:root {
  --navy: #1b3a6b;
  --navy-dark: #142c52;
  --text: #222;
  --muted: #666;
  --border: #e3e6ec;
  --bg-soft: #f5f7fa;
}

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

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic UI",
    "Yu Gothic", Meiryo, sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.8;
}

header {
  border-bottom: 3px solid var(--navy);
  background: #fff;
}

.header-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  text-decoration: none;
}

.site-subtitle {
  font-size: 0.85rem;
  color: var(--muted);
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

h1 {
  font-size: 1.6rem;
  color: var(--navy);
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.15rem;
  color: var(--navy);
  margin: 2rem 0 0.75rem;
  padding-left: 0.6rem;
  border-left: 4px solid var(--navy);
}

p {
  margin-bottom: 1rem;
}

ul {
  margin: 0 0 1rem 1.4rem;
}

li {
  margin-bottom: 0.4rem;
}

.lead {
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 1rem;
  color: var(--navy);
  margin-bottom: 0.5rem;
}

.card p:last-child,
.card ul:last-child {
  margin-bottom: 0;
}

a {
  color: var(--navy);
  text-decoration: underline;
}

a:hover {
  color: var(--navy-dark);
}

.contact-box {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.5rem;
  margin: 1rem 0;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

footer {
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

.footer-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.25rem;
  font-size: 0.85rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

footer a {
  color: var(--muted);
}