:root {
  --primary: #1a5276;
  --primary-light: #eaf2f8;
  --text: #2c3e50;
  --bg: #f8f9fa;
  --border: #d5dbdb;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
}
header {
  background: #fff;
  border-bottom: 3px solid var(--primary);
  padding: 1rem 2rem;
}
.site-title a {
  color: var(--primary);
  text-decoration: none;
  font-size: 1.5rem;
}
nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-top: 0.5rem;
}
nav a {
  display: block;
  padding: 0.4rem 1rem;
  color: var(--text);
  text-decoration: none;
  border-radius: 4px;
}
nav a:hover { background: var(--primary-light); }
nav a.active { background: var(--primary); color: #fff; }
main { max-width: 860px; margin: 2rem auto; padding: 0 1.5rem; }
.hero {
  background: #fff;
  border-left: 6px solid var(--primary);
  padding: 2rem;
  margin-bottom: 1.5rem;
}
.hero h2 { color: var(--primary); margin-bottom: 0.5rem; }
h3 {
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
  padding-bottom: 0.3rem;
  margin-bottom: 1rem;
}
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.grid .card p { margin-bottom: 0.5rem; }
.button {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  padding: 0.4rem 1.2rem;
  border-radius: 4px;
}
.button:hover { opacity: 0.85; }
table {
  border-collapse: collapse;
  width: 100%;
  max-width: 560px;
  margin: 0.5rem 0;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.9rem;
  text-align: left;
}
th { background: var(--primary-light); white-space: nowrap; }
main ul { margin: 0.5rem 0 1rem 1.5rem; }
main a { color: var(--primary); }
footer {
  text-align: center;
  padding: 1.5rem;
  color: #7f8c8d;
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}