
table { width: 100%; border-collapse: collapse; margin: 15px 0; }
table th, table td { border: 1px solid #ddd; padding: 12px; text-align: right; }
table th { background: #34495e; color: white; }
input, select { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 5px; }
button { background: #3498db; color: white; padding: 10px 20px; border: none; border-radius: 5px; cursor: pointer; }
.alert { padding: 15px; margin: 15px 0; border-radius: 5px; }
.alert-success { background: #d4edda; color: #155724; }
.alert-error { background: #f8d7da; color: #721c24; }