body {
  font-family: "Noto Sans JP", system-ui, sans-serif;
  margin: 0;
  background: #f7f9fc;
}

header {
  background: #003f88;
  color: white;
  padding: 1.5em 2em;
}

header h1 {
  margin: 0;
}

header p {
  margin: 0.3em 0 0;
  opacity: 0.9;
}

.warning {
  background: #fff3cd;
  color: #856404;
  padding: 1em 2em;
  border-bottom: 1px solid #ffeeba;
  font-weight: bold;
}

.container {
  padding: 2em;
}

h2 {
  border-left: 6px solid #003f88;
  padding-left: 0.5em;
}

code {
  background: #eef;
  padding: 4px 6px;
  border-radius: 4px;
  display: inline-block;
}

table {
  border-collapse: collapse;
  width: 100%;
  background: white;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
  font-size: 13px;
}

th, td {
  border: 1px solid #ddd;
  padding: 6px 8px;
  vertical-align: top;
}

th {
  background: #e9f0f7;
  cursor: pointer;
  position: sticky;
  top: 0;
  z-index: 2;
}

tr:nth-child(even) {
  background: #f6f8fa;
}

a {
  color: #003f88;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  margin-top: 3em;
  padding: 1em;
  background: #003f88;
  color: white;
  text-align: center;
  font-size: 12px;
}