body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f5f7fb;
  color: #1f2937;
}

header {
  background: #0f172a;
  color: #fff;
  padding: 12px 20px;
}

nav a {
  color: #fff;
  margin-right: 16px;
  text-decoration: none;
}

main {
  padding: 20px;
}

.card {
  background: #fff;
  border: 1px solid #dbe1ea;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  border-bottom: 1px solid #e5e7eb;
  padding: 8px;
  text-align: left;
}

input,
select,
button,
textarea {
  padding: 8px;
  margin: 4px 0;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
}

button {
  background: #1d4ed8;
  color: #fff;
  border: none;
  cursor: pointer;
}

.muted {
  color: #64748b;
}