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

body {
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Meiryo", sans-serif;
  line-height: 1.8;
  color: #1a1a1a;
  background: #fafafa;
  padding: 0;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

h1 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.last-updated {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 40px;
}

h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid #e0e0e0;
}

h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 8px;
}

p {
  margin-bottom: 16px;
}

ul,
ol {
  margin-bottom: 16px;
  padding-left: 1.5em;
}

li {
  margin-bottom: 6px;
}

a {
  color: #2563eb;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.nav {
  text-align: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid #e0e0e0;
}

.nav a {
  margin: 0 12px;
}

/* index page */
.index-hero {
  text-align: center;
  padding: 80px 24px 40px;
}

.index-hero h1 {
  font-size: 2rem;
  margin-bottom: 8px;
}

.index-hero p {
  color: #666;
  margin-bottom: 32px;
}

.index-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.index-links a {
  display: block;
  padding: 20px 32px;
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  font-weight: 600;
  transition: box-shadow 0.15s;
}

.index-links a:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  text-decoration: none;
}