body{font-family:Arial,sans-serif;margin:0;background:#f5f7fa;color:#1f2937}
header{background:#0f766e;color:white;padding:18px 24px;display:flex;justify-content:space-between}
nav{padding:10px;background:white;border-bottom:1px solid #ddd}
button{padding:9px 12px;margin:4px;border:0;border-radius:6px;background:#0f766e;color:white;cursor:pointer}
main{padding:20px}
.card{background:white;border-radius:10px;padding:18px;margin-bottom:18px;box-shadow:0 2px 8px #0001}
input,select{padding:8px;margin:4px;border:1px solid #ccc;border-radius:5px}
table{width:100%;border-collapse:collapse;background:white}
th,td{border-bottom:1px solid #eee;padding:8px;text-align:left}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:8px}
.total{font-size:24px;font-weight:bold}