body{font-family:Arial,sans-serif;background:#f4f7fb;margin:0}
header{background:#2563eb;color:#fff;padding:16px}
.container{max-width:900px;margin:30px auto;background:#fff;padding:24px;border-radius:10px;box-shadow:0 2px 8px rgba(0,0,0,.1)}
input,button{width:100%;padding:10px;margin:8px 0}
button{background:#2563eb;color:#fff;border:none;border-radius:6px;cursor:pointer}
nav a{margin-right:15px;text-decoration:none;color:#2563eb}
.card{display:inline-block;width:180px;padding:18px;margin:10px;background:#eef4ff;border-radius:8px;text-align:center}
table{width:100%;border-collapse:collapse}
td,th{border:1px solid #ddd;padding:8px}