body { font-family: Arial,sans-serif; margin:0; padding:0; background:#fefefe; color:#1b2a41;}
header {display:flex; justify-content:space-between; align-items:center; padding:1em 2em; background:#e0f7fa;}
header .logo {font-weight:bold; font-size:1.5em;}
header nav a {margin-left:1.5em; text-decoration:none; color:#1b2a41; font-weight:bold;}
main {padding:2em;}
.card {border:1px solid #ccc; border-radius:6px; padding:1em; margin:1em 0; background:white;}
.grid {display:flex; gap:1em; flex-wrap:wrap;}
.grid .card {flex:1 1 200px;}
.btn {background:#1b2a41;color:white;padding:0.5em 1em;text-decoration:none;border-radius:4px; cursor:pointer;}
table {width:100%; border-collapse:collapse; margin-top:1em;}
table, th, td {border:1px solid #ccc;}
th, td {padding:0.5em; text-align:center;}
input, select {padding:0.5em; margin:0.5em 0;}