* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, sans-serif;
  margin: 0;
  background: #f4f6f8;
  color: #1a1a2e;
}
header {
  background: #1e3a5f;
  color: #fff;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header h1 { margin: 0; font-size: 1.25rem; }
main { max-width: 960px; margin: 2rem auto; padding: 0 1rem; }
.card {
  background: #fff;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
  margin-bottom: 1.5rem;
}
label { display: block; margin-bottom: .35rem; font-weight: 600; font-size: .9rem; }
input, select, button, textarea {
  font: inherit;
  padding: .5rem .75rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}
input[type="date"], input[type="password"], input[type="text"] { width: 100%; max-width: 280px; }
.row { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
.btn {
  background: #1e3a5f;
  color: #fff;
  border: none;
  cursor: pointer;
  padding: .6rem 1.2rem;
  border-radius: 4px;
}
.btn:hover { background: #2a5080; }
.btn-secondary { background: #6c757d; }
.btn-danger { background: #c0392b; }
.hidden { display: none !important; }
.error { color: #c0392b; margin-top: .5rem; }
.success { color: #27ae60; margin-top: .5rem; }
.unit-list { max-height: 160px; overflow-y: auto; border: 1px solid #ddd; padding: .5rem; border-radius: 4px; }
.unit-list label { font-weight: normal; display: flex; gap: .5rem; align-items: center; margin-bottom: .25rem; }
#chart-wrap { position: absolute; left: -9999px; width: 800px; height: 400px; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { border: 1px solid #ddd; padding: .4rem .6rem; text-align: left; }
th { background: #eef2f6; }
.nav a { color: #fff; margin-left: 1rem; }