:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --text: #1c1c1e;
  --muted: #6b6b70;
  --border: #e3e3e0;
  --accent: #2f6fed;
  --accent-text: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121214;
    --surface: #1c1c20;
    --text: #ececef;
    --muted: #9a9aa2;
    --border: #2c2c32;
    --accent: #6b9bff;
    --accent-text: #0b0b0d;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", Meiryo, sans-serif;
  line-height: 1.8;
}
a { color: var(--accent); }

.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }

header.site {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; padding-top: 14px; padding-bottom: 14px;
}
.logo { font-weight: 700; font-size: 1.2rem; color: var(--text); text-decoration: none; letter-spacing: .02em; }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: .95rem; }
nav a:first-child { margin-left: 0; }
nav a:hover { color: var(--text); }

.hero { padding: 72px 0 48px; }
.hero h1 { font-size: clamp(2rem, 6vw, 3rem); line-height: 1.2; margin: 0 0 12px; }
.hero p { color: var(--muted); margin: 0; font-size: 1.05rem; }

section { padding: 32px 0; }
h2 { font-size: 1.4rem; margin: 0 0 16px; }
h3 { font-size: 1.1rem; margin: 28px 0 8px; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px;
}
.card h3 { margin: 0 0 6px; }
.card p { margin: 0 0 12px; color: var(--muted); font-size: .95rem; }
.badge {
  display: inline-block; font-size: .8rem; padding: 2px 10px; border-radius: 999px;
  border: 1px solid var(--border); color: var(--muted);
}
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-text);
  padding: 10px 20px; border-radius: 8px; text-decoration: none; font-weight: 600;
}

.doc { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 28px 24px; margin: 32px 0; }
.doc h1 { font-size: 1.6rem; margin: 0 0 4px; }
.doc .updated { color: var(--muted); font-size: .9rem; margin: 0 0 24px; }

table.info { width: 100%; border-collapse: collapse; }
table.info th, table.info td { border-top: 1px solid var(--border); padding: 12px 8px; text-align: left; vertical-align: top; }
table.info th { width: 32%; font-weight: 600; }
@media (max-width: 560px) {
  table.info th, table.info td { display: block; width: 100%; }
  table.info td { border-top: none; padding-top: 0; }
}

footer.site { border-top: 1px solid var(--border); margin-top: 48px; padding: 24px 0; color: var(--muted); font-size: .9rem; }
footer.site nav a { margin-left: 0; margin-right: 16px; }