:root {
  --text: #1f2933;
  --text-muted: #6b7280;
  --bg: #fafaf7;
  --card: #ffffff;
  --border: #e5e7eb;
  --accent: #2e5b7e;
  --accent-hover: #1d4060;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
  padding: 2.5rem 1.25rem;
  font-feature-settings: "palt";
}

.container {
  max-width: 720px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 3rem;
}

header h1 {
  font-size: 1.875rem;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

header .tagline {
  color: var(--text-muted);
  font-size: 0.95rem;
}

nav {
  text-align: center;
  margin: 2rem 0 3rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

nav a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  transition: background 0.15s;
}

nav a:hover {
  background: rgba(46, 91, 126, 0.08);
}

nav a[aria-current="page"] {
  font-weight: 600;
  background: rgba(46, 91, 126, 0.08);
}

main h2 {
  font-size: 1.375rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.02em;
}

main h3 {
  font-size: 1.075rem;
  margin: 2rem 0 0.75rem;
  color: var(--text);
}

main p {
  margin: 0.85rem 0;
}

main ul, main ol {
  margin: 0.85rem 0 0.85rem 1.5rem;
}

main li {
  margin: 0.4rem 0;
}

main a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

main a:hover {
  color: var(--accent-hover);
}

main strong {
  font-weight: 600;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem 1.75rem;
  margin: 1.5rem 0;
}

.card p:first-child { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }

.faq dt {
  font-weight: 600;
  margin-top: 1.5rem;
  color: var(--text);
}

.faq dd {
  margin: 0.5rem 0 0;
  color: var(--text);
}

footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer p {
  margin: 0.4rem 0;
}

@media (max-width: 480px) {
  body {
    padding: 2rem 1rem;
  }
  header h1 {
    font-size: 1.5rem;
  }
  main h2 {
    font-size: 1.2rem;
  }
}