:root {
  --bg: #f6f8fa;
  --card: #fff;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #3d5a6c;
  --border: #e5e7eb;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "Noto Sans JP", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}
.wrap { max-width: 880px; margin: 0 auto; padding: 1.5rem 1.25rem 3rem; }
header.site {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
header.site img { width: 56px; height: 56px; border-radius: 12px; object-fit: cover; }
.logo-fallback {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  flex-shrink: 0;
}
header.site h1 { margin: 0; font-size: 1.35rem; font-weight: 700; }
nav.top {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}
nav.top a { color: var(--accent); text-decoration: none; }
nav.top a:hover { text-decoration: underline; }
.lang-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 1.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.9rem;
}
.lang-bar a { color: var(--accent); text-decoration: none; }
.lang-bar a:hover { text-decoration: underline; }
.lang-bar span { color: var(--muted); }
section.lang-block {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.35rem;
  margin-bottom: 1.25rem;
  scroll-margin-top: 1rem;
}
section.lang-block h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.5rem;
}
section.lang-block p { margin: 0.65rem 0; }
section.lang-block ul { margin: 0.5rem 0; padding-left: 1.25rem; }
footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}