:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1a2233;
  --muted: #4b5568;
  --line: #d9dee7;
  --primary: #1e2f4d;
  --primary-soft: #e8eef8;
  --accent: #2d4a7a;
  --max-width: 1080px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible {
  outline: 3px solid #7aa2e6;
  outline-offset: 2px;
}

img { max-width: 100%; height: auto; }

.container {
  width: min(100% - 1.25rem, var(--max-width));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: 72px;
  padding-block: 0.45rem;
}

.brand {
  font-weight: 700;
  color: var(--primary);
  font-size: 0.95rem;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.nav-toggle {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: #fff;
  padding: 0.55rem 0.85rem;
  font-size: 0.95rem;
}

.site-nav {
  display: none;
  padding-bottom: 0.75rem;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.25rem;
}

.site-nav a {
  display: block;
  padding: 0.6rem;
  border-radius: 0.5rem;
  line-height: 1.5;
}

.site-nav a[aria-current="page"] {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
}

.site-nav.is-open { display: block; }

main { padding: 1.5rem 0 3rem; }

.section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.35rem;
  margin-bottom: 1rem;
}

.hero { padding: 1.6rem 1.35rem; }

h1, h2, h3 { line-height: 1.45; color: var(--primary); margin-top: 0; }
h1 { font-size: 1.42rem; }
h2 { font-size: 1.2rem; margin-bottom: 0.8rem; }

.lead { color: var(--muted); margin-bottom: 1.25rem; }

.grid { display: grid; gap: 0.85rem; }

.list-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  padding: 0.85rem 1rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.78rem 1.05rem;
  border-radius: 0.6rem;
  font-weight: 700;
  border: 1px solid var(--primary);
}

.button.primary {
  background: var(--primary);
  color: #fff;
}

.button.secondary {
  background: #fff;
  color: var(--primary);
}

.cta-box {
  background: #eef3fb;
  border-color: #c9d6ea;
  padding: 1.6rem;
}

.cta-box .button {
  margin-top: 0.5rem;
}

.note { color: var(--muted); font-size: 0.95rem; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0;
  background: #fff;
}

.footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 0.8rem 0;
  padding: 0;
  list-style: none;
}

dl { margin: 0; }
dt { font-weight: 700; margin-top: 0.65rem; }
dd { margin: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
}

th, td {
  border: 1px solid var(--line);
  padding: 0.65rem;
  text-align: left;
  vertical-align: top;
}

@media (max-width: 420px) {
  .button { width: 100%; }
}

@media (min-width: 860px) {
  .container { width: min(100% - 2rem, var(--max-width)); }
  .nav-toggle { display: none; }
  .site-nav { display: block; padding-bottom: 0; }
  .site-nav ul { display: flex; gap: 0.5rem; }
  .site-nav a { padding: 0.4rem 0.65rem; }

  .grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  .section, .hero, .cta-box { padding: 2rem; }
}